CN115876397A - Testing device and method for detecting leakage rate of hydrogen-doped pipeline connecting piece and sealing piece - Google Patents
Testing device and method for detecting leakage rate of hydrogen-doped pipeline connecting piece and sealing piece Download PDFInfo
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Abstract
The invention provides a device and a method for detecting the leakage rate of a hydrogen-doped pipeline connecting piece and a sealing piece, comprising the following steps: a sealing module and a detection unit; the sealing module comprises a hydrogen-doped gas cylinder, a high-pressure pump and a high-low temperature box which are sequentially connected, a to-be-detected piece is installed in the high-low temperature box, and one end of the high-low temperature box is connected with the detection unit; the detection unit comprises a drainage method detection unit and a differential pressure method detection unit, and leakage detection data are obtained by the detection unit, so that leakage rate data are continuously optimized, and the sealing performance of the pipeline connecting piece and the sealing piece is improved.
Description
Technical Field
The invention belongs to the technical field of detection of pipeline connecting pieces and sealing pieces, and particularly relates to a leakage rate detection experimental device and method for hydrogen-doped pipeline connecting pieces and sealing pieces.
Background
At present, the hydrogen conveying mode can be pipeline conveying, high-pressure gas cylinder conveying, liquid hydrogen tank truck conveying and the like, but long-distance pipeline conveying is easier to realize long-distance and large-scale conveying of hydrogen, so that the hydrogen is mixed into a natural gas pipeline for conveying, and the best mode is provided at present. At present, the development of the natural gas pipeline transportation industry for hydrogen-doped at home and abroad is still in the primary stage, and although a plurality of related researches and projects are developed, a plurality of problems to be solved and perfected still exist.
In long-distance pipeline transportation, the flanges are adopted to realize the connection between the pipeline sections, the sealing rings or the sealing gaskets are clamped in the flanges, the sealing performance and the safety of the flanges can be further improved, the connection between the pipeline sections can be realized through a welding process, and the common valves (the ball valve and the stop valve) of the pipeline can realize the flow regulation function and the pipeline section connection function. In the process of conveying pure hydrogen/hydrogen-doped natural gas, leakage phenomena occur at the flange sealing position, the pipeline welding position and the valve position, and the comparison shows that the hydrogen permeability coefficient of elastomer materials such as rubber used as a sealing member is much higher than that of non-metal materials used as a pipe material, so that the safety of gas conveying is reduced. Therefore, the sealing performance of the pipeline connecting piece and the sealing piece is optimized, and the reduction of the leakage rate of the pipeline connecting piece and the sealing piece is of great significance to the safe transportation of the hydrogen-doped natural gas pipeline.
The existing air tightness detection methods are diversified, such as a bubble detection method, a flow detection method, a helium detection method and the like. The bubble detection method can judge whether the workpiece leaks or not and the leakage position, the detection method is simple to operate and low in manufacturing cost, but the detection method is low in efficiency, and after detection is finished, the workpiece to be detected needs to be dried and subjected to rust prevention treatment; the flow detection method can quantitatively detect the leakage amount of the workpiece to be detected, and for the workpiece with small leakage, the flow detection method takes long time, so that the detection method is suitable for the workpiece with large leakage; the helium detection method can quantitatively calculate the leakage amount of the workpiece, but the detection method has high cost, large workpieces are difficult to detect due to the volume of a closed container, and in addition, the environment is damaged due to the leakage of helium to the atmosphere.
Pure hydrogen/natural gas pipeline transport is in the starting stage, and some technological development is not perfect, and the gas leakage quantity of flange seal subassembly department, pipeline welding department and valve department is less, and the gas tightness that is directed at little leakage detects and has following problem: the micro-leakage detection method is few, the detection precision and efficiency cannot be guaranteed, the detection period is long, and more material resources and manpower are consumed. For the flange sealing element, the hydrogen doping ratio, the working pressure, the environmental temperature, the bolt pretightening force, the size of the flange sealing element, the flange sealing surface form and the type of the sealing ring/sealing gasket material influence the leakage rate; for the pipeline with the welding line, the leakage rate is influenced by the hydrogen doping ratio, the working pressure, the ambient temperature, the size of the pipeline, the size of the welding line and the welding process; for the valve, the hydrogen doping ratio, the working pressure, the ambient temperature, the size and the type of the valve, the size of a valve gasket and the type of materials influence the leakage rate, and the three problems are lack of quantitative research conclusion and are difficult problems which need to be solved urgently for the safe transportation of the pipeline.
