Device for testing air tightness of electrolytic cell

Abstract

The invention provides an air tightness testing device for an electrolytic cell, and relates to the technical field of air tightness testing. The electrolytic bath airtightness testing device comprises a gas inlet pipeline, a first gas conveying pipeline and a second gas conveying pipeline, the first gas conveying pipeline and the second gas conveying pipeline are communicated with the gas inlet pipeline, electromagnetic valves and pressure sensors are arranged on the first gas conveying pipeline and the second gas conveying pipeline, and the first gas conveying pipeline is used for being communicated with a hydrogen inlet of an electrolytic bath. The second gas conveying pipeline is used for being communicated with an oxygen inlet of the electrolytic bath. The air tightness testing device for the electrolytic bath can improve the air tightness testing precision.

Description

Technical Field

[0001] The present application relates to the technical field of airtightness testing, and more particularly, to an airtightness testing device for an electrolytic cell. Background Art

[0002] Before the water electrolytic cell for hydrogen production is powered on, it must be subjected to an airtightness test to ensure that hydrogen does not leak. While detecting external leakage, the electrolytic cell also needs to test whether the gas in the hydrogen production chamber leaks into the oxygen production chamber. The intermixing of hydrogen and oxygen inside the electrolytic cell will cause hydrogen loss and even pose a risk of explosion after hydrogen-oxygen mixing.

[0003] The existing airtightness testing device for an electrolytic cell needs to connect the gas source to the electrolytic cell via a buffer tank. Its pressure gauge is installed on the buffer tank, and the buffer tank is also provided with an exhaust port, a safety valve port, an inflation port, etc. Moreover, when performing the airtightness test and pressure holding, it is necessary to keep the buffer tank connected to the electrolytic cell; this testing method increases the influence of leakage at each joint on the buffer tank on the airtightness test of the electrolytic cell; the internal pressure change of the electrolytic cell needs to be detected through the pressure gauge on the buffer tank. Since the internal leakage of the electrolytic cell itself is a small pressure fluctuation and the buffer tank stores a large amount of gas itself, the sensitivity to the internal pressure change of the electrolytic cell will be reduced, thereby reducing the testing accuracy. Summary of the Invention

[0004] The purpose of the present application includes, for example, providing an airtightness testing device for an electrolytic cell, which can improve the airtightness testing accuracy.

[0005] The embodiments of the present application can be implemented as follows:

[0006] The embodiments of the present application provide an airtightness testing device for an electrolytic cell, which includes an inlet gas pipeline, a first gas transmission pipeline, and a second gas transmission pipeline. The first gas transmission pipeline and the second gas transmission pipeline are respectively connected to the inlet gas pipeline. Solenoid valves and pressure sensors are provided on both the first gas transmission pipeline and the second gas transmission pipeline. The first gas transmission pipeline is used to communicate with the hydrogen inlet of the electrolytic cell, and the second gas transmission pipeline is used to communicate with the oxygen inlet of the electrolytic cell.

[0007] Optionally, a back pressure valve is provided on the first gas transmission pipeline.

[0008] Optionally, a pressure reducing valve is provided on the second gas transmission pipeline.

[0009] Optionally, an air compressor and a booster pump are provided on the inlet gas pipeline.

[0010] Optionally, a pneumatic triple unit is provided on the inlet gas pipeline between the air compressor and the booster pump.

[0011] Optionally, a first exhaust pipeline is communicatively connected to the first gas pipeline, and a solenoid valve and a pressure reducing valve are arranged on the first exhaust pipeline.

[0012] Optionally, a first branch pipeline is communicatively connected to the first exhaust pipeline, a ball valve is arranged on the first branch pipeline, and the ball valve on the first branch pipeline is in parallel with the solenoid valve and the pressure reducing valve on the first exhaust pipeline.

[0013] Optionally, a second branch pipeline is communicatively connected to the first exhaust pipeline, a safety valve is arranged on the second branch pipeline, and the safety valve on the second branch pipeline is in parallel with the solenoid valve and the pressure reducing valve on the first exhaust pipeline.

