Sealing device

Abstract

The invention relates to the technical field of sealing devices, in particular to a sealing device which comprises a sealing assembly and a mounting assembly. The sealing assembly comprises a sealing ring and an annular spring arranged in the sealing ring, the sealing ring is formed in a mold injection molding mode, the sealing ring is of an annular hollow structure, an annular installation notch is formed in the inner ring face of the sealing ring, and the annular spring is clamped into the sealing ring after the sealing ring is formed and cooled. According to the sealing device, the sealing assembly and the mounting assembly are arranged, so that in the actual use process of the sealing device, a sealing ring can be extruded through a lower pressing cover, and effective sealing is achieved under the action of the sealing ring and an annular spring; and meanwhile, under the action of the annular spring, the sealing ring and the plating layer, the sealing device can keep stable sealing performance under the working conditions of ultrahigh working pressure of 45 MPa and high temperature of 400 DEG C, so that the durability and creep resistance of a sealing piece are remarkably improved, and the service life of the device is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of sealing devices, and in particular to a sealing device. Background Art

[0002] A sealed container is one that prevents the ingress of air, moisture, microorganisms, and other substances, thereby maintaining a relatively stable internal environment. Sealed containers typically have the following characteristics: Their sealed structure effectively isolates them from the outside world, preventing moisture, oxygen, dust, and other substances from entering the container. They are often used to store items that are easily oxidized, susceptible to moisture, prone to deterioration, and easily contaminated, such as food, medicine, and cosmetics. They are suitable for long-term storage, extending the shelf life of items. Most sealed containers are highly reusable and environmentally friendly.

[0003] At present, the basic requirements for containers are sufficient strength, rigidity and sealing. However, the country only has relevant regulations for sealing structures with a design pressure not exceeding 35MPa. To meet customer needs, a sealing device with a working pressure of 45MPa and an operating temperature of 400℃ was developed. Summary of the Invention

[0004] The purpose of this application is to provide a sealing device.

[0005] In a first aspect, the present application provides a sealing device that adopts the following technical solution: A sealing device comprising: Sealing assemblies and mounting assemblies; The sealing assembly includes a sealing ring and an annular spring arranged inside the sealing ring. The sealing ring is formed by mold injection. The sealing ring is an annular hollow structure, and an annular mounting notch is opened on the inner ring surface of the sealing ring. The annular spring is clamped into the interior of the sealing ring after the sealing ring is formed and cooled. The mounting assembly includes a mounting groove welded to the inlet and outlet ends of the pressure vessel, the sealing assembly is arranged inside the mounting groove, and the mounting assembly also includes an annular chamfer opened at the annular corner inside the mounting groove, and a lower pressure cover is arranged above the mounting groove.

[0006] Preferably, the sealing ring is made of fluororubber, and the annular spring is made of stainless steel.

[0007] By adopting the above technical solution, the sealing component has the properties of high temperature resistance and high corrosion resistance.

[0008] Preferably, the outer surface of the sealing ring is sprayed with a coating after being injection-molded by a mold, and the material of the coating is a nickel-chromium alloy.

[0009] By adopting the above technical solution, the sealing component has high pressure resistance, which mainly includes the following aspects: Corrosion resistance: The nickel-chromium alloy coating has good corrosion resistance and can effectively resist chemical corrosion and oxidation, protecting the base material from damage; Hardness and wear resistance: The coating can increase the hardness and wear resistance of the material and extend its service life; Heat resistance: The specially treated coating exhibits good heat resistance at high temperatures.

[0010] Preferably, a first reinforcement component and a second reinforcement component are respectively provided on the top of the installation groove, and the first reinforcement component and the second reinforcement component are both used to further seal the gap between the lower pressure cover and the installation groove.

[0011] By adopting the above technical solution, the sealing performance of the device can be further improved through the first reinforcement component and the second reinforcement component.

