Hydrogen detection device for double-wall hydrogen conveying pipe

Abstract

The utility model relates to the technical field of hydrogen detection, in particular to a hydrogen detection device for a double-wall hydrogen conveying pipe, which comprises a connecting pipe, a detection bin, a gas concentration leakage detector and an electromagnetic valve, the connecting pipe comprises an inner pipe and an outer pipe, and a gap between the inner pipe and the outer pipe is a first channel; the two ends of the first channel are each provided with a connecting piece used for being connected with a double-wall hydrogen conveying pipe, the connecting pieces block the first channel, the inner pipe and the outer pipe are both connected with the connecting pieces, the connecting pieces are provided with through holes communicated with the first channel, the detection bin is installed on the outer pipe, and an inner cavity of the detection bin is communicated with the first channel. And the electromagnetic valve and the gas concentration leakage detector are arranged on the detection bin. According to the hydrogen detection device disclosed by the utility model, when the double-wall hydrogen conveying pipe with hydrogen permeation or hydrogen leakage is replaced, the double-wall hydrogen conveying pipe with hydrogen permeation or hydrogen leakage cannot be replaced together with the hydrogen detection device, and only the double-wall hydrogen conveying pipe with hydrogen permeation or hydrogen leakage needs to be replaced, so that resource waste is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen detection, and more specifically, to a hydrogen detection device for a double-walled hydrogen transmission pipe. Background Art

[0002] Because hydrogen molecules are small, when hydrogen is transported through metal pipes, it is easy for hydrogen to penetrate into the metal pipes, causing hydrogen corrosion in the metal pipes. When hydrogen corrosion occurs in the hydrogen pipeline, it will cause permanent damage to the pipeline, greatly increasing the possibility of pipe failure. In order to solve the problem of hydrogen easily penetrating into the interior of the pipe and causing hydrogen corrosion in the pipe, the existing technology generally configures the hydrogen pipeline as a double-walled pipe, which has double side walls and an interlayer between the two side walls of the double-walled pipe. The double side walls of the double-walled hydrogen pipe can increase the difficulty of hydrogen penetrating to the outside of the double-walled hydrogen pipe, and when hydrogen penetrates into the double-walled hydrogen pipe, when hydrogen penetrates into the interlayer between the double side walls, the difficulty of hydrogen moving in the interlayer is less than the difficulty of hydrogen continuing to permeate outward, and the hydrogen will be stored in the interlayer.

[0003] Hydrogen permeation into the interlayer of a double-walled hydrogen transmission pipe indicates that hydrogen permeation has occurred in the inner layer of the double-walled hydrogen transmission pipe. In order to safely transport hydrogen, the pipe needs to be promptly repaired and replaced after hydrogen permeation occurs. The existing technology is to set a hydrogen leak detection device on the outer wall of the outer layer of the double-walled hydrogen transmission pipe to detect whether hydrogen leakage has occurred in the pipe. However, when hydrogen leakage occurs in a double-walled hydrogen transmission pipe, when replacing the double-walled hydrogen transmission pipe, the hydrogen leak detection device set on the outer pipe of the double-walled hydrogen transmission pipe needs to be replaced together. The replaced hydrogen leak detection device cannot be put into use again and needs to be discarded together, which will cause a waste of resources. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiency in the prior art that after a hydrogen leak occurs in a double-walled hydrogen transmission pipe, the hydrogen leakage detection device arranged on the outer tube of the double-walled hydrogen transmission pipe needs to be discarded when the double-walled hydrogen transmission pipe is replaced. A hydrogen detection device for a double-walled hydrogen transmission pipe is provided. The hydrogen detection device in the utility model does not need to be arranged on the outer side wall of the outer tube of the double-walled hydrogen transmission pipe. When the old double-walled hydrogen transmission pipe is replaced, it does not need to be discarded together with the hydrogen detection device and can continue to be used, thereby avoiding waste of resources.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A hydrogen detection device for a double-walled hydrogen transmission pipe is provided, comprising a connecting pipe, a detection chamber, a gas concentration leak detector and a solenoid valve, wherein the connecting pipe comprises an inner pipe and an outer pipe, the gap between the inner pipe and the outer pipe being a first channel, both ends of the first channel being provided with connectors for connecting to the double-walled hydrogen transmission pipe, the connectors blocking the first channel, the inner pipe and the outer pipe being connected to the connectors, the connectors being provided with a through hole communicating with the first channel, the detection chamber being mounted on the outer pipe, the inner cavity of the detection chamber being communicated with the first channel, the solenoid valve being mounted at the air outlet of the detection chamber, and the gas concentration leak detector being mounted on the detection chamber.

