An intelligent control device for valve leakage detection gas pressurization, helium automatic recovery, recycling and reuse

Abstract

An intelligent control device for gas pressurization and automatic helium recovery and recycling in valve leakage detection. The valve low-temperature detection helium rapid recovery and recycling device is connected to the valve leakage detection high-pressure gas pressurization and room-temperature helium collection and integration device through a high-pressure hose. The PLC programmed control touch display upper computer monitoring system is communicatively connected to the valve leakage detection high-pressure gas pressurization and room-temperature helium collection and integration device and the valve low-temperature detection helium rapid recovery and recycling device. Advantages: It realizes functions such as gas pressurization in the valve leakage detection process, helium recovery / storage / circulation use in the normal-temperature / low-temperature / high-temperature helium leak detection process, control signals for driving various industrial process control valves, automatic temperature monitoring in the valve high-low temperature test process, automatic pressure monitoring in the test process, and automatic monitoring of helium recovery.

Description

Technical Field

[0001] The present invention relates to an intelligent control device for valve leakage detection air pressurization and helium automatic recovery and recycling. Background Art

[0002] Currently, green, low-carbon circular economy, dual-carbon economy, energy conservation and environmental protection have become the mainstream of industrial economic development. Valves are special equipment pressure pipeline components and are key mechanical components used to control the on-off, flow rate, pressure, and temperature of fluid media in fluid pipelines. Among the failures that occur in petrochemical, power, gas, cryogenic refrigeration, and coal chemical industrial processes, valve failures or accidents and environmental hazards and energy losses caused by valve-induced leaks account for the majority, which shows the importance of valves in the development of green and low-carbon industries.

[0003] Leakage, corrosion, and wear are collectively referred to as the three main factors causing economic losses in industrial processes. Leakage detection is one of the important indicators of valves and is a key indicator for measuring the quality of valves.

[0004] In recent years, with the update and progress of valve technology, the standardization of valve products has further been in line with international standards, gradually replacing imported products with domestic ones, and the development of major energy equipment fields (such as the LNG industry, hydrogen energy industry, large ethylene project industry, refining, gas, wellhead devices, and Christmas trees) has further highlighted the necessity of often-temperature, high-temperature, and even low-temperature air pressure (including high-pressure gas) leakage and fugitive emission detection after valves leave the factory. These detection indicators have become important indicators for evaluating the application of valve products under the above-mentioned working conditions, and are also the key technical indicators for verifying whether the design of such products is finalized and meeting the requirements of user working conditions, and have been adopted by the majority of users.

[0005] Key standards for common valves: ISO 28921-1:2022 "Industrial valves - Isolation valves for cryogenic service - Part 1: Design, manufacture and production testing", GB / T 24925-2019 "Technical conditions for cryogenic valves", MSS SP 134-2012 "Requirements for cryogenic valves and their body / bonnet extension bodies", API 6D-2021 "Specification for pipeline and piping valves", ISO 15848-1:2015 "Measurement, test and qualification procedures for fugitive emissions from industrial valves - Part 1: Classification and qualification procedures for valve type tests", MESCS PE 77 / 300-2017 "Test procedures and technical specifications for industrial valve type verification tests (TAT)", VDI 2400-2021 "Leakage rate - Leakage control in mineral oil refineries". During the high-pressure gas test, fugitive emissions test, and cryogenic test of valves, the most commonly used gas medium is helium. Helium is an inert gas with stable chemical properties, a small molecular weight, and strong permeability. It is an excellent leakage detection medium, but it is also an expensive non-renewable rare gas. In the past decade, the price of helium has increased by 4 to 5 times. For example, a 40L bottle of helium with a pressure of about 13MPa has risen from about 700 yuan per bottle in 2011 to about 3000 yuan per bottle currently, greatly increasing the overall production cost of valves and being unfavorable to the technological innovation and healthy development of factories.

[0006] According to the analysis and prediction of the test data of this center, for example, about 50% or even more of the annual helium detection fee income of 1 million yuan is required for the purchase of helium (consumables, test gas). If helium recovery is adopted, this payment is expected to be reduced to 20% to 30%. This not only greatly reduces the detection cost, but also drives a significant reduction in the overall manufacturing cost of valve enterprises, better serves enterprises, and boosts high-quality development.

[0007] After the helium leak detection test in the high-pressure gas test, fugitive emissions test, and cryogenic test of valves, helium cannot be recovered (especially in the cryogenic test of valves). The problems of low helium recovery safety, low recovery efficiency, and low degree of automation / intelligence / intensification of the device (such as the diverse signals for driving valve actions require a large number of miscellaneous instruments or devices, and the temperature / pressure sensing and monitoring cannot be automatically recorded) bring high production costs and prominent safety problems, and thus weaken the technology development ability of factories. This has become a key common technical problem in the industry that restricts the rapid development of low-fugitive valves, cryogenic valves, high-reliability high-duty valves, and high-performance valves to achieve domestic substitution for imports. Summary of the Invention

[0008] The purpose of the present invention is to solve the existing technical problems and propose an intelligent control device for valve leakage detection gas pressurization and automatic helium recovery and recycling.

[0009] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a valve leakage detection gas boosting and helium automatic recovery and recycling intelligent control device, including a valve leakage detection high-pressure gas boosting and room temperature helium recovery integrated device, a valve low-temperature detection helium rapid recovery and recycling device and a PLC program-controlled touch display host computer monitoring system. The valve low-temperature detection helium rapid recovery and recycling device is connected to the valve leakage detection high-pressure gas boosting and room temperature helium recovery integrated device through a high-pressure hose, and the PLC program-controlled touch display host computer monitoring system is communicatively connected with the valve leakage detection high-pressure gas boosting and room temperature helium recovery integrated device and the valve low-temperature detection helium rapid recovery and recycling device.

[0010] Furthermore, one end of the valve body under test is connected to one end of a valve leakage detection high-pressure gas boosting and room temperature helium recovery integrated device and a valve low-temperature detection helium rapid recovery and recycling device through a high-pressure hose.

[0011] Furthermore, the valve leakage detection high-pressure gas boosting and room temperature helium recovery integrated device includes a medium-pressure needle valve, a high-pressure gas pressure reducing valve, a gas filter, a pressure sensor, a one-way valve, a helium recovery pump, a pressure gauge, a safety relief valve, a gas cylinder group, a low-pressure ball valve, a solenoid valve, a driving gas pressure reducing valve, a driving gas, a high-pressure needle valve, and a gas booster pump; one end of the first high-pressure needle valve is connected to the valve low-temperature detection helium rapid recovery and recycling device through a high-pressure hose, and the other end of the first high-pressure needle valve is respectively connected to the second high-pressure needle valve, the third high-pressure needle valve, the fourth high-pressure needle valve and one end of the valve body to be tested; the other end of the third high-pressure needle valve is respectively connected to two air outlets of the gas booster pump, the first pressure sensor and one end of the fifth high-pressure needle valve, and the other end of the fifth high-pressure needle valve is connected to the first pressure gauge; the two air inlets of the gas booster pump are respectively connected to the second pressure sensor, the sixth high-pressure needle valve and one end of the first high-pressure gas pressure reducing valve after being collected through a pipeline, and the other end of the sixth high-pressure needle valve is connected to the second A pressure gauge, the other end of the first high-pressure gas pressure reducing valve is connected to one end of the seventh high-pressure needle valve, the other end of the seventh high-pressure needle valve is respectively connected to a gas cylinder group and one end of the first medium-pressure needle valve, the other end of the first medium-pressure needle valve is respectively connected to another gas cylinder group, the second medium-pressure needle valve, the third medium-pressure needle valve, the fourth medium-pressure needle valve and one end of the third pressure sensor, the other end of the second medium-pressure needle valve is connected to the safety relief valve, the other end of the third medium-pressure needle valve is respectively connected to the third pressure gauge, the other end of the fourth medium-pressure needle valve is connected to the two outlets of the helium recovery pump, the two air inlets of the helium recovery pump are collected together through pipelines and respectively connected to the fourth pressure sensor and one end of the first gas filter, the other end of the first gas filter is connected to one end of the second high-pressure gas pressure reducing valve, the other end of the second high-pressure gas pressure reducing valve is respectively connected to the other end of the fourth high-pressure needle valve and one end of the fifth medium-pressure needle valve, and the other end of the fifth medium-pressure needle valve is connected to the valve low-temperature detection helium rapid recovery and recycling device through a high-pressure hose.

