CN116858450B - Pressure-maintaining leakage-testing device and pressure-maintaining leakage-testing method for gas cylinder - Google Patents

Pressure-maintaining leakage-testing device and pressure-maintaining leakage-testing method for gas cylinder

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Publication number
CN116858450B
CN116858450B CN202311068265.0A CN202311068265A CN116858450B CN 116858450 B CN116858450 B CN 116858450B CN 202311068265 A CN202311068265 A CN 202311068265A CN 116858450 B CN116858450 B CN 116858450B
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China
Prior art keywords
pressure
pipeline
gas
valve
gas cylinder
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CN116858450A (en
Inventor
王文堂
李红芳
张秀蕊
刘莹
苏恒
陈文明
李学然
李永强
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Henan Xinlianxin Shenleng Energy Co ltd
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Henan Xinlianxin Shenleng Energy Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/32—Hydrogen storage

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  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

本发明涉及一种气瓶保压试漏装置及保压试漏方法；包括真空仓仓体，真空仓仓体内设有保压管道；真空仓仓体设有抽真空装置、真空仓检测单元以及氦气填充管路部；保压管道设有若干个气瓶接头和管道压力传感器，真空仓仓体外部设有保压管道检测单元，保压管道还与非氦气惰性气体填充管路部相连；真空仓检测单元包括仓体压力传感器，及氧含量仪；保压管道检测单元包括管道抽真空装置和气体检测部；通过压力和/或气体成分检测分析的方式能够避免气瓶出现锈蚀造成气体污染的现象，同时能够降低检测人员的操作难度，降低误判风险，具有检测准确率高以及能够对气瓶的气密性进行检测的特点。

The present invention relates to a gas cylinder pressure-maintaining leak testing device and a pressure-maintaining leak testing method; the device comprises a vacuum chamber body, wherein a pressure-maintaining pipeline is provided inside the vacuum chamber body; the vacuum chamber body is provided with a vacuum pumping device, a vacuum chamber detection unit and a helium filling pipeline portion; the pressure-maintaining pipeline is provided with a plurality of gas cylinder joints and pipeline pressure sensors, a pressure-maintaining pipeline detection unit is provided outside the vacuum chamber body, and the pressure-maintaining pipeline is also connected to the non-helium inert gas filling pipeline portion; the vacuum chamber detection unit comprises a chamber body pressure sensor and an oxygen content meter; the pressure-maintaining pipeline detection unit comprises a pipeline vacuum pumping device and a gas detection portion; the device can avoid gas pollution caused by rust of the gas cylinder by means of pressure and/or gas composition detection and analysis, and at the same time can reduce the operating difficulty of the detection personnel and the risk of misjudgment, and has the characteristics of high detection accuracy and the ability to detect the air tightness of the gas cylinder.

Description

Pressure-maintaining leakage-testing device and pressure-maintaining leakage-testing method for gas cylinder
Technical Field
The invention relates to the technical field of gas cylinder detection, in particular to a gas cylinder pressure maintaining leakage testing device and a pressure maintaining leakage testing method.
Background
The prior gas cylinder leakage test mainly relies on manual leakage test liquid for leakage test, and has the defects that 1, when leakage test liquid is adopted for leakage test, the effect is obvious when a gas cylinder is leaked greatly, when a trace leakage condition occurs, the leakage test liquid cannot be checked, when the gas cylinder is transported for a long distance after being filled, the problem of large leakage of product gas in the gas cylinder occurs, huge property loss is caused for a gas cylinder using unit, meanwhile, the problem of environmental pollution is caused when the gas cylinder gas belongs to gas which is forbidden to be discharged, 2, when a large quantity of gas cylinders need to be detected, the price of the leakage test liquid is relatively high, the leakage test liquid has risks of corrosion and gas pollution on the gas cylinder, the problems of high detection cost, influence on the service life of the gas cylinder and the non-standard of the product gas are caused, especially, when the gas cylinder is filled with an electronic grade, the pollution is caused in the gas cylinder, and 3, the leakage test process has special requirements for staff, especially the defects of influence on the skill, environment judgment, serious error and inconsistent results are caused in the process of leakage test staff.
Disclosure of Invention
The invention aims to provide a pressure maintaining leakage testing device and a pressure maintaining leakage testing method for a gas cylinder, so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The gas cylinder pressure-maintaining leakage-testing device comprises a vacuum bin body, wherein a pressure-maintaining pipeline is arranged in the vacuum bin body, the vacuum bin body is provided with a vacuumizing device, a vacuum bin detecting unit and a helium filling pipeline part, the pressure-maintaining pipeline is provided with a plurality of gas cylinder joints and a pipeline pressure sensor, the pressure-maintaining pipeline detecting unit is arranged outside the vacuum bin body and is also connected with a non-helium inert gas filling pipeline part, the vacuum bin detecting unit comprises a bin body pressure sensor for detecting the internal pressure of the vacuum bin body and an oxygen content meter for detecting the oxygen content in the vacuum bin body, and the pressure-maintaining pipeline detecting unit at least comprises a pipeline vacuumizing device for vacuumizing the pressure-maintaining pipeline and a gas detecting part for detecting whether other gases leak into the pressure-maintaining pipeline.
The invention has the beneficial effects that the vacuum bin body provided with the pressure maintaining pipeline is used as one container, the pressure maintaining pipeline is used as the other container, the leakage condition and the air tightness of the air cylinder are detected and analyzed through pressure detection and/or gas component detection and analysis by the air cylinder and the pressure maintaining pipeline, the leakage condition of the air cylinder is the damage of the air cylinder valve, the air tightness of the air cylinder is mainly micro leakage, the micro leakage is mainly found to be mainly from the screw thread of the air cylinder valve through research, and further, the invention can realize the batch detection of the air cylinder by arranging a plurality of air cylinder joints so as to achieve the purposes of improving the detection efficiency and reducing the detection cost, and meanwhile, the operation difficulty of detection personnel can be reduced, the misjudgment risk is reduced, and the air tightness of the air cylinder can be detected.
Preferably, the helium filling pipeline part comprises a helium bottle or a helium pipe network, the helium bottle or the helium pipe network is connected with the vacuum bin body through a pipeline, and a first pneumatic valve and a helium pressure sensor are arranged on the pipeline.
Preferably, the non-helium inert gas filling pipeline part comprises an inert gas cylinder or an inert gas pipe network, the inert gas cylinder or the inert gas pipe network is connected with the pressure maintaining pipeline through a pipeline, and a second pneumatic valve and an inert gas pressure sensor are arranged on the pipeline.
Preferably, the vacuum bin body is provided with a bin door with an electric control lock, and the vacuum bin body is provided with a ventilation pipeline with a ventilation motor.
Preferably, the pressure maintaining pipeline is connected with the pipeline vacuumizing device through a vacuumizing pipeline, a first tee joint, a second tee joint, a vacuum gauge for detecting the vacuum degree in the vacuumizing pipeline and a third pneumatic valve are sequentially arranged on the vacuumizing pipeline, and the gas detection part comprises a pumping type alarm connected with the third end of the first tee joint and a helium mass spectrum leak detector connected with the third end of the second tee joint.
Preferably, a fourth pneumatic valve is arranged between the third end of the first tee joint and the pumping type alarm instrument, and a fifth pneumatic valve is arranged between the third end of the second tee joint and the helium mass spectrometer leak detector.
The pressure maintaining pipeline is characterized by further comprising a PLC control system, wherein the signal input end of the PLC control system is respectively connected with a pipeline pressure sensor, a pipeline temperature sensor, a bin body pressure sensor, an oxygen content meter, a helium pressure sensor, an inert gas pressure sensor, a vacuum meter, a pumping type alarm and a helium mass spectrum leak detector, the signal output end of the PLC control system is respectively connected with a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a fifth pneumatic valve, a vacuumizing device, a vacuum meter and a pipeline vacuumizing device, and the pressure maintaining pipeline is further provided with the pipeline temperature sensor.
The pressure-maintaining leakage test method of the gas cylinder pressure-maintaining leakage test device comprises a positive pressure air tightness test of a cylinder valve interface, a negative pressure air tightness test of a cylinder valve interface, an alarm detection test and a helium mass spectrum leakage detector detection test, wherein the positive pressure air tightness test of the cylinder valve interface is used for detecting whether gas in a pressure-maintaining pipeline leaks into a vacuum bin body through a cylinder valve and whether gas in the gas cylinder enters the pressure-maintaining pipeline, the negative pressure air tightness test of the cylinder valve interface is used for detecting whether gas in the gas cylinder or the vacuum bin body enters the pressure-maintaining pipeline through the cylinder valve interface, the alarm detection test is used for detecting whether gas in the gas cylinder enters the pressure-maintaining pipeline through the cylinder valve interface, and the helium mass spectrum leakage detector detection test is used for detecting whether gas in the vacuum bin body leaks into the pressure-maintaining pipeline through the cylinder valve.
The method has the advantages that the method can be used in a crossed mode to improve the accuracy of pressure maintaining and leakage testing of the gas cylinder, the four methods can be used in all or at least one of the four methods can be selected for use, specifically, the positive pressure air tightness test of the interface of the gas cylinder valve is used for detecting whether the gas cylinder valve leaks and the air tightness, the negative pressure air tightness test of the interface of the gas cylinder valve is used for detecting whether the gas cylinder valve leaks and the air tightness, the detection test of the alarm instrument is mainly used for detecting whether the gas cylinder valve leaks, the detection test of the mass spectrum leak detector is mainly used for detecting the air tightness of the gas cylinder valve, batch operation can be carried out to detect the gas cylinder, when a batch has no problem, the whole batch can be judged to be qualified, and when the batch has the problem, the batch can be split and then detected respectively to achieve the purpose of determining the bottle valve with the specific problem. The mode can effectively improve the detection efficiency, and meanwhile, the detection accuracy is guaranteed.
