Air tightness detection device, leakage limit value calibration method, leakage limit value verification method and air tightness detection method
By using a low-pressure airtightness testing device and judging the amount of gas leakage, the problem of low detection efficiency and high cost in existing technologies has been solved. This achieves non-destructive, pollution-free, and efficient waterproof performance testing, which is applicable to a variety of equipment and meets mass production needs.
Patent Information
- Application Number
- CN202512006923.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2025-12-08
- Filing Date
- 2025-12-29
- Publication Date
- 2026-02-13
AI Technical Summary
Existing technologies cannot efficiently and non-destructively test the waterproof performance of electronic devices, especially those with IPX6 and below. This results in low testing efficiency, high costs, and a high rate of product scrap. Furthermore, high-pressure airtightness tests cannot accurately determine the waterproof rating.
It adopts a low-pressure (5-10Kpa) airtightness testing device, and performs airtightness testing on the equipment through a fluid regulation unit and a detection unit. The waterproof level is determined by combining the gas leakage amount. It is suitable for testing different equipment and has a simple structure and is easy to operate.
It enables non-destructive, pollution-free, and efficient testing of equipment waterproofing performance, reducing production costs and product scrap rates. The test results are accurate, applicable to a wide range of fields, and suitable for mass production needs.
Smart Images
Figure CN121521387A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of airtightness testing technology, specifically to an airtightness testing device, a leakage limit calibration method, a leakage limit verification method, and an airtightness testing method. Background Technology
[0002] Waterproof performance testing, a crucial step in ensuring product quality, is widely used across various industries, particularly in the electronics sector. Every electronic device requiring waterproofing must undergo this core process before leaving the factory to ensure proper functioning in specific water environments and prevent malfunctions or damage due to substandard waterproofing. Currently, the industry standard for evaluating waterproof performance is the IPXX waterproof rating, with IPX6 and below covering waterproofing requirements in various everyday and special scenarios, from splashing to high-pressure water jets. This standard serves as an important reference for the waterproof design and testing of electronic equipment.
[0003] Traditional IPXX waterproof testing methods, such as splash tests and spray tests, have the following problems: Directly testing each device is extremely inefficient, making it difficult to meet the demands of large-scale production. Furthermore, the direct contact between the device and water during testing makes it susceptible to damage to internal components due to weak seals or water pressure impacts, resulting in a high product scrap rate. This significantly increases production costs and severely restricts the improvement of production efficiency, failing to adapt to the efficient and low-cost production pace of modern electronics manufacturing.
[0004] Meanwhile, the commonly used high-pressure airtightness testing method (greater than 100 kPa) cannot meet the requirements for testing waterproof performance of IPX6 and below. Traditional high-pressure airtightness testing mainly aims to detect whether a product has leaks, and can only give a pass or fail result, which is costly. However, waterproof seals of IPX6 and below are not absolute seals; according to their rating standards, a certain degree of leakage (i.e., a certain amount of gas leakage) is allowed. Existing technology cannot accurately determine the waterproof performance level of a product through airtightness testing, nor can it quantify the correspondence between leakage volume and various waterproof ratings of IPX6 and below. This results in significant functional limitations of high-pressure airtightness testing in this type of waterproof rating testing scenario. Summary of the Invention
[0005] The purpose of this invention is to provide an airtightness testing device that uses a low-pressure testing method to achieve non-destructive, pollution-free, efficient, and fast testing of equipment, thereby reducing testing costs.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: An airtightness testing device includes an air source and a testing pipeline connected to the air source. The testing pipeline is connected to a testing element, which is used to connect to the device under test. The testing pipeline is equipped with a fluid regulating unit, a fluid detection unit, and a valve switch. The fluid regulating unit is used to regulate the testing operating pressure at the connection between the testing element and the device under test to 5-10 kPa. The fluid detection unit is used to detect the parameters of the testing pipeline.
[0007] In the above technical solution, the testing pressure is adjusted to a low pressure of 5-10 kPa using a fluid regulating unit. This method of testing the airtightness of the equipment under low pressure overcomes the shortcomings of the traditional IPXX waterproof testing method. It eliminates the need for the equipment to directly contact water, reducing the risk of damage due to water ingress, improving testing efficiency, and lowering product scrap rate and production costs. At the same time, it also overcomes the shortcomings of the current high-pressure airtightness testing method, reducing testing costs. This technical solution can determine the waterproof rating of the equipment based on the test results.
