Cooking utensils

Abstract

This utility model provides a cooking appliance, comprising: a pot body, including an outer shell, a middle plate, and a power board assembly, wherein the middle plate is located at the upper end of the outer shell, the power board assembly is located below the middle plate, and the power board assembly includes a power board bracket and a power board mounted on the power board bracket; and a lid, pivotally connected to the pot body; wherein the middle plate has a cable passage located above the power board bracket, and a first waterproof plate is provided on the middle plate, located inside the cable outlet of the cable passage, with its lower end protruding downward from the cable outlet of the cable passage; the power board bracket is provided with an upwardly extending second waterproof plate, located inside the first waterproof plate, with the top of the second waterproof plate being higher than or flush with the bottom of the first waterproof plate, and the power board located inside the second waterproof plate. The technical solution provided by this application can solve the problem of water ingress and damage to the power board assembly in related technologies.

Description

Technical Field

[0001] This utility model relates to the field of small household appliance technology, and more specifically, to a cooking utensil. Background Technology

[0002] Electric pressure cookers work by using the principle that the boiling point of a liquid is raised under higher pressure, allowing water to reach a higher temperature without boiling, thus speeding up the cooking process.

[0003] In related technologies, an electric pressure cooker includes a pot body and a lid. The control panel and exhaust mechanism are located on the lid, and the rear of the lid is pivotally connected to the pot body. A power board assembly that supplies power to the entire machine is located at the rear of the pot body, and a wire passage is provided at the upper end of the pot body for wires to pass through. One end of the wire is electrically connected to the power board assembly, and the other end of the wire is electrically connected to the control panel.

[0004] However, when the lid is opened, condensation and other liquids on the lid will flow to the top of the pot. These liquids can easily drip through the wiring channel onto the power board assembly, causing damage to the power board assembly. Utility Model Content

[0005] This invention provides a cooking appliance to solve the problem of water ingress and damage to the power board assembly in related technologies.

[0006] This utility model provides a cooking appliance, comprising: a pot body, including an outer shell, a middle plate, and a power board assembly, wherein the middle plate is located at the upper end of the outer shell, the power board assembly is located below the middle plate, and the power board assembly includes a power board bracket and a power board disposed on the power board bracket; and a lid, pivotally connected to the pot body; wherein the middle plate has a cable passage located above the power board bracket, and a first waterproof plate is disposed on the middle plate, the first waterproof plate being located inside the cable outlet of the cable passage, the lower end of the first waterproof plate protruding downward from the cable outlet of the cable passage; the power board bracket is provided with an upwardly extending second waterproof plate, the second waterproof plate being located inside the first waterproof plate, the top of the second waterproof plate being higher than or flush with the bottom of the first waterproof plate, and the power board being located inside the second waterproof plate.

[0007] By applying the technical solution of this utility model, and by setting a first waterproof plate on the middle plate and a second waterproof plate on the power board bracket, the problem of water ingress and damage to the power board assembly in related technologies is effectively solved. Specifically: Since the first waterproof plate is located inside the cable outlet of the cable passage, and its lower end protrudes downward from the cable outlet, the first waterproof plate forms a first layer of waterproof structure. Since the second waterproof plate is located inside the first waterproof plate, and its top is higher than or flush with the bottom of the first waterproof plate, and the power board is located inside the second waterproof plate, the second waterproof plate forms a second layer of waterproof structure. With the above structure, water dripping from the cable passage will flow sequentially through the first and second waterproof plates, and will not drip directly onto the power board assembly below the cable outlet. Instead, it will be guided to other non-electronic component areas, preventing water from directly entering the power board area, thereby greatly reducing the risk of short circuits caused by water ingress into the power board. Therefore, the combined use of the first and second waterproof plates forms a double protective wall, effectively preventing condensate and other liquids from dripping onto the power board assembly through the cable passage.

[0008] Furthermore, the second waterproof membrane has a water-guiding channel, which surrounds the inner side of the first waterproof membrane. The water-guiding channel guides condensate and other liquids along a predetermined path to drain, preventing them from dripping directly onto the power board and further enhancing waterproofing performance.

[0009] Furthermore, the second waterproof membrane includes a membrane body and two first water-retaining ribs, which are located on both sides of the membrane body, forming a water-guiding channel together with the membrane body. This method of using the first water-retaining ribs and the membrane body to form the water-guiding channel effectively collects and guides condensate and other liquids, preventing them from spreading laterally to other areas. Moreover, this method of using the first water-retaining ribs and the membrane body to form the water-guiding channel has the advantages of simple structure and ease of processing.

