Air tightness detection device for spring seal ring

Abstract

The embodiment of the utility model provides an air tightness detection device for a spring seal ring. The air tightness detection device comprises a mounting seat, a gland, and a blanking cap and a body which are connected together, the blanking cap is provided with an air inlet interface; a first air outlet and a second air outlet are formed in the bottom surface of the body; the mounting seat and the gland are arranged on the inner side of the body; the gland is connected to the mounting seat; a sealing ring accommodating cavity for accommodating a to-be-detected spring plug sealing ring is formed among the mounting seat, the gland and the inner side wall of the body; the top of the vent hole is communicated with the sealing ring placing cavity, and the bottom of the vent hole is communicated with the first air outlet; and the second air outlet is communicated with the sealing ring placing cavity. After the technical scheme is adopted, an indirect method for testing in the prior art is not needed, independent airtight testing is carried out on the spring plug sealing ring, inner side leakage and outer side leakage of the spring plug sealing ring can be detected at the same time, and therefore whether sealing failure exists in the spring plug sealing ring or not can be accurately determined.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, and in particular to a gas tightness testing device for a sealing ring. Background Technology

[0002] In valves used in aerospace equipment, plug seals (also known as plug rings or plug seals) are often used as the main sealing components. Because plug seals have an irregular open cross-section, it is difficult to directly test their sealing performance with existing technology. Instead, the entire valve with plug seals assembled is usually subjected to leak testing. The location of the leak is used to indirectly determine whether the plug seal has a problem with sealing.

[0003] In developing this invention, the inventors discovered that the existing technology has at least the following problems: even if leakage occurs at the location of the plug seal ring during overall valve testing, disassembly often reveals no damage to the surface of the plug seal ring. Therefore, it is difficult to determine whether the valve leakage is caused by the plug seal ring, leading to frequent misjudgments and missed judgments, making it difficult to determine the true cause of the valve leakage. Therefore, accurately determining whether the plug seal ring is not sealing properly is a problem that needs to be solved. Utility Model Content

[0004] This utility model provides a gas tightness testing device for a ferrule seal, which is used to directly test the gas tightness of the ferrule seal, thereby accurately determining whether the ferrule seal has a problem of poor sealing.

[0005] To achieve the above objectives, this utility model provides a gas tightness testing device for a PVC seal ring, including a mounting base, a pressure cap, and a plug and a body detachably connected together; the plug is provided with an air inlet; the body is a hollow cylindrical structure with an open top, and the bottom surface of the body is provided with a first air outlet and a second air outlet; the mounting base and the pressure cap are coaxially disposed inside the body, and the pressure cap is detachably connected to the mounting base; a sealing ring placement cavity for accommodating the PVC seal ring to be tested is formed between the mounting base, the pressure cap, and the inner wall of the body, and the sealing ring placement cavity is an annular cavity (in order to better adapt to the shape of the PVC seal ring, the annular cavity in this application is preferably an annular cavity with a rectangular cross section); the mounting base is provided with a vent hole, the top of the vent hole is connected to the sealing ring placement cavity, the bottom of the vent hole is connected to the first air outlet; the second air outlet is connected to the sealing ring placement cavity.

[0006] Furthermore, the mounting base includes a connected base and a boss, both of which are circular, with the outer diameter of the boss being smaller than the outer diameter of the base; the bottom surface of the gland is flat, and the outer diameter of the gland is larger than the outer diameter of the boss; and the vent hole penetrates the upper and lower surfaces of the base.

[0007] Furthermore, the airtightness testing device for the sealing ring also includes a first sealing ring; an annular groove is also provided on the upper surface of the base; the radius of the inner circle of the groove is greater than the maximum distance from the vent hole to the axis of the base; the first sealing ring is located in the groove.

[0008] Furthermore, a pre-set gap is left between the bottom surface of the base and the inner bottom surface of the main body.

[0009] Furthermore, the base is also fixedly connected with a first tenon, which is a ring structure protruding from the bottom surface of the base. The inner radius of the first tenon is greater than the maximum distance between the vent hole and the axis of the base. A ring-shaped first mortise is also provided on the inner bottom surface of the body, and the position and size of the first mortise correspond to the first tenon.

