Air tightness detection device for spring seal ring

Abstract

The embodiment of the utility model provides an air tightness detection device for a spring sealing ring. The air tightness detection device comprises a blanking cap, a device body, a mounting seat and a sealing ring gland, the device body is a hollow cylinder with the top open, an air inlet connector is arranged in the middle of the blanking cap, and an air outlet connector is arranged in the middle of the bottom face of the device body. The mounting seat and the sealing ring gland are coaxially arranged in the device body, a sealing ring placing cavity for accommodating a to-be-detected spring plug sealing ring is formed among the mounting seat, the sealing ring gland and the inner side surface of the device body, and the sealing ring placing cavity is an annular cavity with a rectangular section; a cushion block protruding downwards is further arranged on the bottom face of the installation base, the outer diameter of the cushion block is smaller than that of the bottom face of the installation base, and the cushion block does not shield the air outlet connector. After the technical scheme is adopted, an indirect method for testing in the prior art is not needed, and independent airtightness testing is carried out on the spring seal ring, so that whether the spring seal ring has the problem of sealing failure or not is 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 tested for leaks. The location of the leak is used to indirectly determine whether the plug seal has a sealing problem.

[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 sealing ring, which is used to directly test the gas tightness of the sealing ring, thereby accurately determining whether the sealing ring has a problem of poor sealing.

[0005] To achieve the above objectives, this utility model provides a gas tightness testing device for a plug seal ring, including a plug, a device body, a mounting base, and a sealing ring cover. The device body is a hollow cylindrical structure with an open top. The plug is detachably connected to the top of the device body, and an air inlet is provided in the middle of the plug. An air outlet is provided in the middle of the bottom surface of the device body. The mounting base and the sealing ring cover are coaxially disposed inside the device body. The sealing ring cover is detachably connected to the mounting base. An annular sealing ring placement cavity for accommodating the plug seal ring to be tested is formed between the mounting base, the sealing ring cover, and the inner wall of the device body. A pad is also provided on the bottom surface of the mounting base. The outer diameter of the pad is smaller than the outer diameter of the bottom surface of the mounting base, and the pad can avoid the location of the air outlet when installed.

[0006] Furthermore, the mounting base includes a connected base and a boss, both of which are circular plate structures, with the outer diameter of the boss being smaller than the outer diameter of the base; the bottom surface of the sealing ring cover is flat, and the outer diameter of the sealing ring cover is larger than the outer diameter of the boss.

[0007] Furthermore, the mounting base also includes a screw rod fixedly connected to the boss, and the sealing ring cover has a screw hole in the middle for engaging with the screw rod.

[0008] Furthermore, a mounting boss is fixedly connected above the sealing ring cover, and the outer contour of the mounting boss is a regular polygon.

[0009] Furthermore, there are multiple spacers; each spacer has a cylindrical structure.

[0010] Furthermore, the device body also includes multiple circumferentially distributed vent holes, the top of which is connected to the sealing ring placement cavity, and the bottom of which is connected to the air outlet.

[0011] Furthermore, an annular first groove is formed on the upper surface of the base; the inner radius of the first groove is greater than the distance from the vent hole to the axis of the base.

[0012] Furthermore, an annular second groove is provided on the inner bottom surface of the device body; the inner radius of the second groove is greater than the distance from the vent hole to the axis of the base.

[0013] Furthermore, the Pan-Sai sealing ring airtightness testing device also includes connecting bolts, a plug with multiple first through holes, and a device body with multiple second through holes on its top surface. The first through holes and the second through holes are positioned correspondingly, and the connecting bolts are used to pass through the first through holes and the second through holes.

[0014] Furthermore, the plug also includes an annular sealing flange that protrudes downward from the lower surface of the plug. An annular third groove is provided on the top surface of the device body, and the sealing flange is used to embed into the third groove. A first sealing ring is also provided between the bottom surface of the third groove and the sealing flange.

