Heating disc assembly sealing connection device for electric kettle

Abstract

The invention relates to the technical field of electric kettles, in particular to a heating disc assembly sealing and connecting device for an electric kettle, which comprises a kettle body, an upper shell and a lower shell, the upper shell and the lower shell are arranged below the kettle body, and an elastic sealing gasket for sealing the joint of the upper shell and the lower shell is arranged at the bottom of an upper threaded joint. An expansion sealing strip is further placed on the side, away from the groove, of the metal sheet. An expansion sealing strip is expanded through heating, so that an elastic sealing gasket is driven to expand, the sealing performance of connection between shells is improved, water is prevented from overflowing and dripping into the shells in the heating process, a liquid level sensor is arranged in a kettle body to be matched with an elastic piece, a coupler body of the kettle body moves in a coupler shell, and therefore the sealing performance of connection between the shells is improved. And when the water level is low, the coupler body moves upwards, so that the coupler body cannot be connected with a base power supply to be electrified for heating, and potential safety hazards in the using process can be further reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electric kettles, and in particular to a sealing connection device for a heating plate assembly of an electric kettle. Background Art

[0002] The heating plate assembly of an electric kettle refers to an overall system including a heating element (such as an electric heating tube or electric heating wire), a heating plate (for conducting heat to water), a thermostat (for regulating heating), etc., and a safety protection device. These components work together to convert electrical energy into thermal energy to heat water safely and efficiently. In order to facilitate the installation of the corresponding components in the heating plate and subsequent maintenance, the upper and lower detachable shells are generally used to seal it;

[0003] In the process of heating the kettle body, the water in the kettle boils and may overflow, so that water droplets may flow along the outer wall of the kettle to the connection of the shell. Although the existing heating plate assembly is sealed by the upper and lower shells, it is inevitable that the upper and lower shells will be worn during long-term use. Therefore, the sealing of the connection may be reduced, so that the overflowed water may enter the shell, thereby causing short-circuit damage to the relevant circuit components and related heating components inside the shell, and even leakage or electric shock may occur in severe cases, which is harmful to the user. The safety of the user is threatened. In the process of use, when the water level in the kettle is low, the heating plate of the kettle may still be powered on for heating due to improper operation by the user. In particular, stainless steel kettles may be damaged or deformed in the high-temperature area of ​​the inner wall. Stainless steel may deform or discolor under high temperature. Long-term high-temperature heating may also affect the protective layer on its surface. When the water level is too low, the heating components of the kettle may overheat due to lack of water to dissipate heat, resulting in dry boiling of the kettle, which may seriously damage the heating elements (such as the heating wire or the heating plate) or even cause a fire hazard.

[0004] In view of this, we propose a sealing connection device for a heating plate assembly of an electric kettle. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a sealing connection device for a heating plate assembly of an electric kettle, which can effectively solve the problems in the prior art of insufficient sealing between the shells, and continuous heating when the water level is low, which may easily cause damage to the heating element and the kettle itself, and there are also corresponding safety hazards.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The present invention provides a sealing connection device for a heating plate assembly of an electric kettle, comprising a kettle body and an upper shell and a lower shell arranged below the kettle body, a heat conducting plate fixedly mounted on the top of the upper shell, and the heat conducting plate fixedly mounted on the bottom of the kettle body;

[0008] An upper threaded joint for fixing the lower shell is fixedly installed at the bottom of the upper shell, and an elastic sealing gasket for sealing the connection between the upper shell and the lower shell is provided at the bottom of the upper threaded joint. A groove is provided inside the elastic sealing gasket, and a metal sheet is fixedly installed on the inner cavity side wall of the groove, and an expansion sealing strip is also placed on the side of the metal sheet away from the groove;

[0009] A heating element is provided inside the upper shell and the lower shell. When the heating element is heated, the expansion sealing strip expands, thereby causing the metal sheet and the elastic sealing gasket to deform and expand, further sealing the connection between the upper shell and the lower shell.

