CN220490577U - Hydrogen circulation test system based on hydraulic pressure air tightness test - Google Patents

Abstract

The application discloses hydrogen circulation test system based on hydraulic pressure gas tightness test, this system includes: a hydrogen circulation test unit, a hydraulic pressure air tightness test unit and a connecting unit; the hydrogen circulation test unit comprises a cylinder body and a cover body, and the cylinder body is provided with a high-pressure cavity; the cover body is provided with a high-pressure channel, and the circumferential direction of the cover body is provided with a connecting hole corresponding to the first threaded hole; the fastening bolt is used for connecting the connecting hole and the first threaded hole, so that the cylinder body and the cover body are connected into a whole; the connecting unit is used for communicating the hydrogen circulation test unit and the hydraulic air tightness test unit, and the hydraulic air tightness test unit is used for detecting the pressure resistance of the hydrogen circulation test unit. The device has the advantages of simple structure, ingenious design and reasonable layout, and can rapidly, conveniently and reliably perform hydrogen circulation test on the plastic liner sample.

Description

Hydrogen circulation test system based on hydraulic pressure air tightness test

Technical Field

The application relates to a hydrogen circulation test system based on a water pressure air tightness test, and belongs to the technical field of compressed hydrogen plastic liner performance test equipment.

Background

The carbon fiber fully-wound gas cylinder (IV-type cylinder) with the compressed hydrogen plastic liner for the vehicle has the advantages of light weight, high pressure, high hydrogen storage density, fatigue resistance, corrosion resistance, long service life, low cost and the like, is an important development direction of the high-pressure hydrogen cylinder, is a development trend of energy storage equipment of a hydrogen fuel cell vehicle, and has wide application in internationally. Currently, IV type bottles have become hot spots for competing and pursuing in the gas bottle industry.

The nominal working pressure of the IV type bottle is 70MPa, and the plastic liner which is directly contacted with high-pressure hydrogen is easy to produce deterioration of physical property, mechanical property and permeability under the invasion of hydrogen due to high hydrogen storage pressure of the gas bottle and frequent hydrogen filling, so that serious potential safety hazard is caused. Therefore, a study on the compatibility of the liner material of the type IV bottle with hydrogen is necessary. In order to simulate the actual application state of the hydrogen cylinder in the filling and discharging process, a hydrogen circulation test means is constructed, and then quantitative and qualitative research on the hydrogen permeability of the plastic liner test piece subjected to the hydrogen circulation test is carried out. However, no special test device capable of realizing hydrogen circulation research on the material of the plastic liner exists in the market at present, and the device has the characteristics of high pressure resistance, high temperature resistance, low temperature resistance, fatigue resistance, good dynamic sealing performance and the like.

Therefore, it is necessary to develop a new hydrogen circulation test system.

The above description is in the technical field of knowledge, and does not necessarily constitute prior art.

Disclosure of Invention

In order to solve the problems, the application provides the hydrogen circulation test system based on the hydraulic air tightness test, which has the advantages of simple structure, ingenious design and reasonable layout, and can be used for rapidly, conveniently and reliably performing performance test on the plastic liner sample.

The technical scheme of the application is as follows:

a hydrogen circulation test device based on a hydraulic pressure air tightness test, comprising: the device comprises a hydrogen circulation test unit, a hydraulic air tightness test unit and a connecting unit for connecting the hydrogen circulation test unit and the hydraulic air tightness test unit;

the hydrogen cycle test unit includes:

the cylinder body is internally provided with a high-pressure cavity along the axial direction of the cylinder body, one end of the high-pressure cavity is a sealing end, the other end of the high-pressure cavity is an opening end, the side wall of the cylinder body is provided with a plurality of first threaded holes, the first threaded holes extend from the opening end to the direction of the sealing end, the first threaded holes are uniformly distributed along the circumferential direction of the opening end, or the plurality of first threaded holes are symmetrically distributed about the radial central axis of the opening end; the cover body is used for sealing the opening end, a high-pressure channel is formed in the cover body, and a connecting hole corresponding to the first threaded hole is formed in the circumferential direction of the cover body; the connecting hole is connected with the first threaded hole through a fastening bolt, so that the cylinder body and the cover body are connected into a whole;

the connecting unit comprises a connecting pipeline and a stop valve arranged on the connecting pipeline, one end of the connecting pipeline is communicated with the high-pressure channel, and the other end of the connecting pipeline is communicated with the hydraulic air tightness test unit;

the hydraulic air tightness test unit is used for detecting the pressure resistance of the hydrogen circulation test unit.