[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 uses this device to perform a separate gas tightness test on the sealing ring. The sealing ring is fixed by the sealing ring placement 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, which helps to quickly determine the true 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. Sealing flange; 2. Mounting base; 21. Screw; 22. Boss; 23. Base; 24. Vent hole; 25. First groove; 26. Pad; 3. Sealing ring cover; 4. Device body; 41. Second through hole; 42. Air outlet; 43. Second groove; 44. Third groove; 5. Sealing ring placement cavity; 6. Sealing ring to be tested; 7. Second sealing ring; 8. Third sealing ring; 9. First sealing ring. 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 sealing ring, including a plug 1, a device body 4, a mounting base 2, and a sealing ring cover 3; the device body 4 is a hollow cylindrical structure with an open top, the plug 1 is detachably connected to the top of the device body 4, and the plug 1 is provided with an air inlet 12 in the middle, and an air outlet 42 is provided in the middle of the bottom surface of the device body 4; the mounting base 2 and the sealing ring cover 3 are both coaxially arranged inside the device body 4, and the sealing ring cover 3 is detachably connected to the top of the device body 4. It is connected to the mounting base 2; a sealing ring placement cavity 5 is formed between the mounting base 2, the sealing ring cover 3, and the inner wall of the device body 4 to accommodate the sealing ring 6 to be tested. The sealing ring placement cavity 5 is an annular cavity (in order to better adapt to the shape of the sealing ring, the annular cavity in this application is preferably an annular cavity with a rectangular cross section); the bottom surface of the mounting base 2 is also provided with a downward protruding pad 26. The outer diameter of the pad 26 is smaller than the outer diameter of the bottom surface of the mounting base 2, and the pad 26 does not overlap with the air outlet 42.

[0030] To address the aforementioned problems, this technical solution provides a testing device specifically designed for individually testing the airtightness of a gas seal ring. Its main structure includes... Figure 1 The diagram shows the "outer shell" (composed of the plug 1 and the device body 4) and the internal components (including the mounting base 2 and the sealing ring cover 3) used to fix the plug seal 6 to be tested. The "outer shell" serves to bear pressure and provide a gas input interface (i.e., the inlet port 12) and a gas output interface (i.e., the outlet port 42). The mounting base 2 and the sealing ring cover 3 are used to construct the sealing ring placement cavity 5 to accommodate the plug seal 6 to be tested. When the plug seal 6 to be tested is placed in the sealing ring placement cavity 5, test gas at a predetermined pressure is supplied to the "outer shell" through the inlet port 12. If the plug seal 6 to be tested is properly sealed, its inner and outer walls form a good seal with the inner walls of the mounting base 2 and the device body 4, respectively. At this time, the gas is sealed by the plug seal. When ring 6 is sealed, the gas will not continue to flow downwards, so there will be no gas output from outlet 42. However, when the sealing ring 6 under test has a problem with sealing, the leaked gas will continue to flow downwards (the maximum outer diameter of both the mounting base 2 and the sealing ring cover 3 is smaller than the inner diameter of the device body 4, i.e., a clearance fit is used, so that the gap between the mounting base 2 and the inner wall of the device body 4 forms an airflow channel. When the sealing ring 6 under test does not seal properly, the leaked gas will flow downwards through this airflow channel), and then be output from outlet 42 (see...). Figure 3 , Figure 3The gas flows through a guide hose (which can be connected to the outlet port 42 via a plug-in method) to a downstream leak detection device (e.g., a container filled with water, which can be used to determine whether there is gas output from the guide hose by immersion; or a leak detector, etc.; not shown in the figure). This allows the device to determine whether there is gas output from the outlet port 42, and thus determine whether the sealing ring 6 to be tested has a problem with a poor seal.

[0031] It should be noted that in this technical solution, the size of the sealing ring placement cavity 5 needs 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 all require a dedicated sealing ring airtightness testing device.

[0032] In addition, such as Figure 5 As shown, the bottom surface of the mounting base 2 is also provided with multiple downward protruding pads 26. The function of these pads 26 is to create a certain height gap between the bottom surface of the mounting base 2 and the inner bottom surface of the device body 4, so that the gas leaking from the side can be collected at the gas outlet 42 for output.

[0033] 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 pad 26 is in contact with the inner bottom surface of the device body 4; the bottom surface of the sealing ring cover 3 is flat, and the outer diameter of the sealing ring cover 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 device body 4, and the top surface is in contact with the bottom surface of the sealing ring cover 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 plug seal 6 to be tested should be kept facing upwards. This ensures that the two sidewalls of the plug seal 6 to be tested unfold outwards and press against the outer sidewall of the boss 22 and the inner sidewall of the device body 4, respectively.

[0034] Furthermore, since the mounting base 2 and the sealing ring cover 3 need to be disassembled when placing and removing the sealing ring 6 to be tested, a screw 21 can be provided above the boss 22 for easy disassembly, and a screw hole is provided in the middle of the sealing ring cover 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 sealing ring cover 3, thereby ensuring that the compression of the sealing ring cover 3 of the sealing ring 6 to be tested is accurate and reliable.

[0035] Furthermore, to facilitate the application of force during disassembly, the upper part of the sealing ring cover 3 can be set as a mounting boss, and 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 sealing ring cover 3.

[0036] Furthermore, such as Figure 5 As shown, in order to keep the mounting base 2 horizontal, multiple pads 26 can be provided. The multiple pads 26 are evenly distributed around the axis of the mounting base 2, and each pad 26 is preferably designed as a cylindrical structure.