[0014] Optionally, a third branch pipeline is communicatively connected between the first gas pipeline and the first exhaust pipeline, a ball valve is arranged on the third branch pipeline, and the ball valve on the third branch pipeline is in parallel with the solenoid valve on the first gas pipeline.

[0015] Optionally, a second exhaust pipeline is communicatively connected to the second gas pipeline, and a solenoid valve is arranged on the second exhaust pipeline.

[0016] The beneficial effects of the electrolytic cell airtightness testing device provided by the embodiments of the present application include, for example: In order to improve the airtightness testing accuracy, an electrolytic cell airtightness testing device is designed. The electrolytic cell airtightness testing device includes an intake pipeline, a first gas pipeline, and a second gas pipeline. The first gas pipeline and the second gas pipeline are respectively communicatively connected to the intake pipeline. Solenoid valves and pressure sensors are arranged on both the first gas pipeline and the second gas pipeline. The first gas pipeline is used to be communicatively connected to the hydrogen inlet of the electrolytic cell, and the second gas pipeline is used to be communicatively connected to the oxygen inlet of the electrolytic cell.

[0017] When the electrolytic cell airtightness testing device is in use, gas can be respectively transported to the first gas pipeline and the second gas pipeline through the intake pipeline. The first gas pipeline is directly communicatively connected to the hydrogen inlet of the electrolytic cell, and the second gas pipeline is directly communicatively connected to the oxygen inlet of the electrolytic cell. The solenoid valves arranged on the first gas pipeline and the second gas pipeline can control the on-off of the pipelines. The pressure sensors arranged on the first gas pipeline and the second gas pipeline can directly detect the pressure on the pipelines. Compared with the existing testing device provided with a buffer tank, on the one hand, the influence of leakage at each joint of the buffer tank on the electrolytic cell airtightness testing is eliminated, and on the other hand, the sensitivity of the pressure sensor to the internal pressure change of the electrolytic cell is improved, thereby improving the testing accuracy. Description of the Drawings

[0018] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram showing the electrolytic cell airtightness test device in the test state in the embodiments of the present application.

[0020] Icon: 1 - intake pipeline; 11 - air compressor; 12 - pneumatic triple unit; 13 - booster pump; 2 - first gas transmission pipeline; 21 - back pressure valve; 3 - second gas transmission pipeline; 4 - solenoid valve; 5 - pressure sensor; 6 - pressure reducing valve; 7 - first exhaust pipeline; 71 - first branch pipeline; 72 - second branch pipeline; 721 - safety valve; 73 - third branch pipeline; 8 - ball valve; 9 - second exhaust pipeline; 10 - electrolytic cell. Detailed implementation manners

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0023] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0024] In the description of the present application, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application.

[0025] In addition, terms such as "first" and "second" are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0026] It should be noted that, without conflict, the features in the embodiments of the present application can be combined with each other.

[0027] As disclosed in the background art section, the existing airtightness testing device for electrolytic cells needs to connect the gas source to the electrolytic cell through a buffer tank, and its pressure gauge is installed on the buffer tank. The buffer tank is also provided with an exhaust port, a safety valve port, an inflation port, etc. Moreover, when performing airtightness testing and pressure holding, it is necessary to keep the buffer tank connected to the electrolytic cell. This testing method increases the influence of leakage at each joint on the buffer tank on the airtightness testing of the electrolytic cell; the internal pressure change of the electrolytic cell needs to be detected through the pressure gauge on the buffer tank. Since the internal leakage of the electrolytic cell itself is a small pressure fluctuation, and the buffer tank stores a relatively large amount of gas, the sensitivity of the pressure gauge to the internal pressure change of the electrolytic cell will decrease, thereby reducing the testing accuracy. The embodiments of the present application provide an airtightness testing device for electrolytic cells, which is at least used to solve the above technical problems.