Preferably, the positive pressure airtight test of the valve interface, the negative pressure airtight test of the valve interface, the detection test of the alarm instrument and the detection test of the helium mass spectrometer leak detector respectively comprise the following steps:
the positive pressure air tightness test of the bottle valve interface comprises the following steps:
step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint in a pressure maintaining pipeline;
step2, filling test gas into a pressure maintaining pipeline to ensure that the gas pressure in the pressure maintaining pipeline is higher than the pressure in a vacuum bin body and is lower than the pressure in a gas cylinder;
Detecting whether the pressure of the gas in the pressure maintaining pipeline fluctuates or not through a pipeline pressure sensor, when the pipeline pressure sensor detects that the pressure of the gas in the pressure maintaining pipeline is reduced, proving that the gas in the pressure maintaining pipeline leaks into a vacuum bin body through a bottle valve, namely the air tightness of the bottle valve is poor;
Step 4, after the detection is finished, recovering the test gas in the pressure maintaining pipeline, or vacuumizing by using a pipeline vacuumizing device;
The negative pressure air tightness test of the bottle valve interface comprises the following steps:
step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint in a pressure maintaining pipeline;
Step 2, opening a second pneumatic valve, enabling non-helium inert gas in an inert gas cylinder or an inert gas pipe network to enter a pressure maintaining pipeline for gas replacement, closing the second pneumatic valve after the replacement and releasing pressure, and finally vacuumizing the pressure maintaining pipeline by using a pipeline vacuumizing device and determining the vacuum degree in the pressure maintaining pipeline by using a vacuum gauge;
step 3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the gas cylinder is larger than the pressure in the vacuum chamber body, and the pressure in the vacuum chamber body is larger than the pressure in the pressure maintaining pipeline;
Step 4, detecting whether the pressure of the gas in the pressure maintaining pipeline rises through a pipeline pressure sensor, and when the pipeline pressure sensor detects that the pressure of the gas in the pressure maintaining pipeline rises, proving that the gas in the vacuum bin body or the gas bottle enters the pressure maintaining pipeline, namely, the condition that the gas bottle valve has leakage or poor air tightness;
When the pipeline pressure sensor detects that the pressure of the gas in the pressure maintaining pipeline is unchanged, the air tightness of the bottle valve is good, and the leakage phenomenon cannot occur;
The alarm detection test comprises the following steps:
step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint in a pressure maintaining pipeline;
step 2, opening a second pneumatic valve, enabling non-helium inert gas in an inert gas cylinder or an inert gas pipe network to enter a pressure maintaining pipeline for gas replacement, closing the second pneumatic valve after replacement and releasing pressure, so that the pressure in the pressure maintaining pipeline is consistent with the pressure in a vacuum bin body;
Step 3, the cylinder valve of the gas cylinder is in a closed state, and the pressure in the gas cylinder is greater than the pressure in the vacuum bin body;
step 4, the PLC control system controls the fourth pneumatic valve to be opened and starts the pumping type alarm, wherein the gas in the gas cylinder in the step 1 is consistent with the gas detected by the pumping type alarm;
Step 5, when the pumping type alarm detects the gas in the pressure maintaining pipeline, detecting that the gas in the pressure maintaining pipeline contains the gas component in the gas cylinder, and indicating that the gas cylinder valve has leakage;
detecting that the gas in the pressure maintaining pipeline does not contain the components of the gas in the gas cylinder, and indicating that the gas cylinder valve does not leak;
the helium mass spectrometer leak detector detection test comprises the following steps:
step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint in a pressure maintaining pipeline;
Step 2, starting a vacuumizing device, vacuumizing the vacuum bin body, closing the vacuumizing device when a preset vacuum value is reached, and opening a first pneumatic valve to enable helium in a helium bottle or a helium pipe network to enter the vacuum bin body;
step 3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the vacuum chamber body is larger than the pressure in the pressure maintaining pipeline, and the pressure in the vacuum chamber body is smaller than the pressure in the gas cylinder;
step 4, the PLC control system controls the fifth pneumatic valve to be opened, and the helium mass spectrometer leak detector is started;
Step 5, when the helium mass spectrometer leak detector detects the gas in the pressure maintaining pipeline, detecting that the gas in the pressure maintaining pipeline contains helium components, and indicating that the bottle valve has poor air tightness;
the gas in the detection pressure maintaining pipeline does not contain helium components, which indicates that the air tightness of the bottle valve is good.
Preferably, after the test is finished, when a person needs to enter, the ventilation motor is started, the oxygen content meter detects the oxygen content in the vacuum bin body in real time, and when the oxygen content reaches the human body entry standard, the bin door with the electric control lock is opened.
According to the invention, the vacuum bin body provided with the pressure maintaining pipeline is used as one container, the pressure maintaining pipeline is used as the other container, the gas cylinder and the pressure maintaining pipeline are positioned in the vacuum bin body, and the leakage condition and the air tightness of the gas cylinder are detected and analyzed through pressure detection and/or gas component detection, and the leakage condition of the gas cylinder is that the gas cylinder valve is damaged to cause large leakage, the air tightness of the gas cylinder is mainly micro leakage, and the micro leakage is found to be mainly from the thread of the gas cylinder valve.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a control schematic block diagram of the present invention.
In the figure, a vacuum bin body, a pressure maintaining pipeline, a vacuum pumping device, a 4-gas cylinder connector, a 5-pipeline pressure sensor, a 6-pipeline temperature sensor, a 7-bin body pressure sensor, an 8-oxygen content meter, a 9-pipeline vacuum pumping device, a 10-helium gas cylinder or helium pipe network, a 11-first pneumatic valve, a 12-helium gas pressure sensor, a 13-inert gas cylinder or inert gas pipe network, a 14-second pneumatic valve, a 15-inert gas pressure sensor, a 16-electric control lock, a 17-ventilation motor, a 18-first tee joint, a 19-second tee joint, a 20-vacuum gauge, a 21-third pneumatic valve, a 22-pumping type alarm, a 23-helium mass spectrometer, a 24-fourth pneumatic valve, a 25-fifth pneumatic valve and a 26-PLC control system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Referring to fig. 1-2, the invention discloses a gas cylinder pressure maintaining leakage testing device and a pressure maintaining leakage testing method, wherein the device comprises a vacuum bin body 1, a pressure maintaining pipeline 2 is arranged in the vacuum bin body 1, the vacuum bin body 1 is provided with a vacuumizing device 3, a vacuum bin detecting unit and a helium filling pipeline part, the pressure maintaining pipeline 2 is provided with a plurality of gas cylinder joints 4 and a pipeline pressure sensor 5, the outside of the vacuum bin body 1 is provided with a pressure maintaining pipeline detecting unit, the pressure maintaining pipeline 2 is also connected with a non-helium inert gas filling pipeline part, the vacuum bin detecting unit comprises a bin body pressure sensor 7 for detecting the internal pressure of the vacuum bin body 1 and an oxygen content meter 8 for detecting the internal oxygen content of the vacuum bin body 1, and the pressure maintaining pipeline detecting unit at least comprises a pipeline vacuumizing device 9 for vacuumizing the pressure maintaining pipeline 2 and a gas detecting part for detecting whether other gases are leaked into the pressure maintaining pipeline 2. The invention is suitable for detecting the gas cylinder, in particular for detecting the leakage condition and the air tightness of the gas cylinder, wherein the leakage condition of the gas cylinder refers to the occurrence of large-amplitude leakage caused by the damage of a cylinder valve, and the air tightness of the gas cylinder is mainly micro leakage; the invention uses the characteristic that the gas cylinder is connected with the pressure maintaining pipeline 2, and the gas cylinder and the pressure maintaining pipeline 2 are both positioned in the vacuum bin body 1, uses the pressure maintaining pipeline 2 and the vacuum bin body 1 as different cavities, and cooperates with pressure and/or gas component analysis to detect the leakage condition and the air tightness of the gas cylinder so as to achieve the purpose of improving the detection accuracy. It should be noted that the air tightness of the air cylinder cannot be effectively detected in a leakage test mode (the leakage amount of the leakage test liquid is small, the leakage state is not easy to find and observe in actual detection), but when the air tightness is poor, the product air in the air cylinder can be continuously leaked for a long time in the storage and transportation link or the storage link of the air cylinder, so that huge property loss is caused for the air cylinder using unit, meanwhile, leakage of a gas supplier in the transportation process is easy to be caused, cost is reduced, and the like are consistently plagued for a gas production enterprise. It should be noted that the invention is also provided with a pipeline temperature sensor 6 which can detect the temperature in the pressure maintaining pipeline 2, and the influence of the gas temperature on the gas pressure can be eliminated through conversion in the later period.
Further, the helium filling pipeline part comprises a helium bottle or a helium pipe network 10, the helium bottle or the helium pipe network 10 is connected with the vacuum bin body 1 through a pipeline, and a first pneumatic valve 11 and a helium pressure sensor 12 are arranged on the pipeline. Through the arrangement, helium in the helium bottle or the helium pipe network 10 can enter the vacuum bin body 1 so as to facilitate the purpose of later detection.
