Pipe body valve airtightness testing mechanism

Abstract

The utility model relates to an air tightness testing mechanism for a pipe body valve. The technical problem that the existing airtightness detection efficiency is low is solved. The pipe body valve airtightness testing mechanism comprises a testing jig which is embedded in the testing pipe body, one end of the testing jig abuts against the annular protruding shoulder, at least three positioning columns which are distributed circumferentially are arranged at the end, close to the annular protruding shoulder, of the testing jig, and an installation cavity is formed between the positioning columns. A sealing piece capable of sliding in the axial direction of the installation cavity is arranged on the inner side of the positioning column. The testing device comprises a positioning base and a positioning pressing block; the positioning base is used for positioning and connecting the lower end of the testing pipe body; the positioning pressing block is arranged above the positioning base and can be driven to press and seal the upper end of the testing pipe body. The pipe body valve airtightness test mechanism is simple and convenient to install, improves the detection efficiency, and avoids the problem that the inner wall of the test pipe body is scratched and damaged.

Description

Technical Field

[0001] The utility model belongs to the field of airtightness testing, and relates to an airtightness testing mechanism for a pipe valve. Background Art

[0002] For example, a Chinese patent document discloses an airtightness testing device applicable to a globe valve [201911170244.3], which includes a pneumatic testing component, a testing bench frame with a platen, an installation cylinder, and a fixture that can always fix the installation cylinder on the platen. A first sealing ring and a second sealing ring are clamped between the bottom plate of the installation cylinder and the platen. An air inlet hole one and an air outlet hole one are opened on the platen, and an air inlet hole two and an air outlet hole two are opened on the bottom plate. One end of the air inlet pipe in the pneumatic testing component is connected to an air pump, and the other end is inserted into the air inlet hole one. One end of the exhaust pipe is inserted into a water tank, and the other end is inserted into the air outlet hole one.

[0003] Defects of the above technical solution: The closed structure is complex and the assembly time is long. At the same time, it is not applicable to the situation where the inner cavity closed surface is uneven, and the pipe body is easily scratched and damaged during the assembly and closing process. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an airtightness testing mechanism for a pipe valve in view of the above problems existing in the prior art.

[0005] The purpose of the utility model can be achieved by the following technical solutions:

[0006] The airtightness testing mechanism for a pipe valve, wherein the pipe valve includes a test pipe body with a circumferential shoulder on the inner wall, and a connection hole is provided in the middle of the circumferential shoulder. The airtightness testing mechanism for a pipe valve includes:

[0007] A test pipe body with a circumferential shoulder extending radially inward on the inner wall, and a connection hole is provided in the middle of the circumferential shoulder;

[0008] A test fixture is embedded in the test pipe body, and one end of the test fixture abuts against the circumferential shoulder. At least three circumferentially distributed positioning posts are provided at one end of the test fixture close to the circumferential shoulder, and an installation cavity is formed between the positioning posts. A closing piece capable of sliding axially along the installation cavity is provided inside the positioning posts, and the closing piece is used to close the connection hole;

[0009] A test device includes a positioning base for positioning and connecting the lower end of the test pipe body, a positioning press block arranged above the positioning base and capable of driving and pressing down to close the upper end of the test pipe body. The positioning press block is connected with an air pump and an air inlet hole communicating with the inside of the test pipe body is provided in the positioning press block.

[0010] Further, the circumferential shoulder has a flanging portion extending axially at the circumferential edge of the connection hole.

[0011] Further, the outer wall of the test fixture fits against the inner wall of the test tube, and the test fixture is provided with an axially penetrating relief hole.

[0012] Further, the outer wall of the positioning post is in contact with the inner wall of the test tube.

[0013] Further, the outer wall of the positioning post is provided with an arc surface.

[0014] Further, a stepped surface is provided inside the positioning post, and the closing piece is lapped on the stepped surface and kept at a distance from the test fixture.

[0015] Further, an enlarged hole arc surface is provided at the end of the test fixture close to the positioning post and at the circumferential edge of the connection hole.

[0016] Further, one end of the positioning pressing block is provided with a concave positioning blind hole, and a sealing gasket is embedded in the positioning blind hole.

[0017] Further, a positioning notch for the positioning post to be inserted into is provided on the outer wall of the closing piece.

[0018] Further, an air outlet communicating with the inside of the test tube is provided in the middle of the positioning base, and the air outlet is connected with a gas flow meter.

