Medium flow control device for gas cylinder limiting temperature and pressure cyclic fatigue test

Abstract

The invention belongs to the technical field of safety inspection and detection of special equipment, and particularly relates to a gas cylinder limiting temperature and pressure cyclic fatigue test medium flow control device which comprises an inflation and deflation pipe, a gas cylinder limiting temperature and pressure cyclic fatigue test medium flow control device, a gas cylinder limiting temperature and pressure cyclic fatigue test medium flow control device and a gas cylinder limiting temperature and pressure cyclic fatigue test medium flow control device, a first pipe opening and a second pipe opening are formed in the charging and discharging pipe, and one-way mechanisms are arranged between the connecting pipe and the first pipe opening and between the connecting pipe and the second pipe opening. The first pipe opening and the second pipe opening communicate with the connecting pipe, and the opening directions of the two one-way mechanisms are opposite. During use, the first pipe orifice and the second pipe orifice are both located in the gas cylinder. The purpose of the invention is as follows: through the mutual cooperation of the charging and discharging pipe, the first pipe orifice, the first one-way mechanism, the second pipe orifice and the second one-way mechanism, an experimental medium enters and exits from the pipe orifices at different positions of the gas cylinder, so that the experimental medium flows in the gas cylinder, and the temperature of the medium in the gas cylinder is relatively balanced through the flowing of the experimental medium; therefore, the temperature difference of the gas cylinder body is reduced, and the experiment precision is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of special equipment safety inspection and detection, and particularly relates to a medium flow control device for a gas cylinder limit temperature and pressure cycle fatigue test. BACKGROUND

[0002] Hydrogen energy is considered as a key technology to solve energy shortage and environmental pollution due to its clean and efficient characteristics. The rapid development of hydrogen fuel cell vehicles has promoted the research and application of high-pressure hydrogen storage technology. High-pressure hydrogen storage technology refers to a technology of compressing hydrogen at high pressure and storing it in a hydrogen storage cylinder in the form of high-density gas. The pressure of the hydrogen storage cylinder is generally 35-70 MPa. The composite liner carbon fiber full-winding gas cylinder has become an urgent demand for large-scale popularization and use of hydrogen fuel electric vehicles due to its light weight, large capacity, corrosion resistance and other advantages.

[0003] However, the safety performance of the composite high-pressure hydrogen storage cylinder becomes a bottleneck for popularization and application due to the flammable and explosive characteristics of hydrogen. When the gas cylinder is subjected to extreme pressure and temperature fluctuations during repeated hydrogen charging and discharging, material progressive damage, crack propagation and other problems may occur, affecting the fatigue life. First, the gas may diffuse outwardly to the liner at high pressure, causing hydrogen leakage, and cracks or bulges may occur in the liner during charging or discharging, reducing the sealing performance of the hydrogen storage cylinder and shortening the service life of the cylinder. In addition, the temperature of the hydrogen storage cylinder changes in the range of -40-85℃ during charging and discharging. If the low-temperature impact resistance of the plastic liner is not enough, the brittleness of the plastic liner will increase at low temperature, which will also reduce the service life of the hydrogen storage cylinder.

[0004] Therefore, the composite high-pressure hydrogen storage cylinder needs to be verified for long-term reliability through a limit temperature and pressure cycle fatigue test. In the existing test process, the cylinder is placed in a high / low temperature environment chamber, and a pipeline is connected to the cylinder mouth to repeatedly charge and discharge the same temperature liquid medium into the cylinder to achieve the purpose of temperature and pressure cycle fatigue test of the cylinder.

[0005] However, in the existing test process, the pipelines for charging and discharging the medium are directly connected to the cylinder mouth. When charging, the temperature of the medium at the cylinder mouth and the cylinder bottom increases due to the pressure, while when discharging, only the medium near the cylinder mouth pipeline flows out, and the medium in the entire test cylinder does not participate in the cycle. Long-term cycle fatigue test makes the temperature at the cylinder mouth and the cylinder bottom higher than that at other positions, the temperature distribution is uneven, and a temperature difference is formed in the cylinder, which affects the accuracy of the experiment and the test effect. SUMMARY

[0006] The purpose of this invention is to provide a medium flow control device for a gas cylinder extreme temperature pressure cyclic fatigue test. Through the cooperation of the filling and discharging pipe, the first port, the first one-way mechanism, the second port, and the second one-way mechanism, the test medium enters and exits through the ports located at different positions in the gas cylinder, thereby causing the test medium to flow in the gas cylinder. The flow of the test medium makes the temperature of the medium inside the gas cylinder relatively uniform, thereby reducing the temperature difference in the gas cylinder body and improving the accuracy of the experiment.

