Air tightness testing device

Abstract

The application discloses a kind of air tightness detection device. Air tightness detection device includes gas path component and detection instrument. The gas path component includes first air inlet, at least two product test interfaces and gas path switching unit. The first air inlet is used to connect with detection gas source;The product test interface is used to connect with the product to be measured;The gas path switching unit connects the first air inlet with each product test interface, and the gas path switching unit is configured to selectively communicate one of the product test interfaces with the first air inlet;Detection instrument is connected with the first air inlet, and the detection instrument is used to detect the air tightness of the product to be measured. When one of the product test interfaces is connected to the product to be measured for air tightness detection, the remaining product test interfaces can complete the clamping preparation of other products to be measured, saving the waiting time for clamping to improve the detection efficiency.

Description

Technical Field

[0001] This application relates to the field of airtightness testing technology, and in particular to an airtightness testing device. Background Technology

[0002] With the booming development of new energy vehicles, car pallets need to undergo waterproof sealing tests to prevent malfunctions caused by internal air and water leakage. In related technologies, airtightness testing devices are typically equipped with a single test interface, allowing only one product to be tested at a time. When facing batch testing needs, it is necessary to wait for the previous product to complete all testing procedures and be disassembled before the next product can be clamped and tested, resulting in low overall testing efficiency. Utility Model Content

[0003] This application provides an airtightness detection device that can improve detection efficiency.

[0004] The airtightness testing device provided in this application includes:

[0005] The gas path assembly includes:

[0006] The first air inlet is used to connect to the detection air source;

[0007] At least two product test interfaces, which are used to connect to the product under test; and

[0008] An air path switching unit connects the first air inlet to each of the product test interfaces, and the air path switching unit is configured to selectively connect one of the product test interfaces to the first air inlet; and

[0009] The testing instrument is connected to the first air inlet. When one of the product test interfaces is connected to the first air inlet, the testing instrument is used to test the air tightness of the product under test.

[0010] Optionally, the gas path switching unit includes a gas distribution block, a diaphragm valve assembly, and a solenoid valve manifold;

[0011] The gas distribution block has one inlet and multiple outlets, and the inlet of the gas distribution block is connected to the first air inlet;

[0012] The diaphragm valve assembly includes multiple independent diaphragm valves, the input end of each diaphragm valve is connected to one of the outlets of the gas distribution block, and the output ends of the multiple diaphragm valves are connected to the product test interface one by one.

[0013] The solenoid valve manifold is electrically connected to the diaphragm valve assembly. The solenoid valve manifold is configured to control the opening and closing state of each diaphragm valve to connect the inlet of the gas distribution block to one of the product test interfaces through the corresponding diaphragm valve.

[0014] Optionally, the air circuit assembly includes a second air inlet, the outlet of which is connected to the solenoid valve manifold, and the inlet of which is used to connect to a driving air source. The driving air source is used to drive the solenoid valve manifold to control the opening and closing state of each diaphragm valve.

[0015] Optionally, the air path assembly includes an exhaust port, one end of which is connected to the outside and the other end of which is connected to the air path switching unit; the air path switching unit is further configured to selectively connect the exhaust port to one of the product test interfaces.

[0016] Optionally, the gas path assembly includes a first self-test interface, one end of which is connected to a standard leak hole having a specific leakage value, and the other end of which is connected to the gas path switching unit.

[0017] The gas path switching unit is also configured to selectively connect the first self-test interface to the first air inlet. When the first self-test interface is connected to the first air inlet, the detection instrument is used to detect the leakage value of the standard leak hole.

[0018] Optionally, the gas path assembly includes a second self-test interface, one end of which is connected to a test tank, the volume of which is the same as the volume of the product under test, and the other end of which is connected to the gas path switching unit.

[0019] The air path switching unit is also configured to selectively connect the second self-test interface to the first air inlet. When the second self-test interface is connected to the first air inlet, the testing instrument is used to test the airtightness of the inspection tank.

[0020] Optionally, the airtightness testing device includes at least one test plug for connecting to the test hole of the product under test.

[0021] Optionally, the test plug includes a seal and a bent member movably disposed with the seal. The seal is used to connect to the test hole of the product under test. The bent member is bent relative to the seal to cause the seal to expand under external pressure, thereby sealing the test hole of the product under test.