Disclosure of Invention
In order to solve the problems, the invention provides a leakage rate detection experimental device and a leakage rate detection experimental method for a hydrogen-doped pipeline connecting piece and a sealing piece based on micro-leakage air tightness detection and high-precision requirements and combined with actual operation conditions of a hydrogen-doped/pure hydrogen pipeline.
According to some embodiments, the invention adopts the following technical scheme:
in a first aspect, the invention provides a leakage rate detection experimental device for a hydrogen-doped pipeline connecting piece and a sealing piece, which comprises a high-low temperature box, a control unit, a pressure relief unit and a detection unit; the high-low temperature box is used for placing a piece to be detected, the gas supply unit is used for charging gas into the piece to be detected and comprises a gas inlet pipe, a stainless steel gas cylinder, a pressure gauge and an automatic stop valve, the stainless steel gas cylinder is used for storing hydrogen-doped gas, the gas inlet pipe is connected with the stainless steel gas cylinder, and the pressure gauge and the automatic stop valve are arranged on the gas inlet pipe; the control unit comprises a high-pressure pump, a pipeline one-way valve and a pressure sensor which are sequentially arranged on the air inlet pipe; the pressure relief unit is also arranged on the air inlet pipe; the detection unit is connected with the piece to be detected through the leakage pipe and is used for detecting the leakage rate of gas.
As a further technical scheme, the pressure relief unit comprises a manual pressure relief valve and an automatic pressure relief valve which are connected in parallel, and the manual pressure relief valve and the automatic pressure relief valve are connected with the stainless steel gas cylinder through pressure relief pipelines.
As a further technical scheme, the device also comprises a valve pneumatic energy supply unit, wherein the valve pneumatic energy supply unit comprises a pre-aeration inlet, an air diad, a pressure reducing valve, an air pressure meter and an electromagnetic valve which are sequentially connected, the electromagnetic valve is connected with a manual pressure relief valve, and the valve pneumatic energy supply unit provides aerodynamic force for the manual pressure relief valve and a vacuum pneumatic generator.
As a further technical scheme, the detection unit comprises a drainage method detection unit and a pressure difference method detection unit.
As a further technical scheme, the drainage method detection unit comprises a leakage detection pipe, a measuring cup and a water tank, wherein the measuring cup is placed in the water tank, gas leaked from a to-be-detected piece flows into the measuring cup through the leakage detection pipe through a through hole, the variation of the water level in the measuring cup is recorded, and the rising volume of the liquid level is the volume of the leaked gas.
As a further technical scheme, the pressure difference method detection unit comprises a leakage detection pipe, a negative pressure sensor, a vacuum valve and a pneumatic vacuum generator, wherein the pneumatic vacuum generator reduces the pressure in the leakage detection pipe to be vacuum, the pressure in the leakage detection pipe is increased by leaked gas, and the pressure change in the leakage detection pipe is collected in real time through the negative pressure sensor to obtain leakage detection data.
As a further technical scheme, the pneumatic vacuum generator is also connected to the valve pneumatic energy supply unit, and the valve pneumatic energy supply unit is used for providing energy for driving the pneumatic vacuum generator.
As a further technical scheme, the air inlet pipe is matched with the piece to be detected through threads.
As a further technical scheme, the leakage pipe is matched with the piece to be detected through threads.
In a second aspect, the invention provides a working method of a leakage rate detection experimental device for a hydrogen-doped pipeline connecting piece and a sealing piece, comprising the following steps:
selecting a proper hydrogen loading proportion according to experimental requirements, displaying the pressure of the gas in the hydrogen loading gas cylinder in real time through a pressure gauge, and then boosting the pressure to a specified pressure through a high-pressure pump;
the hydrogen-doped gas flow boosted by the high-pressure pump is filled to a piece to be detected through a pipeline one-way valve, a pressure gauge and a pressure sensor, and the piece to be detected is placed in a high-low temperature box;
aiming at hydrogen, a drainage method detection unit and a pressure difference method detection unit are adopted for detection, detected data are transmitted to a processor in real time, and a volume-time curve and a pressure-time curve are drawn;
and when the experiment is finished, the hydrogen-doped gas in the pipeline can be discharged by adopting a manual pressure release valve and an automatic pressure release valve, and the discharged gas can return to the hydrogen-doped gas cylinder.