[0007] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0008] A device for controlling the flow of a medium in a gas cylinder under extreme temperature and pressure cyclic fatigue test includes:

[0009] A filling / discharging tube that can extend from the mouth of the gas cylinder to the bottom of the gas cylinder and is connected to the connecting tube;

[0010] The charging / discharging tube has a first port at the end away from the connecting tube, and a first one-way mechanism is provided between the connecting tube and the first port;

[0011] The charging / discharging tube has a second port at one end near the connecting tube, and a second one-way mechanism is provided between the connecting tube and the second port;

[0012] Both the first and second ports are connected to the connecting pipe, and the opening directions of the first and second one-way mechanisms are opposite.

[0013] During use, both the first and second inlets are located inside the gas cylinder.

[0014] Further specified, the charging / discharging tube is provided with a first channel, one end of the first channel is connected to the connecting tube, and the other end forms a first tube opening;

[0015] The end of the charging / discharging tube near the connecting tube has a second channel, and the free end of the second channel forms a second port that communicates with the outer wall of the charging / discharging tube.

[0016] This structural design, by setting a first channel and a second channel on the filling and discharging tube, enables the connection between the connecting tube and different positions in the gas cylinder. The structure is simple, easy to use, and highly practical.

[0017] Furthermore, there are multiple second channels, and these multiple second channels are evenly distributed circumferentially along the central axis of the charging / discharging tube.

[0018] This structural design, through multiple axially evenly arranged second channels, can reduce the diameter of a single second channel while ensuring the overall flow rate of the return channel, thereby ensuring the structural strength of the charging and discharging tube, making it highly practical.

[0019] Further specified, when the pressure is increased, the connecting pipe fills the gas cylinder with the experimental medium, the first one-way mechanism is in the open state, and the second one-way mechanism is in the closed state;

[0020] When the pressure is released, as the experimental medium from the gas cylinder flows out through the connecting pipe, the second one-way mechanism is in the open state, and the first one-way mechanism is in the closed state.

[0021] This structural design, by setting the first one-way mechanism to open when the connecting pipe fills the gas cylinder with experimental medium, that is, by setting the first pipe opening as the outlet for the experimental medium to enter the gas cylinder from the filling and discharging pipe, and the second pipe opening as the inlet for the experimental medium to flow back to the filling and discharging pipe, can control the delivery of the experimental medium to the bottom of the gas cylinder and then out of the cylinder opening. The structure is simple, easy to install, and highly practical.

[0022] Further specified, the outer wall of the charging / discharging tube near the connecting tube end is provided with an annular groove, and the second tube opening is located inside the annular groove;

[0023] The charging and discharging tube is fitted with an annular filter screen inside the annular groove, and the second tube opening is located inside the annular filter screen.

[0024] One end of the annular filter screen rests against the end of the annular groove, and the other end rests against the end of the connecting pipe.

[0025] This structural design, by creating an annular groove at the second inlet of the connecting pipe and installing an annular filter screen within the groove, can filter the experimental medium entering the second channel from the gas cylinder, thereby preventing blockage of the second one-way mechanism and making it highly practical. At the same time, the cooperation between the annular groove, the annular filter screen, and the connecting pipe allows for direct compression of the annular filter screen by the connecting pipe, making installation more convenient.

[0026] Further specified, the first one-way mechanism includes a first valve ball, a first compression spring, and a first retaining ring;

[0027] The charging / discharging tube has a first secondary channel at the end away from the connecting tube. The first secondary channel is coaxially arranged with the first channel, and the diameter of the first secondary channel is larger than the diameter of the first channel.

[0028] A first conical wall is provided between the first auxiliary channel and the first channel, and the top of the first valve ball rests against the first conical wall;

[0029] The first fixing ring is fixedly installed inside the first auxiliary channel, and the first compression spring is located between the first fixing ring and the first valve ball.

[0030] This structural design, through the cooperation of the first valve ball, the first compression spring, the first fixing ring and the first conical wall, forms the first one-way mechanism, which is simple in structure, easy to install and has strong stability.