[0019] Compared with the prior art, the airtightness testing mechanism of the tube valve realizes the rapid preliminary closing of the connection hole in the test tube through the test fixture, is easy to install and improves the detection efficiency. It cooperates with the constant-pressure gas of the testing device to achieve a stable fitting and closing effect, and realizes the accurate axial introduction of the test fixture, reduces the contact area between the positioning post and the inner wall of the test tube, reduces the frictional resistance, and avoids the problem of scratching and damage to the inner wall of the test tube caused by deviation during the installation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a schematic diagram of an airtightness testing mechanism of a tube valve provided by the present utility model.

[0021] Figure 2 is Figure 1 axial sectional view of the test fixture of the airtightness testing mechanism of the tube valve.

[0022] Figure 3 is Figure 1 radial sectional view of the test fixture of the airtightness testing mechanism of the tube valve Figure 1 .

[0023] Figure 4 is Figure 1 radial sectional view of the test fixture of the airtightness testing mechanism of the tube valve Figure 2 .

[0024] In the figure, 10 is a test tube body; 11 is an annular shoulder; 12 is a connection hole; 13 is a flanging part; 20 is a test fixture; 21 is a positioning post; 22 is an installation cavity; 23 is a sealing piece; 24 is a relief hole; 25 is an arc surface; 26 is a step surface; 27 is a reamed arc surface; 28 is a positioning notch; 30 is a test device; 31 is a positioning base; 32 is a positioning pressing block; 33 is a pump air machine; 34 is an air inlet hole; 35 is a positioning blind hole; 36 is a gasket; 37 is an air outlet hole; 38 is a gas flow meter. Specific implementation manner

[0025] Please refer to Figures 1 to 3 , which is a schematic diagram of a tube valve airtightness test mechanism provided by the present utility model. The tube valve airtightness test mechanism includes: a test fixture 20 installed in the test tube body 10, and a test device 30 for fixing and closing both ends of the test tube body 10. It can be imagined that this tube valve airtightness test mechanism also includes other functional components and specific structures, such as electrical connection components, sealing structures, installation structures, etc., which are all well-known technologies to those skilled in the art, so they will not be elaborated in detail one by one here.

[0026] In this embodiment, the test tube body 10 is a tubular structure made of metal or alloy material. The two ends of the test tube body 10 are respectively an open end and a narrow end. The inner diameter of the open end of the test tube body 10 is of a consistent structure along the axial direction. An annular shoulder 11 extending radially inward is welded to the inner wall of the middle part of the test tube body 10, and a connection hole 12 communicating both sides of the annular shoulder 11 is provided in the middle of the annular shoulder 11. It can be imagined that the test tube body 10 is not limited to a tubular structure made of metal or alloy, and the annular shoulder 11 and the inner wall of the test tube body 10 can also be formed by integral injection molding. When testing the airtightness, it is necessary to close the connection hole 12 of the annular shoulder 11. After the test device 30 injects constant-pressure gas into the test tube body 10, the purpose of testing the airtightness of the inner wall of the test tube body 10 and the connection surface between the test tube body 10 and the annular shoulder 11 can be achieved.

[0027] The surface of the annular shoulder 11 is in a relatively flat state. In this embodiment, the annular shoulder 11 has a flanging part 13 extending axially at the circumferential edge of the connection hole 12, so that the circumferential edge of the connection hole 12 is axially convex and the thickness of the flanging part 13 is relatively thin. Conventional sealing methods are likely to result in poor sealing at the position of the connection hole 12 and the flanging part 13 is easily deformed by force.

[0028] In this embodiment, the test fixture 20 has an annular main body, providing an integral and reliable structural strength. At one end of the test fixture 20 close to the annular shoulder 11, there are at least three circumferentially distributed positioning posts 21. The positioning posts 21 can reduce the contact area of the annular shoulder 11 and do not affect the airtightness test structure after the constant-pressure gas is introduced. An installation cavity 22 is formed between the positioning posts 21. Inside the positioning posts 21, there is a closing piece 23 that can slide axially along the installation cavity 22. The installation cavity 22 is used to stabilize the axial movement state of the closing piece 23, preventing the closing piece 23 from detaching from the installation piece or even radially moving and touching the inner wall of the test tube body 10. The outer diameter of the closing piece 23 is larger than the outer diameter of the connection hole 12, and the closing piece 23 is used to seal the connection hole 12.