Compared with the prior art, the invention has the beneficial effects that:
1. the sealing module comprises a hydrogen-doped gas cylinder, a high-pressure pump and a high-low temperature box which are sequentially connected, a to-be-detected piece is installed in the high-low temperature box, one end of the high-low temperature box is connected with a detection unit, and leakage detection data can be obtained by using the detection unit; the set of flow has multiple functions, and firstly, the leakage rate detection experiment can be carried out on multiple components (flange sealing parts, pipelines and valves with welding seams); and secondly, a multi-factor coupling leakage detection experiment can be carried out, the sealing property of the sealing assembly is improved through research of obtained data, and the problem of safe hydrogen-loading/pure hydrogen conveying can be solved.
2. The invention can compare the leakage detection precision, adopts the drainage method and the pressure difference method to further compare the precision of the two detection means, and provides a high-precision detection mode for micro-leakage detection.
3. The invention can explore the influence rule of multiple factors on the hydrogen-doped/pure hydrogen pipeline connecting piece and the sealing piece; for the flange sealing element, the quantitative influence rate of the hydrogen doping ratio, the working pressure, the environmental temperature, the bolt pretightening force, the size of the flange sealing element, the flange sealing surface form (plane and convex surface) and the type of sealing ring/sealing gasket materials (nitrile rubber, polytetrafluoroethylene rubber and metal wound gaskets) on the leakage rate can be researched; for the pipeline with the welding line, the quantitative influence rule of the hydrogen doping ratio, the working pressure, the environmental temperature, the pipeline size, the welding line size and the welding process on the leakage rate can be explored; for the valve, the quantitative influence rule of the hydrogen doping ratio, the working pressure, the ambient temperature, the size and the type of the valve, the size of a valve gasket and the type of materials on the leakage rate can be researched.
4. The air inlet pipe is in threaded connection with the piece to be detected and the leak detection pipe, so that the air inlet pipe is convenient to disassemble, high in safety coefficient, long in service life and convenient to maintain.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of a leakage rate testing experimental apparatus for a hydrogen-loading pipe connector and a sealing member according to a first embodiment;
FIG. 2 is a schematic view of a detection principle of a leakage rate of a flange-rubber O-ring-bolt provided with a groove according to the first embodiment;
FIG. 3 is a schematic diagram illustrating a detection principle of a flange-metal-wrapped gasket-bolt leakage rate according to the first embodiment;
FIG. 4 is a schematic diagram illustrating a leak rate detection principle of a weld joint of a pipeline according to the first embodiment;
FIG. 5 is a schematic diagram illustrating a leak rate detection principle of a ball valve according to the first embodiment;
fig. 6 is a schematic diagram of a leak rate detection principle of the first embodiment of the present invention.
In the figure: 1-1-a vacuum pneumatic generator, 1-2-a measuring cup, 1-3-an air inlet pipe, 1-4-a leakage detecting pipe, 1-5-a high-low temperature box, 1-6-an upper flange cover, 1-7-a lower flange cover and 1-8-an O-shaped ring;
2-1-a vacuum pneumatic generator, 2-2-a measuring cup, 2-3-an air inlet pipe, 2-4-a leakage detecting pipe, 2-5-a high-low temperature box, 2-6-an upper flange cover, 2-7-a lower flange cover and 2-8-a metal winding type gasket;
3-1-a vacuum pneumatic generator, 3-2-a measuring cup, 3-an air inlet pipe, 3-4-a leakage detecting pipe, 3-5-a high-low temperature box, 3-6-a sealing box and 3-7-a welding line;
4-1-a vacuum pneumatic generator, 4-2-a measuring cup, 4-3-an air inlet pipe, 4-4-a leakage detecting pipe, 4-5-a high-low temperature box, 4-6-a sealing box and 4-7-a flow channel;
5-1-a vacuum pneumatic generator, 5-2-a measuring cup, 5-3-an air inlet pipe, 5-4-a leakage detecting pipe, 5-5-a high-low temperature box, 5-6-a seal and 5-7-a flow passage.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The first embodiment is as follows:
as shown in fig. 1, the present embodiment provides a hydrogen loading pipe connector and a sealing member leakage rate detection experimental apparatus, which includes a sealing module and a detection unit;
the sealing module consists of a gas supply unit, a control unit, a pressure relief unit, a valve pneumatic energy supply unit and a to-be-detected piece, and particularly comprises a stainless steel gas cylinder, a pressure gauge, an automatic stop valve, a high-pressure pump, a pipeline check valve, a pressure gauge, a pressure sensor and a high-low temperature box which are sequentially connected, wherein the to-be-detected piece is installed in the high-low temperature box, and one end of the high-low temperature box is also connected with a detection unit; the pipeline between the pipeline one-way valve and the pressure sensor is also connected with the input end of the manual pressure release valve and the input end of the automatic pressure release valve, and the output end of the manual pressure release valve and the output end of the automatic pressure release valve are connected to the input port of the stainless steel gas cylinder.