[0010] Furthermore, the second waterproof membrane includes a waterproof membrane segment and a water-guiding segment. The waterproof membrane segment is located inside the first waterproof membrane, and the water-guiding segment has an inwardly extending arc-shaped water-guiding surface, which is positioned below the first waterproof membrane. The waterproof membrane segment prevents water flowing down from the first waterproof membrane from flowing to other locations, and the water-guiding segment with its arc-shaped water-guiding surface smoothly guides the water to a predetermined location.

[0011] Furthermore, the first waterproof plate includes a first and a second water-proof rib that are spaced apart and extend downwards. The tops of the first and second water-proof ribs are connected to form a downward-opening steam collection chamber. With this structure, water vapor can enter the steam collection chamber, condense, and flow out, reducing damage to the power board from water vapor, significantly improving waterproof performance, and ensuring the long-term stable operation of the power board.

[0012] Furthermore, the first water-proof rib protrudes downwards from the second water-proof rib. The first water-proof rib is located inside the outlet of the cable passage, and the second water-proof rib is located between the first water-proof rib and the second waterproof membrane. With this structure, when water slides onto the first waterproof membrane, the water will naturally fall and flow away under its own gravity, reducing the probability of the water flow area becoming larger.

[0013] Furthermore, the power board bracket is equipped with two vertically extending second water-blocking ribs, located below the second waterproof membrane and on either side of it. By setting the vertical second water-blocking ribs on the power board bracket, a physical barrier is formed, preventing condensate and other liquids from flowing laterally to other areas, significantly improving the waterproofing effect and ensuring the long-term stable operation of the power board.

[0014] Furthermore, the power board bracket is equipped with a third water-blocking rib extending laterally, with both ends of the third water-blocking rib connected to the lower ends of the two second water-blocking ribs, respectively. The third water-blocking rib can further restrict the flow range of water and improve the waterproof effect.

[0015] Furthermore, a first cable clamp is provided on the side wall of the power board bracket away from the power board, located below the cable passage. A second cable clamp is provided on the side of the power board bracket, higher than the first cable clamp. The first and second cable clamps standardize the wiring path, ensure standardized operation, and improve cable retention. Moreover, by positioning the second cable clamp higher than the first, a height difference is created, preventing condensation and other liquids from flowing from the cables onto the power board, further enhancing waterproofing.

[0016] Furthermore, the pot body also includes a heat-insulating cover, the upper end of which rests on the upper surface of the middle plate. A sealing strip is sandwiched between the upper surface of the middle plate and the upper end of the heat-insulating cover, extending circumferentially along the middle plate and positioned above the power board. By setting a sealing strip between the middle plate and the heat-insulating cover, a sealed space is formed, effectively preventing the penetration of liquids such as condensation during long-term use. This avoids condensation and other liquids dripping from the gap between the middle plate and the heat-insulating cover onto the power board, providing all-around protection for the power board and improving the overall performance of the cooking appliance and the user experience. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A cross-sectional view of the cooking appliance provided in an embodiment of the present invention is shown;

[0019] Figure 2 It shows Figure 1 A magnified view of a section at point A in the middle;

[0020] Figure 3 A schematic diagram of the structure of the cooking appliance provided in an embodiment of the present invention is shown;

[0021] Figure 4 An exploded view of the cooking appliance provided in an embodiment of the present invention is shown;

[0022] Figure 5 An exploded view of the cooking appliance provided in an embodiment of the present invention is shown;

[0023] Figure 6 An exploded view of the cooking appliance provided in an embodiment of the present invention is shown;

[0024] Figure 7 A schematic diagram of the structure of the middle plate of the cooking appliance provided in this embodiment of the present invention is shown;

[0025] Figure 8 A schematic diagram of the structure of the middle plate of the cooking appliance provided in this embodiment of the present invention is shown;

[0026] Figure 9 A schematic diagram of the structure of the cooking appliance provided in an embodiment of the present invention is shown.