[0028] Please refer to Figure 1 , the airtightness testing device for electrolytic cells provided by the embodiments of the present application includes an inlet gas pipeline 1, a first gas transmission pipeline 2 and a second gas transmission pipeline 3. The first gas transmission pipeline 2 and the second gas transmission pipeline 3 are respectively connected to the inlet gas pipeline 1. Solenoid valves 4 and pressure sensors 5 are provided on both the first gas transmission pipeline 2 and the second gas transmission pipeline 3. The first gas transmission pipeline 2 is used to communicate with the hydrogen inlet of the electrolytic cell 10, and the second gas transmission pipeline 3 is used to communicate with the oxygen inlet of the electrolytic cell 10. Among them, the pressure sensor 5 can be selected as a pressure transmitter.

[0029] It should be noted that the electrolytic cell 10 has a hydrogen production chamber and an oxygen production chamber inside. The hydrogen inlet of the electrolytic cell 10 is communicated with the hydrogen production chamber, and the oxygen inlet of the electrolytic cell 10 is communicated with the oxygen production chamber. During the process of performing airtightness testing on the electrolytic cell 10, it is not only necessary to perform airtightness testing on the hydrogen production chamber and the oxygen production chamber separately, but also necessary to test whether there is leakage between the hydrogen production chamber and the oxygen production chamber.

[0030] When the airtightness test device of the electrolytic cell is in use, gas can be conveyed to the first gas pipeline 2 and the second gas pipeline 3 respectively through the air inlet pipeline 1. The first gas pipeline 2 is directly connected to the hydrogen inlet of the electrolytic cell 10, and the second gas pipeline 3 is directly connected to the oxygen inlet of the electrolytic cell 10. The solenoid valves 4 provided on the first gas pipeline 2 and the second gas pipeline 3 can control the on-off of the pipelines, and the pressure sensors 5 provided on the first gas pipeline 2 and the second gas pipeline 3 can directly detect the pressure on the pipelines. Compared with the existing test device with a buffer tank, on the one hand, the influence of leakage at each joint of the buffer tank on the airtightness test of the electrolytic cell 10 is eliminated, and on the other hand, since the pressure sensor 5 is arranged on the gas pipeline, the sensitivity of the pressure sensor 5 to the internal pressure change of the electrolytic cell 10 is improved, thereby improving the test accuracy.

[0031] In this embodiment, a back pressure valve 21 is arranged on the first gas pipeline 2.

[0032] When the electrolytic cell 10 is subjected to the high-pressure side airtightness test, it is necessary to make the hydrogen production chamber reach the pressure set value, which is set by the back pressure valve 21. For example, the pressure set by the back pressure valve 21 is 3.5 Mpa. The gas passes through the back pressure valve 21 on the first gas pipeline 2 and then enters the hydrogen production chamber until the pressure of the hydrogen production chamber reaches 3.5 Mpa, and then the pressure is maintained for a period of time. After the pressure maintaining time ends, the test is completed.

[0033] In this embodiment, a pressure reducing valve 6 is arranged on the second gas pipeline 3.

[0034] When the electrolytic cell 10 is subjected to the low-pressure side airtightness test, it is necessary to make the oxygen production chamber reach the pressure set value, which is set by the pressure reducing valve 6. For example, the pressure set by the pressure reducing valve 6 is 0.5 Mpa. The gas passes through the pressure reducing valve 6 on the second gas pipeline 3 and then enters the oxygen production chamber until the pressure of the oxygen production chamber reaches 0.5 Mpa, and then the pressure is maintained for a period of time. After the pressure maintaining time ends, the test is completed.

[0035] It should be noted that when the electrolytic cell 10 is subjected to the high-pressure side airtightness test or the low-pressure side airtightness test, the pressure maintaining time is about 22 hours.

[0036] In this embodiment, an air compressor 11 and a booster pump 13 are arranged on the air inlet pipeline 1.

[0037] During the air intake process, the air compressor 11 is turned on, and the generated gas is first pressurized by the booster pump 13. In the case of the high-pressure side airtightness test, the gas is pressurized by the booster pump 13 and then enters the first gas pipeline 2; in the case of the low-pressure side airtightness test, the gas is pressurized by the booster pump 13 and then enters the second gas pipeline 3.