[0008] The test piece can be flexibly adjusted according to the air inlet of the device under test. When testing different devices, the test piece can be changed to adapt to the testing of various devices, making it widely applicable.
[0009] When testing the device under test, the pressure and flow rate of the air source are adjusted to the preset value through the fluid regulating unit; the valve switch is closed, the test piece is connected to the device under test, the valve switch is opened, and the pressure and flow rate changes are detected through the fluid detection unit to determine whether the device under test meets the corresponding IPXX waterproof rating.
[0010] The overall device has a simple structure, is easy to operate, requires no complicated tooling, has low operating costs, and is suitable for the rapid testing needs of production lines, enabling efficient determination of the waterproof performance level of the tested equipment.
[0011] As a preferred option, the air source is an air tank containing compressed air.
[0012] Preferably, the fluid detection unit includes a micro-pressure regulating valve, and / or a pressure gauge, and / or a gas flow meter, and / or a gas flow regulating valve installed on the detection pipeline.
[0013] Preferably, the testing component includes a pressure plate with an inner cavity, a testing pipeline connected to the pressure plate and communicating with the inner cavity of the pressure plate, and the pressure plate has an air outlet communicating with the inner cavity.
[0014] Preferably, the pressure plate is detachably fixed to the device under test, and the air outlet is directly opposite the air inlet of the device under test.
[0015] Preferably, a sealing ring is fixed on the side of the pressure plate where the air outlet is located, and the sealing ring is located on the outside of the air outlet.
[0016] The beneficial effects of this invention are as follows: 1. This solution adopts a low-pressure (5-10 kPa pressure) testing method, which can be used to test equipment that has certain requirements for airtightness and waterproof performance but does not need to be completely sealed, and obtain the waterproof rating based on the test results.
[0017] 2. Air molecules (such as N2 and O2) are much smaller than water molecules (H2O) and have a much lower viscosity. If the gas leakage of the equipment is small, then the water seepage will be less. Therefore, the conclusion of the waterproof rating obtained by this method is more accurate.
[0018] 3. Parameters such as gas leakage can be displayed very accurately and quickly, which is far more sensitive and efficient than observing tiny water leaks. Therefore, this solution is more measurable and accurate than the results obtained from traditional waterproofing tests.
[0019] 4. This device is a low-pressure test (5-10 kPa). Under low pressure, it can be used for waterproof testing of IPX6 and below. Compared with high-pressure airtightness testing, this test can achieve non-destructive, pollution-free, efficient and fast testing of the tested equipment.
[0020] 5. By changing the test pieces, different devices can be tested, making it widely applicable.
[0021] 6. The overall device has a simple structure, is easy to operate, and has a low cost.
[0022] Another object of the present invention is to provide a method for calibrating leakage limits, comprising the following steps: IPXX waterproof testing was conducted on multiple similar sample devices one by one, and sample devices with qualified waterproof test results were selected. The airtightness testing device described above was used to test the airtightness of each sample device that passed the waterproof test. Based on the results of the airtightness test, the maximum gas leakage value is extracted. After repeated testing, the average of the maximum gas leakage values is calculated, and this average value is determined as the leakage limit corresponding to the IPXX waterproof rating.
[0023] Another object of the present invention is to provide a leakage limit verification method, characterized by comprising the following steps: The aforementioned airtightness testing device was used to conduct airtightness tests on multiple similar sample devices that had not undergone IPXX waterproof testing, and sample devices with gas leakage ≤ leakage limit were selected. IPXX waterproof test was performed on sample equipment that met the leakage limits to verify the effectiveness of the leakage limits. If the verification results show that the leakage limit corresponds to the IPXX waterproof rating, then the leakage limit will be included in the airtightness test standard; if the verification results do not correspond, then the sample equipment will be prepared again, the sealing structure of the sample equipment will be adjusted, and the leakage limit calibration will be performed again according to the aforementioned leakage limit calibration method to achieve an equivalent IPXX waterproof rating.