[0010] Furthermore, a second sealing ring is provided inside the first mortise, and the sum of the heights of the first tenon and the second sealing ring is greater than the depth of the first mortise.

[0011] Furthermore, the mounting base also includes a screw fixedly connected to the boss, with the gland screwed onto the screw.

[0012] Furthermore, a mounting boss is fixedly connected to the top of the cover, and the outer contour of the mounting boss is a regular polygon.

[0013] Furthermore, the airtightness testing device for the sealing ring also includes connecting bolts, a plurality of first through holes on the plug, and a plurality of second through holes on the top surface of the body. The number and position of the first and second through holes correspond respectively, and the connecting bolts are used to pass through the first and second through holes.

[0014] Furthermore, the plug also includes an annular second tenon, which protrudes downward from the lower surface of the plug. An annular second mortise is provided on the top surface of the body. The position and size of the second tenon correspond to the second mortise. A third sealing ring is also provided between the bottom surface of the second mortise and the second tenon.

[0015] The above technical solution has the following beneficial effects:

[0016] The gas tightness testing device for the sealing ring in this technical solution has a simple structure and is easy to operate. Unlike existing technologies, it does not require indirect testing methods. Instead, it performs a separate gas tightness test on the sealing ring. The sealing ring is fixed by a cavity formed between the mounting base, the sealing ring cover, and the inner wall of the device body. Then, air is introduced into the closed space formed by the cover and the device body, and the presence or absence of gas outflow is detected through the air outlet. This method accurately determines whether the sealing ring has a sealing failure problem and simultaneously identifies whether the leakage is external or internal. This accurate determination of whether the sealing ring has a sealing failure problem helps to quickly identify the actual cause of leakage in component products (valves, etc.).

[0017] In addition, this technical solution also has the following characteristics:

[0018] Since the airtightness of the Pan-Seal Ring can be tested separately, this technical solution allows for individual testing of the Pan-Seal Ring to be assembled before the module is assembled, thereby avoiding rework due to poor sealing of the Pan-Seal Ring and improving work efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an isometric schematic diagram of the gas tightness testing device for the sealing ring of this utility model embodiment;

[0021] Figure 2 This is a schematic diagram of the structure of the gas tightness detection device for the sealing ring of this utility model embodiment;

[0022] Figure 3 This is a schematic diagram illustrating the application of the gas tightness testing device for the sealing ring of this utility model.

[0023] Figure 4 yes Figure 3 A magnified view of a portion of point I in the middle;

[0024] Figure 5 This is a schematic diagram of the mounting base in an embodiment of the present utility model;

[0025] Figure 6 yes Figure 3 A magnified view of a section at point II;

[0026] Icon labels:

[0027] 1. Plug; 11. First through hole; 12. Air inlet; 13. Second tenon; 2. Mounting base; 21. Screw; 22. Boss; 23. Base; 24. Vent hole; 25. Groove; 26. First tenon; 3. Pressure cap; 4. Body; 41. Second through hole; 42. First air outlet; 43. First tenon groove; 44. Second tenon groove; 45. Second air outlet; 5. Sealing ring placement cavity; 6. Sealing ring to be tested; 7. First sealing ring; 8. Second sealing ring; 9. Third sealing ring; 10. Lateral gap. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figure 1 , Figure 2 As shown, this utility model embodiment provides a gas tightness testing device for a plug seal ring, including a mounting base 2, a pressure cap 3, and a plug 1 and a body 4 connected together in a detachable manner; the plug 1 is provided with an air inlet 12; the body 4 is a hollow cylindrical structure with an open top, and the bottom surface of the body 4 is provided with a first air outlet 42 and a second air outlet 45; the mounting base 2 and the pressure cap 3 are both coaxially arranged inside the body 4, the pressure cap 3 is detachably connected to the mounting base 2, and the maximum outer diameter of the mounting base 2 and the pressure cap 3 is smaller than the inner diameter of the body 4; a sealing ring placement cavity 5 for accommodating the plug seal ring 6 to be tested is formed between the mounting base 2, the pressure cap 3, and the inner sidewall of the body 4, the sealing ring placement cavity 5 is an annular cavity; the mounting base 2 is provided with a vent 24, the top of the vent 24 is connected to the sealing ring placement cavity 5, the bottom of the vent 24 is connected to the first air outlet 42; the second air outlet 45 is connected to the sealing ring placement cavity 5.

