• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    washing machine and control method comprising a heater, which heats the air, and a fan, which supplies the air to the tub, a washing machine and a control method for it are disclosed. the washing machine includes a cabinet (10); a bowl (100) attached to the cabinet (10); a drum (300) pivotally provided in the bowl (100); a dry duct (20) which heats the exhausted air from the bowl (100) to a predetermined temperature, to replenish the heated air to the bowl (100); condensing unit (170), which condenses moisture in at least a predetermined area of an internal circumferential surface of the tub (100) by exchanging heat from the external air of the cabinet (10) with at least the predetermined area of a circumferential surface external of the bowl (100); and detection unit (410), which detects the amount of condensate generated in the bowl (100). a washing machine and a method for controlling it are disclosed. the washing machine includes a cabinet; a tub attached to the cabinet; a drum rotatably provided in the bowl; a dry duct that heats the exhausted air from the vat to a predetermined temperature, to replenish the heated air to the vat; condensing unit, which condenses moisture in at least a predetermined area of an internal circumferential surface of the vat by exchanging heat from the external air of the cabinet with at least the predetermined area of an external circumferential surface of the vat; and detection unit that detects the amount of condensate generated in the tank.
    公开号:BR112013009447B1
    申请号:R112013009447-8
    申请日:2011-09-30
    公开日:2020-10-06
    发明作者:Sangwook Hong
    申请人:Lg Electronics Inc；
    IPC主号:
    专利说明:

    Technique Field
    The present invention relates to a washing machine and a control method for it. Basis of the Technique
    Generally, a washing machine is an electrical appliance that is able to remove various contaminants connected to clothing, bedding and wearable items (henceforth, dirty clothing) when using detergent emulsion action, friction of water currents generated by spinning of a pulsator or drum and shock applied to dirty clothing. A fully automatic washing machine that is recently introduced performs a series of cycles including washing, rinsing and spinning strokes automatically, without manual operation.
    Recently, demands for drum-type washing machines have gradually increased, because drum-type washing machines can reduce an overall height and not cause problems with wrinkles and tangles generated in dirty clothing, compared to pulsating washing machines.
    To place a drum-type washing machine structure mentioned above in a simple way, the drum-type washing machine includes a cabinet that defines its exterior appearance, a bowl located in the cabinet, being supported by a damper and a spring, to receive washing water in it, and a cylindrically oriented drum located in the tub to receive dirty clothing in it. A driving force is transferred to the drum by a drive part to wash the dirty clothing loaded inside the drum.
    Such a drum-type washing machine having the aforementioned structure generates vibration because of a rotating force of the drum generated when it is spun and an inevitable consequence is the eccentricity of dirty clothing. The vibration generated by turning the drum is transferred out through the bowl and cabinet.
    Because of this, it is necessary to provide the spring and damper provided between the bowl and the cabinet to suspend and dampen the bowl vibration and to prevent the vibration transferred to the bowl from the drum being transferred to the cabinet.
    In the meantime, the drum washing machine mentioned above is installed in an environment where there is an installation (for example, a sink environment or an integrated environment), not installed separately. As a result, the size of the drum-type washing machine must be limited by an installation environment.
    It is limited to altering the internal structure of such a drum-type washing machine so that the spring and damper structure, provided between the bowl and the cabinet, prevents and dampens vibration, as mentioned above. Also, it is limited to changing the size of the washing machine, because the installation environment of the drum-type washing machine is limited.
    Recently, a large number of research and developments are underway on increasing the washing capacity of the washing machine to improve the number of washing objects and user convenience. However, it is very difficult to improve the size of the bowl in the frame of the conventional drum-type washing machine to improve the washing capacity, because of the limited conditions mentioned above.
    In the meantime, the washing machine can be classified into a washing-only device, with only one washing function, and a washing machine with a drying function.
    The washing machine having the drying function can be classified based on the structure or type in a drum type dryer capable of drying dirty clothes by spinning and drumming the dirty clothes performed by a rotating drum and a tumble dryer. cabinet type capable of drying the dirty clothes that hang on it.
    The drum-type washing machine having the drying function can include a cabinet that defines an exterior appearance of it, a bowl mounted on the cabinet and a drum rotatable mounted on the bowl.
    In addition, a dry duct where dry air is circulated, a heater and a ventilation fan that are installed in the dry duct, and a condensation duct where wet air used for drying is circulated and condensed, can be provided outside the tank. Condensation media of the chilled water or auxiliary cooled air type used for condensation can be provided in the condensation duct.
    Hot air is supplied to dirty clothing in the conventional washing machine by controlling a heater, in other words, by turning a heater on / off. However, the heater control can control the heater on / off in relation to the heater temperature or the temperature near the heater. Because of this, the conventional washing machine has a problem of failure to prevent overheating that can be generated at a specific point in an entire passage where air is circulated.
    More specifically, hot water that is heated after dehumidifying can be provided between the heater and the drum, and heat exchange can be performed on the drum or in the bowl. After that, the heated air that has undergone heat exchange after being dehumidified can be attracted to the heater again. As a result, the possibility of overheating generated in the passage of heated air between the heater and the drum can grow at a disadvantage. This is because it can be said that there is no efficient heat transfer object such as an element of water in such a passage. Especially, as the heated air is constantly supplied at an early stage of the heated air supply, the possibility of overheating in the passage of heated air between the heater and the drum seems to grow more.
    Such overheating can generate heat distortion or damage to elements. Because of this, there may be a concern to impair the washing machine's reliability and stability.
    In addition, the washing machine having the drying function according to the state of the art determines a moment to determine whether the drying of the dirty clothing is complete using a temperature sensor provided in the dry duct. That is, the temperature of the heated air collected after drying the dirty clothing is measured repeatedly, to determine a final drying time.
    However, it is possible to accurately detect the final drying time when using the temperature of the heated air. Because of this, drying is performed for a shorter period of time that fails to reach the final drying time and it happens that dirty clothing is not sufficiently dried. Or, drying is carried out for a longer period of time that passes the final drying moment and the dirty clothing consequently suffers damage.
    To determine the final drying time, the drying time is fully adjusted by simply detecting the amount or humidity of dirty clothing. Once the set drying time has passed, drying is set to stop. However, the final drying time of drying dirty clothing performed according to the operation of such drying module can be adjusted differently based on a type of dirty clothing and a relative humidity. As a result, an actual final drying time may differ from the pre-set drying time.
    Therefore, the conventional washing machine having the drying function may have a problem of incomplete drying of dirty clothing because of the change in external condition. In this case, the user must carry out additional drying of the dirty clothing inconveniently. Also, there is a problem of over-drying performed on dirty clothing because of a change in the external condition. In this case, damage to dirty clothing can be caused by excess heated air. As a result, it is required to detect the precise final drying time. Disclosure of the Invention Technical problem
    To solve the problems, an objective of the present invention is to provide a washing machine having a drying function that can increase the capacity of a tub in a state of maintenance of an outer size applied to a conventional washing machine and that can improve a support structure capable of effectively supporting the increased capacity tank.
    Another objective of the present invention is to provide a washing machine that can prevent overheating by effectively controlling the temperature of the heated air, to improve stability and reliability.
    In addition, an objective of the present invention is to provide a washing machine that can reduce the increase in drying time by heated air as much as possible by effectively controlling a heater, to improve user stability and convenience.
    A further objective of the present invention is to provide a washing machine that is safe by preventing the breaking of an overheated glass door located on the front of a drum.
    A further object of the present invention is to provide a washing machine that can perform natural cooling type condensation without using auxiliary forced cooling means. In other words, an auxiliary configuration for cooling the water supply or cold air supply may not be provided to condense the moisture contained in air and the washing machine according to the present invention has a simple configuration. Alternatively, in the case of forced cooling type condensing performance, the present invention can provide a washing machine having an improved condensation rate.
    To solve the problems, the present invention provides a method for determining a drying completion point that can determine drying of dirty clothing by detecting a surface temperature of a vat while drying dirty clothing is performed, and a drying method using the same.
    In addition, to solve the problems, the present invention provides a method for determining the completion of drying of a washing machine having a drying function that can condense dry air having dried dirty clothing on an inner wall of a tub when using air and which can determine a drying completion point for dirty clothing by using the amount of condensate generated on the inner wall of the tub. Solution to the Problem
    To achieve these objectives and other advantages and in accordance with the purpose of the invention, as embodied and widely described here, a washing machine includes a cabinet; a tub attached to the cabinet; a drum rotatably provided in the bowl; a dry duct that heats the exhausted air from the vat to a predetermined temperature, to replenish the heated air to the vat; condensation means that condenses moisture in at least a predetermined area of an inner circumferential surface of the tub when exchanging heat from the outside air of the cabinet with at least a predetermined area of an outer circumferential surface of the tub; and detection means that detect the amount of condensate generated in the tank.
