Sealing device

Abstract

The embodiment of the invention relates to the field of sealing of nuclear reactors, in particular to a sealing device, which is used for sealing a cock and a reactor container of a reactor, and comprises a body connected with the reactor container on the radial outer side of the reactor container, the body is arranged to form a containing groove, and liquid metal is contained in the containing groove; the matching part is connected with the cock, the accommodating groove is divided by the matching part into a first groove located on the radial inner side and a second groove located on the radial outer side, and the bottoms of the first groove and the second groove are communicated; the heating assembly is arranged on the radial outer side of the containing groove and used for heating the liquid metal in the containing groove; the heat preservation assembly is used for preserving heat of the heating assembly and forms a heat preservation cavity in the radial outer side of the body, and the heating assembly is arranged in the heat preservation cavity and makes heat conduction contact with the body. The sealing device provided by the embodiment of the invention can be used for sealing through the liquid metal; and meanwhile, liquid metal can be prevented from corroding the heating assembly, and the service life of the heating assembly can be prolonged.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of sealing devices for nuclear reactors, and in particular to a sealing device. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] The plug is installed on the reactor vessel of the reactor to prevent the leakage of radioactive gas or radioactive aerosol in the reactor vessel, and to locate the position of components in the reactor vessel by rotation. It plays an important role in the normal operation of the reactor.

[0004] In order to ensure that the plug can function, it is necessary to seal the plug and the stack container. The commonly used sealing method at present is to set a sealing ring at the position where sealing is required. However, due to the presence of radioactive substances in the stack container, the sealing ring set on the plug and the stack container will be affected by the radioactive substances in the stack container, resulting in poor sealing effect and shortened service life; and because the plug needs to be turned to locate the position of the component in the stack container, it will also affect the sealing ring, affecting its sealing effect and service life. Summary of the invention

[0005] A brief overview of the present application is provided below in order to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0006] In order to ensure the sealing effect and service life, liquid metal is usually used to seal the plug and the stack container. When the plug does not rotate, the solidified liquid metal is used to statically seal the plug and the stack container; when the plug rotates, the liquid metal is used to dynamically seal the plug and the stack container. However, in the related art, the temperature measuring element used to measure the temperature of the liquid metal and the heating element used to heat the liquid metal are usually located below the liquid metal surface, causing the liquid metal to corrode the temperature measuring element and the heating element; and when the liquid metal solidifies, the solidified liquid metal may cause damage to the temperature measuring element and the heating element located below the liquid metal surface; and in the related art, the temperature measuring element and the heating element are usually set on the plug. When the plug rotates, the temperature measuring element and the heating element will also rotate relative to the liquid metal, which aggravates the corrosion of the two.

[0007] In view of the above problems, an embodiment of the present application provides a sealing device for sealing the reactor's plug and stack container, the sealing device comprising a body, a fitting, a heating assembly and a heat preservation assembly. The body is connected to the stack container on the radial outer side of the stack container, the body is arranged to form a receiving groove, and the receiving groove contains liquid metal; the fitting is connected to the plug, the fitting separates the receiving groove into a first groove located on the radial inner side and a second groove located on the radial outer side, and the bottoms of the first groove and the second groove are connected; the heating assembly is arranged on the radial outer side of the receiving groove, and is used to heat the liquid metal in the receiving groove; the heat preservation assembly is used to keep the heating assembly warm, the heat preservation assembly forms a heat preservation cavity on the radial outer side of the body, the heating assembly is arranged in the heat preservation cavity, and is in thermal contact with the body.

[0008] The sealing device provided in the embodiment of the present application separates the receiving groove connected to the stack container into a first groove and a second groove that are connected through a matching piece connected to the plug, so that the liquid metal in the receiving groove can seal the plug and the stack container; at the same time, by arranging the heating component outside the receiving groove containing the liquid metal, it is possible to avoid corrosion of the heating component by the liquid metal, and it is also possible to avoid damage to the heating component by the solidified liquid metal, which is beneficial to improving the service life of the heating component; and by insulating the heating component through the heat preservation component, it is possible to reduce the heat loss of the heating component to ensure the heating effect of the heating component on the liquid metal. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Other objects and advantages of the present application will become apparent from the following description of the embodiments of the present application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the present application.

[0010] Figure 1 It is a schematic diagram of the structure of the sealing device provided in the embodiment of the present application after being assembled with the stopcock and the stack container.

[0011] Figure 2 yes Figure 1 A schematic diagram of the structure of the heating element of the test device in the heat preservation chamber is shown.

