Detection device

Abstract

This invention provides a detection device, including a pressurizing device and a detection device. The pressurizing device includes a gas storage unit, a driving unit, and a pressurizing unit. The gas storage unit and the driving unit are connected in parallel to the pressurizing unit. The gas storage unit stores detection gas. The pressurizing unit is connected to the gas storage unit and / or an external detection gas source to receive and pressurize the detection gas from the gas storage unit and / or the external detection gas source. The driving unit drives the pressurizing unit. The pressurizing unit is detachably connected to the hydrogen system to be tested and is used to deliver pressurized detection gas into the hydrogen system. The detection device is independent of the pressurizing device and includes multiple independent detection units. Each detection unit can be individually connected to a hydrogen system to be tested for detecting the airtightness of the hydrogen system. This design allows the detection device to simultaneously perform airtightness testing operations on multiple hydrogen systems, reducing waiting time during the testing process and improving efficiency.

Description

Technical Field

[0001] This utility model relates to the field of gas tightness detection technology for hydrogen systems, and in particular to a detection device. Background Technology

[0002] In hydrogen systems used as storage and supply facilities for hydrogen fuel, the fuel is generally in a gaseous state at high pressure, thus requiring extremely high airtightness. Currently, before using a hydrogen system, an airtightness test must be performed to confirm that the sealing and pressure resistance of components such as gas cylinders and valves within the system are up to standard.

[0003] Currently, in the process of testing the airtightness of hydrogen systems, the testing device often needs to maintain a continuous connection with the hydrogen system under test, meaning it can only be tested one-to-one, with one system being tested before the next can be tested. This testing process typically takes several hours, resulting in low efficiency. During hydrogen production, each system requires airtightness testing. If there are multiple systems to be tested, multiple testing devices are needed, leading to high testing costs. Utility Model Content

[0004] The purpose of this invention is to provide a detection device that can simultaneously detect the airtightness of multiple hydrogen systems, reduce waiting time during the detection process on the production line, improve detection efficiency, and reduce production costs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] According to one aspect of this application, this application provides a gas tightness detection device for a hydrogen system, the detection device comprising:

[0007] A pressurization device includes a gas storage unit, a drive unit, and a pressurization unit. The gas storage unit and the drive unit are connected in parallel to the pressurization unit. The gas storage unit stores detection gas. The pressurization unit is connected to the gas storage unit and / or an external detection gas source to receive and pressurize the detection gas from the gas storage unit and / or the external detection gas source. The drive unit drives the pressurization unit. The pressurization unit is detachably connected to a hydrogen system to be tested and is used to deliver pressurized detection gas into the hydrogen system to be tested.

[0008] The detection device is set up independently of the pressurization device. The detection device includes multiple independent detection units, each of which can be individually connected to a hydrogen system to be tested for detecting the airtightness of the hydrogen system to be tested.

[0009] In some embodiments, each of the detection units is configured to communicate with a high-pressure sensor and a low-pressure sensor of the hydrogen system, wherein the high-pressure sensor is configured to detect the real-time high-pressure signal of the hydrogen system and the low-pressure sensor is configured to detect the real-time low-pressure signal of the hydrogen system.

[0010] The detection unit is also communicatively connected to the temperature sensor of the hydrogen system, or the detection device further includes multiple temperature detectors, each of the detection units being communicatively connected to the temperature sensor or one of the temperature detectors, the temperature sensor or the temperature detector being used to detect the real-time temperature signal of the hydrogen system;

[0011] The detection unit is used to obtain a first airtightness signal based on the initial high-pressure signal and initial temperature signal received at the start of the preset time and the real-time high-pressure signal and real-time temperature signal received at the end of the preset time, and to obtain a second airtightness signal based on the initial low-pressure signal and initial temperature signal received at the start of the preset time and the real-time low-pressure signal and real-time temperature signal received at the end of the preset time.

[0012] In some embodiments, the detection device further includes an alarm, which is communicatively connected to each of the detection units and is used to issue different alarm signals based on a first airtightness signal or a second airtightness signal from each of the detection units.

[0013] The detection equipment also includes a digital platform, which is communicatively connected to multiple detection units and is used to receive and analyze signals from the multiple detection units.

[0014] The detection device also includes a display, which is communicatively connected to the digital platform and used to display visualized real-time airtightness data.

[0015] In some embodiments, the gas storage unit is connected to the pressurization unit, or both the gas storage unit and the external detection gas source are connected to the pressurization unit;

[0016] The gas storage unit is connected to the inlet of the booster unit via a gas supply pipeline; the booster unit is connected to an external detection gas source via an air intake pipeline, and the air intake pipeline is equipped with a valve for controlling its on / off state.

[0017] In some embodiments, the booster unit includes a booster pump and a reversing valve. The inlet of the booster pump is connected to the air intake pipeline and the air supply pipeline, and the outlet of the booster pump is connected to the hydrogen system. The reversing valve is connected to the drive unit and the booster pump. The reversing valve is used to control the on / off connection between the booster pump and the drive unit.

[0018] The reversing valve is a two-position four-way valve.

[0019] In some embodiments, the intake pipe is connected in parallel with the supply pipe and connected to the inlet of the booster pump through a main gas transmission pipe;

[0020] The main gas pipeline is equipped with a first filter, which is located downstream of the gas inlet pipeline and the gas supply pipeline. The first filter is used to filter the detection gas.