[0010] A coupler housing is fixedly installed on the top of the inner cavity of the upper shell, a coupler body is fixedly installed inside the coupler housing, and a liquid level sensor for detecting the water level in the kettle body is arranged on the inner cavity side wall of the kettle body, and elastic members are arranged inside the coupler housing and on the surface of the coupler body;

[0011] When the liquid level sensor detects that the water level in the kettle body reaches the corresponding position, its elastic part can move the coupler body downward from the coupler shell, so that the coupler body can be plugged into the base power supply for use; conversely, when the water in the kettle body is lower than the corresponding position, the coupler body does not move, and after moving, when the water level is lower than the corresponding position, the coupler body moves upward and resets.

[0012] Furthermore, a semiconductor cooling sheet is fixedly mounted on the surface of the coupler housing, and the inner side of the semiconductor cooling sheet is a cold end surface, and the outer side is a hot end surface;

[0013] The heating element includes an electric heating tube fixedly mounted on the top of the inner cavity of the upper shell, and a plurality of groups of heat conducting tubes are fixedly mounted on the surface of the electric heating tube, and the ends of the plurality of heat conducting tubes away from the electric heating tube are fixedly mounted on the hot end surface of the semiconductor refrigeration plate;

[0014] When the electric heating tube generates heat, the heat is transferred to the hot end surface of the semiconductor refrigeration plate through multiple groups of heat-conducting tubes, thereby reducing the temperature of the cold end surface of the semiconductor refrigeration plate, thereby cooling the coupler body in the coupler housing.

[0015] Furthermore, a plurality of positioning columns are fixedly installed at the bottom of the upper threaded joint, a corresponding number of positioning holes are opened at the top of the elastic sealing gasket, and the plurality of positioning columns are snap-fitted into the inside of the positioning holes, thereby fixing the elastic sealing gasket.

[0016] Furthermore, a plurality of positioning columns are fixedly installed at the bottom of the upper threaded joint, a corresponding number of positioning holes are opened at the top of the elastic sealing gasket, and the plurality of positioning columns are snap-fitted into the inside of the positioning holes, thereby fixing the elastic sealing gasket.

[0017] Furthermore, a thread groove is provided at the bottom of the coupler housing, a thread ring corresponding to the thread groove is fixedly installed at the top of the lower housing, and the surface of the thread ring is threadedly connected to the inner cavity side wall of the thread groove;

[0018] Therefore, when the upper shell and the lower shell are connected and fixed, the lower shell and the coupler housing can also be kept relatively sealed.

[0019] Furthermore, the elastic member includes two sets of guide grooves provided on the inner cavity side wall of the coupler housing, the inner cavity side walls of the two sets of guide grooves are slidably connected with slide bars, and the two sets of slide bars are fixedly mounted on the surface of the coupler body at the sides close to each other;

[0020] At the same time, a plurality of sets of elastic telescopic rods are fixedly installed on the top of the coupler body to reset the coupler body, an upper electromagnetic sheet is fixedly installed on the surface of the coupler body, and a lower electromagnetic sheet corresponding to the upper electromagnetic sheet is also fixedly installed on the inner cavity side wall of the coupler body.

[0021] Furthermore, the expansion seal strip is made of high temperature resistant composite materials, including silicone, high temperature resistant rubber, fluororubber, etc., which not only has good high temperature resistance, but also can expand during heating. Then, the expansion of the expansion seal strip can make the metal sheet fit more closely to the inner wall of the elastic sealing gasket, so that the elastic sealing gasket can be further sealed when it is worn.

[0022] Beneficial Effects

[0023] Compared with the known public technology, the technical solution provided by the present invention has the following beneficial effects:

[0024] The present invention utilizes the high temperature of the electric heating tube to heat the water in the kettle body, so that the expansion sealing strip expands, thereby driving the elastic sealing gasket to expand, thereby improving the sealing of the connection between the shells, avoiding water overflowing and dripping into the inside of the shell during the heating process, causing damage to the internal components and posing a safety threat, and utilizing a liquid level sensor in the kettle body, so that the water level cooperates with the elastic member to make the coupler body move in the coupler shell. When the water level is low, the coupler body moves upward, so that it is impossible to connect the coupler body to the base power supply and power on for heating, thereby further reducing the safety hazard during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a schematic diagram of the structure of the present invention from a first viewing angle;