[0031] Further specifying, the second one-way mechanism includes a second valve ball, a second compression spring, and a second retaining ring;

[0032] The charging / discharging tube has a second auxiliary channel at one end near the connecting tube. The second auxiliary channel is coaxially arranged with the second channel, and the diameter of the second auxiliary channel is larger than the diameter of the second channel.

[0033] A second conical wall is provided between the second auxiliary channel and the second channel, and the top of the second valve ball rests against the second conical wall;

[0034] The second fixing ring is fixedly installed inside the second auxiliary channel, and the second compression spring is located between the second fixing ring and the second valve ball.

[0035] This structural design, through the cooperation of the second valve ball, the second compression spring, the second fixing ring and the second conical wall, forms a second one-way mechanism. It has a simple structure, is easy to install and has strong stability.

[0036] Further specifying, the charging / discharging tube includes a main body and an extension tube;

[0037] The main body is connected to the connecting pipe;

[0038] The extension tube is detachably connected to the main body, and the first tube opening is opened on the extension tube;

[0039] The second opening is located on the main body.

[0040] This structural design, with its detachable extension tube, allows for the installation of extension tubes of different lengths for gas cylinders of varying sizes, thus enhancing the applicability of the filling and discharging tube and making it highly versatile.

[0041] Furthermore, a reversing mechanism is installed at the end of the charging / discharging tube furthest from the connecting tube;

[0042] The deflection mechanism is used to deflect the experimental medium ejected from the first nozzle towards the nozzle inside the gas cylinder.

[0043] This structural design, through the deflection mechanism, deflects the experimental medium ejected from the first nozzle at the bottom of the gas cylinder towards the cylinder opening. This allows the experimental medium, which has heated up due to pressurization, to flow towards the cylinder opening at a faster speed. During multiple filling and discharging cycles, the medium circulates between the gas cylinder and the filling and discharging pipe, resulting in a more uniform temperature of the medium in the gas cylinder and strong practicality.

[0044] Furthermore, the reversing mechanism has a blind hole at the end near the charging / discharging tube;

[0045] The reversing mechanism includes an integrally formed reversing head and a mounting column;

[0046] The folding head is provided with multiple folding holes that communicate with blind holes, and the folding holes are inclined from the inside to the outside towards the bottle mouth;

[0047] The mounting post is screwed onto the charging / discharging tube.

[0048] This structural design, through the setting of blind holes and folding holes, forms a folding mechanism, which is simple in structure, easy to install, and highly practical.

[0049] The invention employing the above technical solution has the following advantages:

[0050] 1. Through the cooperation of the filling and discharging tube, the first port, the first one-way mechanism, the second port, and the second one-way mechanism, the experimental medium is filled and discharged into the gas cylinder through the connecting tube. When filling the experimental medium, the experimental medium enters the gas cylinder from one of the ports. When discharging the experimental medium, it leaves the gas cylinder from the other port. During this process, the experimental medium flows in the gas cylinder, which in turn drives the experimental medium that has risen in temperature due to pressurization to flow in the gas cylinder. This makes the temperature of the medium in the gas cylinder relatively uniform, thereby reducing the temperature difference of the gas cylinder body and improving the accuracy of the experiment.

[0051] 2. By setting a first channel and a second channel on the filling and discharging tube, the connection tube can be connected to different positions in the gas cylinder. The structure is simple, easy to use, and highly practical.

[0052] 3. By setting the first one-way mechanism to open when the connecting pipe fills the gas cylinder with the experimental medium, that is, by setting the first pipe opening as the outlet for the experimental medium to enter the gas cylinder from the filling and discharging pipe, and the second pipe opening as the inlet for the experimental medium to flow back to the filling and discharging pipe, the experimental medium can be controlled to be delivered to the bottom of the gas cylinder and then flow out from the opening. The structure is simple, easy to install, and highly practical.

[0053] 4. With the detachable extension tube, extension tubes of different lengths can be installed for gas cylinders of different lengths, enhancing the applicability of the filling and discharging tube and making it highly adaptable.