[0012] Figure 3 yes Figure 2 Schematic diagram of the cross-section of the structure at AA.

[0013] Figure 4 yes Figure 1 A partial schematic diagram of the sealing device is shown.

[0014] Figure 5 yes Figure 1 A schematic structural diagram of the main body and the heat preservation component of the sealing device is shown.

[0015] Figure 6 yes Figure 1A schematic diagram showing the connection between a connecting piece and a matching piece of a sealing device is shown.

[0016] Description of reference numerals:

[0017] 100. Sealing device;

[0018] 10. body; 11. first ring member; 12. second ring member; 13. annular connecting member; 131. groove;

[0019] 101, receiving groove; 1011, first groove; 1012, second groove; 102, additional layer;

[0020] 20. Matching member; 30. Heating assembly; 31. Heating section; 311. First heating section; 312. Second heating section; 313. First connecting section; 314. Second connecting section;

[0021] 40. Insulation assembly; 41. First L-shaped mounting member; 42. Second L-shaped mounting member; 43. First insulation material; 44. Second insulation material; 441. Abutment portion; 442. Embedding portion; 45. Separator;

[0022] 401, insulation cavity; 4011, arc-shaped cavity section; 402, L-shaped installation cavity;

[0023] 50. Temperature measuring component; 60. Heat conducting component; 61. Measuring slot;

[0024] 70. Anti-oxidation layer; 80. Connector; 81. Hole;

[0025] 90. Sealing parts; 1001. Insulation parts;

[0026] 200, stack container; 300, liquid metal; 400, stopcock; 410, main body; 420, extension part.

[0027] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding. DETAILED DESCRIPTION

[0028] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.

[0029] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not very relevant to the present application are omitted.

[0030] See also Figure 1 An embodiment of the present application provides a sealing device 100 for sealing a reactor plug 400 and a reactor container 200. The sealing device 100 includes a body 10, a fitting 20, a heating assembly 30 and a heat preservation assembly 40. The main body 10 is connected to the stack container 200 on the radial outer side of the stack container 200, and the main body 10 is configured to form a receiving groove 101, in which liquid metal 300 is contained; the fitting 20 is connected to the plug 400, and the fitting 20 separates the receiving groove 101 into a first groove 1011 located on the radial inner side and a second groove 1012 located on the radial outer side, and the bottoms of the first groove 1011 and the second groove 1012 are connected; the heating component 30 is arranged on the radial outer side of the receiving groove 101, and is used to heat the liquid metal 300 in the receiving groove 101; the heat preservation component 40 is used to keep the heating component 30 warm, and the heat preservation component 40 forms a heat preservation cavity 401 on the radial outer side of the main body 10, and the heating component 30 is arranged in the heat preservation cavity 401, and is in thermal contact with the main body 10.

[0031] The sealing device 100 provided in the embodiment of the present application is provided with a matching piece 20 connected to the plug 400 and a main body 10 connected to the stack container 200, and the matching piece 20 separates the receiving groove 101 of the main body 10 into a first groove 1011 and a second groove 1012 that are connected, so that the liquid metal 300 in the receiving groove 101 can be used to seal the plug 400 and the stack container 200; at the same time, by arranging the heating component 30 outside the receiving groove 101 containing the liquid metal 300, it is possible to avoid corrosion of the heating component 30 by the liquid metal 300, and it is also possible to avoid damage to the heating component 30 by the solidified liquid metal 300, which is beneficial to improving the service life of the heating component 30; and by keeping the heating component 30 warm by the heat preservation component 40, it is possible to reduce the heat loss of the heating component 30 to ensure the heating effect of the heating component 30 on the liquid metal 300.

[0032] In some embodiments, the heat preservation cavity 401 and the receiving groove 101 are both annular, and correspondingly, the matching member 20 is an annular member.

[0033] In some embodiments, the material of the fitting 20 may be nickel. In such an embodiment, the fitting 20 made of nickel has good wettability with the liquid metal 300, which can increase the bonding between the fitting 20 and the liquid metal 300 and avoid the generation of gaps, so as to prevent the gas or aerosol in the stack container 200 from leaking from the gap between the liquid metal 300 and the fitting 20.

[0034] See also Figure 1 In some embodiments, the bottom of the heat preservation chamber 401 is lower than the bottom of the containing tank 101 , and the top of the heat preservation chamber 401 is higher than the liquid level of the liquid metal 300 in the containing tank 101 .

