Gas tightness detection device for gas valve sealing element

Abstract

The utility model relates to a gas valve sealing element airtightness detection device, which belongs to the technical field of valve airtightness detection devices and comprises a casing, a cover, a high-pressure inflation mechanism and a gas mass spectrum leak detector, a cavity is arranged inside the casing, a plug hole is arranged on the top surface of the casing, and a gas leakage hole is arranged on the bottom surface of the casing; the machine cover covers the machine shell and is provided with an air inflation hole, the machine cover is fixedly provided with an insertion column, the insertion column is inserted into the insertion hole in a matched mode, and the insertion column is provided with a vent hole communicated with the air inflation hole; an air outlet hole of the high-pressure air inflation mechanism is communicated with the air inflation hole; a gas inlet of the gas mass spectrum leak detector is communicated with the gas leakage hole. According to the utility model, the plugging column is adaptively plugged in the plugging hole to seal the contact gap between the machine cover and the machine shell, and then the peripheral side wall of the sealing ring is in sealed contact with the cavity wall of the cavity to simulate the real sealing environment of the sealing ring, so that the gas mass spectrometer leak detector can detect the amount of gas at the gas leakage hole according to the amount of gas detected by the gas mass spectrometer leak detector at the gas leakage hole. Before the gas valve is assembled, the gas tightness of the valve core and the sealing ring is detected.

Description

Technical Field

[0001] The utility model relates to the technical field of valve sealing, in particular to an air tightness detection device for a gas valve sealing member. Background Art

[0002] Valve sealing is a key performance indicator for valves and has a significant impact on their safe operation. Traditional valve sealing testing is typically performed after valve assembly. Failure to pass the test necessitates reassembly, significantly reducing gas valve production efficiency and increasing valve preparation time and material costs.

[0003] Gas valves are a type of valve that are more difficult to manufacture than conventional valves due to the very small atomic radius of gases. Not only do the sealing rings need to possess excellent mechanical properties and gas permeation resistance, but strict requirements are also placed on the surface roughness of the metals in contact with them. The metal surface roughness of the seal at hydrogen valves is generally 0.2-0.3μm. The valve's internal cavity structure is very complex and its dimensions are relatively small, making it costly to achieve such surface roughness. Furthermore, the micromorphology of the same surface roughness varies with different processes, which also has a certain impact on hydrogen sealing.

[0004] Therefore, how to design a gas valve seal leakage detection device with a simple structure, low preparation cost, easy operation and the ability to simultaneously test the influence of the valve sealing ring shape, sealing ring material, metal surface roughness and roughness processing technology on the sealing performance is a problem that technical personnel in this field urgently need to solve. Utility Model Content

[0005] The utility model provides an air tightness detection device for a gas valve sealing member, which solves the technical problem that the air tightness detection of the existing gas valve can only be performed after assembly.

[0006] The utility model solves the above-mentioned technical problems with the following technical solutions: a gas valve seal airtightness detection device, wherein the gas valve seal comprises a valve core and a sealing ring, wherein the outer peripheral side wall of the valve core is provided with an annular sealing groove; the sealing ring is sleeved in the sealing groove; and the device comprises: a housing, a cover, a high-pressure inflation mechanism and a gas mass spectrometer leak detector.

[0007] A cavity is provided inside the casing, a plug-in hole is provided on the top surface of the casing and a leakage hole is provided on the bottom surface thereof, and the plug-in hole and the leakage hole are both connected to the cavity; the valve core is placed in the cavity; the outer peripheral side wall of the sealing ring is in sealing contact with the cavity wall of the cavity; the removable cover of the machine cover is provided at the top end of the casing and is provided with an inflation hole, and a plug-in column is fixed on the bottom surface of the machine cover, and the plug-in column is adapted to be plugged into the plug-in hole to close the contact gap between the machine cover and the casing, and a vent is provided on the plug-in column, and the vent is opposite to and connected to the inflation hole; the outlet hole of the high-pressure inflation mechanism is connected to the inflation hole; the air inlet of the gas mass spectrometer leak detector is connected to the leakage hole to detect the amount of gas leaked from the leakage hole.