[0012] Furthermore, first one-way valves are provided at the two air outlets and two air inlets of the air booster pump; second one-way valves are provided at the two air outlets and two air inlets of the helium recovery pump.

[0013] Furthermore, the air booster pump is connected to one end of the first low-pressure ball valve and the first solenoid valve. The other ends of the first low-pressure ball valve and the first solenoid valve are both connected to one end of the first driving air pressure reducing valve. A fourth pressure gauge is also provided between the first driving air pressure reducing valve and one ends of the first low-pressure ball valve and the first solenoid valve. The other end of the first driving air pressure reducing valve is respectively connected to one end of the second air filter and the second driving air pressure reducing valve. The other end of the second air filter is connected to the driving air; the other end of the second driving air pressure reducing valve is respectively connected to one end of the second low-pressure ball valve and the second solenoid valve. A fifth pressure gauge is also provided between the other end of the second driving air pressure reducing valve and one ends of the second low-pressure ball valve and the second solenoid valve. The other ends of the second low-pressure ball valve and the second solenoid valve are both connected to the helium recovery pump.

[0014] Furthermore, the first solenoid valve receives the signal from the first pressure sensor, and the second solenoid valve receives the signal from the third pressure sensor.

[0015] Furthermore, the valve low-temperature detection helium rapid recovery recycling device includes a temperature sensor, a medium-pressure valve, a third solenoid valve, a vaporization heat exchanger, a sixth pressure gauge, a fifth pressure sensor, a second safety relief valve, and a high-pressure gas storage tank; one end of the first high-pressure needle valve is respectively connected to one end of the first temperature sensor, the first medium-pressure valve, and the second medium-pressure valve through a high-pressure hose. The other end of the first medium-pressure valve is connected to one end of the third solenoid valve. The other end of the second medium-pressure valve is respectively connected to the other end of the third solenoid valve and one end of the vaporization heat exchanger. The other end of the vaporization heat exchanger is connected to one end of the third medium-pressure valve. The other end of the third medium-pressure valve is connected to the high-pressure gas storage tank. A fourth medium-pressure valve and a fifth medium-pressure valve are provided on one side of the high-pressure gas storage tank. One end of the high-pressure gas storage tank is respectively connected to the second safety relief valve, the fifth pressure sensor, and one end of the sixth medium-pressure valve. The other end of the sixth medium-pressure valve is connected to the sixth pressure gauge. The other end of the high-pressure gas storage tank is respectively connected to one end of the seventh medium-pressure valve and the second temperature sensor. The second temperature sensor and the fifth pressure sensor transmit signals to the third solenoid valve. The other end of the seventh medium-pressure valve is connected to the other end of the fifth medium-pressure needle valve through a high-pressure hose.

[0016] The beneficial effects of the present invention are as follows: 1) The structure of the present invention is compact, movable freely, and convenient to use. The high-pressure gas supercharging and room-temperature helium gas recovery integrated device for valve leakage detection and the rapid recovery and recycling device of helium gas for valve low-temperature detection can be combined or used separately, and can quickly realize the detection function through the flexible connection of the communication serial port and the detachable high-pressure hose with the PLC program-controlled touch display upper computer monitoring system, avoiding the limitation of the test site and meeting the test requirements of multiple workstations in different test sites for valve high-temperature, low-temperature, fugitive, and high-pressure gas test items.

[0017] 2) The present invention has high integration, automation, and safety reliability. It adopts the combined technology of double pumps for gas supercharging and helium recovery, valve control, and program control automation, integrating manual / automatic switching and remote / local switching operations for high-pressure gas supercharging, automatic recovery and recycling of room-temperature / low-temperature / high-temperature helium gas, intelligent monitoring and control of temperature and pressure process parameters, and real-time monitoring design of safety pressure relief alarm during the helium recovery process. It solves the common problems existing in the prior art, such as insufficient pressure of high-pressure gas supercharging for valve leakage detection, low supercharging efficiency, immature helium recovery technology and less application during valve testing, resulting in a substantial increase in production costs, low automation degree of the supercharging and helium recovery device, and certain safety hazards during the recovery process. Through the helium recovery technology for valves, the development and production application of high-end valve products, such as LNG valves, petrochemical valves, nuclear power valves, and hydrogen valves, will be significantly reduced, contributing to the development of green and low-carbon industries and environmental protection.

[0018] 3) The present invention has high safety, is green, low-carbon, energy-saving, and environmentally friendly. For the design of low-temperature or high-temperature helium gas in valve testing, it adopts the technology of vaporization heat exchange for temperature recovery and transitional storage in a high-pressure gas storage tank to ensure the realization and safety of low-temperature or high-temperature helium gas recovery in valve testing. It not only significantly reduces the testing cost of low-temperature valves but also greatly contributes to the replacement of imported products with domestic ones for high-performance valve products of low-temperature valves.

[0019] 4) The present invention is exquisitely designed, has diverse functions, and high automation. Aiming at the contradiction between the diverse requirements for the driving mode of control valves used in industrial process control systems and the relatively single functions of signal controllers on the current market, the project intensively designs various functions such as DC point control / continous, AC point control / continous, DC 4 - 20mA point control / continous, and safety interlock control for petrochemical valves on the basis of high-pressure gas supercharging and automatic helium recovery of the device, meeting the driving control, opening and closing, and continuous cyclic operation requirements of control valves, realizing multiple functions in one device and replacing humans with machines, making the testing process more convenient, and significantly improving labor efficiency, testing accuracy, and safety.

[0020] 5) The operation of the present invention is convenient, the detection efficiency is high, and the function has strong expandability. A PLC-programmed touch display upper computer monitoring system is designed to collect the main parameters of the gas medium pressure and temperature, the operating state and the number of cycles of the control valve in the device in real time, form temperature and pressure characteristic curves, and have functions of automatic data storage, processing, report generation, data calling, historical data query, and real-time monitoring of safety pressure relief alarm. Interfaces for temperature and pressure monitoring of the valve body to be measured and some power supplies are reserved, and the device has good function extensibility. It can solve the problems of local and remote, manual and automatic, point control and continuous safe control of the valve leakage test process, high-pressure gas pressurization, and the centralized control and monitoring of multiple parameters such as temperature, pressure, and the operating cycle of the valve body to be measured during the temperature, pressure, and helium recovery processes at normal temperature / low temperature / high temperature, greatly improving the test efficiency and safety. Brief Description of the Drawings

[0021] Figure 1 It is a structural schematic diagram of an intelligent control device for valve leakage detection gas pressurization and automatic helium recovery and recycling.