    In another aspect of the present invention, a method of controlling a washing machine including a heater that heats air and a fan that supplies air to the tub, the control method includes steps of: detecting the first amount of dirty clothing; detection of the second quantity of dirty clothing; calculation of the expected amount of condensate based on the first and second detected amounts of dirty clothing; detection of the expected amount of condensate based on the first and second amount of dirty clothing detected; detection of condensate generated while drying dirty clothing is performed; and determining a drying completion point by comparing the detected quantities of the condensate and the expected quantities of the condensate.
    In a further aspect of the present invention, a method of controlling a washing machine includes steps of: detecting the condensate generated while drying dirty clothing is performed; detecting a decreasing rate of the detected amount of condensate; and completion of drying, when the decreasing rate of the condensate quantity is equal to a pre-established value or less. Advantageous Effects of the Invention
    The present invention has the following advantageous effects. According to the present invention, there may be an effect of increasing the capacity of a tub in a state of maintenance of an exterior size applied to a conventional washing machine and of improving a support structure capable of effectively supporting the capacity tub. increased.
    In addition, the present invention can provide a washing machine that can prevent overheating by effectively controlling the temperature of heated air, to improve stability and reliability.
    Still further, the present invention can provide a washing machine that can reduce the increase in drying time by heated air as much as possible by effectively controlling a heater, to improve stability and user convenience.
    In addition, the present invention can provide a washing machine that is safe in preventing the breaking of an overheated glass door located in a front part of a drum.
    Still further, the present invention can provide a washing machine that can perform natural cooling type condensation without using auxiliary forced cooling means. In other words, an auxiliary configuration for cooling water supply or cold air supply may not be provided to condense the moisture contained in air and the washing machine according to the present invention has a simple configuration. Alternatively, in the case of forced cooling type condensing performance, the present invention can provide a washing machine having an improved condensation rate.
    In addition, there may be a reduced maintenance effect of less water use, because air having dried the dirty clothing is condensed by heat exchange performed between the outside air sucked in with a circumferential surface of a vat.
    In addition, there can be an effect of determining a drying completion point precisely when using the amount of condensate generated on an inner wall of the bowl.
    In addition, according to a method of determining the drying completion point of a washing machine and a drying method using it, there may be a drying determination effect for dirty clothing when detecting a surface temperature of a washing machine. tub while drying dirty clothing is performed. Brief Description of the Figures
    The attached figures, which are included to provide additional understanding of the disclosure and are incorporated into and constitute a part of this application, illustrate disclosure modalities and together with the description serve to explain the principle of disclosure. In the figures:
    FIG. 1 is an enlarged perspective view showing a washing machine according to an embodiment;
    FIG. 2 is a perspective view illustrating a tub, drum and dry duct provided in the washing machine shown in FIG. 1;
    FIG. 3 is a block view schematically illustrating the structure of the washing machine shown in FIG. 1,
    FIG. 4 is a graph illustrating a method of controlling a heater according to an embodiment;
    FIG. 5 is a sectional view of A shown in FIG. 2;
    FIG. 6 is a temperature graph according to the heater control based on a single (or invariable) upper / lower limit temperature;
    FIG. 7 is a flow chart illustrating a method for determining an end of drying according to an embodiment;
    FIG. 8 to 10 are graphs illustrating a change in the vat surface temperature according to various quantities of dirty clothing;
    FIG. 11 is a perspective view illustrating a tub, drum, dry duct and condensation medium provided in a washing machine including an air-cooled condensation medium according to an embodiment;
    FIG. 12 is a cross-sectional view illustrating the bowl shown in FIG. 11 that is mounted in a cabinet;
    FIG. 13 is a perspective view illustrating a tub, drum, dry duct, condensing means provided in a washing machine including cooled air type condensing means according to another embodiment;
    FIG. 14 is a cross-sectional view illustrating the bowl shown in FIG. 13 that is mounted in a cabinet; and
    FIG. 15 is a flow chart illustrating a method for determining an end of drying. Best Way to Carry Out the Invention
    As follows, embodiments of the present invention will be described in detail with reference to the accompanying figures.
    The present invention relates to a washing machine having a drying function and is not limited to a washing machine of a specific type. The present invention is not limited to a drum-type dryer or a drum-type washing machine having a drying function, which will be described below. FIG. 16 illustrates a washing machine according to an embodiment. The washing machine shown in Fig. 1 is a washing machine having a drying function. This modality represents that a part of condensation provided in the washing machine according to this modality is a vat.
    The washing machine according to the present invention can include a bowl 100 that is fixedly supported by a cabinet 10. The bowl 100 can include a front of bowl 110 defining a front of it and a rear of bowl 120 defining a rear of it .
    The front of the bowl 110 and the rear of the bowl 120 can be mounted by a screw to form a predetermined room where a drum is received. The bowl rear may include an opening formed in a rear portion thereof. The opening at the rear of the bowl 120 is connected with a rear gasket 250 which is a flexible member and an inner radial direction portion of the rear gasket 250 can be connected to a rear part of the bowl 130. A through hole is formed in a center from the rear of the bowl 130 and a rod passes through the through hole. The rear gasket 250 can be flexible enough to prevent vibration from the rear of the bowl 130 from being transferred to the rear of the bowl 120.
    The rear gasket 250 is sealed to be connected with the rear of the bowl 130 and the rear of the bowl 120, to prevent the washing water inside the bowl from leaking. The rear part of the bowl 130 is vibrated together with the drum when the drum is turned. The rear of the bowl 130 is spaced at an appropriate distance from the rear of the bowl 120, so as not to interfere with the rear of the bowl 120. Since it is flexibly transformed, the rear gasket 250 allows the rear of the bowl 130 move more relatively without interfering with the rear of the bowl 120. The rear gasket 250 may include a curvature portion or a wrinkle portion that is extendable long enough to allow relative movement of the rear portion of the bowl 130.
    The tub has a dirty clothing insertion opening formed at the front of it to introduce dirty clothing into the washing machine. A front gasket 200 can be installed in a front part of the tub where the dirty clothing introduction opening is formed, to prevent dirty clothing from being discharged through the opening or to prevent dirty clothing or foreign matter from being drawn into an interval between the bowl and the drum or for another function.
    The drum 300 can include a drum front part 305, a drum center 320 and a drum rear part 340. Balancers 310 and 330 can be installed in front and rear parts of the drum, respectively. The drum rear 340 can be connected with a crosshead 350 and the crosshead 350 can be connected with a rod 351. The drum can be rotated inside the bowl by a rotating force transmitted through the rod 351.
    The rod 351 can be connected with a motor, through the back of the bowl 130. According to this modality, the motor can be connected with the rod concentrically. In other words, the engine is directly connected to the rod according to this modality. Specifically, a motor rotor is directly connected with stem 351. A support housing 400 is coupled to a rear surface at the rear of bowl 130. Support housing 400 can support the stem 351 in a rotating manner, being located between the motor and the back of the bowl 130.
    A motor stator (not shown) is fixedly attached to the support housing 400. The rotor (not shown) is located around the stator. As mentioned above, the rotor is directly connected with rod 351. The rotor is an outboard motor and is directly connected with rod 351.
    The support housing 400 is supported by a suspension unit with respect to a cabinet base 600. The suspension unit can include a plurality of supports connected to the support housing. The plurality of supports may include radial direction supports 430 and 431 extended along a radial direction and stem direction supports 440 and 450 extended along a drum stem direction, being connected with the support housing.
    The suspension unit may include a plurality of suspensions connected with the plurality of supports.
    In this embodiment, the suspensions may include three perpendicular suspensions 500, 510 and 520 and two ramp suspensions 530 and 540 installed obliquely with respect to a forward and backward direction. The suspension unit is flexibly connected to the cabinet base 600 to allow the drum to move in the forward / backward and right / left directions, not connected with the cabinet base 600 in a fixed manner. In other words, the suspension unit is flexibly supported to allow the drum to rotate along the forward / backward and right / left directions in relation to the points connected with the cabinet base. For flexible support, perpendicular suspensions can be installed for cabinet base 600 by means of a rubber bushing. Perpendicular suspensions can be configured to suspend drum vibration in an elastic way and downhill suspensions can be configured to dampen vibration. In other words, perpendicular suspensions can be employed as a spring and the slope suspension can be employed as damping means in a vibration system including a spring and damping means.