[0030] To address the aforementioned problems, this utility model provides a testing device specifically designed for individually testing the airtightness of a gas seal ring, the main structure of which includes... Figure 1 The “outer shell” (consisting of plug 1 and body 4) and the internal components (including mounting base 2 and pressure cap 3) used to fix the test plug seal 6 are shown. The "outer shell" serves to bear pressure and provide gas input interfaces (i.e., inlet 12) and gas output interfaces (i.e., first outlet 42 and second outlet 45). The mounting base 2 and the pressure cap 3 are used to construct the sealing ring placement cavity 5, which accommodates the test plug sealing ring 6. When the test plug sealing ring 6 is placed in the sealing ring placement cavity 5, test gas at a predetermined pressure is supplied to the "outer shell" through the inlet 12. If the test plug sealing ring 6 is properly sealed (the inner and outer walls of the sealing ring are sealing surfaces), its inner and outer walls form a good seal with the mounting base 2 and the inner wall of the body 4, respectively. At this time, the gas is sealed by the test plug sealing ring 6 and will not continue to flow downwards. Therefore, there will be no gas output from the first outlet 42 and the second outlet 45. However, if the test plug sealing ring 6 has a poor seal, the leaked gas will continue to flow downwards and then be output from the first outlet 42 and / or the second outlet 45 (see...). Figure 3(The arrow in the figure indicates the direction of gas flow), and thus the gas is introduced into the downstream leak detection device (such as a leak detector, not shown in the figure) through the guide hose (which can be connected to the first gas outlet 42 and / or the second gas outlet 45 by plugging in), so as to determine whether there is gas output from the two gas outlets, and then determine whether the gas seal ring 6 to be tested has a problem of poor sealing.

[0031] In this embodiment of the present invention, two air outlets are provided because there are two possible situations for the leakage of the sealing ring 6 to be tested: one is internal leakage, that is, its inner wall is damaged, resulting in leakage at the joint between the inner wall and the boss 22; the other is external leakage, that is, its outer wall is damaged, resulting in leakage at the joint between the outer wall and the inner wall of the body 4. If only one air outlet is provided, it is impossible to determine which part is leaking by one test. Therefore, in this technical solution, to improve working efficiency, a first air outlet 42 and a second air outlet 45 (there can be multiple second air outlets 45) are respectively provided. The first air outlet 42 is connected to the bottom of the vent hole 24, and the top of the vent hole 24 is connected to the sealing ring placement cavity 5. The connection position is close to the inner wall of the sealing ring 6 to be tested, so that when there is an internal leakage in the sealing ring 6 to be tested, the leaked gas is discharged through the vent hole 24 and then through the first air outlet 42. The second air outlet 45 is connected to the sealing ring placement cavity 5, and the connection position is close to the outer wall of the sealing ring 6 to be tested. When there is an external leakage in the sealing ring 6 to be tested, the leaked gas is discharged through the lateral gap 10 (i.e., the gap between the outer edge of the mounting base 2 and the inner wall of the body 4) and then through the second air outlet 45. In this way, two gas output paths are formed (see Figure 4 (The arrows in the diagram indicate the direction of gas flow.) When leak detection devices are installed downstream of the gas outlet, both internal and external leaks can be detected simultaneously, thereby improving work efficiency.

[0032] In practical applications, various solutions can be adopted to enable the vent 24 to communicate with the first air outlet 42. For example, the vent 24 can be set to be inclined, with its top opening and bottom opening communicating with the sealing ring placement cavity 5 and the first air outlet 42, respectively. Alternatively, a flange, pad, or other structure can be provided on the bottom surface of the mounting base 2, so that the bottom of the mounting base 2 does not form a face-to-face contact with the inner bottom surface of the body 4, but instead has a cavity for gas to pass through. In this way, the vent 24 can be set vertically, which is easier to process. Similarly, various solutions can be adopted to enable the side gap 10 to communicate with the second air outlet 45. For example, the second air outlet 45 can be opened directly below the side gap 10. Alternatively, a flange, pad, or other structure can be provided on the bottom surface of the mounting base 2, so that a cavity for gas to be contained is formed between the bottom of the mounting base 2 and the inner bottom surface of the body 4, thereby connecting the second air outlet 45 with the side gap 10.