The hydrogen circulation test system is simple in structure, ingenious in design and reasonable in layout, and is designed according to the actual requirement of hydrogen circulation in the research of compatibility performance of IV-type bottle plastic liner materials and hydrogen, a cover body and a cylinder body are combined through a bolt structure, so that a high-pressure cavity is sealed, hydrogen is injected and discharged into the high-pressure cavity through a high-pressure channel, after the high-pressure hydrogen enters the high-pressure cavity, the high-pressure hydrogen can fully contact with a tested plastic liner sample, and an operator can control the discharge of the high-pressure hydrogen through an external system after the set pressure is reached; after the times of using conditions of simulating actual filling and discharging are required to be completed, the tested plastic liner sample is subjected to tests such as permeation or stretching, and the like, so that the related data of the compatibility of the plastic liner material and hydrogen are obtained. In addition, because the pressure resistance requirement on the hydrogen circulation test unit is higher, the pressure resistance test can be conveniently and directly carried out on the hydrogen circulation test unit by arranging the hydraulic pressure air tightness test unit and the connecting unit, so that the subsequent simulation of the actual filling and discharging of hydrogen is ensured to be carried out smoothly.

The cylinder body is connected through the bolt structure with the lid, fastening bolt and first screw hole cooperation are extended to the direction of its sealed end from the open end of cylinder body, this extending direction is parallel with the axial of cylinder body, when the atmospheric pressure in the high-pressure chamber is too big, the lid can receive great pressure, the direction of this pressure is parallel with the axial of cylinder body, so set up, make the pressure that the lid received even offset through the cooperation structure between a plurality of fastening bolts and the first screw hole, moreover the offset force that the cooperation structure produced between every fastening bolt and the first screw hole can carry out evenly distributed through the helicitic texture, thereby can avoid the cylinder body to receive the damage because of the local atress is too big, make whole test device have excellent high pressure resistance ability. Meanwhile, the test device can be quickly disassembled and assembled.

Preferably, the connecting hole may be a threaded hole, and the axis of the first threaded hole is disposed at an intermediate position between the inner side wall and the outer side wall of the cylinder body.

Optionally, the cover body further includes a first boss extending toward the inside of the high-pressure cavity, a radial dimension of the first boss is slightly smaller than a radial dimension of the high-pressure cavity, a first step is arranged on one side, close to the high-pressure cavity, of the first boss, a first annular groove is formed between the first step and the inner wall of the high-pressure cavity, and a first annular sealing element is arranged in the first annular groove;

the first step is connected with a first fixing piece, and the first fixing piece fixes the first annular sealing piece in the first annular groove.

Optionally, the hydrogen circulation test unit further comprises an adaptor, wherein a connecting channel is arranged in the adaptor, the connecting channel is used for communicating the connecting pipeline with the high-pressure channel, and the adaptor is arranged on the outer side of the cover body and is detachably connected with the cover body;

preferably, the adaptor is arranged on the central axis of the cover body, and the connecting channel is coaxially arranged with the high-pressure channel.

Optionally, the second screw hole has been seted up to the lid outside, the second screw hole with the coaxial line of high pressure channel sets up, the adaptor is equipped with to the screw thread post that the second screw hole extends, the screw thread post with the cooperation of second screw hole sets up.

Optionally, the threaded column of the adaptor further comprises a second boss extending towards the high-pressure channel, the radial size of the second boss is slightly smaller than the radial size of the corresponding high-pressure channel, the second boss is provided with a second step, a second annular groove is formed between the second step and the inner wall of the corresponding high-pressure channel, and a second annular sealing element is arranged in the second annular groove;

the second step is connected with a second fixing piece, and the second fixing piece fixes the second annular sealing piece in the second annular groove.

Optionally, the first fixing piece is detachably connected with the first step;

the second fixing piece is detachably connected with the second step.

Optionally, the first fixing piece is an annular baffle, and the annular baffle is connected with the first step through a bolt;

the second fixing piece is a locking cap, and the locking cap is connected with the second step through a bolt.