    The bowl is fixedly mounted on the cabinet and the vibration of the drum is suspended by the suspension unit. Front and rear surfaces of the tub can be attached to the enclosure and the tub can be seated in a supported manner on the enclosure base, more specifically, attached to the enclosure base.
    Substantially, the bowl and drum structure can be separated in the washing machine according to this modality. It can be said that the washing machine according to this modality has the structure in which the bowl may not be structurally vibrated, even when the drum is vibrated. Here, the amount of drum vibration transferred to the bowl can be varied according to the rear gasket.
    The tub vibration is remarkably small in the washing machine according to this mode. Because of this, the washing machine according to this modality does not need a maintained interval for vibration in the conventional washing machine and, consequently, an external surface of the tub can be located as close as possible to the cabinet. This makes it possible to increase the size of the tub and improve the capacity of the washing machine, with the same external size.
    Substantially, the gap between the bowl and a right cabinet 630 or a left cabinet 640 is more than 5mm in the conventional washing machine with the bowl vibrating together with the drum, the gap between the bowl and the cabinet is 30mm to make that the vibration of the bowl does not interfere with the cabinet. Considering a bowl diameter, a bowl diameter according to this modality can be enlarged by 50 mm, compared to the diameter of the conventional bowl. This results in a noticeable difference that allows the washing machine's capacity to be increased to a higher level, with the same outside size.
    Although not shown in the figures, the washing machine may include a water supply valve connected to a commercial water supply to supply washing water to the tub. Also, a detergent box can be installed in the washing machine.
    The water supply valve can be connected to the detergent box using a hose. The detergent box can be connected to the tub using a hose. Because of this, when the wash is performed, the water supply valve is turned on to supply water to the tub via the detergent box from the commercial water supply.
    In the meantime, according to this modality, all the heated air discharged from the dry duct can be substantially supplied to the interior of the drum. This is because the heated air directly attracted into the space between the bowl and the drum concerns the natural disturbance condensation that will be described below. As a result, a heated air inlet 25 can be provided to supply the heated air towards the interior of the drum from a front portion of the drum 300.
    The heated air inlet hole 25 can be provided through the front gasket 200. Here, the gasket is an element configured to prevent washing water from leaking out of the bowl through the front opening of the drum. As a result, the heated air inlet port 25 can be located in front of the front opening of the drum 300. The heated air inlet port 25 can be provided to conduct the heated air perpendicularly to supply substantially all of the heated air discharged to the inside the drum.
    Dry duct 20 can include a connection duct 27 inserted into the heated air inlet hole 25 and a roller 23 connected with a heated air outlet hole 51 formed in bowl 100. Here, roller 23 can have a fan 22 located in it and a heater 21 can be installed between the connection duct 27 and the roller 23.
    In the meantime, the front gasket 200 coupled to a front portion of the front of the bowl 110 can have a duct connection part 26 formed therein to be inserted into the heated air inlet port 25, such connection duct 27 and the connection port heated air inlet 25 can be sealed. The connection duct 27 can be inserted into the duct connection part 26 of the front gasket 200. The connection duct 27 can be fitted into the dry duct 20 with the heater installed in it in an upward direction and can be positioned flush with the heated air inlet hole 25 in a downward direction, with duct connection part 26 of the front gasket located between them.
    In most cases, a door configured to open and close the front opening of the drum may include a glass door (not shown). The glass door is formed of glass or reinforced plastic to allow a user to see the inside of the drum through the outside of the drum. Typically, such a glass door can be designed towards the inside of the drum to perform a function of preventing dirty clothing from moving into the front opening of the drum. The door and the glass door are well known knowledge and, consequently, their detailed description will be omitted.
    According to this embodiment, a top portion of the glass door can be sloped downwards to guide the heated air discharged from the heated air inlet 25 perpendicularly towards the interior of the drum. The location of such a heated air inlet 25 and the appearance of the glass door can allow all the heated air discharged to be guided substantially towards the interior of the drum. When the door is closed, a predetermined portion of the glass door is located more internally within the barrel than the front gasket 200.
    Such a drum inlet shape and structural feature can further improve drying efficiency. However, overheating can be generated in the drum inlet passage. Especially, overheating of the glass door can be a problem. To solve this problem, heating control is required and this will be described below.
    FIG. 17 illustrates an internal structure of the washing machine. As shown in FIG. 2, the washing machine includes the dry duct 20 having the heater 21 provided therein and the drum 300 configured to perform drying of the dirty clothing by the heated air attracted from the dry duct 20.
    This mode can additionally include the bowl 100 configured to perform washing.
    In the meantime, a controller (30, see FIG. 3) can be provided to control the temperature of the heated air or the temperature of the heater. The controller can be provided to control the operation of each element composing the washing machine.
    More specifically, the controller can be provided to control the on / off of the heater. For the control of the heater, a temperature sensor (23, see FIG. 3) can be provided to detect the temperature of the heater. The temperature sensor can detect the temperature of the heater 21 or the temperature near the heater and the temperature detected by the temperature sensor can be referred to as "detected temperature".
    The controller can control heater 21 to be turned on to initiate heated air drying and this can control heater 21 based on the temperature detected by the temperature sensor (the detected temperature). In other words, the controller can control the on / off of the heater based on the detected temperature.
    The controller can vary at an upper limit temperature when the heater is off and this can raise the upper limit temperature gradually.
    As shown in FIG. 2, this modality can omit the condensation duct, different from the conventional dryer. In other words, the predetermined space between the bowl 100 and the drum 300 can be used as a condensation space, which will be described below.
    The washing machine shown in FIGS. 1 and 2 can further increase the volume of the tub and the volume of the drum, with the same size as the cabinet, compared to the conventional washing machine. As a result, a surface area of the bowl can be enlarged and the natural cooling of the heated air can be performed satisfactorily. In this case, most of the moisture from the heated air supplied to the inside of the drum can be evaporated inside the drum and heat from the heated air can be emitted to the surface of the bowl from the space between the drum and the bowl to perform condensation. . The heated air whose heat is condensed can be exhausted through the heated air outlet port 51 shown in FIG. 2 and such heated air can be drawn back into the dry duct 20. Here, such air circulation can be performed by the operation of the fan 22.
    For natural condensation, it is possible to increase the number of fan turns 22 more than the fan in the conventional washing machine having the same pattern. In other words, the speed or amount of air can be increased even more. If the capacity of the heater is the same, increasing the speed or amount of air means increasing the heat exchange area per unit of time. It is the same principle that dirty clothing dries faster with a lot of wind in mild weather than with less wind. As a result, heat suction and heat exhaustion can be performed much more quickly in the overall system.
    Increasing the speed or amount of air can be allowed by omitting the condensation duct. It is limited by the resistance of passage of the condensation duct to increase the speed or the amount of air. It is possible to omit the condensation duct and attract the heated air into the dry duct directly from the tub. Because of this, it is possible to increase the speed or amount of air when using the fan. In this case, it is preferable that the cutting area of the heated air outlet orifice 51 is wider in this embodiment than in the case using the condensation duct.
    According to this modality, the washing machine can provide a drying part having a rod connected to the drum, a support housing rotatingly supporting the rod and a motor rotating the rod, and a suspension unit connected to the housing support for suspending drum vibration, as shown in FIG. 1.
    In other words, unlike the conventional washing machine, the suspension unit may not support the bowl and this can suspend the drum vibration directly through the support housing. As a result, the vat vibration can be minimized just to increase the vat volume further. In other words, the bowl can be supported more rigidly than the drum is supported by the suspension unit.
    In addition, the washing machine according to this modality may include a flexible member configured to seal the rear portion of the tub to prevent water from leaking into the actuation part from the tub, allowing the actuation part to be moved by the vat relatively.
    Natural condensation can be allowed in the space between the drum and the bowl due to the structural characteristics of the bowl, drum and suspension unit.
    In the meantime, FIG. 3 is a diagram schematically illustrating the structure of the washing machine mentioned above.
    Referring to FIG. 3, the heater 21 configured to heat the air is provided for drying. The heater is not controlled to be constantly on while drying is performed. This is because the heater is concerned with overheating itself and concerns a very high temperature of the heated air, heated by the heater. As a result, it is preferable that the heater on / off is controlled properly.
    In a state where the heater is off, the air temperature can be lowered. However, it is preferable that the air temperature is high to perform drying effectively. As a result, a period when the heater is off can be adjusted appropriately in consideration of overheating and cooling.
