• 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:
    apparatus for preparing food the invention relates to an apparatus (100) for preparing food. the apparatus comprises a food preparation chamber (101) having an external wall (102), an air heating system for circulating hot air (103) within the food preparation chamber (101), an air cooling system for circulating cold air (104) on said external wall (102) outside the food preparation chamber (102), a thermal fuse system (105) to cut off the electricity supply of said device when the temperature of the thermal fuse system ( 105) exceeds a given limit (th), the thermal fuse system (105) being fixed to said external wall (102) outside the food preparation chamber (101), a cover element (106) placed in the vicinity of said thermal fuse system (105) to protect the thermal fuse system (105) from cold air. the invention improves the thermal protection of the device.
    公开号:BR112016021221B1
    申请号:R112016021221-5
    申请日:2015-02-27
    公开日:2021-03-30
    发明作者:Marcel SLADECEK；Davide Bonaccorso
    申请人:Koninklijke Philips N.V.；
    IPC主号:
    专利说明:

    Field of invention
    [001] The invention relates to an apparatus for preparing food.
    [002] The invention can be used in the field of kitchen appliances. Background of the invention
    [003] Air fryers are known for cooking food, for example, french fries or chicken, the heat for preparing food being provided by hot air. To heat the food to be prepared and cooked, a stream of hot air, or a stream of hot air, is generated to circulate around the food arranged in a food preparation chamber.
    [004] For the comfort and safety of the user, this type of appliance is generally equipped with an air cooling system that generates cold air outside and around the food preparation chamber to keep the outside of the appliance below a certain level. temperature.
    [005] This type of air-based fryers is also equipped with a thermal fuse system that cuts off the electricity supply in the event that a defect in the appliance causes an excessive increase in temperature above a given value. In order to better detect an excessive rise in temperature, the thermal fuse system is, in general, placed in direct contact with an external wall of the food preparation chamber, outside the food preparation chamber.
    [006] Although the thermal fuse system fully plays its role of cutting off the appliance's electricity supply in the event of an excessive temperature rise, the performances of this type of air-based fryers in relation to thermal protection could still be improved.
    [007] The patent published under number EP1772086 A1 discloses a heated appliance having a removable bowl to which a thermal sensor and a thermal fuse are attached by means of respective arms. The respective thermal devices comprise an NTC thermistor located inside the NTC tube, while the thermal fuse comprises a thermal cut fuse located inside the fuse tube. The respective thermal devices have a pair of terminals for connection to an appliance connection / control interface. By permanently attaching the respective thermal devices to the base or to a side wall of the removable bowl, consistent performance of the thermostat and thermal fuse can be achieved, regardless of how often the removable bowl is removed and reinserted in the appliance, ensuring, thus, consistent long-term performance. Purpose and summary of the invention
    [008] It is an objective of the invention to propose an apparatus for preparing food having an improved thermal protection.
    [009] The invention is defined by the independent claims. The dependent claims define advantageous modalities.
    [0010] For this purpose, an apparatus for preparing food is proposed, the apparatus comprising: - a food preparation chamber having an external wall, - an air heating system for circulating hot air within the food preparation chamber. - an air cooling system for circulating cold air in said external wall outside the food preparation chamber, - a thermal fuse system to cut off the electricity supply of said appliance when the temperature of the thermal fuse system exceeds one given threshold, the thermal fuse system being fixed to said external wall outside the food preparation chamber, - a cover element placed in the vicinity of said thermal fuse system to protect the thermal fuse system from cold air.
    [0011] The use of a cover element placed in the vicinity of said thermal fuse system prevents the cold air from blowing into the thermal fuse system itself and prevents the thermal fuse from having a thermally lower temperature. As a result, if a defect in the device causes an excessive rise in temperature above a given value, the temperature of the thermal fuse system will rise faster which, in turn, will result in the power supply of the device being cut off faster.
    [0012] In addition, with these types of air-based fryers, it may happen that when the user stops the appliance after use, the temperature of the thermal fuse system will continue to rise due to the transfer of heat accumulated in the structure of the appliance for the thermal fuse system. The thermal fuse system can therefore be damaged with the need for replacement.