[0022] 1 is a high-pressure gas pressurization and room-temperature helium recovery integrated device for valve leakage detection;

[0023] 1.1 is the fifth medium-pressure needle valve, 1.7 is the fourth medium-pressure needle valve, 1.10 is the third medium-pressure needle valve, 1.12 is the second medium-pressure needle valve, 1.15 is the first medium-pressure needle valve, 1.2 is the second high-pressure gas pressure reducing valve, 1.27 is the first high-pressure gas pressure reducing valve, 1.3 is the first gas filter, 1.21 is the second gas filter, 1.4 is the fourth pressure sensor, 1.8 is the third pressure sensor, 1.30 is the second pressure sensor, 1.35 is the first pressure sensor, 1.5 is the second one-way valve, 1.31 is the first one-way valve, 1.6 is the helium recovery pump, 1.9 is the third pressure gauge, 1.18 is the fifth pressure gauge, 1.23 is the fourth pressure gauge, 1.29 is the second pressure gauge, 1.34 is the first pressure gauge, 1.11 is the safety relief valve, 1.13 is the second gas cylinder group, 1.14 is the first gas cylinder group, 1.16 is the second low-pressure ball valve, 1.24 is the first low-pressure ball valve, 1.17 is the second solenoid valve, 1.25 is the first solenoid valve, 1.19 is the second driving gas pressure reducing valve, 1.22 is the first driving gas pressure reducing valve, 1.20 is the driving gas, 1.26 is the seventh high-pressure needle valve, 1.28 is the sixth high-pressure needle valve, 1.33 is the fifth high-pressure needle valve, 1.36 is the third high-pressure needle valve, 1.37 is the second high-pressure needle valve, 1.38 is the first high-pressure needle valve, 1.39 is the fourth high-pressure needle valve, 1.32 is the gas pressurization pump, 1.40 is the valve body to be measured;

[0024] 2 is a device for rapid recovery and recycling of low-temperature helium for valve detection;

[0025] 2.1 is the first temperature sensor, 2.14 is the second temperature sensor, 2.2 is the first medium-pressure valve, 2.4 is the second medium-pressure valve, 2.6 is the third medium-pressure valve, 2.7 is the sixth medium-pressure valve, 2.12 is the fourth medium-pressure valve, 2.13 is the fifth medium-pressure valve, 2.15 is the seventh medium-pressure valve, 2.3 is the third solenoid valve, 2.5 is the vaporization heat exchanger, 2.8 is the sixth pressure gauge, 2.9 is the fifth pressure sensor, 2.10 is the second safety relief valve, 2.11 is the high-pressure gas storage tank;

[0026] 3-PLC programmable control touch display upper computer monitoring system. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0028] Embodiment 1 in combination with the attached Figure 1 A smart control device for valve leakage detection gas pressurization and automatic helium recovery, recycling and reuse, including a valve leakage detection high-pressure gas pressurization and room-temperature helium recovery integrated device 1, a valve low-temperature detection helium rapid recovery, recycling and reuse device 2, and a PLC programmable control touch display upper computer monitoring system 3. The valve low-temperature detection helium rapid recovery, recycling and reuse device is connected to the valve leakage detection high-pressure gas pressurization and room-temperature helium recovery integrated device through a high-pressure hose. The PLC programmable control touch display upper computer monitoring system is communicatively connected to the valve leakage detection high-pressure gas pressurization and room-temperature helium recovery integrated device and the valve low-temperature detection helium rapid recovery, recycling and reuse device.

[0029] A smart control device for valve leakage detection gas pressurization and automatic helium recovery, recycling and reuse. One end of the valve body 1.40 to be measured is connected to one end of the valve leakage detection high-pressure gas pressurization and room-temperature helium recovery integrated device 1 and the valve low-temperature detection helium rapid recovery, recycling and reuse device 2 through a high-pressure hose.

[0030] A valve leakage detection gas boosting and helium automatic recovery and recycling intelligent control device, the valve leakage detection high-pressure gas boosting and room temperature helium recovery integrated device 1 includes a medium-pressure needle valve, a high-pressure gas pressure reducing valve, a gas filter, a pressure sensor, a one-way valve, a helium recovery pump, a pressure gauge, a safety relief valve, a gas cylinder group, a low-pressure ball valve, a solenoid valve, a driving gas pressure reducing valve, a driving gas, a high-pressure needle valve, and a gas booster pump; one end of the first high-pressure needle valve 1.38 is connected to the valve low-temperature detection helium rapid recovery and recycling device 2 through a high-pressure hose, and the other end of the first high-pressure needle valve is connected to the second high-pressure needle valve 1.3. 7. The third high-pressure needle valve 1.36, the fourth high-pressure needle valve 1.39 and one end of the valve body 1.40 to be tested; the other end of the third high-pressure needle valve 1.36 is respectively connected to the two air outlets of the air booster pump 1.32, the first pressure sensor 1.35 and one end of the fifth high-pressure needle valve 1.33, and the other end of the fifth high-pressure needle valve is connected to the first pressure gauge 1.34; the two air inlets of the air booster pump 1.32 are respectively connected to the second pressure sensor 1.30, the sixth high-pressure needle valve 1.28 and one end of the first high-pressure air pressure reducing valve 1.27 after being collected through a pipeline, and the other end of the sixth high-pressure needle valve is connected to The second pressure gauge 1.29, the other end of the first high-pressure gas reducing valve 1.27 is connected to one end of the seventh high-pressure needle valve 1.26, the other end of the seventh high-pressure needle valve is respectively connected to a gas cylinder group 1.14 and one end of the first medium-pressure needle valve 1.15, the other end of the first medium-pressure needle valve is respectively connected to another gas cylinder group 1.13, the second medium-pressure needle valve 1.12, the third medium-pressure needle valve 1.10, the fourth medium-pressure needle valve and one end of the third pressure sensor 1.8, the other end of the second medium-pressure needle valve 1.12 is connected to the safety relief valve 1.11, the other end of the third medium-pressure needle valve 1.10 is respectively connected to the third The pressure gauge 1.9, the other end of the fourth medium-pressure needle valve 1.7 is connected to the two outlets of the helium recovery pump 1.6, the two air inlets of the helium recovery pump are brought together through pipelines and respectively connected to the fourth pressure sensor 1.4 and one end of the first air filter 1.3, the other end of the first air filter is connected to one end of the second high-pressure gas reducing valve 1.2, the other end of the second high-pressure gas reducing valve is respectively connected to the other end of the fourth high-pressure needle valve 1.39 and one end of the fifth medium-pressure needle valve 1.1, the other end of the fifth medium-pressure needle valve 1.1 is connected to the valve low-temperature detection helium rapid recovery and recycling device 2 through a high-pressure hose.

[0031] A valve leakage detection gas boosting and helium automatic recovery and recycling intelligent control device, the two gas outlets and two gas inlets of the gas boosting pump 1.32 are each provided with a first non-return valve 1.31; the two gas outlets and two gas inlets of the helium recovery pump 1.6 are each provided with a second non-return valve 1.5.

[0032] An intelligent control device for gas pressurization and automatic helium recovery, recycling and reuse in valve leakage detection. The gas booster pump is connected to one end of the first low-pressure ball valve 1.24 and the first solenoid valve 1.25. The other ends of the first low-pressure ball valve and the first solenoid valve are both connected to one end of the first driving gas pressure reducing valve 1.22. A fourth pressure gauge 1.23 is also provided between the first driving gas pressure reducing valve and one ends of the first low-pressure ball valve and the first solenoid valve. The other end of the first driving gas pressure reducing valve is respectively connected to one end of the second gas filter 1.21 and the second driving gas pressure reducing valve 1.19. The other end of the second gas filter is connected to the driving gas 1.20. The other end of the second driving gas pressure reducing valve is respectively connected to one end of the second low-pressure ball valve 1.16 and the second solenoid valve 1.17. A fifth pressure gauge 1.18 is also provided between the other end of the second driving gas pressure reducing valve and one ends of the second low-pressure ball valve and the second solenoid valve. The other ends of the second low-pressure ball valve and the second solenoid valve are both connected to the helium recovery pump 1.6.