    Considering the particularities mentioned above, the on / off of the heater can be controlled. In other words, it can be controlled repeatedly that the heater is turned off at a preset upper limit temperature and that the heater is turned on at a preset lower limit temperature. As a result, the length of time the heater is off can be controlled indirectly.
    Overheating of the heater and heated air can be prevented by adjusting a preset upper limit temperature appropriately and cooling it can be prevented by adjusting the preset lower limit temperature appropriately. As a result, the drying time can be reduced very effectively.
    To heat the air when using the heater, a fan 22 can be provided to generate air flow.
    Also, a configuration to form a predetermined space to accommodate the dirty clothing can be provided and the dirty clothing can be dried by the air heated by the heater in that space. The configuration forming such a space can be the drum 300.
    The drum may be a drum provided in the conventional washing machine or a piece of dirty clothing accommodation provided in the cabinet. In the case of the conventional washing machine, an engine (not shown) configured to drive the drum can be provided and this may mean that the drum includes a dirty clothing accommodation piece provided in a cabinet type dryer.
    A controller 30 can be provided to control the activation of heater 21. Here, controller 30 can drive or control the fan 22 mentioned above or the motor. In other words, the controller 30 can perform the control required to operate the washing machine.
    A parameter used by controller 30 to control the operation of heater 21 can be variable and the parameter can include a temperature parameter. As a result, a temperature sensor 23 can be provided additionally to detect the temperature of the heater 21 or the temperature near the heater 21.
    Additionally, the air can be heated in a predetermined space, considering heat efficiency. As a result, a dry duct 20 can be provided to provide space to heat the air. Here, inside the dry duct 20, the temperature sensor or fan 22 mentioned above as well as the heater 21 can be provided.
    Washing objects, in other words, dirty clothing having a humidity can be accommodated in drum 300. Water is boiled at 100 ° C in a normal state and the water absorbs a large amount of heat when a phase of the water is changed to steam ( that is, evaporated). Because of this, it is difficult for the temperature inside the drum to be above 100 ° C as a certain amount of water remains in the drum.
    Obviously, even if the air temperature inside the drum 300 does not reach 100 ° C, evaporation can be performed and a large amount of heat can be absorbed in that time. The amount of moisture evaporated in that time can be increased more as the temperature is increased.
    The amount of moisture evaporated in an initial drying of drying, in other words, in an initial drying stage by heated air can be small and the heater is constantly on. Because of this, the temperature of the heated air can be increased constantly and the temperature inside the drum can be increased as well. However, when the temperature of the heated air drawn into the drum is about 100 ° C, the temperature inside the drum is varied between 50 ° C and 75 ° C.
    Here, the heater on / off can be controlled to increase the temperature inside the drum by using the heated air properly to make the inside of the drum optimized for drying. The problem here is that the temperature inside the drum can be controlled properly by turning the heater on / off, but this overheating can be generated in other elements.
    As shown in FIG. 3, the heated air can be drawn into the drum from the dry duct 20. The heated air that has undergone heat exchange in the drum 300 can be drawn back into the dry duct 20. This case can be called as circulation type drying. that circulates air. In contrast, the heated air that has undergone heat exchange in the drum 300 can be exhausted out of the washing machine and this case can be called as an exhaust type drying. In exhaustion drying, external air is attracted into the dry duct 20.
    In any type, the temperature of the air drawn into the dry duct 20 can be lower than the temperature of the air exhausted from the dry duct 20. Also, there is little possibility of the remaining moisture in the passage of heated air from the dry duct 20 to the drum (hereinafter referred to as "drum entry passage"). As a result, the air temperature along the drum inlet passage can be raised to very high, compared to the air temperature inside the drum. This can cause heat damage, heat distortion and breakage that are generated by the elements overheating. The high temperature can be transferred outside to cause burns to the user. Here, the damage caused by overheating can be prevented to some extent by a heat resistant material or heat insulating material, but this results in an increase in the price of the product and in the complex structure.
    Especially, such overheating is likely to occur in the initial drying of the heated air drying. This is because the initial drying is a period where the heater is constantly on to increase the temperature of the heated air and the temperature inside the drum constantly.
    In other words, the amount of heat attracted is greater in the drum inlet passage than the amount of heat transferred. As a result, the temperature at the drum inlet passage is increased more than the temperature of heater 21 or close to heater 21 (hereinafter, referred to as "detected temperature") is increased. Based on the result of the experiments performed by the inventor of the present invention, when the temperature detected in the initial drying of the heated air drying reaches a pre-set upper limit temperature, for example, 106 ° C, it is shown that the highest temperature in the drum inlet passage is increased to 160 ° C. Here, there may be a deviation in the detected temperature according to the location of the temperature sensor, that is, which temperature location is detected.
    Such excess temperature rise could play a large role in deteriorating the durability of the elements located in the drum inlet passage. Especially, in the case of the glass door made of glass which is provided in such a drum inlet passage, overheating can cause the glass door to break.
    To solve the problem, the preset upper limit temperature can be changed so as not to be fixed during the entire drying process. In other words, the preset upper limit temperature can be changed gradually, considering the temperature of the heated air and the drying time.
    Here, a preset upper limit temperature in a period when drying is performed more actively is very important to perform drying for an optimal period of time. The period in which drying is performed most actively means a period in which moisture evaporation is most actively generated. Because of this, the greatest heat absorption is generated in the period and the greatest amount of heat can be supplied to the interior of the drum.
    As a result, if the entire heated air drying process is divided into a plurality of periods, there may be an initial drying in which the temperature rise and moisture evaporation within the drum are expanded, an intermediate drying in which the evaporation of moisture is generated more actively and a final drying in which the evaporation of moisture is gradually decreased. As a result, the preset upper limit temperature mentioned above can be adjusted to allow optimal drying to be performed in the intermediate drying. In view of this, the preset upper limit temperature can be adjusted to be 106 ° C. Here, the temperature can correspond to the conventional drying performed to dry dirty clothing that is heat resistant such as clothing made from cotton. Considering the characteristics of the dirty clothes that are the drying object, the temperature can be adjusted relatively lower. The preset upper limit temperature can be a temperature set for the intermediate drying or a temperature set for the intermediate drying and the last drying. This is because the upper limit temperature can cause overheating in the initial drying.
    Referring to FIG. 4, control of the heater in the heated air drying process will be described in detail.
    First, the heater is initially turned on and heated air drying begins. When the temperature reaches the pre-set upper limit temperature after that, the heater is switched off. Here, the preset upper limit temperature, set to initially turn off the heater after the heated air drying starts, may be lower than the preset upper limit temperature set for the intermediate drying mentioned above. The previous preset upper limit temperature can be referred to as "T1" and the last preset upper limit temperature can be referred to as "T3". In other words, T1 can be preset less than T3.
    Since drying by heated air is performed for a pre-established period of time (t1) in a state where the heater is on, the heater is turned off. In other words, the temperature of the heated air and the temperature inside the drum can be increased constantly until the preset time period (t1) has passed. The time period (t1) can be variable based on the amount of dirty clothing or the amount of moisture that will be dried. In other words, as the amount of dirty clothing and the amount of moisture increase, t1 increases.
    However, the drum inlet temperature can be prevented from increasing in excess by adjusting T1 below T3 as mentioned above, which will be described below.
    In the meantime, the temperature at which the heater is turned on again after turning off is important as well as the temperature at which the heater is turned off. The temperature at which the heater is switched on again after switching off can be referred to as "preset lower limit temperature". The preset lower limit temperature can be adjusted accordingly, taking into account a detection deviation of the temperature sensor in relation to the preset upper limit temperature, to prevent overcooling.
    Such a pre-set lower limit temperature can be pre-set to be constantly uniform throughout the heated air drying process. Here, it can be variable based on the preset upper limit temperature (T1 or T3). In the latter case, if the preset upper limit temperature is increased, the preset lower limit temperature can be increased.
    First, when the heater is turned off after the heated air temperature reaches T1, it is controlled so that the temperature reaches the pre-set lower limit temperature so that the heater turns the heater on again. After that, it can be controlled so that the heater is switched on / off repeatedly in a range between T1 and T3 for a pre-established period of time (t2). T1 can be changed to T3, which can be called "two-step increase" and that is because T1 that is adjusted once is changed to T3 again. Also, T1 can be changed to T2 which is higher than T1 and T2 can be changed upwards in t3 after a preset time period (t3) has passed, which can be called as "three step increase."
