• 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:
    A water heater comprising: a burner (2); a heat exchanger (3); an inlet conduit (4) configured to supply sanitary water from a water network (15) to the heat exchanger (3); an outlet conduit (5) configured to supply sanitary water leaving the heat exchanger (3) to one or more users (16); connecting a bypass duct (6; 106) the inlet duct (4) and the outlet duct (5), the bypass duct (6; 106) being configured to supply a controlled flow of domestic water. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2633130A2
    申请号:ES201730333
    申请日:2017-03-15
    公开日:2017-09-19
    发明作者:Antonio PIA；Noé CIOFOLO；Stefano Casiraghi
    申请人:Riello SpA；
    IPC主号:
    专利说明:

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    DESCRIPTION WATER HEATER
    The present invention relates to a water heater. In particular, the present invention relates to a water heater for domestic use.
    Water heaters for domestic use are boilers designed to heat water for sanitary use.
    Generally, water heaters are equipped with a burner and a heat exchanger fed with sanitary water from the water network and configured to transfer part of the thermal energy produced by the burner to the water flowing in the heat exchanger .
    The circulation of water in the heat exchanger occurs thanks to the pressure in the water network in case of a demand by a user, for example, when a tap or a shower, etc., is opened.
    This circulation stops immediately when the demand by the end user, that is, when the tap or shower, etc., closes.
    When the circulation in the heat exchanger stops, all residual heat is transferred to the domestic water stored in the heat exchanger, dangerously increasing its temperature.
    In this case, the temperature of the sanitary water often exceeds 100 ° C and a user who opens a tap will probably burn it.
    In order to avoid these drawbacks, the known water heaters are provided with a pipe, which surrounds the combustion chamber that houses the burner and the heat exchanger. This pipe is supplied with cold water from the water network. In this way, the water temperature is reduced to levels that are not dangerous for the user.
    However, this solution is very expensive, both for the cost of the material used and for the manufacturing process.
    Therefore, an object of the present invention is to provide a water heater that is free from the above-mentioned drawbacks of the prior art. In particular, an object of the present invention is to provide a water heater that allows to overcome the above-mentioned drawbacks in a simple and low cost manner, both from a functional and structural point of view.
    In accordance with these objects, the present invention relates to a water heater according to revindication 1.
    Other features and advantages of the present invention will become apparent from the following description of a non-limiting realization with reference to the Figures in the attached drawings, in which:
    - Figure 1 is a schematic block representation, with parts removed for the sake of clarity, of a water heater according to the present invention in a first operational configuration;
    - Figure 2 is a schematic block representation, with parts removed for the sake of clarity, of the water heater of Figure 1 in a second operational configuration;
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    - Figure 3 is a schematic block representation, with parts removed for the sake of clarity, of a water heater in accordance with the present invention according to a first variant;
    - Figures 4a and 4b are schematic representations, with parts in section and parts removed for the sake of clarity, of a detail of the water heater of Figure 3 in two different operation configurations;
    - Figures 5a and 5b are schematic representations, with parts in section and parts removed for the sake of clarity, of a detail of the water heater of Figure 3 according to a variant and in two different operation configurations;
    - Figures 6a and 6b are schematic representations, with parts in section and parts removed for the sake of clarity, of a detail of the water heater of Figure 3 according to an additional variant and in two different operation configurations.
    Figure 1 shows a simplified block diagram of a water heater 1 for the production of domestic hot water.
    The water heater 1 comprises a burner 2, a heat exchanger 3 coupled to the burner 2, an inlet duct 4, an outlet duct 5 and a bypass duct 6.
    The burner 2 is preferably a gas burner provided with a plurality of nozzles (not shown in the attached Figures) and fed by a gas supply conduit 9 connected to a gas distribution network 10 and provided with a supply valve 11 .
    A control device 12 regulates the supply valve 11.
    The exchanger 3 is configured to transfer part of the thermal energy produced by the burner 2 to the domestic water circulating in the heat exchanger 3.
