Valve rod assembly sealing performance testing device taking helium as testing medium

Abstract

The invention belongs to the technical field of valve testing, and particularly relates to a valve rod assembly sealing performance testing device with helium as a testing medium. The valve rod assembly sealing performance testing device taking helium as the testing medium comprises a bottom plate, a helium leakage detection connector and a connecting pipe, the connecting pipe is a cylindrical part made of rigid materials and is arranged on the bottom plate, the helium leakage detection connector communicated with the outside is arranged on the side wall of the connecting pipe, and a valve rod assembly needing to be tested is arranged at the top end of the connecting pipe. The invention has the advantages that: the bottom plate and the helium leak detection joint are welded with the connecting pipe, so that the sealing is reliable, safe and firm; the outer surface of the helium leak detection joint is gradually increased and is processed by a non-smooth transition process, so that the stability of the connection between the helium detector air suction pipe and the helium leak detection joint is ensured, the friction force between the helium detector air suction pipe and the helium leak detection joint is increased, and the overall sealing performance of the device is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of valve testing, and in particular relates to a valve stem assembly sealing testing device using helium as a testing medium. Background Art

[0002] The sealing performance of valves is one of the key factors for the normal operation of valves, and it plays an important role in controlling the flow of fluids. As one of the key components of valves, the sealing performance of valve stem assemblies is a very important part of valve sealing, which will directly affect the sealing performance and working reliability of valves. In order to ensure the sealing performance of valve stem assemblies and ensure that no leakage occurs, the sealing performance of valve stems needs to be tested. However, due to the limitations of valve stem assembly structure and sealing test requirements, traditional valve stem assembly sealing test devices are difficult to meet the needs of various types of valve stem assemblies and cannot be applied to test conditions with gas as the detection medium. Therefore, designing a test device that can use gas as a valve stem assembly sealing detection medium while also having a certain degree of versatility is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The invention provides a valve stem assembly sealing test device using helium as a test medium according to the valve stem assembly sealing test requirements.

[0004] The present invention is implemented as follows: a valve stem assembly sealing test device using helium as a test medium, which includes a base plate, a helium leak detection joint, and a connecting pipe, wherein the connecting pipe is a cylindrical part made of a rigid material, the connecting pipe is arranged on the base plate, a helium leak detection joint connected to the outside is arranged on the side wall of the connecting pipe, and the valve stem assembly to be tested is arranged on the top of the connecting pipe.

[0005] In the valve stem assembly sealing test device using helium as the test medium as described above, a rubber pad is arranged between the connecting pipe and the valve stem assembly, and the rubber pad is used to increase the sealing performance.

[0006] In the valve stem assembly sealing test device using helium as the test medium as described above, the connecting pipe is welded to the bottom plate.

[0007] In the valve stem assembly sealing test device using helium as the test medium as described above, the helium leak detection joint is welded to the connecting pipe.

[0008] In the valve stem assembly sealing test device using helium as the test medium, the outer surface size of the end of the helium leak detection joint extending out of the connecting pipe increases from small to large and the front end of the joint adopts a non-smooth transition treatment.

[0009] In the valve stem assembly sealing test device using helium as the test medium, the connecting pipe and the compression ring of the valve stem assembly are matched in size, and the rubber pad is arranged between the connecting pipe and the compression ring of the valve stem assembly.

[0010] In the valve stem assembly sealing test device using helium as the test medium as described above, the rubber pad is a fluorine-resistant vacuum rubber pad.

[0011] The remarkable effects of the present invention are: welding technology is adopted between the bottom plate and the helium leak detection joint and the connecting pipe, which ensures reliable sealing, safety and firmness; the outer surface of the helium leak detection joint is processed from small to large and adopts a non-smooth transition process, which not only ensures the stability of the connection between the helium detector suction pipe and the helium leak detection joint, but also increases the friction between the helium detector suction pipe and the helium leak detection joint, ensuring the overall sealing performance of the device. During the test, the valve stem assembly is inserted from the top of the connecting pipe and is directly placed on the soft rubber pad at the top of the connecting pipe, which is convenient and fast, and the detection is efficient. When other types of valve stem assemblies are placed for testing, the rubber pad has good fit due to its soft texture, and can fit valve stem assemblies of different types of structures tightly, thereby ensuring the sealing of the device and having certain applicability. In addition, the rubber pad is a fluorine-resistant vacuum rubber pad, which itself has good sealing and corrosion resistance and is durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a half-section schematic diagram of a valve stem assembly sealing test device provided by the present invention for using helium as a test medium;

