Valve performance testing device

Abstract

The utility model relates to the technical field of valve detection, in particular to a valve performance testing device which comprises a vacuum tank, a valve to be tested is arranged in the vacuum tank, an upper interlayer and a lower interlayer are arranged on the upper portion and the lower portion of the valve to be tested respectively, the upper interlayer covers the joint of a valve body and a valve rod of the valve to be tested, and the lower interlayer covers the joint of the valve body and the valve rod of the valve to be tested. The lower interlayer covers the outer wall of a valve body of the to-be-tested valve, two ends of the valve body of the to-be-tested valve are respectively connected with a first input pipeline and a first output pipeline, two sides of the lower interlayer are respectively connected with a second input pipeline and a second output pipeline, and the first input pipeline and the second input pipeline are both used for introducing a refrigerant. The upper interlayer is provided with leak detection holes. According to the utility model, the actual use condition of the to-be-tested valve is effectively simulated, the use cost and the maintenance cost are low, the structure is simple, and the test is convenient, safe and rapid.

Description

Technical Field

[0001] The utility model relates to the technical field of valve detection, in particular to a valve performance testing device. Background Art

[0002] Cryogenic technology is not only closely related to people's contemporary high-quality life, but also inseparable from many cutting-edge scientific research in the world. With the development of modern science and technology, industrial production, new energy development and aerospace industry, cryogenic valves have been used in many occasions. Cryogenic valves are widely used, but they are also prone to leakage and have high manufacturing requirements. Since cryogenic valves mostly work in ultra-low temperature areas below liquid nitrogen temperature, compared with conventional valves, they have special requirements in material selection, structural design, manufacturing process and performance testing.

[0003] Therefore, in addition to normal temperature inspection, cryogenic valves must also undergo low temperature tests. The main purpose of low temperature tests is to test the operating performance and sealing performance of cryogenic valves under low temperature conditions. Operating performance requires that the valve be flexible to open and close, and the valve stem and valve seat cannot be deformed and stuck due to low temperature. Sealing performance requires that the leakage of the valve sealing surface is less than the allowable leakage.

[0004] The leak detection method used in the performance test of normal temperature valves is relatively simple. According to the different requirements of the allowable leakage rate index, the airtightness inspection can be carried out by flow meter detection method, liquid drainage and gas collection method, helium mass spectrometer leak detection method, soap liquid coating method and bubble counting method. After the test environment changes from normal temperature to low temperature, the working mechanism of the valve has changed greatly, and the sealing materials, sealing structure forms and manufacturing process methods of the sealing structure used in the corresponding parts and components, as well as the airtightness leak detection method have also changed greatly. Conventional methods cannot detect the performance of the valve, so there is an urgent need for a valve performance test device for low temperature testing. Utility Model Content

[0005] The purpose of the utility model is to provide a valve performance testing device that can solve the above technical problems.

[0006] The utility model provides a valve performance testing device, comprising a vacuum tank, wherein a valve to be tested is arranged in the vacuum tank, an upper interlayer and a lower interlayer are respectively arranged at the upper and lower parts of the valve to be tested, the upper interlayer covers the connection between the valve body and the valve stem of the valve to be tested, the lower interlayer covers the outer wall of the valve body of the valve to be tested, the two ends of the valve body of the valve to be tested are respectively connected to a first input pipeline and a first output pipeline, the two sides of the lower interlayer are respectively connected to a second input pipeline and a second output pipeline, the first input pipeline and the second input pipeline are both used for passing a refrigerant, and a leak detection hole is arranged on the upper interlayer.

[0007] Furthermore, the inlet ends of the first input pipeline and the second input pipeline are connected to a refrigerant tank.

[0008] Furthermore, the cryogen tank contains one of liquid helium or liquid hydrogen.

[0009] Furthermore, it also includes a gas supply device, which includes a gas supply pipeline connected to the first input pipeline, and the gas supply pipeline is communicated with a helium tank.

[0010] Furthermore, the leak detection hole is connected to a test hose, and the air outlet end of the test hose is placed in water. When the test hose is placed in water, if bubbles are generated, it means that the valve to be tested has a leak. The leak detection hole is provided with threads and is threadedly connected to the test hose.