[0038] In addition, a pneumatic triple unit 12 is arranged on the air inlet pipeline 1 between the air compressor 11 and the booster pump 13.

[0039] It should be noted that the pneumatic triple unit 12 is mainly composed of three air source treatment components, namely an air filter, a pressure reducing valve 6, and an oil mist separator, which are used to remove impurities such as moisture, dust, and oil in the compressed air to ensure the cleanliness of the air source.

[0040] In this embodiment, a first exhaust pipe 7 is communicatively connected to the first gas pipeline 2, and a solenoid valve 4 and a pressure reducing valve 6 are provided on the first exhaust pipe 7.

[0041] The exhaust pressure is set by the pressure reducing valve 6 on the first exhaust pipe 7 to discharge the gas in the electrolytic cell 10, and this exhaust pressure can be set to 0.1 Mpa.

[0042] After the airtightness test of the high-pressure side of the electrolytic cell 10 is completed, the solenoid valve 4 on the first gas pipeline 2 and the solenoid valve 4 on the first exhaust pipe 7 are opened. The gas in the electrolytic cell 10 is discharged through the first gas pipeline 2 to the first exhaust pipe 7, and finally discharged after being decompressed by the pressure reducing valve 6 on the first exhaust pipe 7.

[0043] In this embodiment, a first branch pipe 71 is communicatively connected to the first exhaust pipe 7, a ball valve 8 is provided on the first branch pipe 71, and the ball valve 8 on the first branch pipe 71 is connected in parallel with the solenoid valve 4 and the pressure reducing valve 6 on the first exhaust pipe 7.

[0044] By connecting the ball valve 8 on the first branch pipe 71 in parallel with the solenoid valve 4 and the pressure reducing valve 6 on the first exhaust pipe 7, once the solenoid valve 4 on the first exhaust pipe 7 fails, the ball valve 8 on the first branch pipe 71 can be manually opened for exhaust.

[0045] In this embodiment, a second branch pipe 72 is communicatively connected to the first exhaust pipe 7, a safety valve 721 is provided on the second branch pipe 72, and the safety valve 721 on the second branch pipe 72 is connected in parallel with the solenoid valve 4 and the pressure reducing valve 6 on the first exhaust pipe 7.

[0046] By connecting the safety valve 721 on the second branch pipe 72 in parallel with the solenoid valve 4 and the pressure reducing valve 6 on the first exhaust pipe 7, if the solenoid valve 4 on the first exhaust pipe 7 is not working and the pressure in the first exhaust pipe 7 is too high, the safety valve 721 on the second branch pipe 72 will automatically open for exhaust.

[0047] The pressure set by the safety valve 721 is greater than the pressure set by the back pressure valve 21. For example, the pressure set by the safety valve 721 is 1.1 times the pressure set by the back pressure valve 21.

[0048] In this embodiment, a third branch pipeline 73 is connected between the first gas supply pipeline 2 and the first exhaust pipeline 7. A ball valve 8 is provided on the third branch pipeline 73, and the ball valve 8 on the third branch pipeline 73 is connected in parallel with the solenoid valve 4 on the first gas supply pipeline 2.

[0049] By connecting the ball valve 8 on the third branch pipeline 73 in parallel with the solenoid valve 4 on the first gas supply pipeline 2, when the solenoid valve 4 on the first gas supply pipeline 2 fails to open, the ball valve 8 on the third branch pipeline 73 can be manually opened, and the gas in the electrolytic cell 10 can be discharged to the first exhaust pipeline 7 through the third branch pipeline 73, so as to discharge the gas in time.

[0050] In this embodiment, a second exhaust pipeline 9 is connected to the second gas supply pipeline 3, and a solenoid valve 4 is provided on the second exhaust pipeline 9.

[0051] After the airtightness test of the low-pressure side of the electrolytic cell 10 is completed, the solenoid valve 4 on the second gas supply pipeline 3 and the solenoid valve 4 on the second exhaust pipeline 9 are opened, and the gas in the electrolytic cell 10 is discharged after passing through the second gas supply pipeline 3 and then to the second exhaust pipeline 9.