[0054] 5. The experimental medium ejected from the first nozzle is deflected at the bottom of the gas cylinder towards the cylinder opening by the reversing mechanism. This allows the experimental medium, which has heated up due to pressurization, to flow towards the cylinder opening at a faster speed. During multiple filling and discharging cycles, the medium circulates between the gas cylinder and the filling and discharging pipe, resulting in a more uniform temperature of the medium in the gas cylinder and making it highly practical. Attached Figure Description

[0055] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0056] Figure 1This is a schematic diagram of an embodiment of the medium flow control device for extreme temperature and pressure cyclic fatigue testing of gas cylinders according to the present invention.

[0057] Figure 2 This is a schematic diagram of the structure of the medium flow control device for extreme temperature and pressure cyclic fatigue testing of a gas cylinder according to the present invention, in its usage state.

[0058] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0059] Figure 4 for Figure 3 Enlarged structural diagram at point B;

[0060] Figure 5 for Figure 2 Enlarged structural diagram at point C;

[0061] The symbols for the main components are explained below:

[0062] Gas cylinder 1, cylinder mouth 10

[0063] Charging / discharging tube 2, connecting tube 20,

[0064] First channel 21, first secondary channel 210, first valve ball 211, first compression spring 212, first retaining ring 213

[0065] Second channel 22, second auxiliary channel 220, second valve ball 221, second compression spring 222, second retaining ring 223

[0066] 23. Main body; 24. Extension tube; 25. Annular filter screen.

[0067] 3. Turnback mechanism, 31. Turnback head, 32. Mounting column, 320. Blind hole, 33. Detailed Implementation

[0068] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that similar or identical parts are referred to by the same reference numerals in the drawings or description. Implementations not shown or described in the drawings are forms known to those skilled in the art. In addition, directional terms mentioned in the embodiments, such as "up," "down," "top," "bottom," "left," "right," "front," and "back," are only for reference to the directions in the drawings and are not intended to limit the scope of protection of the present invention.

[0069] like Figures 1-5 As shown, the present invention provides a medium flow control device for a gas cylinder extreme temperature and pressure cyclic fatigue test, comprising:

[0070] A filling / discharging pipe 2 that can extend from the mouth 10 of the gas cylinder 1 to the bottom of the gas cylinder 1 and is connected to the connecting pipe 20;

[0071] The end of the charging / discharging tube 2 away from the connecting tube 20 is provided with a first port, and a first one-way mechanism is provided between the connecting tube 20 and the first port;

[0072] The charging / discharging pipe 2 has a second port at one end near the connecting pipe 20, and a second one-way mechanism is provided between the connecting pipe 20 and the second port;

[0073] Both the first and second ports are connected to the connecting pipe 20, and the opening directions of the first and second one-way mechanisms are opposite.

[0074] When in use, both the first and second inlets are located inside gas cylinder 1.

[0075] The charging / discharging tube 2 is provided with a first channel 21, one end of which is connected to the connecting tube 20 and the other end forms a first tube opening;

[0076] The end of the charging / discharging tube 2 near the connecting tube 20 has a second channel 22, and the free end of the second channel 22 forms a second port that communicates with the outer wall of the charging / discharging tube 2.

[0077] In practice, depending on the actual situation, the filling and discharging pipe 2 can be composed of two pipes, one long and one short. The end of the long pipe serves as the first port, which can be inserted into the bottom of the gas cylinder 1, and the end of the short pipe serves as the second port, located at the end of the gas cylinder 1 near the mouth 10. In this embodiment, by setting a first channel 21 and a second channel 22 on the filling and discharging pipe 2, the connection between the connecting pipe 20 and different positions in the gas cylinder 1 can be achieved. The structure is simple, easy to use, and highly practical.

[0078] The second channel 22 is L-shaped.

[0079] In practice, depending on the actual situation, the second channel 22 can also be set as an inclined straight line. This embodiment has a simple structure, is easy to manufacture, and is highly practical.

[0080] There are multiple second channels 22, and the multiple second channels 22 are evenly distributed circumferentially along the central axis of the charging and discharging tube 2.

[0081] In practice, depending on the actual situation, only one second channel 22 with a sufficient diameter can be set. In this embodiment, multiple second channels 22 are evenly arranged axially, which can reduce the diameter of a single second channel 22 while ensuring the flow rate of the overall return channel, thereby ensuring the structural strength of the charging and discharging tube 2, and is highly practical.

[0082] The second channel 22 consists of multiple groups, with each group of second channels 22 located at different positions at the end of the charging / discharging tube 2.