[0007] The utility model relates to a hydrogen detection device for a double-walled hydrogen transmission pipe. During installation, the device is connected to the double-walled hydrogen transmission pipe through connectors at both ends of the connecting pipe. After the connecting pipe is connected to the double-walled hydrogen transmission pipe, the first channel in the connecting pipe is connected to the interlayer between the double-walled hydrogen transmission pipe through the through-hole on the connecting member, and the inner pipe in the connecting pipe is connected to the inner pipe of the double-walled hydrogen transmission pipe. After the connecting pipe is connected to the double-walled hydrogen transmission pipe, when hydrogen permeation or hydrogen leakage occurs in the inner pipe of the double-walled hydrogen transmission pipe, the hydrogen will enter the interlayer of the double-walled hydrogen transmission pipe and move within the interlayer of the double-walled hydrogen transmission pipe. When the hydrogen in the interlayer of the double-walled hydrogen transmission pipe enters the first channel along the through-hole, the hydrogen in the first channel continues to move into the detection chamber. When the hydrogen enters the detection chamber, the gas concentration in the detection chamber changes. The gas concentration leak detector on the detection chamber will detect the change in gas concentration in the detection chamber and can transmit the change result to the central console through an electrical signal. When the gas concentration leak detector detects that the concentration of hydrogen in the detection chamber is too high, it means that the hydrogen concentration in the interlayer of the double-walled hydrogen transmission pipe is too high and the hydrogen leakage of the double-walled hydrogen transmission pipe is serious. At this time, the solenoid valve on the detection chamber is opened, and the hydrogen is slowly discharged to the external environment through the solenoid valve to avoid sudden large-scale hydrogen discharge and explosion. The hydrogen detection device in this solution is installed in the hydrogen transmission pipeline system through a connecting pipe. It can detect whether hydrogen permeation or even hydrogen leakage occurs in the double-walled hydrogen transmission pipe in the hydrogen transmission pipeline system. When the double-walled hydrogen transmission pipe with hydrogen permeation or hydrogen leakage is replaced, the hydrogen detection device will not be replaced together. Only the double-walled hydrogen transmission pipe with hydrogen permeation or hydrogen leakage needs to be replaced. The hydrogen detection device can continue to be used to avoid waste of resources.

[0008] Furthermore, in the vertical direction, the detection chamber is located above the connecting tube. A connecting tube is provided at the bottom of the detection chamber. One end of the connecting tube is connected to the inner cavity of the detection chamber, and the other end is connected to the top of the first channel. The inner cavity of the detection chamber is connected to the first channel via the connecting tube. The detection chamber is connected to the first channel via the connecting tube, and hydrogen enters the detection chamber from the first channel through the connecting tube. Since the density of hydrogen is less than that of air, after entering the first channel, the hydrogen is located at the top of the first channel. At this time, the hydrogen can smoothly enter the detection chamber along the connecting tube. Therefore, the detection chamber is located above the connecting tube, which makes it easier for hydrogen to enter the inner cavity of the detection chamber.

[0009] Furthermore, the connecting pipe is equidistant from both ends of the connecting pipe. This means the connecting pipe is located in the middle of the connecting pipe. When the double-walled hydrogen pipes at either end of the connecting pipe leak, the hydrogen in both double-walled hydrogen pipes travels the same distance from the connecting pipe to the connecting pipe. This allows the gas concentration leak detector in the detection chamber to accurately and quickly detect changes in hydrogen concentration within the interlayer of the two double-walled hydrogen pipes.

[0010] Furthermore, the detection chamber is also equipped with a temperature probe and a digital pressure switch, the detection portions of which extend into the inner cavity of the detection chamber. The temperature probe can detect the gas temperature within the detection chamber, and the digital pressure switch can display the gas pressure within the detection chamber in digital form on the detection chamber's outer surface. By using the temperature probe and digital pressure switch to check the temperature and pressure within the detection chamber, the purpose of multi-dimensional detection of the gas environment within the detection chamber is achieved, further preventing the explosion of hydrogen gas within the detection chamber.