[0008] The beneficial effects of the present invention are: changing the traditional detection method that the valve can only be detected after assembly, first placing the valve core and the sealing ring mounted thereon in the cavity of the casing, and then using a gas mechanism to fill the cavity with high-pressure gas through the inflation hole and the vent hole, because the plug-in column is adapted to be plugged into the plug-in hole, the contact gap between the cover and the casing can be closed, and because the outer peripheral side wall of the sealing ring is in sealing contact with the cavity wall of the cavity, the real sealing environment of the sealing ring can be simulated, and the air tightness of the valve core and the sealing ring mounted thereon can be detected before the gas valve is assembled according to the amount of gas detected at the leak hole by a gas mass spectrometer leak detector, thereby avoiding readjustment of the gas valve assembly, reducing its preparation cost, and improving its preparation efficiency.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, it also includes a guide ring, the valve core includes a valve core column and a valve core ring, the sealing groove is arranged on the outer peripheral side wall of the upper end of the valve core column; the valve core ring is fixed on the outer peripheral side wall of the lower end of the valve core column and its outer peripheral side wall is provided with an annular guide groove; the guide ring is arranged in the guide groove and its outer peripheral side wall is in sliding contact with the cavity wall of the cavity.

[0011] The above method has the further beneficial effect of utilizing a guide ring which is sleeved in the guide groove. Since the outer peripheral side wall of the guide ring is in sliding contact with the cavity wall, the valve core and the sealing ring sleeved thereon can be guided and installed in the cavity.

[0012] Furthermore, it also includes a first O-ring and a second O-ring, the top of the housing is provided with a plug-in groove, and the plug-in hole is provided at the bottom of the plug-in groove; the plug-in column includes a first plug-in column and a second plug-in column, the top of the first plug-in column is fixed to the bottom surface of the cover; the top of the second plug-in column is fixed to the bottom end of the first plug-in column and its outer peripheral side wall is provided with an annular groove; the first O-ring is placed at the bottom of the plug-in groove corresponding to the outer peripheral side of the plug-in hole; the first plug-in column is adapted to be inserted into the plug-in groove and pressed on the first O-ring; the second plug-in column is adapted to be inserted into the plug-in hole; the second O-ring is sleeved in the annular groove and its outer peripheral side wall is in sealing contact with the wall of the plug-in hole; the vent is provided on the first plug-in column and the second plug-in column.

[0013] A further beneficial effect of the above-mentioned method is that the first plug-in post is first inserted into the plug-in slot and pressed on the first O-ring, and then the second plug-in post is inserted into the plug-in hole and the second O-ring sleeved on its outer circumference is in sealing contact with the wall of the plug-in hole. A double seal can be set between the machine cover and the housing, thereby improving the sealing between the machine cover and the housing.

[0014] Furthermore, the diameter of the plug-in slot is greater than the diameter of the plug-in hole, and the diameter of the first plug-in column is greater than the diameter of the second plug-in column.

[0015] Furthermore, the high-pressure inflation mechanism includes a gas booster pump, a bottle mouth valve and a gas storage bottle. The gas booster pump, the bottle mouth valve and the gas inlet and outlet of the gas storage bottle are connected in series in sequence through an air pipe, and the gas outlet hole of the gas booster pump is connected to the inflation hole.

[0016] A further beneficial effect of the above method is: open the bottle valve and turn on the booster pump. Since the air outlet of the booster pump is connected to the inflation hole, high-pressure gas can be filled into the cavity through the inflation hole and the vent hole, which is beneficial for the gas mass spectrometer leak detector to detect the amount of gas leaked from the leak hole.

[0017] Furthermore, the high-pressure inflation mechanism also includes a pressure gauge, a pressure relief valve and a high-pressure needle valve, and the pressure gauge, the pressure relief valve and the high-pressure needle valve are installed at intervals on the air pipe between the gas booster pump outlet and the inflation hole.