[0083] When the pressure is increased, the connecting pipe 20 fills the gas cylinder 1 with the experimental medium, the first one-way mechanism is in the open state, and the second one-way mechanism is in the closed state.

[0084] When the pressure is released, the experimental medium of gas cylinder 1 flows out through the connecting pipe 20, the second one-way mechanism is in the open state, and the first one-way mechanism is in the closed state.

[0085] In practice, depending on the actual situation, the second port can be used as the inlet and the first port as the outlet. In this embodiment, the first one-way mechanism is set to open when the connecting pipe 20 is filled into the gas cylinder 1 with experimental medium. That is, the first port is used as the outlet for the experimental medium to enter the gas cylinder 1 from the filling and discharging pipe 2, and the second port is used as the inlet for the experimental medium to flow back to the filling and discharging pipe 2. This can control the experimental medium to be delivered to the bottom of the gas cylinder 1 and then flow out from the bottle opening 10. The structure is simple, easy to install, and highly practical.

[0086] An annular groove is provided on the outer wall of the charging / discharging pipe 2 near the end of the connecting pipe 20, and the second pipe opening is located inside the annular groove;

[0087] The charging / discharging pipe 2 is fitted with an annular filter screen 25 inside the annular groove, and the second pipe opening is located inside the annular filter screen 25.

[0088] One end of the annular filter screen 25 rests against the end of the annular groove, and the other end rests against the end of the connecting pipe 20.

[0089] By creating an annular groove at the second inlet of the connecting pipe 20 and installing an annular filter 25 within the groove, the experimental medium entering the second channel 22 from the gas cylinder 1 can be filtered, thus preventing blockage of the second one-way mechanism and making it highly practical. At the same time, the cooperation between the annular groove, the annular filter 25, and the connecting pipe 20 allows the connecting pipe 20 to directly compress the annular filter 25, making installation more convenient.

[0090] The first one-way mechanism includes a first valve ball 211, a first compression spring 212, and a first retaining ring 213;

[0091] The end of the charging / discharging tube 2 away from the connecting tube 20 is provided with a first secondary channel 210. The first secondary channel 210 is coaxially arranged with the first channel 21, and the diameter of the first secondary channel 210 is larger than the diameter of the first channel 21.

[0092] A first conical wall is provided between the first auxiliary channel 210 and the first channel 21, and the first valve ball 211 abuts against the first conical wall;

[0093] The first fixing ring 213 is fixedly installed inside the first auxiliary channel 210, and the first compression spring 212 is located between the first fixing ring 213 and the first valve ball 211.

[0094] In practice, depending on the actual situation, a flap-type one-way valve can be selected as the first one-way mechanism, such as one directly installed in the first channel 21. In this embodiment, the first one-way mechanism is formed by the cooperation of the first valve ball 211, the first compression spring 212, the first fixing ring 213 and the first conical wall. The structure is simple, easy to install and has strong stability.

[0095] The second one-way mechanism includes a second valve ball 221, a second compression spring 222, and a second retaining ring 223;

[0096] A second auxiliary channel 220 is provided at one end of the charging / discharging pipe 2 near the connecting pipe 20. The second auxiliary channel 220 is coaxially arranged with the second channel 22, and the diameter of the second auxiliary channel 220 is larger than the diameter of the second channel 22.

[0097] A second conical wall is provided between the second auxiliary channel 220 and the second channel 22, and the second valve ball 221 abuts against the second conical wall;

[0098] The second fixing ring 223 is fixedly installed inside the second auxiliary channel 220, and the second compression spring 222 is located between the second fixing ring 223 and the second valve ball 221.

[0099] In practice, depending on the actual situation, a flap-type check valve can be selected as the second one-way mechanism, such as one installed directly in the second channel 22. In this embodiment, the second one-way mechanism is formed by the cooperation of the second valve ball 221, the second compression spring 222, the second fixing ring 223 and the second conical wall. The structure is simple, easy to install and has strong stability.

[0100] The charging / discharging tube 2 includes a main body 23 and an extension tube 24;

[0101] The main body 23 is connected to the connecting pipe 20;

[0102] The extension tube 24 is detachably connected to the main body 23, and the first tube opening is opened on the extension tube 24;

[0103] The second port is located on the main body 23.

