CN209966107U

CN209966107U - Cooking utensil

Info

Publication number: CN209966107U
Application number: CN201920613044.XU
Authority: CN
Inventors: 曾俊兵; 陈鑫; 王本新
Original assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Current assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Priority date: 2019-04-29
Filing date: 2019-04-29
Publication date: 2020-01-21
Anticipated expiration: 2029-04-29

Abstract

The utility model provides a cooking utensil, including the pot body, the pot body includes: a housing; the heat preservation cover is arranged in the shell; the power board assembly is arranged in the shell and is arranged on the outer side of the heat-insulation cover at intervals, the power board assembly comprises a power box and a power board, and the power board is arranged on the power box and is positioned on one side of the power box, which is far away from the heat-insulation cover; the heat insulation structure is arranged between the power board assembly and the heat preservation cover. The technical scheme of the utility model cooking utensil among the prior art has been solved and has only relied on the power pack to prevent heat transfer to power strip, leads to the easy problem of being heated the damage of power strip.

Description

Cooking utensil

Technical Field

The utility model relates to the technical field of household appliances, particularly, relate to a cooking utensil.

Background

As a household appliance, the electric pressure cooker is more and more popular with consumers due to the characteristics of convenient use and fast cooking.

A power supply board and a power supply box are arranged in the electric pressure cooker, the power supply box is arranged below the heat insulation cover, and the power supply board is arranged below the power supply box. When the electric pressure cooker works, the heat preservation cover is heated, the power panel only depends on the power box for heat insulation, and as a plurality of precise components are arranged on the power panel and are sensitive to temperature, the heat preservation cover easily transfers heat to the power panel through the power box, so that the components on the power panel are damaged and lose efficacy, the normal use of the electric pressure cooker is influenced, and the service life of the electric pressure cooker is shortened.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a cooking utensil to cooking utensil among the solution prior art only relies on the power pack to prevent heat transfer to power strip, leads to the easy problem of being heated the damage of power strip.

In order to achieve the above object, the utility model provides a cooking utensil, including the pot body, the pot body includes: a housing; the heat preservation cover is arranged in the shell; the power board assembly is arranged in the shell and is arranged on the outer side of the heat-insulation cover at intervals, the power board assembly comprises a power box and a power board, and the power board is arranged on the power box and is positioned on one side of the power box, which is far away from the heat-insulation cover; the heat insulation structure is arranged between the power board assembly and the heat preservation cover.

Use the technical scheme of the utility model, still set up thermal-insulated structure between heat preservation cover and power pack, thermal-insulated structure and power pack play double-deck thermal-insulated technological effect for on preventing heat transfer to the power strip of heat preservation cover jointly, the cooking utensil that this application provided has good thermal-insulated effect.

Further, the heat insulation structure is connected with the power supply box and is arranged in a position adjustable mode in the interval direction of the heat preservation cover and the power supply board assembly.

Further, the power supply board assembly is located below the heat preservation cover, and the position of the heat insulation structure in the vertical direction is adjustable.

Furthermore, the heat insulation structure is a heat insulation plate, two ends of the heat insulation plate are bent to form clamping ends, a plurality of clamping groove groups which are arranged at intervals in the interval direction of the heat insulation cover and the power supply board assembly are formed on the outer wall surface of the power supply box, each clamping groove group comprises two clamping grooves which are in one-to-one correspondence fit with the two clamping ends, and the two clamping ends are selectively matched with one clamping groove group to realize position adjustment.

Further, the clamping groove extends along the horizontal direction to form a sliding connection groove; the heat insulation structure includes: a heat insulation plate; the two supporting arms are oppositely arranged at the two ends of the heat insulation plate; the two sliding blocks are arranged on the two supporting arms in a one-to-one correspondence manner to form clamping ends; the two sliding blocks are selectively in sliding connection with the two sliding connection grooves of one card groove group in the plurality of card groove groups.

Furthermore, all seted up positioning groove on the groove diapire in each sliding connection groove, be provided with on the slider with positioning groove looks adaptation location arch, after positioning groove was gone into to location arch card, the relative position locking of thermal-insulated structure and power pack.

Furthermore, the sliding connection groove comprises a straight opening groove section and a flaring groove section which are communicated, the flaring groove section is positioned at the second end of the sliding connection groove in the length direction, and the distance between two oppositely arranged groove side walls of the flaring groove section is gradually increased along the direction far away from the first end of the sliding connection groove in the length direction; and/or the sliding block comprises a first sliding block section and a second sliding block section which are connected, the first sliding block section is positioned at the first end of the sliding block in the length direction, and the size of the first sliding block section in the vertical direction is gradually reduced along the direction far away from the second end of the sliding block in the length direction.

