Air tightness detection system

Abstract

The invention relates to an air tightness detection system, which is used for carrying out an air tightness test on air passages in an air passage board, and comprises a distance acquisition module, which is used for acquiring the distance between the air passages; the control module comprises a grouping unit and a judging unit; a distance threshold value is preset in the grouping unit, any two air channels within the distance threshold value are divided into different groups, and any two air channels outside the distance threshold value are divided into the same group; the detection module comprises detection channels of which the number is the same as that of the groups divided by the grouping unit, and each detection channel is correspondingly communicated with one group of air channels; each detection channel is provided with a first air pressure detection device, and the first air pressure detection device is used for detecting the air pressure value of the air channel where the first air pressure detection device is located; the judgment unit is provided with an air pressure threshold value in advance and judges the air tightness of the air channel where the first air pressure detection device is located by comparing the air pressure value detected by the first air pressure detection device with the air pressure threshold value. The air tightness detection system provided by the invention is high in detection efficiency, low in cost and good in reliability.

Description

Technical Field

[0001] The present application relates to the technical field of air tightness detection, and in particular to an air tightness detection system. Background Art

[0002] In rail transit braking systems, brazed air manifolds are typically brazed together from two or three aluminum plates. These plates must be pre-machined to create numerous and complex air passages, and extremely high airtightness requirements are in place. Neither air flow between air passages (internal leakage) nor compressed air can be leaked to the outside through the edges of the mating surfaces or through characteristic holes (such as threaded holes or air holes) (external leakage). Therefore, brazed air manifolds must undergo rigorous airtightness testing before installation.

[0003] When testing the air tightness of the air manifold, if multiple air channels are tested at the same time, multiple large-range, high-precision pressure acquisition devices are required, and the equipment cost is high; if the air channels are tested one by one, the number of air channels on the brazed air manifold is large, and each air channel test takes several minutes, resulting in a long overall test time and low efficiency.

[0004] Therefore, how to overcome the technical contradiction between "high cost of simultaneous detection" and "low efficiency of one-by-one detection" and develop an airtightness detection method that is both efficient and economical has become a key technical problem that needs to be solved urgently.

[0005] Application Contents

[0006] The present application solves at least one of the technical problems in the related art to a certain extent, and provides an airtightness detection system with low detection cost, high efficiency and good reliability.

[0007] To achieve the above objectives, in a first aspect, the present application provides an air tightness detection system for performing air tightness testing on multiple air passages in an air path plate, comprising:

[0008] Distance acquisition module: used to collect the distance between the airways of the airway plate;

[0009] The control module includes a grouping unit and a judgment unit; the grouping unit is connected to the distance acquisition module to obtain the distance between the airways of the airway plate; the grouping unit is preset with a distance threshold and is configured to: divide any two airway plates whose distance is less than or equal to the distance threshold into different groups, and divide any two airway plates whose distance is greater than the distance threshold into the same group;

[0010] The detection module includes an air supply channel and detection channels with the same number of groups as the grouping unit, wherein the air supply channel is connected to each detection channel, and each detection channel is connected to a corresponding group of airways; the air supply channel is used to inflate air into each group of airways; each detection channel is provided with a first air pressure detection device, which is used to detect the air pressure value of the airway after the airway is inflated;

[0011] The judgment unit is connected to the first air pressure detection device to obtain the air pressure value detected by it; the judgment unit is preset with an air pressure threshold, and is configured to: judge the air tightness of the airway where the first air pressure detection device is located by comparing the air pressure value detected by the first air pressure detection device with the air pressure threshold.

[0012] Compared to testing each airway individually, this technical solution's grouped testing method significantly reduces the number of tests and time required, particularly when testing a large number of airways. Furthermore, by combining the testing of each group's airway pressure values ​​with a comparison to the pressure threshold, the airway's tightness can be determined more intuitively and accurately than with bubble detection methods.