[0012] Preferably, the first reinforcement component includes an annular cavity opened inside the installation groove body, and a sliding ring slidably arranged on the inner wall of the annular cavity, and an annular inflatable airbag is fixedly provided on the inner bottom wall of the annular cavity, and the top of the annular inflatable airbag is fixedly connected to the lower surface of the sliding ring.

[0013] By adopting the above technical solution, the annular inflatable airbag can be squeezed by the movement of the sliding ring.

[0014] Preferably, the inner top wall of the annular cavity is provided with six sliding holes in a circumferential array, the inner wall of the sliding hole is slidably provided with a pressure column, the bottom end of the pressure column is fixedly connected to the upper surface of the sliding ring, and the top ends of the six pressure columns are fixed with a connecting ring.

[0015] By adopting the above technical solution, when the lower pressure cover moves downward, the sliding ring can be moved by pressing the pressure column.

[0016] Preferably, the first reinforcement component also includes an annular mounting groove provided on the upper surface of the mounting groove, the inner wall of the annular mounting groove is fixedly provided with an expansion sealing airbag ring, the inner bottom wall of the expansion sealing airbag ring is provided with a first inflation tube extending to the inner wall of the annular cavity, the outer ring surface of the sliding ring is fixedly provided with an annular rubber ring, and the interior of the sliding ring is provided with six rectangular cavities in a circumferential array, the surfaces of the rectangular cavity and the annular rubber ring are provided with connecting holes, and the connecting holes correspond to the bottom end of the first inflation tube, and the inner top wall of the annular inflation airbag is provided with a connecting tube extending to the inside of the rectangular cavity.

[0017] By adopting the above technical solution, when the sliding ring moves downward to the connecting hole corresponding to the first inflation tube, the lower surface of the lower pressure cover is just in contact with the upper surface of the mounting groove. At this time, the air in the annular inflatable airbag can enter the interior of the expansion sealing airbag ring through the connecting hole and the first inflation tube, causing the expansion sealing airbag ring to expand.

[0018] Preferably, the interior of the annular inflatable airbag and the expansion sealing airbag ring are respectively provided with a plurality of first return springs and second return springs in a circumferential array, the inner wall of the annular inflatable airbag is provided with an air intake pipe extending to the outer surface of the mounting groove, and the surface of the air intake pipe is provided with an air intake one-way valve.

[0019] By adopting the above technical solution, the annular inflatable airbag and the expansion sealing airbag ring can be easily reset, and the annular inflatable airbag can be easily used to absorb external air into the interior of the annular inflatable airbag.

[0020] Preferably, the second reinforcement component includes a plug-in ring fixed on the outer surface of the mounting groove, and a plug-in groove opened on the lower surface of the lower pressure cover and corresponding to the plug-in ring, the plug-in ring is provided with an annular mounting cavity inside, the inner wall of the annular mounting cavity is provided with an inner expansion airbag ring, the inner ring surface of the inner expansion airbag ring is provided with a plurality of rectangular plug-ins in a circular array, the inner ring surface of the plug-in ring is provided with a rectangular hole extending to the inside of the annular mounting cavity and slidingly connected to the outer surface of the rectangular plug-in block, the inner wall of the plug-in groove is provided with an annular limit groove adapted to the plurality of rectangular plug-ins.

[0021] By adopting the above technical solution, when the lower pressure cover moves downward, the plug-in ring can be inserted into the plug-in groove. When the expansion sealing airbag ring expands, part of the gas in the expansion sealing airbag ring can enter the interior of the inner expansion airbag ring through the second inflation tube, causing the inner expansion airbag ring to expand, thereby driving the rectangular plug block to be inserted into the annular limit groove in the plug-in groove, thereby realizing effective limitation between the lower pressure cover and the installation groove.