Optionally, the cylinder body and the cover body are made of stainless steel S31608.

Optionally, the sealing end of the high-pressure cavity is an arc-shaped curved surface, and the top of the arc-shaped curved surface faces the opposite direction of the opening end.

Optionally, the sealed end of the high pressure chamber is provided with a substrate.

Benefits that can be produced by the present application include, but are not limited to:

1. the utility model provides a hydrogen circulation test system based on hydraulic pressure airtight test, the cylinder body is connected through the bolt structure with the lid, fastening bolt and first screw hole cooperation are extended to its sealed end's direction from the open end of cylinder body, this extending direction is parallel with the axial of cylinder body, when the atmospheric pressure in the high-pressure chamber is too big, the lid can receive great pressure, the direction of this pressure is parallel with the axial of cylinder body, so set up, the pressure that the lid received can not only evenly offset through the cooperation structure between a plurality of fastening bolts and the first screw hole, moreover the offset force that the cooperation structure produced between every fastening bolt and the first screw hole can carry out evenly distributed through the helicitic texture, thereby can avoid the cylinder body to receive the damage because of the local atress is too big, make whole test device have excellent high pressure resistance. Meanwhile, the test device can be quickly disassembled and assembled.

2. The application provides a hydrogen circulation test system based on hydraulic pressure gas tightness test, seal structure between first boss and the high pressure chamber inner wall is first seal structure, and seal structure between adaptor and the lid is second seal structure, and double seal structure makes the higher dynamic seal nature and the reliability of having of whole hydrogen circulation test device.

Drawings

The accompanying drawings are included to provide a further understanding of the application, and are incorporated in and constitute a part of this application and are not to be construed as limiting the application. In the drawings:

FIG. 1 is a schematic diagram of a hydrogen circulation test system based on a hydraulic pressure tightness test according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a hydrogen circulation test unit according to an embodiment of the present application;

FIG. 3 is an axial cross-sectional view of a hydrogen circulation test unit according to an embodiment of the present application;

FIG. 4 is an enlarged schematic view of the structure of I in FIG. 3;

FIG. 5 is an enlarged schematic view of the structure II in FIG. 3;

FIG. 6 is a top view of a hydrogen circulation test device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a hydraulic airtight test unit according to an embodiment of the present application.

List of markers in fig. 1-6:

1. a cylinder body; 11. a high pressure chamber; 12. A first threaded hole; 13. An arc-shaped curved surface; 14. a substrate;

2. a cover body; 21. a high pressure passage; 22. a connection hole;

23. a first boss; 231. a first step; 232. a first annular groove; 233. a first annular seal; 234. a first fixing member;

24. an adapter; 241. a connection channel; 242. a threaded column;

25. a second boss; 251. a second step; 252. a second annular groove; 253. a second annular seal; 254. a second fixing member;

26. a second threaded hole;

3. a fastening bolt; 4. a plastic liner sample; 5. a base; 6. a hanging ring;

7. a hydraulic air tightness test unit; 8. a connecting unit 81, a connecting pipeline 82 and a stop valve;

list of markers in fig. 7:

(1) a control system; (2) a water tank; (3) a filter; (4) a pneumatic shut-off valve; (5) a one-way valve; (6) a pressure gauge; (7) detecting a pressure gauge; (8) a gas-liquid pump; (9) a pressure sensor; a gas storage tank;a manual shut-off valve; />A three-way valve; />A pneumatic throttle valve; />An oil mist device; />A manual adjustment valve; />A pneumatic safety valve; />A safety relief valve; />An electronic scale;/>an exhaust valve;a water jacket; />The bottle was inspected.

Detailed Description

In order that the objects, features and advantages of the present application will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced otherwise than as described herein, and thus the scope of the present application is not limited by the specific embodiments disclosed below.