    In particular, the inlet duct 4 is configured to supply the heat exchanger 3 with sanitary water from a water network 15, while the outlet duct 5 is configured to supply hot water exiting the heat exchanger 3 to one or more users 16.
    Water from water network 15 is pressurized.
    Users 16 are generally appliances such as faucets, showers, etc.
    The bypass conduit 6 connects the inlet conduit 4 and the outlet conduit 5.
    In particular, the bypass duct 6 is configured to provide a controlled flow of sanitary water passively.
    In the non-limiting example shown in Figure 1, the bypass duct 6 has a cross section sized to provide the desired flow of sanitary water.
    In the non-limiting example described and shown here, the section of the bypass duct 6 is such as to provide a flow rate equal to 12-18% of the flow that flows into the outlet duct 5. Preferably, the section of the bypass duct 6 it is such as to provide a flow equal to 15% of the flow flowing in the outlet duct 5.
    Preferably, the water heater 1 also comprises a temperature sensor 18 configured to detect the temperature of the hot water leaving the
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    heat exchanger 3.
    In particular, the temperature sensor 18 is arranged to detect the temperature of the domestic water at a point upstream of the connection point between the outlet duct 5 and the bypass duct 6.
    In this way, the temperature sensor 18 is not affected by the mixing with the domestic cold water from the bypass duct 6.
    Thanks to this, the temperature sensor 18 also provides a safety function by limiting the temperature of the hot water circulating in the heat exchanger 3, thus guaranteeing the safety system in all conditions.
    The temperature data detected by the temperature sensor 18 is supplied to the control device 12.
    The control device 12 is configured to regulate the supply valve 11 for the gas supply to the burner 2 based on the temperature detected by the temperature sensor 18 upstream of the connection point with the bypass duct 6 and based on the flow rate supplied by the bypass duct 6.
    In other words, the control device 12 detects the continuous mixing between the domestic hot water leaving the heat exchanger 3 and the domestic cold water supplied by the bypass duct 6 and increases the amount of gas supplied to the burner 2 in order of compensating the effect of temperature decrease due to the mixing and guaranteeing sanitary water at the desired temperature to the users 16.
    During use, when users 16 activate a supply request, that is, for example when a tap is opened (configuration of Figure 1), the burner 2 is activated, a flow of water from the water network 15 is it supplies the heat exchanger 3 and a predetermined flow rate is supplied to the bypass duct 6.
    The domestic hot water leaving the heat exchanger 3 is mixed with the domestic cold water from the bypass duct 6 and then supplied to the users 16.
    As already described above, the control device 12 will take into account the reduction of the temperature due to the mixing of the hot water of the outlet duct 5 with the cold water of the bypass duct, thereby regulating the discharge valve 11 accordingly .
    Figure 1 shows by way of example only the values of the water temperature at different points of the water heater 1 in the case where users 16 require a domestic water temperature of 60 ° C.
    If the users are not active 16 and do not require the supply of hot water (configuration of Figure 2), the burner 2 is turned off and no sanitary cold water is supplied from the water network 15.
    However, a certain amount of water remains in the circuit comprising the inlet conduit 4, the bypass conduit 6, the outlet conduit 5 and the heat exchanger 3.
    In this configuration, the presence of the bypass duct 6 favors the circulation of water in the inlet duct 4, in the bypass duct 6, in the outlet duct 5 and in the heat exchanger 3.
    In the non-limiting example described here and shown, in the absence of any demand for flow by the users 16, a circulation is activated in the heat exchanger 3
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    in the opposite direction with respect to the circulation that occurs when users 16 require a certain flow rate. As indicated by the arrow in Figure 2, in fact, water is passed through the bypass duct 6, the outlet duct 5, the heat exchanger 3 and the inlet duct 4.
    The circulation of water in the absence of any demand for flow by the users 16 prevents any unwanted overheating of the domestic water in the heat exchanger 3 and produces a homogeneous water temperature in the hydraulic circuit of the water heater 1.