Further, the non-helium inert gas filling pipeline part comprises an inert gas cylinder or an inert gas pipe network 13, the inert gas cylinder or the inert gas pipe network 13 is connected with the pressure maintaining pipeline 2 through a pipeline, and a second pneumatic valve 14 and an inert gas pressure sensor 15 are arranged on the pipeline. Through the arrangement, non-helium inert gas can enter the pressure maintaining pipeline 2, later detection is facilitated, and meanwhile the non-helium inert gas can be distinguished from helium in the vacuum chamber body 1, wherein the non-helium inert gas can comprise neon, argon, krypton, xenon and the like.
Further, a bin door with an electric control lock 16 is arranged on the vacuum bin body 1, and a ventilation pipeline with a ventilation motor 17 is arranged on the vacuum bin body 1. The electric control lock 16 can be matched with the ventilation motor 17, namely, when a person enters the vacuum bin body 1, the ventilation motor 17 is started first, and when the vacuum bin body 1 and external air are in the same time, the electric control lock 16 is opened, so that the life safety of the person entering the site is ensured.
Further, the pressure maintaining pipeline 2 is connected with the pipeline vacuumizing device 9 through a vacuumizing pipeline, a first tee joint 18, a second tee joint 19, a vacuum gauge 20 for detecting the vacuum degree in the vacuumizing pipeline and a third pneumatic valve 21 are sequentially arranged on the vacuumizing pipeline, and the gas detection part comprises a pumping type alarm 22 connected with the third end of the first tee joint 18 and a helium mass spectrometer leak detector 23 connected with the third end of the second tee joint 19. The pumping type alarm device 22 can realize vacuumizing treatment on the pressure maintaining pipeline 2 and detection on the gas in the pressure maintaining pipeline 2, and the gas detector in the pumping type alarm device 22 is consistent with the product gas in the gas cylinder, for example, when the product gas in the gas cylinder is carbon monoxide, the pumping type alarm device 22 is a CO gas detector.
Further, a fourth pneumatic valve 24 is arranged between the third end of the first tee joint 18 and the pumping type alarm instrument 22, and a fifth pneumatic valve 25 is arranged between the third end of the second tee joint 19 and the helium mass spectrometer leak detector 23.
The invention further comprises a PLC control system 26, wherein the signal input end of the PLC control system 26 is respectively connected with a pipeline pressure sensor 5, a pipeline temperature sensor 6, a bin body pressure sensor 7, an oxygen content meter 8, a helium pressure sensor 12, an inert gas pressure sensor 15, a vacuum gauge 20, a pumping alarm 22 and a helium mass spectrum leak detector 23, the signal output end of the PLC control system 26 is respectively connected with a first pneumatic valve 11, a second pneumatic valve 14, a third pneumatic valve 21, a fourth pneumatic valve 24, a fifth pneumatic valve 25, a vacuumizing device 3, a vacuum gauge 20 and a pipeline vacuumizing device 9, and the pressure maintaining pipeline 2 is also provided with the pipeline temperature sensor 6.
The pressure-maintaining leakage test method of the gas cylinder pressure-maintaining leakage test device comprises a positive pressure airtight test of a cylinder valve interface, a negative pressure airtight test of a cylinder valve interface, an alarm detection test and a helium mass spectrum leakage detector detection test, wherein the positive pressure airtight test of the cylinder valve interface is used for detecting whether gas in a pressure-maintaining pipeline 2 leaks into a vacuum bin body 1 through a cylinder valve and whether gas in the gas cylinder enters the pressure-maintaining pipeline 2, the negative pressure airtight test of the cylinder valve interface is used for detecting whether gas in the gas cylinder or the vacuum bin body 1 enters the pressure-maintaining pipeline 2 through a cylinder valve interface, the alarm detection test is used for detecting whether gas in the gas cylinder enters the pressure-maintaining pipeline 2 through the cylinder valve interface, and the helium mass spectrum leakage detector detection test is used for detecting whether gas in the vacuum bin body 1 leaks into the pressure-maintaining pipeline 2 through a cylinder valve. The method can be used in a crossed manner to improve the accuracy of pressure maintaining leakage test of the gas cylinder, the four methods can be used in all or at least one of the four methods can be used, specifically, the positive pressure air tightness test of the interface of the gas cylinder is used for detecting whether the gas cylinder is leaked or not and the air tightness, the negative pressure air tightness test of the interface of the gas cylinder is used for detecting whether the gas cylinder is leaked or not (the detection method of the negative pressure air tightness test of the interface of the gas cylinder is the same as the detection method of the positive pressure air tightness test of the interface of the gas cylinder), the detection test of the alarm is mainly used for detecting whether the gas cylinder is leaked or not, the detection test of the helium mass spectrometer is mainly used for detecting the air tightness of the gas cylinder, the method can be used for carrying out batch operation on the gas cylinder, the whole batch is qualified when one batch is not problematic, the batch can be split and then be detected respectively to achieve the purpose of determining the bottle valve with specific problem. The mode can effectively improve the detection efficiency, and meanwhile, the detection accuracy is guaranteed.
Further, the positive pressure air tightness test of the valve interface, the negative pressure air tightness test of the valve interface, the detection test of the alarm instrument and the detection test of the helium mass spectrometer leak detector respectively comprise the following steps:
the positive pressure air tightness test of the bottle valve interface comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, filling test gas into the pressure maintaining pipeline 2, so that the gas pressure in the pressure maintaining pipeline 2 is higher than the pressure in the vacuum bin body 1 and is lower than the pressure in the gas cylinder;
Step 3, detecting whether the pressure of the gas in the pressure maintaining pipeline 2 fluctuates or not through the pipeline pressure sensor 5, when the pipeline pressure sensor 5 detects that the pressure of the gas in the pressure maintaining pipeline 2 is reduced, proving that the gas in the pressure maintaining pipeline 2 leaks into the vacuum bin body 1 through the bottle valve, namely the air tightness of the bottle valve is poor, when the pipeline pressure sensor 5 detects that the pressure of the gas in the pressure maintaining pipeline 2 is increased, proving that the gas in the gas bottle enters the pressure maintaining pipeline 2, namely the bottle valve is leaked, and when the pipeline pressure sensor 5 detects that the gas in the pressure maintaining pipeline 2 is not changed, proving that the air tightness of the bottle valve is good, and the leakage phenomenon cannot occur;
step 4, after the detection is finished, recovering the test gas in the pressure maintaining pipeline 2 or vacuumizing by using a pipeline vacuumizing device 9;
The negative pressure air tightness test of the bottle valve interface comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, opening a second pneumatic valve 14, enabling non-helium inert gas in an inert gas cylinder or an inert gas pipe network 13 to enter a pressure maintaining pipeline 2 for gas replacement, closing the second pneumatic valve 14 after the replacement and releasing pressure, and finally vacuumizing the pressure maintaining pipeline 2 by utilizing a pipeline vacuumizing device 9, and determining the vacuum degree in the pressure maintaining pipeline 2 by utilizing a vacuum gauge 20;
Step 3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the gas cylinder is larger than the pressure in the vacuum chamber body 1, and the pressure in the vacuum chamber body 1 is larger than the pressure in the pressure maintaining pipeline 2;
Step 4, detecting whether the pressure of the gas in the pressure maintaining pipeline 2 rises through the pipeline pressure sensor 5, and when the pipeline pressure sensor 5 detects that the pressure of the gas in the pressure maintaining pipeline 2 rises, proving that the gas in the vacuum bin body 1 or the gas cylinder enters the pressure maintaining pipeline 2, namely, the condition that the cylinder valve has leakage or poor air tightness;
When the pipeline pressure sensor 5 detects that the pressure of the gas in the pressure maintaining pipeline 2 is unchanged, the air tightness of the bottle valve is good, and the leakage phenomenon can not occur;
The alarm detection test comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, a second pneumatic valve 14 is opened, non-helium inert gas in an inert gas cylinder or an inert gas pipe network 13 enters a pressure maintaining pipeline 2 for gas replacement, and after replacement, the second pneumatic valve 14 is closed and pressure is released, so that the pressure in the pressure maintaining pipeline 2 is kept consistent with the pressure in a vacuum bin body 1;
step 3, the cylinder valve of the gas cylinder is in a closed state, and the pressure in the gas cylinder is higher than the pressure in the vacuum bin body 1;
Step 4, the PLC control system 26 controls the fourth pneumatic valve 24 to be opened and starts the pumping alarm device 22, wherein the gas in the gas cylinder in the step1 is consistent with the gas detected by the pumping alarm device 22;
step 5, when the pumping type alarm device 22 detects the gas in the pressure maintaining pipeline 2, detecting that the gas in the pressure maintaining pipeline 2 contains the gas component in the gas cylinder, and indicating that the leakage exists in the cylinder valve;
Detecting that the gas in the pressure maintaining pipeline 2 does not contain the gas component in the gas cylinder, and indicating that the gas cylinder valve does not leak;
the helium mass spectrometer leak detector detection test comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, starting a vacuumizing device 3, vacuumizing the vacuum bin body 1, closing the vacuumizing device 3 when a preset vacuum value is reached, and opening a first pneumatic valve 11 to enable helium in a helium bottle or a helium pipe network 10 to enter the vacuum bin body 1;
Step 3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the vacuum chamber body 1 is larger than the pressure in the pressure maintaining pipeline 2, and the pressure in the vacuum chamber body 1 is smaller than the pressure in the gas cylinder;
step 4, the PLC control system 26 controls the fifth pneumatic valve 25 to open, and starts the helium mass spectrometer leak detector 23;
step 5, when the helium mass spectrometer leak detector 23 detects the gas in the pressure maintaining pipeline 2, detecting that the gas in the pressure maintaining pipeline 2 contains helium components, and indicating that the bottle valve has poor air tightness;
The detection of the absence of helium in the gas in the holding pressure pipe 2 indicates that the cylinder valve has good air tightness.