Further, the distance S between the upper surface of the heat insulation structure and the lower surface of the heat preservation cover is larger than or equal to 5 mm.

Further, the heat insulating structure is made of an aluminum plated material.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic cross-sectional structural view of a cooking appliance according to an alternative embodiment of the present invention;

FIG. 2 shows an enlarged schematic view of the structure at A in FIG. 1;

FIG. 3 shows a disassembled schematic view of the cooking appliance of FIG. 1;

fig. 4 shows a schematic structural view of a power pack of the cooking appliance of fig. 1;

FIG. 5 illustrates an angular structural view of the insulating structure of the cooking appliance of FIG. 1;

FIG. 6 shows a schematic view of another angle of the insulation structure of FIG. 5.

Wherein the figures include the following reference numerals:

100. a pan body; 10. a housing; 11. a base; 12. a side casing; 20. a heat-preserving cover; 30. a power board assembly; 31. a power supply box; 311. a sliding connection groove; 312. a positioning groove; 313. a straight slot section; 314. a flaring groove section; 32. a power panel; 40. a thermally insulating structure; 41. a heat insulation plate; 42. a support arm; 43. a slider; 44. positioning the projection; 431. a first slider segment; 432. a second slider segment; 50. an inner pot; 60. a heat source structure; 200. and (4) a pot cover.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In order to solve the cooking utensil among the prior art and only rely on the power pack to prevent heat transfer to power strip, lead to the problem of power strip damage by being heated easily, the utility model provides a cooking utensil. It should be noted that the cooking appliance of the present application includes an electric pressure cooker or an electric rice cooker, but is not limited to both, and the illustrated embodiment of the present application takes an electric pressure cooker as an example.

As shown in fig. 1 to 6, the cooking utensil includes a pot body 100, the pot body 100 includes a housing 10, a heat insulation cover 20, a power board assembly 30 and a heat insulation structure 40, the heat insulation cover 20 is disposed in the housing 10, the power board assembly 30 is disposed in the housing 10 and disposed at an outer side of the heat insulation cover 20 at intervals, the power board assembly 30 includes a power box 31 and a power board 32, the power board 32 is mounted on the power box 31 and located on a side of the power box 31 departing from the heat insulation cover 20, and the heat insulation structure 40 is disposed between the power board assembly 30 and the heat insulation cover 20.

In the embodiment of the application, the heat insulation structure 40 is further arranged between the heat insulation cover 20 and the power supply box 31, the heat insulation structure 40 and the power supply box 31 achieve a double-layer heat insulation technical effect, the heat of the heat insulation cover 20 is prevented from being transferred to the power supply board 32, and the cooking appliance provided by the application has a good heat insulation effect.

As shown in fig. 2 to 5, the heat insulating structure 40 is connected to the power supply box 31 and is position-adjustably provided in the spaced direction of the heat insulating cover 20 and the power supply board assembly 30. The heat insulation structure 40 can adjust the relative position between the heat insulation cover 20 and the outer case 10 in the vertical direction in consideration of the difference of the distance between the heat insulation cover and the outer case 10 of different models of cooking appliances, thereby adapting to the space limitation of different models of cooking appliances. Thus, the present application provides for versatility in the power strip assembly 30 and the thermal isolation structure 40.

As shown in fig. 1 and 2, the cooking appliance further includes an inner pan 50 and a heat source structure 60, the heat source structure 60 being disposed below the inner pan 50 and between the inner pan 50 and the heat-retaining cover 20; the heat generated by the heat source structure 60 is used for heating the inner pot 50, the heat-insulating cover 20 is used for reducing heat loss, and the heat generated by the heat source structure 60 is transferred to the heat-insulating cover 20. In an alternative embodiment shown in fig. 1 and 2, the power strip assembly 30 is located below the insulated housing 20, and the position of the insulating structure 40 in the vertical direction is adjustable. In this way, the heat insulating structure 40 serves to prevent heat of the heat retaining cover 20 from being transferred to the power supply board 32.

In an alternative embodiment of the present application, which is not shown in the drawings, the power board assembly 30 may be installed between the side wall of the heat-insulating cover 20 and the housing 10, and the heat-insulating structure 40, the power box 31 and the power board 32 are sequentially disposed in a direction away from the heat-insulating cover 20.