    Figure 2 shows by way of example only the water temperature values at different points of the water heater 1 in the case where the users 16 are not active.
    Figure 3 shows a water heater 100 according to a variant of the present invention. The water heater 100 differs from the water heater 1 in that the bypass line 106 is provided with a flow regulator 108 configured to limit the flow rate supplied through the bypass line 6 to a desired value.
    The flow regulator 108 is configured so as to limit the flow rate supplied through the bypass conduit 106 based on the water pressure upstream of the flow regulator 108.
    In other words, the flow regulator 108 regulates the flow rate supplied through the bypass conduit 106 passively.
    In the non-limiting example described and shown here, the flow regulator 108 is a gravitational flow regulator.
    Preferably, the outlet duct 5 has a portion 107 (shown schematically in Figure 3 and best seen in Figures 3 and 4) that has a reduced pitch section.
    Bypass conduit 106 opens along this portion 107.
    Thanks to the reduction of the section in the portion 107, a depression in the bypass duct 106 proportional to the flow rate flowing in the outlet duct 5 is generated by the Venturi effect. As described in more detail below, this depression favors the operation of the flow regulator 108 under certain operating conditions.
    With reference to Figures 4a and 4b, the flow regulator 108 is configured:
    • to allow the passage of a minimum flow rate when the pressure upstream of the flow regulator 108 is lower than a minimum threshold value;
    • to close the passage section of the bypass line 106 when the pressure upstream of the flow regulator 108 exceeds a maximum threshold value;
    • to allow the flow of a flow proportional to the water pressure upstream of the flow regulator 108 when the pressure upstream of the flow regulator 108 is between the minimum threshold value and the maximum threshold value.
    In the non-limiting example described and represented here, the flow regulator 108 comprises a chamber 109 arranged along the bypass conduit 106 and a shutter 110 that can move within the chamber 109.
    The chamber 109 has an inlet 112 coupled to the portion of the bypass conduit 106 connected to the inlet conduit 4 and an outlet 113 coupled to the portion of the conduit
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    bypass 106 connected to outlet duct 5. At outlet 113, chamber 109 is provided with three fins 115 configured to keep shutter 110 at a certain distance from chamber walls 109 and to prevent complete closure at the entrance 112 when the upstream pressure of the flow regulator 108 is less than a minimum threshold value.
    During use, when the pressure upstream of the flow regulator 108 is less than a minimum threshold value (configuration of Figure 4a), the particular structure of the flow regulator allows the passage of a minimum flow at the inlet 112. This normally It occurs in the absence of any demand for flow by users. Thanks to the passage of the minimum flow, the circulation of water in the inlet duct 4, in the bypass duct 6, in the outlet duct 5 and in the heat exchanger 3 is activated.
    When the upstream pressure of the flow regulator of 108 exceeds a maximum threshold value, the shutter 110 completely closes the outlet 113 of the chamber 109, thus blocking! the passage of water through the bypass conduit 106 (the configuration of Figure 4b) and avoiding any mixing between the sanitary cold water in the bypass conduit 106 and the domestic hot water in the outlet conduit 5. This occurs when the Flow demand by users is high. In this case, the movement of the shutter 110 towards the outlet 113 is also favorable by the depression generated by the reduction of section in the portion 107 of the outlet duct 5.
    Advantageously, this solution makes it possible to avoid any mixing between the domestic cold water in the bypass line 106 and the domestic hot water in the outlet line
    5 when mixing with sanitary cold water is not necessary to lower the temperature.