When the invention is particularly used, the positive pressure air tightness test of the valve interface or the negative pressure air tightness test of the valve interface can be singly used, or the positive pressure air tightness test of the valve interface or the negative pressure air tightness test of the valve interface can be matched and cross-verified, or the negative pressure air tightness test of the valve interface is matched with the detection test of the alarm instrument, or the negative pressure air tightness test of the valve interface is matched with the detection test of the helium mass spectrometer leak detector, or the positive pressure air tightness test of the valve interface is matched with the detection test of the alarm instrument and the detection test of the helium mass spectrometer leak detector. It should be noted that the gas cylinder has different leakage and tightness standards, can be generally divided into 1.0X10 -7 mbar I/s, has leakage of more than 1.0X10 -7 mbar I/s, has poor tightness of 1.0X10 - 7 mbar I/s, and has unqualified gas tightness when the gas cylinder is in negative pressure tightness test, the gas cylinder can be matched with an alarm detection test and/or a helium mass spectrometer leak detector detection test to determine the specific leakage condition or tightness of the gas cylinder valve, and the gas cylinder valve can be maintained in a maintenance or replacement mode when the leakage condition occurs, and can be maintained for threads when the tightness problem occurs, so that the gas cylinder can be prevented from flowing into the market when the product gas is leaked.
Further, after the test is finished, when a person needs to enter, the ventilation motor 17 is started, the oxygen content meter 8 detects the oxygen content in the vacuum bin body 1 in real time, and when the oxygen content reaches the human body entry standard, the bin door with the electric lock 16 is opened. In order to ensure the safety of personnel entering the vacuum chamber body 1, before the personnel enter the vacuum chamber body 1, firstly, a ventilation motor 17 is started, an oxygen content meter 8 detects the oxygen content in the vacuum chamber body 1 when the ventilation motor 17 is started, and when the oxygen content meets the human body entering standard, an electric control lock 16 is opened, and the personnel enter the vacuum chamber body 1 through a chamber door to operate.
The invention will now be further described in connection with specific embodiments for a clearer explanation thereof. Specific examples are as follows:
example 1
The gas cylinder pressure-maintaining leakage-testing device comprises a vacuum bin body 1, wherein a pressure-maintaining pipeline 2 is arranged in the vacuum bin body 1, the vacuum bin body 1 is provided with a vacuumizing device 3, a vacuum bin detecting unit and a helium filling pipeline part, the pressure-maintaining pipeline 2 is provided with a plurality of gas cylinder joints 4 and pipeline pressure sensors 5, the pressure-maintaining pipeline detecting unit is arranged outside the vacuum bin body 1, the pressure-maintaining pipeline 2 is also connected with a non-helium inert gas filling pipeline part, the vacuum bin detecting unit comprises a bin body pressure sensor 7 for detecting the internal pressure of the vacuum bin body 1, and an oxygen content meter 8 for detecting the oxygen content in the vacuum bin body 1, and the pressure-maintaining pipeline detecting unit at least comprises a pipeline vacuumizing device 9 for vacuumizing the pressure-maintaining pipeline 2 and a gas detecting part for detecting whether other gases leak into the pressure-maintaining pipeline 2. The helium filling pipeline part comprises a helium bottle or a helium pipe network 10, the helium bottle or the helium pipe network 10 is connected with the vacuum bin body 1 through a pipeline, and a first pneumatic valve 11 and a helium pressure sensor 12 are arranged on the pipeline. The non-helium inert gas filling pipeline part comprises an inert gas cylinder or an inert gas pipeline network 13, the inert gas cylinder or the inert gas pipeline network 13 is connected with the pressure maintaining pipeline 2 through a pipeline, and a second pneumatic valve 14 and an inert gas pressure sensor 15 are arranged on the pipeline. The vacuum bin body 1 is provided with a bin door with an electric control lock 16, and the vacuum bin body 1 is provided with a ventilation pipeline with a ventilation motor 17. The pressure maintaining pipeline 2 is connected with the pipeline vacuumizing device 9 through a vacuumizing pipeline, a first tee joint 18, a second tee joint 19, a vacuum gauge 20 for detecting the vacuum degree in the vacuumizing pipeline and a third pneumatic valve 21 are sequentially arranged on the vacuumizing pipeline, and the gas detection part comprises a pumping type alarm 22 connected with the third end of the first tee joint 18 and a helium mass spectrum leak detector 23 connected with the third end of the second tee joint 19. A fourth pneumatic valve 24 is arranged between the third end of the first tee joint 18 and the pumping type alarm instrument 22, and a fifth pneumatic valve 25 is arranged between the third end of the second tee joint 19 and the helium mass spectrometer leak detector 23. The pressure maintaining pipeline 2 is further provided with a pipeline temperature sensor 6, wherein the signal input end of the PLC control system 26 is respectively connected with the pipeline pressure sensor 5, the pipeline temperature sensor 6, the bin body pressure sensor 7, the oxygen content meter 8, the helium pressure sensor 12, the inert gas pressure sensor 15, the vacuum gauge 20, the pumping type alarm 22 and the helium mass spectrum leak detector 23, and the signal output end of the PLC control system 26 is respectively connected with the first pneumatic valve 11, the second pneumatic valve 14, the third pneumatic valve 21, the fourth pneumatic valve 24, the fifth pneumatic valve 25, the vacuumizing device 3, the vacuum gauge 20 and the pipeline vacuumizing device 9.
A pressure-maintaining leakage-testing method of a pressure-maintaining leakage-testing device of a gas cylinder is a positive pressure air-tightness test of a valve interface of the gas cylinder, and comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, filling test gas into the pressure maintaining pipeline 2, so that the gas pressure in the pressure maintaining pipeline 2 is higher than the pressure in the vacuum bin body 1 and is lower than the pressure in the gas cylinder;
and 3, detecting whether the gas pressure in the pressure maintaining pipeline 2 fluctuates or not through the pipeline pressure sensor 5, and when the pipeline pressure sensor 5 detects that the gas pressure in the pressure maintaining pipeline 2 is reduced, proving that the gas in the pressure maintaining pipeline 2 leaks into the vacuum bin body 1 through the bottle valve, namely the air tightness of the bottle valve is poor, and checking and maintaining the air tightness of the bottle valve at the moment.
And 4, after the detection is finished, recovering the test gas in the pressure maintaining pipeline 2 or vacuumizing by using a pipeline vacuumizing device 9.
Example 2
The structure of the pressure-maintaining leakage-testing device for the gas cylinder is the same as that of the embodiment 1;
A pressure-maintaining leakage-testing method of a pressure-maintaining leakage-testing device of a gas cylinder is a positive pressure air-tightness test of a valve interface of the gas cylinder, and comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, filling test gas into the pressure maintaining pipeline 2, so that the gas pressure in the pressure maintaining pipeline 2 is higher than the pressure in the vacuum bin body 1 and is lower than the pressure in the gas cylinder;
And 3, detecting whether the pressure of the gas in the pressure maintaining pipeline 2 fluctuates or not through the pipeline pressure sensor 5, and when the pipeline pressure sensor 5 detects that the pressure of the gas in the pressure maintaining pipeline 2 rises, proving that the gas in the gas cylinder enters the pressure maintaining pipeline 2, namely, the condition that the cylinder valve leaks, and checking, maintaining or replacing the problem that the cylinder valve leaks.
And 4, after the detection is finished, recovering the test gas in the pressure maintaining pipeline 2 or vacuumizing by using a pipeline vacuumizing device 9.
Example 3
The structure of the pressure-maintaining leakage-testing device for the gas cylinder is the same as that of the embodiment 1;
A pressure-maintaining leakage-testing method of a pressure-maintaining leakage-testing device of a gas cylinder is a positive pressure air-tightness test of a valve interface of the gas cylinder, and comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, filling test gas into the pressure maintaining pipeline 2, so that the gas pressure in the pressure maintaining pipeline 2 is higher than the pressure in the vacuum bin body 1 and is lower than the pressure in the gas cylinder;
step 3, detecting whether the pressure of the gas in the pressure maintaining pipeline 2 fluctuates or not through the pipeline pressure sensor 5, and when the pipeline pressure sensor 5 detects that the gas in the pressure maintaining pipeline 2 does not change, proving that the air tightness of the bottle valve is good and the leakage phenomenon does not occur;
and 4, after the detection is finished, recovering the test gas in the pressure maintaining pipeline 2 or vacuumizing by using a pipeline vacuumizing device 9.