[0033] An intelligent control device for gas pressurization and automatic helium recovery, recycling and reuse in valve leakage detection. The first solenoid valve 1.25 receives the signal from the first pressure sensor 1.35, and the second solenoid valve 1.17 receives the signal from the third pressure sensor 1.8.

[0034] An intelligent control device for gas pressurization and automatic helium recovery, recycling and reuse in valve leakage detection. The valve low-temperature detection helium rapid recovery, recycling and reuse device includes a temperature sensor, a medium-pressure valve, a third solenoid valve, a vaporization heat exchanger, a sixth pressure gauge, a fifth pressure sensor, a second safety relief valve, and a high-pressure gas storage tank. One end of the first high-pressure needle valve 1.38 is respectively connected to one end of the first temperature sensor 2.1, the first medium-pressure valve 2.2, and the second medium-pressure valve 2.4 through a high-pressure hose. The other end of the first medium-pressure valve 2.2 is connected to one end of the third solenoid valve 2.3. The other end of the second medium-pressure valve 2.4 is respectively connected to the other end of the third solenoid valve 2.3 and one end of the vaporization heat exchanger 2.5. The other end of the vaporization heat exchanger is connected to one end of the third medium-pressure valve 2.6. The other end of the third medium-pressure valve is connected to the high-pressure gas storage tank 2.11. A fourth medium-pressure valve 2.12 and a fifth medium-pressure valve 2.13 are provided on one side of the high-pressure gas storage tank. One end of the high-pressure gas storage tank is respectively connected to one end of the second safety relief valve 2.10, the fifth pressure sensor 2.9, and the sixth medium-pressure valve 2.7. The other end of the sixth medium-pressure valve is connected to the sixth pressure gauge 2.8. The other end of the high-pressure gas storage tank 2.11 is respectively connected to one end of the seventh medium-pressure valve 2.15 and the second temperature sensor 2.14. The second temperature sensor 2.14 and the fifth pressure sensor 2.9 transmit signals to the third solenoid valve 2.3. The other end of the seventh medium-pressure valve 2.15 is connected to the other end of the fifth medium-pressure needle valve 1.1 through a high-pressure hose.

[0035] An intelligent control device for valve leakage detection gas pressurization and helium automatic recovery, recycling and reuse. The PLC programmed touch display upper computer monitoring system 3 includes a movable electrical cabinet, a PLC, a touch screen, a dedicated test software, an industrial process control valve drive signal system and electrical components, all of which are integrally arranged in the movable electrical cabinet and form a communication connection with the pressure sensors, solenoid valves, temperature sensors, gas booster pumps, helium recovery pumps and the valve body to be measured in the high-pressure gas pressurization and room-temperature helium recovery integrated device for valve leakage detection and the rapid recovery, recycling and reuse device for low-temperature helium detection of valves. It realizes the automatic control of the gas pressurization circuit, the room-temperature helium recovery circuit, the low-temperature helium recovery, recycling and reuse circuit and the operation cycle of the industrial process control valve to be measured, and real-time collects the main parameters such as the pressure and temperature of the gas medium in the device, the operation state and the number of cycles of the control valve, forms the temperature and pressure characteristic curves, and has functions of automatic data storage, processing, report generation, data calling, historical data query and real-time monitoring of safety pressure relief alarm. It reserves the temperature and pressure monitoring of the valve body to be measured and some power supply related interfaces.

[0036] Medium-pressure needle valves are respectively used to control the inlet and outlet gas of the helium recovery pump, the switch and protection of the pressure gauge and safety valve in the helium recovery circuit, and the switching between gas cylinder groups.

[0037] High-pressure gas pressure reducing valves are respectively used for pressure reduction during helium recovery and pressure reduction after the gas cylinder group supplies gas during the gas pressurization process.

[0038] Gas filters are respectively used for recovering gas filtration, filtering the driving gas source, removing impurities and moisture.

[0039] The pressure sensors are respectively used to monitor the pressure at the inlet and outlet ends of the helium recovery pump and the gas booster pump in real time.

[0040] The check valves are used to protect the helium recovery pump and the gas booster pump to prevent gas backflow.

[0041] The helium recovery pump is used for helium recovery and pressurization.

[0042] The pressure gauges are installed at the rear end of the helium recovery pump for on-site observation of the pressure after helium recovery and pressurization, installed at the rear end of the driving gas pressure reducing valve for monitoring the pressure of the driving gas for driving the helium recovery pump and the gas booster pump, and installed at the front and rear ends of the gas booster pump for on-site observation of the pressure of the test gas before and after pressurization in the gas pressurization circuit.

[0043] The safety relief valve is used for overpressure protection, and a medium-pressure needle valve is arranged at its front end for the protection and maintenance of the safety relief valve.

[0044] The gas cylinder group is provided with a gas supply cylinder group and a recovery and storage cylinder group. A first medium-pressure needle valve is set between the gas supply cylinder group and the recovery and storage cylinder group as a switching valve to realize the functional interchange between the gas supply cylinder group and the recovery and storage cylinder group, meeting the requirements during the process of helium recovery and recycling.

[0045] The low-pressure ball valve is respectively installed on the parallel return circuit of the solenoid valves at the driving gas inlet ends of the helium recovery pump and the gas booster pump, realizing the manual and automatic switching functions of the operation of the helium recovery pump and the gas booster pump, and playing a protective role for the solenoid valves.

[0046] The solenoid valve is installed in the parallel return circuit of the above-mentioned low-pressure ball valve.

[0047] The driving gas pressure reducing valve is used to adjust the driving gas pressure of the helium recovery pump and the gas booster pump.

[0048] The high-pressure needle valve is used to control the flow and cut-off of the gas medium in the gas boosting circuit, protect the pressure gauge, release pressure, connect and disconnect with the room-temperature helium recovery circuit, and connect and disconnect with the valve low-temperature test helium rapid recovery and recycling device.

[0049] The gas booster pump is used for the pressurization and pressure stabilization of the test gas medium.

[0050] The temperature sensor is installed at the inlet end of the valve low-temperature detection helium rapid recovery and recycling device and the outlet end of the high-pressure gas storage tank, used to monitor in real time the temperature of the low-temperature helium at the outlet end of the measured valve body during the low-temperature helium recovery process and the temperature of the gas medium after being processed by the vaporization heat exchanger, ensuring the safety of the helium recovery process and avoiding the danger of out-of-control gas expansion and pressurization during the process of low-temperature helium rewarming.

[0051] The medium-pressure valve is installed at the inlet end and outlet end of the vaporization heat exchanger, the bypass pipeline and the outlet end of the high-pressure gas storage tank, used to control the on-off of the inlet and outlet gas of the valve low-temperature detection helium rapid recovery and recycling device, the on-off of the gas between the vaporization heat exchanger and the high-pressure gas storage tank, as well as the on-off control, pressure release, drainage, and on-off control and protection of the pressure gauge of the high-pressure gas storage tank.