[0052] The working principle of the electrolytic cell airtightness test device provided by the embodiment of the present application is as follows:

[0053] When the high-pressure side airtightness test of the electrolytic cell 10 is carried out, the solenoid valve 4 on the first gas supply pipeline 2 is in the open state, and the solenoid valve 4 on the first exhaust pipeline 7, the solenoid valve 4 on the second gas supply pipeline 3, the solenoid valve 4 on the second exhaust pipeline 9, the ball valve 8 on the first branch pipeline 71, and the ball valve 8 on the third branch pipeline 73 are all in the closed state.

[0054] Turn on the air compressor 11. The generated gas passes through the pneumatic triple unit 12 to remove solid impurities and moisture in the gas. The gas then passes through the booster pump 13 to increase the pressure of the gas. The pressurized gas enters the hydrogen inlet of the electrolyzer 10 after passing through the solenoid valve 4 and the backpressure valve 21 on the first gas pipeline 2 until the pressure sensor 5 on the first gas pipeline 2 reaches the pressure set value. After the pressure set value is stable for dozens of seconds, control the solenoid valve 4 on the first exhaust pipeline 7 to close, so that the pressure in the hydrogen production chamber is maintained at the pressure set value. After maintaining the pressure for the specified time according to the test standard, according to the data of the pressure sensor 5 on the first gas pipeline 2 and the pressure sensor 5 on the second gas pipeline 3, the pressure change data curve during the pressure holding period can be plotted and the leakage rate can be calculated; if the pressure on the second gas pipeline 3 increases, it indicates that there is a leakage inside the electrolyzer 10, that is, the gas in the hydrogen production chamber leaks into the oxygen production chamber. After the test is completed, turn on the solenoid valve 4 on the first gas pipeline 2 and the solenoid valve 4 on the first exhaust pipeline 7. The gas in the electrolyzer 10 is finally discharged after being decompressed by the pressure reducing valve 6 on the first exhaust pipeline 7. If there is pressure in the second gas pipeline 3, after the high-pressure side gas is exhausted, turn on the solenoid valve 4 on the second gas pipeline 3 and the solenoid valve 4 on the second exhaust pipeline 9 to discharge the low-pressure side gas.

[0055] When the electrolyzer 10 is tested for airtightness of the low-pressure side, the solenoid valve 4 on the first gas pipeline 2, the solenoid valve 4 on the first exhaust pipeline 7, the ball valve 8 on the first branch pipeline 71, the ball valve 8 on the third branch pipeline 73, and the solenoid valve 4 on the second exhaust pipeline 9 are all in the closed state, and the solenoid valve 4 on the second gas pipeline 3 is in the open state.

[0056] The gas generated by the air compressor 11 is filtered through the pneumatic triple unit 12, then pressurized by the booster pump 13, and then enters the oxygen inlet of the electrolyzer 10 after passing through the pressure reducing valve 6 and the solenoid valve 4 on the second gas pipeline 3 until the pressure sensor 5 on the second gas pipeline 3 reaches the pressure set value. After the pressure set value is stable for more than ten seconds, close the solenoid valve 4 on the second gas pipeline 3, maintain the pressure for the specified time. After the test is completed, turn on the solenoid valve 4 on the second gas pipeline 3 and the solenoid valve 4 on the second exhaust pipeline 9 to empty the gas in the electrolyzer 10. The leakage rate can be calculated according to the data of the pressure sensor 5 on the second gas pipeline 3.