Example 4
The structure of the pressure-maintaining leakage-testing device for the gas cylinder is the same as that of the embodiment 1;
A pressure-maintaining leakage-testing method of a pressure-maintaining leakage-testing device of a gas cylinder comprises a positive pressure air tightness test of a valve interface of the gas cylinder and a negative pressure air tightness test of the valve interface of the gas cylinder;
the positive pressure air tightness test of the bottle valve interface comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, filling test gas into the pressure maintaining pipeline 2, so that the gas pressure in the pressure maintaining pipeline 2 is higher than the pressure in the vacuum bin body 1 and is lower than the pressure in the gas cylinder;
step 3, detecting whether the pressure of the gas in the pressure maintaining pipeline 2 fluctuates or not through the pipeline pressure sensor 5, and when the pipeline pressure sensor 5 detects that the gas in the pressure maintaining pipeline 2 does not change, proving that the air tightness of the bottle valve is good and the leakage phenomenon does not occur;
step 4, after the detection is finished, recovering the test gas in the pressure maintaining pipeline 2 or vacuumizing by using a pipeline vacuumizing device 9;
The negative pressure air tightness test of the bottle valve interface comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, opening a second pneumatic valve 14, enabling non-helium inert gas in an inert gas cylinder or an inert gas pipe network 13 to enter a pressure maintaining pipeline 2 for gas replacement, closing the second pneumatic valve 14 after the replacement and releasing pressure, and finally vacuumizing the pressure maintaining pipeline 2 by utilizing a pipeline vacuumizing device 9, and determining the vacuum degree in the pressure maintaining pipeline 2 by utilizing a vacuum gauge 20;
Step 3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the gas cylinder is larger than the pressure in the vacuum chamber body 1, and the pressure in the vacuum chamber body 1 is larger than the pressure in the pressure maintaining pipeline 2;
and 4, detecting whether the gas pressure in the pressure maintaining pipeline 2 rises or not through the pipeline pressure sensor 5, wherein when the pipeline pressure sensor 5 detects that the gas pressure in the pressure maintaining pipeline 2 is unchanged, the air tightness of the bottle valve is good, and the leakage phenomenon cannot occur.
The cross verification proves that the air tightness of the bottle valve is good, and the leakage phenomenon can not occur.
Example 5
The structure of the pressure-maintaining leakage-testing device for the gas cylinder is the same as that of the embodiment 1;
a pressure-maintaining leakage-testing method of a pressure-maintaining leakage-testing device of a gas cylinder comprises a positive pressure air tightness test of a valve interface of the gas cylinder, a negative pressure air tightness test of the valve interface of the gas cylinder and a detection test of an alarm;
the positive pressure air tightness test of the bottle valve interface comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, filling test gas into the pressure maintaining pipeline 2, so that the gas pressure in the pressure maintaining pipeline 2 is higher than the pressure in the vacuum bin body 1 and is lower than the pressure in the gas cylinder;
Step 3, detecting whether the gas pressure in the pressure maintaining pipeline 2 fluctuates or not through the pipeline pressure sensor 5, and when the pipeline pressure sensor 5 detects that the gas pressure in the pressure maintaining pipeline 2 rises, proving that the gas in the gas cylinder enters the pressure maintaining pipeline 2, namely, the condition that a cylinder valve leaks exists;
step 4, after the detection is finished, recovering the test gas in the pressure maintaining pipeline 2 or vacuumizing by using a pipeline vacuumizing device 9;
The negative pressure air tightness test of the bottle valve interface comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, opening a second pneumatic valve 14, enabling non-helium inert gas in an inert gas cylinder or an inert gas pipe network 13 to enter a pressure maintaining pipeline 2 for gas replacement, closing the second pneumatic valve 14 after the replacement and releasing pressure, and finally vacuumizing the pressure maintaining pipeline 2 by utilizing a pipeline vacuumizing device 9, and determining the vacuum degree in the pressure maintaining pipeline 2 by utilizing a vacuum gauge 20;
Step 3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the gas cylinder is larger than the pressure in the vacuum chamber body 1, and the pressure in the vacuum chamber body 1 is larger than the pressure in the pressure maintaining pipeline 2;
Step 4, detecting whether the pressure of the gas in the pressure maintaining pipeline 2 rises through the pipeline pressure sensor 5, and when the pipeline pressure sensor 5 detects that the pressure of the gas in the pressure maintaining pipeline 2 rises, proving that the gas in the vacuum bin body 1 or the gas cylinder enters the pressure maintaining pipeline 2, namely, the condition that the cylinder valve has leakage or poor air tightness;
The alarm detection test comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, a second pneumatic valve 14 is opened, non-helium inert gas in an inert gas cylinder or an inert gas pipe network 13 enters a pressure maintaining pipeline 2 for gas replacement, and after replacement, the second pneumatic valve 14 is closed and pressure is released, so that the pressure in the pressure maintaining pipeline 2 is kept consistent with the pressure in a vacuum bin body 1;
step 3, the cylinder valve of the gas cylinder is in a closed state, and the pressure in the gas cylinder is higher than the pressure in the vacuum bin body 1;
Step 4, the PLC control system 26 controls the fourth pneumatic valve 24 to be opened and starts the pumping alarm device 22, wherein the gas in the gas cylinder in the step1 is consistent with the gas detected by the pumping alarm device 22;
And 5, when the pumping type alarm device 22 detects the gas in the pressure maintaining pipeline 2, detecting that the gas in the pressure maintaining pipeline 2 contains the gas component in the gas cylinder, and indicating that the cylinder valve has leakage.
The above cross-validation proves that the bottle valve has leakage, and therefore, inspection maintenance or replacement is required.
Example 6
The structure of the pressure-maintaining leakage-testing device for the gas cylinder is the same as that of the embodiment 1;
the pressure-maintaining leakage-testing method of the gas cylinder pressure-maintaining leakage-testing device comprises the following steps of a positive pressure air tightness test of a cylinder valve interface, a negative pressure air tightness test of the cylinder valve interface and a helium mass spectrometer leak detector detection test:
the positive pressure air tightness test of the bottle valve interface comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, filling test gas into the pressure maintaining pipeline 2, so that the gas pressure in the pressure maintaining pipeline 2 is higher than the pressure in the vacuum bin body 1 and is lower than the pressure in the gas cylinder;
Step 3, detecting whether the pressure of the gas in the pressure maintaining pipeline 2 fluctuates or not through the pipeline pressure sensor 5, and when the pipeline pressure sensor 5 detects that the pressure of the gas in the pressure maintaining pipeline 2 is reduced, proving that the gas in the pressure maintaining pipeline 2 leaks into the vacuum bin body 1 through the bottle valve, namely the air tightness of the bottle valve is poor;
step 4, after the detection is finished, recovering the test gas in the pressure maintaining pipeline 2 or vacuumizing by using a pipeline vacuumizing device 9;
The negative pressure air tightness test of the bottle valve interface comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, opening a second pneumatic valve 14, enabling non-helium inert gas in an inert gas cylinder or an inert gas pipe network 13 to enter a pressure maintaining pipeline 2 for gas replacement, closing the second pneumatic valve 14 after the replacement and releasing pressure, and finally vacuumizing the pressure maintaining pipeline 2 by utilizing a pipeline vacuumizing device 9, and determining the vacuum degree in the pressure maintaining pipeline 2 by utilizing a vacuum gauge 20;
Step 3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the gas cylinder is larger than the pressure in the vacuum chamber body 1, and the pressure in the vacuum chamber body 1 is larger than the pressure in the pressure maintaining pipeline 2;
Step 4, detecting whether the pressure of the gas in the pressure maintaining pipeline 2 rises through the pipeline pressure sensor 5, and when the pipeline pressure sensor 5 detects that the pressure of the gas in the pressure maintaining pipeline 2 rises, proving that the gas in the vacuum bin body 1 or the gas cylinder enters the pressure maintaining pipeline 2, namely, the condition that the cylinder valve has leakage or poor air tightness;
the helium mass spectrometer leak detector detection test comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, starting a vacuumizing device 3, vacuumizing the vacuum bin body 1, closing the vacuumizing device 3 when a preset vacuum value is reached, and opening a first pneumatic valve 11 to enable helium in a helium bottle or a helium pipe network 10 to enter the vacuum bin body 1;
Step 3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the vacuum chamber body 1 is larger than the pressure in the pressure maintaining pipeline 2, and the pressure in the vacuum chamber body 1 is smaller than the pressure in the gas cylinder;
step 4, the PLC control system 26 controls the fifth pneumatic valve 25 to open, and starts the helium mass spectrometer leak detector 23;
And 5, when the helium mass spectrometer leak detector 23 detects the gas in the pressure maintaining pipeline 2, detecting that the gas in the pressure maintaining pipeline 2 contains helium components, and indicating that the bottle valve has poor air tightness.
After the test is finished, when a person needs to enter, the ventilation motor 17 is started, the oxygen content meter 8 detects the oxygen content in the vacuum bin body 1 in real time, and when the oxygen content reaches the human body entry standard, the bin door with the control lock 16 is opened.
The above cross-validation proves that the bottle valve has leakage, and therefore, inspection maintenance or replacement is required.