[0022] Optionally, the airtightness testing device includes a booster pump connected between the testing air source and the first air inlet.

[0023] Optionally, the airtightness testing device includes a housing, in which the air path assembly and the testing instrument are housed, and rollers are provided below the housing.

[0024] The airtightness testing device provided in this application embodiment enables collaborative operation of alternating clamping and testing at two workstations by setting at least two product testing interfaces. When one product testing interface is connected to the product under test for airtightness testing, the operator can complete the clamping preparation of other products under test at the other idle product testing interfaces. After the previous product is tested, the air path can be quickly switched through the air path switching unit to start the testing process of the next product, without waiting for clamping time, thereby improving testing efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the air tightness testing device provided in the embodiments of this application.

[0027] Figure 2 This is another schematic diagram of the airtightness detection device provided in the embodiments of this application.

[0028] Figure 3 This is a schematic diagram of the gas path assembly provided in an embodiment of this application.

[0029] Explanation of icon numbers:

[0030] Air tightness testing device 100, air path assembly 10, first air inlet 11, product test interface 12, exhaust port 13, air path switching unit 14, air distribution block 141, diaphragm valve assembly 142, diaphragm valve 1421, solenoid valve manifold 143, second air inlet 15, first self-test interface 16, second self-test interface 17, testing instrument 20, test plug 30, booster pump 40, housing 50, roller 51.

[0031] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0033] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0034] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0035] It should be understood that the term "and / or" as used in this application specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0036] 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 that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0037] Please see Figures 1-3 The airtightness testing device 100 includes an air path assembly 10 and a testing instrument 20. The air path assembly 10 includes a first air inlet 11, at least two product test interfaces 12, and an air path switching unit 14. The first air inlet 11 is used to connect to a test air source. The product test interfaces 12 are used to connect to the product under test. The air path switching unit 14 connects the first air inlet 11 to the product test interfaces 12, and is configured to selectively connect one of the product test interfaces 12 to the first air inlet 11. The testing instrument 20 is connected to the first air inlet 11 and is used to test the airtightness of the product under test.

[0038] The gas path assembly 10 is used for gas transmission, switching, and emission, while the testing instrument 20 is responsible for acquiring airtightness test data. The first air inlet 11 can adopt an industrial standard quick-connect coupling structure to quickly achieve a sealed connection with external compressed air. The input end of the gas path switching unit 14 is fixedly connected to the first air inlet 11 via a high-pressure resistant air pipe, and the output end is connected to at least two product test interfaces 12 respectively.

[0039] Different testing air sources can be selected depending on the specific testing requirements. For example, when testing industrial products such as automotive pallets that do not have special requirements for the medium, the testing air source is usually compressed air from the factory, which is inexpensive and readily available. When the product being tested is sensitive to humidity, the testing air source can be switched to dry compressed air to prevent the testing process itself from contaminating or oxidizing the product.

[0040] To improve testing efficiency, the gas path assembly 10 is equipped with at least two product test interfaces 12. These product test interfaces 12 can also be designed as quick connectors or similar forms to facilitate the installation of the products under test. In one operating mode of the airtightness testing device 100 provided in this application, the operator can pre-install all products under test onto the corresponding product test interfaces 12, and then, by controlling the gas path switching unit 14, perform individual testing on each product sequentially. This avoids the inefficiency caused by frequent product disassembly and reassembly. The number of product test interfaces 12 can be two, three, four, or five, etc., and is not limited here; the appropriate number of product test interfaces 12 can be set according to actual needs.

[0041] The core function of the gas path switching unit 14 is to switch the gas path channels in a controlled manner, selectively connecting the first air inlet 11 to one of the product test interfaces 12, so that the gas from the test gas source can flow into the product under test corresponding to the product test interface 12.

[0042] The air path switching unit 14 can be a multi-port rotary valve. The valve body has multiple ports, corresponding to the first air inlet 11 and various product test ports 12. The valve core has specific flow channels machined inside. By manually or by motor-driven rotation of the valve core, its internal flow channels can be aligned with different port combinations, thereby achieving air path switching.