    When the pressure upstream of the flow regulator 108 is between the minimum threshold value and the maximum threshold value, the shutter 110 is in an intermediate position in the chamber 109 (configuration shown in broken lines in Figure 4a), which allows the passage through the bypass conduit 106 of a flow rate proportional to the water pressure upstream of the flow regulator 108. In particular, the shutter 110 is shaped so as to allow the flow of a flow rate preferably equal to 30% of the flow rate flowing in the inlet conduit 4 or in the outlet conduit 5. Thanks to the particular shape of the flow regulator 108, it is possible to increase the mixing ratio between the water coming from the bypass conduit 106 and the outlet conduit 5 with with respect to the mix ratio usable in the solution shown in Figures 1 and 2. In the solution with a derivation
    6 without a flow regulator, the mixing ratio is preferably 15%, while in the solution with a derivation 106 provided with a flow regulator 108 the mixing ratio is doubled (30%).
    Figures 5a and 5b show a flow regulator 138 according to a variant.
    Also the flow regulator 138, analogous to the flow regulator 108, is configured so as to limit the flow rate supplied through the bypass conduit 106 based on the water pressure upstream of the flow regulator 138.
    In other words, the flow regulator 138 regulates the flow supplied through the bypass conduit 106 passively.
    According to this embodiment, the flow regulator 138 comprises a shutter 140 provided with a through channel 141, configured to ensure the passage of a minimum flow even when the pressure upstream of the flow regulator 138 is less than the minimum threshold value ( configuration of Figure 5a), and the shutter 140 is fully butted against the input 112.
    When the pressure upstream of the flow regulator 138 is between the minimum threshold value and the maximum threshold value, the shutter 140 is in a position
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    intermediate in chamber 109 (configuration shown in broken lines in Figure 5A) to allow passage through the bypass conduit 106 of a flow proportional to the water pressure upstream of the flow regulator 138.
    When the upstream pressure of the flow regulator 138 exceeds the maximum threshold value, the shutter 140 moves fully against the outlet 113, thereby preventing passage on the sides of the shutter 140, and the through channel 141 is blocked by a respective sealing element 145 of the chamber 109 arranged at the outlet 113. In this way, the passage of water through the bypass conduit 106 is blocked.
    Figures 6a and 6b show a flow regulator 158 according to an additional variant.
    Also the flow regulator 158, analogous to the flow regulator 108, is configured so as to limit the flow rate supplied through the bypass conduit 106 based on the water pressure upstream of the flow regulator 158.
    In other words, the flow regulator of 158 regulates the flow rate supplied through the bypass conduit 106 passively.
    According to this embodiment, the flow regulator 158 comprises a shutter 160 having a substantially T-shaped channel 161 configured to ensure the passage of a minimum flow even when the pressure upstream of the flow regulator 158 is less than the value minimum threshold (configuration of Figure 6a), and shutter 160 is arranged in contact against input 112.
    When the pressure upstream of the flow regulator 158 is between the minimum threshold value and the maximum threshold value, the shutter 160 is in an intermediate position in the chamber 109 (configuration not shown in the attached Figures), to allow the passage to through the bypass line 106 of a flow rate proportional to the water pressure upstream of the flow regulator 158.
    When the pressure upstream of the flow regulator 158 exceeds the maximum threshold value, the shutter 160 moves fully against the outlet 113, thus blocking! the passage of the sanitary water through the bypass duct 106. A variant not shown in the present invention establishes that, in the operation configuration, the bypass duct is disposed above the heat exchanger favoring the circulation of the sanitary water when the Burner is off and there is no demand from users. This activates a natural circulation phenomenon thanks to which the water in the heat exchanger, which is hotter and less dense than that contained in the bypass duct, tends to increase, thus giving! step to the cooler which, in turn, heats up when entering the heat exchanger.
    Advantageously, the water heater 1, 100 according to the present invention has a simplified and less expensive structure compared to the structure of known water heaters and ensures at the same time that the water temperature does not overheat when the burner It is off and there is no demand from users.
    The bypass duct 6, 106 is, in fact, configured to provide a controlled flow of sanitary water in a passive manner. The expression "passive form" means without the help of any flow regulator actively controlled by a control system, for example, based on the values detected by the sensors arranged downstream and / or above the branch or along the branch and analyzed by a control device. The actively controlled flow regulators are, for example, pumps and / or adjustment valves, etc.