[0022] Preferably, the inner wall of the inner inflatable airbag ring is provided with a second inflation tube extending to the inside of the inflatable sealing airbag ring, and the inner wall of the inflatable sealing airbag ring is provided with a deflation tube extending to the outer surface of the plug ring, and the end of the deflation tube is provided with a sealing plug. By adopting the above technical solution, the inflation sealing airbag ring and the inner inflation airbag ring can be quickly deflated through the deflation tube.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. By providing a sealing assembly and a mounting assembly, the present invention enables the sealing device to compress the sealing ring through the lower gland during actual use, achieving effective sealing under the action of the sealing ring and the annular spring. Furthermore, the annular spring, sealing ring, and coating enable the sealing device to maintain stable sealing performance under ultra-high working pressures of 45 MPa and high temperatures of 400°C, thereby significantly improving the durability and creep resistance of the seal and extending the service life of the device. 2. The present invention provides a first reinforcement component. When the lower gland is subjected to an external force downward, the lower gland can squeeze the connecting ring downward, thereby causing the six pressure columns to move downward, pressing the sliding ring downward, driving the sliding ring to move downward, and causing the sliding ring to squeeze the annular inflatable airbag. When the sliding ring moves downward until the connecting hole corresponds to the first inflatable tube, the lower surface of the lower gland fits exactly with the upper surface of the mounting groove. At this time, the air in the annular inflatable airbag can enter the interior of the expansion sealing airbag ring through the connecting hole and the first inflatable tube, causing the expansion sealing airbag ring to expand, thereby further effectively sealing the gap between the lower gland and the mounting groove, further improving the sealing performance of the device. 3. The present invention sets a second reinforcement component, and when the lower pressure cover moves downward, the plug-in ring can be inserted into the plug-in groove. When the expansion sealing airbag ring expands, part of the gas in the expansion sealing airbag ring can enter the interior of the inner expansion airbag ring through the second inflation tube, causing the inner expansion airbag ring to expand, thereby driving the rectangular plug block to be inserted into the annular limit groove in the plug-in groove, realizing effective limitation between the lower pressure cover and the installation groove, thereby ensuring the stability of the lower pressure cover after connection with the installation groove, and further improving the sealing performance of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present application; Figure 2 This is a schematic diagram of the explosion structure of Example 1 of the present application; Figure 3 2 is a schematic cross-sectional view of the first embodiment of the present application; Figure 4 This is a schematic diagram of the overall structure of Example 2 of the present application; Figure 5 is a schematic cross-sectional view of the second embodiment of the present application; Figure 6 This application Figure 5 Enlarged structural diagram at point A in the middle.

[0025] Description of reference numerals: 100, sealing assembly; 101, sealing ring; 102, annular spring; 103, annular mounting notch; 200, mounting assembly; 201, mounting groove; 202, annular chamfer; 300, lower cover; 400, first reinforcement assembly; 401, sliding ring; 402, annular inflatable airbag; 403, pressure column; 404, connecting ring; 405, expansion sealing airbag ring; 406, first inflatable tube; 407, annular rubber ring; 408, rectangular cavity; 409, connecting hole; 4010, connecting tube; 4011, first return spring; 4012, second return spring; 4013, intake pipe; 4014, intake check valve; 500, second reinforcement component; 501, plug-in ring; 502, plug-in groove; 503, inner inflation airbag ring; 504, rectangular plug block; 505, annular limiting groove; 506, second inflation tube; 507, deflation tube. DETAILED DESCRIPTION

[0026] The following combination Figures 1 to 6 , further details of this application are given.

[0027] Example 1 A sealing device, referring to Figures 1 to 3 , including: a sealing assembly 100 and an installation assembly 200; the sealing assembly 100 includes a sealing ring 101 and an annular spring 102 arranged inside the sealing ring 101, the sealing ring 101 is formed by mold injection, the sealing ring 101 is an annular hollow structure, and the inner ring surface of the sealing ring 101 is provided with an annular installation notch 103, the annular spring 102 is inserted into the inside of the sealing ring 101 after the sealing ring 101 is formed and cooled; the installation assembly 200 includes a mounting groove 201 welded and installed at the inlet and outlet ends of the pressure vessel, the sealing assembly 100 is arranged inside the mounting groove 201, and the installation assembly 200 also includes an annular chamfer 202 opened at the annular corner inside the mounting groove 201, and a lower pressure cover 300 is provided above the mounting groove 201.