    Here, a preset lower limit temperature corresponding to T2 can be referred to as "Tb" and a preset lower limit temperature corresponding to T3 can be referred to as "Tc". Here, T2 can be higher than T1 and T3 can be higher than T2. In other words, the preset upper limit temperature can be adjusted to increase (raise) gradually. Also, the preset lower limit temperature can be adjusted to increase (raise) gradually.
    In short, the heater can be controlled in a range between T1 and Ta to t2 as a first step. The heater can be controlled in a range between T2 and Tb to t3 as a second step. The heater can be controlled in a range from T3 and Tc to t4 as a third step.
    The time period of t1 can be the initial drying and the time period in which the heater starts to be controlled in T3, that is, the previous time period t1 + t2 + t3 can be the initial drying. The period of time after may be intermediate drying.
    As a result, the preset upper limit temperature can be raised through predetermined steps before intermediate drying (t4), but T3 may not be changed after intermediate drying. Obviously, Tc may not be changed either. T3 and Tc may not be changed until heated air drying is complete.
    In the meantime, as mentioned above, the time (t1) which is the period of time until T1 is reached after drying starts may not be fixed. In other words, the time (t1) may not be changed based on the amount of dirty clothing or the amount of moisture. Because of this, the time period in which T1 is adjusted to rise to T2 or T3 (t2 or t3) can be changed according to t1. For example, if t1 is 20 minutes, T1 can be adjusted to rise after 10 minutes. If t1 is 26 minutes, T1 can be adjusted to rise after 13 minutes. In other words, the on / off of the heater can be controlled by using T1 and Ta from t1 to t2. After t2, the heater on / off can be controlled using T2 and Tb. After t3, for example, if t1 is 20 minutes, t3 can be 10 minutes and if t1 is 26 minutes, t3 can be 13 minutes. The on and off of the heater can be controlled using T3 and Tc.
    In other words, an elevation point of T1 can be differentiated by t1. In case of multi-stage elevation, t2 and t3 can be adjusted by the same range for t1. If the range is 0.5, the range of t2 and t3 can be (t1) / 2. If four-step elevation is performed, T1 can be adjusted to rise after a period of time (t1) / 3.
    Also, a difference between T1 and Ta may not be changed. In other words, the difference between T2 and Tb can be identical to the difference between T3 and Tc. This is to prevent overcooling and errors that are generated by deviation from the temperatures detected by the temperature sensor.
    The heated air drying described above can be a specific drying course. This can be a series of strokes that are performed until the washing machine is stopped to operate after starting to operate or it can be a specific cycle composing such a series of strokes. In other words, the heated air drying can be a cycle that ends after the heater is switched on / off which is controlled once the heater is initially switched on. Such a heated air drying cycle is performed multiple times to form a single drying cycle. As a result, once t4 passes, the heated air drying ends as shown in FIG. 4. Only the fan can be driven by t5 and cold air can be supplied. As a result, drying by heated air can mean the period from the time when the heater is turned on until the heater turns on / off performed based on the detected temperature termination, in a strict detection.
    As follows, the effect of preventing overheating will be described in detail with reference to FIGS. 5 and 6.
    FIG. 5 is a cross-sectional view of "A" shown in FIG. 2. In other words, a specific portion of the drum inlet passage, i.e., a cutting area of the connection duct 27 is illustrated. FIG. 6 is a temperature graph showing heater control based on a single (invariable) upper / lower limit temperature.
    The inventor of the present invention performs experiments that measure temperatures from various points as shown in FIG. 5 to measure a degree of overheating in the drum inlet passage when heated air drying. Although not shown in the figures, the temperature in an upper portion of the glass door is measured and the measurement result is shown in FIGS. 4 and 6.
    First, FIG. 6 shows temperature change in a setting state of T3 and Tc to be fixed in the heated air drying. As shown in FIG. 6, the temperature is raised to the highest limit of 160 ° C at the drum inlet passage. In other words, when the detected temperature reaches T3, the heater is turned off for the first time and it is shown that overheating is generated at a specific point in the drum inlet passage at that time.
    It is shown that more overheating is generated in points (HE01 to HE05, TM_HE) from the right to left direction. This can be expected from the amount or speed of air differentiated at the points because of the shape of the fan or the structure of the dry duct.
    Also, as shown in FIG. 6, the temperature in the glass door is raised to the highest limit of 120 ° C. As a result, it can be expected that overheating will be generated in the drum inlet passage including the glass door in the heated air drying, especially in the initial drying of the heated air drying.
    However, when the heater is controlled according to T1 less than T3 or T1 and T2 in the initial drying of the heated air drying, the upper limit temperature in the drum inlet passage can be lowered to approximately 130 ° C. This shows that overheating in the drum inlet passage can be effectively prevented without varying the optimum T3 / Tc in the intermediate drying in which drying is performed most actively. In other words, overheating can be prevented very effectively even while maintaining drying efficiency as is and without increasing drying time.
    In particular, it is shown that the upper limit temperature in the glass door is lowered to approximately 115 ° C as shown in FIG. 4.
    Through this process, the heat shock of the glass door can be reduced and a more stable washing machine can be provided. Also, drying can be performed more efficiently without wasting energy.
    As below, a method for determining a degree of drying in the case of the washing machine having the above structure perform drying. The drying performance process can use the heater control method according to the present invention, which can prevent overheating as described above, or a control method similar to conventional dryer control. Either method can be used.
    A temperature sensor (not shown) can be provided in bowl 100 of the washing machine to detect the temperature of bowl 100. The temperature sensor detects the temperature of bowl 100 and the detected temperature is used for various controls of washing operations and drying operations. Such a temperature sensor can detect the temperature of a surface of the bowl 100. Here, the surface of the bowl 100 whose temperature is detected by the temperature sensor can be an internal surface or an external surface of the bowl 100. Also, the temperature sensor can detect the temperature of the heated air that is circulated through the dry duct 20. Such a temperature sensor can transfer a temperature signal to the controller (not shown). As will be described in detail below, a method of determining a degree of drying based on the temperature of the tank surface that is detected by the temperature sensor.
    In the meantime, the controller controls a general washing machine operation and it operates the washing machine according to the washing machine settings. The embodiment of the present invention is related to the process of drying dirty clothing. As a result, descriptions of washing, rinsing and spinning processes will be omitted because they are not related to the drying process. In addition, the controller detects the signal from the temperature sensor and it controls the motor, a drying module (the heater, the fan and the like) and a display panel, to determine the end of drying the dirty clothing supposed to be dried by through the entire drying process.
    The conventional dryer or conventional washing machine having the drying function can detect the amount of dirty clothing that will be dried as the drying operation begins. At this time, the amount of dirty clothing can be calculated by using an auxiliary load sensor or by using the load applied to the engine by rotating the drum 300. In other words, when the engine load, the amount of load applied to the engine can be detected differently depending on the amount of dirty clothing that will be dried. Consequently, the amount of dirty clothing can be detected by using the amount of load applied to the engine.
    From there, the controller can calculate the time it takes to perform drying based on the amount of dirty clothing that will be dried. The time used for drying dirty clothing can be calculated based on a pre-set table. In other words, the controller selects a drying time by extracting a drying time corresponding to the amount of dirty clothing detected from the preset table. After that, the controller can display the drying time selected in the display part. However, the drying time adjusted based on the amount of dirty clothing determined in accordance with this method can be applied uniformly. Because of this, sufficient drying fails to be performed in some cases or drying is performed in excess. For example, the amount of dirty clothing includes the weight of the dirty clothing and the weight of moisture. Because of this, a smaller amount or a larger amount of dirty clothing can be owned even by the same amounts of dirty clothing. This means that less or more moisture can be possessed. Even when the drying time is adjusted evenly based on the amount of dirty clothing, a degree of drying can vary according to the amount of moisture contained in the dirty clothing. As a result, a control method for achieving a desired drying degree by performing additional drying in consideration of the required drying degree or drying time will be described below. FIG. 7 is a flow chart illustrating the control method.
    Referring to FIG. 7, a control method according to a modality can detect the amount of dirty clothing (hereinafter, referred to as "the amount of dirty clothing" before performing a drying process (S110). The amount of dirty clothing can be set to include the amount of dirty clothing that will be dried and the amount of moisture contained in the dirty clothing.A method of detecting a quantity of dirty clothing is similar to the method mentioned above and the method is well known in the air to which the present invention Consequently, detailed description of the method will be omitted.
    After detecting the amount of dirty clothing, the controller can calculate a drying time corresponding to the amount of dirty clothing detected (S120), which is similar to the conventional method. The controller calculates the drying time by extracting the drying time corresponding to the amount of dirty clothing from a pre-set table.