[0035] In some embodiments, when injecting liquid metal 300 into the containing tank 101, the injection height of the liquid metal 300 is related to the pressure in the stack container 200 (the pressure in the stack container 200 includes the pressure under the material replacement condition and the operating condition), and the injection height of the liquid metal 300 should avoid causing pressure fluctuations in the stack container 200.

[0036] See also Figure 1 In some embodiments, the sealing device 100 may further include an anti-oxidation layer 70, which is disposed in the receiving tank 101 and located above the liquid metal 300 to prevent the liquid metal 300 from being oxidized. Since the temperature of the liquid metal 300 is relatively high, it is easily oxidized after contacting the air. In such an embodiment, the anti-oxidation layer 70 located above the liquid metal 300 can separate the liquid metal 300 from the external air, thereby preventing the liquid metal 300 from being oxidized due to contact with the external air. The anti-oxidation layer 70 is, for example, benzyl silicone oil.

[0037] In some embodiments, the anti-oxidation layer 70 is disposed above the liquid metal 300 in the second tank 1012. In some embodiments, the injection amount (or height) of the anti-oxidation layer 70 injected into the containing tank 101 is related to the pressure in the stack container 200 and the height of the liquid metal 300 in the containing tank 101. The injection amount of the anti-oxidation layer 70 should avoid the pressure in the stack container 200 fluctuating and causing the anti-oxidation layer 70 to overflow the containing tank 101.

[0038] See also Figure 2In some embodiments, the heat preservation cavity 401 is divided into a plurality of arc-shaped cavity segments 4011 along the circumferential direction, and the heating assembly 30 may include a plurality of heating segments 31, each of which is disposed in one arc-shaped cavity segment 4011. Since the diameter of the reactor is relatively large, the diameter of the sealing device 100 is also correspondingly relatively large, so the heat loss of the heating assembly 30 is relatively obvious. In such an embodiment, each heating segment 31 is disposed in one arc-shaped cavity segment 4011, which is conducive to reducing the heat loss of the heating segment 31, and further conducive to reducing the heat loss of the heating assembly 30. When a single heating segment 31 is damaged, it is only necessary to disassemble the corresponding arc-shaped cavity segment 4011, take out the heating segment 31 for replacement or repair, and the other heating segments 31 and arc-shaped cavity segments 4011 can be kept in their original state.

[0039] In some embodiments, the heating section 31 can heat the liquid metal 300 by electrical heating.

[0040] See also Figure 2 In some embodiments, a plurality of heating segments 31 are arranged in parallel. In such an embodiment, when one or more heating segments 31 are damaged, the remaining heating segments 31 can still work normally, and the heating effect on the liquid metal 300 is not affected.

[0041] In some embodiments, the heat preservation assembly 40 may further include a plurality of partitions 45 for separating the plurality of arc-shaped cavity segments 4011 from each other. In some embodiments, two partitions 45 are provided between two adjacent arc-shaped cavity segments 4011, and a heat preservation segment is formed between the two partitions 45, so as to facilitate heat insulation between the two adjacent arc-shaped cavity segments 4011, thereby facilitating the stability of the temperature in each arc-shaped cavity segment 4011, facilitating the temperature adjustment, and when one arc-shaped cavity segment 4011 is repaired, the heat preservation of another arc-shaped cavity segment 4011 is not affected.

[0042] See also Figure 2 In some embodiments, each heating section 31 includes two first heating sections 311 extending from outside the arc-shaped cavity section 4011 into the arc-shaped cavity section 4011, two second heating sections 312 extending inside the arc-shaped cavity section 4011 and located between the two first heating sections 311, two first connecting sections 313 respectively connecting the bottom end of a first heating section 311 and the bottom end of a second heating section 312, and a second connecting section 314 connecting the top ends of the two second heating sections 312, wherein the two first connecting sections 313 are in contact with the bottom wall of the arc-shaped cavity section 4011. In such an embodiment, it is beneficial to improve the heating effect of the heating section 31 on the liquid metal 300.

[0043] See also Figure 3In some embodiments, the insulation component 40 may include a first L-shaped mounting member 41, a second L-shaped mounting member 42, a first insulation material 43, and a second insulation material 44. The first L-shaped mounting member 41 and the second L-shaped mounting member 42 are connected to the body 10, and the first L-shaped mounting member 41 and the second L-shaped mounting member 42 together form an L-shaped mounting cavity 402; the first insulation material 43 is filled in the L-shaped mounting cavity 402; the first L-shaped mounting member 41 and the body 10 form an insulation cavity 401, and the top of the insulation cavity 401 forms an opening; the second insulation material 44 is used to close the opening of the insulation cavity 401. In such an embodiment, the first insulation material 43 and the second insulation material 44 can cover the heating section 31 in the insulation cavity 401 more comprehensively to obtain a better insulation effect and reduce the heat loss of the heating section 31.

