A hydrogen permeability testing device and a testing method

Abstract

The present invention provides a hydrogen permeability test device and a test method, the hydrogen permeability test device comprises a hydrogen pressure module, a negative pressure module, a temperature adjustment module, and a test fixture module, the test fixture module comprises a vacuum chamber located in the middle, a test piece to be tested is installed in the vacuum chamber of the test fixture module, one end of the test piece to be tested is connected to the hydrogen pressure module, and the other end is closed; both ends of the vacuum chamber are sealed and coated on the test piece and connected to the negative pressure module; the cold and hot fluid chamber is sealed and coated on the outside of the vacuum chamber, a cold and hot fluid medium is arranged in the cold and hot fluid chamber, and the cold and hot fluid chamber is connected to the temperature adjustment module for adjusting the temperature of the cold and hot fluid medium through a pipeline. By adopting the technical solution of the present invention, the hydrogen permeability can be calculated by monitoring the numerical change of the negative pressure, and the device has a simple structure, low cost, and convenient operation.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrogen testing instruments, and in particular relates to a hydrogen permeability testing device and a testing method. Background Art

[0002] With the expansion of automobile market demand and people's growing awareness of environmental protection, the market position of traditional fuel vehicles will be gradually compressed. As electric vehicles are currently popular in the market, there has always been controversy over battery life and safety. In recent years, hydrogen energy has slowly developed as a clean and efficient energy source, but hydrogen energy has a high risk factor due to its physical properties, so the safety of the transmission pipeline is of vital importance. At present, the performance test equipment for the permeability of the transmission pipeline is relatively scarce and complex, and inconvenient to operate. Summary of the invention

[0003] In view of the above technical problems, the present invention discloses a hydrogen permeability testing device and a testing method, which have a simple structure and are easy to operate.

[0004] To this end, the technical solution adopted by the present invention is:

[0005] A hydrogen permeability testing device, comprising a hydrogen pressure module, a negative pressure module, a temperature adjustment module, and a test tooling module;

[0006] The test fixture module includes a vacuum chamber located in the middle, and the test piece to be tested is installed in the vacuum chamber of the test fixture module. One end of the test piece to be tested is connected to the hydrogen pressure module, and the other end is closed; the two ends of the vacuum chamber are sealed and covered on the test piece and connected to the negative pressure module; the cold and hot fluid chamber is sealed and covered on the outside of the vacuum chamber, and the cold and hot fluid medium is arranged in the cold and hot fluid chamber, and the cold and hot fluid chamber is connected to the temperature regulating module for regulating the temperature of the cold and hot fluid medium through a pipeline;

[0007] The negative pressure module includes a vacuum gauge, and the vacuum gauge is connected to the vacuum chamber;

[0008] The hydrogen pressure module includes a pressure sensor, and the pressure sensor is connected to one end of the test piece to be tested.

[0009] The test piece to be tested is a vehicle hydrogen transmission pipeline. By adopting the technical solution of the present invention, the hydrogen permeability can be calculated by monitoring the change of the negative pressure value of the negative pressure module, which is simple, convenient and reliable to use.

[0010] As a further improvement of the present invention, the negative pressure module includes a vacuum pump and a negative pressure regulating valve, and the vacuum pump is connected to the vacuum chamber through the negative pressure regulating valve.

[0011] As a further improvement of the present invention, the negative pressure regulating valve is connected to the vacuum chamber through a vacuum cut-off valve.

[0012] As a further improvement of the present invention, the temperature regulation module includes a hot and cold all-in-one machine, a circulation pump and a temperature sensor. One end of the hot and cold all-in-one machine is connected to the outlet of the hot and cold fluid cavity, and the other end of the hot and cold all-in-one machine is connected to the inlet of the hot and cold fluid cavity through the circulation pump. A temperature sensor is provided on the pipeline from the inlet of the hot and cold fluid cavity to the circulation pump.

[0013] As a further improvement of the present invention, the temperature regulating module includes a return stop valve and an outlet stop valve, the return stop valve is located between one end of the hot and cold integrated machine and the outlet of the hot and cold fluid chamber, and the outlet stop valve is located between the circulation pump and the inlet of the hot and cold fluid chamber.

[0014] As a further improvement of the present invention, the hydrogen pressure module includes a hydrogen storage device and a regulating valve, the hydrogen storage device is connected to one end of the test piece to be tested through the regulating valve, and the pressure sensor is arranged on a pipeline connected to one end of the test piece to be tested.

