Air tightness experiment device for detecting tiny leakage under multiple factors

Abstract

The invention discloses an air tightness experiment device for detecting tiny leakage under multiple factors. The device comprises a gas storage module, an experiment body module, a liquid soap dip-coating module, a data acquisition module, a dual-camera three-dimensional reconstruction module and a leakage point sealing module. The gas storage module comprises a gas compressor and a pressure stabilizing container. The liquid soap dip-coating module comprises a hose, a guide rail and a liquid soap container. And the data acquisition module comprises a pressure sensor for detecting the internal pressure of the pressure stabilizing container. The camera three-dimensional reconstruction module comprises a first industrial camera and a second industrial camera. According to the invention, stainless steel metal plates are welded to form the cubic experiment body, and the leakage holes with different diameters and different shapes are formed in the surface and the weld joints of the experiment body, so that different air leakage scenes of a metal shell structure can be simulated, and the growth conditions of soap bubbles with different leakage holes can be studied; therefore, the relationship between the shape and size of the hollow leak hole and the growth of the soap bubble can be obtained, and the accuracy of detecting the leakage condition according to the soap bubble method is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of nondestructive testing of industrial equipment, and specifically relates to an airtightness experimental device for detecting micro-leakage under multiple factors; Background Art

[0002] The industry related to sealed containers has become one of the pillar industries of national production. Currently, welding is generally used to connect metals. If the welding technology is not good, it is very easy to cause cracks in the weld during use, resulting in tiny leaks on the surface of the container, reducing the airtightness of the sealed container. Gas leakage can cause serious consequences such as fire and equipment explosion. Therefore, a series of airtightness tests must be carried out on gas storage containers and pneumatic equipment before leaving the factory.

[0003] With the improvement of detection requirements, electron probe method, spectroscopy method, ultrasonic method, tracer gas detection method, infrared thermal imaging method and fast algorithms realized by machine learning have emerged. Among them, algorithms using machine learning include neural network method and support vector machine algorithm. Although they have high sensitivity, the complexity of machine learning and deep learning algorithms makes calculation more difficult, and complex models need to be established, so their practicality is general. The remaining methods have the problem of high cost and certain limitations in large-scale investment.

[0004] At present, the most commonly used traditional air tightness detection methods can be divided into two categories: water detection method and soap bubble method. In enterprises, manual detection is usually used to use these two types of detection methods. The soap bubble method is to apply a certain concentration of soap liquid on the surface of the object to be tested. Since the leak point will continue to leak gas, a gradually larger soap bubble will be formed at the leak point, so that the leak point can be determined. The soap bubble method is safe, economical, and simple, and is a commonly used air tightness detection method in enterprises. Due to the existence of tiny leaks in reality, it is of great significance to study tiny leaks of different pore sizes, shapes, and surface styles. At the same time, due to different pressures and soap liquid thicknesses, the inclination of the plane where the leak point is located, etc., they have a significant impact on the generation and growth process of soap bubbles. These mechanism studies have important academic and application value for air tightness detection. Summary of the invention

[0005] The purpose of the present invention is to provide an airtightness experimental device for detecting micro leakage under multiple factors.

[0006] In a first aspect, the present invention provides an airtightness experimental device for detecting micro-leakage under multiple factors, which includes a gas storage module, an experimental body module, a soap solution dipping module, a data acquisition module, a dual-camera three-dimensional reconstruction module and a leak point sealing module. The gas storage module includes a gas compressor and a pressure-stabilizing container. The gas compressor is used to deliver gas to the pressure-stabilizing container so that the pressure-stabilizing container reaches a preset pressure.

[0007] The experimental body module includes an experimental body. The experimental body adopts a hollow metal shell structure and is provided with an air supply pipe. The experimental body is provided with a plurality of leakage holes of different sizes, shapes, and positions.

[0008] The soap solution dipping module includes a hose, a guide rail and a soap solution container. The guide rail is used to provide guidance for the experimental body, so that the experimental body can switch between a state of being immersed in the soap solution container and a state of being separated from the soap solution container. The air supply pipe of the experimental body is connected to the pressure-stabilizing container through a hose and a third shut-off valve. The leakage point sealing module is used to seal the leakage holes at any position, so that only the observed leakage holes on the experimental body can leak.