The high-low temperature box is mainly used for simulating the temperature of the environment where the piece to be tested is located, so that the experimental device is closer to the actual working condition.
In this embodiment, the gas supply unit is composed of a stainless steel gas cylinder, a pressure gauge and an automatic stop valve, a proper hydrogen-loading proportion is selected according to experimental requirements, the pressure of gas in the hydrogen-loading gas cylinder is displayed in real time through the pressure gauge, and then the pressure is increased to a specified pressure through a high-pressure pump; and further, the leakage condition of the tested piece under different hydrogen loading ratios and working pressures can be explored.
In this embodiment, the control unit comprises a high-pressure pump, a pipeline check valve, a pressure sensor and a high-low temperature tank, the hydrogen-doped gas boosted by the high-pressure pump flows through the pipeline check valve, a pressure gauge and the pressure sensor and is filled into the flange to seal the piece to be measured, and the piece to be measured is placed in the high-low temperature tank in order to change the environmental temperature; the control unit can control the temperature of the high-low temperature box, the pressure of the air inlet pipe and the like; and further, the leakage condition of the tested piece under different hydrogen doping ratios and working pressures can be explored.
In this embodiment, the pressure relief unit is composed of a manual pressure relief valve and an automatic pressure relief valve, when the experiment is finished, the hydrogen-doped gas in the pipeline can be released by the manual pressure relief valve or the automatic pressure relief valve, and the released gas can return to the hydrogen-doped gas cylinder, so that cyclic utilization is realized.
Further, the sealing module still include valve pneumatic energy supply unit, valve pneumatic energy supply unit including the gas inlet that increases in advance, air diad, relief pressure valve, air pressure gauge and the solenoid valve that lay in proper order, the solenoid valve connect manual relief valve, valve pneumatic energy supply unit provides aerodynamic for manual relief valve and vacuum pneumatic generator.
Furthermore, the detection unit includes a drainage detection unit and a pressure difference detection unit, and the following describes the components of the apparatus.
Furthermore, the drainage method detection unit comprises a leakage detection pipe, a measuring cup and a water tank, when the drainage method is adopted for detection, gas leaked from a to-be-detected piece flows through the leakage detection pipe through the through hole and enters the measuring cup, the variation of the water level in the measuring cup is recorded, the rising volume of the liquid level is the volume of the leaked gas, and a volume-time curve is drawn;
furthermore, the pressure difference method detection unit comprises a negative pressure sensor, a vacuum valve and a pneumatic vacuum generator, the pneumatic vacuum generator is used for reducing the pressure in the leakage detection pipe to be vacuum, the leakage gas enables the pressure in the leakage detection pipe to be increased, the pressure change in the leakage detection pipe is collected in real time through the negative pressure sensor to obtain leakage detection data, and a pressure-time curve is drawn. The pneumatic vacuum generator is also connected to a valve pneumatic energy supply unit of the sealing module, and the valve pneumatic energy supply unit is used for supplying energy to the pneumatic vacuum generator for driving.
According to the invention, two different detection units are arranged, so that the comparison of the leakage detection precision can be carried out, two detection technologies of a drainage method and a pressure difference method are adopted, the precision of two detection means is further compared, and a high-precision detection mode is provided for micro-leakage detection.
Further, the valve pneumatic energy supply unit consists of an air diad, a pressure reducing valve, an air pressure gauge and an electromagnetic valve; the experimental device is in the hydrogen-doped working condition, and in order to ensure safety, a valve through which hydrogen flows uses an air source as power to realize switching. Valve pneumatic energy supply flow: the air gets into from prefabricated gas entry and compresses, for improve equipment's life, other impurity air-purifying are filtered through air diad to the air of compression, and the compressed air that purifies passes through relief pressure valve depressurization, shows air pressure through the manometer in real time, and air pressure gauge connects solenoid valve and pneumatic vacuum generator, and the air admission of the solenoid valve of flowing through gets into manual relief valve, provides power for the switch of manual relief valve and pneumatic vacuum generator.
