Leakage detection system of valve

Abstract

The utility model provides a leak detection system of a valve, and aims to solve the technical problems of complex detection program and low detection efficiency in the detection of the air tightness of a low-temperature pneumatic stop valve at present. The leak detection system comprises a pipe body which is of a hollow structure; the connecting flange is arranged at one end of the pipe body, and a through hole equal to the pipe body in size is formed in the middle of the connecting flange; the sealing plate is arranged at the other end of the pipe body, and a channel penetrating through the two sides of the sealing plate is formed in the sealing plate; one end of the connecting pipe is arranged on the channel of the sealing plate; a leak detection opening of the vacuum pump is detachably connected with one end, far away from the pipe body, of the connecting pipe; the helium mass spectrometer is communicated with the vacuum pump through a pipeline; the helium spray gun is provided with a nozzle. According to the leak detection system, the interior of the valve body is vacuumized through the connecting pipe, rapid detection of the valve body is achieved, when the valve element of the low-temperature pneumatic stop valve is detected, the valve element penetrates into the pipe body, the connecting flange is connected to the valve element, and therefore rapid detection of the valve element is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of valve body quality inspection, specifically to a valve leak detection system. Background Technology

[0002] A cryogenic pneumatic shut-off valve is a shut-off valve that operates in a low-temperature environment and is driven to open and close by air pressure. Due to the harsh working environment of this cryogenic pneumatic shut-off valve, its production requirements are relatively high, such as the requirement for airtightness.

[0003] Currently, after the production of cryogenic pneumatic shut-off valves is completed, there is no systematic testing method for their airtightness. During testing, it is necessary to find equipment such as flanges and vacuum pumps on-site and assemble a simple testing fixture, which leads to complicated testing procedures and low testing efficiency. Utility Model Content

[0004] To address the technical problems of complex testing procedures and low testing efficiency in current methods for testing the airtightness of cryogenic pneumatic shut-off valves, this invention provides a valve leak detection system. By connecting a corresponding flange to the valve body of the cryogenic pneumatic shut-off valve and then evacuating the valve body through a connecting pipe, rapid testing of the valve body is achieved. When testing the valve core of the cryogenic pneumatic shut-off valve, the valve core is inserted into the pipe body, and the connecting flange is connected to the valve core, thereby achieving rapid testing of the valve core.

[0005] The technical solution of this utility model is:

[0006] A valve leak detection system, comprising:

[0007] The tube body has a hollow internal structure.

[0008] A connecting flange is provided at one end of the pipe body, and the connecting flange has a through hole in the middle with the same size as the pipe body;

[0009] A sealing plate is provided at the other end of the tube body, and the sealing plate has a channel running through both sides of it;

[0010] A connecting pipe, one end of which is located on the channel of the sealing plate;

[0011] A vacuum pump, wherein the leak detection port is detachably connected to the end of the connecting pipe away from the pipe body;

[0012] A helium mass spectrometer is connected to the vacuum pump via a pipeline;

[0013] A helium spray gun, which has a single nozzle.

[0014] Optionally, the connecting pipe is provided with a vacuum flange.

[0015] Optionally, the connecting flange has an annular groove on the side away from the pipe body, and a sealing gasket is provided in the annular groove.

[0016] Optionally, one end of the connecting tube is inserted into the channel of the sealing plate, and an outwardly expanding sealing area is provided on the end of the channel away from the tube body, and a PTFE gasket is provided in the sealing area.

[0017] Optionally, the channel on the sealing plate is a threaded hole, one end of the connecting tube has external threads that can match the threads in the channel, and the middle part of the connecting tube has a hexagonal prism structure.

[0018] Optionally, the outer dimensions of the sealing plate are equal to the outer dimensions of the tube body, one end of the sealing plate has a protruding structure, the size of which is equal to the inner dimensions of the tube body, and this end of the sealing plate is inserted into the tube body.

[0019] Optionally, the inner dimension of the through hole on the connecting flange is equal to the outer dimension of the pipe body, and one end of the pipe body is inserted into the through hole of the connecting flange.

[0020] Optionally, the sealing plate and the connecting pipe are welded together, and the pipe body and the connecting flange are also welded together.

[0021] Optionally, the system also includes a crimp flange having multiple crimp holes, and a connecting flange having multiple connecting holes, with each connecting hole corresponding to one of the crimp holes.