[0021] The gas main is equipped with a first regulating valve, which is located downstream of the first filter. The first regulating valve is used to adjust the opening of the gas main.

[0022] In some embodiments, the main gas pipeline is further provided with two pressure detection devices, which are respectively located at the inlet end and the outlet end of the first regulating valve, so as to detect the pressure signal in the main gas pipeline.

[0023] The main gas pipeline is also equipped with a switch valve for controlling its on / off state, and the switch valve is located downstream of the first regulating valve.

[0024] In some embodiments, the drive unit includes a second filter, which is connected to an external drive gas source and is connected to the reversing valve via a connecting pipe. The second filter is used to filter the drive gas.

[0025] The drive unit further includes a second regulating valve and a pneumatic switch connected in parallel downstream of the second filter. The second regulating valve is located on the connecting pipeline and is used to regulate the opening of the connecting pipeline. The pneumatic switch is connected between the second filter and the reversing valve through a pneumatic pipeline and is used to control the on / off state of the pneumatic pipeline.

[0026] A pressure detector is provided downstream of the second regulating valve. The pressure detector is communicatively connected to the second regulating valve and is used to detect the pressure signal at the outlet of the second regulating valve.

[0027] A safety valve is also provided downstream of the second regulating valve. The safety valve is communicatively connected to the pressure detector and is used to relieve pressure on the drive unit.

[0028] In some embodiments, the outlet of the pressurization unit is connected to an outlet pipeline, which is used for detachable connection with the hydrogen system and for delivering detection gas; the outlet pipeline is provided with a shut-off valve for controlling its on / off state.

[0029] A cooler is also provided on the outlet pipe, which is used to reduce the temperature of the detection gas in the outlet pipe.

[0030] In some embodiments, a pressure gauge is provided on the air outlet pipe, and the pressure gauge is used to detect the pressure signal inside the air outlet pipe.

[0031] The gas outlet pipe is connected to a pressure relief pipe, which is used to discharge the detection gas to the outside.

[0032] The pressure relief pipeline is equipped with a pressure relief valve, which is communicatively connected to the pressure gauge. The pressure relief valve is used to control the opening and closing of the pressure relief pipeline according to the pressure signal from the pressure gauge.

[0033] The outlet pipe and the pressure relief pipe are connected through a discharge pipe. The connection point between the discharge pipe and the outlet pipe is located downstream of the pressure gauge, and the connection point between the discharge pipe and the pressure relief pipe is located downstream of the pressure relief valve. The discharge pipe is equipped with an unloading valve for controlling its on / off state.

[0034] As can be seen from the above technical solution, this utility model has at least the following advantages and positive effects:

[0035] The pressurization and detection devices of the detection apparatus are set up independently, allowing them to operate independently. Since the pressurization unit of the pressurization device is detachably connected to the hydrogen system to be tested, in practical applications, the pressurization unit can be connected to the hydrogen system to deliver pressurized detection gas into it. After pressurization is complete, the pressurization device can be detached from the pressurized hydrogen system to allow it to be connected to the next hydrogen system to deliver pressurized detection gas. Simultaneously, because the multiple detection units of the detection apparatus are independent and can operate independently, after filling one hydrogen system with detection gas, a single detection unit of the detection apparatus can be used to detect the airtightness signal of that hydrogen system. This process is repeated until all hydrogen systems to be tested are filled with detection gas, and all systems are simultaneously tested for airtightness.

[0036] In other words, the above design enables a single pressurization device to deliver detection gas to multiple hydrogen systems, and a single detection device to simultaneously detect the airtightness signals of multiple hydrogen systems. By parallelizing the detection gas filling and airtightness detection operations of multiple hydrogen systems, the waiting time in the entire detection process can be reduced, thereby improving detection efficiency and reducing production costs. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the detection device in this embodiment.

[0038] Figure 2 yes Figure 1 Enlarged structural diagram at point D.

[0039] The annotations in the attached figures are explained as follows:

[0040] 100. Boosting equipment; 1. Gas storage unit; 11. Gas cylinder; 2. Drive unit; 21. Second filter; 22. Connecting pipeline; 23. Second regulating valve; 24. Air drive switch; 25. Air drive pipeline; 26. Pressure detector; 27. Safety valve; 3. Boosting unit; 31. Boosting pump; 311. Housing; 312. First piston; 313. Second piston; 314. First chamber; 315. Second chamber; 316. Third chamber; 317. Fourth chamber; 32. Reversing valve; 33. First Limit switch; 34. Second limit switch; 35. First check valve; 36. Second check valve; 37. Third check valve; 38. Fourth check valve; 41. Gas supply line; 42. Inlet line; 43. Main gas supply line; 44. Valve; 45. First filter; 46. First regulating valve; 47. Pressure sensor; 48. Switch valve; 51. Outlet line; 52. Shut-off valve; 53. Cooler; 54. Pressure gauge; 55. Pressure relief line; 56. Pressure relief valve; 57. Discharge line; 58. Unloading valve;

[0041] 200. Testing equipment; 6. Testing unit; 7. Digital platform; 8. Display;

[0042] 300. Hydrogen system; 310. High pressure sensor; 320. Low pressure sensor; 330. Temperature sensor. Detailed Implementation

[0043] Typical embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0044] In the description of this application, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back, etc.) are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications also change accordingly.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] This application provides a detection device for detecting the airtightness of a hydrogen system.