[0011] Furthermore, the leak detection hole is connected to a helium detector, and helium enters the valve to be tested through the gas supply pipeline and the first input pipeline in sequence. If the valve leaks, the helium leaks into the upper interlayer and is discharged through the leak detection hole and detected by the helium detector. Helium is used as the exploration gas to quickly detect the leak of the valve to be tested, because helium is an inert gas, does not pollute the atmosphere, and is safe to use; helium has a small atomic weight and low viscosity, and is easy to penetrate any possible leak rate, with high detection sensitivity, fast speed, and a wide range of applications; in addition, the content of helium in the atmosphere is extremely small and is not easily interfered with.

[0012] Furthermore, the gas supply device also includes a purge pipe connected to the first input pipe, and the purge pipe is communicated with a nitrogen tank. The purge is performed before and after the test to remove impurities in the pipe and ensure the cleanliness and safe operation of the pipe system.

[0013] In addition, a booster pump is provided on the purge pipeline. The nitrogen tank, purge pipeline and booster pump constitute a nitrogen booster system, so that the nitrogen can reach the valve to be tested, thereby performing a pressure test on the valve to be tested.

[0014] Furthermore, the first input pipeline, the second input pipeline, the first output pipeline, the second output pipeline, the air supply pipeline and the purge pipeline are all provided with stop valves, and the first input pipeline, the second input pipeline, the air supply pipeline and the purge pipeline are also provided with pressure gauges. In addition, according to the requirements of transportation, each of the above-mentioned input pipelines can be provided with a pump.

[0015] Furthermore, a valve stem extension rod is fixedly connected to the upper end of the valve stem of the valve to be tested, and the valve stem extension rod passes through the upper interlayer and the vacuum tank in sequence and is located on the outside of the vacuum tank. An operating hand wheel is fixedly connected to the upper end of the valve stem extension rod, and the switch of the valve to be tested is controlled by rotating the operating hand wheel.

[0016] Furthermore, a sealing ring is provided at the connection between the valve stem extension rod and the upper interlayer, and the sealing ring enables the valve stem extension rod to fit and seal with the upper interlayer.

[0017] Beneficial effects:

[0018] The utility model covers the upper and lower parts of the valve to be tested with an upper interlayer and a lower interlayer respectively, wherein the upper interlayer is arranged at the connection between the valve body and the valve stem of the valve to be tested, and a leak detection hole is arranged on the upper interlayer to test the sealing performance of the valve; a refrigerant is transported to the inside of the valve and the lower interlayer through a first input pipeline and a second input pipeline, thereby realizing detection under internal cooling and external cooling conditions, effectively simulating the actual use of the valve to be tested, and having low use cost and maintenance cost, a simple structure, and convenient, safe and fast testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the testing principle of the utility model;

[0021] Figure 2 It is a schematic diagram of the external structure of the utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the support device used to display the utility model;

[0023] Figure 4 It is a schematic diagram of the internal structure of the utility model.

[0024] Explanation of the accompanying drawings: 1-vacuum tank, 2-valve to be tested, 201-valve body, 3-upper interlayer, 301-leak detection hole, 302-test hose, 4-lower interlayer, 501-first input pipeline, 502-second input pipeline, 601-first output pipeline, 602-second output pipeline, 7-refrigerant tank body, 8-gas supply pipeline, 801-helium tank, 9-purge pipeline, 901-nitrogen tank, 10-stop valve, 11-pressure gauge, 12-valve stem extension rod, 13-operating hand wheel, 14-sealing ring, 15-ultra-low temperature sensor, 16-support ear seat, 17-support frame, 18-safety valve. DETAILED DESCRIPTION

[0025] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] Example 1

[0029] A valve performance testing device comprises a vacuum tank 1, wherein a valve 2 to be tested is arranged in the vacuum tank 1, an upper interlayer 3 and a lower interlayer 4 are arranged at the upper and lower parts of the valve 2 to be tested, respectively, the upper interlayer 3 covers the connection between the valve body 201 and the valve stem of the valve 2 to be tested, the lower interlayer 4 covers the outer wall of the valve body 201 of the valve 2 to be tested, the two ends of the valve body 201 of the valve 2 to be tested are respectively connected to a first input pipeline 501 and a first output pipeline 601, the two sides of the lower interlayer 4 are respectively connected to a second input pipeline 502 and a second output pipeline 602, the inlet ends of the first input pipeline 501 and the second input pipeline 502 are connected to a cryogen tank body 7, the cryogen tank body 7 contains one of liquid helium or liquid hydrogen, and the first input pipeline 501 and the second input pipeline 502 are both used for passing the cryogen.