[0043] When the gas path switching unit 14 connects the first air inlet 11 to a product test interface 12, the testing instrument 20 begins to operate. Its testing principle is typically based on the pressure decay method or the differential pressure method. Taking the pressure decay method as an example, the testing instrument 20 contains a high-precision pressure sensor. After inflating the product under test to reach the predetermined test pressure, the testing gas source is shut off, and the pressure drop is monitored within a set pressure holding time. If the product has a leak, the pressure will continue to drop; if the drop exceeds the predetermined standard, it is considered unqualified.

[0044] The airtightness testing device 100 provided in this application embodiment enables a collaborative operation mode of alternating clamping and testing at two workstations by setting at least two product testing interfaces 12. When one product testing interface 12 is connected to the product under test for airtightness testing, the operator can complete the clamping preparation of the other products under test at the other idle product testing interfaces 12. After the previous product is tested, the air path can be quickly switched through the air path switching unit 14 to start the testing process of the next product, without waiting for clamping time, thereby improving testing efficiency.

[0045] Please see Figure 3 Optionally, the gas path switching unit 14 includes a gas distribution block 141, a diaphragm valve assembly 142, and a solenoid valve manifold 143. The gas distribution block 141 has one inlet and multiple outlets, and the inlet of the gas distribution block 141 is connected to the first air inlet 11. The diaphragm valve assembly 142 includes multiple independent diaphragm valves 1421, the input end of each diaphragm valve 1421 is connected to one of the outlets of the gas distribution block 141, and the output ends of the multiple diaphragm valves 1421 are connected to each of the product test interfaces 12. The solenoid valve manifold 143 is electrically connected to the diaphragm valve assembly 142, and the solenoid valve manifold 143 is configured to control the opening and closing state of each diaphragm valve 1421 to connect the inlet of the gas distribution block 141 to one of the product test interfaces 12 through the corresponding diaphragm valve 1421.

[0046] Thus, the gas distribution block 141, the diaphragm valve assembly 142, and the solenoid valve manifold 143 work together to achieve precise switching and on / off control of each channel, adapting to the high-pressure gas transmission and stable control requirements of the airtightness test of the product under test.

[0047] The inlet of the gas distributor 141 can be sealed to the outlet of the first air inlet 11 via a threaded connection or a quick connector to prevent leakage of the detection gas source during transmission. Multiple outlets of the gas distributor 141 can be evenly distributed on one or more sides of the gas distributor 141, and each outlet can be configured with a standard threaded interface to facilitate connection with the subsequent diaphragm valve assembly 142.

[0048] The number of diaphragm valves 1421 in the diaphragm valve assembly 142 matches the number of outlets of the gas distribution block 141 and the number of gas paths that need to be switched. The input end of each diaphragm valve 1421 is connected to one outlet of the gas distribution block 141 through a pipe or other structure to achieve a one-to-one sealed connection. The output ends of multiple diaphragm valves 1421 are respectively connected to at least two product test interfaces 12 to achieve a one-to-one sealed connection. The one-to-one connection method ensures the independence and sealing of each gas path in the gas path assembly 10, avoiding mutual interference between different gas paths.

[0049] The solenoid valve manifold 143 is used to control the opening and closing of the diaphragm valve 1421. It integrates an equal number of solenoid directional valves as the diaphragm valve 1421. Each solenoid directional valve is electrically connected to an external controller to receive control commands.

[0050] When the controller issues a command to switch the gas path to a specific product test interface 12, the corresponding solenoid directional valve will be energized, thereby opening the diaphragm valve 1421. This allows the gas at the inlet of the gas distribution block 141 to flow to the preset interface through the diaphragm valve 1421, while the other diaphragm valves 1421 remain closed. In this way, the solenoid valve manifold 143 is configured to accurately control the opening and closing state of each diaphragm valve 1421, thereby selectively connecting the inlet of the gas distribution block 141 to any one of the product test interfaces 12 through the corresponding diaphragm valve 1421.

[0051] In one embodiment, the gas distribution block 141 has two outlets. Correspondingly, the diaphragm valve assembly 142 includes two independent diaphragm valves 1421, each corresponding to one of the two product test interfaces 12 on the gas path assembly 10. It is understood that, depending on actual testing requirements, the number of outlets in the gas distribution block 141 and the number of diaphragm valves 1421 in the diaphragm valve assembly 142 can be flexibly increased or decreased, for example, four, five, or even more, to accommodate more testing stations or other functional expansions.