[0011] Furthermore, the solenoid valve opens when the gas concentration leak detector detects a hydrogen concentration greater than 4.0% Vol, or the digital pressure switch detects a pressure within the detection chamber greater than 2.5 MPa, or the temperature probe detects a temperature within the detection chamber greater than 500°C. When the hydrogen volume concentration within the detection chamber exceeds 4.0% Vol, the pressure exceeds 2.5 MPa, and the temperature exceeds 500°C, the upper limit of the dangerous value for high-pressure hydrogen explosion has been reached. Further increases in these values could lead to a hydrogen explosion. Therefore, the solenoid valve needs to be opened to discharge the hydrogen to the external environment to prevent a hydrogen explosion.

[0012] Furthermore, the detection chamber is a rectangular parallelepiped, the gas concentration leak detector is located at the top of the detection chamber, the connecting pipe is located at the bottom of the detection chamber, the temperature probe, the digital pressure switch, and the gas outlet of the detection chamber are respectively located on different sides of the detection chamber, and the solenoid valve is located on the side of the detection chamber where the gas outlet is located. The digital pressure switch, temperature probe, solenoid valve, and gas concentration leak detector are respectively installed on different sides of the detection chamber, so that each component has sufficient installation space and avoids interference with each other.

[0013] Furthermore, the connecting piece is integrally formed with the inner tube and the outer tube, which can further ensure the sealing performance of the connecting tube.

[0014] Furthermore, the outer ring of the connector protrudes from the outer tube in a direction perpendicular to the axis of the connecting tube. Several bolt holes are arranged in a circumferential array on the outer ring of the connector. The end surface of the double-walled hydrogen transmission tube is provided with mounting holes for connecting bolts. The connecting bolts pass through the mounting holes and bolt holes and are tightened to complete the connection between the connecting tube and the double-walled hydrogen transmission tube. This bolted connection is convenient for assembly and disassembly and provides high connection strength.

[0015] Furthermore, there are a plurality of through holes, which are equidistantly arranged on the circumference of the connector with the axis of the connecting pipe as the center. There are a plurality of through holes, each of which is connected to the interlayer of the double-walled hydrogen transmission pipe, so that hydrogen in the interlayer of the double-walled hydrogen transmission pipe can quickly pass through the through holes into the interior of the first channel, and then enter the detection chamber along the interior of the first channel.

[0016] Furthermore, both the inner tube and the outer tube are composite co-extruded tubes made of high-density polyethylene (HDPE) and ethylene-vinyl alcohol copolymer (EVOH). The co-extruded tubes made of HDPE and EVOH have uniform texture and stable properties, making them difficult for hydrogen to penetrate.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The utility model discloses a hydrogen detection device for a double-walled hydrogen transmission pipe, which is installed in a hydrogen transmission pipe system through a connecting pipe. The device can detect whether hydrogen permeation or even hydrogen leakage occurs in the double-walled hydrogen transmission pipe in the hydrogen transmission pipe system. When the double-walled hydrogen transmission pipe with hydrogen permeation or hydrogen leakage is replaced, the hydrogen detection device does not need to be replaced together. Only the double-walled hydrogen transmission pipe with hydrogen permeation or hydrogen leakage needs to be replaced, and the hydrogen detection device can continue to be used, thereby avoiding waste of resources.

[0019] The utility model provides a hydrogen detection device for a double-walled hydrogen transmission pipe, and a temperature measuring probe and a digital pressure switch are also installed on the detection chamber. The temperature and pressure in the detection chamber can be checked by the temperature measuring probe and the digital pressure switch, thereby achieving the purpose of multi-dimensional detection of the gas environment in the detection chamber, and further avoiding the explosion of hydrogen in the detection chamber.

[0020] The utility model discloses a hydrogen detection device for a double-walled hydrogen transmission pipe, wherein the connecting piece is integrally formed with the inner pipe and the outer pipe, and then connected to the double-walled hydrogen transmission pipe by bolts. This not only further improves the sealing performance of the connecting pipe, but also adopts a bolt connection method that is convenient for assembly and disassembly and has high connection strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a hydrogen detection device for a double-walled hydrogen transmission pipe;

[0022] Figure 2 This is a schematic diagram of the internal structure of a hydrogen detection device for a double-walled hydrogen transmission pipe;

[0023] Figure 3 A side view of a hydrogen detection device for a double-walled hydrogen transmission pipe.

[0024] In the accompanying drawings: 1. Connecting pipe; 2. Detection chamber; 3. Gas concentration leak detector; 4. Solenoid valve; 101. Inner pipe; 102. Outer pipe; 5. First channel; 103. Connecting piece; 131. Through hole; 6. Connecting pipe; 7. Temperature probe; 8. Digital pressure switch; 132. Bolt hole. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.