[0030] It also includes a gas supply device, which includes a gas supply pipeline 8 connected to the first input pipeline 501, the gas supply pipeline 8 is connected to the helium tank 801, and the upper interlayer 3 is provided with a leak detection hole 301, the leak detection hole 301 is connected to a helium detector, and helium passes through the gas supply pipeline 8 and the first input pipeline 501 in turn to enter the valve 2 to be tested. If the valve leaks, the helium leaks into the upper interlayer 3 and is discharged through the leak detection hole 301 and is detected by the helium detector. Helium is used as the exploration gas to quickly detect the leak of the valve to be tested, because helium is an inert gas, does not pollute the atmosphere, and is safe to use; helium has a small atomic weight and low viscosity, and is easy to penetrate any possible leak rate, and has high detection sensitivity, fast speed, and a wide range of applications; in addition, the content of helium in the atmosphere is extremely small and is not easily interfered with. In addition, the leak detection hole 301 can also be connected to a test hose 302. Specifically, the leak detection hole is provided with threads and is threadedly connected to the test hose. The air outlet end of the test hose is placed in water. When the test hose is placed in water, if bubbles are generated, it means that the valve to be tested is leaking. The leak detection hole is provided with threads and is threadedly connected to the test hose.

[0031] The gas supply device also includes a purge pipe 9 connected to the first input pipe 501. The purge pipe 9 is communicated with the nitrogen tank 901. The purge pipe 9 is purged before and after the test to remove impurities in the pipe and ensure the cleanliness and safe operation of the pipe system. In addition, a booster pump is also provided on the purge pipe 9. The nitrogen tank 901, the purge pipe 9 and the booster pump constitute a nitrogen boosting system, so that the nitrogen reaches the valve 2 to be tested, thereby performing a pressure test on the valve to be tested.

[0032] The first input pipeline 501, the second input pipeline 502, the first output pipeline 601, the second output pipeline 602, the air supply pipeline 8 and the purge pipeline 9 are all provided with a stop valve 10, and the first input pipeline 501, the second input pipeline 502, the air supply pipeline 8 and the purge pipeline 9 are also provided with a pressure gauge 11. In addition, according to the requirements of transportation, each of the above-mentioned input pipelines can be provided with a pump.

[0033] In order to facilitate the opening and closing of the valve 2 to be tested, the upper end of the valve stem of the valve 2 to be tested is fixedly connected with a valve stem extension rod 12. Specifically, the valve stem extension rod 12 is detachably connected to the valve stem of the valve 2 to be tested. For example, a slot is provided at the upper end of the valve stem of the valve to be tested, and the lower end of the valve stem extension rod is connected to the slot. The valve stem extension rod 12 passes through the upper interlayer 3 and the vacuum tank 1 in sequence and is located outside the vacuum tank 1. The upper end of the valve stem extension rod 12 is fixedly connected with an operating hand wheel 13. By rotating the operating hand wheel 13, the opening and closing of the valve 2 to be tested is controlled. A sealing ring 14 is provided at the connection between the valve stem extension rod 12 and the upper interlayer 3. The sealing ring 14 makes the valve stem extension rod 12 fit and seal with the upper interlayer 3.

[0034] The utility model further comprises a supporting device, which comprises a supporting frame 17 , the supporting frame 17 is fixedly connected to a supporting ear seat 16 , and the supporting ear seat 16 is fixedly connected to an outer wall of the vacuum tank 1 .