[0009] The data acquisition module includes a pressure sensor for detecting the internal pressure of the pressure-stabilizing container. The dual-camera three-dimensional reconstruction module includes a first industrial camera and a second industrial camera. The first industrial camera and the second industrial camera are respectively arranged directly above and above the experimental body, and the lenses are facing the experimental body. The angle between the first industrial camera and the second industrial camera is 10° to 75°. During the working process, the first industrial camera and the second industrial camera collect images of the experimental body and the soap bubbles generated by air leakage; by reconstructing the obtained images in three dimensions, a three-dimensional model of the soap bubbles at different times is obtained.

[0010] Preferably, the pressure-stabilizing container comprises a gas storage tank, a micro pressure gauge connected to the gas storage tank via a first stop valve, a fine-tuning stop valve and an exhaust valve connected to the gas storage tank. A second stop valve is provided between the gas storage tank and the pressure sensor.

[0011] Preferably, the experiment body module further includes a digital level, which is used to detect the posture of the experiment body.

[0012] Preferably, a plurality of first leakage holes with different diameters arranged in sequence are opened on one of the flat surfaces of the experimental body; a plurality of second leakage holes with the same cross-sectional area but different shapes arranged in sequence are opened on one of the flat surfaces of the experimental body; a plurality of third leakage holes with different diameters arranged in sequence are opened on one of the welds of the experimental body; Preferably, the test body is formed by welding six rectangular metal plates and an air supply pipe. Each third leak hole is arranged on a weld at a connection between two adjacent rectangular metal plates.

[0013] Preferably, the first leakage hole and the third leakage hole are both circular.

[0014] Preferably, a pressure reducing valve and a pressure gauge are provided between the gas compressor and the pressure stabilizing container.

[0015] Preferably, the pressure sensor is connected to a computer system via a data acquisition device. The first industrial camera and the second industrial camera transmit the captured videos to the computer system for processing.

[0016] Preferably, the leakage point sealing module adopts a sealing block. A sealing ring is provided on the sealing block. The sealing block and the outer surface of the experimental body are connected by a detachable fastening structure; the sealing ring on the sealing block surrounds the outer side of the corresponding leakage point.

[0017] In a second aspect, the present invention provides a small leakage simulation detection method, which uses the aforementioned airtightness experimental device; the small leakage simulation detection method comprises the following steps: The method for using the airtightness experimental device for detecting micro-leakage under multiple factors is as follows: Step 1: According to the simulated leakage scenario, select one or more leak holes on the experimental body as target leak holes; seal all leak holes except the target leak holes. Adjust the posture of the experimental body so that the position of the target leak hole relative to the experimental body matches the leak point in the simulated leakage scenario.

[0018] Step 2: The gas compressor charges the pressure-stabilizing container so that the pressure in the pressure-stabilizing container reaches the working pressure of the simulated leakage scenario.

[0019] Step 3: Add soap liquid into the soap liquid container; immerse the test body into the soap liquid container so that a soap liquid layer is formed on the surface where the target leak hole is located.

[0020] Step 4: Open the third stop valve between the pressure-stabilizing container and the experimental body; the data collector detects the pressure change of the pressure-stabilizing container; the first industrial camera and the second industrial camera collect images of the experimental body and the soap bubbles formed on the target leak. Using the two images at different angles, three-dimensional reconstruction is performed to obtain the three-dimensional model of the soap bubbles at different times.

[0021] Step 5: After the soap bubbles are broken, turn off the first industrial camera and the second industrial camera, and release the pressure in the pressure-stabilizing container.