    [0013] Detailed explanations and other aspects of the invention will be provided below. Brief description of the drawings
    [0014] The particular aspects of the invention will now be explained with reference to the modalities described below in this document and considered together with the accompanying drawings, in which identical parts or substeps are designated in the same way: Figure 1A, Figure 1B and Figure 1C represent a first, second and third apparatus, according to the invention, respectively, Figure 2A and Figure 2B represent a first and a second simplified electrical diagrams of an apparatus, according to the invention, respectively, Figures 3A-3B-3C-3D represent views of a cover element forming a deflector used in an apparatus, according to the invention, Figures 4A-4B-4C represent views of a cover element forming a cavity used in an apparatus, according to the invention, Figure 5 represents a cover element forming a capsule, used in an apparatus, according to the invention. Detailed description of the invention
    [0015] Figure 1A represents an apparatus 100, according to the invention.
    [0016] The apparatus comprises a food preparation chamber 101 with an outer wall 102.
    [0017] The apparatus also comprises an air heating system for circulating hot air 103 within the food preparation chamber 101. For example, the air heating system comprises an electric heating element 107, a fan 108 and a motor 109. The motor 109 turns the fan 108, which creates a circulation of air that is heated by the heating element 107. As a result, the hot air 103 is generated in the food preparation chamber. The heating element 107 can correspond, for example, to a resistive heating element or a halogen lamp.
    [0018] The apparatus also comprises an air cooling system for circulating cold air 104 on the outer wall 102 outside the food preparation chamber 101. Cold air means air having a much lower temperature than hot air 103, like air at room temperature. For example, the air cooling system comprises an engine, such as engine 109 and fan 110. Engine 109 rotates fan 110, which creates an air circulation between the outer wall 111 and the outer wall 102. The air , for example, enters inputs E1 and E2 and exits outputs O1 and O2. The cold air that is circulated outside and around the food preparation chamber 101 prevents the outer wall 111 from reaching too high a temperature that could be dangerous for the user.
    [0019] The apparatus also comprises a thermal fuse system 105 to cut the electricity supply of the apparatus when the temperature of the fuse exceeds a given threshold TH. The thermal fuse system 105 is attached to the outer wall 102 outside the food preparation chamber 101. For example, the thermal fuse system is attached via a strap (not shown). The thermal fuse system comprises at least one thermal fuse (also called "temperature fuse" or "thermal cut"), preferably inserted in the electrical outlet of the device. For example, a thermal fuse composed of a fuse alloy with a low melting point and special resin, encapsulated in a plastic or ceramic housing, can be used. Under normal operation of the device, the fuse alloy is joined by the two conductive wires inside the housing. When the thermal break detects abnormal heat and reaches a pre-set temperature TH, the fuse alloy melts and disconnects the circuit completely with the help of the special resin. For the sake of clarity, the electrical connection of the thermal fuse system is not shown. Other types of thermal fuse, known as such, could be used.
    [0020] The apparatus also comprises a cover element 106 placed in the vicinity of said thermal fuse system 105 to protect thermal fuse system 105 from cold air 104. Cover element 106 prevents the incoming cold air 104 from blowing directly into the thermal fuse system 105. For example, if the appliance is an appliance, the cover 106 is a distance of a few millimeters to a few centimeters from the thermal fuse system 105.
    [0021] As shown in Figure 1A, the thermal fuse system 105 can be placed in an upper part of the external wall 102. Considering that the heat, in its majority, propagates from the bottom to the top, this position of the thermal fuse 105 allows faster detection of an excessive temperature rise in the event of a device defect. Alternatively, as shown in Figure 1B, the thermal fuse system 105 is placed on a side of the outer wall 102.
    [0022] Regarding the use of this device, the food portions 113 are placed in a lower support 112. Access to the inside of the food preparation chamber 101 and the food portions 113, for example, is through a drawer mechanism that opens on one side of the appliance (not shown). Preferably, the lower support 112 is provided with a plurality of openings, indicated by a dashed line, so that hot air can circulate around the food portions 113.