[0104] In practice, depending on the actual situation, the main body 23 and the extension tube 24 can be integrally formed. In this embodiment, the extension tube 24 can be installed with different lengths for gas cylinders 1 of different lengths, thereby enhancing the applicability of the filling and discharging tube 2 and making it more adaptable.

[0105] A return mechanism 3 is installed at the end of the charging / discharging pipe 2 away from the connecting pipe 20;

[0106] The deflection mechanism 3 is used to deflect the experimental medium ejected from the first nozzle towards the nozzle 10 inside the gas cylinder 1.

[0107] The experimental medium ejected from the first nozzle is deflected at the bottom of the gas cylinder 1 towards the nozzle 10 by the deflection mechanism 3. This allows the experimental medium, which has heated up due to pressurization, to flow towards the nozzle of the gas cylinder 1 at a faster speed. During multiple filling and discharging cycles, the medium circulates between the gas cylinder 1 and the filling and discharging pipe 2, thereby making the temperature of the medium in the gas cylinder 1 more uniform and more practical.

[0108] The reversing mechanism 3 has a blind hole 320 at one end near the charging / discharging tube 2;

[0109] The reversing mechanism 3 includes an integrally formed reversing head 31 and a mounting post 32;

[0110] The turning head 31 has multiple turning holes 33 that communicate with the blind hole 320. The turning holes 33 are inclined from the inside to the outside towards the bottle mouth 10.

[0111] Mounting post 32 is screwed onto charging / discharging tube 2.

[0112] In practice, depending on the actual situation, a plate-shaped object in the shape of an arc can be selected as a deflection mechanism to deflect the experimental medium sprayed from the first nozzle towards the nozzle 10 inside the gas cylinder 1. In this embodiment, the deflection mechanism 3 is formed by setting the blind hole 320 and the deflection hole 33. The structure is simple, easy to install, and highly practical.

[0113] In this embodiment, during use, the charging and discharging tube 2 and the pressurizing device are connected by the connecting tube 20. The charging and discharging tube 2 is then placed into the gas cylinder 1 through the bottle opening 10, so that both the first and second tube openings are located inside the gas cylinder 1. The first tube opening is located at the end of the gas cylinder 1 away from the bottle opening 10, and the second tube opening is located at the end of the gas cylinder 1 close to the bottle opening 10. Then the bottle opening 10 of the gas cylinder 1 is sealed.

[0114] Afterwards, the pressurization equipment is started, and the experimental medium is introduced into the filling and discharging pipe 2 through the connecting pipe 20. The first one-way mechanism is opened, so that the experimental medium enters the bottom of the gas cylinder 1 from the first pipe opening, and after being deflected by the deflecting head 31, it is sprayed from the deflecting hole 33 towards the bottle opening 10. During this process, the experimental medium at the bottom of the bottle will heat up due to the pressurization.

[0115] After pressurization is completed, the pressurization device connected to the connecting pipe 20 depressurizes, and the experimental medium in the gas cylinder 1 leaves the gas cylinder 1 from the second port through the filling and discharging pipe 2. During this process, the experimental medium, which has been heated due to pressurization, flows in the gas cylinder 1, thereby making the temperature of the medium in the gas cylinder 1 relatively uniform, reducing the temperature difference in the body of the gas cylinder 1, and improving the accuracy of the experiment.

[0116] The foregoing has provided a detailed description of the medium flow control device for the extreme temperature and pressure cyclic fatigue test of a gas cylinder provided by the present invention. The specific embodiments described are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A medium flow control device for extreme temperature and pressure cyclic fatigue testing of gas cylinders, characterized in that: include: A filling / discharging tube (2) that can extend from the mouth (10) of the gas cylinder (1) to the bottom of the gas cylinder (1) and is connected to the connecting tube (20); The charging / discharging tube (2) has a first port at the end away from the connecting tube (20), and a first one-way mechanism is provided between the connecting tube (20) and the first port; The charging / discharging tube (2) has a second port at one end near the connecting tube (20), and a second one-way mechanism is provided between the connecting tube (20) and the second port; Both the first and second ports are connected to the connecting pipe (20), and the opening directions of the first and second one-way mechanisms are opposite. When in use, both the first and second ports are located inside the gas cylinder (1).