    Basically, bypass duct 6, 106 configured in accordance with the present
    Invention can supply a controlled flow of sanitary water independently and without the help of any dedicated control system. In this way, the production costs of the water heater according to the present invention are significantly reduced with respect to the manufacturing costs of the water heaters of the prior art.
    Finally, it is evident that the water heater described herein may be subject to modifications and variations without departing from the scope of the appended claims.
    权利要求:
    Claims (12)
    [1]
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    1. A water heater comprising: a burner (2);
    a heat exchanger (3);
    an inlet conduit (4) configured to supply sanitary water from a water network (15) to the heat exchanger (3);
    an outlet duct (5) configured to supply sanitary water from the heat exchanger (3) to one or more supply outlets (16);
    a bypass duct (6; 106), which connects the inlet duct (4) with the outlet duct (5); the bypass duct (6; 106) being configured to deliver a controlled flow of sanitary water.
    [2]
    2. Water heater according to claim 1, wherein the section of the bypass duct (6) is sized to provide a controlled flow of sanitary water.
    [3]
    3. Water heater according to claim 1, wherein the bypass line (106) is provided with a flow regulator (108; 138; 158) configured to allow the passage of a controlled flow of sanitary water.
    [4]
    4. Water heater according to claim 3, wherein the flow regulator (108; 138; 158) is configured to allow the passage of a sanitary water flow proportional to the sanitary water pressure upstream of the flow regulator ( 108; 138; 158) when the pressure upstream of the flow regulator (108; 138; 158) is between a minimum threshold value and a maximum threshold value.
    [5]
    5. Water heater according to claim 3 or 4, wherein the flow regulator (108; 13 8; 158) is configured to allow the passage of a minimum flow of sanitary water when the pressure upstream of the flow regulator ( 108; 138; 158) is less than a minimum threshold value.
    [6]
    6. Water heater according to any one of claims 3 to 5, wherein the flow regulator (108; 138; 158) is configured to block the passage of sanitary water through the bypass conduit (106) when the Pressure upstream of the flow regulator (108; 138; 158) is greater than a maximum threshold value.
    [7]
    7. Water heater according to any one of claims 3 to 6, wherein the flow regulator (108; 138; 158) is provided with a chamber (109) arranged so that the flow of sanitary water passes through in the bypass duct (106) and a shutter (110; 140) that can be moved in the chamber (109).
    [8]
    8. Water heater according to claim 7, wherein the chamber (109) has an inlet (112) coupled to a portion of the bypass conduit (106) connected to the inlet conduit (4); the chamber (109) being provided with a plurality of fins (115) configured to keep the shutter (110) at a certain distance from the walls of the chamber (109) to allow the minimum flow rate to pass.
    [9]
    9. Water heater according to claim 7, wherein the plug (140; 160) is provided with a channel (141; 161) to allow the minimum flow rate to pass through.
    [10]
    10. Water heater according to any one of the preceding claims, wherein the bypass duct (6; 106) is disposed above the heat exchanger (3) in an operational configuration.
    [11]
    Water heater according to any one of the preceding claims, wherein the outlet duct (5) has a portion (107) that has a reduced passage section, the bypass duct (106) opening in this portion (107) ).
    [12]
    12. Method for the operation of a water heater according to any one of the preceding claims, which comprises feeding a flow rate
    Control of sanitary water in a passive way through the bypass duct (6; 106).
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    法律状态:
    2018-09-06| FG2A| Definitive protection|Ref document number: 2633130 Country of ref document: ES Kind code of ref document: B1 Effective date: 20180906 |
    优先权:
    申请号 | 申请日 | 专利标题
    ITUA2016A001733A|ITUA20161733A1|2016-03-16|2016-03-16|WATER HEATER|
    IT102016000027764|2016-03-16|
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