[0028] Please refer to Figure 3 The material of the sealing ring 101 is fluororubber, and the material of the annular spring 102 is stainless steel.

[0029] Specifically, the sealing assembly 100 has high temperature resistance and high corrosion resistance, which mainly include the following aspects: Corrosion resistance: The nickel-chromium alloy coating has good corrosion resistance and can effectively resist chemical corrosion and oxidation, protecting the base material from damage; Hardness and wear resistance: The coating can increase the hardness and wear resistance of the material and extend its service life; Heat resistance: The coating that has been specially treated exhibits good heat resistance at high temperatures.

[0030] Please refer to Figure 3The outer surface of the sealing ring 101 is sprayed with a coating after being injection molded by a mold, and the coating material is a nickel-chromium alloy.

[0031] Specifically, the sealing assembly 100 has high pressure resistance.

[0032] Among them, the present invention provides a sealing component 100 and an installation component 200, so that during actual use, the sealing device can squeeze the sealing ring 101 through the lower pressure cover 300, and achieve effective sealing under the action of the sealing ring 101 and the annular spring 102. At the same time, under the action of the annular spring 102, the sealing ring 101 and the coating, the sealing device can maintain stable sealing performance under ultra-high working pressure of 45MPa and high temperature of 400°C, thereby significantly improving the durability and creep resistance of the seal and extending the service life of the device. It mainly includes the following aspects: Corrosion resistance: The nickel-chromium alloy coating has good corrosion resistance, can effectively resist chemical corrosion and oxidation, and protect the base material from damage; Hardness and wear resistance: The coating can increase the hardness and wear resistance of the material and extend its service life; Heat resistance: The coating that has undergone specific treatment exhibits good heat resistance at high temperatures.

[0033] Example 2 Based on the first embodiment, Figures 4 to 6 , and the difference from the first embodiment is that: Please refer to Figure 5 and Figure 6 A first reinforcement component 400 and a second reinforcement component 500 are respectively provided on the top of the installation groove 201. The first reinforcement component 400 and the second reinforcement component 500 are both used to further seal the gap between the lower pressure cover 300 and the installation groove 201.

[0034] Specifically, the sealing performance of the device can be further improved by the first reinforcement component 400 and the second reinforcement component 500.

[0035] Please refer to Figure 5 and Figure 6 The first reinforcement component 400 includes an annular cavity opened inside the installation groove 201, and a sliding ring 401 slidingly arranged on the inner wall of the annular cavity. An annular inflatable airbag 402 is fixedly provided on the inner bottom wall of the annular cavity, and the top of the annular inflatable airbag 402 is fixedly connected to the lower surface of the sliding ring 401.

[0036] Specifically, the annular inflatable airbag 402 can be squeezed by the movement of the sliding ring 401 .

[0037] Please refer to Figure 5 and Figure 6The inner top wall of the annular cavity is provided with six sliding holes in a circular array, and a pressure column 403 is slidingly provided on the inner wall of the sliding hole. The bottom end of the pressure column 403 is fixedly connected to the upper surface of the sliding ring 401, and a connecting ring 404 is fixed at the top of the six pressure columns 403.

[0038] Specifically, when the lower pressing cover 300 moves downward, the sliding ring 401 can be moved by pressing the pressing column 403 .

[0039] Please refer to Figure 5 and Figure 6 The first reinforcement component 400 also includes an annular mounting groove opened on the upper surface of the mounting groove 201, the inner wall of the annular mounting groove is fixedly provided with an expansion sealing airbag ring 405, the inner bottom wall of the expansion sealing airbag ring 405 is provided with a first inflation tube 406 extending to the inner wall of the annular cavity, the outer ring surface of the sliding ring 401 is fixedly provided with an annular rubber ring 407, and the interior of the sliding ring 401 is provided with six rectangular cavities 408 in a circumferential array, the surfaces of the rectangular cavities 408 and the annular rubber ring 407 are provided with connecting holes 409, and the connecting holes 409 correspond to the bottom end of the first inflation tube 406, and the inner top wall of the annular inflatable airbag 402 is provided with a connecting tube 4010 extending to the inside of the rectangular cavity 408.