[0052] The third solenoid valve is installed at the front end of the vaporization heat exchanger, forming a parallel circuit with the medium-pressure valve, realizing the manual and automatic on-off gas switching control of the vaporization heat exchanger, and a medium-pressure valve is set in front of the solenoid valve to protect this circuit in case of leakage of the solenoid valve.

[0053] The vaporization heat exchanger is used for the vaporization heat exchange of the valve-detected low-temperature helium to restore the low-temperature helium to room temperature, ensuring the safety of the helium recovery process.

[0054] The sixth pressure gauge and the fifth pressure sensor are installed on the high-pressure gas storage tank for local and remote detection of the gas pressure in the high-pressure gas storage tank;

[0055] The second safety relief valve is installed on the high-pressure gas storage tank for overpressure safety protection of the high-pressure gas storage tank;

[0056] The high-pressure gas storage tank is installed at the rear end of the vaporization heat exchanger for transitional storage and pressure stabilization of the gas after the low-temperature helium gas is processed by the vaporization heat exchanger.

[0057] An intelligent control device for valve leakage detection gas pressurization and automatic helium recovery, recycling and reuse solves the common technical problems in the valve industry such as the inability to recover helium gas or low recovery efficiency after helium leak detection in the key indicators of valve fugitive leakage testing and low-temperature testing, especially the large waste and significant increase in cost caused by the inability to recover helium gas after valve low-temperature testing, as well as low gas pressurization efficiency and low degree of automation, potential safety hazards in low-temperature helium gas recovery, low recovery efficiency, and low degree of automation of the device (such as the diverse signals for driving valve actions requiring a large number of miscellaneous instruments or devices, and the inability to automatically record temperature / pressure sensing and monitoring).

[0058] It realizes functions such as gas pressurization in the valve leakage detection process, helium gas recovery / storage / circulation use in normal-temperature / low-temperature / high-temperature helium leak detection processes, driving control signals for various industrial process control valves, automatic temperature monitoring in the valve high-low temperature testing process, automatic pressure monitoring in the testing process, and automatic monitoring of helium gas recovery, forming an intensive, intelligent, and automated device reaching the international advanced technical level. This invention can greatly improve the equipment safety and product detection efficiency, significantly reduce the device investment cost to achieve domestic independent research and development, realize energy conservation and environmental protection in the valve fugitive testing and valve low-temperature testing processes and greatly reduce the overall product development cost, contribute to the breakthrough of research and technology bottlenecks for low-fugitive valves, low-temperature valves, high-reliability high-condition valves, and high-performance valves, and will boost the deeper transformation and upgrading development and technological progress of the valve industry. The development of the helium gas recovery and recycling technology in the valve low-temperature testing process fills the domestic gap and realizes energy conservation and environmental protection.

[0059] An intelligent control device for valve leakage detection gas pressurization and automatic helium recovery, recycling and reuse. The valve leakage detection high-pressure gas pressurization and room-temperature helium gas recovery integrated device 1 is integrally placed on a mobile console, achieving a compact overall structure and connecting and communicating with the PLC program-controlled touch display upper computer monitoring system 3 through a communication serial port, mainly realizing the integrated automation control and real-time data monitoring of the gas pressurization and room-temperature helium gas recovery and recycling process and detection in the valve leakage detection process. During testing, the valve body under test 1.40 is connected to the valve leakage detection high-pressure gas pressurization and room-temperature helium gas recovery integrated device 1 through a high-pressure hose.

[0060] The gas cylinder group 1.14, high-pressure needle valves 1.26, 1.28, 1.33, 1.36, 1.37, 1.38, 1.39, high-pressure gas pressure reducing valve 1.27, pressure gauges 1.29, 1.34, pressure sensors 1.30, 1.35, check valve 1.31, gas booster pump 1.32 and the "gas booster pump drive control branch" constitute the "valve leakage detection gas booster circuit". The inlet end of the gas booster pump 1.32 is successively provided with the gas cylinder group 1.14, high-pressure needle valve 1.26, high-pressure gas pressure reducing valve 1.27, and a pressure detection branch (including high-pressure needle valve 1.28, pressure gauge 1.29 and pressure sensor 1.30), which are respectively used for the supply of test gas, the on-off control of the gas path, the pressure reduction adjustment of the gas supplied by the gas cylinder group, and the local and remote observation and monitoring of the test gas pressure before gas boosting. The outlet end of the gas booster pump 1.32 is successively provided with a pressure detection branch (including high-pressure needle valve 1.33, pressure gauge 1.34 and pressure sensor 1.35), high-pressure needle valves 1.36, 1.37, 1.38, 1.39, which are respectively used for the local and remote observation and monitoring of the test gas pressure after boosting, the on-off control of the gas path and pressure relief. In addition to real-time remote monitoring of the test gas pressure, the pressure sensor 1.35 can monitor the system 3 of the PLC program control touch display upper computer by feeding back the test pressure, and output a control signal to the solenoid valve 1.25 to realize the operation state control of the booster pump 1.32, so as to achieve the functions of automatically setting the pressure for boosting and automatic pressure compensation and avoiding overpressure. The check valve 1.31, with several in number, is arranged close to the inlet and outlet ends of the gas booster pump 1.32 to prevent the danger of high-pressure gas backflow. The driving gas 1.20, gas filter 1.21, driving gas pressure reducing valve 1.22, pressure gauge 1.23, low-pressure ball valve 1.24, solenoid valve 1.25 successively constitute the "gas booster pump drive control branch" of the gas booster pump 1.32, in which the low-pressure ball valve 1.24 and the solenoid valve 1.25 are installed in parallel to realize the manual and automatic switching boosting operation function of the gas booster pump 1.32. The "gas booster pump drive control branch" is connected to the gas booster pump 1.32 through a gas hose, which is used to control the boosting rate, start and stop of the gas booster pump 1.32.

[0061] The medium-pressure needle valves 1.1, 1.7, 1.10, 1.12, 1.15, the high-pressure gas pressure reducing valve 1.2, the gas filter 1.3, the pressure sensors 1.4, 1.8, the one-way valve 1.5, the helium recovery pump 1.6, the pressure gauge 1.9, the safety relief valve 1.11, the gas cylinder bank 1.13 and the helium recovery pump drive control branch form a "valve leakage detection room temperature helium recovery integrated circuit". The inlet end of the helium recovery pump 1.6 is successively provided with a medium-pressure needle valve 1.1, a high-pressure gas pressure reducing valve 1.2, a gas filter 1.3, and a pressure sensor 1.4, which are respectively used to control the on-off of the inlet air in the helium recovery circuit, reduce the pressure and adjust to meet the inlet pressure use requirements of the helium recovery pump 1.6, test the purification and filtration of the helium recovery, and monitor the inlet pressure of the helium recovery pump 1.6 in real time. The outlet end of the helium recovery pump 1.6 is successively provided with a medium-pressure needle valve 1.7, a pressure detection branch (including a pressure sensor 1.8, a pressure gauge 1.9, and a medium-pressure needle valve 1.10), a safety pressure relief branch (including a safety relief valve 1.11 and a medium-pressure needle valve 1.12) (the medium-pressure needle valve 1.12 is placed in front of the safety relief valve 1.11), and a gas cylinder bank 1.13, which are respectively used for controlling the on-off of the gas at the outlet of the helium recovery pump 1.6, observing the recovery pressure locally and monitoring remotely, automatically setting the pressure during the helium recovery process, automatically compensating the pressure and protecting against overpressure relief, and storing the recovered helium. In addition to remotely monitoring the pressure at the outlet of the helium recovery in real time, the pressure sensor 1.8 can feedback the test pressure to the PLC program-controlled touch display upper computer monitoring system 3, output a control signal to the solenoid valve 1.17, and realize the control of the operating state of the helium recovery pump 1.6, so as to achieve the functions of automatically setting the recovery pressure and automatically compensating the pressure and avoiding overpressure. The one-way valves 1.5, several in number, are installed next to the inlet and outlet ends of the helium recovery pump 1.6, and are used to ensure the forward flow of the recovered helium and prevent reverse flow. The drive gas 1.20, the gas filter 1.21, the drive gas pressure reducing valve 1.19, the pressure gauge 1.18, the low-pressure ball valve 1.16, and the solenoid valve 1.17 successively form the "helium recovery pump drive control branch" of the helium recovery pump 1.6. Among them, the low-pressure ball valve 1.16 and the solenoid valve 1.17 are installed in parallel to realize the manual and automatic switching of the helium recovery pump 1.6 and the function of helium recovery pressurized operation. The "helium recovery pump drive control branch" is connected to the helium recovery pump 1.6 through a gas hose, and is used to control the helium recovery pressurization rate, start and stop of the helium recovery pump 1.6.