[0018] Furthermore, the shape of the sealing ring is O-shaped or U-shaped.

[0019] Furthermore, the sealing ring is made of nitrile rubber, fluororubber or polyurethane.

[0020] Furthermore, the valve core is made of plastic material or metal material.

[0021] Furthermore, the roughness of the cavity wall surface is 0.2 to 0.8 μm; the roughness of the sealing groove bottom surface is 0.2 to 0.8 μm.

[0022] The above-mentioned further beneficial effect is that by controlling the surface roughness of the cavity wall and the bottom of the sealing groove, the actual situation of the valve core and the sealing ring installed on it in the valve body can be more realistically simulated, and the influence of the surface roughness on the air tightness of the valve core and the sealing ring can be detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the internal structure of a gas valve seal airtightness detection device of the utility model;

[0024] Figure 2 for Figure 1 A schematic diagram of the local enlarged structure at point A;

[0025] Figure 3 This is a schematic diagram of the internal structure of a casing in a gas valve seal airtightness detection device of the utility model;

[0026] Figure 4 This is a schematic diagram of the internal structure of a cover in a gas valve seal airtightness detection device of the present utility model;

[0027] Figure 5 The utility model is a schematic diagram of the internal structure of the valve core in the gas valve sealing device air tightness detection device.

[0028] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0029] 1. Casing, 11. Cavity, 12. Connecting hole, 13. Leakage hole, 14. Connecting slot, 2. Machine cover, 21. Inflation hole, 3. High-pressure inflation mechanism, 31. Gas booster pump, 32. Bottle valve, 33. Gas cylinder, 34. Pressure gauge, 35. Pressure relief valve, 36. High-pressure needle valve, 4. Gas mass spectrometer leak detector, 5. Valve core, 51. Valve core column, 511. Sealing groove, 52. Valve core ring, 521. Guide groove, 6. Sealing ring, 7. Connecting column, 71. First connecting column, 72. Second connecting column, 721. Annular groove, 73. Vent, 8. Guide ring, 9. First O-ring, 10. Second O-ring. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] like Figure 1 and Figure 2As shown, a gas valve seal air tightness detection device, the gas valve seal includes a valve core 5 and a sealing ring 6, the outer peripheral side wall of the valve core 5 is provided with an annular sealing groove 511; the sealing ring 6 is sleeved in the sealing groove 511; and includes: a housing 1, a cover 2, a high-pressure inflation mechanism 3 and a gas mass spectrometer leak detector 4,

[0032] A cavity 11 is provided inside the casing 1, a plug-in hole 12 is provided on the top surface of the casing 1 and a leakage hole 13 is provided on the bottom surface thereof, and the plug-in hole 12 and the leakage hole 13 are both connected to the cavity 11; the valve core 5 is placed in the cavity 11; the outer peripheral side wall of the sealing ring 6 is in sealing contact with the cavity wall of the cavity 11; the removable cover of the machine cover 2 is provided at the top end of the casing 1 and is provided with an inflation hole 21, and a plug-in column 7 is fixed on the bottom surface of the machine cover 2, and the plug-in column 7 is adapted to be plugged into the plug-in hole 12 to close the contact gap between the machine cover 2 and the casing 1, and a vent 73 is provided on the plug-in column 7, and the vent 73 is opposite to and connected to the inflation hole 21; the air outlet of the high-pressure inflation mechanism 3 is connected to the inflation hole 21; the air inlet of the gas mass spectrometer leak detector 4 is connected to the leakage hole 13 to detect the amount of gas leaked from the leakage hole 13.