[0024] Another object of the present invention is to provide an airtightness testing method, comprising the following steps: The aforementioned airtightness testing device was used to perform airtightness testing on the equipment under test; The waterproof rating of the tested equipment is determined by the leakage limit value included in the aforementioned airtightness test and inspection standard, and the gas leakage of the tested equipment is compared with the leakage limit value. If the gas leakage of the tested equipment is less than or equal to the leakage limit, the tested equipment is deemed to meet the corresponding IPXX waterproof rating requirements; if the gas leakage of the tested equipment is greater than the leakage limit, the tested equipment is deemed not to meet the corresponding IPXX waterproof rating requirements.
[0025] Preferably, the IPXX waterproof rating includes IPX4, IPX5, and IPX6. Under a test pressure of 5±0.1 kPa and a gas flow rate of 5±0.1 L / min, the test time is 30 seconds. The corresponding leakage limits included in the inspection standards are: IPX4 ≤ 1.5 L / min, IPX5 ≤ 0.7 L / min, and IPX6 ≤ 0.3 L / min. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 A schematic diagram illustrating the status of the device under test. Figure 3 This is the air circuit diagram for the airtightness testing device.
[0027] Figure 4 A flowchart of the leakage limit calibration method; Figure 5 A flowchart of the leakage limit verification method; Figure 6 This is a flowchart of the airtightness testing method.
[0028] Among them, 11. Test piece, 12. Gas tank, 13. Pressure gauge, 14. Valve switch, 15. Gas flow meter, 16. Gas flow regulating valve, 17. Micro pressure regulating valve, 20. Test pipeline, 21. Test equipment. Detailed Implementation
[0029] The present invention will now be described in further detail with reference to the accompanying drawings.
[0030] like Figure 1-3 An airtightness testing device is used in the production process to replace the traditional IPXX waterproof performance testing. It can achieve non-destructive testing of the waterproof performance of the device under test 21. It includes an air source and a testing pipeline 20 connected to the air source. The testing pipeline 20 is connected to a testing element 11, which is used to connect the device under test 21. The testing pipeline 20 is equipped with a fluid regulating unit, a fluid detection unit, and a valve switch 14. The fluid regulating unit is used to regulate the testing working pressure at the connection between the testing element 11 and the device under test 21 to 5-10 kPa. The fluid detection unit is used to detect the parameters of the testing pipeline 20.
[0031] In the above technical solution, the testing pressure is adjusted to a low pressure of 5-10 kPa using a fluid regulating unit. By conducting airtightness testing on the equipment under low pressure, it is possible to test equipment that has certain requirements for airtightness and waterproof performance but does not need to be completely sealed. This overcomes the shortcomings of the current traditional IPXX waterproof testing method, eliminates the need for direct contact between the equipment and water, reduces the risk of equipment damage due to water ingress, improves testing efficiency, and reduces product scrap rate and production costs during the production process. At the same time, it can also overcome the shortcomings of the current high-pressure airtightness testing method and reduce testing costs. This technical solution can obtain the waterproof rating of the equipment based on the test results.
[0032] The test piece 11 can be flexibly adjusted according to the air inlet of the device under test 21. When testing different devices under test 21, the test piece 11 can be replaced to adapt to the testing of various devices, and it has a wide range of applications.
[0033] When testing the device under test 21, the pressure and flow rate of the air source are adjusted to the preset value through the fluid regulating unit; the valve switch 14 is closed, the test piece 11 is connected to the device under test 21, the valve switch 14 is opened, and the pressure and flow rate changes are detected through the fluid detection unit to determine whether the device under test 21 has reached the corresponding IPXX waterproof rating.
[0034] The overall device has a simple structure, is easy to operate, requires no complicated tooling, has low operating costs, and is suitable for the rapid testing needs of production lines. It can efficiently determine the waterproof performance level of the tested equipment.
[0035] It should be noted that, in this embodiment, the device under test 21 can be a controller for an implantable ventricular assist device (hereinafter referred to as an artificial heart), which has an IPX4 waterproof performance requirement. Of course, this device can be used to test any device or container with an IPX3-IPX6 waterproof requirement.
[0036] During implementation, the air source is an air storage tank 12 containing compressed air.