    Thereafter, drying is performed. A drying performance method can be the method described above in accordance with the present invention, i.e., the method which can prevent overheating as mentioned in the reference to FIG. 4 or one similar to the drying performed in the conventional dryer. Such a drying process has been described above and consequently the repeated description will be omitted. During the drying process, the controller detects the surface temperature of the tank by using the temperature sensor provided in the tank 100 constantly or repeatedly (S130). This is because it is possible to determine a degree of drying of dirty clothing based on the surface temperature (hereinafter, referred to as the "surface temperature" of the tub).
    For example, FIGS. 8, 9 and 10 are graphs showing changes in the surface temperatures of the tub during the drying process of predetermined dirty clothing. A horizontal axis shown in each graph can refer to the passage along with the change in humidity and a vertical axis can refer to the change in the surface temperature of the vat.
    According to each of the graphs, as time passes along the horizontal axis from the left to the right, a percentage of moisture contained in dirty clothing, in other words, a moisture content in dirty clothing may be decreasing. As the drying is carried out, the moisture is removed from the dirty clothing and, in this way, the moisture content is decreasing. In the meantime, according to the vat's surface temperature, as time passes, the vat's surface temperature may constantly increase as the drying is performed after it starts. The surface temperature of the tank reaches "the upper limit temperature" without increasing any additional and decreases thereafter.
    Heated drying air is constantly supplied to the interior of the vat during the initial drying in which the drying starts to play and in the intermediate drying in which the drying is performed actively. Moisture can be removed from dirty clothing by providing heated drying air. The removed moisture receives the high temperature heat from the heated air and can be changed to gas, remaining very hot. Gaseous moisture can transfer heat to the vat inside the vat and the vat's surface temperature can be increased gradually. In other words, the surface temperature of the vat may increase in the initial drying and in the intermediate drying. That's because heat is transferred by the gaseous moisture removed from dirty clothing. Here, the increase in the surface temperature of the tub can be generated by the heated air and a main reason for the surface temperature to increase may be the heat transferred from the humidity to the tub. Because of this, the surface temperature of the vat reaches the highest temperature in the intermediate drying in which drying is performed most actively.
    However, when drying is performed after intermediate drying has passed, the amount of moisture removed from dirty clothing can decrease. As a result, the surface temperature of the vat may constantly decrease after intermediate drying and this may mean that the amount of moisture removed from dirty clothing decreases because drying is performed in excess.
    Because of this, a control method that will be described below can determine a degree of drying by detecting a decreasing degree of temperature after the surface temperature of the vat reaches the highest temperature.
    The controller can detect the highest temperature of the tank surface temperature by temperature detection (S140). In other words, the controller can detect temperature change when using the temperature sensor and can detect the highest temperature of the tank surface temperature. The highest temperature of the vat surface can be a temperature at which the vat surface temperature is maintained for a predetermined period of time, for example, 2 minutes or more, without any additional increase. Alternatively, when the vat's surface temperature decreases to a predetermined temperature, the controller determines a temperature just before the predetermined temperature causing the surface temperature to decrease as the highest temperature.
    From there, the controller can calculate "an average required time" (S150). Here, the average required time can be defined as a period of time from the time when the vat surface temperature starts to decrease from the highest temperature until the vat surface temperature reaches a pre-temperature decrease value adjusted (Δ). For example, a period referred to as t6 in the graph in Fig. 8 can be defined as the average required time. Here, the preset temperature decrease value (Δ) can be a preset default value, for example, 3. In other words, the controller can adjust the time period (t6 shown in Fig. 8) from from the time when the tank surface temperature decreases from the highest temperature to the preset temperature decrease value (Δ) of 3 degrees as the average required time.
    Here, the reason the average required time is calculated is as follows. The drying time can vary according to the amount of dirty clothing that will be dried, more specifically, the amount of moisture contained in the dirty clothing when drying. As a result, when the amount of dirty clothing is equal to a preset value or less (or when the amount of moisture contained in dirty clothing is equal to a preset value or less), the drying time may decrease. When the amount of dirty clothing is equal to a preset value or greater (or when the amount of moisture contained in dirty clothing is equal to a preset value or greater), the drying time may increase. This will be described in relation to the control method according to the present invention as follows. When the amount of dirty clothing is equal to a preset value or less (or when the amount of moisture contained in dirty clothing is equal to a value pre-established or less), the average required time may decrease. When the amount of dirty clothing is equal to a predetermined value or greater (or when the amount of moisture contained in dirty clothing is equal to a predetermined value or greater), the average required time may increase. The average required time can be determined based on the surface temperature of the bowl and this can be included in the total drying time. Because of this, the average required time can be changed in proportion to the change in total drying time.
    As a result, a degree of drying of dirty clothing is determined based on the average required time calculated to determine when to turn off the heater. For example, FIG. 8 is a graph illustrating a change in the surface temperature of the tub if the amount of dirty clothing is relatively small (for example, 1 kg or less). The average required time shown in FIG. 8 can be calculated to be t6 as mentioned above.
    In the meantime, the controller can compare the average required time with a pre-set reference time. If the average required time is less than the reference time, it is determined that drying is performed sufficiently and the heater is controlled to be switched off (S160). If the average required time is longer than the reference time, it is determined that drying is performed insufficiently and a temperature decrease value (Δ) is readjusted to recalculate the average required time.
    In other words, when the time required for the vat surface temperature decreases to the preset temperature decrease value (Δ) from the highest temperature is less than the reference time, it is determined that the amount of moisture contained in dirty clothing is relatively small and it is determined that drying is performed sufficiently.
    In contrast, when the time required for the vat surface temperature decreases to the preset temperature decrease value (Δ) from the highest temperature is less than the reference time, it is determined that the amount of moisture contained in dirty clothing it is relatively wide, just to determine that drying is insufficiently performed. Because of this, the temperature decrease value (Δ) can be readjusted. In this case, the temperature decrease value (Δ) can be varied according to the relationship between the average required time and the reference time. In other words, the reference time is pre-set and the temperature decrease value (Δ) can be adjusted according to the reference time. For example, the reference time includes a first reference time and a second reference time. The first reference time can be adjusted to be 90 minutes and the second reference time can be adjusted to be 240 minutes.
    In this case, when the average required time is less than the first reference time based on the result of the comparison between the two, the heater can be turned off at the end of the average required time. When the average required time is greater than the average reference time and less than the second reference time, the controller can change the temperature decrease value (Δ) by a first changed value having an absolute value that is greater than the value default, for example, "4". By extension, when the average required time is greater than the second reference, the controller can change the temperature decrease value (Δ) by a second altered value having an absolute value that is greater than the first altered value, for example, " 6 ". The fact that the average required time using the temperature decrease value (Δ) is greater than the reference time means that it takes a relatively long time to remove moisture because the amount of moisture contained in dirty clothing is too much. As a result, the absolute value of the temperature decrease value (Δ) is increased to perform drying sufficiently.
    For example, since the average required time (t6) is determined to be less than the first reference time after the average required time is compared with the first reference time in FIG. 8, the controller can control the heater to be turned off (S160). When the time taken for the vat surface temperature decreases to the preset temperature decrease value (Δ) from the highest temperature is less than the first reference time, it is determined that the amount of moisture contained in the garment dirty is relatively small and that drying is performed sufficiently.
    In the meantime, FIG. 9 is a graph illustrating the change in the surface temperature of the bowl according to a different degree of drying from the degree of drying of FIG. 8. Even in this case, the controller can calculate an average required time that is referred to as "t7" and the controller can compare the average required time (t7) with the first reference time (90 minutes). When the average required time (t7) is greater than the first reference time, the controller can recompense the average required time with a second reference time (for example, 240 minutes). In this case, when the average required time (t7) is greater than the first reference time and less than the second reference time, the controller can determine that a lot of humidity still remains and can readjust the temperature decrease value (Δ) to be a first changed value, for example, 4 from a default value. The controller can recalculate the average required time based on the changed temperature decrease value and the changed average required time is referred to as t8 in Fig. 9. From this, the controller can determine that the amount of moisture contained in the dirty clothing is reduced at an end point of the average required time (t8), in other words, in the time period when the surface temperature reaches the changed temperature decrease value (Δ), and then the controller can control the heater to be turned off. Substantially, Fig. 9 is a graph illustrating a change in the surface temperature of the tub in the event that a quantity of dirty clothing is at a medium level (eg 4 kg). The graph of FIG. 9 corresponds to the largest amount of dirty clothing, compared to the graph of FIG. 8 and then the average required time can be longer in FIG. 9.