[0015] As a further improvement of the present invention, the hydrogen pressure module includes an electromagnetic shut-off valve and a hydrogen stop valve, the regulating valve includes a primary pressure regulating valve and a secondary pressure regulating valve, the hydrogen storage device is connected to the electromagnetic shut-off valve through the primary pressure regulating valve, the electromagnetic shut-off valve is connected to the hydrogen stop valve through the secondary pressure regulating valve, and the pressure sensor is located on the connecting pipeline between the hydrogen stop valve and one end of the test piece to be tested.

[0016] As a further improvement of the present invention, a heat preservation cavity is provided outside the cold and hot fluid cavity.

[0017] The present invention discloses a hydrogen permeability testing method, which uses any of the above hydrogen permeability testing devices to perform testing according to the following steps:

[0018] Install the test piece to be tested in the vacuum chamber of the test fixture module so that both ends of the vacuum chamber are sealed and covered on the test piece;

[0019] Turn on the negative pressure module, adjust the negative pressure in the vacuum chamber to the set value and maintain it;

[0020] Turn on the hydrogen pressure module, deliver hydrogen into the test piece to be tested and maintain it;

[0021] Turn on the temperature regulating module to make the temperature in the vacuum chamber meet the experimental requirements and maintain it;

[0022] Close the vacuum stop valve and the hydrogen stop valve;

[0023] The pressure change in the vacuum chamber is monitored in real time by the vacuum gauge of the negative pressure module, and the difference between the initial vacuum pressure and the final vacuum pressure is finally compared;

[0024] The permeability of the test piece at the specified pressure and temperature is finally obtained by calculating the hydrogen pressure of the pressure sensor, the difference between the initial vacuum pressure and the final vacuum pressure of the vacuum gauge, and the temperature data of the temperature control module.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] By adopting the technical solution of the present invention, hydrogen of a specified pressure is introduced into the hydrogen transmission pipeline under simulated actual working conditions. By monitoring the numerical change of the negative pressure, the permeation amount of hydrogen through the transmission pipe wall can be calculated, thereby ensuring that the hydrogen transmission pipeline produced and used is safe. The device has a simple structure, low cost and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a hydrogen permeability testing device according to an embodiment of the present invention.

[0028] Reference numerals include:

[0029] 1-Hydrogen pressure module, 2-Negative pressure module, 3-Temperature adjustment module, 4-Test tooling module, 5-Test piece;

[0030] 11-hydrogen storage bottle, 12-first-stage pressure regulating valve, 13-electromagnetic shut-off valve, 14-second-stage pressure regulating valve, 15-hydrogen stop valve, 16-pressure sensor;

[0031] 21-vacuum pump, 22-negative pressure regulating valve, 23-vacuum gauge, 24-vacuum stop valve;

[0032] 31-return stop valve, 32-cold and hot integrated machine, 33-circulation pump, 34-outlet stop valve, 35-temperature sensor;

[0033] 41 - vacuum chamber, 42 - hot and cold fluid chamber, 43 - insulation chamber. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention are described in further detail below.

[0035] like Figure 1 As shown, a hydrogen permeability testing device includes a hydrogen pressure module 1, a negative pressure module 2, a temperature adjustment module 3, a test tooling module 4 and a controller.

[0036] The hydrogen pressure module 1 provides a stable hydrogen gas source output with the required pressure for the test; it mainly includes a hydrogen storage bottle 11, a primary pressure regulating valve 12, an electromagnetic shut-off valve 13, a secondary pressure regulating valve 14, a hydrogen stop valve 15, a pressure sensor 16 and a joint pipeline.

[0037] The negative pressure module 2 provides a stable vacuum carrier gas output with the required pressure for the test; it mainly includes a vacuum pump 21, a negative pressure regulating valve 22, a vacuum gauge 23, a vacuum stop valve 24 and a joint pipeline.

[0038] The temperature regulating module 3 provides a stable vacuum carrier gas temperature output that meets the temperature requirements for the test through indirect heat transfer, and mainly includes a return stop valve 31, a hot and cold integrated machine 32, a circulation pump 33, an outlet stop valve 34, a temperature sensor 35 and a joint pipeline.

[0039] The test fixture module 4 serves as a test piece installation site and mainly comprises a vacuum chamber 41 , a cold and hot fluid chamber 42 , and a heat preservation chamber 43 .