[0047] The hydrogen system includes storage cylinders, pipelines connecting to the storage cylinders, various valves, and various detection elements. The storage cylinders are used to store hydrogen fuel. The pipelines are divided into high-pressure pipelines and low-pressure pipelines. The various detection elements include high-pressure sensors, low-pressure sensors, and temperature sensors. Specifically, the high-pressure sensors are arranged along the high-pressure pipelines to detect the real-time high-pressure signal; the low-pressure sensors are arranged along the low-pressure pipelines to detect the real-time low-pressure signal; and the temperature sensors detect the real-time temperature signal of the hydrogen system, facilitating real-time monitoring of the system's status.

[0048] Specifically, in the process of detecting the airtightness of a hydrogen system, at the start of a preset time, the real-time high-pressure signal detected by the high-pressure sensor is the initial high-pressure signal, the real-time low-pressure signal detected by the low-pressure sensor is the initial low-pressure signal, and the real-time temperature signal detected by the temperature sensor is the initial temperature signal. A first airtightness signal is obtained based on the initial high-pressure and initial temperature signals received at the start and end of the preset time, and a second airtightness signal is obtained based on the initial low-pressure and initial temperature signals received at the start and end of the preset time. Thus, the airtightness status of the hydrogen system can be determined.

[0049] The preset time can be 4 to 8 hours.

[0050] It should be noted that this application does not improve the hydrogen system, and its related structure can be referred to the prior art.

[0051] The following detailed description of specific embodiments of the detection device of this application, in conjunction with the accompanying drawings, provides a comprehensive overview.

[0052] Figure 1 This is a schematic diagram of the detection device in this embodiment.

[0053] refer to Figure 1 The testing device includes a pressurizing device 100 and a testing device 200.

[0054] In this embodiment, the pressurization device 100 includes a gas storage unit 1, a drive unit 2, and a pressurization unit 3. The gas storage unit 1 and the drive unit 2 are connected in parallel to the pressurization unit 3. The gas storage unit 1 stores the detection gas. The pressurization unit 3 is connected to the gas storage unit 1 and / or an external detection gas source to receive and pressurize the detection gas from the gas storage unit 1 and / or the external detection gas source. The drive unit 2 drives the pressurization unit 3. The pressurization unit 3 is detachably connected to the hydrogen system 300 to be tested and is used to deliver the pressurized detection gas into the hydrogen system 300.

[0055] Specifically, the gas to be detected can be nitrogen.

[0056] Specifically, the gas storage unit 1 is connected to the pressurization unit 3, or both the gas storage unit 1 and the external detection gas source are connected to the pressurization unit 3. This design enables the stable supply of detection gas to the pressurization unit 3, thereby improving the working stability of the pressurization device 100.

[0057] The gas storage unit 1 is connected to the inlet of the pressurization unit 3 via a gas supply pipeline 41. Specifically, the gas storage unit 1 includes at least one gas cylinder 11, which is used to store the detection gas. When there are multiple gas cylinders 11, they are connected in parallel.

[0058] The booster unit 3 is connected to an external detection air source via an intake pipe 42. Optionally, the intake pipe 42 is provided with a valve 44 for controlling its opening and closing. Specifically, the valve 44 is a manually controlled valve. In other embodiments, the valve 44 may also be an electrically operated valve.

[0059] Optionally, the intake pipe 42 and the supply pipe 41 are connected in parallel and then connected to the inlet of the booster unit 3 via the main gas supply pipe 43. This design allows the detection gas output from the storage unit 1 and the detection gas from an external detection gas source to be combined and delivered to the booster unit 3 together, optimizing the pipeline layout, reducing the number of pipelines used, and lowering costs. When there are multiple gas cylinders 11, they are connected in parallel to the main gas supply pipe 43, with each gas cylinder 11 connected to the main gas supply pipe 43 via its own supply pipe 41.

[0060] Optionally, a first filter 45 is provided on the gas main pipe 43. The first filter 45 is located downstream of the gas inlet pipe 42 and the gas supply pipe 41. The first filter 45 is used to filter the detection gas to remove impurities carried in the detection gas entering the gas main pipe 43, so as to ensure the cleanliness of the detection gas flowing to the pressurization unit 3.

[0061] The gas main pipe 43 is also equipped with a first regulating valve 46. By adjusting the opening of the first regulating valve 46, the opening of the gas main pipe 43 can be adjusted to achieve the flow rate regulation of the detection gas in the gas main pipe 43.

[0062] The main gas pipeline 43 is also equipped with two pressure sensors 47, which are located at the inlet and outlet ends of the first regulating valve 46, respectively, to detect the pressure signal within the main gas pipeline 43. In practical applications, the opening of the first regulating valve 46 can be adjusted according to the pressure signals from the two pressure sensors 47 to regulate the flow rate of the gas being detected within the main gas pipeline 43.

[0063] Optionally, the gas main 43 is further provided with a switching valve 48 for controlling its on / off state, and the switching valve 48 is located downstream of the first regulating valve 46. Specifically, the switching valve 48 can be a manually controlled valve. In other embodiments, the switching valve 48 can also be an electrically operated valve.

[0064] The drive unit 2 includes a second filter 21, which is connected to an external drive gas source and connected to the booster unit 3 via a connecting pipe 22. The second filter 21 is used to filter the drive gas to remove impurities. The drive gas is compressed air, and its pressure is greater than that of the detection gas provided by the external detection gas source or the gas storage unit 1.

[0065] The drive unit 2 also includes a second regulating valve 23 and a pneumatic switch 24 connected in parallel downstream of the second filter 21.