2. The gas cylinder extreme temperature and pressure cyclic fatigue test medium flow control device according to claim 1, characterized in that: The charging and discharging tube (2) is provided with a first channel (21), one end of the first channel (21) is connected to the connecting tube (20), and the other end forms a first tube opening; The end of the charging / discharging tube (2) near the connecting tube (20) is provided with a second channel (22), and the free end of the second channel (22) forms a second port that communicates with the outer wall of the charging / discharging tube (2).

3. The gas cylinder extreme temperature pressure cyclic fatigue test medium flow control device according to claim 2, characterized in that: There are multiple second channels (22), and the multiple second channels (22) are evenly distributed circumferentially along the central axis of the charging and discharging tube (2).

4. The gas cylinder extreme temperature and pressure cyclic fatigue test medium flow control device according to claim 2, characterized in that: When the pressure is increased, the connecting pipe (20) fills the gas cylinder (1) with the experimental medium, the first one-way mechanism is in the open state, and the second one-way mechanism is in the closed state; When the pressure is released, the experimental medium in the gas cylinder (1) flows out through the connecting pipe (20), the second one-way mechanism is in the open state, and the first one-way mechanism is in the closed state.

5. The gas cylinder extreme temperature and pressure cyclic fatigue test medium flow control device according to claim 4, characterized in that: The outer wall of the charging / discharging pipe (2) near the connecting pipe (20) has an annular groove, and the second pipe opening is located in the annular groove; The charging and discharging pipe (2) is fitted with an annular filter screen (25) inside the annular groove, and the second pipe opening is located inside the annular filter screen (25); One end of the annular filter screen (25) rests against the end of the annular groove, and the other end rests against the end of the connecting pipe (20).

6. The gas cylinder extreme temperature and pressure cyclic fatigue test medium flow control device according to claim 4, characterized in that: The first one-way mechanism includes a first valve ball (211), a first compression spring (212), and a first retaining ring (213). The charging and discharging tube (2) has a first secondary channel (210) at the end away from the connecting tube (20). The first secondary channel (210) is coaxially arranged with the first channel (21), and the diameter of the first secondary channel (21) is larger than the diameter of the first channel (21). A first conical wall is provided between the first auxiliary channel (210) and the first channel (21), and the first valve ball (211) abuts against the first conical wall; The first fixing ring (213) is fixedly installed inside the first auxiliary channel (210), and the first compression spring (212) is located between the first fixing ring (213) and the first valve ball (211).

7. The gas cylinder extreme temperature pressure cyclic fatigue test medium flow control device according to claim 4, characterized in that: The second one-way mechanism includes a second valve ball (221), a second compression spring (222), and a second retaining ring (223); The charging / discharging tube (2) has a second auxiliary channel (220) at one end near the connecting tube (20). The second auxiliary channel (220) is coaxially arranged with the second channel (22), and the diameter of the second auxiliary channel (22) is larger than the diameter of the second channel (22). A second conical wall is provided between the second auxiliary channel (220) and the second channel (22), and the second valve ball (221) abuts against the second conical wall; The second fixing ring (223) is fixedly installed inside the second auxiliary channel (220), and the second compression spring (222) is located between the second fixing ring (223) and the second valve ball (221).

8. The gas cylinder extreme temperature pressure cyclic fatigue test medium flow control device according to claim 1, characterized in that: The charging and discharging tube (2) includes a main body (23) and an extension tube (24); The main body (23) is connected to the connecting pipe (20); The extension tube (24) is detachably connected to the main body (23), and the first tube opening is opened on the extension tube (24); The second port is located on the main body (23).

9. The gas cylinder extreme temperature pressure cyclic fatigue test medium flow control device according to claim 4, characterized in that: A return mechanism (3) is installed at the end of the charging / discharging tube (2) away from the connecting tube (20); The deflection mechanism (3) is used to deflect the experimental medium ejected from the first nozzle into the gas cylinder (1) towards the nozzle (10).

10. The gas cylinder extreme temperature pressure cyclic fatigue test medium flow control device according to claim 9, characterized in that: The reversing mechanism (3) has a blind hole (320) at one end near the charging / discharging tube (2); The reversing mechanism (3) includes an integrally formed reversing head (31) and a mounting post (32). The folding head (31) is provided with a plurality of folding holes (33) communicating with the blind hole (320), and the folding holes (33) are inclined from the inside to the outside towards the bottle mouth (10); The mounting post (32) is screwed onto the charging / discharging tube (2).

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