[0027] Figure 2 It is a schematic diagram of disassembling the upper shell and the lower shell and related components of the present invention;

[0028] Figure 3 It is a schematic diagram of the internal component structure of the upper shell of the present invention;

[0029] Figure 4 It is a schematic diagram of the partial structure of the elastic sealing gasket and the upper threaded joint of the present invention when being disassembled;

[0030] Figure 5 It is a schematic diagram of the partial disassembly structure of the coupler and the semiconductor cooling plate of the present invention;

[0031] Figure 6 It is a schematic diagram of the partial structure of the lower housing and related components of the present invention;

[0032] Figure 7 It is a schematic diagram of a partial structure of a cross-sectional view of a coupler housing of the present invention;

[0033] Figure 8 It is a schematic diagram of the partial structure of the upper electromagnetic sheet, the lower electromagnetic sheet and related components of the present invention.

[0034] Figure numerals: 1. kettle body; 2. upper shell; 3. lower shell; 4. coupler shell; 5. coupler body; 6. heat conducting plate; 7. upper threaded joint; 8. elastic sealing gasket; 9. internal thread ring; 10. electric heating tube; 11. heat conducting tube; 12. semiconductor refrigeration plate; 13. positioning column; 14. positioning hole; 15. groove; 16. expansion sealing strip; 17. metal sheet; 18. threaded groove; 19. threaded ring; 20. hot end face; 21. cold end face; 22. extrusion plate; 23. guide groove; 24. slide bar; 25. elastic telescopic rod; 26. upper electromagnetic sheet; 26. lower electromagnetic sheet. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The present invention will be further described below in conjunction with the embodiments.

[0037] Example:

[0038] A sealing connection device for a heating plate assembly of an electric kettle, comprising a kettle body 1 and an upper shell 2 and a lower shell 3 arranged below the kettle body 1, a heat conducting plate 6 being fixedly mounted on the top of the upper shell 2, the heat conducting plate 6 being fixedly mounted on the bottom of the kettle body 1, an upper threaded joint 7 for fixing the lower shell 3 being fixedly mounted on the bottom of the upper shell 2, an elastic sealing gasket 8 for sealing the connection between the upper shell 2 and the lower shell 3 being provided at the bottom of the upper threaded joint 7, a groove 15 being provided inside the elastic sealing gasket 8, a metal sheet 17 being fixedly mounted on the inner cavity side wall of the groove 15, and an expansion sealing strip 16 being further placed on the side of the metal sheet 17 away from the groove 15, a heating element being provided inside the upper shell 2 and the lower shell 3, and when the heating element is heated, the expansion sealing strip 16 expands, thereby deforming and expanding the metal sheet 17 and the elastic sealing gasket 8, and further sealing the connection between the upper shell 2 and the lower shell 3;

[0039] Specifically, the expansion seal strip 16 is made of a high temperature resistant composite material, including silicone, high temperature resistant rubber, fluororubber, etc., which not only has good high temperature resistance, but also expands during heating. The expansion of the expansion seal strip 16 can make the metal sheet 17 fit more closely to the inner wall of the elastic sealing gasket 8, so that the elastic sealing gasket 8 can be further sealed when it is worn.

[0040] Specifically, in order to ensure its overall sealing performance, the kettle body 1, the heat-conducting plate 6 at the bottom and the upper shell 2 are integrally formed, so as to prevent water from penetrating from the kettle body 1. The heating element is used to heat the heat-conducting plate 6, and then the water in the kettle body 1 can be heated to boil water. At the same time, during the heating process of the heating element, an internal expansion sealing strip 16 with the elastic sealing gasket 8 is provided. When the expansion sealing strip 16 expands, the elastic sealing gasket 8 can also be driven to expand at the same time, so that the connection between the upper shell 2 and the lower shell 3 can be further sealed, and water overflow can be prevented during the boiling process, so that water droplets flow along the surface of the kettle body 1 into the upper shell 2 and the lower shell 3. The expansion sealing strip 16, the metal sheet 17 and the elastic sealing gasket 8 are used to improve the sealing of the connection, and they are also convenient and quick to install and disassemble, so that they can be replaced according to their different degrees of wear and damage during later use.