[0027] The above figures include the following reference numerals:

[0028] 10. Pot body; 11. Outer shell; 12. Middle plate; 121. Cable passage; 1211. Cable outlet; 122. First waterproof plate; 1221. First water-proof rib; 1222. Second water-proof rib; 1223. Steam collection chamber; 123. Mounting groove; 13. Power board assembly; 131. Power board bracket; 1311. Second waterproof plate; 1312. Water guide groove; 1313. Plate body; 1314. First water-blocking rib; 1315. Waterproof plate segment; 1316. Water guide plate segment; 1317. Arc-shaped water guide surface; 132. Power board; 133. Second water-blocking rib; 134. Third water-blocking rib; 135. First cable clamp; 136. Second cable clamp; 14. Insulation cover; 141. Support ring;

[0029] 20. Cover;

[0030] 30. Sealing strip. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0032] like Figures 1 to 9 As shown, this embodiment of the present invention provides a cooking appliance, which includes a pot body 10 and a lid 20. The pot body 10 includes an outer shell 11, a middle plate 12, and a power board assembly 13. The middle plate 12 is located above the outer shell 11, and the power board assembly 13 is located below the middle plate 12. The power board assembly 13 includes a power board bracket 131 and a power board 132 disposed on the power board bracket 131. The lid 20 is pivotally connected to the pot body 10. The middle plate 12 has a cable passage 121 located above the power board bracket 131. A first waterproof plate 122 is disposed on the middle plate 12. The first waterproof plate 122 is located inside the cable outlet 1211 of the cable passage 121, and the lower end of the first waterproof plate 122 protrudes downward from the cable outlet 1211 of the cable passage 121. The power board bracket 131 is provided with an upwardly extending second waterproof plate 1311. The second waterproof plate 1311 is located inside the first waterproof plate 122. The top of the second waterproof plate 1311 is higher than or flush with the bottom of the first waterproof plate 122. The power board 132 is located inside the second waterproof plate 1311.

[0033] Using the cooking appliance provided in this embodiment, since the first waterproof plate 122 is located inside the outlet 1211 of the wiring channel 121, and the lower end of the first waterproof plate 122 protrudes downward from the outlet 1211 of the wiring channel 121, the first waterproof plate 122 forms a first layer of waterproof structure. Since the second waterproof plate 1311 is located inside the first waterproof plate 122, and the top of the second waterproof plate 1311 is higher than or flush with the bottom of the first waterproof plate 122, and the power board 132 is located inside the second waterproof plate 1311, the second waterproof plate 1311 forms a second layer of waterproof structure. With the above structure, water dripping from the wiring channel 121 will flow sequentially through the first waterproof plate 122 and the second waterproof plate 1311, and will not drip directly onto the power board assembly 13 below the outlet 1211. Instead, it will be guided to other non-electronic component areas, preventing water from directly entering the power board area, thereby greatly reducing the risk of short circuits caused by water ingress into the power board 132. Therefore, the combined use of the first waterproof plate 122 and the second waterproof plate 1311 forms a double protective wall, forming a brim-shaped protective structure to catch condensate and other liquids, allowing condensate and other liquids to flow from the preset path to the base and be discharged, effectively preventing condensate and other liquids from dripping onto the power board assembly 13 through the wire passage 121, effectively improving the safety and reliability of the cooking appliance.

[0034] It should be noted that in this embodiment, the inner and outer sides are relative to the inner and outer sides of the pot body 10. For details, please refer to [link / reference needed]. Figure 1 The inward and outward directions.

[0035] In this embodiment, the top of the second waterproof membrane 1311 is higher than the bottom of the first waterproof membrane 122, resulting in better protection.

[0036] The wires of electrical components such as the operation panel on the cover 20 pass through the wire passage 121 and are electrically connected to the power board assembly 13 disposed inside the pot body 10.

[0037] like Figure 4 As shown, the second waterproof plate 1311 has a water guiding groove 1312, and the second waterproof plate 1311 is surrounded on the inner side of the first waterproof plate 122 through the water guiding groove 1312. The water guiding groove 1312 uses its structure to guide liquids such as condensate to drain along a preset path, preventing condensate and other liquids from dripping directly onto the power board 132, thus further enhancing the waterproof performance.

[0038] In this embodiment, the second waterproof membrane 1311 includes a membrane body 1313 and two first water-blocking ribs 1314. The two first water-blocking ribs 1314 are located on both sides of the membrane body 1313, and the two first water-blocking ribs 1314 and the membrane body 1313 together form a water-guiding groove 1312. By using the first water-blocking ribs 1314 and the membrane body 1313 to form the water-guiding groove 1312, it is possible to effectively collect and guide liquids such as condensate, preventing them from spreading laterally to other areas.

[0039] Furthermore, the method of using the first water-blocking rib 1314 and the plate body 1313 to form the water guide groove 1312 has the advantages of simple structure and easy processing.