Further, as shown in fig. 2, a schematic diagram of detecting a leakage rate of a flange, a rubber O-ring and a bolt provided with a groove is shown; the detected piece comprises a flange end cover and a flange base, two rings of sealing grooves are arranged on the flange base, a rubber O-shaped ring and an auxiliary sealing ring are arranged in one sealing ring, and bolt holes are formed in the flange end cover and the flange base; introducing gas into the matching surfaces of the flange end cover and the flange base through a gas inlet pipe; the flange end cover is provided with a through hole which is communicated with the matching surfaces of the flange end cover and the flange base, and the through hole is connected with the leakage detecting pipe; then, leak rate detection is performed.
Further, as shown in fig. 3, a schematic diagram of a detection principle of a flange with a convex surface, a metal wound gasket and a bolt leakage rate is shown; the detected piece comprises a flange end cover and a flange base, two metal winding gaskets and an auxiliary sealing gasket are arranged between the flange base and the flange end cover, and two through holes, namely a through hole I (air inlet hole) and a through hole II (air leakage hole), are arranged on the flange end cover; the first through hole is communicated with a gap formed by the metal winding gasket, the flange end cover and the flange base, and the second through hole is communicated with a gap formed by the auxiliary sealing gasket, the metal winding gasket, the flange end cover and the flange base; the first through hole is communicated with the air inlet pipe, and the second through hole is communicated with the leakage detecting pipe; then, leak rate detection is performed.
Further, as shown in fig. 4, a schematic diagram of a leak rate detection principle at a pipe weld joint is shown; the detected piece is a pipeline with a welding seam, two ends of the pipeline are sealed, and one end of the air inlet is provided with a through hole; this pipeline is placed in the seal box, and the intake pipe links to each other with the one end that the through-hole was seted up to the pipeline, inflates to the pipeline in, and the leak hunting pipe links to each other with the seal box is inside, then, carries out leakage rate and detects.
Further, as shown in fig. 5, a schematic diagram of a detection principle of a leakage rate of a ball valve is shown, wherein a detected part is the ball valve, two ends of the detected part are sealed, the ball valve is placed in a sealing box, and an air inlet pipe is connected with a flow passage of the ball valve and used for inflating the ball valve; the leak detection pipe is connected with the inside of the seal box, and then, the leakage rate is detected.
Further, as shown in fig. 6, the schematic diagram of the leak rate detection principle of the stop valve is shown, wherein the detected part is the stop valve, two ends of the detected part are sealed, the stop valve is arranged in a sealing box, and an air inlet pipe is connected with a flow passage of the stop valve and charges air into the stop valve; the leak detection pipe is connected with the inside of the seal box, and then, the leakage rate is detected.
The air inlet pipe is in threaded connection with the parts to be tested (the upper end cover of the flange, the welding seam of the pipeline, the ball valve and the stop valve) and the leakage detection pipe, so that the air inlet pipe is convenient to disassemble, high in safety coefficient, long in service life and convenient to maintain.
The device in the embodiment can explore the influence rule of multiple factors on the hydrogen-loading/pure hydrogen pipeline connecting piece and the sealing piece; for the flange sealing element, the quantitative influence rule of the hydrogen doping ratio, the working pressure, the environmental temperature, the bolt pretightening force, the size of the flange sealing element, the flange sealing surface form (plane and convex surface) and the type of sealing ring/sealing gasket materials (nitrile rubber, polytetrafluoroethylene rubber and metal wound gaskets) on the leakage rate can be researched; for the pipeline with the welding line, the quantitative influence rule of the hydrogen doping ratio, the working pressure, the environmental temperature, the pipeline size, the welding line size and the welding process on the leakage rate can be explored; for the valve, the quantitative influence rule of the hydrogen doping ratio, the working pressure, the ambient temperature, the size and the type of the valve, the size of a valve gasket and the type of materials on the leakage rate can be researched.
The second embodiment:
the embodiment provides a working method of a leakage rate detection experimental device for a hydrogen-doped pipeline connecting piece and a sealing piece, which comprises the following steps:
(1) and selecting a proper hydrogen loading proportion according to experimental requirements, displaying the pressure of the gas in the hydrogen loading gas cylinder in real time through a pressure gauge, and then boosting the pressure to a specified pressure through a high-pressure pump.