[0057] When the differential pressure airtightness test is carried out on the electrolytic cell 10 simultaneously, first inflate the high-pressure side, and then inflate the low-pressure side, so that both the hydrogen production chamber and the oxygen production chamber of the electrolytic cell 10 reach the corresponding pressure set values and maintain the pressure for a specified time. After the test is completed, first open the solenoid valve 4 on the first gas pipeline 2 and the solenoid valve 4 on the first exhaust pipeline 7 to discharge the high-pressure gas in the hydrogen production chamber of the electrolytic cell 10 until the value displayed by the pressure sensor 5 on the first gas pipeline 2 is zero, then close the solenoid valve 4 on the first gas pipeline 2 and the solenoid valve 4 on the first exhaust pipeline 7. Subsequently, open the solenoid valve 4 on the second gas pipeline 3 and the solenoid valve 4 on the second exhaust pipeline 9 to discharge the low-pressure gas in the oxygen production chamber of the electrolytic cell 10. Finally, analyze the gas leakage rate according to the data collected by the pressure sensor 5 on the first gas pipeline 2 and the pressure sensor 5 on the second gas pipeline 3.

[0058] In summary, the embodiment of the present application provides an electrolytic cell airtightness test device. When the electrolytic cell airtightness test device is in use, the gas pipeline 1 can respectively convey gas to the first gas pipeline 2 and the second gas pipeline 3. The first gas pipeline 2 is directly connected to the hydrogen inlet of the electrolytic cell 10, and the second gas pipeline 3 is directly connected to the oxygen inlet of the electrolytic cell 10. The solenoid valve 4 provided on the first gas pipeline 2 and the second gas pipeline 3 can control the on-off of the pipeline. The pressure sensor 5 provided on the first gas pipeline 2 and the second gas pipeline 3 can directly detect the pressure on the pipeline. Compared with the existing test device provided with a buffer tank, on the one hand, the influence of the leakage of each joint on the buffer tank on the airtightness test of the electrolytic cell 10 is eliminated, and on the other hand, the sensitivity of the pressure sensor 5 to the internal pressure change of the electrolytic cell 10 is improved, thereby improving the test accuracy.

[0059] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An electrolytic cell airtightness testing device, characterized in that It includes an intake pipeline, a first gas transmission pipeline, and a second gas transmission pipeline. The first gas transmission pipeline and the second gas transmission pipeline are respectively connected to the intake pipeline. Solenoid valves and pressure sensors are provided on both the first gas transmission pipeline and the second gas transmission pipeline. The first gas transmission pipeline is used to communicate with the hydrogen inlet of the electrolytic cell, and the second gas transmission pipeline is used to communicate with the oxygen inlet of the electrolytic cell.

2. The electrolytic cell airtightness test device according to claim 1, characterized in that A back pressure valve is provided on the first gas transmission pipeline.

3. The electrolytic cell airtightness test device according to claim 1, characterized in that, A pressure reducing valve is provided on the second gas transmission pipeline.

4. The electrolytic cell airtightness testing device according to claim 1, characterized in that, An air compressor and a booster pump are provided on the intake pipeline.

5. The electrolytic cell airtightness testing device according to claim 4, wherein, A pneumatic triple unit is provided on the intake pipeline between the air compressor and the booster pump.

6. The electrolytic cell airtightness test device according to claim 1, characterized in that, A first exhaust pipeline is connected to the first gas transmission pipeline. Solenoid valves and pressure reducing valves are provided on the first exhaust pipeline.

7. The electrolytic cell airtightness testing device according to claim 6, characterized in that, A first branch pipeline is connected to the first exhaust pipeline. A ball valve is provided on the first branch pipeline. The ball valve on the first branch pipeline is in parallel with the solenoid valve and the pressure reducing valve on the first exhaust pipeline.

8. The electrolytic cell airtightness testing device according to claim 6, characterized in that, A second branch pipeline is connected to the first exhaust pipeline. A safety valve is provided on the second branch pipeline. The safety valve on the second branch pipeline is in parallel with the solenoid valve and the pressure reducing valve on the first exhaust pipeline.

9. The electrolytic cell airtightness testing device according to claim 6, characterized in that, A third branch pipeline is connected between the first gas transmission pipeline and the first exhaust pipeline. A ball valve is provided on the third branch pipeline. The ball valve on the third branch pipeline is in parallel with the solenoid valve on the first gas transmission pipeline.

10. The electrolytic cell airtightness test device according to claim 1, characterized in that, A second exhaust pipeline is connected to the second gas transmission pipeline. A solenoid valve is provided on the second exhaust pipeline.

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