Example 7
The structure of the pressure-maintaining leakage-testing device for the gas cylinder is the same as that of the embodiment 1;
A pressure-maintaining leakage-testing method of a pressure-maintaining leakage-testing device of a gas cylinder comprises a negative pressure air tightness test of a cylinder valve interface and a detection test of an alarm;
The negative pressure air tightness test of the bottle valve interface comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, opening a second pneumatic valve 14, enabling non-helium inert gas in an inert gas cylinder or an inert gas pipe network 13 to enter a pressure maintaining pipeline 2 for gas replacement, closing the second pneumatic valve 14 after the replacement and releasing pressure, and finally vacuumizing the pressure maintaining pipeline 2 by utilizing a pipeline vacuumizing device 9, and determining the vacuum degree in the pressure maintaining pipeline 2 by utilizing a vacuum gauge 20;
Step 3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the gas cylinder is larger than the pressure in the vacuum chamber body 1, and the pressure in the vacuum chamber body 1 is larger than the pressure in the pressure maintaining pipeline 2;
Step 4, detecting whether the pressure of the gas in the pressure maintaining pipeline 2 rises through the pipeline pressure sensor 5, and when the pipeline pressure sensor 5 detects that the pressure of the gas in the pressure maintaining pipeline 2 rises, proving that the gas in the vacuum bin body 1 or the gas cylinder enters the pressure maintaining pipeline 2, namely, the condition that the cylinder valve has leakage or poor air tightness;
The alarm detection test comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, a second pneumatic valve 14 is opened, non-helium inert gas in an inert gas cylinder or an inert gas pipe network 13 enters a pressure maintaining pipeline 2 for gas replacement, and after replacement, the second pneumatic valve 14 is closed and pressure is released, so that the pressure in the pressure maintaining pipeline 2 is kept consistent with the pressure in a vacuum bin body 1;
step 3, the cylinder valve of the gas cylinder is in a closed state, and the pressure in the gas cylinder is higher than the pressure in the vacuum bin body 1;
Step 4, the PLC control system 26 controls the fourth pneumatic valve 24 to be opened and starts the pumping alarm device 22, wherein the gas in the gas cylinder in the step1 is consistent with the gas detected by the pumping alarm device 22;
And 5, when the pumping type alarm device 22 detects the gas in the pressure maintaining pipeline 2, detecting that the gas in the pressure maintaining pipeline 2 does not contain the gas component in the gas cylinder, and indicating that the gas cylinder valve does not leak.
The cross-validation proves that the bottle valve has no leakage, but has the defect of poor air tightness, so that the bottle valve needs to be checked and maintained.
Example 8
The structure of the pressure-maintaining leakage-testing device for the gas cylinder is the same as that of the embodiment 1;
a pressure-maintaining leakage-testing method of a pressure-maintaining leakage-testing device of a gas cylinder comprises a negative pressure air tightness test of a cylinder valve interface, a detection test of an alarm instrument and a detection test of a helium mass spectrometer leakage detector;
The negative pressure air tightness test of the bottle valve interface comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, opening a second pneumatic valve 14, enabling non-helium inert gas in an inert gas cylinder or an inert gas pipe network 13 to enter a pressure maintaining pipeline 2 for gas replacement, closing the second pneumatic valve 14 after the replacement and releasing pressure, and finally vacuumizing the pressure maintaining pipeline 2 by utilizing a pipeline vacuumizing device 9, and determining the vacuum degree in the pressure maintaining pipeline 2 by utilizing a vacuum gauge 20;
Step 3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the gas cylinder is larger than the pressure in the vacuum chamber body 1, and the pressure in the vacuum chamber body 1 is larger than the pressure in the pressure maintaining pipeline 2;
Step 4, detecting whether the pressure of the gas in the pressure maintaining pipeline 2 rises through the pipeline pressure sensor 5, and when the pipeline pressure sensor 5 detects that the pressure of the gas in the pressure maintaining pipeline 2 rises, proving that the gas in the vacuum bin body 1 or the gas cylinder enters the pressure maintaining pipeline 2, namely, the condition that the cylinder valve has leakage or poor air tightness;
The alarm detection test comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, a second pneumatic valve 14 is opened, non-helium inert gas in an inert gas cylinder or an inert gas pipe network 13 enters a pressure maintaining pipeline 2 for gas replacement, and after replacement, the second pneumatic valve 14 is closed and pressure is released, so that the pressure in the pressure maintaining pipeline 2 is kept consistent with the pressure in a vacuum bin body 1;
step 3, the cylinder valve of the gas cylinder is in a closed state, and the pressure in the gas cylinder is higher than the pressure in the vacuum bin body 1;
Step 4, the PLC control system 26 controls the fourth pneumatic valve 24 to be opened and starts the pumping alarm device 22, wherein the gas in the gas cylinder in the step1 is consistent with the gas detected by the pumping alarm device 22;
step 5, when the pumping type alarm device 22 detects the gas in the pressure maintaining pipeline 2, detecting that the gas in the pressure maintaining pipeline 2 contains the gas component in the gas cylinder, and indicating that the leakage exists in the cylinder valve;
the helium mass spectrometer leak detector detection test comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, starting a vacuumizing device 3, vacuumizing the vacuum bin body 1, closing the vacuumizing device 3 when a preset vacuum value is reached, and opening a first pneumatic valve 11 to enable helium in a helium bottle or a helium pipe network 10 to enter the vacuum bin body 1;
Step 3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the vacuum chamber body 1 is larger than the pressure in the pressure maintaining pipeline 2, and the pressure in the vacuum chamber body 1 is smaller than the pressure in the gas cylinder;
step 4, the PLC control system 26 controls the fifth pneumatic valve 25 to open, and starts the helium mass spectrometer leak detector 23;
and 5, when the helium mass spectrometer leak detector 23 detects the gas in the pressure maintaining pipeline 2, detecting that the gas in the pressure maintaining pipeline 2 does not contain helium components, and indicating that the air tightness of the bottle valve is good.
After the test is finished, when a person needs to enter, the ventilation motor 17 is started, the oxygen content meter 8 detects the oxygen content in the vacuum bin body 1 in real time, and when the oxygen content reaches the human body entry standard, the bin door with the control lock 16 is opened.
The cross-validation proves that the bottle valve has leakage and has no defect of poor air tightness, so that the bottle valve needs to be checked, maintained or replaced.
Example 9
The structure of the pressure-maintaining leakage-testing device for the gas cylinder is the same as that of the embodiment 1;
a pressure-maintaining leakage-testing method of a pressure-maintaining leakage-testing device of a gas cylinder comprises a negative pressure air tightness test of a cylinder valve interface, a detection test of an alarm instrument and a detection test of a helium mass spectrometer leakage detector;
The negative pressure air tightness test of the bottle valve interface comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, opening a second pneumatic valve 14, enabling non-helium inert gas in an inert gas cylinder or an inert gas pipe network 13 to enter a pressure maintaining pipeline 2 for gas replacement, closing the second pneumatic valve 14 after the replacement and releasing pressure, and finally vacuumizing the pressure maintaining pipeline 2 by utilizing a pipeline vacuumizing device 9, and determining the vacuum degree in the pressure maintaining pipeline 2 by utilizing a vacuum gauge 20;
Step 3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the gas cylinder is larger than the pressure in the vacuum chamber body 1, and the pressure in the vacuum chamber body 1 is larger than the pressure in the pressure maintaining pipeline 2;
Step 4, detecting whether the gas pressure in the pressure maintaining pipeline 2 rises or not through the pipeline pressure sensor 5, and when the pipeline pressure sensor 5 detects that the gas pressure in the pressure maintaining pipeline 2 is unchanged, ensuring good air tightness of the bottle valve and avoiding leakage;
The alarm detection test comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, a second pneumatic valve 14 is opened, non-helium inert gas in an inert gas cylinder or an inert gas pipe network 13 enters a pressure maintaining pipeline 2 for gas replacement, and after replacement, the second pneumatic valve 14 is closed and pressure is released, so that the pressure in the pressure maintaining pipeline 2 is kept consistent with the pressure in a vacuum bin body 1;
step 3, the cylinder valve of the gas cylinder is in a closed state, and the pressure in the gas cylinder is higher than the pressure in the vacuum bin body 1;
Step 4, the PLC control system 26 controls the fourth pneumatic valve 24 to be opened and starts the pumping alarm device 22, wherein the gas in the gas cylinder in the step1 is consistent with the gas detected by the pumping alarm device 22;
Step 5, when the pumping type alarm device 22 detects the gas in the pressure maintaining pipeline 2, detecting that the gas in the pressure maintaining pipeline 2 does not contain the gas component in the gas cylinder, and indicating that the gas cylinder valve does not leak;
the helium mass spectrometer leak detector detection test comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, starting a vacuumizing device 3, vacuumizing the vacuum bin body 1, closing the vacuumizing device 3 when a preset vacuum value is reached, and opening a first pneumatic valve 11 to enable helium in a helium bottle or a helium pipe network 10 to enter the vacuum bin body 1;
Step 3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the vacuum chamber body 1 is larger than the pressure in the pressure maintaining pipeline 2, and the pressure in the vacuum chamber body 1 is smaller than the pressure in the gas cylinder;
step 4, the PLC control system 26 controls the fifth pneumatic valve 25 to open, and starts the helium mass spectrometer leak detector 23;
and 5, when the helium mass spectrometer leak detector 23 detects the gas in the pressure maintaining pipeline 2, detecting that the gas in the pressure maintaining pipeline 2 does not contain helium components, and indicating that the air tightness of the bottle valve is good.
After the test is finished, when a person needs to enter, the ventilation motor 17 is started, the oxygen content meter 8 detects the oxygen content in the vacuum bin body 1 in real time, and when the oxygen content reaches the human body entry standard, the bin door with the control lock 16 is opened.
The cross-validation proves that the bottle valve has no leakage and good air tightness.