[0044] See also Figure 2 In some embodiments, the two second heating segments 312 , the two first connecting segments 313 , and the second connecting segment 314 are located below the second thermal insulation material 44 , and the two first heating segments 311 extend through the second thermal insulation material 44 to the outside of the arc-shaped cavity segment 4011 .

[0045] In some embodiments, the first thermal insulation material 43 may be rock wool. When the rock wool is filled into the L-shaped installation cavity 402, the rock wool crushed into filaments or granules may be filled into the L-shaped installation cavity 402 and lightly compacted to ensure the compactness of the rock wool in the L-shaped installation cavity 402, avoid affecting the thermal insulation effect, and avoid causing damage to the first L-shaped installation component 41 and the second L-shaped installation component 42.

[0046] In other embodiments, the first heat insulating material 43 may also be granular cotton.

[0047] In some embodiments, the second heat-insulating material 44 may be a heat-insulating material that can be processed into a fixed shape, so that the second heat-insulating material 44 is integrally formed into a cover to close the upper opening of the heat-insulating cavity 401. The cover may include an embedding portion 442 and an abutting portion 441, wherein the embedding portion 442 is embedded in the upper opening of the heat-insulating cavity 401, and the abutting portion 441 abuts against the first L-shaped mounting member 41 and the first heat-insulating material 43 to position the cover.

[0048] In some embodiments, the second heat-insulating material 44 may be solid calcium silicate. Solid calcium silicate generally has good high temperature resistance and is easy to shape.

[0049] See also Figure 4In some embodiments, the sealing device 100 may further include a plurality of temperature measuring elements 50 for measuring the temperature of the body 10 in the plurality of arc-shaped cavity segments 4011, respectively. In such an embodiment, the heating segment 31 can be adjusted according to the temperature measured by the temperature measuring element 50, so that the temperature of the liquid alloy in the receiving tank 101 of the body 10 is at a preset temperature. The temperature measuring element 50 is, for example, a thermocouple.

[0050] See also Figure 4 In some embodiments, the sealing device 100 may further include a plurality of heat conducting members 60, each of which is disposed in an arc-shaped cavity section 4011, the heat conducting member 60 is in thermal contact with the body 10, the heat conducting member 60 forms a measuring groove 61, and the temperature measuring member 50 is disposed in the measuring groove 61 for measuring the temperature of the body 10. In such an embodiment, the heat of the body 10 can be transferred to the temperature measuring member 50 through the heat conducting member 60, which is conducive to improving the accuracy of the temperature measured by the temperature measuring member 50.

[0051] See also Figure 4 and Figure 5 In some embodiments, the sealing device 100 may further include an additional layer 102, which is disposed on the groove wall of the receiving groove 101 to prevent an air gap between the liquid metal 300 and the groove wall of the receiving groove 101. Since the air gap between the liquid metal 300 and the groove wall of the receiving groove 101 will affect the sealing performance of the sealing device 100, in such an embodiment, the additional layer 102 enables the groove wall of the receiving groove 101 to have good wettability with the liquid metal 300, and can increase the bonding between the groove wall and the liquid metal 300, thereby preventing the gas or aerosol in the stack container 200 from leaking from the air gap between the liquid metal 300 and the groove wall of the receiving groove 101.

[0052] See also Figure 4 and Figure 5 In some embodiments, a groove 131 may be formed where the bottom wall and the side wall of the receiving groove 101 meet, and the bottom end of the additional layer 102 may be inserted into the groove 131 to prevent the gas or aerosol in the stack container 200 from escaping along the side wall of the receiving groove 101 in the form of bubbles.

[0053] In some embodiments, the liquid metal 300 may be a tin-bismuth alloy, and the additional layer 102 may be a nickel plate welded to the wall of the receiving tank 101. Since the tin-bismuth alloy is relatively stable and has a low melting point (melting point is 120°C to 130°C), it is easy to melt into a liquid state after heating. Therefore, in the embodiment of the present application, the tin-bismuth alloy is selected to seal the plug 400 and the stack container 200; at the same time, since the tin-bismuth alloy and nickel have good wettability, the nickel plate is selected as the additional layer 102, which is conducive to increasing the bonding between the wall of the receiving tank 101 and the tin-bismuth alloy and preventing the existence of air gaps.