[0029] Before the airtightness test, the test fixture 20 is pre-installed in the test tube body 10. The test fixture 20 is inserted from the open end of the test tube body 10 and one end of the test fixture 20 abuts against the annular shoulder 11. The closing piece 23 moves axially along the installation cavity 22 and correspondingly seals the connection hole 12, forming a preliminary seal of the connection hole 12. It can be imagined that when the closing piece 23 directly acts on the flat end face of the annular shoulder 11, the constant-pressure gas provided by the test device 30 acts on the closing piece 23 to force the closing piece 23 to stably fit the connection hole 12; when sealing the connection hole 12 of the annular shoulder 11 with a flanging portion 13, a closing piece 23 structure with elastic deformation ability or a soft pad structure can be provided on one side of the closing piece 23 to ensure the elastic contact between the closing piece 23 and the flanging portion 13 and the elastic sealing effect of the connection hole 12.

[0030] More optimally, to ensure the stable installation of the test fixture 20 into the test tube body 10, the outer wall of the test fixture 20 fits with the inner wall of the test tube body 10. The test tube body 10 provides a guiding function for the axial insertion and installation of the test fixture 20, ensuring the accuracy of the closing piece 23 corresponding to the sealing of the connection hole 12. Moreover, the test fixture 20 is provided with an axially penetrating relief hole 24. The relief hole 24 ensures the passage of the constant-pressure gas. Cooperating with the hollow groove between the positioning posts 21, the test surface is still largely exposed, reducing the influence of the installation of the test fixture 20 in the test tube body 10 on the airtightness test. At one end of the test fixture 20 close to the positioning posts 21 and on the circumferential edge of the connection hole 12, there is a reaming arc surface 27. The reaming arc surface 27 is beneficial for the diversion of the constant-pressure gas and can directly act axially on the closing piece 23, enabling the closing piece 23 to quickly seal the connection hole 12.

[0031] There is a stepped surface 26 inside the positioning post 21. The closing piece 23 overlaps on the stepped surface 26 and maintains a spacing from the test fixture 20. The stepped surface 26 reduces the contact area between the closing piece 23 and the positioning post 21, and at the same time prevents the closing piece 23 from jamming materials in the test fixture 20. The test fixture 20 is used to quickly and preliminarily seal the connection hole 12 inside the test tube body 10, and cooperate with the constant-pressure gas of the test device 30 to achieve a stable fitting and sealing effect.

[0032] In other embodiments, the outer wall of the positioning post 21 can also be in contact with the inner wall of the test tube body 10 to form an accurate axial guiding effect of the test fixture 20. The outer wall of the positioning post 21 is provided with an arc surface 25, and the arc surface 25 reduces the contact area between the positioning post 21 and the inner wall of the test tube body 10, reduces the frictional resistance, and avoids the problem of scratching and damage to the inner wall of the test tube body 10 during the installation process.

[0033] Please refer to Figure 4 , in order to limit the influence of the rotation of the closing piece 23 in the installation cavity 22 on the surface of the annular shoulder 11 or the flanging portion 13, the outer wall of the closing piece 23 is provided with a positioning notch 28 for the positioning post 21 to be inserted into, so that the closing piece 23 can only maintain an axial movement mode, avoiding the closing piece 23 rotating and scratching the annular shoulder 11 or the flanging portion 13.

[0034] Please refer to Figure 1 , the test device 30 includes a positioning base 31 for the lower end of the test tube body 10 to be positioned and connected. The positioning base 31 is installed on the equipment platform. The narrow end of the test tube body 10 is correspondingly abutted against the positioning base 31, and the positioning base 31 seals the port of the narrow end of the test tube body 10.

[0035] Above the positioning base 31, there is a positioning press block 32. The positioning press block 32 is connected with a cylinder, and is driven to move vertically by the cylinder and can drive down to seal the open end of the test tube body 10. One end of the positioning press block 32 is provided with a concave positioning blind hole 35, and the inner diameter of the positioning blind hole 35 is smaller than the outer diameter of the test tube body 10. The positioning blind hole 35 increases the guiding effect of the open end of the test tube body 10. A sealing gasket 36 is installed in the positioning blind hole 35. The soft contact between the sealing gasket 36 and the test tube body 10 can prevent the test tube body 10 from being deformed by force and improve the sealing performance of the open end of the test tube body 10.