[0022] Preferably, the process of performing three-dimensional reconstruction using the images captured by the first industrial camera and the second industrial camera is as follows: Step (1): calibrate the first industrial camera and the second industrial camera to determine the internal and external parameters of the cameras; Step (2): using the first industrial camera and the second industrial camera to capture images; Step (3): Perform distortion correction on the acquired image using camera intrinsic parameters; Step (4): extract features from the image corrected in step (3); Step (5): Use image matching algorithm to perform image matching; Step (6): Generate a sparse point cloud of the workpiece based on the image features; Step (7): Use the deep learning stereo matching algorithm to perform dense matching, obtain the depth map, generate a Mesh grid, and complete the 3D reconstruction.

[0023] The present invention has the following beneficial effects.

[0024] 1. The present invention uses stainless steel metal plates to weld a cubic experimental body, and provides leakage holes of different diameters and shapes on the surface and welds of the experimental body, so as to simulate different leakage scenarios of the metal shell structure, thereby being able to study the bubble growth of different leakage holes; and furthermore, being able to obtain the relationship between the shape and size of the hollow leakage hole and the bubble growth, thereby improving the accuracy of detecting leakage according to the soap bubble method.

[0025] 2. The present invention uses dual cameras to form a dual-camera system, which can more accurately detect the three-dimensional data of soap bubbles, perform three-dimensional modeling of soap bubbles, and more accurately describe the conditions of the generated soap bubbles, thus preparing for actual operations during on-site operations.

[0026] 3. The present invention can simply and conveniently simulate factors that affect bubble generation and growth, such as different pore sizes, shapes, surface styles, inclinations, and pressures, so that the situation of tiny leaks under multiple factors can be studied. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 It is a three-dimensional schematic diagram of the experimental body in the present invention.

[0029] Figure 3 It is a schematic diagram corresponding to the first metal plate of the experimental body in the present invention.

[0030] Figure 4 This is a schematic diagram corresponding to the third metal plate of the experimental body in the present invention.

[0031] Figure 5 This is a schematic diagram corresponding to the fifth metal plate of the experimental body in the present invention.

[0032] Figure 6 This is a flow chart of dual-camera 3D reconstruction in the present invention. DETAILED DESCRIPTION

[0033] The following content will provide a complete and clear description of the technical solution of the present invention in conjunction with the accompanying drawings. The present invention includes but is not limited to this type of technical solution.

[0034] In the following description, all the nouns related to the orientation and position direction are based on the orientation or position relationship in the attached drawings, and the purpose is only to facilitate the simplified description of this utility patent, rather than to clearly indicate the corresponding device-related positions and specific orientations, such as "upper", "lower", "inside", etc. Moreover, the stainless steel material of the experimental body only represents a material, and other materials such as plastic, metal, ceramic, etc. can be used to replace it.

[0035] like Figure 1 As shown, an airtightness experimental device for detecting tiny leaks under multiple factors includes an air storage module, an experimental body module, a soap solution dipping module, a data acquisition module, a dual-camera three-dimensional reconstruction module, a leak point sealing module and a pipeline connection module.

[0036] The gas storage module includes a gas compressor 1 and a pressure-stabilizing container. The gas compressor 1 is used to provide a high-pressure gas source to produce high-pressure gas of the pressure required for the experiment, and is responsible for creating an internal pressure environment for the experiment body to ensure the basic inspection requirements of leak detection. The pressure-stabilizing container includes a gas storage tank V1, a fine-tuning stop valve 3, a first stop valve 4, a micro-pressure gauge P2, a pressure sensor P3, a second stop valve 5 and an exhaust valve 6. The fine-tuning stop valve 3, the first stop valve 4, the second stop valve 5 and the exhaust valve 6 are all installed on the top of the gas storage tank V1. The fine-tuning stop valve 3 is used to accurately adjust the internal air pressure of the system to meet the experimental requirements during the experiment, and the exhaust valve 6 is used to quickly exhaust and safely end the experiment after the experiment. The micro-pressure gauge P2 is installed above the first stop valve 4; the pressure sensor P3 is installed above the second stop valve 5. The first stop valve 4 and the second stop valve 5 are respectively arranged between the gas storage tank V1 and the micro-pressure gauge P2 and the pressure sensor P3, which are used to throttle and cut off the gas while ensuring air tightness. The micro pressure gauge P2 is used to accurately read the air pressure in the system in real time, and the pressure sensor P3 is used to monitor the air pressure in the system and cooperate with the data acquisition module.