[0054] See also Figure 4 and Figure 5 In some embodiments, the body 10 may include a first ring 11, a second ring 12, and an annular connector 13. The first ring 11 is used to be welded to the opening periphery of the stack container 200 on the radial outer side of the stack container 200; the second ring 12 is arranged on the radial outer side of the first ring 11; the annular connector 13 is used to connect the first ring 11 and the second ring 12 to form a receiving groove 101 together with the second ring 12 and the first ring 11. In such an embodiment, the receiving groove 101 can be connected to the stack container 200 through the above arrangement, so that the liquid metal 300 in the receiving groove 101 can seal the stack container 200.

[0055] In some embodiments, the groove 131 is formed at a position where the annular connector 13 is connected to the first ring member 11 and the second ring member 12 .

[0056] In some embodiments, the first L-shaped mounting member 41 and the second ring member 12 form a heat preservation cavity 401 , and the heat conductive member 60 is in heat conductive contact with the second ring member 12 .

[0057] See also Figure 1 In some embodiments, the tap 400 may include a body portion 410 and an extension portion 420, wherein the extension portion 420 extends upward from the radial inner side of the opening of the stack container 200 to be higher than the opening of the stack container 200. Figure 1 and Figure 6 In some embodiments, the sealing device 100 may further include a connector 80 and a seal 90. The fitting 20 is connected to the connector 80, which is welded to the extension portion 420 of the plug 400. The connector 80 is located above the first ring 11, and the connector 80 is located radially inward of the second ring 12, facing the second ring 12; the seal 90 is disposed between the connector 80 and the second ring 12, and is used to seal the second groove 1012. In such an embodiment, the fitting 20 can be connected to the plug 400 through the connector 80, and the connector 80 is connected to the plug 400 by welding, so that the sealing of the stack container 200 can be ensured; and the second groove 1012 is sealed by the seal 90, so that the gas or aerosol in the stack can be prevented from leaking to the outside of the sealing device 100. The seal 90 is, for example, a rubber seal ring.

[0058] In some embodiments, the connecting piece 80 may be made of stainless steel, and the fitting 20 and the connecting piece 80 are connected by welding.

[0059] In some embodiments, the connector 80 is formed with a hole 81 for checking the welding condition of the connector 80 and the extension 420. Specifically, the hole 81 can be inflated with gas, and if there is gas leakage at the welding point between the connector 80 and the extension 420, the connector 80 and the extension 420 are not completely welded or there is leakage at the weld; if there is no gas leakage at the welding point between the connector 80 and the extension 420, the connector 80 and the extension 420 are firmly welded and there is no leakage at the weld.

[0060] See also Figure 1 In some embodiments, the sealing device 100 may further include a heat-insulating member 1001, which is disposed radially inwardly of the extension portion 420 and is used to insulate the portion where the extension portion 420 is connected to the connector 80, so as to reduce the heat diffused outward from the connector 80. The heat-insulating member 1001 can insulate the air cavity above the liquid metal in the first groove 1011, thereby ensuring that the temperature of the liquid metal 300 in the first groove 1011 can be stably increased.

[0061] The heat-insulating member 1001 is, for example, rock wool. The upper end of the heat-insulating member 1001 may be substantially flush with the extension portion 420 and the connecting member 80 , and the lower end thereof may be substantially flush with the opening of the stack container 200 .

[0062] In some embodiments, the sealing device 100 may further include a control system for controlling the heating assembly 30 to adjust the temperature of the liquid metal 300 to ensure that the liquid metal 300 is in a liquid state. Specifically, when the plug 400 rotates, the control system may control the heating section 31 to heat the solidified liquid metal 300 so that the solidified liquid metal 300 is restored to a liquid state and is always kept in a liquid state, so as to dynamically seal the plug 400 and the stack container 200.

[0063] The following describes a process of sealing the tap 400 and the stack container 200 using the sealing device 100 provided in the embodiment of the present application.

[0064] First, the first ring 11 is welded to the opening periphery of the stack container 200, and a certain amount of tin-bismuth alloy 300 is injected into the containing groove 101; then, a certain amount of benzyl silicone oil 70 is injected into the upper layer of the tin-bismuth alloy 300 in the second groove 1012, the connecting piece 80 is welded to the extension part 420 of the plug 400, and the matching piece 20 is inserted into the tin-bismuth alloy 300.