In addition, the terms "first," "second," are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The embodiment of the application discloses a hydrogen circulation test system based on a hydraulic pressure air tightness test, which comprises a hydrogen circulation test unit, a hydraulic pressure air tightness test unit 7 and a connecting unit 8 for connecting the hydrogen circulation test unit and the hydraulic pressure air tightness test unit 7, as shown in fig. 1. Wherein, referring to fig. 2, 3 and 6, the hydrogen cycle test unit includes: the cylinder comprises a cylinder body 1 and a cover body 2, wherein a high-pressure cavity 11 is defined in the cylinder body 1 along the axial direction of the cylinder body, one end of the high-pressure cavity 11 is a sealing end, the other end of the high-pressure cavity 11 is an opening end, the cover body 2 is used for sealing the opening end of the cylinder body 1, a plurality of first threaded holes 12 are formed in the side wall of the cylinder body 1, the first threaded holes 12 extend from the opening end to the direction of the sealing end, namely the axial direction of the first threaded holes 12 is parallel to the axial direction of the high-pressure cavity 11, the first threaded holes 12 are uniformly distributed along the circumferential direction of the opening end, or the first threaded holes 12 are symmetrically distributed about the radial central axis of the opening end; the cover body 2 is provided with a high-pressure channel 21, the high-pressure channel 21 is used for communicating an external gas pipeline with the high-pressure cavity 11, and the circumferential direction of the cover body 2 is provided with a connecting hole 22 corresponding to the first threaded hole 12; the cylinder body 1 and the cover body 2 are connected into an integral structure through the connecting hole 22 and the first threaded hole 12 which are connected through the fastening bolt 3; the connecting unit 8 comprises a connecting pipeline 81 and a stop valve 82 arranged on the connecting pipeline 81, one end of the connecting pipeline 81 is communicated with the high-pressure channel 21, and the other end is communicated with the hydraulic air tightness test unit 7; the hydraulic pressure air tightness test unit 7 is used for detecting the pressure resistance of the hydrogen circulation test unit.

The high-pressure chamber 11 of the hydrogen circulation test unit is used for accommodating the plastic liner sample 4, after the plastic liner sample 4 is sealed in the hydrogen circulation test unit, the hydrogen circulation test unit simulates actual filling and discharging with the high-pressure channel 21, and after the number of times of using conditions required by the test to simulate the actual filling and discharging is completed, the tested plastic liner sample 4 is subjected to tests such as permeation or stretching, so that relevant data of the compatibility of the plastic liner sample 4 and hydrogen are obtained. Because the pressure resistance requirement on the hydrogen circulation test unit is higher, the pressure resistance test can be conveniently and directly carried out on the hydrogen circulation test unit by arranging the hydraulic pressure air tightness test unit 7 and the connecting unit 8, so that the subsequent simulation of the actual filling and discharging is ensured to be carried out smoothly.

In an embodiment, the high-pressure channel 21 penetrates through the cover body 2 along the central axis of the cover body 2, so that hydrogen passing through the high-pressure channel 21 from the outside is fully contacted with the tested plastic liner sample 4; the connecting hole 22 may be a threaded hole, and the fastening bolt 3 and the cover body 2 are in threaded connection, so that the influence of the arrangement of the connecting hole 22 on the air tightness of the high-pressure cavity 11 can be reduced, and the pressure applied to the nut of the fastening bolt 3 can be reduced.

The cylinder body 1 is connected with the cover body 2 through the bolt structure, fastening bolt 3 and first screw hole 12 cooperation are extended to the direction of its sealed end from the open end of cylinder body 1, this extending direction is parallel with the axial of cylinder body 1, when the atmospheric pressure in the high-pressure chamber 11 is too big, the cover body 2 can receive great pressure, the direction of this pressure is parallel with the axial of cylinder body 1, so set up, the pressure that the cover body 2 received can not only evenly offset through the cooperation structure between a plurality of fastening bolts 3 and the first screw hole 12, moreover, the offset force that the cooperation structure between every fastening bolt 3 and the first screw hole 12 produced can carry out evenly distributed through the helicitic texture, thereby can avoid cylinder body 1 to receive the damage because of the local atress is too big, make whole test device have excellent high pressure resistance. Meanwhile, the test device can be quickly assembled and disassembled.