[0037] Furthermore, the device body 4 also includes multiple circumferentially distributed vent holes 24. The vent holes 24 penetrate the upper and lower surfaces of the base 23, and are located outside the boss 22; that is, their tops communicate with the sealing ring placement cavity 5, and their bottoms communicate with the air outlet 42. The purpose of this design is that in practical applications, there are two types of leakage in the tested plug sealing ring 6: one is internal leakage, where the inner wall of the ring leaks into contact with the outer wall of the boss 22, and the other is external leakage, where the outer wall of the ring leaks into contact with the inner wall of the device body 4. Without the vent holes 24, regardless of whether it is an external or internal leakage, the leaked gas will flow downwards along the gap between the base 23 and the inner wall of the device body 4, and then be output from the air outlet 42. Therefore, it is impossible to distinguish between internal and external leakage. The function of these vent holes 24 is to detect internal leakage in the tested plug sealing ring 6. When internal leakage occurs, such as... Figure 4 As shown, the leaked gas can flow directly downwards along the vent 24. For details of the specific operation process, please refer to the attached instructions for the specific implementation process.

[0038] Furthermore, such as Figure 4 As shown, even with the vent 24, if the sealing ring cap 3 is not tightened sufficiently, 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) may still not be properly sealed. In this case, the gas leaking from the inside and the gas leaking from the outside may converge through the channel at the bottom of the sealing ring 6 to be tested, making it impossible to accurately distinguish whether it is an internal or external leak. To address this, a first annular groove 25 can be formed on the upper surface of the base 23, and the radius of the inner circle of the first groove 25 can be greater than the distance from the vent 24 to the axis of the base 23, i.e., the first groove 25 is positioned further outward than the vent 24. After the second sealing ring 7 is installed in the first groove 25, the channel at the bottom of the sealing ring 6 to be tested is blocked, preventing this channel from interfering with the test results.

[0039] Furthermore, such as Figure 4As shown, in the gap between the bottom surface of the base 23 and the inner bottom surface of the device body 4 (i.e., the gap formed on the side of the pad 26), the airflow from the inner and outer leaks may still converge, thus affecting the judgment of the final result. For this reason, an annular second groove 43 is also opened on the inner bottom surface of the device body 4. The radius of the inner circle of the second groove 43 is greater than the distance from the vent hole 24 to the axis of the base 23, that is, the second groove 43 is located further out than the vent hole 24. At this time, after the third sealing ring 8 is installed in the second groove 43 (the top of the third sealing ring 8 needs to be pressed tightly against the bottom surface of the base 23, so the arrangement of the pad 26 should not affect the third sealing ring 8, that is, the pad 26 should not overlap with the second groove 43), the gas flowing downward between the outer wall of the plug seal 6 to be tested and the inner wall of the device body 4 is blocked. Only the gas flowing downward through the vent hole 24 can pass through. At this time, the inner leak can be detected separately, thereby accurately identifying the fault point of the plug seal 6 to be tested.

[0040] Furthermore, the specific form of the detachable connection between the plug 1 and the device body 4 is as follows: the gas tightness testing device for 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 device 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 to each other, and the connecting bolts are used to pass through the first through holes 11 and the second through holes 41.

[0041] Furthermore, to ensure that no leakage occurs between the plug 1 and the device body 4, such as Figure 6 As shown, the plug 1 also includes an annular sealing flange 13, which protrudes downward from the lower surface of the plug 1. An annular third groove 44 is provided on the top surface of the device body 4, and the sealing flange 13 is used to be embedded in the third groove 44. A first sealing ring 9 is also provided between the bottom surface of the third groove 44 and the sealing flange 13.

[0042] In this technical solution, the second sealing ring 7, the third sealing ring 8, and the first sealing ring 9 can be made of rubber O-rings, or they can be made of rubber or copper gaskets, etc.

[0043] The application method of the aforementioned gas tightness testing device for the sealing ring is as follows:

[0044] 1. Install the second sealing ring 7 in the first 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 sealing ring cover 3 into the screw 21 and adjust the sealing ring cover 3 to lock the sealing ring 6 to be tested.

[0045] 2. Install the third sealing ring 8 in the second groove 43;

[0046] 3. Place the mounting base 2 with the plug seal 6 to be tested installed into the device body 4, so that the side wall of the plug seal 6 to be tested is close to the inner side wall of the device body 4, and the bottom surface of the pad 26 is close to the inner side of the device body 4. During the placement process, avoid damaging the plug seal 6 to be tested.