[0041] Specifically, a semiconductor cooling sheet 12 is fixedly mounted on the surface of the coupler housing 4, and the inner side of the semiconductor cooling sheet 12 is a cold end surface 21, and the outer side is a hot end surface 20. The heating element includes an electric heating tube 10 fixedly mounted on the top of the inner cavity of the upper shell 2, and a plurality of groups of heat conducting tubes 11 are fixedly mounted on the surface of the electric heating tube 10. One end of the plurality of groups of heat conducting tubes 11 away from the electric heating tube 10 is fixedly mounted on the hot end surface 20 of the semiconductor cooling sheet 12. When the electric heating tube 10 generates heat, the heat is transferred to the hot end surface 20 of the semiconductor cooling sheet 12 through the plurality of groups of heat conducting tubes 11, thereby reducing the temperature of the cold end surface 21 of the semiconductor cooling sheet 12, thereby cooling the coupler body 5 in the coupler housing 4.

[0042] Specifically, the coupler body 5 can be connected to an external base power supply to be energized, so that the electric heating tube 10 is heated, thereby achieving water boiling and expanding the expansion sealing strip 16. At the same time, when the electric heating tube 10 is heated, the heat can be transferred to the hot end surface 20 of the semiconductor 12 through the multiple groups of heat conducting tubes 11, and the temperature of the cold end surface 21 of the semiconductor cooling sheet 12 is reduced. Since the cold end surface 21 is in contact with the coupler housing 4, the coupler body 5 can be cooled, thereby avoiding the temperature of the coupler body 5 being too high during the heating process of the electric heating tube 10, thereby causing damage to the internal circuit components;

[0043] Furthermore, a coupler housing 4 is fixedly mounted on the top of the inner cavity of the upper shell 2, a coupler body 5 is fixedly mounted inside the coupler housing 4, and a liquid level sensor for detecting the water level in the kettle body 1 is provided on the inner cavity side wall of the kettle body 1. At the same time, elastic parts are provided inside the coupler housing 4 and on the surface of the coupler body 5. When the liquid level sensor detects that the water level in the kettle body 1 reaches a corresponding position, the elastic part can move the coupler body 5 downward from the coupler housing 4, so that the coupler body 5 can be plugged and used with the base power supply. On the contrary, when the water in the kettle body 1 is lower than the corresponding position, the coupler body 5 does not move, and after moving, when the water level is lower than the corresponding position, the coupler body 5 moves upward to reset;

[0044] Specifically, the elastic member includes two groups of guide grooves 23 provided on the inner cavity side wall of the coupler housing 4, the inner cavity side walls of the two groups of guide grooves 23 are slidably connected with slide bars 24, and the two groups of slide bars 24 are fixedly installed on the surface of the coupler body 5 on the side close to each other. At the same time, the top of the coupler body 5 is fixedly installed with multiple groups of elastic telescopic rods 25 that can reset the coupler body 5, and the surface of the coupler body 5 is fixedly installed with an upper electromagnetic sheet 26, and the inner cavity side wall of the coupler body 4 is also fixedly installed with a lower electromagnetic sheet 27 corresponding to the upper electromagnetic sheet 26;

[0045] Specifically, the liquid level sensor provided in the kettle body 1 can be used to detect the water level inside the kettle. When the water level reaches the relative height, the upper electromagnetic sheet 26 and the lower electromagnetic sheet 27 are energized, and the specific water level setting can be selected according to the performance and capacity of different corresponding kettles. When the upper electromagnetic sheet 26 and the lower electromagnetic sheet 27 are energized, an adsorption force can be generated, so that the multiple sets of elastic telescopic rods 25 are extended, and the guide groove 23 and the slide bar 24 can be used to stably slide the coupler body 5, so that it can be connected to the external power base for power supply and use. On the contrary, when the water level is too low, the coupler body 5 will not slide out, so when the water level is low, it cannot be powered on and used. At the same time, after the water is boiled, the internal hot water is poured out, the water level is lowered, and the upper electromagnetic sheet 26 and the lower electromagnetic sheet 27 are powered off, so that the multiple sets of elastic telescopic rods 25 are contracted to reset the coupler body 5.