[0040] Specifically, when the sliding ring 401 moves downward to the connection hole 409 corresponding to the first inflation tube 406, the lower surface of the lower pressure cover 300 is just in contact with the upper surface of the mounting groove 201. At this time, the air in the annular inflatable airbag 402 can enter the interior of the expansion sealing airbag ring 405 through the connection hole 409 and the first inflation tube 406, causing the expansion sealing airbag ring 405 to expand.

[0041] Please refer to Figure 5 and Figure 6 The interiors of the annular inflatable airbag 402 and the expansion sealing airbag ring 405 are respectively provided with a plurality of first return springs 4011 and second return springs 4012 in a circular array. The inner wall of the annular inflatable airbag 402 is provided with an air intake pipe 4013 extending to the outer surface of the mounting groove 201, and the surface of the air intake pipe 4013 is provided with an air intake one-way valve 4014.

[0042] Specifically, it can facilitate the annular inflatable airbag 402 and the expansion sealing airbag ring 405 to reset, and at the same time facilitate the annular inflatable airbag 402 to absorb external air into the interior of the annular inflatable airbag 402.

[0043] Among them, the present invention sets a first reinforcement component 400. When the lower pressure cover 300 is subjected to an external force downward, the lower pressure cover 300 can squeeze the connecting ring 404 downward, thereby moving the six pressure columns 403 downward, pressing the sliding ring 401 downward, driving the sliding ring 401 to move downward, and causing the sliding ring 401 to squeeze the annular inflatable airbag 402. When the sliding ring 401 moves downward to correspond to the connecting hole 409 and the first inflatable tube 406, the lower surface of the lower pressure cover 300 is just in contact with the upper surface of the mounting groove 201. At this time, the air in the annular inflatable airbag 402 can enter the interior of the expansion sealing airbag ring 405 through the connecting hole 409 and the first inflatable tube 406, causing the expansion sealing airbag ring 405 to expand, thereby achieving further effective sealing of the gap between the lower pressure cover 300 and the mounting groove 201, further improving the sealing performance of the device.

[0044] Please refer to Figure 5 and Figure 6 The second reinforcement component 500 includes a plug-in ring 501 fixed on the outer surface of the installation groove 201, and a plug-in groove 502 opened on the lower surface of the lower pressure cover 300 and corresponding to the plug-in ring 501. An annular installation cavity is opened inside the plug-in ring 501, and an inner expansion airbag ring 503 is fixed on the inner wall of the annular installation cavity. The inner ring surface of the inner expansion airbag ring 503 is fixed with a plurality of rectangular plug-in blocks 504 in a circular array. The inner ring surface of the plug-in ring 501 is opened with a rectangular hole extending into the inside of the annular installation cavity and slidingly connected to the outer surface of the rectangular plug-in block 504. The inner wall of the plug-in groove 502 is opened with an annular limiting groove 505 adapted to the plurality of rectangular plug-in blocks 504.

[0045] Specifically, when the lower pressure cover 300 moves downward, the plug-in ring 501 can be inserted into the plug-in groove 502. When the expansion sealing airbag ring 405 expands, part of the gas in the expansion sealing airbag ring 405 can enter the interior of the inner expansion airbag ring 503 through the second inflation tube 506, causing the inner expansion airbag ring 503 to expand, thereby driving the rectangular plug block 504 to be inserted into the annular limit groove 505 in the plug-in groove 502, thereby realizing effective limitation between the lower pressure cover 300 and the installation groove 201.