[0066] The second regulating valve 23 is located on the connecting pipe 22. By adjusting the opening of the second regulating valve 23, the opening of the connecting pipe 22 can be adjusted to achieve the flow regulation of the driving gas.

[0067] The pneumatic switch 24 is connected downstream of the second filter 21 via the pneumatic pipeline 25, and the pneumatic switch 24 is used to control the on / off state of the pneumatic pipeline 25.

[0068] A pressure detector 26 is provided downstream of the second regulating valve 23. The pressure detector 26 is communicatively connected to the second regulating valve 23 and is used to detect the pressure signal at the outlet of the second regulating valve 23.

[0069] Downstream of the second regulating valve 23, a safety valve 27 is also provided. The safety valve 27 is communicatively connected to the pressure detector 26. The safety valve 27 can open when the pressure signal from the pressure detector 26 exceeds a preset value to relieve pressure on the drive unit 2, ensuring the safe operation of the booster equipment 100. Alternatively, the safety valve 27 can be manually controlled based on the pressure signal from the pressure detector 26.

[0070] Figure 2 for Figure 1 Enlarged structural diagram at point D.

[0071] refer to Figure 1 and Figure 2In this embodiment, the booster unit 3 includes a booster pump 31 and a reversing valve 32. The inlet of the booster pump 31 is connected to the air intake pipe 42 and the air supply pipe 41, and the outlet of the booster pump 31 is connected to the hydrogen system 300. Exemplarily, the booster pump 31 includes a housing 311 and a first piston 312.

[0072] The outer casing 311 is provided with a first inlet A1, which is connected to the air intake pipe 42 and the air supply pipe 41, that is, the first inlet A1 is connected to the main air supply pipe 43. Optionally, a first one-way valve 35 is provided at the first inlet A1 to ensure that the detection gas can only flow into the outer casing 311 from the main air supply pipe 43, thereby preventing the detection gas from flowing back during the pressurization process and ensuring the normal operation of the booster pump 31.

[0073] The housing 311 is provided with a first outlet B1. Optionally, a second check valve 36 is provided at the first outlet B1 to ensure that the detection gas can only flow into the housing 311 from the main gas supply pipe 43, thereby preventing the detection gas from flowing back during the pressurization process and ensuring the normal operation of the booster pump 31.

[0074] The first piston 312 is movably disposed inside the outer casing 311 and is sealed to the inner wall of the outer casing 311. The first piston 312 and the outer casing 311 enclose two independent first cavities 314 and second cavities 315. The first cavity 314 communicates with the first inlet A1 and the first outlet B1. The cross-sectional area of ​​the first cavity 314 is smaller than that of the second cavity 315. The volume of the first cavity 314 is variable, while the volume of the second cavity 315 is fixed.

[0075] The outer casing 311 is also provided with a first driving gas inlet C1, which is connected to the second cavity 315. The first driving gas inlet C1 is used to allow driving gas to enter the second cavity 315, so that a pressure difference is formed inside the first cavity 314 and the second cavity 315, thereby driving the first piston 312 to move inside the outer casing 311, thereby reducing the volume of the first cavity 314 and compressing the detection gas inside the first cavity 314, thereby pressurizing the detection gas. When the detection gas inside the first cavity 314 is pressurized to a pressure greater than the first preset pressure, the second one-way valve 36 opens.

[0076] The driving gas is compressed air.

[0077] Optionally, the booster pump 31 further includes a second piston 313, which is movably disposed inside the housing 311 and is sealed to the inner wall of the housing 311. The second piston 313 is connected to the first piston 312, and the second piston 313 and the first piston 312 are arranged collinearly. In this case, the second piston 313 and the housing 311 enclose and form an independent third cavity 316 and a fourth cavity 317. The cross-sectional area of ​​the third cavity 316 is smaller than that of the fourth cavity 317, the volume of the third cavity 316 is variable, and the volume of the fourth cavity 317 is fixed.

[0078] The outer casing 311 is also provided with a second inlet A2, which is connected to the first outlet B1 and communicates with the third chamber 316. Optionally, a third one-way valve 37 is provided at the second inlet A2 to ensure that the detection gas can only flow from the first outlet B1 to the second inlet A2 and enter the third chamber 316, thus preventing backflow of the detection gas during the pressurization process and ensuring the normal operation of the booster pump 31.

[0079] The outer casing 311 is provided with a second outlet B2, which communicates with the third chamber 316. Optionally, a fourth check valve 38 is provided at the second outlet B2 to ensure that the detection gas can only flow out of the third chamber 316, thereby preventing backflow of the detection gas and ensuring the normal operation of the booster pump 31.

[0080] The outer casing 311 is also provided with a second driving gas inlet C2, which is connected to the fourth chamber 317. The second driving gas inlet C2 is used to allow driving gas to enter the fourth chamber 317, so that a pressure difference is formed inside the first chamber 314 and the second chamber 315, thereby driving the second piston 313 to move inside the outer casing 311, thereby reducing the volume of the third chamber 316 and compressing the detection gas inside the third chamber 316, thereby achieving secondary pressurization of the detection gas. When the detection gas inside the third chamber 316 is pressurized to a pressure greater than the second preset pressure, the third one-way valve 37 opens.