[0040] The hydrogen pressure module 1, the negative pressure module 2, and the temperature adjustment module 3 finally achieve the experimental purpose in the test tooling module 4 project in turn.

[0041] The test piece 5 is installed on the test tooling module 4 and connected to the hydrogen pressure module 1; the two ends of the vacuum chamber 41 are sealed and covered on the test piece and connected to the negative pressure module 2; the cold and hot fluid chamber 42 is sealed and covered on the vacuum chamber 41 and connected to the return stop valve 31 and the temperature sensor 35 of the temperature adjustment module 3 to form a circulation loop.

[0042] The high-pressure gas in the hydrogen storage bottle 11 is first decompressed by the primary pressure regulating valve 12 to reduce the output pressure, and then connected in sequence to the electromagnetic shut-off valve 13, the secondary pressure regulating valve 14, the hydrogen shut-off valve 15, the pressure sensor 16, and finally connected to the test piece 5. The electromagnetic shut-off valve 13 plays an on-off role, and can automatically switch to replenish pressure or cut off pressure supply to the test piece 5 during the test; the secondary pressure regulating valve 14 adjusts the hydrogen pressure to the target test pressure value; the hydrogen shut-off valve 15, as an on-off valve, can be manually opened or closed during the test to replenish pressure or cut off pressure supply to the test piece 5; the pressure sensor 16, as a hydrogen pressure measuring element, provides a guide for the pressure regulation of the secondary pressure regulating valve 14, and uploads the collected pressure data to the controller in real time.

[0043] The outlet of the vacuum pump 21 is connected to the negative pressure regulating valve 22, the vacuum stop valve 24, the vacuum gauge 23 in sequence, and then connected to the vacuum chamber 41. The pressure output by the vacuum pump 21 is regulated by the negative pressure regulating valve 22, the vacuum stop valve 24 is opened, and the pressure enters the vacuum chamber 41 through the vacuum gauge 23. After the pressure is stabilized, the vacuum stop valve 24 is closed, and the pressure change in the vacuum chamber 41 is monitored in real time by the vacuum gauge 23 and uploaded to the controller, and finally the difference between the initial pressure and the final pressure is compared.

[0044] The outlet of the hot and cold integrated machine 32 is connected to the circulation pump 33, the return stop valve 31, the temperature sensor 35, the hot and cold fluid chamber 42, and the return stop valve 31 in sequence. After the medium in the hot and cold integrated machine 32 is heated / cooled, it flows through the outlet stop valve 34, the temperature sensor 35, the hot and cold fluid chamber 42, and the return stop valve 31 under the action of the circulation pump 33, and finally flows back to the hot and cold integrated machine 32. The return stop valve 31 and the return stop valve 31 are usually in an open state, and are closed only when the hot and cold fluid chamber 42 needs to be replaced. The temperature sensor 35 monitors the temperature of the circulating liquid in the pipeline in real time and uploads it to the controller. The controller also controls the hot and cold integrated machine 32 to output the medium temperature that meets the requirements, and finally transmits the temperature to the vacuum chamber 41 through the circulation action, so that the temperature of the vacuum chamber 41 meets the experimental requirements.

[0045] The controller is respectively connected to the electromagnetic shut-off valve 13 and the pressure sensor 16 of the hydrogen pressure module 1 , the vacuum pump 21 and the vacuum gauge 23 of the negative pressure module 2 , the cold and hot integrated machine 32 , the circulation pump 33 and the temperature sensor 35 of the temperature adjustment module 3 .

[0046] The test method of the above hydrogen permeability test device includes:

[0047] Install the test piece to be tested in the vacuum chamber of the test fixture module so that both ends of the vacuum chamber are sealed and covered on the test piece;

[0048] Turn on the negative pressure module, adjust the negative pressure in the vacuum chamber to the set value and maintain it;

[0049] Turn on the hydrogen pressure module, deliver hydrogen into the test piece to be tested and maintain it;

[0050] Turn on the temperature regulating module to make the temperature in the vacuum chamber meet the experimental requirements and maintain it;

[0051] Close the vacuum stop valve and the hydrogen stop valve;

[0052] The pressure change in the vacuum chamber is monitored in real time by the vacuum gauge of the negative pressure module, and the difference between the initial vacuum pressure and the final vacuum pressure is finally compared;

[0053] The controller combines the hydrogen pressure of the pressure sensor, the difference between the initial vacuum pressure and the final vacuum pressure of the vacuum gauge, and the temperature data of the temperature regulation module to calculate the permeability of the test piece at the specified pressure and temperature.