[0026] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and so on indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] Example 1

[0028] This embodiment is the first embodiment of a hydrogen detection device for a double-walled hydrogen transmission pipe. Figure 1-Figure 3 As shown, it includes a connecting pipe 1, a detection chamber 2, a gas concentration leak detector 3 and a solenoid valve 4. The connecting pipe 1 includes an inner tube 101 and an outer tube 102. The gap between the inner tube 101 and the outer tube 102 is a first channel 5. Both ends of the first channel 5 are provided with connectors 103 for connecting to the double-walled hydrogen transmission pipe. The connector 103 blocks the first channel 5. The inner tube 101 and the outer tube 102 are both connected to the connector 103. The connector 103 is provided with a through hole 131 connected to the first channel 5. The detection chamber 2 is installed on the outer tube 102. The inner cavity of the detection chamber 2 is connected to the first channel 5. The solenoid valve 4 is installed at the air outlet of the detection chamber 2, and the gas concentration leak detector 3 is installed on the detection chamber 2.

[0029] The working principle and working process of this embodiment are as follows:

[0030] The utility model relates to a hydrogen detection device for a double-walled hydrogen transmission pipe. During installation, the device is connected to the double-walled hydrogen transmission pipe through the connectors 103 at both ends of the connecting pipe 1. After the connecting pipe 1 is connected to the double-walled hydrogen transmission pipe, the first channel 5 in the connecting pipe 1 is connected to the interlayer between the double-walled hydrogen transmission pipe through the through hole 131 on the connector 103, and the inner pipe 101 in the connecting pipe 1 is connected to the inner pipe of the double-walled hydrogen transmission pipe. After the connecting pipe 1 is connected to the double-walled hydrogen transmission pipe, when hydrogen permeation or hydrogen leakage occurs in the inner pipe of the double-walled hydrogen transmission pipe, the hydrogen will enter the interlayer of the double-walled hydrogen transmission pipe and move within the interlayer of the double-walled hydrogen transmission pipe. After the hydrogen in the interlayer of the double-walled hydrogen transmission pipe enters the first channel 5 along the through hole 131, the hydrogen in the first channel 5 continues to move into the detection chamber 2. When hydrogen enters the detection chamber 2, the gas concentration in the detection chamber 2 changes. The gas concentration leak detector 3 on the detection chamber 2 will detect the change in gas concentration in the detection chamber 2 and transmit the change result to the central control console via an electrical signal. When the gas concentration leak detector 3 detects that the hydrogen concentration in the detection chamber 2 is too high, it means that the hydrogen concentration in the interlayer of the double-walled hydrogen transmission pipe is too high and the hydrogen leakage in the double-walled hydrogen transmission pipe is serious. At this time, the solenoid valve 4 on the detection chamber 2 is opened, and the hydrogen is slowly discharged to the external environment through the solenoid valve 4 to avoid sudden large-scale hydrogen discharge and explosion.

[0031] The beneficial effects of this embodiment are as follows: the hydrogen detection device in this embodiment is installed in the hydrogen pipeline system through the connecting pipe 1, and can detect whether hydrogen permeation or even hydrogen leakage occurs in the double-walled hydrogen pipeline in the hydrogen pipeline system. When the double-walled hydrogen pipeline that has hydrogen permeation or hydrogen leakage is replaced, the hydrogen detection device will not be replaced together. Only the double-walled hydrogen pipeline that has hydrogen permeation or hydrogen leakage needs to be replaced, and the hydrogen detection device can continue to be used, avoiding waste of resources.

[0032] Example 2

[0033] This embodiment is a second embodiment of a hydrogen detection device for a double-walled hydrogen transmission pipe. This embodiment is based on the first embodiment. Figure 2-Figure 3 As shown, the structure of the detection chamber 2 is further limited.

[0034] Specifically, in the vertical direction, the detection chamber 2 is located above the connecting tube 1. A connecting tube 6 is provided at the bottom of the detection chamber 2. One end of the connecting tube 6 is connected to the inner cavity of the detection chamber 2, and the other end is connected to the top of the first channel 5. The inner cavity of the detection chamber 2 is connected to the first channel 5 through the connecting tube 6. The distance between the connecting tube 6 and the two ends of the connecting tube 1 is equal.