[0033] The dimensions of the sealing ring placement cavity 5 need to be designed to match the sealing ring 6 to be tested, so as to ensure that the compression of the sealing ring 6 in the horizontal and vertical directions meets the corresponding standard requirements, so as to be consistent with the working conditions during actual assembly and application. In addition, different specifications of sealing rings 6 to be tested require a dedicated sealing ring airtightness testing device.

[0034] Furthermore, it should be noted that although the top of the test plug seal ring 6 is pressed tightly by the cover 3, since the top and bottom of the test plug seal ring are not sealing surfaces, there will still be a gap between the top of the test plug seal ring 6 and the cover 3, allowing gas between the cover 3 and the inner wall of the body 4 to enter the inner wall of the test plug seal ring 6 along the top of the test plug seal ring 6.

[0035] Furthermore, as a preferred embodiment, the internal components are specifically implemented as follows: the mounting base 2 includes a base 23 and a boss 22 connected from bottom to top. Both the base 23 and the boss 22 are circular plate structures, and the outer diameter of the boss 22 is smaller than the outer diameter of the base 23. The bottom surface of the pressure cap 3 is flat, and the outer diameter of the pressure cap 3 is larger than the outer diameter of the boss 22. That is, at this time, the inner wall of the sealing ring 6 to be tested is in contact with the outer wall of the boss 22, the outer wall is in contact with the inner wall of the body 4, and the top surface is in contact with the bottom surface of the pressure cap 3, thereby fixing it in three directions and ensuring that the compression in three directions meets the requirements. It should be noted that during placement, since the gas flows from top to bottom, therefore... Figure 3 As shown, the open side of the sealing ring 6 to be tested should be kept facing upwards. This ensures that the two sidewalls of the sealing ring 6 to be tested unfold outwards and press against the outer sidewall of the boss 22 and the inner sidewall of the body 4, respectively. There can be multiple vent holes 24, which are evenly distributed circumferentially and penetrate the upper and lower surfaces of the base 23.

[0036] Furthermore, the airtightness testing device for the sealing ring also includes a first sealing ring 7; an annular groove 25 is also formed on the upper surface of the base 23; the inner radius of the groove 25 is greater than the maximum distance from the vent 24 to the axis of the base 23; the first sealing ring 7 is located within the groove 25. Figure 4As shown, since the bottom of the sealing ring is not a sealing surface, especially when the pressure of the gland 3 is insufficient, there may be a significant gap between the bottom of the sealing ring 6 to be tested and its mounting surface (i.e., the top surface of the step surface of the base 23 protruding outward from the boss 22, i.e., the upper surface of the base 23), forming a gas passage. In this case, the gas leaking from the inside and the gas leaking from the outside may converge through this gas passage, making it impossible to accurately distinguish whether it is an internal or external leak. To address this, an annular groove 25 can be made on the upper surface of the base 23, and the radius of the inner side of the groove 25 can be greater than the distance from the vent 24 to the axis of the base 23. That is, the groove 25 is located further outward than the vent 24, i.e., the groove 25 is located in the middle of the inner and outer walls of the sealing ring 6 to be tested. After the first sealing ring 7 is installed in the groove 25, this passage at the bottom of the sealing ring 6 to be tested is blocked, avoiding interference with the test results.

[0037] Furthermore, as mentioned earlier, various design forms can be used to connect the vent 24 with the first air outlet 42 and the second air outlet 45 with the side gap 10, but the simplest and most reliable method is still as follows: Figure 4 As shown, the bottom surface of the base 23 is raised so that a preset gap is left between the bottom surface of the base 23 and the inner bottom surface of the body 4.