[0081] The booster pump 31 also includes a first limit switch 33 and a second limit switch 34 disposed on the inner wall of the housing 311. The first limit switch 33 is arranged corresponding to the first cavity 314, and is collinear with the first piston 312, with the first limit switch 33 located on the side of the first piston 312 away from the second piston 313. The second limit switch 34 is arranged corresponding to the third cavity 316, and is collinear with the second piston 313, with the second limit switch 34 located on the side of the second piston 313 away from the first piston 312.

[0082] Both the first limit switch 33 and the second limit switch 34 can be pneumatically driven switches 24. The second limit switch 34 is connected to the pneumatic drive line 25.

[0083] The reversing valve 32 is connected to the connecting pipe 22 and the pneumatic drive pipe 25, and is located downstream of the pneumatic drive switch 24. The reversing valve 32 is a two-position four-way valve, and includes a housing and a drive piston.

[0084] The housing has a first drive port D1 and a second drive port D2 that communicate with its interior, located at opposite ends of the housing. The first drive port D1 is connected to the pneumatic drive line 25. The second drive port D2 is connected to the first limit switch 33 and the second limit switch 34.

[0085] The housing is also provided with a first working port P1, a second working port P2, and a third working port P3 that communicate with its interior. The first working port P1 can communicate with the second working port P2 or the third working port P3. The second working port P2 is connected to the first driving gas inlet C1, and the third working port P3 is connected to the second driving gas inlet C2.

[0086] The drive piston is movably disposed inside the housing, and is at least partially sealed to the inside of the housing. The drive piston is located between the first drive port D1 and the second drive port D2. Drive gas enters the housing through the first drive port D1 or the second drive port D2, creating a pressure difference between the two ends of the drive piston, which drives it to move between the first drive port D1 and the second drive port D2, so that the first working port P1 communicates with the second working port P2 or the third working port P3, thereby supplying drive gas to the second cavity 315 or the fourth cavity 317, realizing the repeated movement of the first piston 312 and the second piston 313 inside the outer shell 311.

[0087] For example, in practical applications, the driving gas enters the housing through the first driving port D1 to drive the driving piston to move from the first driving port D1 to the second driving port D2, so that the first working port P1 and the second working port P2 are connected, allowing the driving gas to enter the second cavity 315, and driving the second piston 313 to move to compress the first cavity 314. At the same time, the volume of the first cavity 314 increases, enabling the detection gas to be drawn into the first cavity 314 from the first inlet A1. When the second piston 313 moves to its end and collides, triggering the second limit switch 34, the driving gas enters the housing through the second driving port D2 to drive the driving piston to move from the second driving port D2 to the first driving port D1, so that the first working port P1 and the third working port P3 are connected. The driving gas is then input into the fourth cavity 317 through the second driving gas inlet C2 to drive the first piston 312 to move and compress the first cavity 314, thereby compressing the detection gas in the first cavity 314. When the detection gas in the first cavity 314 is pressurized to a pressure greater than the first preset pressure, the second one-way valve 36 opens. At the same time, the volume of the third cavity 316 increases, and the detection gas is drawn into the third cavity 316 through the first outlet B1 and the second inlet A2. When the end of the first piston 312 moves to the point of collision, triggering the first limit switch 33, the driving gas enters the housing through the first driving port D1 and is input into the second cavity 315 through the first driving gas inlet C1. This drives the second piston 313 to move and compress the third cavity 316, thereby compressing the detection gas in the third cavity 316. When the detection gas in the third cavity 316 is pressurized to a pressure greater than the second preset pressure, the fourth one-way valve 38 opens. At the same time, the volume of the first cavity 314 increases, and the detection gas is drawn into the first cavity 314 through the first inlet A1. The above steps are repeated to achieve continuous pressurization of the detection gas.

[0088] In this embodiment, the outlet of the pressurization unit 3 is connected to an outlet pipe 51, which is used for detachable connection with the hydrogen system 300 and for conveying the detection gas. Specifically, the outlet pipe 51 is connected to the second outlet B2. Specifically, when it is necessary to convey pressurized detection gas to the hydrogen system 300, the outlet pipe 51 can be connected to the hydrogen system 300. After pressurization is completed, the outlet pipe 51 can be detached from the hydrogen system 300. That is, the above design can ensure that the pressurization unit 3 is only connected to the hydrogen system 300 during the pressurization process, avoiding unnecessary occupation of the pressurization unit 3.

[0089] Optionally, the outlet pipe 51 is provided with a shut-off valve 52 for controlling its on / off state. The shut-off valve 52 can be a manually controlled valve.

[0090] A cooler 53 is also provided on the gas outlet pipe 51. The cooler 53 is used to reduce the temperature of the detection gas in the gas outlet pipe 51, so as to prevent the temperature of the detection gas from rising continuously after pressurization, which would affect the subsequent airtightness detection effect.

[0091] For example, the cooler 53 may include a housing and cooling pipes. The housing is hollow inside and has a first opening, a second opening, a third opening, and a fourth opening communicating with its interior. The first opening is for communication with an external coolant source, allowing coolant from the external coolant source to enter the housing through its inlet end. The second opening is for communication with the outside, allowing coolant to flow out to the outside. The cooling pipes are located inside the housing. The inlet end of the cooling pipe communicates with the third opening, and the outlet end of the cooling pipe communicates with the fourth opening. The exhaust pipe 51 includes a first pipe section and a second pipe section. The first pipe section connects the second outlet B2 of the booster unit and the inlet end of the cooling pipe, and the inlet end of the second pipe section communicates with the outlet end of the cooling pipe, allowing the detection gas to flow through the cooling pipes. The temperature of the coolant is lower than that of the detection gas. The detection gas can contact the coolant inside the housing through the cooling pipes, allowing the coolant inside the housing to exchange heat with the detection gas in the cooling pipes, absorbing heat from the detection gas and lowering its temperature.

