Cooking utensil

Abstract

The utility model provides a cooking utensil which comprises a base assembly, the base assembly comprises a heating assembly, an electric device, an annular supporting frame and a bottom shell, the heating assembly is arranged on the supporting frame, the supporting frame is arranged on the bottom shell, and a first blocking rib is arranged on the side, facing the bottom shell, of the supporting frame; a second blocking rib is arranged on the side, facing the supporting frame, of the bottom wall of the bottom shell, and the first blocking rib and the second blocking rib are partially overlapped in the vertical direction and arranged at intervals in the horizontal direction. The first blocking rib is located outside the second blocking rib, and the electric device is arranged in an area close to the supporting frame and the side, away from the heating assembly, of the first blocking rib; or the first blocking rib is located on the inner side of the second blocking rib, and the electric device is arranged in the area close to the bottom wall of the bottom shell and the side, away from the heating assembly, of the second blocking rib. The first blocking rib and the second blocking rib can prolong the path for transferring heat generated by the heating assembly to the electric device and isolate and absorb part of the heat, so that the heat flowing from the heating assembly to the electric device is reduced, and the normal service life of the cooking utensil is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of small household appliances, in particular to a cooking utensil. Background Art

[0002] Some cooking appliances, such as electric hot pots, generally include a heating component and a base component. The heating component is disposed on the base component and forms a closed cavity with the base component. Electrical components and wires are located in the cavity.

[0003] When the heating component is working, the heat will usually be quickly transferred to the wires or electrical components, causing the wires or some electrical components to be overheated, which can easily cause damage and reduce their service life. Utility Model Content

[0004] In view of this, it is necessary to provide a cooking utensil to address the above problems, which can reduce the temperature of the assembly area of ​​the electrical components, thereby ensuring the normal service life of the cooking utensil.

[0005] The utility model provides a cooking utensil, comprising a base assembly and a pot body, wherein the pot body is placed on the base assembly, and the base assembly comprises: a heating assembly; an electrical component; an annular support frame; and a bottom shell, wherein the heating assembly is mounted on the support frame, and the support frame is arranged on the bottom shell, wherein a first retaining rib is arranged on a side of the support frame facing the bottom shell; a second retaining rib is arranged on a side of the bottom wall of the bottom shell facing the support frame, the first retaining rib and the second retaining rib are partially overlapped in the vertical direction, and are spaced apart in the horizontal direction; wherein the first retaining rib is located on the outside of the second retaining rib, and the electrical component is arranged in an area close to the support frame and a side of the first retaining rib away from the heating assembly; or the first retaining rib is located on the inside of the second retaining rib, and the electrical component is arranged in an area close to the bottom wall of the bottom shell and a side of the second retaining rib away from the heating assembly.

[0006] In the above-mentioned cooking appliance, the heat generated by the heating component needs to be diverted between the second barrier rib and the first barrier rib before it can be transferred to the electrical device, thereby extending the heat dissipation path of the heat generated by the heating component to the electrical device, and the first barrier rib and the second barrier rib will also isolate and absorb part of the heat, thereby reducing the heat flowing from the heating component toward the electrical device, lowering the temperature of the electrical device, avoiding damage to the electrical device due to temperature increase, and ensuring the safety of the cooking appliance and the normal service life of the cooking appliance.

[0007] In one embodiment, a distance between the first retaining rib and the second retaining rib in a horizontal direction is L, and L is ≥ 5 mm.

[0008] Such an arrangement limits the horizontal spacing between the first barrier rib and the second barrier rib, thereby preventing the spacing between the two from being too small, resulting in poor heat dissipation and excessively high bottom shell temperature.

[0009] In one embodiment, the overlapping length of the first retaining rib and the second retaining rib in the vertical direction is H1, and H1≥10 mm.

[0010] With such arrangement, the greater the overlapping length H1 of the first barrier rib and the second barrier rib in the vertical direction, the longer the heat dissipation path for transferring the heat generated by the heating component to the assembly area, the less heat transferred to the assembly area, and the lower the temperature in the assembly area.