[0052] Optionally, the pneumatic assembly 10 includes a second air inlet 15, the outlet of which is connected to the solenoid valve manifold 143, and the inlet of the second air inlet 15 is used to connect to a driving air source, which is used to drive the solenoid valve manifold 143 to control the opening and closing state of each diaphragm valve 1421.

[0053] The second air inlet 15 provides an independent driving air source for the solenoid valve manifold 143, ensuring that the solenoid valve manifold 143 can accurately control the opening and closing state of each diaphragm valve 1421, thereby achieving efficient switching of the entire air circuit system.

[0054] The inlet of the second air inlet 15 can be designed with a standard quick connector or threaded connector for easy and quick connection with the testing air source equipment. The outlet of the second air inlet 15 can be sealed and connected to the testing air source input interface on the solenoid valve manifold 143 through the pipe body.

[0055] The driving air source can be compressed air, which enters the solenoid valve manifold 143 through the second air inlet 15 and is then distributed to the air inlets of each solenoid directional valve inside the solenoid valve manifold 143. When the solenoid valve manifold 143 receives an electrical signal from the controller that a specific diaphragm valve 1421 needs to be opened, the corresponding solenoid directional valve will be energized and guide the compressed air from the driving air source to the pneumatic control port of the diaphragm valve 1421. The pneumatic control port is used to receive the driving signal.

[0056] Under the pressure of the driving gas source, the valve core or diaphragm of the diaphragm valve 1421 displaces, thereby opening the valve and allowing the detection gas from the first inlet 11 to flow through the diaphragm valve 1421 to a preset interface, such as any product test interface 12. The second inlet 15 is independently located from the first inlet 11 and is specifically designed for connecting to the driving gas source. This prevents fluctuations in the pressure of the detection gas source from affecting the driving gas source, and vice versa.

[0057] Optionally, the air path assembly 10 includes an exhaust port 13, one end of which communicates with the outside and the other end of which is connected to the air path switching unit 14. The air path switching unit 14 is also configured to selectively connect the exhaust port 13 to one of the product test interfaces 12.

[0058] After the airtightness test of the product is completed or when the work station is switched, the gas path switching unit 14 connects the exhaust port 13 to the product test interface 12 corresponding to the product, so that the gas remaining inside the product to be tested after the test is completed, as well as the residual gas in the gas path component 10 corresponding to the connected gas path, can be discharged through the exhaust port 13, preventing the gas containing water vapor in the product to be tested from entering the testing instrument 20 and causing damage to the testing instrument 20.

[0059] Please see Figure 3 Optionally, the gas path assembly 10 includes a first self-test interface 16, one end of which is connected to a standard leak hole with a specific leakage value, and the other end of which is connected to the gas path switching unit 14.

[0060] The gas path switching unit 14 is also configured to selectively connect the first self-test interface 16 to the first air inlet 11. When the first self-test interface 16 is connected to the first air inlet 11, the detection instrument 20 is used to detect the leakage value of the standard leak hole.

[0061] Thus, based on the measurement results of the 20 standard leak holes by the testing instrument, the accuracy of the entire airtightness testing device 100 can be effectively verified.

[0062] A standard leak is a component with a known leakage rate that has been calibrated and can serve as a benchmark for measuring the sensitivity and accuracy of a detection system.

[0063] When the airtightness testing device 100 needs to be calibrated periodically, the gas path switching unit 14 connects the first air inlet 11 with the first self-test interface 16, allowing the test gas source to flow into the standard leak hole. The testing instrument 20 then monitors the pressure change or specific gas concentration inside the standard leak hole and calculates the leakage value of the standard leak hole. The leakage value measured by the testing instrument 20 is then compared with the known leakage value marked on the standard leak hole.

[0064] If the difference between the two values ​​is consistent within the allowable error range, it proves that the measurement results of the airtightness testing device 100 are reliable. If there is a significant deviation, it indicates that the airtightness testing device 100 may be drifting or malfunctioning, and needs to be calibrated or repaired in a timely manner.

[0065] Please see Figure 3 Optionally, the gas path assembly 10 includes a second self-test interface 17, one end of which is connected to the test tank, the volume of which is the same as the volume of the product to be tested, and the other end of which is connected to the gas path switching unit 14.