[0037] In the above technical solution, closing valve switch 14 sends compressed air into air storage tank 12. Specifically, an air compressor can be started to store compressed air in air storage tank 12 for buffering.
[0038] In implementation, the fluid detection unit includes a micro-pressure regulating valve 17 installed on the detection pipeline 20. The pressure regulation range of the micro-pressure regulating valve 17 is 0-10 kPa. The model of the micro-pressure regulating valve is RY-LOK 10 kPa.
[0039] In the above technical solution, after the gas pressure of the gas source stabilizes, the micro-pressure regulating valve 17 is adjusted to control the test pressure. In this embodiment, the test pressure is adjusted to 5 kPa ± 0.1 kPa.
[0040] In practice, the fluid detection unit includes a gas flow regulating valve 16 installed on the detection pipeline 20. The gas flow regulating valve is model ASC100-06.
[0041] In the above technical solution, after opening valve switch 14, the gas flow regulating valve 16 can be adjusted to control the gas flow rate. In this embodiment, during testing, the gas flow rate is controlled at 5L ± 0.1L / min.
[0042] In practice, the fluid detection unit includes a pressure gauge 13 installed on the detection pipeline 20. The pressure detection range of the pressure gauge 13 is 0-10 kPa. The model of the pressure gauge is MIK-Y290.
[0043] In practice, the fluid detection unit includes a gas flow meter 15 installed on the detection line 20. The gas flow meter is model AMS2106R05.
[0044] In practice, the testing component 11 includes a pressure plate with an inner cavity, the testing pipeline 20 is connected to the pressure plate and communicates with the inner cavity of the pressure plate, and the pressure plate has an air outlet that communicates with the inner cavity.
[0045] During implementation, the pressure plate is detachably and fixedly connected to the device under test 21, with the air outlet facing the air inlet of the device under test 21. The connection between the pressure plate and the device under test 21 can be secured with screws.
[0046] It should be noted that the testing component 11 can also take the form of a quick connector, and is not limited to the structure of a pressure plate. The testing component 11 is configured to match the air inlet interface of the device under test 21.
[0047] During implementation, a sealing ring is fixed to the side of the pressure plate with the air outlet, and the sealing ring is located on the outside of the air outlet. The sealing ring ensures a good seal.
[0048] The principle of this technical solution is as follows: Close valve switch 14 and introduce compressed air into the air storage pipe. After the air pressure in the air storage tank 12 stabilizes, adjust the micro-pressure regulating valve 17 to the preset value (5±0.1Kpa); open valve switch 14 and adjust the gas flow regulating valve 16 to the preset value (5±0.1L / min); close valve switch 14 and connect the test piece 11 to the device under test 21; open valve switch 14 and determine whether the device under test 21 can achieve the corresponding IPXX waterproof performance based on the values of pressure gauge 13 and gas flow meter 15 (judgment conditions are shown in Table 1).
[0049] It should be further noted that the system also includes a controller, which can be a PLC from existing technology; its structure and principle will not be elaborated in this embodiment. The micro-pressure regulating valve 17, gas flow regulating valve 16, pressure gauge 13, and gas flow meter 15 in this solution are all connected to this controller. When the valve switch 14 is a solenoid valve, it is connected to this controller. Of course, the valve switch 14 can also be a manual valve.
[0050] like Figure 4 As shown, the present invention also provides a method for calibrating leakage limits, comprising the following steps: IPXX waterproof testing was conducted on multiple similar sample devices one by one, and sample devices with qualified waterproof test results were selected. The airtightness testing device described above was used to test the airtightness of each sample device that passed the waterproof test. Based on the results of the airtightness test, the maximum gas leakage value is extracted. After repeated testing (at least three times), the average of the maximum gas leakage value is calculated and determined as the leakage limit corresponding to the IPXX waterproof rating.
[0051] This leakage limit calibration method first screens sample equipment that has passed the IPXX waterproof test, and then uses an airtightness testing device for targeted testing. The calibrated leakage limit can accurately correspond to the actual requirements of the IPXX waterproof level, providing a scientific and quantitative basis for subsequent airtightness testing to replace traditional waterproof testing. It solves the technical problem that traditional waterproof testing cannot be transformed into an efficient airtightness testing standard, while ensuring the consistency between the threshold and the actual waterproof performance of the product, and avoiding the distortion of test results due to the deviation of the threshold setting.