(2) The hydrogen-doped gas flow boosted by the high-pressure pump is filled to the flange sealing piece to be detected through the pipeline one-way valve, the pressure gauge and the pressure sensor, and the piece to be detected is placed in the high-low temperature box in order to change the environment temperature.
(3) For hydrogen, when a pressure difference method is adopted for detection, a vacuum pneumatic generator is adopted to reduce the pressure in a leakage detection pipe to vacuum, the pressure in the leakage detection pipe is increased due to gas leakage, pressure change in the leakage detection pipe is collected in real time through a negative pressure sensor to obtain leakage detection data, and a pressure-time curve is drawn; if the drainage method is adopted for detection, gas leaked from the to-be-detected piece flows through the detection pipe through the through hole and enters the measuring cup, the variation of the water level in the measuring cup is recorded, the rising volume of the liquid level is the volume of the leaked gas, and a volume-time curve is drawn.
(4) The experimental device is in the hydrogen-loading working condition, and in order to ensure safety, the valve through which the hydrogen flows is switched on and off by taking an air source as power. Valve pneumatic energy supply flow: the air gets into from prefabricated gas entry and compresses, for improve equipment's life, other impurity air-purifying are filtered through air diad to the air of compression, and the compressed air that purifies passes through relief pressure valve depressurization, shows air pressure through the manometer in real time, and air pressure gauge connects solenoid valve and pneumatic vacuum generator, and the air admission of the solenoid valve of flowing through gets into manual relief valve, provides power for the switch of manual relief valve and pneumatic vacuum generator.
(5) And when the experiment is finished, the hydrogen-loaded gas in the pipeline can be released by adopting a manual pressure release valve or an automatic pressure release valve, and the released gas can be returned to the hydrogen-loaded gas cylinder.
The high-pressure pump, the pneumatic vacuum generator and the digital display meter in the embodiment are all automatically controlled, so that the operation and the data recording are convenient.
In conclusion, the invention provides a set of process which can realize multifunctional experiments. Firstly, leakage rate detection experiments can be carried out on multiple components (flange sealing parts, pipelines and valves with welding seams); and secondly, a multi-factor coupling leakage detection experiment can be carried out, the sealing property of the sealing assembly is improved through research of obtained data, and the problem of safe hydrogen-loading/pure hydrogen conveying can be solved.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive changes in the technical solutions of the present invention.
Claims (10)
1. A leakage rate detection experimental device for a hydrogen-doped pipeline connecting piece and a sealing piece is characterized by comprising a high-low temperature box, a control unit, a pressure relief unit and a detection unit; the high-low temperature box is used for placing a piece to be detected, the gas supply unit is used for charging gas into the piece to be detected and comprises a gas inlet pipe, a stainless steel gas cylinder, a pressure gauge and an automatic stop valve, the stainless steel gas cylinder is used for storing hydrogen-doped gas, the gas inlet pipe is connected with the stainless steel gas cylinder, and the pressure gauge and the automatic stop valve are arranged on the gas inlet pipe; the control unit comprises a high-pressure pump, a pipeline one-way valve and a pressure sensor which are sequentially arranged on the air inlet pipe; the pressure relief unit is also arranged on the air inlet pipe; the detection unit is connected with the to-be-detected piece through a leakage pipe and used for detecting the leakage rate of gas.
2. The experimental device for detecting the leakage rate of the hydrogen loading pipeline connecting piece and the sealing piece as claimed in claim 1, wherein the pressure relief unit comprises a manual pressure relief valve and an automatic pressure relief valve which are connected in parallel, and the manual pressure relief valve and the automatic pressure relief valve are connected with the stainless steel gas cylinder through a pressure relief pipeline.
3. The experimental device for detecting the leakage rate of the hydrogen-loading pipeline connecting piece and the sealing piece as claimed in claim 1, further comprising a valve pneumatic energy supply unit, wherein the valve pneumatic energy supply unit comprises a pre-aeration inlet, an air doublet, a pressure reducing valve, an air pressure gauge and an electromagnetic valve which are sequentially connected, the electromagnetic valve is connected with a manual pressure relief valve, and the valve pneumatic energy supply unit provides aerodynamic force for the manual pressure relief valve and the vacuum pneumatic generator.
4. The experimental apparatus for testing the leakage rate of the connecting member and the sealing member of the hydrogen-loading pipeline according to claim 1, wherein the detecting unit comprises a drainage detecting unit and a pressure difference detecting unit.