[0035] Specifically, the detection chamber 2 is also equipped with a temperature probe 7 and a digital pressure switch 8. The detection portions of the temperature probe 7 and the digital pressure switch 8 extend into the inner cavity of the detection chamber 2. The temperature probe 7 can detect the gas temperature in the detection chamber 2, and the digital pressure switch 8 can display the gas pressure in the detection chamber 2 in digital form on the outer surface of the detection chamber 2.

[0036] Specifically, when the gas concentration leak detector 3 detects that the hydrogen concentration is greater than 4.0% VOL, or the digital pressure switch 8 detects that the pressure in the detection chamber 2 is greater than 2.5 MPa, or the temperature probe 7 detects that the temperature in the detection chamber 2 is greater than 500°C, the solenoid valve 4 opens.

[0037] Specifically, the detection chamber 2 is a rectangular parallelepiped, the gas concentration leak detector 3 is located at the top of the detection chamber 2, the connecting pipe 6 is located at the bottom of the detection chamber 2, the temperature probe 7, the digital pressure switch 8 and the air outlet of the detection chamber 2 are respectively located on different sides of the detection chamber 2, and the solenoid valve 4 is installed on the side of the detection chamber 2 where the air outlet of the detection chamber 2 is located.

[0038] The beneficial effects of this embodiment are as follows:

[0039] Detection chamber 2 is connected to first channel 5 via connecting pipe 6, through which hydrogen enters detection chamber 2 from first channel 5. Because hydrogen has a lower density than air, positioning detection chamber 2 above connecting pipe 1 facilitates hydrogen's entry into the inner cavity of detection chamber 2. Connecting pipe 6 is equidistant from both ends of connecting pipe 1, enabling gas leak detector 3 in detection chamber 2 to accurately and quickly detect changes in hydrogen concentration within the interlayer between the two double-walled hydrogen transmission pipes.

[0040] The temperature probe 7 can detect the gas temperature in the detection chamber 2, and the digital pressure switch 8 can display the gas pressure in the detection chamber 2 in digital form on the outer surface of the detection chamber 2. The temperature and pressure in the detection chamber 2 are checked by the temperature probe 7 and the digital pressure switch 8, so as to achieve the purpose of multi-dimensional detection of the gas environment in the detection chamber 2, and further avoid the explosion of hydrogen in the detection chamber 2. When the volume concentration of hydrogen in the detection chamber 2 is greater than 4.0% VOL, the pressure is greater than 2.5 MPa, and the temperature is greater than 500°C, the upper limit of the dangerous value for high-pressure hydrogen explosion has been reached. Therefore, it is necessary to open the solenoid valve 4 to discharge hydrogen to the external environment to avoid hydrogen explosion.

[0041] The digital pressure switch 8, temperature probe 7, solenoid valve 4 and gas concentration leakage detector 3 are respectively installed on different surfaces of the detection chamber 2 so that each component has sufficient installation space to avoid interference with each other.

[0042] Example 3

[0043] This embodiment is a third embodiment of a hydrogen detection device for a double-walled hydrogen transmission pipe. This embodiment is based on the first embodiment. Figure 3 As shown, the structures of the connecting pipe 1 and the connecting piece 103 are further defined.

[0044] Specifically, the connecting piece 103 is integrally formed with the inner tube 101 and the outer tube 102 .

[0045] Specifically, the outer ring of connector 103 protrudes from the outer side of outer tube 102 in a direction perpendicular to the axis of connecting tube 1. A plurality of bolt holes 132 are arranged in a circumferential array on the outer ring of connector 103, each of which houses a connecting bolt. Mounting holes for connecting bolts are provided on the end face of the double-walled hydrogen transmission pipe. The connecting bolts pass through the mounting holes and bolt holes 132 and are tightened, completing the connection between connecting tube 1 and the double-walled hydrogen transmission pipe.

[0046] Specifically, there are a plurality of through holes 131 , and the through holes 131 are equidistantly arranged on the circumference of the connecting member 103 with the axis of the connecting pipe 1 as the center.

[0047] Specifically, the inner tube 101 and the outer tube 102 are both composite co-extruded tubes of high-density polyethylene and ethylene-vinyl alcohol copolymer.

[0048] The beneficial effects of this embodiment are as follows:

[0049] The connector 103 and the inner tube 101 and outer tube 102 are integrally formed, which can further ensure the sealing of the connecting tube 1. The connecting tube 1 and the double-walled hydrogen transmission pipe are connected by bolts, which is convenient for assembly and disassembly and has high connection strength.