[0040] like Figure 2 As shown, the second waterproof membrane 1311 includes a waterproof membrane segment 1315 and a water-guiding segment 1316. The waterproof membrane segment 1315 is located inside the first waterproof membrane 122, and the water-guiding segment 1316 has an inwardly extending arc-shaped water-guiding surface 1317, which is located below the first waterproof membrane 122. The waterproof membrane segment 1315 prevents water flowing down from the first waterproof membrane 122 from flowing to other locations, and the water-guiding segment 1316 with the arc-shaped water-guiding surface 1317 can smoothly guide the water to a predetermined location.

[0041] like Figure 2 , Figure 5 as well as Figure 8 As shown, in this embodiment, the first waterproof plate 122 includes a first waterproof rib 1221 and a second waterproof rib 1222 that are spaced apart and extend downwards. The tops of the first waterproof rib 1221 and the second waterproof rib 1222 are connected to form a downward-opening steam collection chamber 1223. With the above structure, water vapor can enter the steam collection chamber 1223, condense, and flow out, reducing the damage of water vapor to the power board 132, significantly improving the waterproof performance, and ensuring the long-term stable operation of the power board 132.

[0042] Specifically, both the first water-proof rib 1221 and the second water-proof rib 1222 are U-shaped ribs. The combination of the first water-proof rib 1221 and the second water-proof rib 1222 can form a double-layer U-shaped structure, which can effectively block and collect liquids such as condensate, preventing them from entering the power board 132 area through the wire passage 121.

[0043] In some embodiments, the first waterproof rib 1221 or the second waterproof rib 1222 can abut against the second waterproof membrane 1311 to reduce the risk of moisture ingress.

[0044] Specifically, the first water-proof rib 1221 protrudes downwards from the second water-proof rib 1222. The first water-proof rib 1221 is located inside the outlet 1211 of the wire passage 121, and the second water-proof rib 1222 is located between the first water-proof rib 1221 and the second waterproof membrane 1311. With this structure, when water slides onto the first waterproof membrane 122, the water will naturally fall and flow away under its own gravity, reducing the probability of the water flow area becoming larger.

[0045] like Figure 4 As shown, in this embodiment, the power board bracket 131 is provided with two vertically extending second water-blocking ribs 133, which are located below the second waterproof plate 1311 and on both sides of the second waterproof plate 1311. By providing vertical second water-blocking ribs 133 on the power board bracket 131, a physical barrier is formed to prevent condensate and other liquids from flowing laterally to other areas, significantly improving the waterproof effect and ensuring the long-term stable operation of the power board 132.

[0046] The power board bracket 131 is provided with a third water-blocking rib 134 extending laterally, with both ends of the third water-blocking rib 134 connected to the lower ends of the two second water-blocking ribs 133 respectively. The third water-blocking rib 134 can further restrict the flow range of water and improve the waterproof effect.

[0047] like Figure 4 As shown, a first wire-clamping component 135 is provided on the side wall of the power board bracket 131 away from the power board 132. The first wire-clamping component 135 is located below the wire passage 121, and a second wire-clamping component 136 is provided on the side of the power board bracket 131. The first wire-clamping component 135 and the second wire-clamping component 136 can standardize the wiring path of the wires, ensure standardized operation, and improve the fixing effect of the wires.

[0048] In this embodiment, the second cable clamp 136 is higher than the first cable clamp 135. By positioning the second cable clamp 136 higher than the first cable clamp 135, a height difference is created, preventing liquids such as condensation from flowing from the wires onto the power board 132, thus further enhancing the waterproof effect.

[0049] like Figure 2As shown, in this embodiment, the pot body 10 also includes a heat insulation cover 14. The upper end of the heat insulation cover 14 rests on the upper surface of the middle plate 12. A sealing strip 30 is sandwiched between the upper surface of the middle plate 12 and the upper end of the heat insulation cover 14. The sealing strip 30 extends circumferentially along the middle plate 12 and is located above the power board 132. By setting the sealing strip 30 between the middle plate 12 and the heat insulation cover 14, a sealed space is formed, effectively preventing the penetration of liquids such as condensate during long-term use. This avoids liquids such as condensate dripping from the gap between the middle plate 12 and the heat insulation cover 14 onto the power board 132, providing all-round protection for the power board 132 and improving the overall performance of the cooking appliance and the user experience.

[0050] Specifically, a support ring 141 is provided at the upper end of the heat insulation cover 14. The upper end of the heat insulation cover 14 is supported on the upper surface of the middle plate 12 through the support ring 141. A sealing strip 30 is sandwiched between the upper surface of the middle plate 12 and the lower surface of the support ring 141.

