CN212539610U

CN212539610U - Low-temperature valve test bed

Info

Publication number: CN212539610U
Application number: CN202021669044.0U
Authority: CN
Inventors: 郑亚青; 孙璐璐; 刘超; 郑通; 王程永; 王小佚
Original assignee: Beijing Startech Co ltd
Current assignee: Beijing Startech Co ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2021-02-12
Anticipated expiration: 2030-08-12

Abstract

The utility model discloses a low temperature valve test bench relates to the experimental technical field of valve, including test bench, pressure boost distribution unit, medium container, conveying medium pipeline, the valve of being tried and observing and controlling system, the valve of being tried is installed on the test bench, and pressure boost distribution unit is installed by valve, pressure reducer, manometer and is constituteed on pressure boost distribution unit pipeline. Its structural design is reasonable, can satisfy the valve detection requirement of high reliability operating mode, and various use operating modes of true simulation valve have low temperature test kind commonality wide, and reliability and security are high characteristics, are the supplementary of current valve test detection device, have effectively compensatied the not enough of prior art, have satisfied actual conditions's needs.

Description

Low-temperature valve test bed

Technical Field

The utility model belongs to the technical field of the experimental technique of valve and specifically relates to a low temperature valve test bench.

Background

The valve is divided into three types of low temperature, normal temperature and high temperature according to the service temperature working condition, and according to international and Chinese special equipment inspection standards, each type of valve is detected according to the valve service condition to ensure the safety of the valve. The low-temperature valve is used for low-temperature liquid media such as liquid hydrogen, liquid nitrogen, liquid oxygen, LNG and the like, or the use environment temperature is lower than minus 40 ℃, the on-off control form of the low-temperature valve comprises a manual valve, a pneumatic valve and an electric valve (comprising an electromagnetic valve), and how to perform low-temperature tests on the valves is important for judging the qualification of the valves. The valve low-temperature test method is that the valve is placed in a liquid nitrogen tank and is cooled by liquid nitrogen, and after the valve reaches the liquid nitrogen temperature, normal-temperature nitrogen or helium is introduced into the valve to serve as leakage test gas for detecting the tightness of the valve; filling nitrogen with designed pressure into the valve at low temperature to perform strength test of the valve; the valve at low temperature was tested for open and close without load to check the flexibility of the valve. However, the formulation of the national low-temperature valve device can only meet the requirements of average level and test equipment capacity of manufacturers, the low-temperature test methods are not good for valves with low requirements, but for low-temperature valves in the industries of aerospace, nuclear power and the like with high reliability requirements, the test detection device is too coarse, and the detection data of the valve test is not consistent with the real condition, so that the valve which is qualified in detection sometimes has accidents on a working line. The defects of the universal specification of the low-temperature valve detection are as follows: 1. the valve is cooled by soaking the valve in liquid nitrogen, the valve shell reaches a low-temperature state, but after the leakage testing medium is normal-temperature nitrogen or helium gas, the temperature of the valve body rises, so that the liquid nitrogen for soaking the valve boils, the judgment that the valve is the liquid nitrogen boiling caused by leakage is difficult, and the valve can be observed whether the valve really leaks or not only by standing for a long time and keeping the temperature balanced; 2. when the charged normal temperature gas enters the valve, the temperature is also reduced, the volume is reduced, the gas is continuously charged until the pressure is stable, and whether the valve leaks or not is judged by the pressure drop change to be more infeasible; 3. the valve body strength test uses a gas medium to test the pressure, so that the danger is high, the pressure can be replaced by water pressure at normal temperature, and the use condition of the valve cannot be simulated; 4. the liquid nitrogen soaking method has great difficulty in electric and pneumatic valve tests, the valve execution structure is easy to damage, and the magnetism of an electromagnet of the electromagnetic valve is also changed greatly in a liquid nitrogen environment; 5. some test systems also adopt a test method of introducing low-temperature media such as liquid nitrogen and the like into the valve, but the test system can only be carried out at the temperature of a single medium, and cannot simulate the use working condition of the temperature higher than that of the test medium, particularly the working condition of low-temperature gas and gas-liquid two-phase state.

Disclosure of Invention

The utility model aims to overcome the not enough of prior art, provide a low temperature valve test bench.

The utility model discloses a low temperature valve test bench, including test bench, pressure boost distribution unit, medium container, conveying medium pipeline, the valve and the system of observing and controling, the valve is installed on the test bench to be examined, and pressure boost distribution unit is installed by valve, pressure reducer, manometer and is constituteed on the pressure boost distribution unit pipeline, the import intercommunication on pressure boost distribution unit pipeline and the top of medium container is equipped with the filling valve on the medium container and goes out the medium valve, and medium container bottom export is through conveying medium pipeline and the valve intercommunication of being examined, is equipped with the filter on the conveying medium pipeline, be equipped with on the pipeline of valve entry to be examined preceding exhaust port an, outlet pipe and examine leakage orifice b and medium discharge port c on the road.