[0052] like Figure 5 As shown, the present invention also provides a leakage limit verification method, characterized by comprising the following steps: The aforementioned airtightness testing device was used to conduct airtightness tests on multiple similar sample devices that had not undergone IPXX waterproof testing, and sample devices with gas leakage ≤ leakage limit were selected. IPXX waterproof test was performed on sample equipment that met the leakage limits to verify the effectiveness of the leakage limits. If the verification results show that the leakage limit corresponds to the IPXX waterproof rating, then the leakage limit will be included in the airtightness test standard; if the verification results do not correspond, then the sample equipment will be prepared again, the sealing structure of the sample equipment will be adjusted, and the leakage limit calibration will be performed again according to the aforementioned leakage limit calibration method to achieve an equivalent IPXX waterproof rating.
[0053] This leakage limit verification method effectively verifies the validity and accuracy of calibrated leakage limits by screening untested sample equipment through airtightness testing and then verifying the screening results through standard IPXX waterproof testing. This ensures the correlation between airtightness testing compliance and waterproof performance standards. For cases where verification fails, a closed-loop process of adjusting the sealing structure and recalibrating further optimizes the threshold accuracy, ultimately forming an effective threshold that can be directly incorporated into the inspection standard. This provides rigorous standard support for the efficient testing of mass-produced products, while connecting the calibration process with actual testing applications, ensuring the consistency and practicality of the entire technical solution.
[0054] like Figure 6 The present invention also provides an airtightness testing method, comprising the following steps: The aforementioned airtightness testing device was used to perform airtightness testing on the equipment under test; The waterproof rating of the tested equipment is determined by the leakage limit value included in the aforementioned airtightness test and inspection standard, and the gas leakage of the tested equipment is compared with the leakage limit value. If the gas leakage of the tested equipment is less than or equal to the leakage limit, the tested equipment is deemed to meet the corresponding IPXX waterproof rating requirements; if the gas leakage of the tested equipment is greater than the leakage limit, the tested equipment is deemed not to meet the corresponding IPXX waterproof rating requirements.
[0055] This airtightness testing method directly uses proven and effective standardized leakage limits as the judgment basis, combined with the low-pressure testing mode (5-10 kPa) of the airtightness testing device, to achieve non-destructive, efficient, and quantifiable testing of the waterproof performance of the tested equipment. Compared with traditional IPXX waterproof testing, it eliminates the need for equipment contact with water, completely avoiding the risk of equipment damage due to water ingress, significantly improving testing efficiency, reducing product scrap rate and testing costs. Compared with high-pressure airtightness testing, it can accurately match the non-absolute sealing requirements of IPX4-IPX6 levels, and can quickly determine the waterproof level by directly comparing the gas leakage amount with the leakage limit. It is easy to operate, provides intuitive judgment results, and is suitable for the rapid testing needs of mass production scenarios, while ensuring the equivalence of test results with traditional waterproof testing.
[0056] The testing methods include IPXX waterproof testing, a test pressure setting of 5±0.1 kPa, a test gas flow rate setting of 5±0.1 L / min, a test time setting of 30 s, and IPXX gas leakage limits (the following limits apply to specific tested items; slight differences may exist for items with different structures). The equivalent conclusions of IPXX waterproof rating and leakage limits are shown in the table below: The core reason for setting a 30-second detection time is that, in the initial stage of detection, there is a brief period of flow instability in the gas flow at the connection points between the detection pipeline, the detection component, and the device under test (such as airflow impact and pressure fluctuations within the pipeline). The leakage data measured at this time is easily interfered with and cannot reflect the true sealing condition of the device under test. After a 30-second stabilization period, the gas pressure and flow rate within the pipeline reach dynamic equilibrium, and the airflow state tends to stabilize. At this point, the gas leakage data measured by the fluid detection unit can accurately match the actual sealing performance of the device under test, ensuring the reliability and accuracy of the final determined leakage limit, and providing precise data support for subsequent waterproof rating determination. Under low-pressure conditions, the result is judged based on changes in gas leakage. Under precisely controlled pressure and flow conditions, the gas leakage detected by the high-precision leakage instrument directly corresponds to the corresponding IPXX equivalent rating.