    In the meantime, FIG. 10 is a graph illustrating a change in the surface temperature of the vat if the amount of dirty clothing is at a different quantity level, compared to FIGS. 8 and 9. Even in this case, the controller can calculate an average required time and the average required time can be referred to as "t9". The controller can compare the average required time (t9) with a first reference time (90 minutes). When the average required time (t9) is greater than the first reference time, the average required time can be compared with a second reference time (for example, 240 minutes). In this case, when the average required time (t9) is greater than the first reference time and the second reference time, the controller can determine that a large amount of moisture remains and can be readjusted to a temperature decrease value ( Δ) to be a second changed value, for example, "6" from a standard value. In that case, the controller can recalculate the average required time based on the changed temperature decrease value (Δ) and the changed average required time is referred to as "t10" in FIG. 10. From this, the controller can determine that the amount of moisture contained in dirty clothing is reduced in time when the surface temperature reaches the changed temperature decrease value (Δ) and that drying is performed sufficiently to control the heater to be turned off based on the determination result. Substantially, FIG. 10 is a graph illustrating the change in the surface temperature of the tub if the amount of dirty clothing is relatively large (for example, 7 kg or more). The graph of FIG. 10 corresponds to a large amount of dirty clothing, compared to the graphs of FIGS. 8 and 9. Because of this, the average time required may be longer.
    In the meantime, once the controller has determined that drying is complete, the controller can terminate the drying process by turning off the electrical power supplied to the dry duct heater 20. Here, the controller can additionally switch off the power supplied to the dry duct heater 20. , but it can keep the electrical energy supplied to the dry duct fan 20. This is because the heated air remaining in the dry duct has to be supplied to improve drying efficiency. By extension, when the air remaining in the dry duct is cooled to a normal temperature, the dirty clothing dried by the heated air can be cooled and the drying process can be completed simultaneously by providing normal temperature air. The delivery time of the air supplied for dirty clothing (the time when only the fan is turned on with the heater turned off) can be adjusted differently based on the amount of dirty clothing.
    Finally, the controller can perform a drying time recalculation step (S170). In other words, the controller can calculate the time period from the time the heater is turned on until the end of the average required time, such as an altered drying time. When the average required time is changed in the middle of the time as described with reference to FIGS. 8 to 10, the controller can calculate the time period until the end point of the average required time changed as the drying time. After that, the controller can display the changed drying time via the display part. As a result, the user can recognize a first drying time based on the amount of dirty clothing in accordance with this mode as the dirty clothing is triggered and he or she can recognize the actual trigger time required from the alteration of the temperature of the tank as the drying is performed.
    As below, a method of determining a degree of drying in a washing machine including the cooled air condensation medium will be described.
    FIG. 11 is a perspective view illustrating a bowl provided in a washing machine having a drying function in accordance with another embodiment of the present invention. FIG. 12 is a sectional view illustrating the bowl shown in FIG. 11 which is provided in a cabinet 10.
    Referring to FIGS. 11 and 12, the washing machine having the drying function according to another embodiment of the present invention may include cooled air condensation means 170 mounted on an outer circumferential surface of the tub 100 to cool an outer wall of the tub 100 when sucking external air from a cabinet 10 to make an internal surface of the bowl 100 employed as a condensing surface.
    Such a cooled air condensation means 170 includes a suction passage 171 in communication with one side of the cabinet 10 to suck out the external air from the cabinet 10 therein, an exhaust passage 175 formed on the other side of the cabinet 10 to exhaust the external air. that has undergone heat exchange with an outer circumferential surface of the outer tub 100 of the cabinet, and a condensation passageway 179 formed on the outer circumferential surface of the tub 100 to allow the external air sucked through the suction passageway 171 to be exhausted through the exhaust passage 175 after heat exchange as it flows along the outer circumferential surface of bowl 100.
    Here, the ventilation fan 176 is installed in the exhaust passage 175 to increase the amount of air and improve the efficiency of heat exchange through forced convection. A filter (not shown) and a grid 172 can be installed in an opening of the suction passage 171 to prevent foreign substances such as dust from being drawn into the suction passage 171.
    As the ventilation fan 176 of the cooled air-type condensing means 170 is operated while the drying process is performed, external air from the cabinet 10 can be forced into the suction passage 171 by force. The air sucked into the suction passage 171 is exhausted out of the cabinet 10 from the exhaust passage 175 through the condensation passage 179.
    At this time, the external air sucked into the suction passage 171 takes the heat out of the outer wall of the bowl 100, while flowing through the condensation passage 179 from the suction passage 171, to be exhausted outside the cabinet 10.
    In other words, the external air sucked into the suction passage 171 can cool an inner wall of the tub 100 through heat transfer with the outer wall of the tub 100, such condensate can be generated and this generated condensate can be drained through drain hole.
    In the meantime, a water level sensor 410, configured to detect the amount of wash water stored in bowl 100, can be provided on a drain line 400 along which the wash water and condensate are drained. When drainage is performed in the event that the cooled air-type condensation medium is provided, the water level sensor can detect the amount of condensate generated in the drying of dirty clothing.
    FIG. 13 is a perspective view illustrating a bowl provided in a washing machine having a drying function in accordance with an additional embodiment of the present invention. FIG. 14 is a sectional view illustrating the bowl of FIG. 13 in a state where it is mounted in a cabinet 10.
    Referring to FIGS. 13 and 14, cooled air-type condensation means may include a suction port 171a formed on one side of a cabinet 10 to suck outside air into the cabinet 10, an exhaust hole 175b formed on another opposite side of the cabinet to exhaust the external air that has undergone heat exchange with a circumferential surface of the tub outside the cabinet 10. Here, it is shown that the suction port 171a can be one of the right and left side surfaces of the cabinet 10 and that the exhaust port 175b can be formed on a rear surface of the cabinet 10, and the locations of the suction port 171a and the exhaust port 175b are not limited to them.
    Also, a ventilation fan 176 is installed in front of the suction port 171a to improve the amount of air and to cool an outer circumferential surface of the bowl 100 when using forced convection.
    Alternatively, a ventilation fan can be installed in front of the exhaust hole 175b. Here, the ventilation fan 176 is installed only in front of the suction port 171a according to this modality.
    Referring to FIG. 15, when the drying process is performed, the external air sucked through the suction port 171a can exchange heat with an entire area of the circumferential surface of the bowl 100, while passing through the entire area inside the cabinet, just to condense the air that dried the dirty clothes. Thereafter, condensate can be generated on a general internal circumferential surface of the bowl 100 and the condensate generated can be drained through the drain hole of the bowl 100.
    In the meantime, a water level sensor 410 can be provided on a drain line 400 where drain water and condensate are drained along, to detect the amount of wash water stored in tub 100, which is identical to the description mentioned above.
    As below, a method for determining the completion of drying the dirty clothing according to each of the modalities mentioned above will be described with reference to FIG. 15. Before making the description, the present invention relates to a method for determining the completion of drying dirty clothing. Because of this, detailed description having no relation to the subject of the present invention will be omitted.
    Referring to FIG. 15, the washing machine can detect the first amount of dirty clothing loaded in it to wash as a washing process begins (S110). The first amount of dirty clothing can be detected before water is supplied to the washing machine drum or the first amount of dirty clothing can be detected before a washing machine wash cycle is performed. Measuring a quantity of dirty clothing is a key element used to calculate the amount of washing water and the amount of detergent required to perform the wash. Commonly, the measurement of a quantity of dirty clothing can be performed on all types of washing machines. As a result, a method for measuring a quantity of dirty clothing will be omitted in the present invention.
    In the meantime, as the first amount of dirty clothing is detected, an amount of washing water and detergent determined based on the amount of dirty clothing can be provided to perform washing and rinsing (S120). Once the washing is complete, the washing water can be drained and centrifugation starts (S130).
    Once the washing and spinning of dirty clothing is complete, the second amount of dirty clothing that has been spun can be detected (S140). The second amount of dirty clothing can be detected after water is supplied to the washing machine drum or the second amount of the dirty clothing detection step can be detected before a washing machine drying cycle is performed. The second amount of dirty clothing detected in that time may include the weight of the dirty clothing itself and the amount of washing water contained in the dirty clothing (commonly, the washing water contained in the dirty clothing may not be completely removed in the spin).