[0022] Optionally, the through-hole size in the middle of the crimp flange is larger than the through-hole size in the middle of the connecting flange.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] A connecting flange is installed at one end of the tube for connecting to the valve body and valve core of the cryogenic pneumatic shut-off valve. Then, the connecting pipe at the other end of the tube is connected to the leak detection port of the helium mass spectrometer leak detector. A vacuum pump is then used to evacuate the valve body until the internal vacuum level reaches a predetermined value. Helium gas is then sprayed onto the weld joint of the valve body using a helium spray gun. If the vacuum level on the helium mass spectrometer leak detector increases, it indicates that the weld joint of the valve body is not up to standard. If the vacuum level does not change, it proves that the weld joint is qualified. Similarly, the valve core can be tested.

[0025] This technical solution allows for rapid and efficient testing of cryogenic pneumatic shut-off valves. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of this utility model;

[0028] Figure 2 This is a schematic diagram of the detection valve body of this utility model;

[0029] Figure 3 This is a schematic diagram of a press-fit flange structure;

[0030] Figure 4 This is a schematic diagram of the detection valve core of this utility model;

[0031] Figure 5 This is a schematic diagram of the detection system of this utility model. Detailed Implementation

[0032] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0033] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0034] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Example

[0035] See Figure 1 , Figure 2 , Figure 4 and Figure 5This embodiment discloses a valve leak detection system, including a pipe body 10, a connecting flange 20, a sealing plate 30, a connecting pipe 40, a vacuum pump 50, a helium gas spectrometer 60, and a helium spray gun (not shown in the figure).

[0036] The tube body 10 is a hollow cylindrical structure. One end of the tube body 10 is connected to the connecting flange 20, which is circular and has a through hole 21 in the middle. The end of the tube body 10 is connected to the through hole 21. The connecting flange 20 has multiple connecting holes 22, all of which are arranged around the circumference of the through hole 21.

[0037] The sealing plate 30 is disposed on the other end of the tube body 10, and the sealing plate 30 has a channel 31 that runs through both sides of it. A connecting pipe 40 is disposed on the side of the sealing plate 30 away from the tube body 10. The connecting pipe 40 is also hollow inside. The connecting pipe 40 is disposed at the channel 31, so that the interior of the tube body 10 and the interior of the connecting pipe 40 are connected through the channel 31.

[0038] The end of the connecting pipe 40 furthest from the sealing plate 30 is connected to the leak detection port of the vacuum pump 50, which evacuates the inside of the tube 10. Simultaneously, the vacuum pump 50 is also connected to a helium gas spectrometer 60 via a pipe, allowing the vacuum level to be detected by the helium gas spectrometer 60.

[0039] The system also includes a helium spray gun, which sprays high-pressure helium gas through its nozzle.

[0040] During valve leak detection, the valve body 71 and valve core 72 of the cryogenic pneumatic shut-off valve are connected via the connecting flange 20. Then, the valve body 10 is connected to the leak detection port of the helium mass spectrometer leak detector via the connecting pipe 40 at one end. The valve body 71 is then evacuated by the vacuum pump 50 until the vacuum level reaches a predetermined value. Helium gas is then sprayed onto the weld joint of the valve body 71 using a helium spray gun. If the vacuum level on the helium mass spectrometer leak detector increases, it indicates that the weld joint of the valve body 71 is not up to standard. If the vacuum level does not change, it proves that the weld joint is up to standard. Similarly, the valve core 72 can be tested.

[0041] This technical solution allows for rapid and efficient testing of cryogenic pneumatic shut-off valves.

[0042] In one specific embodiment:

[0043] A vacuum flange 80 is provided on the outside of the connecting pipe 40, and the vacuum flange 80 is connected to the leak detection port of the vacuum pump 50.

[0044] In another specific embodiment:

[0045] An annular groove 23 is provided on the side of the connecting flange 20 away from the pipe body 10, and a sealing gasket 24 is provided in the annular groove 23. When the connecting flange 20 is connected to the valve body 71 or the valve core 72, the sealing gasket 24 is pressed between the connecting flange 20 and the valve body 71 or the valve core 72, thereby forming a sealing structure at the connection.

[0046] In another specific embodiment:

[0047] One end of the connecting pipe 40 is inserted into the channel 31 of the sealing plate 30, and an outwardly expanding sealing area 32 is provided at the end of the channel 31 away from the pipe body 10. The sealing area 32 has a concave annular structure at the end of the sealing plate 30, and a PTFE gasket 33 is provided in the sealing area 32. By providing the sealing area 32 and the PTFE gasket 33, the sealing effect between the connecting pipe 40 and the sealing plate 30 can be enhanced.

[0048] In another specific embodiment:

[0049] The channel 31 on the sealing plate 30 is a threaded hole. One end of the connecting tube 40 has external threads that can match the threads inside the channel 31. The middle part of the connecting tube 40 is provided with a hexagonal prism 41 structure. The design of this hexagonal prism 41 structure allows the connecting tube 40 to be turned by tools such as wrenches. Furthermore, the hexagonal prism 41 structure can also press the aforementioned PTFE gasket 33 firmly onto the sealing plate 30, thereby forming a sealing structure between the connecting tube 40 and the sealing plate 30.