Example 10
The structure of the pressure-maintaining leakage-testing device for the gas cylinder is the same as that of the embodiment 1;
The pressure-maintaining leakage-testing method of the pressure-maintaining leakage-testing device of the gas cylinder comprises the following steps of a positive pressure air tightness test of a valve interface of the gas cylinder and a detection test of a helium mass spectrometer leak detector:
the positive pressure air tightness test of the bottle valve interface comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, filling test gas into the pressure maintaining pipeline 2, so that the gas pressure in the pressure maintaining pipeline 2 is higher than the pressure in the vacuum bin body 1 and is lower than the pressure in the gas cylinder;
Step 3, detecting whether the pressure of the gas in the pressure maintaining pipeline 2 fluctuates or not through the pipeline pressure sensor 5, and when the pipeline pressure sensor 5 detects that the pressure of the gas in the pressure maintaining pipeline 2 is reduced, proving that the gas in the pressure maintaining pipeline 2 leaks into the vacuum bin body 1 through the bottle valve, namely the air tightness of the bottle valve is poor;
step 4, after the detection is finished, recovering the test gas in the pressure maintaining pipeline 2 or vacuumizing by using a pipeline vacuumizing device 9;
the helium mass spectrometer leak detector detection test comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, starting a vacuumizing device 3, vacuumizing the vacuum bin body 1, closing the vacuumizing device 3 when a preset vacuum value is reached, and opening a first pneumatic valve 11 to enable helium in a helium bottle or a helium pipe network 10 to enter the vacuum bin body 1;
Step 3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the vacuum chamber body 1 is larger than the pressure in the pressure maintaining pipeline 2, and the pressure in the vacuum chamber body 1 is smaller than the pressure in the gas cylinder;
step 4, the PLC control system 26 controls the fifth pneumatic valve 25 to open, and starts the helium mass spectrometer leak detector 23;
step 5, when the helium mass spectrometer leak detector 23 detects the gas in the pressure maintaining pipeline 2, detecting that the gas in the pressure maintaining pipeline 2 contains helium components, and indicating that the bottle valve has poor air tightness;
after the test is finished, when a person needs to enter, the ventilation motor 17 is started, the oxygen content meter 8 detects the oxygen content in the vacuum bin body 1 in real time, and when the oxygen content reaches the human body entry standard, the bin door with the control lock 16 is opened.
The cross-validation proves that the bottle valve has no leakage, but has the defect of poor air tightness, so that the bottle valve needs to be checked and maintained.
The invention is also suitable for detecting the gas cylinders in batches on a large scale, if the batch detection of the gas cylinders is free of problems, the whole batch is free of problems, if the batch is free of problems, the batch is split, the gas cylinders without problems are removed after the split, and the other gas cylinders are split again so as to achieve the aim of improving the detection efficiency.
Test example 1
The invention adopts a positive pressure air tightness test of a bottle valve interface, and comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, filling test gas into the pressure maintaining pipeline 2, so that the gas pressure in the pressure maintaining pipeline 2 is higher than the pressure in the vacuum bin body 1 and is lower than the pressure in the gas cylinder, wherein the gas cylinder valve of the gas cylinder is in a closed state, the volume of the gas cylinder is 40L, the pressure is 13.52MPA, the filled product gas is electronic-grade carbon dioxide, the pressure in the pressure maintaining pipeline 2 is 7.5MPA, and the vacuum bin pressure is atmospheric pressure;
Step 3, detecting whether the pressure of the gas in the pressure maintaining pipeline 2 fluctuates or not through the pipeline pressure sensor 5, and when the pipeline pressure sensor 5 detects that the pressure of the gas in the pressure maintaining pipeline 2 drops by 1KPA, proving that the gas in the pressure maintaining pipeline 2 leaks into the vacuum bin body 1 through the bottle valve, namely the air tightness of the bottle valve is poor;
step 4, after the detection is finished, recovering the test gas in the pressure maintaining pipeline 2 or vacuumizing by using a pipeline vacuumizing device 9;
The air tightness problem of the cylinder valve of the air cylinder can be proved by the mode, and when the air cylinder valve is detected by a conventional leakage liquid mode, leakage and seepage are not found, so that the air cylinder valve of the air cylinder is qualified.
Test example 2
The invention adopts a bottle valve interface negative pressure air tightness test, which comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, opening a second pneumatic valve 14, enabling non-helium inert gas in an inert gas cylinder or an inert gas pipe network 13 to enter a pressure maintaining pipeline 2 for gas replacement, closing the second pneumatic valve 14 after the replacement and releasing pressure, and finally vacuumizing the pressure maintaining pipeline 2 by utilizing a pipeline vacuumizing device 9, and determining the vacuum degree in the pressure maintaining pipeline 2 by utilizing a vacuum gauge 20;
Step 3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the gas cylinder is larger than the pressure in the vacuum chamber body 1, the pressure in the vacuum chamber body 1 is larger than the pressure in the pressure maintaining pipeline 2, the cylinder valve of the gas cylinder is in a closed state, the volume of the gas cylinder is 40L, the pressure is 13.52MPA, the filled product gas is carbon monoxide of an electronic grade, the vacuumizing pressure in the pressure maintaining pipeline 2 is-90 kPa, and the pressure in the vacuum chamber is atmospheric pressure;
step 4, detecting whether the pressure of the gas in the pressure maintaining pipeline 2 rises through the pipeline pressure sensor 5, and when the pipeline pressure sensor 5 detects that the pressure of the gas in the pressure maintaining pipeline 2 rises by 5kPa, proving that the gas in the vacuum bin body 1 or the gas cylinder enters the pressure maintaining pipeline 2, namely, the condition that the cylinder valve has leakage or poor air tightness;
Further, an alarm detection test is adopted, and the method comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, a second pneumatic valve 14 is opened, non-helium inert gas in an inert gas cylinder or an inert gas pipe network 13 enters a pressure maintaining pipeline 2 for gas replacement, and after replacement, the second pneumatic valve 14 is closed and pressure is released, so that the pressure in the pressure maintaining pipeline 2 is consistent with the pressure in a vacuum bin body 1, wherein the pressure of the pressure maintaining pipeline 2 and the pressure of the vacuum bin body 1 are both atmospheric pressure;
step 3, the cylinder valve of the gas cylinder is in a closed state, and the pressure in the gas cylinder is higher than the pressure in the vacuum bin body 1;
step 4, the PLC control system 26 controls the fourth pneumatic valve 24 to be opened and starts the pumping type alarm instrument 22, wherein the pumping type alarm instrument 22 is a CO gas detector;
Step 5, when the pumping type alarm device 22 detects the gas in the pressure maintaining pipeline 2, detecting that the gas in the pressure maintaining pipeline 2 does not contain the gas component in the gas cylinder, and indicating that the gas cylinder valve does not leak;
Further, a helium mass spectrometer leak detector detection test is employed, comprising the steps of:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint 4 in a pressure maintaining pipeline 2;
Step 2, starting a vacuumizing device 3, vacuumizing the vacuum bin body 1, closing the vacuumizing device 3 when a preset vacuum value is reached, and opening a first pneumatic valve 11 to enable helium in a helium bottle or a helium pipe network 10 to enter the vacuum bin body 1, wherein the pressure of a pressure maintaining pipeline 2 is atmospheric pressure;
Step 3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the vacuum chamber body 1 is larger than the pressure in the pressure maintaining pipeline 2, and the pressure in the vacuum chamber body 1 is smaller than the pressure in the gas cylinder;
step 4, the PLC control system 26 controls the fifth pneumatic valve 25 to open, and starts the helium mass spectrometer leak detector 23;
In step 5, when the helium mass spectrometer leak detector 23 detects the gas in the pressure maintaining pipeline 2, the gas in the pressure maintaining pipeline 2 is detected to contain helium components, the detection concentration is 1.0X10 -7 mbar.I/s, and the condition that the air tightness of the bottle valve is poor is indicated.
The air tightness problem of the cylinder valve of the air cylinder can be proved by the mode, and when the air cylinder valve is detected by a conventional leakage liquid mode, leakage and seepage are not found, so that the air cylinder valve of the air cylinder is qualified.
The two test examples can prove that the detection method can detect the leakage problem and the air tightness of the air cylinder on the premise of not using leakage liquid, and particularly, the accuracy rate of the detection method is higher than that of the prior art in the aspect of detecting the air tightness of the air cylinder.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. The pressure-maintaining leakage-testing device for the gas cylinder comprises a vacuum bin body (1) and is characterized in that a pressure-maintaining pipeline (2) is arranged in the vacuum bin body (1);
the vacuum bin body (1) is provided with a vacuumizing device (3), a vacuum bin detection unit and a helium filling pipeline part;
The pressure maintaining pipeline (2) is provided with a plurality of gas bottle connectors (4) and pipeline pressure sensors (5), a pressure maintaining pipeline detection unit is arranged outside the vacuum bin body (1), and the pressure maintaining pipeline (2) is also connected with a non-helium inert gas filling pipeline part;
The vacuum bin detection unit comprises a bin body pressure sensor (7) for detecting the internal pressure of the vacuum bin body (1), and an oxygen content meter (8) for detecting the internal oxygen content of the vacuum bin body (1);
the pressure maintaining pipeline detection unit at least comprises a pipeline vacuumizing device (9) for vacuumizing the pressure maintaining pipeline (2) and a gas detection part for detecting whether other gases leak into the pressure maintaining pipeline (2);
The helium filling pipeline part comprises a helium bottle or a helium pipe network (10), the helium bottle or the helium pipe network (10) is connected with the vacuum bin body (1) through a pipeline, and a first pneumatic valve (11) and a helium pressure sensor (12) are arranged on the pipeline;
The non-helium inert gas filling pipeline part comprises an inert gas cylinder or an inert gas pipe network (13), the inert gas cylinder or the inert gas pipe network (13) is connected with the pressure maintaining pipeline (2) through a pipeline, and a second pneumatic valve (14) and an inert gas pressure sensor (15) are arranged on the pipeline;
The pressure maintaining pipeline (2) is connected with the pipeline vacuumizing device (9) through a vacuumizing pipeline, and a first tee joint (18), a second tee joint (19), a vacuum gauge (20) for detecting the vacuum degree in the vacuumizing pipeline and a third pneumatic valve (21) are sequentially arranged on the vacuumizing pipeline;
The gas detection part comprises a pumping type alarm (22) connected with the third end of the first tee joint (18), and a helium mass spectrum leak detector (23) connected with the third end of the second tee joint (19).