Optionally, the heat insulation structure 40 is a heat insulation plate, two ends of the heat insulation plate are bent to form clamping ends, a plurality of clamping groove sets are formed on the outer wall surface of the power supply box 31 and are arranged at intervals in the interval direction of the heat insulation cover 20 and the power supply board assembly 30, each clamping groove set comprises two clamping grooves which are in one-to-one correspondence with the two clamping ends, and the two clamping ends are selectively matched with one clamping groove set to realize position adjustment. The clamping end is clamped into the clamping groove after elastic deformation, and the heat insulation structure 40 is fixedly arranged on the power supply box 31; the clamping end is separated from the clamping groove under the action of external force, and the relative position between the heat insulation structure 40 and the power supply box 31 is changed. Thermal-insulated structure 40 and power pack 31 joint are favorable to promoting cooking utensil's assembly efficiency.

As shown in fig. 2 to 6, the card slot extends in the horizontal direction to form a slip-on slot 311; the heat insulation structure 40 comprises a heat insulation plate 41, two supporting arms 42 and two sliding blocks 43, wherein the two supporting arms 42 are oppositely arranged at two ends of the heat insulation plate 41, and the two sliding blocks 43 are correspondingly arranged on the two supporting arms 42 one by one to form clamping ends; the two sliding blocks 43 are selectively slidably connected with the two sliding grooves 311 of one card slot group in the multiple card slot groups. Thus, the heat insulation structure 40 is slidably connected with the sliding groove 311 through the slider 43, and the heat insulation structure 40 is slidably connected with the power supply box 31, so that the assembly efficiency of the cooking appliance is improved.

In the alternative embodiment of fig. 1 to 6 of the present application, there are two sliding contact slots 311.

As shown in fig. 4, the bottom wall of each sliding groove 311 is provided with a positioning groove 312, as shown in fig. 5 and 6, the slider 43 is provided with a positioning protrusion 44 adapted to the positioning groove 312, and after the positioning protrusion 44 is snapped into the positioning groove 312, the relative position of the heat insulation structure 40 and the power supply box 31 is locked. The sliding block 43 extends into the sliding connection groove 311 from one end of the power supply box 31 and then slides to the other end of the power supply box 31 until the positioning protrusion 44 is clamped into the positioning groove 312, and the heat insulation structure 40 is fixedly connected with the power supply box 31; the positioning protrusion 44 is pulled out from the positioning groove 312 by an external force, so as to change the relative position between the heat insulation structure 40 and the power supply box 31.

Alternatively, the sliding contact slot 311 extends in the width direction of the power supply box 31, and penetrates both end surfaces in the width direction of the power supply box 31.

As shown in fig. 4, the sliding connection slot 311 includes a straight slot section 313 and a flared slot section 314 that are communicated with each other, the flared slot section 314 is located at a second end of the sliding connection slot 311 in the length direction, and a distance between two oppositely disposed slot sidewalls of the flared slot section 314 gradually increases in a direction away from the first end of the sliding connection slot 311 in the length direction. Therefore, the sliding block 43 can be rapidly extended into the sliding connection groove 311 through the flaring groove section 314 in a labor-saving manner, and the assembly efficiency of the cooking utensil is improved.

As shown in fig. 6, the slider 43 includes a first slider section 431 and a second slider section 432 connected to each other, the first slider section 431 is located at a first end of the slider 43 in the length direction, and the size of the first slider section 431 in the vertical direction is gradually reduced in a direction away from a second end of the slider 43 in the length direction. Therefore, the sliding block 43 can be rapidly extended into the sliding connection groove 311 through the first sliding block section 431 in a labor-saving manner, and the assembly efficiency of the cooking utensil is improved.

In an alternative embodiment of the present application, not shown in the drawings, two opposite side walls of the power supply box 31 are respectively provided with a guide block extending along the horizontal direction, two corresponding guide blocks form a set of guide assemblies, and a plurality of sets of guide assemblies are arranged on the power supply box 31 at intervals along the vertical direction; the heat insulation structure 40 comprises a heat insulation plate 41 and two support arms 42, wherein the two support arms 42 are arranged on the lower surface of the heat insulation plate 41 at intervals along the horizontal direction; the surfaces of the two supporting arms 42 which are oppositely arranged are respectively provided with a sliding connection groove 311; the two sliding grooves 311 are selectively slidably connected with one of the guiding members to adjust the distance between the lower surface of the heat-insulating board 41 and the upper surface of the power supply box 31.