[0046] Furthermore, a plurality of groups of positioning posts 13 are fixedly installed at the bottom of the upper threaded joint 7, and a number of positioning holes 14 corresponding to the number of positioning posts 13 are opened at the top of the elastic sealing gasket 8, and the plurality of groups of positioning posts 13 are all snapped into the inside of the positioning holes 14, so that the elastic sealing gasket 8 can be fixed, and an inner thread ring 9 is opened on the inner cavity side wall of the lower shell 3, and the inner cavity side wall of the inner thread ring 9 is threadedly connected to the upper threaded joint 7, and an extrusion plate 22 is also fixedly installed on the inner cavity side wall of the lower shell 3. When the upper shell 2 and the lower shell 3 are fixed by the inner thread ring 9 and the upper threaded joint 7, the elastic sealing gasket 8 can be squeezed by the extrusion plate 22, and a thread groove 18 is opened at the bottom of the coupler shell 4, and a thread ring 19 corresponding to the thread groove 18 is fixedly installed on the top of the lower shell 3, and the surface of the thread ring 19 is threadedly connected to the inner cavity side wall of the thread groove 18, so that when the upper shell 2 and the lower shell 3 are connected and fixed, the lower shell 3 and the coupler shell 4 can also maintain relative sealing;

[0047] Specifically, the upper threaded joint 7 and the internal threaded ring 9 facilitate the quick installation and fixation of the upper shell 2 and the lower shell 3. At the same time, it is also convenient to disassemble when the internal components are replaced or repaired at a later time. The extrusion plate 22 provided in the lower shell 3 can also pressurize the elastic sealing gasket 8 when it is installed and fixed, so as to further improve its sealing performance. At the same time, the threaded groove 18 and the threaded ring 19 can be used to keep the coupler housing 4 relatively fixed to the lower shell 3, and the sealing between them can also be improved. The multiple groups of positioning columns 13 and positioning holes 14 are provided to facilitate the positioning and installation of the elastic sealing gasket 8, so that it can be kept in a relatively fixed position, avoiding the occurrence of displacement during the installation process, which affects its sealing effect.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sealing connection device for a heating plate assembly of an electric kettle, characterized in that: include: A kettle body (1) and an upper shell (2) and a lower shell (3) arranged below the kettle body (1); a heat conducting plate (6) is fixedly mounted on the top of the upper shell (2); and the heat conducting plate (6) is fixedly mounted on the bottom of the kettle body (1); An upper threaded joint (7) for fixing the lower shell (3) is fixedly mounted at the bottom of the upper shell (2); an elastic sealing gasket (8) for sealing the connection between the upper shell (2) and the lower shell (3) is provided at the bottom of the upper threaded joint (7); a groove (15) is provided inside the elastic sealing gasket (8); a metal sheet (17) is fixedly mounted on the inner cavity side wall of the groove (15); and an expansion sealing strip (16) is also placed on the side of the metal sheet (17) away from the groove (15); A heating element is provided inside the upper shell (2) and the lower shell (3). When the heating element is heated, the expansion sealing strip (16) expands, thereby causing the metal sheet (17) and the elastic sealing gasket (8) to deform and expand, thereby further sealing the connection between the upper shell (2) and the lower shell (3); A coupler housing (4) is fixedly mounted on the top of the inner cavity of the upper shell (2), a coupler body (5) is fixedly mounted inside the coupler housing (4), and a liquid level sensor for detecting the water level in the kettle body (1) is arranged on the inner cavity side wall of the kettle body (1), and elastic members are arranged inside the coupler housing (4) and on the surface of the coupler body (5); When the liquid level sensor detects that the water level in the kettle body (1) reaches a corresponding position, its elastic member can move the coupler body (5) downward from the coupler housing (4), so that the coupler body (5) can be plugged into the base power supply for use; conversely, when the water in the kettle body (1) is lower than the corresponding position, the coupler body (5) does not move; and after moving, when the water level is lower than the corresponding position, the coupler body (5) moves upward to reset.