[0046] Please refer to Figure 5 and Figure 6 The inner wall of the inner expansion airbag ring 503 is provided with a second inflation tube 506 extending to the inside of the expansion sealing airbag ring 405, and the inner wall of the expansion sealing airbag ring 405 is provided with a deflation tube 507 extending to the outer surface of the plug-in ring 501, and the end of the deflation tube 507 is provided with a sealing plug.

[0047] Specifically, the deflation tube 507 can be used to quickly deflate the inflatable sealing airbag ring 405 and the inner inflatable airbag ring 503 .

[0048] Among them, the present invention sets a second reinforcement component 500, and when the lower pressure cover 300 moves downward, the plug-in ring 501 can be inserted into the plug-in groove 502. When the expansion sealing airbag ring 405 expands, part of the gas in the expansion sealing airbag ring 405 can enter the interior of the inner expansion airbag ring 503 through the second inflation tube 506, causing the inner expansion airbag ring 503 to expand, thereby driving the rectangular plug block 504 to be inserted into the annular limit groove 505 in the plug-in groove 502, realizing effective limitation between the lower pressure cover 300 and the installation groove 201, thereby ensuring the stability of the lower pressure cover 300 after being connected to the installation groove 201, and further improving the sealing performance of the device.

[0049] Working principle: During actual use, the sealing device can squeeze the sealing ring 101 through the lower gland 300 and achieve effective sealing under the action of the sealing ring 101 and the annular spring 102. At the same time, under the action of the annular spring 102, the sealing ring 101 and the coating, the sealing device can maintain stable sealing performance under ultra-high working pressure of 45 MPa and high temperature of 400°C, thereby significantly improving the durability and creep resistance of the seal and extending the service life of the device. When the lower gland 300 is subjected to an external force downward, the lower gland 300 can squeeze the connecting ring 404 downward, thereby causing the six pressure columns 403 to move downward, pressing the sliding ring 401 downward, driving the sliding ring 401 to move downward, and causing the sliding ring 401 to squeeze the annular inflatable airbag 402. When the sliding ring 401 moves downward until the connecting hole 409 corresponds to the first inflatable tube 406, the lower surface of the lower gland 300 is just in contact with the upper surface of the mounting groove 201. At this time, the air in the annular inflatable airbag 402 can enter the interior of the expansion sealing airbag ring 405 through the connecting hole 409 and the first inflatable tube 406, causing the expansion sealing airbag ring 405 to expand, thereby further effectively sealing the gap between the lower gland 300 and the mounting groove 201, further improving the sealing performance of the device. At the same time, when the lower pressure cover 300 moves downward, the plug-in ring 501 can be inserted into the plug-in groove 502. When the expansion sealing airbag ring 405 expands, part of the gas in the expansion sealing airbag ring 405 can enter the interior of the inner expansion airbag ring 503 through the second inflation tube 506, causing the inner expansion airbag ring 503 to expand, thereby driving the rectangular plug block 504 to be inserted into the annular limit groove 505 in the plug-in groove 502, realizing effective limitation between the lower pressure cover 300 and the installation groove 201, thereby ensuring the stability of the lower pressure cover 300 after being connected to the installation groove 201, and further improving the sealing performance of the device.

[0050] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A sealing device, characterized in that: include: A sealing assembly (100) and a mounting assembly (200); The sealing assembly (100) includes a sealing ring (101) and an annular spring (102) arranged inside the sealing ring (101); the sealing ring (101) is formed by mold injection; the sealing ring (101) is an annular hollow structure; and an annular mounting notch (103) is provided on the inner ring surface of the sealing ring (101); the annular spring (102) is inserted into the interior of the sealing ring (101) after the sealing ring (101) is formed and cooled; The mounting assembly (200) comprises a mounting groove (201) welded to the inlet and outlet ends of the pressure vessel, the sealing assembly (100) is arranged inside the mounting groove (201), and the mounting assembly (200) further comprises an annular chamfer (202) provided at an annular corner inside the mounting groove (201), and a lower gland (300) is arranged above the mounting groove (201).