[0035] Example 2

[0036] like Figure 2 As shown, the basic structure is the same as that of Example 1. The outlet end of the valve to be tested 2 is connected to another valve to be tested. In this embodiment, the other valve to be tested adopts a safety valve 18 (the application scenario of the safety valve does not need to reach an excessively low temperature). The safety valve 18 can be connected after the valve to be tested 2, and the refrigerant flowing through the valve to be tested 2 enters the safety valve 18. The refrigerant to be recovered can be used to cool the safety valve 18. For the specific safety valve test structure, please refer to Example 1 and the following working and use process, which will not be repeated here.

[0037] Working and use process:

[0038] When the internal cooling method is used to detect the valve to be tested, the vacuum tank 1 and the lower interlayer 3 are first evacuated (a vacuum port is provided on the lower interlayer), and then the refrigerant is introduced into the valve body 201 through the first input pipe 501, so that the valve to be tested 2 gradually reaches the test temperature. When the temperature drops to a specified value (an ultra-low temperature sensor 15 is provided in the lower interlayer), the refrigerant is released through the first output pipe 601, and then helium of a specified pressure is introduced through the gas supply pipe 8, and the valve can be tested under low temperature conditions, such as whether the valve stem and the valve seat are deformed and stuck due to low temperature.

[0039] When the external cooling method is used to detect the valve, the vacuum tank 1 is first evacuated, and then the refrigerant is introduced into the lower interlayer 4 through the second input pipe 502. After the refrigerant flows through the lower interlayer 4 for a period of time, the temperature of the valve 2 to be tested is reduced to the test temperature, and nitrogen is introduced into the valve 2 to be tested through the purge pipe 9. After reaching the test pressure, the valve can be tested under low temperature conditions, such as whether the valve stem and the valve seat are deformed and stuck due to low temperature.

[0040] Matters not covered in this utility model are known technologies.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A valve performance testing device, characterized in that It comprises a vacuum tank, in which a valve to be tested is arranged, an upper interlayer and a lower interlayer are respectively arranged at the upper and lower parts of the valve to be tested, the upper interlayer covers the connection between the valve body and the valve stem of the valve to be tested, the lower interlayer covers the outer wall of the valve body of the valve to be tested, the two ends of the valve body of the valve to be tested are respectively connected with a first input pipeline and a first output pipeline, the two sides of the lower interlayer are respectively connected with a second input pipeline and a second output pipeline, the first input pipeline and the second input pipeline are both used for passing refrigerant, and a leak detection hole is arranged on the upper interlayer.

2. The valve performance testing device according to claim 1, characterized in that: The inlet ends of the first input pipeline and the second input pipeline are connected with a refrigerant tank.

3. The valve performance testing device according to claim 2, characterized in that: The cryogen tank contains one of liquid helium or liquid hydrogen.

4. The valve performance testing device according to claim 1, characterized in that: It also includes a gas supply device, which includes a gas supply pipeline connected to the first input pipeline, and the gas supply pipeline is communicated with a helium tank.

5. The valve performance testing device according to claim 4, characterized in that: The leak detection hole is connected with a test hose, and the air outlet end of the test hose is placed in water.

6. The valve performance testing device according to claim 4, characterized in that: The leak detection hole is connected with a helium detector.

7. The valve performance testing device according to claim 4, characterized in that: The gas supply device also includes a purge pipeline connected to the first input pipeline, and the purge pipeline is communicated with a nitrogen tank.

8. The valve performance testing device according to claim 7, characterized in that: The first input pipeline, the second input pipeline, the first output pipeline, the second output pipeline, the air supply pipeline and the purge pipeline are all provided with stop valves, and the first input pipeline, the second input pipeline, the air supply pipeline and the purge pipeline are also provided with pressure gauges.

9. The valve performance testing device according to claim 1, characterized in that: The upper end of the valve stem of the valve to be tested is fixedly connected to a valve stem extension rod, which passes through the upper interlayer and the vacuum tank in sequence and is located outside the vacuum tank, and the upper end of the valve stem extension rod is fixedly connected to an operating handwheel.

10. The valve performance testing device according to claim 9, characterized in that: A sealing ring is provided at the connection between the valve stem extension rod and the upper interlayer.

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