[0050] In another specific embodiment:

[0051] The outer dimensions of the sealing plate 30 are equal to the outer dimensions of the tube body 10, so that the entire exterior of the tube body 10 and the exterior of the sealing plate 30 are on the same surface, without creating protrusions or other structures, thus maintaining a consistent appearance.

[0052] One end of the sealing plate 30 has a protrusion structure 34. The outer dimension of the protrusion structure 34 is equal to the inner dimension of the tube body 10, and this end of the sealing plate 30 is inserted into the tube body 10. By designing the protrusion structure 34, the contact area between the connecting tube 40 and the sealing plate 30 can be increased, thereby improving the connection strength between the connecting tube 40 and the sealing plate 30.

[0053] The inner dimension of the through hole 21 on the connecting flange 20 is equal to the outer dimension of the pipe body 10, so that one end of the pipe body 10 is inserted into the through hole 21 of the connecting flange 20. This design is also to increase the contact area between the pipe body 10 and the connecting flange 20 and improve the connection strength between the pipe body 10 and the connecting flange 20.

[0054] In another specific embodiment:

[0055] The sealing plate 30 and the connecting pipe 40 are welded together, as are the pipe body 10 and the connecting flange 20. This embodiment discloses a specific connection method between the sealing plate 30 and the connecting pipe 40, and between the pipe body 10 and the connecting flange 20. However, this does not mean that this is the only possible connection method.

[0056] In another specific embodiment:

[0057] See Figure 3 and Figure 4 The system also includes a crimp flange 90 with multiple crimp holes 91, and a connecting flange 20 with multiple connecting holes 22, with each connecting hole 22 corresponding to one of the crimp holes 91. In this embodiment, a crimp flange 90 is designed. When performing a leak test on the valve core 72, the crimp flange 90 is inserted through one end of the valve core 72, and then the connecting holes 22 and crimp holes 91 are connected in series and locked with bolts, thereby fixing the connecting flange 20 and the pipe body 10.

[0058] Preferably, the size of the through hole 92 in the middle of the crimp flange 90 is larger than the size of the through hole 21 in the middle of the connecting flange 20, so that the crimp flange 90 can be inserted into the valve core 72.

[0059] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A leak detection system for a valve, characterized in that, include: The tube body has a hollow internal structure. A connecting flange is provided at one end of the pipe body, and the connecting flange has a through hole in the middle with the same size as the pipe body; A sealing plate is provided at the other end of the tube body, and the sealing plate has a channel running through both sides of it; A connecting pipe, one end of which is located on the channel of the sealing plate; A vacuum pump, wherein the leak detection port is detachably connected to the end of the connecting pipe away from the pipe body; A helium mass spectrometer is connected to the vacuum pump via a pipeline; A helium spray gun, which has a single nozzle.

2. The valve leak detection system according to claim 1, characterized in that, The connecting pipe is equipped with a vacuum flange.

3. The valve leak detection system according to claim 1, characterized in that, The connecting flange has an annular groove on the side away from the pipe body, and a sealing gasket is provided in the annular groove.

4. The valve leak detection system according to claim 1, characterized in that, One end of the connecting tube is inserted into the channel of the sealing plate, and an outwardly expanding sealing area is provided on the end of the channel away from the tube body, and a PTFE gasket is provided in the sealing area.

5. The valve leak detection system according to claim 1, characterized in that, The channel on the sealing plate is a threaded hole, one end of the connecting tube has external threads that can match the threads in the channel, and the middle part of the connecting tube has a hexagonal prism structure.

6. The valve leak detection system according to claim 1, characterized in that, The outer dimensions of the sealing plate are equal to the outer dimensions of the tube body. One end of the sealing plate has a protruding structure, the size of which is equal to the inner dimensions of the tube body, and this end of the sealing plate is inserted into the tube body.

7. The valve leak detection system according to claim 1, characterized in that, The inner dimension of the through hole on the connecting flange is equal to the outer dimension of the pipe body, and one end of the pipe body is inserted into the through hole of the connecting flange.

8. The leak detection system for valves according to any one of claims 1-7, characterized in that, The sealing plate is welded to the connecting pipe, and the pipe body is also welded to the connecting flange.

9. The valve leak detection system according to claim 1, characterized in that, It also includes a crimp flange having multiple crimp holes, and a connecting flange having multiple connecting holes, with each connecting hole corresponding to one of the crimp holes.

10. The valve leak detection system according to claim 9, characterized in that, The through-hole size in the middle of the crimp flange is larger than the through-hole size in the middle of the connecting flange.

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