[0011] In one embodiment, the bottom surface of the heating assembly is located at a height lower than the top surface of the second barrier rib.

[0012] With this arrangement, the heat radiated downward by the heating component needs to be turned in sequence at the end of the second baffle away from the bottom shell and the end of the first baffle away from the support frame before it can enter the assembly area, thereby extending the heat dissipation path for the heat generated by the heating component to be transferred to the assembly area.

[0013] In one of the embodiments, the bottom shell includes a shell and a bottom plate connected to the shell, and the shell is snap-connected to the bottom plate.

[0014] In this way, the bottom shell is set as a split structure to facilitate production and processing, and the shell and the bottom plate can be made of different materials; the buckle has a simple structure, which is convenient for assembling the shell and the bottom plate, and also convenient for disassembling and repairing other components inside the bottom shell, while also ensuring the stability and reliability of the connection between the shell and the bottom plate in the assembled state.

[0015] In one of the embodiments, the shell includes a side wall portion and a hollow bottom wall portion, and the bottom plate is mounted on the bottom wall portion; one of the bottom plate and the bottom wall portion is provided with a buckle, and the other is provided with a block that cooperates with the buckle.

[0016] With such arrangement, the bottom wall of the shell can reduce the size of the bottom plate, as long as the bottom plate can cover the bottom surface of the heating component, thereby reducing production costs.

[0017] In one of the embodiments, the second retaining rib is disposed on the bottom plate, the buckle is disposed on the outer peripheral wall of the second retaining rib, and the clamping block is disposed on the bottom wall.

[0018] With such an arrangement, the heat generated by the heating assembly needs to first pass through the end of the second baffle away from the bottom plate before coming into contact with the shell, thereby reducing the temperature at the shell and avoiding damage to the shell.

[0019] In one of the embodiments, the base plate is made of a material selected from the group consisting of PET, PBT and PA; and / or the shell is made of a PP material.

[0020] With this arrangement, PET, PBT and PA materials have better heat resistance to ensure that the base plate will not be damaged in a high temperature environment for a long time; PP material has higher strength and lower cost.

[0021] In one embodiment, the heating component includes: a heating plate; a heating tube fixedly mounted on the heating plate, the heating tube including a tube body section and a lead-out section, the tube body section is embedded in the heating plate, and the lead-out section protrudes from the heating plate; and an electrical terminal fixedly mounted on the lead-out section, the maximum distance between the electrical terminal and the plate surface of the heating plate in the vertical direction is less than or equal to 30 mm.

[0022] Such a configuration can reduce the overall thickness of the heating assembly, making it easier for users to store and pick up food; at the same time, the heat at the bottom of the heating plate can be dissipated through the heat dissipation channel formed by the first rib and the second rib, avoiding the cables or electrical components in the bottom shell being in a high temperature environment for a long time due to the low heat dissipation rate.

[0023] In one of the embodiments, the heating assembly further comprises a reflective cover, wherein the reflective cover is disposed below the heating plate, and a heat insulating sheet is disposed between the reflective cover and the bottom shell.

[0024] In this configuration, the reflective cover is used to reflect the heat radiated downward by the heating plate toward the pot body to reduce heat loss and improve the cooking effect; the insulation sheet can reduce the heat transferred downward from the heating component, and at the same time prevent the wires passing through the bottom shell from being damaged by contact with the high-temperature reflective cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional schematic diagram of the base assembly provided in the utility model;

[0026] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0027] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of the middle support frame;

[0028] Figure 4 for Figure 1 A schematic diagram of the three-dimensional structure of the middle shell;

[0029] Figure 5 for Figure 1 Schematic diagram of the three-dimensional structure of the midsole plate.