[0065] When the plug 400 does not need to be rotated, the tin-bismuth alloy 300 solidifies, and the plug 400 and the stack container 200 are statically sealed; when the plug 400 needs to be rotated, the heating section 31 is started to melt the tin-bismuth alloy 300, and the temperature of the tin-bismuth alloy 300 is controlled by the control system so that the tin-bismuth alloy 300 is always in a liquid state, and the plug 400 and the stack container 200 are dynamically sealed.

[0066] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0067] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A sealing device for sealing the reactor cock and the reactor vessel, It is characterized in that The sealing device comprises: A body, the body being connected to the stack container at a radially outer side of the stack container, the body being arranged to form a receiving groove, wherein the receiving groove receives liquid metal; A fitting piece connected to the plug, the fitting piece divides the receiving groove into a first groove located radially inward and a second groove located radially outward, the bottoms of the first groove and the second groove being connected; A heating assembly, disposed radially outside the containing tank, for heating the liquid metal in the containing tank; A heat preservation component, used for keeping the heating component warm; The heat preservation component forms a heat preservation cavity on the radial outer side of the body, and the heating component is arranged in the heat preservation cavity and is in thermal contact with the body.

2. The sealing device according to claim 1, It is characterized in that The heat preservation cavity is divided into a plurality of arc-shaped cavity segments along the circumferential direction, and the heating component comprises a plurality of heating segments, each of which is arranged in one of the arc-shaped cavity segments.

3. The sealing device according to claim 2, It is characterized in that Each of the heating sections includes two first heating sections extending from outside the arc-shaped cavity section into the arc-shaped cavity section, two second heating sections extending inside the arc-shaped cavity section and located between the two first heating sections, two first connecting sections respectively connecting the bottom end of one of the first heating sections and the bottom end of one of the second heating sections, and a second connecting section connecting the top ends of the two second heating sections, wherein the two first connecting sections are in contact with the bottom wall of the arc-shaped cavity section.

4. The sealing device according to claim 1, It is characterized in that The thermal insulation component comprises: A first L-shaped mounting member and a second L-shaped mounting member are connected to the body, and the first L-shaped mounting member and the second L-shaped mounting member together form an L-shaped mounting cavity; A first thermal insulation material is filled in the L-shaped installation cavity; The first L-shaped mounting member and the body form the heat preservation cavity, and the top of the heat preservation cavity forms an opening; The second heat-insulating material is used to seal the opening of the heat-insulating cavity.

5. The sealing device according to claim 2, It is characterized in that Also includes: A plurality of temperature measuring components are used to measure the temperature of the body in the plurality of arc-shaped cavity segments respectively.

6. The sealing device according to claim 5, It is characterized in that Also includes: A plurality of heat-conducting members, each of which is disposed in one of the arc-shaped cavity segments, and the heat-conducting member is in heat-conducting contact with the body; The heat conducting member further forms a measuring slot, and the plurality of temperature measuring members are arranged in the measuring slot for measuring the temperature of the body.

7. The sealing device according to claim 1, It is characterized in that Also includes: The anti-oxidation layer is arranged in the containing tank and located above the liquid metal, and is used to prevent the liquid metal from being oxidized.

8. The sealing device according to claim 1, It is characterized in that Also includes: The additional layer is arranged on the groove wall of the containing groove to prevent the existence of an air gap between the liquid metal and the groove wall of the containing groove.

9. The sealing device according to claim 8, It is characterized in that The liquid metal is a tin-bismuth alloy, and the additional layer is a nickel plate welded to the wall of the containing tank.

10. The sealing device according to claim 8, It is characterized in that The body comprises: A first ring member, used for welding to the opening periphery of the stack container on the radial outer side of the stack container; A second ring member, disposed radially outside the first ring member; an annular connecting member, used to connect the first ring member and the second ring member, so as to form the containing groove together with the second ring member and the first ring member; The tap comprises a body portion and an extension portion, wherein the extension portion extends upwardly from the radial inner side of the opening of the stack container to a position higher than the opening of the stack container; The sealing device also includes: A connecting piece, the matching piece is connected to the connecting piece, the connecting piece is welded to the extension portion of the cock, the connecting piece is located above the first ring piece, the connecting piece is located radially inside the second ring piece, and faces the second ring piece; A sealing member is disposed between the connecting member and the second ring member and is used for sealing the second groove.

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