In an optional embodiment, not shown in the drawings, the power supply box 31 is provided with a plurality of first connection holes arranged at intervals in the vertical direction, the heat insulation structure 40 is provided with a second connection hole, and the second connection hole is selectively arranged opposite to one of the plurality of first connection holes, so that the adjustment of the relative position between the heat insulation structure 40 and the power supply box 31 in the vertical direction is realized; the pot body further comprises a locking piece, and the power supply box 31 is fixedly connected with the heat insulation structure 40 after the locking piece penetrates through the second connecting hole and the first connecting hole which are oppositely arranged.

It should be noted that the present application is not limited to the illustrated alternative embodiments as long as the relative position between the heat insulating structure 40 and the power supply box 31 can be adjusted.

As shown in fig. 1, the distance S between the upper surface of the heat insulating structure 40 and the lower surface of the heat retaining cover 20 is 5mm or more. Thus, it is possible to effectively prevent the heat insulating structure 40 from being too close to the heat insulating cover 20 to exhibit a good heat insulating effect. By limiting the distance between the upper surface of the heat insulation structure 40 and the lower surface of the heat preservation cover 20, the distance between the heat preservation cover 20 and the power supply board 32 is ensured, and therefore the heat insulation effect of the heat insulation structure 40 is ensured.

Optionally, the insulating structure 40 is made of an aluminum plated material. The heat insulation structure 40 made of the aluminum-plated material has a good heat insulation effect and economical efficiency.

Alternatively, the insulation structure 40 is made of an aluminum-plated steel sheet having good heat resistance, heat reflectivity, and corrosion resistance, and mechanical and physical properties significantly superior to those of a cold-rolled steel sheet.

As shown in fig. 1 and 3, the cooking appliance further includes a lid 200 covering the pot body 100, a mounting opening is formed below the power supply box 31, and the power supply board 32 is mounted in the power supply box 31 through the mounting opening. Thus, the power supply board 32 is mounted in the power supply box 31 through the mounting opening, the housing 10 includes a base 11 and a side case 12 provided on the base 11, the power supply box 31 is provided on the base 11, and the heat insulating structure 40 is mounted on a side of the power supply box 31 away from the base 11.

In an alternative embodiment of the present application, not shown, the thermal insulation structure 40 is connected to the housing 10 and is located between the insulated enclosure 20 and the power strip assembly 30. The heat insulation structure 40 and the power supply box 31 have a double-layer heat insulation technical effect, and are used for jointly preventing heat of the heat insulation cover 20 from being transferred to the power supply board 32.

The application provides a cooking utensil is through setting up thermal-insulated structure 40 on power pack 31, can reduce the temperature rise of power strip 32 effectively, avoids the temperature rise of the components and parts on the power strip 32 to surpass the limit value effectively to avoid the components and parts on the power strip 32 to damage, be favorable to promoting cooking utensil's life. Meanwhile, the position between the heat insulation structure 40 and the power supply box 31 can be adjusted, that is, the distance between the heat insulation board 41 and the power supply box 31 can be properly adjusted, so that the space limitation of different machines can be adapted.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and 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 interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cooking appliance, characterized in that it comprises a pan body (100), said pan body (100) comprising:

a housing (10);

the heat-preservation cover (20), the heat-preservation cover (20) is arranged in the shell (10);

the power board assembly (30) is arranged in the shell (10) and is arranged on the outer side of the heat preservation cover (20) at intervals, the power board assembly (30) comprises a power box (31) and a power board (32), and the power board (32) is installed on the power box (31) and is positioned on one side, away from the heat preservation cover (20), of the power box (31);

a thermal insulation structure (40), the thermal insulation structure (40) being disposed between the power board assembly (30) and the heat retaining cover (20).

2. The cooking appliance according to claim 1, wherein the heat insulating structure (40) is connected to the power pack (31) and is position-adjustably provided in a spaced direction of the heat retaining cover (20) and the power board assembly (30).

3. The cooking appliance according to claim 2, wherein the power board assembly (30) is located below the heat retaining cover (20), and the position of the heat insulating structure (40) in the vertical direction is adjustable.

4. The cooking utensil of claim 2, wherein the heat insulation structure (40) is a heat insulation plate, two ends of the heat insulation plate are bent to form clamping ends, a plurality of clamping groove sets are formed on the outer wall surface of the power supply box (31) and are arranged at intervals in the interval direction of the heat insulation cover (20) and the power supply board assembly (30), each clamping groove set comprises two clamping grooves which are correspondingly matched with the two clamping ends one by one, and the two clamping ends are selectively matched with one clamping groove set to realize position adjustment.