[0038] Furthermore, such as Figure 5 As shown, the base 23 is also fixedly connected to a first tenon 26, which is a ring-shaped structure protruding from the bottom surface of the base 23. The inner radius of the first tenon 26 is greater than the maximum distance between the vent hole 24 and the axis of the base 23. A ring-shaped first mortise 43 is also provided on the inner bottom surface of the body 4, and the position and size of the first mortise 43 correspond to the first tenon 26. Figure 4 As shown, this design allows the bottom of the first tenon 26 to extend into the first mortise 43, thus isolating the inner side of the first tenon 26 (connected to the vent 24 and the first vent 42) from the outer side of the first tenon 26 (connected to the second vent 45 and the side gap 10), forming two unconnected areas. This prevents the leaking gas on the inner side from merging with the leaking gas on the outer side, thus avoiding interference with the test results.

[0039] Furthermore, in order to ensure that the inner and outer sides of the first tenon 26 are effectively separated, a second sealing ring 8 can be installed in the first mortise 43 to ensure the sealing effect; at the same time, in order to leave a gap between the bottom surface of the base 23 and the inner bottom surface of the body 4, the size should be limited so that the sum of the heights of the first tenon 26 and the second sealing ring 8 is greater than the depth of the first mortise 43.

[0040] Furthermore, since the mounting base 2 and the pressure cap 3 need to be disassembled when placing and removing the test plug seal ring 6, a screw 21 can be provided on the boss 22 for easy disassembly, and a screw hole is provided in the middle of the pressure cap 3, so that the two can be threaded together. At the same time, this method also facilitates the fine adjustment of the position of the pressure cap 3, thereby ensuring that the compression of the pressure cap 3 of the test plug seal ring 6 is precisely adjustable.

[0041] Furthermore, to facilitate the application of force during disassembly, a mounting boss can be provided above the cover 3 (or a mounting boss can be directly machined on the top of the cover 3). The outer contour of the mounting boss is a regular polygon (preferably a regular hexagon), so that tools such as hex wrenches can be used to disassemble or adjust the cover 3.

[0042] Furthermore, the specific form of the detachable connection between the plug 1 and the body 4 is as follows: the gas tightness detection device of the sealing ring also includes multiple connecting bolts, the plug 1 is provided with multiple (preferably 6) first through holes 11, and the top surface of the body 4 is provided with multiple second through holes 41. The number and position of the first through holes 11 and the second through holes 41 correspond respectively, and the connecting bolts are used to pass through the first through holes 11 and the second through holes 41.

[0043] Furthermore, to ensure that no leakage occurs between the plug 1 and the body 4, such as Figure 6 As shown, the plug 1 also includes an annular second tenon 13, which protrudes downward from the lower surface of the plug 1. An annular second mortise 44 is provided on the top surface of the body 4. The position and size of the second tenon 13 correspond to the second mortise 44. A third sealing ring 9 is also provided between the bottom surface of the second mortise 44 and the second tenon 13.

[0044] In this technical solution, the first sealing ring 7, the second sealing ring 8, and the third sealing ring 9 can be O-rings made of rubber, or gaskets made of rubber or copper, etc.

[0045] The application method of the aforementioned gas tightness testing device for the sealing ring is as follows:

[0046] 1. Install the first sealing ring 7 in the groove 25, then put the sealing ring 6 to be tested on the outside of the boss 22, and make the bottom surface of the sealing ring 6 to be tested fit tightly on the upper surface of the base 23. Then screw the cover 3 into the screw 21 and adjust the pressure of the cover 3 on the sealing ring 6 to be tested.

[0047] 2. Place the mounting base 2 with the test plug seal ring 6 installed into the body 4 until the first tenon 26 is inserted into the first tenon groove 43 and pressed on the second seal ring 8. During the placement process, avoid damaging the test plug seal ring 6.

[0048] 3. Place the third sealing ring 9 in the second tenon 44, then adjust the position of the plug 1 so that its second tenon 13 is embedded in the second tenon 44, and align the first through hole 11 with the second through hole 41. Then fasten the plug 1 to the body 4 together with the connecting bolts.

[0049] 4. Insert the air intake hose into the air intake port 12, and then introduce air into the air tightness detection device;

[0050] 5. Insert air outlet hoses into both the first air outlet 42 and the second air outlet 45, and connect them to downstream leak detection devices respectively. If the leak detection device connected to the first air outlet 42 detects a leak, it proves that the inner edge of the plug seal ring 6 to be tested is damaged. If the leak detection device connected to the second air outlet 45 detects a leak, it indicates that the outer edge of the plug seal ring 6 to be tested is damaged.