The hydrogen circulation test device is simple in structure, ingenious in design and reasonable in layout, and is designed according to the actual requirement of hydrogen circulation in the research of compatibility performance of IV-type bottle plastic liner materials and hydrogen, the cover body 2 and the cylinder body 1 are combined by utilizing a bolt structure, so that the high-pressure cavity 11 is sealed, hydrogen is injected and discharged into the high-pressure cavity 11 through the high-pressure channel 21, the high-pressure hydrogen fully contacts with the tested plastic liner sample 4 after entering the high-pressure cavity 11, and an operator can control the discharge of the high-pressure hydrogen through an external system after reaching a set pressure; after the number of times of using conditions simulating actual filling and discharging is required by the test, the tested plastic liner sample 4 is subjected to tests such as permeation or stretching, and the like, so that the related data of the compatibility of the plastic liner sample 4 and hydrogen are obtained.

In an embodiment, as shown in fig. 3, the axis of the first screw hole 12 is provided at an intermediate position between the inner side wall and the outer side wall of the cylinder body 1, so that the distance from the axis of the first screw hole 12 to the inner side wall of the cylinder body 1 is the same as the distance from the axis of the first screw hole 12 to the outer side wall of the cylinder body 1, so that the force generated between the first screw hole 12 and the fastening bolt 3 can be uniformly dispersed in the radial direction of the cylinder body 1.

Because this hydrogen circulation test device needs often to dismantle, for improving the wear resistance of first screw hole 12, extension first screw hole 12 live time installs the thread bush in first screw hole 12 for fastening bolt 3 passes through the thread bush and is connected with first screw hole 12, can effectively reduce first screw hole 12 and fastening bolt 3 because of the friction number of times that often dismantle the production, when the internal thread of thread bush and the external screw thread of fastening bolt 3 are worn and torn, only need change thread bush and fastening bolt 3 can, need not to change whole cylinder body 1 because of the wearing and tearing of first screw hole 12.

Further, when the connection hole 22 is a threaded hole, a threaded sleeve may be disposed in the connection hole 22.

In an embodiment, as shown in fig. 3 and fig. 4, in order to improve the air tightness of the whole device, the cover body 2 further includes a first boss 23 extending towards the inside of the high-pressure chamber 11, and the radial size of the first boss 23 is slightly smaller than the radial size of the high-pressure chamber 11, so that the inner wall of the high-pressure chamber 11 on the side wall of the first boss 23 is in interference fit, and the contact area between the cover body 2 and the cylinder body 1 is increased due to the arrangement of the first boss 23, and meanwhile, a corner is formed between the cover body 2 and the cylinder body 1, so that the air tightness of the whole device is effectively improved. In addition, the first boss 23 may also increase the thickness of the bearing area of the cover, and improve the bearing capacity of the cover.

Further, referring to fig. 3 and 4, a first step 231 is disposed on a side of the first boss 23 near the high pressure chamber 11, a first annular groove 232 is formed between the first step 231 and the inner wall of the high pressure chamber 11, a first annular seal member 233 is disposed in the first annular groove 232, the first annular seal member 233 is usually made of rubber, but is not limited to rubber, and the dynamic tightness of the whole device can be effectively improved due to the arrangement of the first annular seal member 233.

Further, since the apparatus is frequently disassembled, in order to prevent the first annular sealing member 233 from being separated from the first step 231 during the disassembly, a first fixing member 234 is coupled to the first step 231, and the first fixing member 234 fixes the first annular sealing member 233 in the first annular groove 232.

As an embodiment, the first fixing member 234 is an annular baffle plate adapted to the high-pressure chamber 11, and the middle position of the annular baffle plate is provided for hydrogen to pass through, and the annular baffle plate is detachably connected with the first boss 23 through a bolt, so that the first annular sealing member 233 can be conveniently replaced.

Further, at least two bolts are arranged between the annular baffle plate and the first boss 23, and are uniformly distributed on the periphery of the annular baffle plate.

The hydrogen circulation test device further comprises an adapter 24, a connecting channel 241 is arranged in the adapter 24, the connecting channel 241 is used for communicating a gas pipeline with the high-pressure channel 21, the adapter 24 is arranged on the outer side of the cover body 2, the external gas pipeline needs to be detached from the adapter 24 frequently, and the adapter 24 is easy to wear, therefore, in the embodiment, the adapter 24 and the cover body 2 are detachably connected, specifically, the adapter 24 is arranged on the central axis of the cover body 2, the connecting channel 241 is coaxially arranged with the high-pressure channel 21, a second threaded hole 26 is formed on the outer side of the cover body 2, the second threaded hole 26 is coaxially arranged with the high-pressure channel 21, the adapter 24 is provided with a threaded column 242 extending towards the second threaded hole 26, and the threaded column 242 is matched with the second threaded hole 26. The adapter 24 is connected with the cover body 2 through the threaded column and the threaded hole, so that the disassembly and replacement of the adapter 24 are convenient, and the air tightness of the whole device can be improved.