[0033] like Figure 2 As shown, in some specific embodiments, a guide ring 8 may also be included, the valve core 5 includes a valve core column 51 and a valve core ring 52, and the sealing groove 511 is provided on the outer peripheral side wall of the upper end of the valve core column 51; the valve core ring 52 is fixed on the outer peripheral side wall of the lower end of the valve core column 51 and its outer peripheral side wall is provided with an annular guide groove 521; the guide ring 8 is arranged in the guide groove 521 and its outer peripheral side wall is in sliding contact with the cavity wall of the cavity 11.

[0034] like Figure 2 As shown, in some specific embodiments, a first O-ring 9 and a second O-ring 10 may also be included, the top of the casing 1 is provided with a plug-in groove 14, and the plug-in hole 12 is provided at the bottom of the plug-in groove 14; the plug-in column 7 includes a first plug-in column 71 and a second plug-in column 72, the top of the first plug-in column 71 is fixed to the bottom surface of the cover 2; the top of the second plug-in column 72 is fixed to the bottom end of the first plug-in column 71 and its outer peripheral side wall is provided with an annular groove 721; the first O-ring 9 is placed at the bottom of the plug-in groove 14 corresponding to the outer peripheral side of the plug-in hole 12; the first plug-in column 71 is adapted to be inserted into the plug-in groove 14 and pressed on the first O-ring 9; the second plug-in column 72 is adapted to be inserted into the plug-in hole 12; the second O-ring 10 is sleeved in the annular groove 721 and its outer peripheral side wall is in sealing contact with the hole wall of the plug-in hole 12; the vent 73 is provided on the first plug-in column 71 and the second plug-in column 72.

[0035] Specifically, the diameter of the plug-in slot 14 is greater than the diameter of the plug-in hole 12 , and the diameter of the first plug-in post 71 is greater than the diameter of the second plug-in post 72 .

[0036] like Figure 1As shown, in some specific embodiments, the high-pressure inflation mechanism 3 may include a gas booster pump 31, a bottle mouth valve 32 and a gas storage bottle 33. The air inlet and air outlet of the gas booster pump 31, the bottle mouth valve 32 and the gas storage bottle 33 are connected in series in sequence through an air pipe, and the air outlet of the gas booster pump 31 is connected to the inflation hole 21.

[0037] like Figure 1 As shown, in some specific embodiments, the high-pressure inflation mechanism 3 may further include a pressure gauge 34, a pressure relief valve 35 and a high-pressure needle valve 36. The pressure gauge 34, the pressure relief valve 35 and the high-pressure needle valve 36 are installed at intervals on the air pipe between the air outlet of the gas booster pump 31 and the inflation hole 21.

[0038] Specifically, the shape of the sealing ring 6 can be O-shaped or U-shaped.

[0039] Specifically, the sealing ring 6 can be made of nitrile rubber, fluororubber or polyurethane.

[0040] Specifically, the valve core 5 can be made of plastic material or metal material.

[0041] Specifically, the roughness of the wall surface of the cavity 11 may be 0.2 to 0.8 μm; the roughness of the bottom surface of the sealing groove 511 may be 0.2 to 0.8 μm.

[0042] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A gas valve seal airtightness detection device, the gas valve seal comprising a valve core (5) and a sealing ring (6), wherein the outer peripheral side wall of the valve core (5) is provided with an annular sealing groove (511); The sealing ring (6) is sleeved in the sealing groove (511); it is characterized in that: include: A housing (1), wherein a cavity (11) is provided inside the housing (1), a plug hole (12) is provided on the top surface of the housing (1) and an air leakage hole (13) is provided on the bottom surface thereof, and both the plug hole (12) and the air leakage hole (13) are in communication with the cavity (11); the valve core (5) is disposed in the cavity (11); and the outer peripheral side wall of the sealing ring (6) is in sealing contact with the cavity wall of the cavity (11); A machine cover (2), wherein the machine cover (2) is detachably mounted on the top of the machine housing (1) and is provided with an air filling hole (21); a plug-in column (7) is fixed to the bottom surface of the machine cover (2); the plug-in column (7) is adapted to be plugged into the plug-in hole (12) to close the contact gap between the machine cover (2) and the machine housing (1); a vent hole (73) is provided on the plug-in column (7); the vent hole (73) is opposite to and communicates with the air filling hole (21); A high-pressure inflation mechanism (3), wherein the air outlet of the high-pressure inflation mechanism (3) is in communication with the inflation hole (21); A gas mass spectrometer leak detector (4), wherein the gas inlet of the gas mass spectrometer leak detector (4) is connected to the leak hole (13) to detect the amount of gas leaked from the leak hole (13).