[0092] The coolant can be water or other substances, and the temperature of the coolant can be set according to actual needs, without any restrictions.

[0093] A pressure gauge 54 is installed on the air outlet pipe 51. The pressure gauge 54 is used to detect the pressure signal inside the air outlet pipe 51.

[0094] A pressure relief pipe 55 is connected to the gas outlet pipe 51. The pressure relief pipe 55 is used to release the test gas to the outside to avoid excessive pressure in the booster device 100 and improve the safety of use.

[0095] A pressure relief valve 56 is installed on the pressure relief line 55. The pressure relief valve 56 is communicatively connected to the pressure gauge 54. The pressure relief valve 56 is used to control the opening and closing of the pressure relief line 55 according to the pressure signal from the pressure gauge 54, to prevent the pressurization equipment 100 from being over-pressurized, thereby protecting the pipeline and ensuring operational safety. Alternatively, the pressure relief valve 56 can also be manually controlled according to the pressure signal from the pressure gauge 54.

[0096] The outlet pipe 51 and the pressure relief pipe 55 are connected via the discharge pipe 57. The connection point between the discharge pipe 57 and the outlet pipe 51 is located downstream of the pressure gauge 54, and the connection point between the discharge pipe 57 and the pressure relief pipe 55 is located downstream of the pressure relief valve 56. The discharge pipe 57 is equipped with an unloading valve 58 for controlling its on / off state. The unloading valve 58 is a manually controlled valve, allowing for manual operation to release high-pressure gas from the outlet pipe 51, ensuring pipeline and operational safety.

[0097] In this embodiment, the detection device 200 is set independently of the pressurization device 100, allowing the detection device 200 to operate independently of the pressurization device 100. For example, even if the pressurization device 100 is separated from the hydrogen system 300 to be tested, the detection device 200 can still operate normally without being affected by the pressurization device 100. The detection device 200 includes multiple independent detection units 6, each of which can be individually connected to a hydrogen system 300 to be tested for detecting the airtightness of the corresponding hydrogen system 300.

[0098] In this design, the pressurizing device 100 and the detection device 200 are set up independently, allowing them to operate independently. Since the pressurizing unit 3 of the pressurizing device 100 is detachably connected to the hydrogen system 300 to be tested, in practical applications, the pressurizing unit 3 can be connected to the hydrogen system 300 to deliver pressurized detection gas into it. After pressurization is complete, the pressurizing device 100 can be detached from the pressurized hydrogen system 300 to facilitate its connection to the next hydrogen system 300 to deliver pressurized detection gas. Meanwhile, since the multiple detection units 6 of the detection device 200 are independent of each other and can function independently, in practical applications, each detection unit 6 can be set up to correspond to a hydrogen system 300 to be tested. This allows the hydrogen system 300 to be tested to be tested to be tested to perform air tightness signal detection through one detection unit 6 of the detection device 200 after the detection gas filling of one hydrogen system 300 is completed. The above operation is repeated until the detection gas filling of all hydrogen systems 300 to be tested is completed in sequence. This is beneficial to enable all hydrogen systems 300 to be tested to be tested to perform air tightness detection simultaneously.

[0099] In other words, the above design enables a single pressurizing device 100 to sequentially deliver detection gas to multiple hydrogen systems 300, and a single detection device 200 to simultaneously detect the airtightness signals of multiple hydrogen systems 300. By parallelizing the detection gas filling operation and airtightness detection operation of multiple hydrogen systems 300, the waiting time in the entire detection process can be reduced, detection efficiency can be improved, and production costs can be reduced.

[0100] Each detection unit 6 is used to communicate with the high-pressure sensor 310 and low-pressure sensor 320 of the hydrogen system 300, and can receive the real-time high-pressure signal and real-time low-pressure signal of the hydrogen system 300.

[0101] The detection unit 6 is also connected to the temperature detector of the hydrogen system 300 and can receive the real-time temperature signal of the hydrogen system 300.

[0102] In some embodiments, the detection device 200 further includes multiple temperature detectors, each detection unit 6 being communicatively connected to a temperature detector, which is used to detect the real-time temperature signal of the hydrogen system 300.

[0103] The detection unit 6 is used to obtain a first airtightness signal based on the initial high-pressure signal and initial temperature signal received at the start of the preset time and the real-time high-pressure signal and real-time temperature signal received at the end of the preset time, and to obtain a second airtightness signal based on the initial low-pressure signal and initial temperature signal received at the start of the preset time and the real-time low-pressure signal and real-time temperature signal received at the end of the preset time.