    From this, before drying begins, the expected amount of condensate that will be generated during drying can be calculated (S150). Here, the expected amount of condensate can be defined as the amount of dirty clothing that remains after subtracting the first amount of clothing from the second amount of dirty clothing. In other words, the first amount of dirty clothing is the weight of the dirty clothing before washing starts, that is, the weight of dry dirty clothing and the second quantity of dirty clothing can be the weight of wet dirty clothing before drying if start, that is, dirty clothing containing moisture. As a result, when the first amount of dirty clothing is subtracted from the second amount of dirty clothing, the amount (or weight) of the moisture contained in the dirty clothing can be calculated and this calculated value can be defined as the expected amount of condensate. As a result, when the moisture corresponding to the expected amount of condensate is removed in the drying process, it can be determined that drying is complete.
    However, the expected amount of condensate can be adjusted to protect dirty clothing. For example, if the weight that remains after subtracting the first amount of dirty clothing from the second amount of dirty clothing is defined as the expected amount of condensate as it is, 100% drying can be performed for dirty clothing and over drying can be generated. Because of this, damage to dirty clothing can be generated. By extension, when calculating the amount of dirty clothing, it can be difficult to measure the amount of dirty clothing 100% precisely because of sensor errors and it can be difficult to define the remaining weight after subtracting the first amount of dirty clothing from the second amount of clothing. dirty clothing as the expected amount of condensate is as is. As a result, the controller can define as the expected amount of condensate an appropriate range of the remaining weight after subtracting the amount of the first garment from the second amount of dirty garments, for example, from 60% to 100%. The range can be preset and inserted into the controller or can be adjusted by user selection. Especially, if the user intends to iron dirty clothing after drying, the band can be adjusted less.
    Once the expected amount of condensate is calculated as mentioned above, the drying of dirty clothing can be performed (S 160). In this case, the condensate generated on the inner circumferential surface of the bowl 100 can flow along the inner wall of the bowl 100 to be exhausted through a wash water drain hole provided at the bottom of the bowl 100. At this time, the amount of drained condensate can be measured by the water level sensor 410 provided in the drain line 400 (S170).
    The measured condensate quantity can be compared with the expected condensate quantity (S180). Here, when the measured amount of condensate is less than the expected amount of condensate, it means that drying is not performed sufficiently and drying can be performed continuously. When the measured condensate quantity is identical to the expected condensate quantity, it is determined that drying is complete and drying is controlled to be completed (S190).
    In the meantime, a drainage method according to one embodiment of the present invention represents that the completion of drying is determined based on the amount of condensate calculated based on the comparison between the measured amount and the expected amount. However, the amount of condensate generated during drying can be measured constantly to determine a drying completion point, without calculating the calculation of the condensate quantity.
    In other words, condensate can be generated on the inner wall of the bowl 100 as the drying is performed. The condensate generated can flow along the inner wall of the tub into the drain hole where the wash water is drained. In the meantime, the water level sensor 410 can be provided on the drain line 400 connected with the drain hole to detect the amount of wash water and the water level sensor 410 can measure the amount of the condensate. As a result, the condensate generated during the drying process can be drained through the drain hole constantly and the water level sensor can measure the condensate constantly. The drying completion can be determined when a point at which the measured condensate quantity is drastically reduced (in other words, a preset value based on the amount of dirty clothing as a point for determining drain completion).
    According to the washing machine having the drying function and the drying method as described above, the outside air can be used to condense the air that has dried dirty clothing, without using cooling water. Because of this, water usage can be reduced. In addition, the drying completion point for dirty clothing can be determined relatively precisely when using the condensate.
    权利要求:
    Claims (13)
    [0001]
    1. Washing machine, comprising: a cabinet (10); a bowl (100) attached to the cabinet; a drum (300) pivotally provided in the bowl; a dry duct (20) configured to heat the exhaust air from the tub to a predetermined temperature, to replenish the heated air to the tub; and a cooled air type condensing unit (170; 171 a, 175b, 176) configured to condense moisture in at least a predetermined area of an internal circumferential surface of the bowl (100) through heat exchange of the outside air of the cabinet with at least the predetermined area of an external circumferential surface of the tub (100), the washing machine characterized by the fact that it additionally comprises: a controller (30) configured to calculate an expected amount of condensate that will be generated during drying by by subtracting a first quantity of dirty clothing from a second quantity of dirty clothing, where the first quantity of dirty clothing is the weight of dry dirty clothing detected before the start of a washing cycle and in which the second quantity dirty clothing is an amount of dirty clothing detected after a drying cycle has been performed; and a detection unit (410) configured to detect the amount of condensate generated in the bowl (100), in which the drying completion is determined by comparing a detected amount of condensate with the expected amount of condensate.
    [0002]
    2. Washing machine according to claim 1, characterized by the fact that a heater (21), which heats the air, and a ventilation fan (22), which ventilates the air, are provided in the dry duct.
    [0003]
    Washing machine according to any one of claims 1 to 2, characterized in that the detection unit (410) is a water level sensor that detects the amount of condensate stored in the tub.
    [0004]
    A washing machine according to any one of claims 1 to 3, characterized in that the condensed unit of the cooled air type comprises: a suction passage (171) that sucks out the external air of the cabinet; a condensation passage (179) that guides the air towards at least the predetermined outer circumferential surface of the bowl; and an exhaust passage (175) that exhausts the air having passed through the condensation passage.
    [0005]
    5. Washing machine according to claim 4, characterized by the fact that a ventilation fan (176) that ventilates the air is provided in the exhaust passage.
    [0006]
    A washing machine according to any one of claims 1 to 3, characterized by the fact that the condensing unit of the cooled air type comprises: a suction orifice (171a) provided in the cabinet to suck out the external air from the cabinet in it; and an exhaust hole (175b) provided in the cabinet to exhaust air inside the cabinet from the outside.
    [0007]
    7. Washing machine, according to claim 6, characterized by the fact that it additionally comprises: a ventilation fan (176) provided in at least one of the suction and exhaust holes.
    [0008]
    8. Washing machine according to any one of claims 1 to 7, characterized by the fact that one end of the dry duct is connected to a heated air outlet (51) that collects air inside the tub for the duct dry and the other end of the dry duct is connected to a heated air outlet hole that supplies air to the tub.
    [0009]
    Washing machine according to claim 8, characterized by the fact that the heated air outlet hole (51) is provided in an upper rear portion of the tub and the heated air outlet hole is provided in one portion upper front of the vat.
    [0010]
    10. Washing machine according to claim 9, characterized by the fact that the heated air outlet hole is located in front of an opening formed in the drum.
    [0011]
    Washing machine according to any one of claims 1 to 10, characterized in that it additionally comprises: a rod (351) connected to the drum; a support housing (400), which swivels the rod; a motor that turns the rod; and a suspension unit connected to the support housing, to suspend the vibration of the drum.
    [0012]
    Washing machine according to any one of claims 1 to 11, characterized in that it additionally comprises: 5 a drive part comprising a rod (351) connected to the drum, a support housing (400), which supports rotating the rod, and a motor, which rotates the rod; and a sealing member, which seals a rear portion of the tub (100) to prevent water from leaking into the actuation part from the tub, the sealing member, which allows the actuation part to move relatively with respect to to the vat.
    [0013]
    13. Washing machine according to any one of claims 1 to 12, characterized in that it additionally comprises: a suspension unit, which supports the drum (300), in which the bowl 15 (100) is supported by the unit suspension system more rigidly than the drum (300) is supported by the suspension unit.
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    同族专利:
    公开号 | 公开日
    RU2013122797A|2014-11-27|
    EP2630289A4|2017-11-08|
    EP2630289A1|2013-08-28|
    AU2011318852A1|2013-05-23|
    CN103210134B|2016-06-29|
    WO2012053751A1|2012-04-26|
    US9133575B2|2015-09-15|
    AU2011318852B2|2015-07-09|
    RU2544828C9|2015-11-10|
    CN103210134A|2013-07-17|
    EP2630289B1|2018-12-05|
    RU2544828C2|2015-03-20|
    US20130219741A1|2013-08-29|
    ES2713956T3|2019-05-24|
    BR112013009447A2|2016-08-09|
    KR20120088034A|2012-08-08|
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    法律状态:
    2018-04-03| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-06-04| B06T| Formal requirements before examination [chapter 6.20 patent gazette]|
    2020-06-16| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-10-06| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 30/09/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    KR10-2010-0101760|2010-10-19|
    KR1020100101760A|KR20120088034A|2010-10-19|2010-10-19|laundry machine having a drying function|
    PCT/KR2011/007232|WO2012053751A1|2010-10-19|2011-09-30|Washing machine and control method thereof|
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