5. The experimental device for detecting the leakage rate of the hydrogen-doped pipeline connecting piece and the sealing piece as claimed in claim 4, wherein the drainage detection unit comprises a leakage detecting pipe, a measuring cup and a water tank, the measuring cup is placed in the water tank, gas leaked from the to-be-detected piece flows through the leakage detecting pipe into the measuring cup through the through hole, the variation of the water level in the measuring cup is recorded, and the rising volume of the water level is the volume of the leaked gas.
6. The experimental apparatus for detecting the leakage rate of the hydrogen-doped pipe connecting piece and the sealing piece according to claim 4, wherein the pressure difference detection unit comprises a leakage detecting pipe, a negative pressure sensor, a vacuum valve and a pneumatic vacuum generator, the pneumatic vacuum generator reduces the pressure in the leakage detecting pipe to vacuum, the leakage gas increases the pressure in the leakage detecting pipe, and the pressure change in the leakage detecting pipe is collected in real time through the negative pressure sensor to obtain the leakage detection data.
7. The experimental apparatus for testing the leakage rate of hydrogen loading pipe connectors and seals as claimed in claim 6, wherein said pneumatic vacuum generator is further connected to a valve pneumatic energy supply unit, and the valve pneumatic energy supply unit is used for supplying energy to drive the pneumatic vacuum generator.
8. The experimental device for detecting the leakage rate of the hydrogen-loaded pipeline connecting piece and the sealing piece as claimed in claim 6, wherein the air inlet pipe is in threaded fit with the piece to be detected.
9. The experimental device for detecting the leakage rate of the hydrogen-loading pipeline connecting piece and the sealing piece as claimed in claim 6, wherein the leakage pipe is in threaded fit with the piece to be detected.
10. A method of operating a leak rate testing apparatus for hydrogen loaded pipe connectors and seals as claimed in any one of claims 1 to 9, comprising:
selecting a proper hydrogen loading proportion according to experimental requirements, displaying the pressure of gas in the stainless steel gas cylinder in real time through a pressure gauge, and then boosting the pressure to a specified pressure through a high-pressure pump;
the hydrogen-doped gas boosted by the high-pressure pump flows through a pipeline check valve, a pressure gauge and a pressure sensor and is filled into a piece to be detected, and the piece to be detected is placed in a high-low temperature box;
aiming at hydrogen, a drainage method detection unit and a pressure difference method detection unit are adopted for detection, detected data are transmitted to a processor in real time, and a volume-time curve and a pressure-time curve are drawn;
and (4) discharging the hydrogen-loaded gas in the pipeline by adopting a manual pressure release valve and an automatic pressure release valve after the experiment is finished, and returning the discharged gas to the hydrogen-loaded gas cylinder.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211606892.0A CN115876397A (en) | 2022-12-14 | 2022-12-14 | Testing device and method for detecting leakage rate of hydrogen-doped pipeline connecting piece and sealing piece |
| PCT/CN2023/103296 WO2024124860A1 (en) | 2022-12-14 | 2023-06-28 | Experimental device for measuring leakage rate of connecting member and sealing member of hydrogen-blended pipeline, and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211606892.0A CN115876397A (en) | 2022-12-14 | 2022-12-14 | Testing device and method for detecting leakage rate of hydrogen-doped pipeline connecting piece and sealing piece |
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| WO (1) | WO2024124860A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116380367A (en) * | 2023-06-06 | 2023-07-04 | 中国空气动力研究与发展中心超高速空气动力研究所 | Hydrogen leakage monitoring device and monitoring method for shock tube of high-pressure hydrogen driver |
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2022
- 2022-12-14 CN CN202211606892.0A patent/CN115876397A/en active Pending
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2023
- 2023-06-28 WO PCT/CN2023/103296 patent/WO2024124860A1/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116380367A (en) * | 2023-06-06 | 2023-07-04 | 中国空气动力研究与发展中心超高速空气动力研究所 | Hydrogen leakage monitoring device and monitoring method for shock tube of high-pressure hydrogen driver |
| CN116380367B (en) * | 2023-06-06 | 2023-08-01 | 中国空气动力研究与发展中心超高速空气动力研究所 | Hydrogen leakage monitoring device and monitoring method for shock tube of high-pressure hydrogen driver |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024124860A1 (en) | 2024-06-20 |
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