[0030] Figure numerals: 10, heating component; 11, heating plate; 12, reflecting cover; 13, heating tube; 131, tube body section; 132, lead-out section; 14, power terminal; 20, supporting frame; 21, first retaining rib; 30, bottom shell; 31, second retaining rib; 32, shell; 321, side wall; 322, bottom wall; 33, bottom plate; 34, buckle; 35, block; 40, assembly area; 50, thermal insulation sheet. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0034] Some cooking appliances, such as electric hot pots, usually include a heating component and a base component. The heating component is arranged on the base component and forms a closed cavity with the base component. The electrical components and wires are located in the cavity. When the heating component is working, the heat is usually quickly transferred to the wires or electrical components, causing the wires or some electrical components to be overheated, which is easy to cause damage and reduce the service life.

[0035] In order to solve the above problems, Figures 1 to 5 As shown, the present application provides a cooking utensil that can reduce the temperature of the assembly area of ​​the electrical components, thereby ensuring the normal service life of the cooking utensil.

[0036] like Figure 1As shown, specifically, the cooking utensil includes a base assembly and a pot body (not shown), the pot body is placed on the base assembly, the base assembly includes a heating assembly 10, an electrical component, an annular support frame 20 and a bottom shell 30, the heating assembly 10 is mounted on the support frame 20, the support frame 20 is arranged on the bottom shell 30, wherein a first retaining rib 21 is provided on the side of the support frame 20 facing the bottom shell 30; a second retaining rib 31 is provided on the bottom wall of the bottom shell 30 facing the support frame 20, the first retaining rib 21 and the second retaining rib 31 are partially overlapped in the vertical direction, and are spaced apart in the horizontal direction; wherein the first retaining rib 21 is located on the outside of the second retaining rib 31, and the electrical component is arranged in an area close to the support frame 20 and the side of the first retaining rib 21 away from the heating assembly; or the first retaining rib 21 is located on the inside of the second retaining rib 31, and the electrical component is arranged in an area close to the bottom wall of the bottom shell 30 and the side of the second retaining rib 31 away from the heating assembly.

[0037] When the first barrier rib 21 is located on the outside of the second barrier rib 31, the first barrier rib 21, the top surface of the support frame 20 and the side walls of the bottom shell 30 form an assembly area 40 for accommodating electrical components, and the heat generated by the heating component 10 needs to be diverted at the second barrier rib 31 and the first barrier rib 21 in turn before it can enter the assembly area 40; when the first barrier rib 21 is located on the inside of the second barrier rib 31, the second barrier rib 31, the bottom wall of the bottom shell 30 and the side walls of the bottom shell 30 form an assembly area 40 for accommodating electrical components, and the heat generated by the heating component 10 needs to be diverted at the first barrier rib 21 and the second barrier rib 31 in turn before it can enter the assembly area 40.

[0038] In the cooking utensil provided by the embodiment of the utility model, the first barrier rib 21 and the second barrier rib 31 are located between the heating component 10 and the electrical device, and the two have an overlapping area in the vertical direction, so that the heat generated by the heating component 10 cannot directly enter the assembly area 40, but needs to be diverted between the second barrier rib 31 and the first barrier rib 21 before entering the assembly area 40, thereby extending the heat dissipation path a for the heat generated by the heating component 10 to be transferred to the electrical device, and the first barrier rib 21 and the second barrier rib 31 will also isolate and absorb part of the heat, thereby reducing the heat flowing from the heating component 10 toward the assembly area 40, lowering the temperature of the electrical device, avoiding damage to the electrical device due to temperature increase, and ensuring the safety of the cooking utensil and the normal service life of the cooking utensil.

[0039] Among them, the first retaining rib 21 and the second retaining rib 31 can be an annular structure concentric with the base assembly, that is, the assembly area 40 is an annular area surrounded by the first retaining rib 21 or the second retaining rib 31 and the side wall of the bottom shell 30; or the first retaining rib 21 and the second retaining rib 31 can be provided only in the area where the electrical components are installed, that is, the assembly area 40 is an arc-shaped area surrounded by the first retaining rib 21 or the second retaining rib 31 and the side wall of the bottom shell 30.