In order to further improve the air tightness of the whole device, as shown in fig. 3 and 5, the threaded post 242 of the adaptor 24 further includes a second boss 25 extending toward the high pressure channel 21, the radial dimension of the second boss 25 is slightly smaller than the radial dimension of the corresponding high pressure channel 21, the second boss 25 is provided with a second step 251, a second annular groove 252 is formed between the second step 251 and the inner wall of the corresponding high pressure channel 21, a second annular seal 253 is disposed in the second annular groove 252, the second annular seal 253 is usually made of rubber, but is not limited to rubber, and the arrangement of the second annular seal 253 can further improve the dynamic tightness of the whole device.

Further, to prevent the second annular seal 253 from being separated from the second step 251, the second step 251 is connected with a second fixing member 254, and the second fixing member 254 fixes the second annular seal 253 in the second annular groove 252.

As an embodiment, the second fixing member 254 is a locking cap, and a through hole is formed in the middle of the locking cap to communicate the high pressure channel 21 with the connection channel 241 of the adaptor 24, and the locking cap is connected to the second boss 25 by bolts, so as to facilitate replacement of the second annular sealing member 253.

The sealing structure between the first boss 23 and the inner wall of the high-pressure cavity 11 is a first sealing structure, the sealing structure between the adapter 24 and the cover body 2 is a second sealing structure, and the double sealing structure enables the whole hydrogen circulation test device to have higher dynamic sealing performance and reliability.

As an implementation mode, the cylinder body and the cover body are made of stainless steel S31608, the stainless steel S31608 meets the standard NB/T47010, the cylinder body and the cover body are widely applied to the fields of aerospace, land, ocean and the like, and after the surface of the S31608 is naturally passivated, the cylinder body and the cover body have high wear resistance.

In one embodiment, the sealed end of the high pressure chamber 11 is an arcuate curved surface 13, and as shown in fig. 3, the top of the arcuate curved surface 13 faces in the opposite direction of the open end. The curved surface 13 may be a dish shape, a part of a spherical curved surface, or other types of curved surfaces, and is not limited herein, and the design of the curved surface 13 can improve the alternating load resistance and durability of the whole device and prevent the concentration of internal stress. Further, the sealing end of the high-pressure cavity 11 is provided with the substrate 14, when the whole device is used, the sealing end of the cylinder body 1 faces downwards, the opening end faces upwards, and in order not to influence the deformation of the plastic liner sample 4 in the high-pressure cavity 11, the substrate 14 is added to ensure that the plastic liner sample 4 is stably placed in the high-pressure cavity 11, and the accuracy of test result parameters is ensured.

The bottom of the cylinder body 1 is provided with a base 5 extending to the outer circumference, and as shown in fig. 2 and 3, the circumference of the base 5 is uniformly provided with a plurality of screw holes to facilitate the fixation of the cylinder body 1. Further, the projection of the first threaded hole 12 on the bottom of the cylinder body 1 and the dislocation distribution of the threaded holes on the base 5 further disperse the force born by the cylinder body 1.

The outside of lid 2 is provided with rings 6, and as shown in fig. 2 and 3, uses the hoist to steadily install lid 2 to cylinder body 1 through connecting rings 6, specifically, the outside of lid 2 sets up two rings at least, rings even setting up the circumference of lid.

As an implementation mode, the hydraulic air tightness test unit can be a hydraulic test module, the hydraulic test module comprises a control system, a pressure sensor, a water tank, a pressure pump, a connecting pipeline and a detection bottle, the connecting pipeline can be communicated with a connecting pipeline of the connecting unit, the detection bottle is used for containing the hydrogen circulation test unit and/or the connecting unit, the pressure pump provides pressure to press water in the water tank into the connecting unit through the connecting pipeline, then the water is pressed into a high-pressure cavity of the hydrogen circulation test unit through the connecting unit, and then the water pressure resistance performance test is carried out on the hydrogen circulation test unit. The control system is used for controlling the work of the pressure pump, and can receive and process feedback signals of the pressure sensor to adjust the pressure generated by the pressure pump.