2. A gas valve seal airtightness detection device according to claim 1, characterized in that: It also includes a guide ring (8), the valve core (5) includes a valve core column (51) and a valve core ring (52), and the sealing groove (511) is provided on the outer peripheral side wall of the upper end of the valve core column (51); The valve core ring (52) is sleeved on the outer peripheral side wall of the lower end of the valve core column (51), and an annular guide groove (521) is provided on the outer peripheral side wall; the guide ring (8) is sleeved in the guide groove (521), and the outer peripheral side wall is in sliding contact with the cavity wall of the cavity (11).

3. The gas valve seal airtightness detection device according to claim 1, characterized in that: The invention also includes a first O-ring (9) and a second O-ring (10), the top of the housing (1) is provided with a plug-in slot (14), and the plug-in hole (12) is provided at the bottom of the plug-in slot (14); the plug-in column (7) includes a first plug-in column (71) and a second plug-in column (72), the top of the first plug-in column (71) is fixed to the bottom surface of the cover (2); the top of the second plug-in column (72) is fixed to the bottom end of the first plug-in column (71) and the outer peripheral side wall thereof is provided with an annular groove (721); the first O-ring (9 ) is placed at the bottom of the plug-in groove (14) corresponding to the outer peripheral side of the plug-in hole (12); the first plug-in column (71) is adapted to be inserted into the plug-in groove (14) and pressed against the first O-ring (9); the second plug-in column (72) is adapted to be inserted into the plug-in hole (12); the second O-ring (10) is sleeved in the annular groove (721) and its outer peripheral side wall is in sealing contact with the hole wall of the plug-in hole (12); the vent hole (73) is provided on the first plug-in column (71) and the second plug-in column (72).

4. A gas valve seal airtightness detection device according to claim 3, characterized in that: The diameter of the plug-in slot (14) is greater than the diameter of the plug-in hole (12), and the diameter of the first plug-in column (71) is greater than the diameter of the second plug-in column (72).

5. The gas valve seal airtightness detection device according to claim 1, characterized in that: The high-pressure inflation mechanism (3) comprises a gas booster pump (31), a bottle mouth valve (32) and a gas storage bottle (33); the gas inlet and gas outlet of the gas booster pump (31), the bottle mouth valve (32) and the gas storage bottle (33) are sequentially connected in series via an air pipe, and the gas outlet of the gas booster pump (31) is connected to the inflation hole (21).

6. The gas valve seal airtightness detection device according to claim 5, characterized in that: The high-pressure inflation mechanism (3) further comprises a pressure gauge (34), a pressure relief valve (35) and a high-pressure needle valve (36); the pressure gauge (34), the pressure relief valve (35) and the high-pressure needle valve (36) are installed at intervals on the air pipe between the air outlet of the gas booster pump (31) and the inflation hole (21).

7. The gas valve seal airtightness detection device according to claim 1, characterized in that: The shape of the sealing ring (6) is O-shaped or U-shaped.

8. The gas valve seal airtightness detection device according to claim 1, characterized in that: The sealing ring (6) is made of nitrile rubber, fluororubber or polyurethane.

9. The gas valve seal airtightness detection device according to claim 1, characterized in that: The valve core (5) is made of plastic material or metal material.

10. The gas valve seal airtightness detection device according to claim 1, characterized in that: The roughness of the cavity wall surface of the cavity (11) is 0.2 to 0.8 μm; the roughness of the bottom surface of the sealing groove (511) is 0.2 to 0.8 μm.

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