[0104] For example, after the detection gas filling of the hydrogen system 300 is completed and cooled for a certain period of time, the real-time high-pressure signal detected by the high-pressure sensor 310 is the initial high-pressure signal P. 高0 The real-time temperature signal detected by temperature sensor 330 / temperature detector is the initial temperature signal T0, and the real-time low-pressure signal detected by low-pressure sensor 320 is the initial low-pressure signal P. 低0 After the hydrogen system 300 has maintained pressure for a preset time, the high-pressure sensor 310 detects the real-time high-pressure signal P. 高1 The temperature sensor 330 / temperature detector detects the real-time temperature signal, which is the initial temperature signal T1. The low-pressure sensor 320 detects the real-time low-pressure signal P. 低1 Among them, since the volume V and the amount of substance n remain constant, the pressure is directly proportional to the temperature: P 高0 / T0=P 高1 / T1, that is, P 高0 '=P 高1 ×(T0 / T1), based on this, P can be... 高1 Converted to the pressure value P corresponding to the initial temperature signal T0. 高0 Similarly, P can be considered... 低1 Converted to the pressure value P corresponding to the initial temperature signal T0. 低0 After conversion, calculate P respectively. 高0 'with P 高1 The difference, P 低0 'with P 低0 If the absolute value of the difference between the two is less than 0.5 MPa, the airtightness test of the hydrogen system 300 is qualified; if the absolute value of the difference between either one is greater than 0.5 MPa, the airtightness test of the hydrogen system 300 is unqualified.

[0105] Since the pressurized hydrogen system 300 needs a certain cooling time, when there are multiple hydrogen systems 300 to be tested, the detection units 6 corresponding to the hydrogen systems 300 that have completed pressurization can be activated sequentially according to the order in which they have completed cooling. Alternatively, all detection units 6 can be activated simultaneously after all the pressurized hydrogen systems 300 have completed cooling. The specific choice depends on the needs and is not limited here.

[0106] In this embodiment, the detection unit 6 can also convert the real-time high-pressure signal, real-time low-pressure signal, real-time temperature signal, first airtightness signal and second airtightness signal from electrical signals into digital quantities to realize signal visualization.

[0107] The detection unit 6 is composed of a PLC (Programmable Logic Controller) module.

[0108] The detection device 200 also includes an alarm, which is communicatively connected to each detection unit 6. The alarm is used to issue different alarm signals based on the first airtightness signal or the second airtightness signal of each detection unit 6.

[0109] For example, the alarm includes multiple alarm units, each of which is communicatively connected to a detection unit 6 and is used to issue different alarm signals according to the first airtightness signal or the second airtightness signal of the corresponding detection unit 6. This design facilitates a more intuitive discovery of the detection results of each hydrogen system 300 to be tested.

[0110] Each alarm unit is equipped with four alarm signals, which respectively indicate that the first airtightness signal is qualified, the first airtightness signal is unqualified, the second airtightness signal is qualified, and the second airtightness signal is unqualified. This allows for a more intuitive display of the problems in each hydrogen system 300 to be tested, facilitating subsequent processing based on the signals and simplifying the operation.

[0111] The detection equipment 200 also includes a digital platform 7, which is communicatively connected to multiple detection units 6. The digital platform 7 receives signals from the multiple detection units 6 and analyzes and processes the received signals to integrate real-time signals within a preset time period, and monitors the high-pressure, low-pressure, and temperature data within the hydrogen system 300 under test in real time. The signals emitted by the detection units 6 include visualized real-time digital data of high pressure, low pressure, and temperature after processing by the detection units 6.

[0112] The testing equipment 200 also includes a display 8, which is communicatively connected to the digital platform 7 to display visualized real-time airtightness signals. The display 8, in conjunction with the digital platform 7 and multiple testing units 6, employs digital online testing technology. This facilitates data recording, processing, and autonomous judgment of airtightness test results, enabling real-time monitoring of the hydrogen system 300 under test, reducing manual calculation workload and time. Simultaneously, it transmits the testing process and results to the display 8, making the test information more visual and intuitive, enabling more timely detection and handling of problems during testing, traceability of test results, more reliable quality control, reduced production costs, and increased production efficiency.

[0113] In this embodiment, the digital platform 7 can be a MES manufacturing management system.

[0114] As can be seen from the above technical solution, this utility model has at least the following advantages and positive effects:

[0115] In this application, the pressurizing device and the detection device of the detection apparatus are set up independently, allowing them to operate independently. Since the pressurizing unit of the pressurizing device is detachably connected to the hydrogen system to be tested, in practical applications, the pressurizing unit can be connected to the hydrogen system to deliver pressurized detection gas into it. After pressurization is complete, the pressurizing device can be detached from the pressurized hydrogen system to facilitate connection to the next hydrogen system to be tested for pressurized detection gas delivery. Simultaneously, since the multiple detection units of the detection apparatus are independent and can operate independently, in practical applications, each detection unit can be set up corresponding to one hydrogen system to be tested and detect the airtightness of its corresponding system. This allows for airtightness signal detection of one hydrogen system after it has been filled with detection gas, through one detection unit of the detection apparatus. This operation is repeated until all hydrogen systems to be tested have been filled with detection gas, and all systems are simultaneously tested for airtightness.

[0116] In other words, the above design enables a single pressurization device to deliver detection gas to multiple hydrogen systems, and a single detection device to simultaneously detect the airtightness signals of multiple hydrogen systems. By parallelizing the detection gas filling and airtightness detection operations of multiple hydrogen systems, the waiting time in the entire detection process can be reduced, thereby improving detection efficiency and reducing production costs.

[0117] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A detection device for detecting the airtightness of a hydrogen system, characterized in that, The detection device includes: A pressurization device includes a gas storage unit, a drive unit, and a pressurization unit. The gas storage unit and the drive unit are connected in parallel to the pressurization unit. The gas storage unit stores detection gas. The pressurization unit is connected to the gas storage unit and / or an external detection gas source to receive and pressurize the detection gas from the gas storage unit and / or the external detection gas source. The drive unit drives the pressurization unit. The pressurization unit is detachably connected to a hydrogen system to be tested and is used to deliver pressurized detection gas into the hydrogen system to be tested. The detection device is set up independently of the pressurization device. The detection device includes multiple independent detection units, each of which can be individually connected to a hydrogen system to be tested for detecting the airtightness of the hydrogen system to be tested.