As a further improvement of the utility model, the pipeline that is equipped with leak hunting valve, medium discharge port c place on the pipeline that is equipped with preceding exhaust valve, leak hunting mouth b place on the pipeline at preceding exhaust port a place is equipped with the medium discharge valve.

As a further improvement of the utility model, the conveying medium pipeline is provided with a bypass pipeline to connect the heater.

As a further improvement, the medium container upper part is provided with a safety valve and an exhaust valve, and a pressure sensor is arranged on the exhaust pipeline.

As the utility model discloses a further improvement is installed valve switch executor and two-position five-way solenoid valve on the valve of being tried, the export intercommunication of pipeline and helium gas distribution unit is passed through in the import of two-position five-way solenoid valve, helium gas distribution unit includes helium bottle, manual valve and establishes the relief pressure valve on the intercommunication pipeline.

As a further improvement, the two sides of the tested valve on the test bench are provided with parallel guide rails, and the protective cover covers the tested valve and is provided with a sliding groove matched with the guide rails on the two sides.

As a further improvement, the measurement and control system is composed of a sensor, a data acquisition unit and a computer.

The utility model discloses a low temperature valve test bench, structural design is reasonable, can satisfy the valve detection requirement of high reliability operating mode, and various use operating modes of true simulation valve have low temperature test kind commonality wide, and reliability and high characteristics of security are a replenishment of current valve test detection device, have effectively compensatied the not enough of prior art, have satisfied actual conditions's needs.

Drawings

Fig. 1 is a flow chart of a cryogenic valve testing system of the present invention;

fig. 2 is a structural schematic diagram of a low-temperature valve test bed of the present invention.

Detailed Description

The utility model discloses a low temperature valve test bench, including test bench 15, pressure boost distribution unit 1, medium container 2, conveying medium pipeline 3, by examination valve 5 and observing and controlling system 9, being examined valve 5 and installing on test bench 15, being examined valve 5's both sides and being equipped with parallel guide rail 13, protection casing 11 covers on being examined valve 5 and both sides are equipped with the spout and cooperate with guide rail 13. The pressure-increasing gas distribution unit 1 is composed of a valve, a pressure reducer and a pressure gauge which are arranged on a pressure-increasing gas distribution unit pipeline, a pressure reducing valve and more than one pressure sensor are arranged on the pressure-increasing gas distribution unit pipeline, the pressure sensors are arranged at two ends of the pressure reducing valve, the pressure-increasing gas distribution unit pipeline is communicated with an inlet at the top end of a medium container 2, a filling valve and a medium outlet valve are arranged at the bottom of the medium container 2, a safety valve and an exhaust valve are arranged at the top of the medium container 2, the pressure sensor is arranged on an exhaust pipeline, a bottom outlet of the medium container 2 is communicated with a tested valve 5 through a medium conveying pipeline 3, a filter is arranged on the medium conveying pipeline 3, a bypass pipeline is arranged on the medium conveying pipeline 3 and is connected with a heater 4, a front exhaust port a is arranged on a pipeline at the inlet of the tested valve 5, a leakage detecting port, The device comprises a helium gas distribution unit 7, a leakage detection valve 12, a medium discharge valve 14, a valve switch actuator 6 and a two-position five-way electromagnetic valve 8, wherein the pipeline where a leakage detection port b is located is arranged, the pipeline where a medium discharge port c is located is arranged, the tested valve 5 is provided with the valve switch actuator 6 and the two-position five-way electromagnetic valve 8, the inlet of the two-position five-way electromagnetic valve 8 is communicated with the outlet of the helium gas distribution unit 7 through a pipeline, the helium gas distribution unit 7 comprises a helium gas bottle, a manual valve and a pressure reducing valve and a pressure sensor which are arranged on the communicated pipeline, and a measurement and control system 9 is composed of a sensor.

The embodiment of the present invention takes the pneumatic valve test as an example for the following explanation:

1. preparation before the test: firstly, a tested valve 5 is installed on a test bed 15, a medium inlet and outlet pipeline and a control gas circuit pipeline of the tested valve 5 are connected, the valve is wrapped by a heat-preservation cotton tape, and a measurement and control system 9 is started to be in a normal working state;

2. and (3) system blowing and medium filling stages: blowing the medium container 2, the medium conveying pipeline 3 and the tested valve 5 clean by using dry compressed air or nitrogen;

3. filling stage: filling the medium container 2 with the low-temperature medium through a filling valve on the medium container 2;

4. pre-cooling stage of the tester: after the low-temperature medium is filled, a pressurizing gas distribution unit 1 is started to pressurize the medium in a medium container 2, the flow of the medium is adjusted through a valve on a medium conveying pipeline 3, a tested valve 5 is pre-cooled, when the tested valve 5 needs to be pre-cooled in a closed state, a front exhaust valve 10 is arranged on a pipeline where a front exhaust port a is opened, the pre-cooling speed can be increased, liquid nitrogen is pre-cooled in a low-flow state, and when the tested valve 5 reaches the temperature of the test medium, the pre-cooling is finished;