[0037] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the experimental body module includes a digital level S1 and an experimental body 10. The digital level S1 is installed on the top surface of the experimental body 10 to accurately measure the current tilt of the experimental body. The experimental body 10 is a stainless steel cavity workpiece formed by welding six rectangular metal plates and an air supply pipe 10-10.

[0038] The six rectangular metal plates are the first metal plate 10-1, the second metal plate 10-2, the third metal plate 10-3, the fourth metal plate 10-4, the fifth metal plate 10-5 and the sixth metal plate 10-6. The first metal plate 10-1 forms the top surface of the experimental body 10; the sixth metal plate 10-6 forms the bottom surface of the experimental body 10. The second metal plate 10-2, the third metal plate 10-3, the fourth metal plate 10-4 and the fifth metal plate 10-5 form the four side surfaces of the experimental body 10. The air supply pipe 10-10 is connected to the through hole on the third metal plate 10-3 by welding to ensure its air tightness. A sealing rubber ring is installed at the input end of the air supply pipe 10-10, which is connected to the output end of the third air supply pipeline.

[0039] The top surface of the experimental body 10 is provided with a plurality of first leak holes 10-7 of different diameters arranged in sequence at equal intervals by laser; the first leak holes 10-7 are circular; the bottom surface of the experimental body 10 is provided with a plurality of second leak holes 10-8 of the same cross-sectional area and different shapes arranged in sequence at equal intervals by laser; the shapes of the different second leak holes 10-8 include ellipse, triangle, regular hexagon, square and long waist shape. The long waist shape is composed of a rectangle and two semicircles at both ends of the rectangle. Each first leak hole 10-7 and each second leak hole 10-8 are used to simulate the effects of different pore diameters and shapes on the generation of soap bubbles when a small leak occurs.

[0040] A plurality of third leak holes 10-9 of different diameters arranged in sequence and at equal intervals are opened by laser at one of the steel plate welds of the experimental body 10; the third leak hole 10-9 is circular; the first leak hole 10-7 and the third leak hole 10-9 are used together to simulate the influence of different surface patterns on the generation of soap bubbles during small leaks.

[0041] The soap liquid dipping module includes a hose 9, a guide rail 11 and a soap liquid container 14. The soap liquid container 14 contains the soap liquid required for the experiment; the vertical guide rail 11 is fixed on the frame; the experimental body 10 is slidably connected to the guide rail 11 through a slider, so as to drive the experimental body 10 to rise and fall, so that the experimental body can be immersed in the soap liquid container 14, thereby obtaining a soap liquid layer of uniform thickness on the surface of the experimental body 10. The posture of the experimental body 10 can be adjusted. The output end of the third air supply pipeline is connected to the output port of the gas storage tank V1 through a flexible hose with telescopic elasticity, a flexible joint 8, and a third shut-off valve 7.

[0042] The leak point sealing module is used to seal irrelevant leak points during the experiment to ensure the airtightness of the experimental workpiece so that soap bubbles are only generated at the observed leak points.

[0043] In some embodiments, the leak point sealing module uses a waterproof and highly viscous adhesive tape. The adhesive tape is covered on the leak point to be sealed, and can test the pressure generated after the internal pressure of the body 10 is filled. By sticking adhesive tape on different leak points, different experimental requirements can be met.

[0044] In some other embodiments, the leak point sealing module adopts a blocking block. A sealing ring is provided on the blocking block. A detachable fastening structure cooperating with the blocking block is provided on the outer side surface of the experimental body. When the blocking block is against the outer side surface of the experimental body, the sealing ring surrounds the outside of the corresponding leak point to ensure the sealing effect. The detachable fastening structure can adopt a bolt and nut connection structure or a snap connection structure. When using the bolt and nut connection structure, a fixing nut is welded on the experimental body, and a bolt is used to pass through the through hole on the blocking block and connected to the nut.