As an implementation mode, the hydraulic air tightness test unit can be an air tightness test module, the air tightness test module comprises a control system, a pressure sensor, an air storage tank, a pressure pump, a connecting pipeline and a detection bottle, the connecting pipeline can be communicated with a connecting pipeline of the connecting unit, the detection bottle is used for containing the hydrogen circulation test unit and/or the connecting unit, the pressure pump provides pressure to press air in the air storage tank into the connecting unit through the connecting pipeline, then the air is pressed into a high-pressure cavity of the hydrogen circulation test unit through the connecting unit, and then air tightness performance test is carried out on the hydrogen circulation test unit. The control system is used for controlling the work of the pressure pump, and can receive and process feedback signals of the pressure sensor to adjust the pressure generated by the pressure pump.

In another embodiment, referring to fig. 2 and 7, the hydraulic air tightness test unit 7 includes a control system (1), a pressure sensor (9), an air storage tank, a water tank (2), a gas-liquid pump (8), and a detection bottle. The gas storage tank (8) is provided with a gas source, the gas drive liquid pump (8) generates mechanical energy through compressed gas and is used for driving liquid to be pumped, the water tank (2) presses liquid water into the connecting unit (8) through the gas drive liquid pump (8), then the water is pressed into the high-pressure cavity (11) of the hydrogen circulation test unit through the connecting unit (8), and then the water pressure resistance performance test is carried out on the hydrogen circulation test unit. Detection bottle->For housing a hydrogen circulation test unit and/or a connection unit. The pressure sensor (9) can be arranged on a connecting pipeline between the gas-liquid-driving pump (8) and the connecting unit 8 and is used for testing the pressure of liquid flowing into the hydrogen circulation test unit, then the detected pressure signal is transmitted to the control system (1), and the control system (1) can receive and process the feedback signal of the pressure sensor (9) to adjust the pressure generated by the gas-liquid-driving pump (8). The hydraulic air tightness test unit has the advantages of simple structure, no spark generation, safety and reliability.

Further, the pipeline at the input end and the pipeline at the output end of the air storage tank cavity of the hydraulic air tightness test unit 7 are respectively provided with a filter (3) so as to ensure the purity of the air; in addition, a water outlet pipe of a water tank (2) of the hydraulic air tightness test unit is also provided with a filter (3) so as to ensure the purity of liquid water.

Further, a pneumatic safety valve (4) and a manual stop valve are also arranged on a communication pipeline from the air storage tank of the hydraulic air tightness test unit 7 to the air drive liquid pump (8)Three-way valve->Manual control valve->Pneumatic throttle valve->Oil mist device->Pneumatic throttle valve->And a one-way valve (5); a pneumatic stop valve (4) and a one-way valve (5) are arranged on a communication pipeline between the water tank (2) and the gas-liquid pump (8); a one-way valve (5), a pressure sensor (9), a pressure gauge (6) and a detection pressure gauge (7) are arranged between the gas-liquid pump (8) and the connecting unit 8.

Further, a detection bottle of the hydraulic air tightness test unit 7 is connected with an electronic scaleElectronic scale->With detecting bottleA manual stop valve is arranged between the two>When the water pressure resistance of the hydrogen circulation test unit is tested, the amount of water exuded by the hydrogen circulation test unit can be detected, and the electronic scale is +.>Is connected with the control system (1) to transmit the collected data to the control system (1). The detection bottle is provided with an exhaust valve->Safety relief valve->And water jacket->To ensure the arrangement of the test vials.

The structure of the hydraulic pressure air tightness test unit is not limited to the above structure, and may be other types as long as the test of the pressure resistance and air tightness of the hydrogen circulation test unit can be realized.

The whole hydrogen circulation test system has the advantages of simple structure and low manufacturing cost, so that the hydrogen circulation test system has a plurality of advantages, is particularly suitable for popularization and application in the field, and has very broad market prospect.

In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.

The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.