2. A sealing device according to claim 1, characterized in that: The material of the sealing ring (101) is fluororubber, and the material of the annular spring (102) is stainless steel.

3. A sealing device according to claim 1, characterized in that: After the sealing ring (101) is injection molded, a coating is sprayed on the outer surface thereof, and the material of the coating is a nickel-chromium alloy.

4. A sealing device according to claim 1, characterized in that: A first reinforcement component (400) and a second reinforcement component (500) are respectively provided on the top of the installation groove (201), and the first reinforcement component (400) and the second reinforcement component (500) are both used to further seal the gap between the lower pressure cover (300) and the installation groove (201).

5. A sealing device according to claim 4, characterized in that: The first reinforcement component (400) includes an annular cavity provided inside the groove body of the installation groove (201), and a sliding ring (401) slidably arranged on the inner wall of the annular cavity, an annular inflatable airbag (402) is fixedly provided on the inner bottom wall of the annular cavity, and the top of the annular inflatable airbag (402) is fixedly connected to the lower surface of the sliding ring (401).

6. A sealing device according to claim 5, characterized in that: The inner top wall of the annular cavity is provided with six sliding holes in a circumferential array, and the inner wall of the sliding hole is provided with a pressure column (403) for sliding. The bottom end of the pressure column (403) is fixedly connected to the upper surface of the sliding ring (401), and the top ends of the six pressure columns (403) are fixedly provided with a connecting ring (404).

7. A sealing device according to claim 5, characterized in that: The first reinforcement component (400) further comprises an annular mounting groove provided on the upper surface of the mounting groove (201), an inflatable sealing airbag ring (405) being fixedly provided on the inner wall of the annular mounting groove, a first inflation tube (406) extending to the inner wall of the annular cavity being provided on the inner bottom wall of the inflatable sealing airbag ring (405), an annular rubber ring (407) being fixedly provided on the outer ring surface of the sliding ring (401), and six rectangular cavities (408) being provided in a circumferential array inside the sliding ring (401), connecting holes (409) being provided on the surfaces of the rectangular cavities (408) and the annular rubber ring (407), and the connecting holes (409) corresponding to the bottom end of the first inflation tube (406), and a connecting tube (4010) extending to the inside of the rectangular cavity (408) being provided on the inner top wall of the annular inflatable airbag (402).

8. A sealing device according to claim 7, characterized in that: The interiors of the annular inflatable airbag (402) and the expansion sealing airbag ring (405) are each provided with a plurality of first return springs (4011) and second return springs (4012) in a circumferential array. The inner wall of the annular inflatable airbag (402) is provided with an air intake pipe (4013) extending to the outer surface of the mounting groove (201). The surface of the air intake pipe (4013) is provided with an air intake one-way valve (4014).

9. A sealing device according to claim 8, characterized in that: The second reinforcement component (500) includes a plug-in ring (501) fixed on the outer surface of the installation groove (201), and a plug-in groove (502) opened on the lower surface of the lower pressure cover (300) and corresponding to the plug-in ring (501), the plug-in ring (501) is provided with an annular installation cavity inside, the inner wall of the annular installation cavity is fixed with an inner expansion airbag ring (503), the inner ring surface of the inner expansion airbag ring (503) is fixed with a plurality of rectangular plug-in blocks (504) in a circumferential array, the inner ring surface of the plug-in ring (501) is provided with a rectangular hole extending into the inside of the annular installation cavity and slidingly connected to the outer surface of the rectangular plug-in block (504), and the inner wall of the plug-in groove (502) is provided with an annular limiting groove (505) adapted to the plurality of rectangular plug-in blocks (504).

10. A sealing device according to claim 9, characterized in that: The inner wall of the inner expansion airbag ring (503) is provided with a second inflation tube (506) extending to the interior of the expansion sealing airbag ring (405), and the inner wall of the expansion sealing airbag ring (405) is provided with a deflation tube (507) extending to the outer surface of the plug ring (501), and the end of the deflation tube (507) is provided with a sealing plug.

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