5. The cooking appliance according to claim 4, wherein the catch groove extends in a horizontal direction to form a slip-on groove (311); the heat insulation structure (40) includes:

a heat insulating plate (41);

two supporting arms (42), wherein the two supporting arms (42) are oppositely arranged at two ends of the heat insulation plate (41);

the two sliding blocks (43) are arranged on the two supporting arms (42) in a one-to-one correspondence mode to form the clamping end; the two sliding blocks (43) are selectively and slidably connected with the two sliding connection grooves (311) of one clamping groove group in the plurality of clamping groove groups.

6. The cooking appliance according to claim 5, wherein a positioning groove (312) is formed in the bottom wall of each sliding connection groove (311), a positioning protrusion (44) matched with the positioning groove (312) is arranged on the sliding block (43), and after the positioning protrusion (44) is clamped into the positioning groove (312), the relative position of the heat insulation structure (40) and the power supply box (31) is locked.

7. The cooking appliance of claim 5,

the sliding connection groove (311) comprises a straight opening groove section (313) and a flaring groove section (314) which are communicated with each other, the flaring groove section (314) is positioned at the second end of the sliding connection groove (311) in the length direction, and the distance between two oppositely arranged groove side walls of the flaring groove section (314) is gradually increased along the direction far away from the first end of the sliding connection groove (311) in the length direction; and/or

The sliding block (43) comprises a first sliding block section (431) and a second sliding block section (432) which are connected, the first sliding block section (431) is located at a first end of the sliding block (43) in the length direction, and the size of the first sliding block section (431) in the vertical direction is gradually reduced along the direction far away from a second end of the sliding block (43) in the length direction.

8. The cooking appliance according to any one of claims 1 to 7, wherein the distance S between the upper surface of the heat-insulating structure (40) and the lower surface of the heat-retaining cover (20) is greater than or equal to 5 mm.

9. The cooking appliance according to any one of claims 1 to 7, wherein the heat insulating structure (40) is made of an aluminized material.

10. The cooking appliance according to claim 1, wherein the heat insulating structure (40) is connected to the power supply box (31) and is position-adjustably provided in a spaced direction of the heat retaining cover (20) and the power supply board assembly (30); the power board assembly (30) is positioned below the heat preservation cover (20), and the position of the heat insulation structure (40) in the vertical direction is adjustable; the heat insulation structure (40) is a heat insulation plate, two ends of the heat insulation plate are bent to form clamping ends, a plurality of clamping groove groups which are arranged at intervals in the interval direction of the heat insulation cover (20) and the power supply board assembly (30) are formed on the outer wall surface of the power supply box (31), each clamping groove group comprises two clamping grooves which are correspondingly matched with the two clamping ends one by one, and the two clamping ends are selectively matched with one clamping groove group to realize position adjustment; the clamping groove extends along the horizontal direction to form a sliding connection groove (311); the heat insulation structure (40) comprises a heat insulation plate (41), two supporting arms (42) and two sliding blocks (43), the two supporting arms (42) are oppositely arranged at two ends of the heat insulation plate (41), and the two sliding blocks (43) are correspondingly arranged on the two supporting arms (42) one by one to form the clamping ends; the two sliding blocks (43) are selectively and slidably connected with the two sliding connection grooves (311) of one clamping groove group in the plurality of clamping groove groups; positioning grooves (312) are formed in the bottom wall of each sliding connection groove (311), positioning protrusions (44) matched with the positioning grooves (312) are arranged on the sliding block (43), and when the positioning protrusions (44) are clamped into the positioning grooves (312), the relative positions of the heat insulation structure (40) and the power supply box (31) are locked; the sliding connection groove (311) comprises a straight opening groove section (313) and a flaring groove section (314) which are communicated with each other, the flaring groove section (314) is positioned at the second end of the sliding connection groove (311) in the length direction, and the distance between two oppositely arranged groove side walls of the flaring groove section (314) is gradually increased along the direction far away from the first end of the sliding connection groove (311) in the length direction; the sliding block (43) comprises a first sliding block section (431) and a second sliding block section (432) which are connected, the first sliding block section (431) is located at a first end of the sliding block (43) in the length direction, and the size of the first sliding block section (431) in the vertical direction is gradually reduced along the direction far away from a second end of the sliding block (43) in the length direction; the distance S between the upper surface of the heat insulation structure (40) and the lower surface of the heat preservation cover (20) is more than or equal to 5 mm; the heat insulating structure (40) is made of an aluminum-plated material.