[0062] The low-temperature helium rapid recovery, recycling and reuse device 2 for valve leakage detection includes temperature sensors 2.1 and 2.14, medium-pressure valves 2.2, 2.4, 2.6, 2.7, 2.12, 2.13, 2.15, solenoid valve 2.3, vaporization heat exchanger 2.5, pressure gauge 2.8, pressure sensor 2.9, safety relief valve 2.10, and high-pressure gas storage tank 2.11. The low-temperature helium rapid recovery, recycling and reuse device 2 for valve detection is integrally integrated on a mobile steel frame with a compact structure. It is connected and combined with the "room-temperature helium recovery integrated circuit for valve leakage detection" of the high-pressure gas boosting and room-temperature helium recovery integrated device 1 for valve leakage detection through a high-pressure hose to form a "low-temperature helium rapid recovery, recycling and reuse system circuit for valve detection". It is connected and communicated with the PLC program-controlled touch display upper computer monitoring system 3 through a communication serial port, mainly realizing the integrated automatic control of the low-temperature helium recovery, recycling and reuse process and the detection during valve leakage detection, as well as the real-time monitoring of temperature and pressure data. During testing, the valve body under test 1.40 is connected to the low-temperature helium rapid recovery, recycling and reuse device 2 for valve detection through a high-pressure hose and a high-pressure needle valve 1.38. After the low-temperature test of the valve, during the low-temperature helium recovery process, the low-temperature helium output by the valve body under test passes through the high-pressure needle valve 1.38 and the high-pressure heat-resistant hose, and then sequentially passes through the main circuit of the temperature sensor 2.1, vaporization heat exchanger 2.5, and high-pressure gas storage tank 2.11 for real-time temperature monitoring, low-temperature helium temperature recovery, and gas transition storage and pressure stabilization. Medium-pressure valves 2.4 and 2.6 are arranged at the front and rear ends of the vaporization heat exchanger 2.5, which are respectively used for controlling the gas flow and cutoff between the valve body under test 1.40 and the vaporization heat exchanger 2.5, and the gas on-off control between the vaporization heat exchanger 2.5 and the high-pressure gas storage tank 2.11. A medium-pressure valve 2.2 and a solenoid valve 2.3 are arranged on the parallel return circuit of the medium-pressure valve 2.4 at the front end of the vaporization heat exchanger 2.5, which are used for controlling the manual and automatic on-off control and protection of the low-temperature helium output by the valve body under test 1.40. The high-pressure gas storage tank 2.11 is installed at the rear end of the medium-pressure valve 2.6, and is equipped with medium-pressure valves 2.7, 2.12, 2.13, pressure gauge 2.8, pressure sensor 2.9, and safety relief valve 2.10. Among them, the medium-pressure valve 2.7 is used for connecting and disconnecting the pressure gauge 2.8, the medium-pressure valves 2.12 and 2.13 are respectively used for pressure relief and drainage of the high-pressure gas storage tank 2.11, the pressure gauge 2.8 is used for on-site monitoring of the pressure of the high-pressure gas storage tank 2.11, the pressure sensor 2.9 is used for remotely detecting the real-time pressure of the high-pressure gas storage tank 2.11 and realizing the control of the operating state of the solenoid valve 2.3 by feeding back the pressure signal to the PLC program-controlled touch display upper computer monitoring system 3, so as to achieve overpressure protection for the vaporization heat exchanger 2.5 and the high-pressure gas storage tank 2.11. The safety relief valve 2.10 is installed on the side or top of the high-pressure gas storage tank for overpressure relief protection of the high-pressure gas storage tank.The outlet end of the high-pressure gas storage tank 2.11 is equipped with a temperature sensor 2.14 to monitor the temperature of the helium gas processed by the vaporization heat exchanger 2.5 in the high-pressure gas storage tank 2.11, and feedback the temperature parameter to the PLC programmable touch display upper computer monitoring system 3 to conduct interlock control on the operating state of the solenoid valve 2.3, ensuring that the helium gas in the high-pressure gas storage tank 2.11 is restored to room temperature for safe recovery. The medium-pressure valve 2.15 is installed at the outlet end of the high-pressure gas storage tank 2.11, behind the temperature sensor 2.14, and is connected to the "valve leakage detection room temperature helium gas recovery integrated circuit" of the valve leakage detection high-pressure gas pressurization and room temperature helium gas recovery integrated device 1 through a high-pressure hose for controlling the on-off of the gas.

[0063] A valve leakage detection gas pressurization and helium gas automatic recovery, recycling and reuse intelligent control device includes three detection circuits: 1) a valve leakage detection gas pressurization circuit, 2) a valve leakage detection room temperature helium gas recovery integrated circuit, and 3) a valve leakage detection low-temperature helium gas rapid recovery, recycling and reuse system circuit. The opening and closing cycle drive control electrical signal of the valve body to be measured can be connected and controlled through the interface of the PLC programmable touch display upper computer monitoring system 3.

[0064] 1) The valve leakage detection gas boosting circuit consists of a gas cylinder group 1.14, high-pressure needle valves 1.26, 1.28, 1.33, 1.36, 1.37, 1.38, 1.39, a high-pressure gas pressure reducing valve 1.27, pressure gauges 1.29, 1.34, pressure sensors 1.30, 1.35, a check valve 1.31, a gas booster pump 1.32, and a "gas booster pump drive control branch" composed of a driving gas 1.20, a gas filter 1.21, a driving gas pressure reducing valve 1.22, a pressure gauge 1.23, a low-pressure ball valve 1.24, and a solenoid valve 1.25. When boosting the valve leakage detection gas, the valve body to be tested 1.40 is connected to the valve leakage detection gas boosting circuit through a high-pressure hose. The gas cylinder group 1.14 is opened, the high-pressure needle valves 1.26, 1.28, 1.33, 1.36 are opened, the high-pressure needle valves 1.37, 1.38, 1.39 are closed, the high-pressure gas pressure reducing valve 1.27 is opened and adjusted to the set pressure. In the "gas booster pump drive control branch", the driving gas 1.20 is opened for gas supply, and its filter 1.21 filters the driving gas to remove particulate impurities and moisture. The driving gas pressure reducing valve 1.22 is adjusted to the set pressure. When automatically boosting, the solenoid valve 1.25 is opened and the low-pressure ball valve 1.24 is closed to control the automatic boosting and pressure maintaining operation of the gas booster pump 1.32. When manually boosting, the low-pressure ball valve 1.24 is opened and the solenoid valve 1.24 is closed to control the manual boosting operation of the gas booster pump 1.32. During the process of boosting the valve leakage detection gas, the pressure sensors 1.30, 1.35, the solenoid valve 1.25 are kept in real-time connection with the PLC program-controlled touch display upper computer monitoring system 3, which is used to observe the change of pressure during the gas boosting process in real-time, control the pressure at a fixed point or continuously, provide overpressure protection, and perform pressure compensation. After the gas is boosted and the test pressure is stable, the gas cylinder group 1.14, the driving gas pressure reducing valve 1.22, the high-pressure needle valves 1.26, 1.28, 1.33, 1.36, the driving gas 1.20, the driving gas pressure reducing valve 2.22, the low-pressure ball valve 1.24, and the solenoid valve 1.25 are closed to stop the gas booster pump from working. After the valve leakage detection is completed, the high-pressure needle valve 1.39 is opened to connect the valve body to be tested 1.40 to the "room temperature helium gas recovery integrated circuit for valve leakage detection" to enter the room temperature helium gas recovery working link.