2. The detection device according to claim 1, characterized in that, Each of the aforementioned detection units is used to communicate with the high-pressure sensor and the low-pressure sensor of the hydrogen system. The high-pressure sensor is used to detect the real-time high-pressure signal of the hydrogen system, and the low-pressure sensor is used to detect the real-time low-pressure signal of the hydrogen system. The detection unit is also communicatively connected to the temperature sensor of the hydrogen system, or the detection device further includes multiple temperature detectors, each of the detection units being communicatively connected to the temperature sensor or one of the temperature detectors, the temperature sensor or the temperature detector being used to detect the real-time temperature signal of the hydrogen system; The detection unit is used to obtain a first airtightness signal based on the initial high-pressure signal and initial temperature signal received at the start of the preset time and the real-time high-pressure signal and real-time temperature signal received at the end of the preset time, and to obtain a second airtightness signal based on the initial low-pressure signal and initial temperature signal received at the start of the preset time and the real-time low-pressure signal and real-time temperature signal received at the end of the preset time.

3. The detection device according to claim 2, characterized in that, The detection device also includes an alarm, which is communicatively connected to each of the detection units. The alarm is used to issue different alarm signals based on a first airtightness signal or a second airtightness signal from each of the detection units. The detection equipment also includes a digital platform, which is communicatively connected to multiple detection units and is used to receive and analyze signals from the multiple detection units. The detection device also includes a display, which is communicatively connected to the digital platform and used to display visualized real-time airtightness data.

4. The detection device according to claim 1, characterized in that, The gas storage unit is connected to the pressurization unit, or the gas storage unit and the external detection gas source are both connected to the pressurization unit; The gas storage unit is connected to the inlet of the booster unit via a gas supply pipeline; the booster unit is connected to an external detection gas source via an air intake pipeline, and the air intake pipeline is equipped with a valve for controlling its on / off state.

5. The detection device according to claim 4, characterized in that, The booster unit includes a booster pump and a reversing valve. The inlet of the booster pump is connected to the air intake pipeline and the air supply pipeline, and the outlet of the booster pump is connected to the hydrogen system. The reversing valve is connected to the drive unit and the booster pump. The reversing valve is used to control the on / off connection between the booster pump and the drive unit. The reversing valve is a two-position four-way valve.

6. The detection device according to claim 5, characterized in that, The intake pipe is connected in parallel with the supply pipe and is connected to the inlet of the booster pump through the main gas transmission pipe; The main gas pipeline is equipped with a first filter, which is located downstream of the gas inlet pipeline and the gas supply pipeline. The first filter is used to filter the detection gas. The gas main is equipped with a first regulating valve, which is located downstream of the first filter. The first regulating valve is used to adjust the opening of the gas main.

7. The detection device according to claim 6, characterized in that, The main gas pipeline is also equipped with two pressure detection devices, which are located at the inlet and outlet ends of the first regulating valve, respectively, to detect the pressure signal in the main gas pipeline. The main gas pipeline is also equipped with a switch valve for controlling its on / off state, and the switch valve is located downstream of the first regulating valve.

8. The detection device according to claim 5, characterized in that, The drive unit includes a second filter, which is connected to an external drive gas source and is connected to the reversing valve via a connecting pipe. The second filter is used to filter the drive gas. The drive unit further includes a second regulating valve and a pneumatic switch connected in parallel downstream of the second filter. The second regulating valve is located on the connecting pipeline and is used to regulate the opening of the connecting pipeline. The pneumatic switch is connected between the second filter and the reversing valve through a pneumatic pipeline and is used to control the on / off state of the pneumatic pipeline. A pressure detector is provided downstream of the second regulating valve. The pressure detector is communicatively connected to the second regulating valve and is used to detect the pressure signal at the outlet of the second regulating valve. A safety valve is also provided downstream of the second regulating valve. The safety valve is communicatively connected to the pressure detector and is used to relieve pressure on the drive unit.

9. The detection device according to claim 1, characterized in that, The outlet of the pressurization unit is connected to a gas outlet pipeline, which is used for detachable connection with the hydrogen system and for conveying detection gas; the gas outlet pipeline is equipped with a shut-off valve for controlling its on / off state. A cooler is also provided on the outlet pipe, which is used to reduce the temperature of the detection gas in the outlet pipe.

10. The detection device according to claim 9, characterized in that, A pressure gauge is installed on the air outlet pipe, and the pressure gauge is used to detect the pressure signal inside the air outlet pipe. The gas outlet pipe is connected to a pressure relief pipe, which is used to discharge the detection gas to the outside. The pressure relief pipeline is equipped with a pressure relief valve, which is communicatively connected to the pressure gauge. The pressure relief valve is used to control the opening and closing of the pressure relief pipeline according to the pressure signal from the pressure gauge. The outlet pipe and the pressure relief pipe are connected through a discharge pipe. The connection point between the discharge pipe and the outlet pipe is located downstream of the pressure gauge, and the connection point between the discharge pipe and the pressure relief pipe is located downstream of the pressure relief valve. The discharge pipe is equipped with an unloading valve for controlling its on / off state.

Images