[0047] 4. Place the first sealing ring 9 in the third groove 44, then adjust the position of the plug 1 so that its sealing flange 13 is embedded in the third groove 44, and align the first through hole 11 with the second through hole 41 one by one. Then fasten the plug 1 to the device body 4 together with the connecting bolts.

[0048] 5. Insert the air intake hose into the air intake port 12, and then introduce air into the air tightness detection device;

[0049] 6. Insert the air outlet hose into the air outlet port 42 and connect it to the downstream leak detection equipment. If the leak detection equipment detects a leak, it proves that the inner edge of the test plug seal ring 6 is damaged. If the leak detection equipment does not detect a leak, it means that the inner edge of the test plug seal ring 6 is not damaged.

[0050] 7. If there is no internal leakage in the test sealing ring 6, it is necessary to check whether there is external leakage. Then, remove the second sealing ring 7 and the third sealing ring 8, reassemble them, and re-test the air supply. If the leak detection equipment does not detect any leakage, it means that the test sealing ring 6 is a qualified product with a good seal. If the leak detection equipment detects a leak, it means that the test sealing ring 6 has external leakage, that is, its outer edge is damaged.

[0051] 8. After the test is completed, remove the gas seal ring 6 to be tested and restore the gas seal ring airtightness testing device.

[0052] Furthermore, if the only requirement is to determine whether the sealing ring 6 to be tested is properly sealed, and there is no need to know whether it is an internal or external leak, then at the beginning of the test, there is no need to install the second sealing ring 7 and the third sealing ring 8, and the test can be carried out directly according to the corresponding steps above.

[0053] 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.

[0054] 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.

[0055] 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 air tightness of a pan seal, characterized in that, It includes a plug (1), a device body (4), a mounting base (2), and a sealing ring cover (3); The device body (4) is a hollow cylindrical structure with an open top. The plug (1) is detachably connected to the top of the device body (4). An air inlet (12) is provided in the middle of the plug (1), and an air outlet (42) is provided in the middle of the bottom surface of the device body (4). The mounting base (2) and the sealing ring cover (3) are coaxially disposed on the inner side of the device body (4). The sealing ring cover (3) is detachably connected to the mounting base (2). An annular sealing ring placement cavity (5) for accommodating the sealing ring (6) to be tested is formed between the mounting base (2), the sealing ring cover (3), and the inner wall of the device body (4). The bottom surface of the mounting base (2) is also provided with a pad (26). The outer diameter of the pad (26) is smaller than the outer diameter of the bottom surface of the mounting base (2), and the pad (26) can avoid the location of the air outlet (42) in the installation state.

2. The pan seal gasket air tightness detection device of claim 1, wherein, 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 plate structures. The outer diameter of the boss (22) is smaller than the outer diameter of the base (23). The bottom surface of the sealing ring cover (3) is a plane, and the outer diameter of the sealing ring cover (3) is larger than the outer diameter of the boss (22).

3. The pan seal gasket air tightness detection device of claim 2, wherein, The mounting base (2) also includes a screw (21) fixedly connected to the boss (22), and the sealing ring cover (3) has a screw hole in the middle for cooperating with the screw.

4. The pan seal gasket air tightness detection device of claim 3, wherein, A mounting boss is also fixedly connected above the sealing ring cover (3), and the outer contour of the mounting boss is a regular polygon.

5. The pan seal gasket air tightness detection device of claim 1, wherein, There are multiple pads (26); each pad (26) has a cylindrical structure.

6. The pan seal gasket air tightness detection device of claim 2, wherein, The device body (4) also includes a plurality of circumferentially distributed vent holes (24), the top of the vent holes (24) being connected to the sealing ring placement cavity (5), and the bottom of the vent holes (24) being connected to the air outlet (42).

7. The pan seal gasket air tightness detection device of claim 6, wherein, The upper surface of the base (23) is also provided with an annular first groove (25); the inner radius of the first groove (25) is greater than the distance from the vent (24) to the axis of the base (23).

8. The pan seal gasket air tightness detection device of claim 7, wherein, The inner bottom surface of the device body (4) is also provided with an annular second groove (43); the inner radius of the second groove (43) is greater than the distance from the vent (24) to the axis of the base (23).

9. The pan seal gasket air tightness detection device of claim 1, wherein, It also includes connecting bolts. The plug (1) has multiple first through holes (11) and the top surface of the device 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 pan seal gasket air tightness detection device of claim 9, wherein, The plug (1) also includes an annular sealing flange (13), which protrudes downward from the lower surface of the plug (1). An annular third groove (44) is provided on the top surface of the device body (4), and the sealing flange (13) is used to be embedded in the third groove (44). A first sealing ring (9) is also provided between the bottom surface of the third groove (44) and the sealing flange (13).

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