[0065] 2) The room-temperature helium recovery integrated circuit for valve leakage detection includes medium-pressure needle valves 1.1, 1.7, 1.10, 1.12, 1.15, a high-pressure gas pressure reducing valve 1.2, a gas filter 1.3, pressure sensors 1.4, 1.8, a check valve 1.5, a helium recovery pump 1.6, a pressure gauge 1.9, a safety relief valve 1.11, a gas cylinder group 1.13, and a "helium recovery pump drive control branch" composed of a drive gas 1.20, a gas filter 1.21, a drive gas pressure reducing valve 1.19, a pressure gauge 1.18, a low-pressure ball valve 1.16, and a solenoid valve 1.17. When recovering room-temperature helium for valve leakage detection, the valve body to be tested 1.40 is connected to the "room-temperature helium recovery integrated circuit for valve leakage detection" through a high-pressure hose and is installed at the front end of the high-pressure needle valve 1.39. The high-pressure needle valves 1.36 and 1.37 of the "room-temperature helium recovery integrated circuit for valve leakage detection" are closed, 1.39 is opened, the medium-pressure needle valves 1.1 and 1.15 are closed, 1.7, 1.9, and 1.12 are opened, the gas cylinder group 1.13 is opened, the high-pressure gas pressure reducing valve 1.2 is opened and adjusted to the recovery working pressure of the helium recovery pump, and the gas filter 1.3 is a normally open component. When automatically recovering and boosting pressure, the solenoid valve 1.17 is opened and the low-pressure ball valve 1.16 is closed to control the automatic recovery, boosting, and pressure maintaining operation of the helium recovery pump 1.6. When manually recovering and boosting pressure, the low-pressure ball valve 1.16 is opened and the solenoid valve 1.17 is closed to control the manual recovery and boosting operation of the gas boosting pump 1.6. The room-temperature helium is boosted by the helium recovery pump and then recovered to the gas cylinder group 1.13 for storage, for subsequent valve leakage testing. During the process of recovering room-temperature helium for valve leakage detection, the pressure sensors 1.4, 1.8, and the solenoid valve 1.17 are kept in real-time connection with the PLC program-controlled touch display upper computer monitoring system 3, which is used to observe the change of pressure during the room-temperature helium recovery and boosting process in real time, control the pressure at fixed points or continuously, provide overpressure protection, and perform pressure compensation. During the automatic recovery and boosting process, when the recovery and boosting overpressure occurs, the pressure sensor 1.8 will feedback an overpressure signal to the PLC program-controlled touch display upper computer monitoring system 3, causing the solenoid valve 1.17 to break and the helium recovery pump to stop the recovery and boosting work, and the safety relief valve 1.11 is opened for pressure relief, realizing double overpressure safety protection. After the room-temperature helium recovery for valve leakage detection is completed, the high-pressure needle valve 1.39 is closed, the medium-pressure needle valves 1.7, 1.9, and 1.12 are closed, it is ensured that the low-pressure ball valve 1.16 is in the closed state, the high-pressure needle valve 1.37 and the medium-pressure needle valve 1.1 are opened to discharge a little remaining gas in the valve body to be tested and the pipeline, and after emptying, the high-pressure needle valve 1.37 and the medium-pressure needle valve 1.1 are closed.

[0066] 3) The loop of the valve leakage detection low-temperature helium rapid recovery, recycling and reuse system includes the valve leakage detection low-temperature helium rapid recovery, recycling and reuse device 2 and the "room-temperature helium gas collection integrated loop for valve leakage detection". The valve leakage detection low-temperature helium rapid recovery, recycling and reuse device 2 consists of temperature sensors 2.1, 2.14, medium-pressure valves 2.2, 2.4, 2.6, 2.7, 2.12, 2.13, 2.15, solenoid valve 2.3, vaporization heat exchanger 2.5, pressure gauge 2.8, pressure sensor 2.9, safety relief valve 2.10, and high-pressure gas storage tank 2.11. The valve body under test 1.40 is connected to the front end of the high-pressure needle valve 1.38 through a high-pressure heat-resistant hose. The high-pressure needle valves 1.36, 1.37, 1.39 are closed and 1.38 is open. The inlet end of the valve leakage detection low-temperature helium rapid recovery, recycling and reuse device 2 is connected to the high-pressure needle valve 1.38 through a high-pressure heat-resistant hose, and the outlet end is connected to the medium-pressure needle valve 1.1 of the "room-temperature helium gas collection integrated loop for valve leakage detection" through a high-pressure hose. During the operation of the valve leakage detection low-temperature helium rapid recovery, recycling and reuse system, the medium-pressure valves 2.6, 2.7, 2.15 are open and 2.12, 2.13 are closed, and the vaporization heat exchanger 2.5 is open, enabling a manual or automatic low-temperature helium gas rewarming process: a) When rewarming manually, the medium-pressure valve 2.4 is open and 2.2 is closed. The low-temperature helium gas in the valve body under test 1.40 is processed by the vaporization heat exchanger 2.5 and then restored to be temporarily stored in the high-pressure gas storage tank 2.11. If overpressure occurs, the safety relief valve 2.10 will act to release the pressure; b) When rewarming automatically, the medium-pressure valve 2.4 is closed and 2.2 is open. The PLC programmed touch display upper computer monitoring system 3 drives the opening and closing of the solenoid valve 2.3 based on the feedback signals from the temperature sensors 2.1, 2.14 and the pressure sensor 2.9, automatically controlling the amount of low-temperature helium gas entering the vaporization heat exchanger 2.5, achieving automatic and precise control of the low-temperature helium gas rewarming speed and the temperature and pressure of the helium gas entering the high-pressure gas storage tank 2.11, and realizing double protection against overpressure with the safety relief valve 2.10. After the low-temperature test of the valve, the low-temperature helium gas output from the valve body under test has been restored to room temperature after the above-mentioned rewarming treatment by the valve leakage detection low-temperature helium rapid recovery, recycling and reuse device 2, and enters the room-temperature helium gas recovery and collection process. This process is the same as the description of the 2) room-temperature helium gas collection integrated loop for valve leakage detection. Finally, the low-temperature helium gas is recovered and stored in the gas cylinder group 1.13 for valve leakage detection. When conducting a valve leakage test, the medium-pressure needle valve 1.15 can be opened, and after the gas cylinder group 1.13 is pressurized by the 1) "gas pressurization loop for valve leakage detection", corresponding tests can be carried out on the valve body under test.