[0040] like Figure 1 As shown, the horizontal spacing between the first barrier rib 21 and the second barrier rib 31 is L, L ≥ 5 mm. L can be any value greater than or equal to 5 mm, such as 5 mm, 6 mm, 7 mm, 8 mm, etc., to avoid the spacing between the two being too small, resulting in an overly high temperature of the bottom shell 30.

[0041] like Figure 2 As shown, the overlapping length of the first retaining rib 21 and the second retaining rib 31 in the vertical direction is H1, H1 ≥ 10mm. Among them, H1 can be any value greater than or equal to 10mm, such as 10mm, 11mm, 12mm, 13mm, etc. It can be understood that the larger the overlapping length H1 of the first retaining rib 21 and the second retaining rib 31 in the vertical direction, the longer the heat dissipation path a for the heat generated by the heating component 10 to be transferred to the assembly area 40, the less heat is transferred to the assembly area 40, and the lower the temperature in the assembly area 40 is, so as to ensure that the temperature in the assembly area 40 meets the operating temperature of the electrical device.

[0042] like Figure 2 As shown, the height of the bottom surface of the heating component 10 is lower than the height of the top surface of the second barrier rib 31. That is, the height difference H2 obtained by subtracting the height of the bottom surface of the heating component 10 from the height of the top surface of the second barrier rib 31 satisfies H2≥0mm. As a result, the heat radiated downward by the heating component 10 cannot directly enter the gap between the first barrier rib 21 and the second barrier rib 31, but needs to turn at the end of the second barrier rib 31 away from the bottom shell 30 before entering the gap between the first barrier rib 21 and the second barrier rib 31, and needs to turn at the end of the first barrier rib 21 away from the support frame 20 before entering the assembly area 40, thereby extending the heat dissipation path a for the heat generated by the heating component 10 to be transferred to the assembly area 40, further reducing the temperature in the assembly area 40.

[0043] like Figure 1 , Figure 4 and Figure 5 As shown, in one embodiment, the bottom shell 30 includes a shell 32 and a bottom plate 33 connected to the shell 32. The bottom shell 30 is set as a split structure to facilitate production and processing. In addition, the shell 32 and the bottom plate 33 can be made of different materials. Since the heat of the heating component 10 will radiate downward, the temperature at the bottom plate 33 is usually high, so the bottom plate 33 needs to be made of a high-temperature resistant material. The cost of high-temperature resistant materials is usually high, and the temperature at the shell 32 is low, so the shell 32 can be made of a material with relatively weak heat resistance.

[0044] The bottom plate 33 can be made of one of PET, PBT or PA. PET, PBT and PA have good heat resistance to ensure that the bottom plate 33 will not be damaged in a high temperature environment for a long time. The shell 32 can be made of PP material. PP material has high strength and low cost, so as to ensure the overall strength of the bottom shell 30 and reduce production costs.

[0045] Of course, in other implementations, the bottom shell 30 may also be an integrated structure, as long as the overall strength and heat resistance of the bottom shell 30 can be guaranteed, and the embodiment of the utility model does not make any specific restrictions here.

[0046] like Figure 2 , Figure 4 and Figure 5 As shown, in one embodiment, when the bottom shell 30 is set as a split structure, the shell 32 is connected with the bottom plate 33 by snapping. The snapping structure is simple, which is convenient for assembling the shell 32 and the bottom plate 33, and is also convenient for disassembling and repairing other components inside the bottom shell 30. At the same time, it can also ensure the stability and reliability of the connection between the shell 32 and the bottom plate 33 in the assembled state, thereby ensuring the safety of use.