[0050] There are several through holes 131, and each through hole 131 is connected to the interlayer on the double-walled hydrogen transmission pipe, so that the hydrogen in the interlayer of the double-walled hydrogen transmission pipe can quickly pass through the through hole 131 into the first channel 5, and enter the detection chamber 2 along the first channel 5.

[0051] The pipe formed by the co-extrusion of high-density polyethylene and ethylene-vinyl alcohol copolymer has uniform texture, stable properties, and is difficult for hydrogen to penetrate.

[0052] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A hydrogen detection device for a double-walled hydrogen transmission pipe, characterized in that: The invention comprises a connecting pipe (1), a detection chamber (2), a gas concentration leakage detector (3) and a solenoid valve (4); the connecting pipe (1) comprises an inner pipe (101) and an outer pipe (102); the gap between the inner pipe (101) and the outer pipe (102) is a first channel (5); both ends of the first channel (5) are provided with connectors (103) for connecting to a double-walled hydrogen transmission pipe; the connectors (103) block the first channel (5); the inner pipe (101) and the outer pipe (102) are both connected to the connectors (103); the connectors (103) are provided with a through hole (131) communicating with the first channel (5); the detection chamber (2) is mounted on the outer pipe (102); the inner cavity of the detection chamber (2) is communicated with the first channel (5); the solenoid valve (4) is mounted at the gas outlet of the detection chamber (2); and the gas concentration leakage detector (3) is mounted on the detection chamber (2).

2. A hydrogen detection device for a double-walled hydrogen transmission pipe according to claim 1, characterized in that: In the vertical direction, the detection chamber (2) is located above the connecting pipe (1), and a connecting pipe (6) is provided at the bottom of the detection chamber (2). One end of the connecting pipe (6) is connected to the inner cavity of the detection chamber (2), and the other end is connected to the top of the first channel (5). The inner cavity of the detection chamber (2) is connected to the first channel (5) through the connecting pipe (6).

3. A hydrogen detection device for a double-walled hydrogen transmission pipe according to claim 2, characterized in that: The distances between the communicating pipe (6) and both ends of the connecting pipe (1) are equal.

4. A hydrogen detection device for a double-walled hydrogen transmission pipe according to claim 2, characterized in that: A temperature measuring probe (7) and a digital pressure switch (8) are also installed on the detection chamber (2), and the detection parts of the temperature measuring probe (7) and the digital pressure switch (8) both extend into the inner cavity of the detection chamber (2).

5. A hydrogen detection device for a double-walled hydrogen transmission pipe according to claim 4, characterized in that: When the gas concentration leakage detector (3) detects that the concentration of hydrogen is greater than 4.0% VOL, or the digital pressure switch (8) detects that the pressure in the detection chamber (2) is greater than 2.5 MPa, or the temperature probe (7) detects that the temperature in the detection chamber (2) is greater than 500° C., the solenoid valve (4) opens.

6. A hydrogen detection device for a double-walled hydrogen transmission pipe according to claim 4, characterized in that: The detection chamber (2) is a rectangular parallelepiped, the gas concentration leakage detector (3) is located at the top of the detection chamber (2), the connecting pipe (6) is located at the bottom of the detection chamber (2), the temperature measuring probe (7), the digital pressure switch (8) and the air outlet of the detection chamber (2) are respectively located on different sides of the detection chamber (2), and the solenoid valve (4) is located on the side of the detection chamber (2) where the air outlet is located.

7. A hydrogen detection device for a double-walled hydrogen transmission pipe according to claim 1, characterized in that: The connecting piece (103) is integrally formed with the inner tube (101) and the outer tube (102).

8. A hydrogen detection device for a double-walled hydrogen transmission pipe according to claim 7, characterized in that: In a direction perpendicular to the axis of the connecting pipe (1), the outer ring of the connecting piece (103) protrudes from the outside of the outer pipe (102), and a plurality of bolt holes (132) are arranged in a circumferential array on the outer ring of the connecting piece (103).

9. A hydrogen detection device for a double-walled hydrogen transmission pipe according to claim 1, characterized in that: There are a plurality of through holes (131), and the plurality of through holes (131) are equidistantly arranged on the circumference of the connecting piece (103) with the axis of the connecting pipe (1) as the center.

10. A hydrogen detection device for a double-walled hydrogen transmission pipe according to claim 1, characterized in that: The inner tube (101) and the outer tube (102) are both composite co-extruded tubes of high-density polyethylene and ethylene-vinyl alcohol copolymer.

Images