[0051] like Figure 4 As shown, the upper surface of the middle plate 12 is provided with a mounting groove 123, the lower part of the sealing strip 30 is embedded in the mounting groove 123, and the upper part of the sealing strip 30 is in contact with the lower surface of the support ring 141.

[0052] Among them, sealing strip 30 is a flexible sealing strip.

[0053] In this embodiment, the power board 132 is located on the side of the power board bracket 131 facing the inside of the pot.

[0054] Cooking appliances include, but are not limited to, electric pressure cookers, rice cookers, and multi-functional cookers.

[0055] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0056] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0057] In the description of this utility model, it should be understood that "multiple" means two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0058] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0059] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model.

[0060] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cooking appliance characterized by, The cooking appliance includes: The pot body (10) includes an outer shell (11), a middle plate (12) and a power board assembly (13). The middle plate (12) is located at the upper end of the outer shell (11), and the power board assembly (13) is located below the middle plate (12). The power board assembly (13) includes a power board bracket (131) and a power board (132) disposed on the power board bracket (131). The lid (20) is pivotally connected to the pot body (10); The middle plate (12) has a cable passage (121) located above the power board bracket (131), and a first waterproof plate (122) is provided on the middle plate (12). The first waterproof plate (122) is located inside the cable outlet (1211) of the cable passage (121), and the lower end of the first waterproof plate (122) protrudes downward from the cable outlet (1211) of the cable passage (121). The power board bracket (131) is provided with an upwardly extending second waterproof plate (1311), the second waterproof plate (1311) is located inside the first waterproof plate (122), the top of the second waterproof plate (1311) is higher than or flush with the bottom of the first waterproof plate (122), and the power board (132) is located inside the second waterproof plate (1311).

2. The cooking appliance of claim 1, wherein, The second waterproof membrane (1311) has a water guide groove (1312), and the second waterproof membrane (1311) is arranged inside the first waterproof membrane (122) through the water guide groove (1312).

3. The cooking appliance of claim 2, wherein, The second waterproof membrane (1311) includes a membrane body (1313) and two first water-blocking ribs (1314). The two first water-blocking ribs (1314) are located on both sides of the membrane body (1313), and the two first water-blocking ribs (1314) and the membrane body (1313) together form the water guide groove (1312).

4. The cooking appliance of claim 1, wherein, The second waterproof membrane (1311) includes a waterproof membrane segment (1315) and a water-guiding segment (1316). The waterproof membrane segment (1315) is located inside the first waterproof membrane (122). The water-guiding segment (1316) has an inwardly extending arc-shaped water-guiding surface (1317), and the arc-shaped water-guiding surface (1317) is disposed below the first waterproof membrane (122).

5. The cooking appliance of claim 1, wherein, The first waterproof membrane (122) includes a first water-proof rib (1221) and a second water-proof rib (1222) that are spaced apart and extend downward. The tops of the first water-proof rib (1221) and the second water-proof rib (1222) are connected to form a downward-opening steam collection cavity (1223).

6. The cooking appliance of claim 5, wherein, The first water-proof rib (1221) protrudes downward from the second water-proof rib (1222). The first water-proof rib (1221) is located inside the outlet (1211) of the wire passage (121). The second water-proof rib (1222) is located between the first water-proof rib (1221) and the second waterproof plate (1311).

7. The cooking appliance according to any one of claims 1 to 6, characterized in that, The power board bracket (131) is provided with two vertically extending second water-blocking ribs (133), which are located below the second waterproof plate (1311) and on both sides of the second waterproof plate (1311).

8. The cooking appliance of claim 7, wherein, The power board bracket (131) is provided with a third water-blocking rib (134) extending laterally, and the two ends of the third water-blocking rib (134) are respectively connected to the lower ends of the two second water-blocking ribs (133).

9. The cooking appliance according to any one of claims 1 to 6, characterized in that, A first wire-holding component (135) is provided on the side wall of the power board bracket (131) away from the power board (132). The first wire-holding component (135) is located below the wire passage (121). A second wire-holding component (136) is provided on the side of the power board bracket (131). The second wire-holding component (136) is higher than the first wire-holding component (135).

10. The cooking appliance according to any one of claims 1 to 6, characterized in that, The pot body (10) also includes a heat insulation cover (14), the upper end of which is attached to the upper surface of the middle plate (12). A sealing strip (30) is sandwiched between the upper surface of the middle plate (12) and the upper end of the heat insulation cover (14). The sealing strip (30) extends circumferentially along the middle plate (12) and is located above the power board (132).

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