[0047] like Figure 1 , Figure 4 and Figure 5 As shown, specifically, the shell 32 includes a side wall portion 321 and a hollow bottom wall portion 322, and the bottom plate 33 is mounted on the bottom wall portion 322; one of the bottom plate 33 and the bottom wall portion 322 is provided with a buckle 34, and the other is provided with a block 35 that cooperates with the buckle 34. The outer edge of the support frame 20 is connected to the top of the side wall portion 321, and the assembly area 40 is surrounded by the first retaining rib 21, the top surface of the support frame 20 and the side wall portion 321. The bottom wall portion 322 of the shell 32 can reduce the size of the bottom plate 33, as long as the bottom plate 33 can cover the bottom surface of the heating component 10, thereby further reducing the production cost. In addition, the assembly of the bottom plate 33 and the shell 32 can be completed by only engaging the buckle 34 with the block 35, and the assembly process is simple and convenient, which is convenient for users to operate.

[0048] In the illustrated embodiment, the second retaining rib 31 is disposed on the bottom plate 33, the buckle 34 is disposed on the outer peripheral wall of the second retaining rib 31, and the clamping block 35 is disposed on the bottom wall portion 322. In this way, the heat generated by the heating component 10 needs to pass through the end of the second retaining rib 31 away from the bottom plate 33 before contacting the shell 32, thereby reducing the temperature at the shell 32 and preventing damage to the shell 32. Alternatively, the clamping block 35 may be disposed on the outer peripheral wall of the second retaining rib 31, and the buckle 34 may be disposed on the bottom wall portion 322.

[0049] In another embodiment, the second retaining rib 31 may be disposed at the innermost side of the bottom wall portion 322 , one of the buckle 34 and the block 35 may be disposed on the inner peripheral wall of the second retaining rib 31 , and the other may be disposed on the bottom plate 33 .

[0050] Among them, the number of clips 34 can be two, three, four or more, and multiple clips 34 are arranged at intervals along the outer periphery of the second baffle 31. The number of blocks 35 is also multiple and arranged one-to-one with the clips 34 to ensure the stability and reliability of the connection between the shell 32 and the base plate 33 in the assembled state.

[0051] Of course, in other embodiments, the shell 32 and the base plate 33 may also be connected by fasteners such as screws and bolts, as long as the stability and reliability of the connection between the shell 32 and the base plate 33 in the assembled state can be guaranteed, and the embodiments of the utility model are not specifically limited here.

[0052] like Figure 1 As shown, the heating assembly 10 includes a heating plate 11, a heating tube 13 and an electrical terminal 14. The heating tube 13 is fixed to the heating plate 11. The heating tube 13 includes a tube body section 131 and a lead section 132. The tube body section 131 is embedded in the heating plate 11, and the lead section 132 protrudes from the heating plate 11. The electrical terminal 14 is fixed to the lead section 132, and the maximum distance H3 between the electrical terminal 14 and the plate surface of the heating plate 11 in the vertical direction is less than or equal to 30 mm. The heating tube 13 is electrically connected to other components in the bottom shell 30 through the electrical terminal 14, and heats the pot placed on the heating plate 11 through the heating plate 11. Although reducing the maximum distance between the power terminal 14 and the surface of the heating plate 11 in the height direction can reduce the overall thickness of the heating assembly 10, so as to facilitate the user to store and pick up food, since the lead section 132 and the power terminal 14 are both protruding from the bottom of the heating plate 11, when the distance H3 between the power terminal 14 and the surface of the heating plate 11 is reduced, the height of the bottom space of the heating plate 11 will be reduced accordingly, and the heat dissipation rate will also be reduced accordingly. In the present application, the heat at the bottom of the heating plate 11 can be dissipated from the heat dissipation path a formed by the first retaining rib 21 and the second retaining rib 31, thereby improving the heat dissipation rate to a certain extent, and avoiding the cables or electrical components in the bottom shell 30 being in a high temperature environment for a long time due to the low heat dissipation rate.

[0053] like Figure 1 As shown, the heating assembly 10 further includes a reflector 12, which is disposed below the heating plate 11. The reflector 12 is used to reflect the heat radiated downward by the heating plate 11 toward the pot body to reduce heat loss and improve cooking effect.