[0045] The pipeline connection module includes a pressure reducing valve 2, a pressure gauge P1, a third stop valve 7, a flexible joint 8, a first air supply pipeline, a second air supply pipeline, and a third air supply pipeline. The first air supply pipeline, the second air supply pipeline, and the third air supply pipeline are respectively used to connect the gas compressor 1 to the input port of the gas storage tank V1, the gas outlet of the gas storage tank V1 to the flexible joint 8, and the hose 9 to the experimental body 10. The pressure reducing valve 2 and the pressure gauge P1 are arranged on the first air supply pipeline, and are respectively used to adjust the internal air pressure of the system and read the air pressure in the entire device in real time. The third stop valve 7 is arranged on the second air supply pipeline, and is used to throttle and cut off the gas to ensure air tightness. The flexible joint 8 is arranged on the second air supply pipeline. When it is necessary to change the experimental factors such as the inclination of the device and the shooting angle, the connection between the flexible joint and the stop valve can be loosened to rotate the experimental body in the middle.

[0046] The data acquisition module includes a pressure sensor P3, a data acquisition device 12, and a computer system 13. The pressure sensor P3 monitors the air pressure in the system, and the data acquisition device 12 collects data and transmits it to the computer system 13 for analysis of experimental related data on the computer system 12.

[0047] The dual-camera 3D reconstruction module includes a first industrial camera 15, a second industrial camera 16 and a computer system 13. The first industrial camera 15 and the second industrial camera 16 are respectively placed directly above and above the experimental body for shooting; the orientation angle between the first industrial camera 15 and the second industrial camera 16 is between 10° and 75°, and the position can be adjusted as needed, and the views of the soap bubble in two different directions can be obtained at the same time. Since the soap bubble itself is transparent and has few features, the first industrial camera 15 and the second industrial camera 16 will shoot the entire workpiece for 3D reconstruction, and the first industrial camera 15 and the second industrial camera 16 will transmit the shot video to the computer system 13 for processing.

[0048] like Figure 6As shown, the specific steps of dual-camera 3D reconstruction in this embodiment are: Step 1: Calibrate the first industrial camera 15 and the second industrial camera 16 to determine the internal and external parameters of the cameras; Step 2: Use the first industrial camera 15 and the second industrial camera 16 to capture the workpiece image; Step 3: Perform distortion correction on the acquired image using camera intrinsic parameters; Step 4: Use ORB feature detection algorithm to extract features; Step 5: Use the image matching algorithm to match the left and right images, and use the RANSAC algorithm to eliminate false matches; Step 6: Based on the image features, use the sfM algorithm (Structure from Motion) to perform "structure recovery from motion" processing to generate a sparse point cloud of the workpiece; Step 7: Use the deep learning stereo matching algorithm to perform dense matching and obtain the workpiece depth map; Step 8: Generate a Mesh based on the dense point cloud to complete dual-camera 3D reconstruction.

[0049] The method for using the airtightness experimental device for detecting micro-leakage under multiple factors is as follows: Step 1: Select the leak hole required for the experiment from the first leak hole 10-7, the second leak hole 10-8, and the third leak hole 10-9 according to the research needs. Determine the workpiece angle required for the research, adjust the posture of the experimental body 10, and observe the digital level S1 to make the experimental body correspond to the studied situation. According to the experimental needs, adjust the first industrial camera 15 and the second industrial camera 16 to the appropriate position, and use the leak point sealing module to seal the entire experimental body 10.

[0050] Step 2: Open the pressure reducing valve 2 and the third stop valve 7, close all other valves, open the gas compressor 1 to produce high-pressure gas and pass it into the device for 2 seconds, close the gas compressor 1, close the pressure reducing valve 2, and observe whether the micro pressure gauge P2 reading is stable to judge the air tightness of the device. If the micro pressure gauge P2 reading changes too much and cannot be stopped, it means that the air tightness is poor, and it is necessary to recheck the air tightness of the device and repeat steps 1 and 2; if the micro pressure gauge P2 reading is stable, it means that the air tightness is good, open the exhaust valve 6 to release the gas and start the experiment.