[0057] Finally, it should be noted that in the description of this invention, the terms "vertical," "upper," "lower," "horizontal," 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 invention 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 invention.
[0058] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. An airtightness testing device, comprising a gas source and a testing pipeline (20) connected to the gas source, characterized in that, The detection pipeline (20) is connected to the detection element (11), which is used to connect the device under test (21). The detection pipeline (20) is equipped with a fluid regulating unit, a fluid detection unit and a valve switch (14). The fluid regulating unit is used to regulate the detection working pressure at the connection between the detection element (11) and the device under test (21) to 5-10 kPa. The fluid detection unit is used to detect the parameters of the detection pipeline (20).
2. The airtightness testing device according to claim 1, characterized in that, The air source is an air tank (12) containing compressed air.
3. The airtightness testing device according to claim 1 or 2, characterized in that, The fluid detection unit includes a micro-pressure regulating valve (17) installed on the detection line (20), and / or a pressure gauge (13), and / or a gas flow meter (15), and / or a gas flow regulating valve (16).
4. The airtightness testing device according to claim 1 or 2, characterized in that, The testing component (11) includes a pressure plate with an inner cavity, a testing pipeline (20) is connected to the pressure plate and communicates with the inner cavity of the pressure plate, and the pressure plate has an air outlet that communicates with the inner cavity.
5. The airtightness testing device according to claim 4, characterized in that, The pressure plate is detachably fixed to the device under test (21), and the air outlet is directly opposite the air inlet of the device under test (21).
6. The airtightness testing device according to claim 4, characterized in that, A sealing ring is fixed on the side of the pressure plate where the air outlet is located, and the sealing ring is located on the outside of the air outlet.
7. A method for calibrating leakage limits, characterized in that, Includes the following steps: IPXX waterproof testing was conducted on multiple similar sample devices one by one, and sample devices with qualified waterproof test results were selected. The airtightness testing device as described in any one of claims 1 to 6 is used to perform airtightness testing on each sample device that has passed the waterproof test. Based on the results of the airtightness test, the maximum gas leakage value is extracted. After repeated testing, the average of the maximum gas leakage values is calculated, and this average value is determined as the leakage limit corresponding to the IPXX waterproof rating.
8. A method for verifying leakage limits, characterized in that, Includes the following steps: Using the air tightness testing device as described in any one of claims 1 to 6, air tightness testing was performed on multiple similar sample devices that had not undergone IPXX waterproof testing, and sample devices with gas leakage amount ≤ the leakage limit as described in claim 7 were selected. IPXX waterproof test was performed on sample equipment that met the leakage limits to verify the effectiveness of the leakage limits. If the verification results show that the leakage limit corresponds to the IPXX waterproof rating, then the leakage limit will be included in the airtightness test standard; if the verification results do not correspond, then the sample equipment will be prepared again, the sealing structure of the sample equipment will be adjusted, and the leakage limit calibration will be performed again according to the leakage limit calibration method described in claim 7 to calibrate the equivalent IPXX waterproof rating.
9. A method for testing airtightness, characterized in that, Includes the following steps: The airtightness testing device as described in any one of claims 1 to 6 is used to perform airtightness testing on the equipment under test; The waterproof rating of the tested equipment is determined by the leakage limit included in the airtightness test inspection standard according to claim 8, and the gas leakage of the tested equipment is compared with the leakage limit. If the gas leakage of the tested equipment is less than or equal to the leakage limit, the tested equipment is deemed to meet the corresponding IPXX waterproof rating requirements; if the gas leakage of the tested equipment is greater than the leakage limit, the tested equipment is deemed not to meet the corresponding IPXX waterproof rating requirements.
10. The airtightness testing method according to claim 9, characterized in that, IPXX waterproof ratings include IPX4, IPX5, and IPX6. Under a test pressure of 5±0.1 kPa and a gas flow rate of 5±0.1 L / min, with a test time of 30 seconds, the corresponding leakage limits included in the inspection standards are: IPX4 ≤ 1.5 L / min, IPX5 ≤ 0.7 L / min, and IPX6 ≤ 0.3 L / min.