[0051] 6. After the test is completed, remove the gas seal ring 6 to be tested and restore the gas seal ring airtightness testing device.

[0052] In the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features in a single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, with each claim representing a separate preferred embodiment of the invention.

[0053] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use this invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the widest scope of the principles and novel features disclosed in this application.

[0054] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A device for detecting the airtightness of a plug seal ring, characterized in that, Includes a mounting base (2), a pressure cap (3), and a plug (1) and a body (4) that are detachably connected together; The plug (1) is provided with an air inlet (12); the body (4) is a hollow cylindrical structure with an open top, and the bottom surface of the body (4) is provided with a first air outlet (42) and a second air outlet (45). The mounting base (2) and the pressure cap (3) are coaxially arranged inside the body (4). The pressure cap (3) is detachably connected to the mounting base (2). A sealing ring placement cavity (5) for accommodating the sealing ring (6) to be tested is formed between the mounting base (2), the pressure cap (3) and the inner wall of the body (4). The sealing ring placement cavity (5) is an annular cavity. The mounting base (2) is provided with a vent (24), the top of the vent (24) is connected to the sealing ring placement cavity (5), and the bottom of the vent (24) is connected to the first air outlet (42); the second air outlet (45) is connected to the sealing ring placement cavity (5).

2. The gas tightness testing device for the sealing ring as described in claim 1, characterized in that, The mounting base (2) includes a base (23) and a boss (22) connected to each other. Both the base (23) and the boss (22) are circular, and the outer diameter of the boss (22) is smaller than the outer diameter of the base (23). The bottom surface of the pressure cap (3) is flat, and the outer diameter of the pressure cap (3) is larger than the outer diameter of the boss (22). The vent hole (24) penetrates the upper and lower surfaces of the base (23).

3. The gas tightness testing device for the sealing ring as described in claim 2, characterized in that, It also includes a first sealing ring (7); the upper surface of the base (23) is also provided with an annular groove (25); the inner radius of the groove (25) is greater than the maximum distance from the vent hole (24) to the axis of the base (23); the first sealing ring (7) is located in the groove (25).

4. The gas tightness testing device for the sealing ring as described in claim 3, characterized in that, A preset gap is left between the bottom surface of the base (23) and the inner bottom surface of the body (4).

5. The gas tightness testing device for the sealing ring as described in claim 4, characterized in that, The base (23) is also fixedly connected to a first tenon (26), which is an annular structure protruding from the bottom surface of the base (23). The inner radius of the first tenon (26) is greater than the maximum distance between the vent hole (24) and the axis of the base (23). The inner bottom surface of the body (4) is also provided with an annular first mortise (43), the position and size of which correspond to the first tenon (26).

6. The gas tightness testing device for the sealing ring as described in claim 5, characterized in that, A second sealing ring (8) is also provided in the first mortise (43), and the sum of the heights of the first tenon (26) and the second sealing ring (8) is greater than the depth of the first mortise (43).

7. The gas tightness testing device for the sealing ring as described in claim 2, characterized in that, The mounting base (2) also includes a screw (21) fixedly connected to the boss (22), and the pressure cap (3) is screwed onto the screw (21).

8. The gas tightness testing device for the sealing ring as described in claim 7, characterized in that, A mounting boss is also fixedly connected above the cover (3), and the outline of the mounting boss is a regular polygon.

9. The gas tightness testing device for the sealing ring as described in claim 1, characterized in that, It also includes connecting bolts. The plug (1) has multiple first through holes (11) and the top surface of the body (4) has multiple second through holes (41). The number and position of the first through holes (11) and the second through holes (41) are respectively corresponding. The connecting bolts are used to pass through the first through holes (11) and the second through holes (41).

10. The gas tightness testing device for the sealing ring as described in claim 9, characterized in that, The plug (1) also includes an annular second tenon (13), which protrudes downward from the lower surface of the plug (1). An annular second mortise (44) is provided on the top surface of the body (4). The position and size of the second tenon (13) correspond to the second mortise (44). A third sealing ring (9) is also provided between the bottom surface of the second mortise (44) and the second tenon (13).

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