[0013] Figure 2 It is a half-section view of a connecting pipe of a valve stem assembly sealing test device provided by the present invention for use with helium as a test medium;

[0014] Figure 3 It is a half-section view of a helium leak detection joint of a valve stem assembly sealing test device using helium as a test medium provided by the present invention;

[0015] Figure 4 It is a half-section view of a rubber pad of a valve stem assembly sealing test device provided by the present invention for use with helium as a test medium;

[0016] Among them: 1. Base plate; 2. Helium leak detection joint; 3. Rubber pad; 4. Connecting pipe. DETAILED DESCRIPTION

[0017] The present invention provides a valve stem assembly sealing test device using helium as a test medium, comprising a bottom plate 1, a helium leak detection joint 2, a rubber pad 3, and a connecting pipe 4. The bottom plate 1 and the connecting pipe are fixed by welding; one end of the helium leak detection joint 3 is inserted into a reserved hole of the connecting pipe 4, and the fixing method is also welding; the rubber pad 3 can be placed flat on the top of the connecting pipe 4, and no other fixing method is required; the bottom plate 1, the helium leak detection joint 2 and the connecting pipe 4 together constitute a welded bottom pipe.

[0018] The specific working process of the present invention is as follows:

[0019] 1. First, place the connecting pipe 4 flat on the surface of the bottom plate 1, pay attention to placing it in the center, and weld the welding pipe and the bottom plate 1 in place along the outer wall of the connecting pipe 4 to ensure that there are no welding defects.

[0020] 2. Then insert the larger end of the helium leak detection joint 2 into the reserved hole of the connecting pipe 4, and weld and fix the helium leak detection joint 2 and the connecting pipe 4.

[0021] 3. After welding is completed, place the welded bottom pipe horizontally on the inspection table and place the rubber pad 3 on the top of the connecting pipe 4.

[0022] 4. Put the suction tube of the helium detector on the outer surface of the helium leak detection connector 2, and push the suction tube forward until it can no longer be pushed to ensure that the connection is tight and firm.

[0023] 5. Place the valve stem assembly on the rubber pad 3, center it, and pay attention to maintaining the stability of the valve stem assembly to prevent it from falling. Turn on the helium detector, evacuate the inside of the welded bottom tube, and then start the test.

[0024] The above specific implementation modes are used to explain the present invention rather than to limit the present invention. Any modification and change made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A valve stem assembly sealing test device using helium as a test medium, characterized in that: The invention comprises a base plate (1), a helium leak detection joint (2), and a connecting pipe (4), wherein the connecting pipe (4) is a cylindrical part made of a rigid material, the connecting pipe (4) is arranged on the base plate (1), a helium leak detection joint (2) connected to the outside is arranged on the side wall of the connecting pipe (4), and a valve stem assembly to be inspected is arranged at the top end of the connecting pipe (4).

2. A valve stem assembly sealing test device using helium as a test medium as claimed in claim 1, characterized in that: A rubber pad (3) is arranged between the connecting pipe (4) and the valve stem assembly, and the rubber pad (3) is used to increase the sealing performance.

3. A valve stem assembly sealing test device using helium as a test medium as claimed in claim 2, characterized in that: The connecting pipe (4) is connected to the bottom plate (1) by welding.

4. A valve stem assembly sealing test device using helium as a test medium as claimed in claim 3, characterized in that: The helium leak detection joint (2) is connected to the connecting pipe (4) by welding.

5. A valve stem assembly sealing test device using helium as a test medium as claimed in claim 4, characterized in that: The outer surface size of the end of the helium leak detection joint (2) extending out of the connecting pipe (4) increases from small to large, and the front end of the joint is processed with a non-smooth transition.

6. A valve stem assembly sealing test device using helium as a test medium as claimed in claim 5, characterized in that: The connecting pipe (4) matches the size of the compression ring of the valve stem assembly, and the rubber pad (3) is arranged between the connecting pipe (4) and the compression ring of the valve stem assembly.

7. A valve stem assembly sealing test device using helium as a test medium as claimed in claim 6, characterized in that: The rubber pad (3) is a fluorine-resistant vacuum rubber pad.

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