2. The pressure-maintaining leakage-testing device for the gas cylinder according to claim 1 is characterized in that a door with an electric control lock (16) is arranged on the vacuum chamber body (1), and a ventilation pipeline with a ventilation motor (17) is arranged on the vacuum chamber body (1).
3. The gas cylinder pressure maintaining leakage testing device according to claim 2 is characterized in that a fourth pneumatic valve (24) is arranged between the third end of the first tee joint (18) and the pumping type alarm instrument (22), and a fifth pneumatic valve (25) is arranged between the third end of the second tee joint (19) and the helium mass spectrometer leak detector (23).
4. The gas cylinder pressure maintaining leakage testing device according to claim 3 is characterized by further comprising a PLC control system (26), wherein the signal input end of the PLC control system (26) is respectively connected with a pipeline pressure sensor (5), a pipeline temperature sensor (6), a bin body pressure sensor (7), an oxygen content meter (8), a helium pressure sensor (12), an inert gas pressure sensor (15), a vacuum gauge (20), a pumping alarm instrument (22) and a helium mass spectrum leak detector (23), the signal output end of the PLC control system (26) is respectively connected with a first pneumatic valve (11), a second pneumatic valve (14), a third pneumatic valve (21), a fourth pneumatic valve (24), a fifth pneumatic valve (25), a vacuumizing device (3), a vacuum gauge (20) and a pipeline vacuumizing device (9), and the pipeline temperature sensor (6) is further arranged on the pressure maintaining pipeline (2).
5. A pressure-maintaining leakage testing method of the pressure-maintaining leakage testing device for the gas cylinder according to claim 4, wherein the pressure-maintaining leakage testing method comprises a positive pressure air tightness test of a valve interface of the gas cylinder, a negative pressure air tightness test of the valve interface of the gas cylinder, a detection test of an alarm instrument and a detection test of a helium mass spectrometer leakage detector;
The positive pressure airtight test of the bottle valve interface is used for detecting whether gas in the pressure maintaining pipeline (2) leaks into the vacuum bin body (1) through the bottle valve and whether the gas of the gas bottle enters the pressure maintaining pipeline (2);
the cylinder valve interface negative pressure air tightness test is used for detecting whether gas in the gas cylinder or the vacuum bin body (1) enters the pressure maintaining pipeline (2) through the cylinder valve interface;
the alarm detection test is used for detecting whether gas in the gas cylinder enters the pressure maintaining pipeline (2) through the cylinder valve interface;
The helium mass spectrometer leak detector detection test is used for detecting whether the gas in the vacuum bin body (1) leaks into the pressure maintaining pipeline (2) through the bottle valve.
6. The pressure maintaining leak testing method of the gas cylinder pressure maintaining leak testing device as set forth in claim 5, wherein the positive pressure airtight test of the valve port, the negative pressure airtight test of the valve port, the alarm detection test and the helium mass spectrometer leak detector detection test respectively comprise the following steps:
the positive pressure air tightness test of the bottle valve interface comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint (4) in a pressure maintaining pipeline (2);
step 2, filling test gas into the pressure maintaining pipeline (2) to enable the gas pressure in the pressure maintaining pipeline (2) to be larger than the pressure in the vacuum bin body (1) and smaller than the pressure in the gas cylinder;
detecting whether the pressure of the gas in the pressure maintaining pipeline (2) fluctuates or not through a pipeline pressure sensor (5), when the pipeline pressure sensor (5) detects that the pressure of the gas in the pressure maintaining pipeline (2) is reduced, proving that the gas in the pressure maintaining pipeline (2) leaks into a vacuum bin body (1) through a bottle valve, namely, the air tightness of the bottle valve is poor, when the pipeline pressure sensor (5) detects that the pressure of the gas in the pressure maintaining pipeline (2) is increased, proving that the gas in a gas bottle enters the pressure maintaining pipeline (2), namely, the bottle valve leaks, and when the pipeline pressure sensor (5) detects that the gas in the pressure maintaining pipeline (2) is unchanged, proving that the air tightness of the bottle valve is good and the phenomenon of leakage cannot occur;
Step 4, after the detection is finished, recovering the test gas in the pressure maintaining pipeline (2), or vacuumizing by using a pipeline vacuumizing device (9);
The negative pressure air tightness test of the bottle valve interface comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint (4) in a pressure maintaining pipeline (2);
step 2, a second pneumatic valve (14) is opened, non-helium inert gas in an inert gas cylinder or an inert gas pipe network (13) enters a pressure maintaining pipeline (2) for gas replacement, the second pneumatic valve (14) is closed and pressure is released after the replacement, and finally a pipeline vacuumizing device (9) is used for vacuumizing the pressure maintaining pipeline (2), and the vacuum degree in the pressure maintaining pipeline (2) is determined through a vacuum gauge (20);
Step3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the gas cylinder is larger than the pressure in the vacuum chamber body (1), and the pressure in the vacuum chamber body (1) is larger than the pressure in the pressure maintaining pipeline (2);
Step 4, detecting whether the pressure of the gas in the pressure maintaining pipeline (2) rises through a pipeline pressure sensor (5), and when the pipeline pressure sensor (5) detects that the pressure of the gas in the pressure maintaining pipeline (2) rises, proving that the gas in the vacuum bin body (1) or the gas cylinder enters the pressure maintaining pipeline (2), namely, the condition that a cylinder valve has leakage or poor air tightness;
when the pipeline pressure sensor (5) detects that the gas pressure in the pressure maintaining pipeline (2) is unchanged, the air tightness of the bottle valve is good, and the leakage phenomenon can not occur;
The alarm detection test comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint (4) in a pressure maintaining pipeline (2);
step 2, opening a second pneumatic valve (14), enabling non-helium inert gas in an inert gas cylinder or an inert gas pipe network (13) to enter a pressure maintaining pipeline (2) for gas replacement, closing the second pneumatic valve (14) after replacement and releasing pressure, so that the pressure in the pressure maintaining pipeline (2) is consistent with the pressure in a vacuum bin body (1);
Step 3, the cylinder valve of the gas cylinder is in a closed state, and the pressure in the gas cylinder is higher than the pressure in the vacuum bin body (1);
Step 4, a PLC control system (26) controls a fourth pneumatic valve (24) to be opened and starts a pumping type alarm (22), wherein the gas in the gas cylinder in the step 1 is consistent with the gas detected by the pumping type alarm (22);
Step 5, when the pumping type alarm (22) detects the gas in the pressure maintaining pipeline (2), detecting that the gas in the pressure maintaining pipeline (2) contains the gas component in the gas cylinder, and indicating the condition that the cylinder valve has leakage;
Detecting that the gas in the pressure maintaining pipeline (2) does not contain the gas component in the gas cylinder, and indicating that the gas cylinder valve does not leak;
the helium mass spectrometer leak detector detection test comprises the following steps:
Step 1, connecting a cylinder valve of a gas cylinder with a filling row of a gas cylinder joint (4) in a pressure maintaining pipeline (2);
starting a vacuumizing device (3), vacuumizing the vacuum bin body (1), closing the vacuumizing device (3) when a preset vacuum value is reached, and opening a first pneumatic valve (11) to enable helium in a helium bottle or a helium pipe network (10) to enter the vacuum bin body (1);
Step 3, the cylinder valve of the gas cylinder is in a closed state, the pressure in the vacuum chamber body (1) is larger than the pressure in the pressure maintaining pipeline (2), and the pressure in the vacuum chamber body (1) is smaller than the pressure in the gas cylinder;
step 4, a PLC control system (26) controls a fifth pneumatic valve (25) to be opened, and a helium mass spectrometer leak detector (23) is started;
Step 5, when the helium mass spectrometer leak detector (23) detects the gas in the pressure maintaining pipeline (2), detecting that the gas in the pressure maintaining pipeline (2) contains helium components, and indicating that the bottle valve has poor air tightness;
the detection of the absence of helium in the gas in the pressure maintaining pipe (2) indicates that the cylinder valve has good air tightness.
7. The pressure maintaining leakage testing method of the gas cylinder pressure maintaining leakage testing device according to claim 6, wherein after the test is finished, when a person needs to enter, a ventilation motor (17) is started, an oxygen content meter (8) detects the oxygen content in the vacuum bin body (1) in real time, and when the oxygen content reaches the human body entering standard, a bin door with a control lock (16) is opened.
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CN110068430A (en) * 2019-05-09 2019-07-30 中南大学 A kind of leakage test method of aerospace composite tank
CN112903203A (en) * 2021-01-27 2021-06-04 中核能源科技有限公司 Large-scale container positive pressure helium mass spectrometry detection system and detection method
CN218349731U (en) * 2022-08-18 2023-01-20 大连理工大学 Gas cylinder leakage rate detection system based on vacuum chamber method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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