2. A sealing connection device for a heating plate assembly of an electric kettle according to claim 1, characterized in that: A semiconductor cooling plate (12) is fixedly mounted on the surface of the coupler housing (4), and the inner side of the semiconductor cooling plate (12) is a cold end surface (21), and the outer side is a hot end surface (20); The heating element comprises an electric heating tube (10) fixedly mounted on the top of the inner cavity of the upper shell (2), and a plurality of groups of heat conducting tubes (11) are fixedly mounted on the surface of the electric heating tube (10), and the ends of the plurality of groups of heat conducting tubes (11) away from the electric heating tube (10) are fixedly mounted on the hot end surface (20) of the semiconductor refrigeration plate (12); When the electric heating tube (10) generates heat, the heat is transferred to the hot end surface (20) of the semiconductor cooling plate (12) through the multiple groups of heat conducting tubes (11), thereby reducing the temperature of the cold end surface (21) of the semiconductor cooling plate (12), thereby further cooling the coupler body (5) in the coupler housing (4).

3. A sealing connection device for a heating plate assembly of an electric kettle according to claim 2, characterized in that: A plurality of positioning columns (13) are fixedly mounted on the bottom of the upper threaded joint (7), and a corresponding number of positioning holes (14) are opened on the top of the elastic sealing gasket (8), and the plurality of positioning columns (13) are all snap-fitted into the interior of the positioning holes (14), thereby fixing the elastic sealing gasket (8).

4. A sealing connection device for a heating plate assembly of an electric kettle according to claim 3, characterized in that: An inner cavity side wall of the lower shell (3) is provided with an internal thread ring (9), the inner cavity side wall of the internal thread ring (9) is threadedly connected to the upper threaded joint (7), and an extrusion plate (22) is also fixedly mounted on the inner cavity side wall of the lower shell (3); When the upper shell (2) and the lower shell (3) are fixed by means of the internal thread ring (9) and the upper thread joint (7), the elastic sealing gasket (8) can be squeezed by means of the squeezing plate (22).

5. A sealing connection device for a heating plate assembly of an electric kettle according to claim 4, characterized in that: A thread groove (18) is formed at the bottom of the coupler housing (4), a thread ring (19) corresponding to the thread groove (18) is fixedly mounted on the top of the lower housing (3), and a surface of the thread ring (19) is threadedly connected to the inner cavity side wall of the thread groove (18); Therefore, when the upper shell (2) and the lower shell (3) are connected and fixed, the lower shell (3) and the coupler housing (4) can also be kept relatively sealed.

6. A sealing connection device for a heating plate assembly of an electric kettle according to claim 5, characterized in that: The elastic member comprises two groups of guide grooves (23) formed on the inner cavity side wall of the coupler housing (4); the inner cavity side walls of the two groups of guide grooves (23) are slidably connected with slide bars (24); and the sides of the two groups of slide bars (24) close to each other are fixedly mounted on the surface of the coupler body (5); At the same time, a plurality of groups of elastic telescopic rods (25) capable of resetting the coupler body (5) are fixedly mounted on the top of the coupler body (5), an upper electromagnetic sheet (26) is fixedly mounted on the surface of the coupler body (5), and a lower electromagnetic sheet (27) corresponding to the upper electromagnetic sheet (26) is also fixedly mounted on the inner cavity side wall of the coupler body (4).

7. A sealing connection device for a heating plate assembly of an electric kettle according to claim 6, characterized in that: in, The expansion sealing strip (16) is made of a high temperature resistant composite material, including silicone, high temperature resistant rubber, fluororubber, etc. It not only has good high temperature resistance, but also can expand during heating. Then, through the expansion of the expansion sealing strip (16), the metal sheet (17) can be more closely attached to the inner wall of the elastic sealing gasket (8), so that the elastic sealing gasket (8) can be further sealed when it is worn.

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