[0054] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A hydrogen permeability testing method, characterized in that: It is tested using a hydrogen permeability test device; The hydrogen permeability testing device comprises a hydrogen pressure module, a negative pressure module, a temperature adjustment module, and a test tooling module; The test fixture module includes a vacuum chamber located in the middle, a test piece to be tested is installed in the vacuum chamber of the test fixture module, one end of the test piece to be tested is connected to the hydrogen pressure module, and the other end is closed; both ends of the vacuum chamber are sealed and covered on the test piece and connected to the negative pressure module; the cold and hot fluid chamber is sealed and covered on the outside of the vacuum chamber, and the cold and hot fluid medium is arranged in the cold and hot fluid chamber, and the cold and hot fluid chamber is connected to the temperature regulating module for regulating the temperature of the cold and hot fluid medium through a pipeline; The negative pressure module includes a vacuum gauge, and the vacuum gauge is connected to the vacuum chamber; The hydrogen pressure module includes a pressure sensor, and the pressure sensor is connected to one end of the test piece to be tested; The hydrogen permeability test method is tested according to the following steps: Install the test piece to be tested in the vacuum chamber of the test fixture module so that both ends of the vacuum chamber are sealed and covered on the test piece; Turn on the negative pressure module, adjust the negative pressure in the vacuum chamber to the set value and maintain it; Turn on the hydrogen pressure module, deliver hydrogen into the test piece to be tested and maintain it; Turn on the temperature regulating module to make the temperature in the vacuum chamber meet the experimental requirements and maintain it; Close the vacuum stop valve and the hydrogen stop valve; The pressure change in the vacuum chamber is monitored in real time by the vacuum gauge of the negative pressure module, and the difference between the initial vacuum pressure and the final vacuum pressure is finally compared; The permeability of the test piece at the specified pressure and temperature is finally obtained by calculating the hydrogen pressure of the pressure sensor, the difference between the initial vacuum pressure and the final vacuum pressure of the vacuum gauge, and the temperature data of the temperature control module.

2. The hydrogen permeability testing method according to claim 1, characterized in that: The negative pressure module comprises a vacuum pump and a negative pressure regulating valve, and the vacuum pump is connected to the vacuum chamber through the negative pressure regulating valve.

3. The hydrogen permeability testing method according to claim 2, characterized in that: The negative pressure regulating valve is connected to the vacuum chamber through a vacuum cut-off valve.

4. The hydrogen permeability testing method according to claim 3, characterized in that: The temperature regulating module includes a hot and cold all-in-one machine, a circulation pump and a temperature sensor. One end of the hot and cold all-in-one machine is connected to the outlet of the hot and cold fluid cavity, and the other end of the hot and cold all-in-one machine is connected to the inlet of the hot and cold fluid cavity through the circulation pump. A temperature sensor is provided on the pipeline from the inlet of the hot and cold fluid cavity to the circulation pump.

5. The hydrogen permeability testing method according to claim 4, characterized in that: The temperature regulating module includes a return stop valve and an outlet stop valve. The return stop valve is located between one end of the hot and cold integrated machine and the outlet of the hot and cold fluid cavity, and the outlet stop valve is located between the circulation pump and the inlet of the hot and cold fluid cavity.

6. The hydrogen permeability testing method according to claim 3, characterized in that: The hydrogen pressure module comprises a hydrogen storage device and a regulating valve. The hydrogen storage device is connected to one end of a test piece to be tested through the regulating valve. The pressure sensor is arranged on a pipeline connected to one end of the test piece to be tested.

7. The hydrogen permeability testing method according to claim 6, characterized in that: The hydrogen pressure module includes an electromagnetic shut-off valve and a hydrogen stop valve, the regulating valve includes a primary pressure regulating valve and a secondary pressure regulating valve, the hydrogen storage device is connected to the electromagnetic shut-off valve via the primary pressure regulating valve, the electromagnetic shut-off valve is connected to the hydrogen stop valve via the secondary pressure regulating valve, and the pressure sensor is located on the connecting pipeline between the hydrogen stop valve and one end of the test piece to be tested.

8. The hydrogen permeability testing method according to any one of claims 1 to 7, characterized in that: A heat preservation cavity is arranged outside the cold and hot fluid cavity.

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