    Alternatively, as shown in Figure 1C, the apparatus 100 additionally comprises the air guide means 114. The air guide means 114 is intended to guide the hot air 103 to the lower bottom support. For example, the air guide means 114 is formed by the space between the outer wall 102 and the wall 115 of the food basket in which the food portions 113 are placed. Optionally, an air guide element 116 is placed below the lower support 112 so that hot air flows upwards in the food portions below.
    [0024] With this type of apparatus, the hot air flow 103 is provided with a high speed and high flow rate in the food preparation chamber 101, for example, with an air flow rate of 20 liters per second. The term "hot air" refers to an air temperature in the range of [60 ° C; 250 ° C].
    [0025] Figure 2A represents a first simplified electrical diagram of an appliance, according to the invention. The power supply U is applied to the device. For example, it corresponds to 220 volts AC. The thermal fuse system 105 is placed at the entrance and in series so that if the thermal fuse system is activated, it cuts off the electricity supply of the device. A SW key is also inserted in series, so that the user can start or stop the device. The closing of the SW switch closes the electrical circuit and allows the supply of electricity to the heating element 107 and the motor 109. The thermal fuse system 105 comprises a thermal fuse F1 that opens the electrical circuit when the temperature exceeds a fixed threshold. For example, thermal fuse F1 is chosen with a cut-off temperature of 176 ° C.
    [0026] Figure 2B represents a second simplified electrical diagram of an appliance, according to the invention. In comparison with the electrical diagram of Figure 2A, it differs in that the thermal fuse system 105 comprises a second thermal fuse F2 placed in series at the entrance of the second power supply of the apparatus. Thermal fuse F1 and thermal fuse F2 preferably have the same cut-off temperature. If the thermal fuse system 105 is activated, thermal fuse F1 and thermal fuse F2 open each input of the device's power supply, resulting in better electrical insulation of the device and more safety for the user.
    [0027] Advantageously, as shown in Figure 3A, the cover element 106 forms a baffle 301. The shape of the baffle 301 is preferably flat with, for example, a square, rectangular or triangular shape. Figure 3B represents the corresponding three-dimensional view of the baffle 301. The front and side sides are open, which is advantageous for connecting the electrical cables (not shown) to the thermal fuse system 105. Figure 3C represents a corresponding exploded view showing the thermal fuse system 105. Alternatively, as shown in Figure 3D, deflector 301 has a longitudinal curved cross section to slightly increase the space between deflector 301 and outer wall 102, for example, to match the size of the thermal fuse system 105 and, at the same time, offer low aerodynamic air resistance.
    [0028] Advantageously, as shown in Figure 4A, the cover element 106 forms a cavity 401. Having a cover element forming a cavity allows for better insulation of the air from the thermal fuse system 105 from the cold air 104. Only the front side is open, which is advantageous for connecting the electrical cables (not shown) to the thermal fuse system 105. Alternatively, as shown in Figure 4B, cavity 401 has a curved cross section to offer low aerodynamic air resistance. Figure 4C represents a corresponding exploded view showing the thermal fuse system with a first thermal spindle F1 and a second thermal spindle F2.
    [0029] Advantageously, as shown in Figure 5, the cover element 106 forms a closed cap 501. This shape allows hermetic insulation of the thermal fuse system 105. The electrical cables (not shown) need to be connected to the thermal fuse system 105 or below the capsule or through holes made in the capsule wall.
    [0030] The covering element 106 has a geometry (ie, shape) defining a certain volume of air between the covering element 106 and the outer wall 102. That volume of air corresponds to the volume below the covering element, delimited by projection of the perimeter of the covering element 106 on the outer wall 102. The greater this volume, the less sensitive the thermal fuse system 105 is in relation to the cold air 104 circulating in the apparatus. On the other hand, the lower this volume, the more sensitive the thermal fuse system 105 is in relation to the cold air 104 circulating in the apparatus. For a given thermal fuse system 105 having a fixed cut-off temperature, in this way, it is possible to adjust the temperature of the apparatus in which the thermal fuse system 105 will actually be activated. For example, if the thermal fuse system 105 has a fixed cut-off temperature at 172 ° C, reducing the volume of air between the cover element 106 and the outer wall 102 will tend to increase the temperature of the thermal fuse system 105 and, as a result, the thermal fuse system 105 can be activated faster and reduce the risk to the consumer.