Claims (10)

1. A hydrogen circulation test system based on a hydraulic pressure gas tightness test, comprising: the device comprises a hydrogen circulation test unit, a hydraulic air tightness test unit and a connecting unit for connecting the hydrogen circulation test unit and the hydraulic air tightness test unit;

the hydrogen cycle test unit includes:

the cylinder body is internally provided with a high-pressure cavity along the axial direction of the cylinder body, one end of the high-pressure cavity is a sealing end, the other end of the high-pressure cavity is an opening end, the side wall of the cylinder body is provided with a plurality of first threaded holes, the first threaded holes extend from the opening end to the direction of the sealing end, the first threaded holes are uniformly distributed along the circumferential direction of the opening end, or the plurality of first threaded holes are symmetrically distributed about the radial central axis of the opening end; and

the cylinder comprises a cylinder body, a first threaded hole, a second threaded hole, a cover body, a connecting hole, a connecting bolt and a connecting rod, wherein the cover body is used for sealing the opening end, the cover body is provided with a high-pressure channel, the periphery of the cover body is provided with the connecting hole corresponding to the first threaded hole, and the connecting hole is connected with the first threaded hole through the connecting bolt, so that the cylinder body and the cover body are connected into a whole;

the connecting unit comprises a connecting pipeline and a stop valve arranged on the connecting pipeline, one end of the connecting pipeline is communicated with the high-pressure channel, and the other end of the connecting pipeline is communicated with the hydraulic air tightness test unit;

the hydraulic air tightness test unit is used for detecting the pressure resistance of the hydrogen circulation test unit.

2. The hydrogen circulation test system based on the hydraulic pressure air tightness test according to claim 1, wherein the cover body further comprises a first boss extending to the inside of the high-pressure cavity, the radial size of the first boss is slightly smaller than the radial size of the high-pressure cavity, a first step is arranged on one side, close to the high-pressure cavity, of the first boss, a first annular groove is formed between the first step and the inner wall of the high-pressure cavity, and a first annular sealing piece is arranged in the first annular groove;

the first step is connected with a first fixing piece, and the first fixing piece fixes the first annular sealing piece in the first annular groove.

3. The hydrogen circulation test system based on the hydraulic pressure air tightness test according to claim 2, wherein the hydrogen circulation test unit further comprises an adapter, a connecting channel is arranged in the adapter, the connecting channel is used for communicating the connecting pipeline with the high-pressure channel, and the adapter is arranged on the outer side of the cover body and is detachably connected with the cover body;

the adapter is arranged on the central axis of the cover body, and the connecting channel and the high-pressure channel are coaxially arranged.

4. The hydrogen circulation test system based on the hydraulic pressure air tightness test according to claim 3, wherein a second threaded hole is formed in the outer side of the cover body, the second threaded hole is coaxially arranged with the high-pressure channel, the adapter is provided with a threaded column extending towards the second threaded hole, and the threaded column is matched with the second threaded hole.

5. The hydraulic air tightness test based hydrogen circulation test system according to claim 4, wherein the threaded column of the adapter further comprises a second boss extending towards the high pressure channel, the radial dimension of the second boss is slightly smaller than the radial dimension of the corresponding high pressure channel, the second boss is provided with a second step, a second annular groove is formed between the second step and the inner wall of the corresponding high pressure channel, and a second annular sealing piece is arranged in the second annular groove;

the second step is connected with a second fixing piece, and the second fixing piece fixes the second annular sealing piece in the second annular groove.

6. The hydrogen circulation test system based on the hydraulic pressure gas tightness test according to claim 5, wherein,

the first fixing piece is detachably connected with the first step;

the second fixing piece is detachably connected with the second step.

7. The hydraulic air tightness test based hydrogen circulation test system according to claim 6, wherein the first fixing member is an annular baffle plate, and the annular baffle plate is connected with the first step through bolts;

the second fixing piece is a locking cap, and the locking cap is connected with the second step through a bolt.

8. The hydraulic air tightness test-based hydrogen circulation test system according to claim 1, wherein the cylinder body and the cover are made of stainless steel S31608.

9. The hydraulic air tightness test-based hydrogen circulation test system according to claim 1, wherein the sealed end of the high pressure chamber is an arc-shaped curved surface, and the top of the arc-shaped curved surface faces the opposite direction of the open end.

10. The hydraulic air tightness test-based hydrogen circulation test system according to claim 1, wherein the sealed end of the high pressure chamber is provided with a substrate.