[0051] Step 3: Determine the air pressure required for the experiment according to the research needs, open the pressure reducing valve 2, close all other valves, open the gas compressor 1 to produce high-pressure gas, and use the fine-tuning stop valve 3 to finely adjust the air pressure in the device. Observe the micro-pressure gauge P2 until the required air pressure is reached, then close the gas compressor 1, the pressure reducing valve 2, and the fine-tuning stop valve 3. Prepare a soap solution of a certain concentration according to the research needs and place it in the soap solution container 14, remove the leak point sealing module on the leak point required for the experiment, adjust the position of the third air supply pipeline on the guide rail 11 so that the experimental body 10 is lowered and immersed in the soap solution container 14 and lifted up, and obtain a uniform soap solution layer on the surface of the target leak point.

[0052] Step 4: Turn on the computer system 13 to prepare for receiving experimental data, turn on the first industrial camera 15 and the second industrial camera 16 to start collecting experimental images, and turn on the data collector 12 to start collecting air pressure data. Open the third stop valve 7, at this time, the gas in the device will leak from the target leak point and form soap bubbles, the first industrial camera 15 and the second industrial camera 16 will transmit the captured images to the computer system 13, after modeling on the computer system 13, save and record the experimental images and experimental air pressure data on the computer system 13.

[0053] Step 5: After the soap bubbles are broken, turn off the first industrial camera 15, the second industrial camera 16, and the data collector 12, open the exhaust valve 6, and quickly depressurize the container, so that the experiment ends safely and quickly.

[0054] The above contents are further explanations of the present invention by combining specific examples, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art of the present invention, simple deductions or substitutions can be made to a certain extent without departing from the inventive concept, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An airtightness experimental device for detecting micro-leakage under multiple factors, comprising an air storage module, an experimental body module and a soap solution dipping module; characterized in that: It also includes a data acquisition module, a dual-camera three-dimensional reconstruction module and a leak point sealing module; the gas storage module includes a gas compressor (1) and a pressure-stabilizing container; the gas compressor (1) is used to transport gas to the pressure-stabilizing container so that the pressure-stabilizing container reaches a preset pressure; The experimental body module comprises an experimental body (10); the experimental body (10) adopts a hollow metal shell structure and is provided with an air supply pipe (10-10); the experimental body (10) is provided with a plurality of leakage holes of different sizes and / or different shapes and / or different positions; The soap liquid dipping module comprises a hose (9), a guide rail (11) and a soap liquid container (14); the guide rail (11) is used to provide guidance for the experimental body (10), so that the experimental body (10) can switch between a state of being immersed in the soap liquid container (14) and a state of being separated from the soap liquid container (14); the air supply pipe (10-10) of the experimental body (10) is connected to the pressure-stabilizing container through the hose (9) and the third stop valve (7); the leakage point sealing module is used to seal the leakage hole at any position, so that only the leakage hole to be observed on the experimental body (10) can leak; The data acquisition module comprises a pressure sensor (P3) for detecting the internal pressure of the pressure-stabilizing container; the dual-camera three-dimensional reconstruction module comprises a first industrial camera (15) and a second industrial camera (16); the first industrial camera (15) and the second industrial camera (16) are respectively arranged directly above and above the side of the experimental body (10), and the lenses face the experimental body (10); the angle between the first industrial camera (15) and the second industrial camera (16) is 10° to 75°; during operation, the first industrial camera (15) and the second industrial camera (16) collect images of the experimental body (10) and soap bubbles generated by air leakage; and by three-dimensionally reconstructing the obtained images, three-dimensional models of the soap bubbles at different times are obtained.

2. The airtightness test device for detecting micro leakage under multiple factors according to claim 1 is characterized in that: The pressure-stabilizing container comprises a gas storage tank (V1), a micro-pressure gauge (P2) connected to the gas storage tank (V1) via a first stop valve (4), a fine-adjustment stop valve (3) and an exhaust valve (6) connected to the gas storage tank (V1); a second stop valve (5) is provided between the gas storage tank (V1) and the pressure sensor (P3).