[0036] The positioning block 32 is connected to a pump-air machine 33 and is provided with an air inlet hole 34 communicating with the inside of the test tube body 10. The pump-air machine 33 provides constant-pressure gas and can monitor the air pressure in the communicating pipeline. The constant-pressure gas output by the pump-air machine 33 enters the test tube body 10 through the air inlet hole 34. The closing piece 23 closes the connecting hole 12 under the action of the constant-pressure gas, forming a sealed cavity at the open end of the test tube body 10. After the constant-pressure gas fills the sealed cavity, the pump-air machine 33 monitors that a stable pressure-holding state is formed at the open end of the test tube body 10, which means the airtightness is qualified. If the pump-air machine 33 monitors that the air pressure is unstable at the open end of the test tube body 10, it means the airtightness is unqualified.

[0037] It can be imagined that in order to avoid forming a false pressure-holding state, that is, a slight leakage state, at the open end of the test tube body 10, an air outlet hole 37 communicating with the inside of the test tube body 10 is provided in the middle of the positioning base 31. The air outlet hole 37 is connected to a gas flowmeter 38. The gas leaked from the open end of the test tube body 10 is received through the air outlet hole 37, the air leakage is synchronously detected, and the clear display of the gas leakage is realized through the gas flowmeter 38.

[0038] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A pipe valve air tightness testing mechanism, the pipe valve comprising a test pipe body (10) with an annular convex shoulder (11) on the inner wall, a connecting hole (12) being provided in the middle of the annular convex shoulder (11), characterized in that: The pipe body valve air tightness testing mechanism comprises: A test fixture (20) is embedded in the test tube body (10) and one end of the test fixture (20) abuts against the annular boss (11); at least three circumferentially distributed positioning columns (21) are provided at one end of the test fixture (20) close to the annular boss (11), and a mounting cavity (22) is formed between the positioning columns (21); a closing plate (23) capable of axially sliding along the mounting cavity (22) is provided on the inner side of the positioning column (21); the closing plate (23) is used to close the connecting hole (12); The testing device (30) comprises a positioning base (31) for positioning and connecting the lower end of the testing tube body (10), a positioning pressing block (32) arranged above the positioning base (31) and capable of being driven to press down and seal the upper end of the testing tube body (10), the positioning pressing block (32) being connected to an air pump (33) and having an air inlet (34) in the positioning pressing block (32) communicating with the interior of the testing tube body (10).

2. The air tightness testing mechanism for pipe valves according to claim 1, characterized in that: The annular shoulder (11) is located at the circumferential edge of the connecting hole (12) and has an axially extending flange portion (13).

3. The air tightness testing mechanism for pipe valves according to claim 2, characterized in that: The outer wall of the test fixture (20) is in contact with the inner wall of the test tube body (10), and the test fixture (20) is provided with an axially penetrating clearance hole (24).

4. The pipe body valve air tightness testing mechanism according to claim 2 or 3, characterized in that: The outer wall of the positioning column (21) is connected to the inner wall of the test tube body (10).

5. The air tightness testing mechanism for pipe valves according to claim 4, characterized in that: The outer wall of the positioning column (21) is provided with an arc surface (25).

6. The air tightness testing mechanism for pipe valves according to claim 4, characterized in that: A step surface (26) is provided on the inner side of the positioning column (21), and the closing piece (23) overlaps the step surface (26) and maintains a distance from the test fixture (20).

7. The air tightness testing mechanism for pipe valves according to claim 6, characterized in that: The test fixture (20) is provided with a hole expansion arc surface (27) at one end close to the positioning column (21) and located at the circumferential edge of the connecting hole (12).

8. The air tightness testing mechanism for pipe valves according to claim 6, characterized in that: One end of the positioning pressing block (32) is provided with an inwardly concave positioning blind hole (35), and a sealing gasket (36) is embedded in the positioning blind hole (35).

9. The air tightness testing mechanism for pipe valves according to claim 6, characterized in that: The outer wall of the closing piece (23) is provided with a positioning notch (28) for the positioning column (21) to be inserted into.

10. The pipe valve air tightness testing mechanism according to claim 1, characterized in that: A gas outlet hole (37) communicating with the interior of the test tube body (10) is provided in the middle of the positioning base (31), and the gas outlet hole (37) is connected to a gas flow meter (38).

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