[0066] The air path switching unit 14 is also configured to selectively connect the second self-test interface 17 to the first air inlet 11. When the second self-test interface 17 is connected to the first air inlet 11, the testing instrument 20 is used to test the air tightness of the inspection tank.

[0067] Thus, based on the measurement results of the 20 test tanks, the repeatability and stability of the entire airtightness testing device 100 can be effectively verified.

[0068] The test tank is a well-sealed standard container with a calibrated internal volume identical to that of the product being tested. During routine inspections, such as before each shift, the operator can activate this function to perform a complete airtightness test on the test tank using the airtightness testing device 100. Since the volume of the test tank is known and constant, the test value should theoretically show zero leakage or a very small and stable leakage value.

[0069] The repeatability and stability of the entire airtightness testing device 100 can be effectively verified based on the measurement results of the testing instrument 20 on the inspection tank. If the test results of the inspection tank remain consistently within the acceptable range, it proves that the entire airtightness testing device 100 is in good condition. If the results fluctuate significantly or exceed the tolerance, it indicates that the airtightness testing device 100 may have problems such as gas leakage or drift of the testing instrument 20.

[0070] By combining the first self-test interface 16 and the second self-test interface 17, the reliability and comparability of the test results of the airtightness testing device 100 are greatly enhanced.

[0071] Please see Figure 1 Optionally, the airtightness testing device 100 includes at least one test plug 30, which is used to connect to the test hole of the product under test. The test plug 30 is used to quickly and sealingly connect to the pre-drilled test hole on the product under test during testing, forming a sealed cavity inside the product under test that communicates only with the testing gas path. Once the test plug 30 is in place, the product test interface 12 connects to the corresponding interface on the test plug 30, thereby connecting the testing gas path to the sealed cavity of the product under test.

[0072] Optionally, the test plug 30 includes a seal and a bent member movably disposed with the seal. The seal is used to access the test hole of the product under test, and the bent member is bent relative to the seal to cause the seal to expand under external pressure, thereby sealing the test hole of the product under test.

[0073] This sealing method has high sealing reliability and can effectively avoid inaccurate test results caused by product test hole size tolerance or slight wear.

[0074] Specifically, the seal is typically made of an elastic material, such as rubber or silicone. After aligning the seal and inserting it into the test hole, a bending action is performed relative to the seal by bending or rotating a bending element. The mechanical force generated by the bending is transmitted and acts on the seal, causing it to expand outward in the radial direction of the test hole, thereby tightly fitting the inner wall of the test hole and forming a reliable seal inside the cavity of the product under test.

[0075] Please see Figure 2 Optionally, the airtightness testing device 100 includes a booster pump 40, which is connected between the test gas source and the first air inlet 11. When the test pressure required by the product under test is higher than the pressure that the existing test gas source can provide, the booster pump 40 can compress the existing test gas source to the high pressure level required for testing, and then output it to the subsequent gas circuit assembly 10, thereby improving the versatility and application range of the airtightness testing device 100.

[0076] For example, the air pressure of the factory air source is usually 600 kPa. The booster pump 40 can increase the pressure of the factory air source so that the gas pressure entering the first air inlet 11 can reach up to 2000 kPa. This allows the air tightness testing device 100 to cover the range of inflation test pressures from atmospheric pressure to 2000 kPa, thus broadening the applicable scenarios of the air tightness testing device 100.

[0077] Optionally, the airtightness testing device 100 includes an industrial computer, which is electrically connected to the air path switching unit 14 and the testing instrument 20. The industrial computer is used to send control signals to the air path switching unit 14 to selectively connect one of the product test interfaces 12 to the first air inlet 11, and to receive the test data from the testing instrument 20.

[0078] The industrial control computer can send precise control signals to the air path switching unit 14, enabling the air path switching unit 14 to selectively connect the first air inlet 11 to a specific product test interface 12, thereby realizing automatic switching of the testing station. At the same time, the industrial control computer can receive and process test data from the testing instrument 20, such as pressure decay value or leakage rate, and automatically determine whether the product's airtightness is qualified according to preset pass / fail criteria, thereby improving the automation of the airtightness testing device 100.