    [0031] Preferably, if the appliance is an appliance, the cover element 106 has a geometry defining an air volume between the cover element 106 and the outer wall 102 in the range [1 cm3; 30 cm3].
    [0032] The covering element 106 is preferably made of material resistant to the temperature of the apparatus 100 after the activation action of the thermal fuse system 105. For example, the covering element 106 is made of silicone or steel.
    [0033] The modalities above as described are merely illustrative and are not intended to limit the technical approaches of the present invention. Although the present invention is described in detail with reference to the preferred embodiments, those skilled in the art will understand that the technical approaches of the present invention may be modified or equally substituted without departing from the scope of the technical approaches of the present invention, which will also fall within the scope protector of the claims of the present invention. In the claims, the expression “that comprises” does not exclude other elements or other stages, and the indefinite article “one” or “one” does not exclude a plurality. No reference sign in the claims should be construed as limiting the scope of the invention.
    权利要求:
    Claims (11)
    [0001]
    1. APPLIANCE (100) FOR PREPARING FOOD, comprising: - a food preparation chamber (101) having an external wall (102); and - an air heating system for circulating hot air (103) within the food preparation chamber (101); - a thermal fuse system (105) for cutting the electricity supply of said apparatus when the temperature of the thermal fuse system (105) exceeds a given threshold (TH), the thermal fuse system (105) being fixed to said wall external (102) outside the food preparation chamber (101); and characterized by further comprising: - an air cooling system for circulating air (104) in said external wall (102) outside the food preparation chamber (102); and - a cover element (106) placed in the vicinity of said thermal fuse system (105) to protect the thermal fuse system (105) from cold air.
    [0002]
    APPLIANCE according to claim 1, characterized in that the cover element (106) forms a deflector (301).
    [0003]
    Apparatus according to claim 1, characterized in that the cover element (106) forms a cavity (401) with closed side sides.
    [0004]
    APPLIANCE according to claim 1, characterized in that the cover element (106) forms a closed capsule (501).
    [0005]
    Apparatus according to any one of claims 1 to 4, characterized in that the cover element (106) has a geometry defining an air volume between the cover element and the outer wall in the range [1 cm3; 20 cm3].
    [0006]
    APPLIANCE according to any one of claims 1 to 5, characterized in that the thermal fuse system (105) is placed in an upper part of said external wall (102).
    [0007]
    Apparatus according to any one of claims 1 to 6, characterized in that the thermal fuse system (105) is placed on a side of said external wall (102).
    [0008]
    Apparatus according to any one of claims 1 to 7, characterized in that the cover element (106) is made of material resistant to the temperature of the device (100) after the activation action of the thermal fuse system (105).
    [0009]
    Apparatus according to any one of claims 1 to 8, characterized in that the cover element (106) is made of silicone.
    [0010]
    Apparatus according to any one of claims 1 to 9, characterized in that the cover element (106) is made of steel.
    [0011]
    11. Apparatus according to any one of claims 1 to 10, characterized in that the thermal fuse system (105) comprises a first and a second thermal fuse (F1, F2) to cut a first and a second power supply input from the device, respectively.
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    引用文献:
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    KR101931366B1|2012-07-20|2018-12-21|삼성전자주식회사|Oven|JP6438604B2|2015-06-29|2018-12-19|コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ．|Apparatus for preparing food including an air cooling system|
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    法律状态:
    2020-02-11| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-01-26| B09A| Decision: intention to grant|
    2021-03-30| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 27/02/2015, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP14160445|2014-03-18|
    EP14160445.4|2014-03-18|
    PCT/EP2015/054178|WO2015139934A1|2014-03-18|2015-02-27|Apparatus for preparing food having an improved thermal protection|
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