[0067] In summary, an intelligent control device for valve leakage detection gas pressurization and helium automatic recovery and recycling designs three circuits: a valve leakage detection gas pressurization circuit, a valve leakage detection room temperature helium recovery integrated circuit, and a valve leakage detection low-temperature helium rapid recovery and recycling system circuit. Through different combinations of the circuits, functions such as pressurization tests for helium or non-corrosive gases in valve leakage detection, recycling of room temperature test medium gases, and recycling of low-temperature test medium gases (helium) are achieved.

[0068] The connection interfaces for the opening and closing cycle drive control electrical signals of the valve body to be measured are mainly set on the side of the movable electrical cabinet and are controlled by the PLC program-controlled touch display upper computer monitoring system 3, mainly including DC24V point control and continuous cycle on-off counting, AC220V point control and continuous cycle on-off counting, (4 - 20)mA·DC break point and continuous cycle control counting, DC24V dual-channel alternating safety interlock break point and continuous cycle control counting, AC220V dual-channel alternating safety interlock break point and continuous cycle control counting, etc.

[0069] As mentioned above, only the specific preferred embodiments of the present invention are described, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. An intelligent control device for valve leakage detection gas pressurization and automatic helium recovery and recycling, comprising a valve leakage detection high-pressure gas pressurization and room-temperature helium collection integrated device, a valve low-temperature detection helium rapid recovery and recycling device, and a PLC programmed control touch display upper computer monitoring system, characterized in that: The valve low temperature detection helium rapid recovery and recycling device is connected with the valve leakage detection high pressure gas pressurization and room temperature helium recovery integrated device through a high pressure hose, and the PLC program-controlled touch display host computer monitoring system is connected with the valve leakage detection high pressure gas pressurization and room temperature helium recovery integrated device and the valve low temperature detection helium rapid recovery and recycling device through communication; One end of the valve body to be tested is connected to the valve leakage detection high-pressure gas boosting and room temperature helium recovery integrated device and the valve low-temperature detection helium rapid recovery and recycling device through a high-pressure hose; The valve leakage detection high-pressure gas boosting and room temperature helium recovery integrated device comprises a medium-pressure needle valve, a high-pressure gas pressure reducing valve, a gas filter, a pressure sensor, a one-way valve, a helium recovery pump, a pressure gauge, a safety relief valve, a gas cylinder group, a low-pressure ball valve, a solenoid valve, a driving gas pressure reducing valve, a driving gas, a high-pressure needle valve, and a gas boosting pump; one end of the first high-pressure needle valve is connected to the valve low-temperature detection helium rapid recovery and recycling device through a high-pressure hose, and the other end of the first high-pressure needle valve is respectively connected to the second high-pressure needle valve, the third high-pressure needle valve, the fourth high-pressure needle valve and one end of the valve body to be tested; the other end of the third high-pressure needle valve is respectively connected to the two air outlets of the gas boosting pump, the first pressure sensor and one end of the fifth high-pressure needle valve, and the other end of the fifth high-pressure needle valve is connected to the first pressure gauge; the two air inlets of the gas boosting pump are respectively connected to the second pressure sensor, the sixth high-pressure needle valve and one end of the first high-pressure gas pressure reducing valve after being collected through a pipeline, and the other end of the sixth high-pressure needle valve is connected to the second pressure sensor, the sixth high-pressure needle valve and one end of the first high-pressure gas pressure reducing valve. The other end of the first high-pressure gas reducing valve is connected to one end of the seventh high-pressure needle valve, the other end of the seventh high-pressure needle valve is respectively connected to a gas cylinder group and one end of the first medium-pressure needle valve, the other end of the first medium-pressure needle valve is respectively connected to another gas cylinder group, the second medium-pressure needle valve, the third medium-pressure needle valve, the fourth medium-pressure needle valve and one end of the third pressure sensor, the other end of the second medium-pressure needle valve is connected to the safety relief valve, the other end of the third medium-pressure needle valve is respectively connected to the third pressure gauge, the other end of the fourth medium-pressure needle valve is connected to the two outlets of the helium recovery pump, the two air inlets of the helium recovery pump are gathered together through pipelines and respectively connected to the fourth pressure sensor and one end of the first gas filter, the other end of the first gas filter is connected to one end of the second high-pressure gas reducing valve, the other end of the second high-pressure gas reducing valve is respectively connected to the other end of the fourth high-pressure needle valve and one end of the fifth medium-pressure needle valve, and the other end of the fifth medium-pressure needle valve is connected to the valve low-temperature detection helium rapid recovery and recycling device through a high-pressure hose.

2. The intelligent control device for valve leakage detection air pressurization and automatic helium recovery, recycling and reuse according to claim 1, characterized in that: A first one-way valve is provided at both the two gas outlets and the two gas inlets of the helium booster pump; a second one-way valve is provided at both the two gas outlets and the two gas inlets of the helium recovery pump.

3. An intelligent control device for valve leakage detection air pressurization and automatic helium recovery, recycling and reuse according to claim 2, characterized in that: The air booster pump is connected to the first low-pressure ball valve and one end of the first solenoid valve. The other ends of the first low-pressure ball valve and the first solenoid valve are both connected to one end of the first driving air pressure reducing valve. A fourth pressure gauge is also provided between the first driving air pressure reducing valve and one end of the first low-pressure ball valve and the first solenoid valve. The other end of the first driving air pressure reducing valve is respectively connected to one end of the second air filter and the second driving air pressure reducing valve. The other end of the second air filter is connected to the driving air. The other end of the second driving air pressure reducing valve is respectively connected to one end of the second low-pressure ball valve and the second solenoid valve. A fifth pressure gauge is also provided between the other end of the second driving air pressure reducing valve and one end of the second low-pressure ball valve and the second solenoid valve. The other ends of the second low-pressure ball valve and the second solenoid valve are both connected to the helium recovery pump.

4. An intelligent control device for valve leakage detection air pressurization and automatic helium recovery and recycling, according to claim 3, characterized in that: The first solenoid valve receives the signal from the first pressure sensor, and the second solenoid valve receives the signal from the third pressure sensor.

5. An intelligent control device for valve leakage detection gas supercharging and automatic helium recovery, recycling and reuse, according to claim 4, characterized in that: The valve low-temperature detection helium rapid recovery recycling device includes a temperature sensor, a medium-pressure valve, a third solenoid valve, a vaporization heat exchanger, a sixth pressure gauge, a fifth pressure sensor, a second safety relief valve, and a high-pressure gas storage tank. One end of the first high-pressure needle valve is respectively connected to the first temperature sensor, the first medium-pressure valve, and one end of the second medium-pressure valve through a high-pressure hose. The other end of the first medium-pressure valve is connected to one end of the third solenoid valve. The other end of the second medium-pressure valve is respectively connected to the other end of the third solenoid valve and one end of the vaporization heat exchanger. The other end of the vaporization heat exchanger is connected to one end of the third medium-pressure valve. The other end of the third medium-pressure valve is connected to the high-pressure gas storage tank. A fourth medium-pressure valve and a fifth medium-pressure valve are provided on one side of the high-pressure gas storage tank. One end of the high-pressure gas storage tank is respectively connected to the second safety relief valve, the fifth pressure sensor, and one end of the sixth medium-pressure valve. The other end of the sixth medium-pressure valve is connected to the sixth pressure gauge. The other end of the high-pressure gas storage tank is respectively connected to one end of the seventh medium-pressure valve and the second temperature sensor. The second temperature sensor and the fifth pressure sensor transmit signals to the third solenoid valve. The other end of the seventh medium-pressure valve is connected to the other end of the fifth medium-pressure needle valve through a high-pressure hose.

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