[0079] Please see Figure 1 Optionally, the airtightness testing device 100 includes a housing 50, an air circuit assembly 10 and a testing instrument 20, all housed within the housing 50, and a roller 51 is provided below the housing 50.

[0080] The housing 50 provides physical protection for the internal air circuit components 10 and testing instruments 20, preventing them from being affected by on-site dust, oil, and accidental impacts. To further enhance the flexibility of the airtightness testing device 100, casters 51 are provided at the bottom of the housing 50. This allows operators to easily move the entire airtightness testing device 100 to different workstations or production lines, greatly improving the utilization rate of the airtightness testing device 100, especially suitable for scenarios where the product to be tested is difficult to move. For example, because a car pallet integrates a large number of parts and is heavy, it cannot be moved to the airtightness testing device 100 for testing.

[0081] Understandably, a handle 52 may also be provided on the housing 50 for handling. A brake may also be provided on the housing 50 to stop the airtightness detection device 100 in a preset position.

[0082] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. An airtightness testing device, characterized in that, include: The gas path assembly includes: The first air inlet is used to connect to the detection air source; At least two product test interfaces, which are used to connect to the product under test; and An air path switching unit connects the first air inlet to each of the product test interfaces, and the air path switching unit is configured to selectively connect one of the product test interfaces to the first air inlet; and A testing instrument is connected to the first air inlet, and the testing instrument is used to test the airtightness of the product under test.

2. The airtightness testing device according to claim 1, characterized in that, The gas path switching unit includes a gas distribution block, a diaphragm valve assembly, and a solenoid valve manifold. The gas distribution block has one inlet and multiple outlets, and the inlet of the gas distribution block is connected to the first air inlet; The diaphragm valve assembly includes multiple independent diaphragm valves, the input end of each diaphragm valve is connected to one of the outlets of the gas distribution block, and the output ends of the multiple diaphragm valves are connected to the product test interface one by one. The solenoid valve manifold is electrically connected to the diaphragm valve assembly. The solenoid valve manifold is configured to control the opening and closing state of each diaphragm valve to connect the inlet of the gas distribution block to one of the product test interfaces through the corresponding diaphragm valve.

3. The airtightness testing device according to claim 2, characterized in that, The pneumatic assembly includes a second air inlet, the outlet of which is connected to the solenoid valve manifold, and the inlet of which is used to connect to a driving air source. The driving air source is used to drive the solenoid valve manifold to control the opening and closing state of each diaphragm valve.

4. The airtightness testing device according to claim 1, characterized in that, The air path assembly includes an exhaust port, one end of which is connected to the outside and the other end of which is connected to the air path switching unit; the air path switching unit is also configured to selectively connect the exhaust port to one of the product test interfaces.

5. The airtightness testing device according to claim 1, characterized in that, The gas path assembly includes a first self-test interface, one end of which is connected to a standard leak hole with a specific leakage value, and the other end of which is connected to the gas path switching unit. The gas path switching unit is also configured to selectively connect the first self-test interface to the first air inlet. When the first self-test interface is connected to the first air inlet, the detection instrument is used to detect the leakage value of the standard leak hole.

6. The airtightness testing device according to claim 1, characterized in that, The gas path assembly includes a second self-test interface, one end of which is connected to a test tank, the volume of which is the same as the volume of the product to be tested, and the other end of which is connected to the gas path switching unit. The air path switching unit is also configured to selectively connect the second self-test interface to the first air inlet. When the second self-test interface is connected to the first air inlet, the testing instrument is used to test the airtightness of the inspection tank.

7. The airtightness testing device according to any one of claims 1-6, characterized in that, The airtightness testing device includes at least one test plug, which is used to connect to the test hole of the product under test.

8. The airtightness testing device according to claim 7, characterized in that, The test plug includes a seal and a bent member movably disposed with the seal. The seal is used to connect to the test hole of the product under test. The bent member is bent relative to the seal to cause the seal to expand under external pressure, thereby sealing the test hole of the product under test.

9. The airtightness testing device according to any one of claims 1-6, characterized in that, The airtightness testing device includes a booster pump, which is connected between the testing air source and the first air inlet.

10. The airtightness testing device according to any one of claims 1-6, characterized in that, The airtightness testing device includes a housing, in which the air path assembly and the testing instrument are housed, and rollers are provided below the housing.

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