5. and (3) checking air tightness: the medium container 2 is pressurized to a valve test pressure through the pressurizing and air distributing unit 1, a medium discharge valve 14 arranged on a pipeline where a medium discharge port c is located after the tested valve 5 is closed, a leakage detection valve 12 arranged on a pipeline where a leakage detection port b is located is opened, the leakage rate of the tested valve 5 can be detected by a bubble method, and the distance between the leakage detection valve 12 and the medium discharge valve 14 is as short as possible, so that the volume of an inner cavity of the pipeline can be reduced, and the leakage detection sensitivity is improved;

6. valve action test: according to the test pressure of the tested valve 5, opening the measurement and control system 9, closing the two-position five-way electromagnetic valve 8 on the pipeline where the helium gas distribution unit 7 is located, and after the valve is switched on and off for a plurality of times, carrying out air tightness inspection according to the content of the above 6;

7. testing the service life of the valve: setting the test times of the switch of the tested valve 5 through a test control program in the test control system 9, carrying out the switch life test on the tested valve 5, and closing the medium discharge valve 14 in the test process to save the medium;

8. simulating various low-temperature tests; when the use temperature of the tested valve 5 is higher than the temperature of liquid nitrogen and the valve is required to be tested according to the actual use working condition temperature, the heater 4 is installed on the test bed 15, wherein the heater 4 can be an electric heater or a gasifier capable of naturally heating, a medium supply path provided with the heater 4 is opened, the liquid nitrogen is heated by the heater 4 according to the required temperature to reach the test temperature, and the test contents are repeated;

9. and (3) testing the strength and the integral sealing performance of the valve: all valves at the outlet of the tested valve 5 are closed, the pressure of the inlet medium is increased to the test pressure of the tested valve 5, the heat insulation layer of the valve is opened, and the leakage condition of the tested valve 5 is remotely observed by a camera;

10. and (4) finishing the test: and (3) disassembling the tested valve 5, sealing and protecting, recovering to normal temperature, simultaneously stopping pressurizing and distributing gas, exhausting the medium container 2, closing a control gas valve on the helium tank, sealing and protecting pipelines and containers under all low-temperature systems, and preventing water vapor from entering the pipeline system.

Claims

1. A low-temperature valve test bed comprises a test bed frame (15), a pressurization gas distribution unit (1), a medium container (2), a medium conveying pipeline (3), a tested valve (5) and a measurement and control system (9), wherein the tested valve (5) is arranged on the test bed frame (15), it is characterized in that the pressure-increasing gas distribution unit (1) is composed of a valve, a pressure reducer and a pressure gauge which are arranged on a pipeline of the pressure-increasing gas distribution unit, the pressurizing air distribution unit pipeline is communicated with an inlet at the top end of the medium container (2), a filling valve and a medium outlet valve are arranged on the medium container (2), an outlet at the bottom end of the medium container (2) is communicated with a tested valve (5) through a medium conveying pipeline (3), a filter is arranged on the medium conveying pipeline (3), the pipeline at the inlet of the tested valve (5) is provided with a front exhaust port a, and the outlet pipeline is provided with a leakage detection port b and a medium discharge port c.

2. The cryogenic valve test stand according to claim 1, wherein a front vent valve (10) is provided on a pipeline where the front vent port a is located, a leak detection valve (12) is provided on a pipeline where the leak detection port b is located, and a medium discharge valve (14) is provided on a pipeline where the medium discharge port c is located.

3. A cryogenic valve test stand according to claim 1, characterized in that the medium supply line (3) is provided with a bypass line to which the heater (4) is connected.

4. A cryogenic valve test rig according to claim 1, characterized in that the upper part of the medium container (2) is provided with a safety valve and a vent valve, and the vent line is provided with a pressure sensor.

5. The cryogenic valve test stand according to claim 1, wherein the tested valve (5) is provided with a valve switch actuator (6) and a two-position five-way solenoid valve (8), an inlet of the two-position five-way solenoid valve (8) is communicated with an outlet of a helium gas distribution unit (7) through a pipeline, and the helium gas distribution unit (7) comprises a helium gas bottle, a manual valve and a pressure reducing valve arranged on a communication pipeline.

6. The cryogenic valve test stand according to claim 1, wherein parallel guide rails (13) are arranged on the test stand (15) and on both sides of the tested valve (5), the protective cover (11) covers the tested valve (5), and sliding grooves are arranged on both sides of the protective cover and are matched with the guide rails (13).

7. The cryogenic valve test stand of claim 1, wherein the measurement and control system (9) is comprised of a sensor, a data collector, and a computer.