[0054] like Figure 1As shown, a heat insulating sheet 50 is also provided between the reflector 12 and the bottom shell 30. The heat insulating sheet 50 can insulate the heating assembly 10 and the bottom shell 30, reduce the heat transferred downward from the heating assembly 10, reduce the heat loss, and lower the temperature of the bottom shell 30 and the assembly area 40. At the same time, the heat insulating sheet 50 can also prevent the wires passing through the bottom shell 30 from contacting and being damaged by the high-temperature reflector 12, thereby ensuring the safety of the cooking utensil. Among them, the heat insulating sheet 50 can be set at the bottom of the reflector 12 to form a double-layer heat insulation with the reflector 12 to enhance the heat insulating effect on the bottom shell 30. It is worth mentioning that the heat insulating sheet 50 can be a mica sheet.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A cooking utensil, comprising a base assembly and a pot body, wherein the pot body is placed on the base assembly, characterized in that: The base assembly comprises: A heating component (10); Electrical components; an annular support frame (20); and A bottom shell (30), the heating component (10) is mounted on the support frame (20), and the support frame (20) is arranged on the bottom shell (30), wherein a first retaining rib (21) is provided on a side of the support frame (20) facing the bottom shell (30); a second retaining rib (31) is provided on a side of the bottom wall of the bottom shell (30) facing the support frame (20), and the first retaining rib (21) and the second retaining rib (31) are partially overlapped in the vertical direction and are arranged at intervals in the horizontal direction; wherein the first retaining rib (21) is located outside the second retaining rib (31), and the electrical device is arranged in an area close to the support frame (20) and a side of the first retaining rib (21) away from the heating component; or The first barrier rib (21) is located inside the second barrier rib (31), and the electrical device is arranged in an area close to the bottom wall of the bottom shell (30) and on a side of the second barrier rib (31) away from the heating component.

2. The cooking device according to claim 1, characterized in that: The first retaining rib (21) and the second retaining rib (31) are spaced apart from each other in a horizontal direction by a distance L, where L is ≥ 5 mm.

3. The cooking device according to claim 1, characterized in that: The overlapping length of the first retaining rib (21) and the second retaining rib (31) in the vertical direction is H1, and H1 is ≥ 10 mm.

4. The cooking device according to claim 1, characterized in that: The height of the bottom surface of the heating component (10) is lower than the height of the top surface of the second retaining rib (31).

5. The cooking device according to claim 1, characterized in that: The bottom shell (30) comprises a shell body (32) and a bottom plate (33) connected to the shell body (32), and the shell body (32) and the bottom plate (33) are snap-connected.

6. The cooking device according to claim 5, characterized in that: The housing (32) comprises a side wall portion (321) and a hollow bottom wall portion (322), and the bottom plate (33) is mounted on the bottom wall portion (322); One of the bottom plate (33) and the bottom wall portion (322) is provided with a buckle (34), and the other is provided with a clamping block (35) that cooperates with the buckle (34).

7. The cooking device according to claim 6, characterized in that: The second retaining rib (31) is arranged on the bottom plate (33), the buckle (34) is arranged on the outer peripheral wall of the second retaining rib (31), and the clamping block (35) is arranged on the bottom wall portion (322).

8. The cooking device according to claim 5, characterized in that: The bottom plate (33) is made of a material selected from the group consisting of PET, PBT and PA; and / or The shell (32) is made of PP material.

9. The cooking device according to claim 1, characterized in that: The heating component (10) comprises: Heating plate (11); A heating pipe (13) is fixedly mounted on the heating plate (11), the heating pipe (13) comprising a pipe body section (131) and a lead section (132), the pipe body section (131) is embedded in the heating plate (11), and the lead section (132) protrudes from the heating plate (11); and The power connection terminal (14) is fixedly arranged on the lead-out section (132), and the maximum distance between the power connection terminal (14) and the plate surface of the heating plate (11) in the vertical direction is less than or equal to 30 mm.

10. The cooking appliance according to claim 9, characterized in that The heating component (10) further comprises a reflective cover (12), wherein the reflective cover (12) is arranged below the heating plate (11), and a heat insulating sheet (50) is arranged between the reflective cover (12) and the bottom shell (30).

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