3. The airtightness test device for detecting micro leakage under multiple factors according to claim 1 is characterized in that: The experimental body module also includes a digital level (S1); the digital level (S1) is used to detect the posture of the experimental body (10).

4. The airtightness test device for detecting micro leakage under multiple factors according to claim 1 is characterized in that: A plurality of first leakage holes (10-7) with different diameters arranged in sequence are provided on one of the flat surfaces of the experimental body (10); a plurality of second leakage holes (10-8) with the same cross-sectional area but different shapes are arranged in sequence are provided on one of the flat surfaces of the experimental body (10); and a plurality of third leakage holes (10-9) with different diameters are arranged in sequence on one of the weld seams of the experimental body (10).

5. The airtightness test device for detecting micro leakage under multiple factors according to claim 4 is characterized in that: The experimental body (10) is formed by welding six rectangular metal plates and an air supply pipe (10-10); each third leakage hole (10-9) is arranged on a weld at a connection point between two adjacent rectangular metal plates.

6. The airtightness test device for detecting micro leakage under multiple factors according to claim 5 is characterized in that: The first leakage hole (10-7) and the third leakage hole (10-9) are both circular.

7. The airtightness test device for detecting micro leakage under multiple factors according to claim 1 is characterized in that: A pressure reducing valve (2) and a pressure gauge (P1) are provided between the gas compressor (1) and the pressure stabilizing container.

8. The airtightness test device for detecting micro-leakage under multiple factors according to claim 1 is characterized in that: The pressure sensor (P3) is connected to a computer system (13) via a data acquisition device (12); the first industrial camera (15) and the second industrial camera (16) transmit the captured video to the computer system (13) for processing.

9. A method for simulating detection of small leaks, characterized in that: Using the airtightness experimental device for detecting micro-leakage under multiple factors as described in claim 1; the micro-leakage simulation detection method comprises the following steps: The method for using the airtightness experimental device for detecting micro-leakage under multiple factors is as follows: Step 1: selecting one or more leak holes as target leak holes on the experimental body (10) according to the simulated leakage scenario; sealing all leak holes other than the target leak holes; and adjusting the posture of the experimental body (10) so that the position of the target leak hole relative to the experimental body (10) matches the leak point in the simulated leakage scenario; Step 2: The gas compressor (1) charges the pressure stabilizing container so that the pressure in the pressure stabilizing container reaches the working pressure of the simulated leakage scenario; Step 3: Add soap liquid into the soap liquid container (14); immerse the experimental body (10) into the soap liquid container (14) so ​​that a soap liquid layer is formed on the surface where the target leak hole is located; Step 4: Open the third stop valve (7) between the pressure-stabilizing container and the experimental body (10); the data acquisition device (12) detects the pressure change of the pressure-stabilizing container; the first industrial camera (15) and the second industrial camera (16) collect images of the experimental body (10) and the soap bubbles formed on the target leak hole; and perform three-dimensional reconstruction using the two images at different angles to obtain three-dimensional models of the soap bubbles at different times; Step 5: After the soap bubbles are broken, the first industrial camera (15) and the second industrial camera (16) are turned off, and the pressure-stabilizing container is depressurized.

10. A method for simulating detection of small leaks according to claim 9, characterized in that: The process of performing three-dimensional reconstruction using the images captured by the first industrial camera (15) and the second industrial camera (16) is as follows: Step (1): calibrating the first industrial camera (15) and the second industrial camera (16) to determine the internal and external parameters of the cameras; Step (2): using the first industrial camera (15) and the second industrial camera (16) to capture images; Step (3): Perform distortion correction on the acquired image using camera intrinsic parameters; Step (4): extract features from the image corrected in step (3); Step (5): Use image matching algorithm to perform image matching; Step (6): Generate a sparse point cloud of the workpiece based on the image features; Step (7): Use the deep learning stereo matching algorithm to perform dense matching, obtain the depth map, generate a Mesh grid, and complete the 3D reconstruction.

Images