[0013] In some embodiments of the present application, the detection module further includes a first switch valve, which is provided in the air supply channel and is used to control the opening and closing of the air supply channel;

[0014] The control module further includes a valve control unit, wherein the valve control unit is connected to the first switch valve to control the on and off of the first switch valve;

[0015] The judgment unit is preset with a first air pressure threshold, a first pressure stabilization time, and a first pressure holding time;

[0016] The control module is configured to:

[0017] When the detection starts, the valve control unit turns on the first switch valve to allow the air supply channel to inflate air into the air channel of the air channel plate; when the judgment unit judges that the air pressure value detected by the first air pressure detection device reaches the first air pressure threshold, the valve control unit turns off the first switch valve to stop the air supply channel from inflating air into the air channel of the air channel plate; when the judgment unit judges that the time length after the air pressure value detected by the first air pressure detection device reaches the first air pressure threshold reaches the first stabilization time length, the judgment unit obtains the stabilization air pressure value of the air channel plate detected by the first air pressure detection device; when the judgment unit judges that the time length after the air pressure value detected by the first air pressure detection device reaches the first air pressure threshold reaches the first pressure holding time length, the judgment unit obtains the holding air pressure value of the air channel plate detected by the first air pressure detection device;

[0018] The judgment unit is preset with a first pressure drop threshold, which is configured to: compare the difference between the stabilizing air pressure value and the maintaining air pressure value with the first pressure drop threshold, and when the difference between the stabilizing air pressure value and the maintaining air pressure value is less than the first pressure drop threshold, judge that the air tightness of the airway where the first air pressure detection device is located is qualified.

[0019] The setting of the pressure stabilization time can ensure that data collection is carried out after the pressure is stable, avoiding the interference of pressure fluctuations on the test results during the inflation process and improving data reliability.

[0020] In some embodiments of the present application, the detection module further includes:

[0021] Exhaust channel: used to discharge the gas in the airway of the gas manifold to the outside atmosphere; it includes an exhaust main channel and an exhaust branch channel. The number of the exhaust branches is the same as the number of the detection channels and they are connected one-to-one. One end of the exhaust main channel is connected to all the exhaust branches, and the other end is connected to the outside atmosphere.

[0022] A second air pressure detection device is provided in the exhaust main path, and is used to detect the air pressure value of the exhaust main path;

[0023] The second on-off valve is provided in the exhaust main path and is used to control the connection and disconnection between the exhaust main path and the outside atmosphere;

[0024] The third switch valve is provided on the exhaust branch to control the connection and disconnection between the exhaust main line and the airway of the airway plate; each exhaust branch is provided with a third switch valve;

[0025] The judgment unit is connected to the second air pressure detection device to obtain the air pressure value detected by it; the valve control unit is connected to the second switch valve and the third switch valve respectively to control the on and off of the second switch valve and the third switch valve;

[0026] The control module is configured to:

[0027] At the start of detection, the valve control unit turns on the first on-off valve and turns off the second on-off valve; when the judgment unit determines that the air pressure value detected by the first air pressure detection device reaches a first air pressure threshold, the valve control unit turns off the first on-off valve; when the judgment unit determines that the time after the air pressure value detected by the first air pressure detection device reaches the first air pressure threshold reaches a first pressure holding time, the judgment unit obtains the first air pressure value of the exhaust channel detected by the second air pressure detection device;

[0028] The judgment unit is preset with a first pressure difference threshold, which is configured to: compare the first air pressure value of the exhaust channel with the first pressure difference threshold, and when the first air pressure value of the exhaust channel is less than the first pressure difference threshold, and the difference between the stabilizing air pressure value and the maintaining air pressure value is less than the first pressure drop threshold, judge that the air tightness of the air channel where the first air pressure detection device is located is qualified.

[0029] Because the pressure difference in the exhaust channel is much smaller than the pressure value after inflation in the detection channel, the detection accuracy is higher, and small pressure changes can also be captured, avoiding the defect of missing micro leaks.

[0030] In some embodiments of the present application, the detection module further includes:

[0031] A fourth switch valve is provided in the detection channel, between the first switch valve and the first air pressure detection device, and is used to control the connection and disconnection between the air supply channel and the detection channel; each detection channel is provided with a fourth switch valve;

[0032] The fifth switch valve: one end is connected to the outside atmosphere, and the other end is connected to the detection channel or the air supply channel between the first switch valve and the third switch valve, and is used to control the connection and disconnection between the detection channel and the air supply channel between the first switch valve and the third switch valve and the outside atmosphere;

[0033] The valve control unit is connected to the fourth switch valve and the fifth switch valve respectively to control the on and off of the fourth switch valve and the fifth switch valve;

[0034] The control module is configured as follows: when starting detection, the valve control unit turns on the fourth switch valve and turns off the fifth switch valve; when the judgment unit determines that the air pressure value detected by the first air pressure detection device reaches the first air pressure threshold, the valve control unit turns off the fourth switch valve and turns on the fifth switch valve.

[0035] The fourth switch valve can independently control the on-off of the air supply channel and each group of air channels; after inflation is completed, opening the fifth switch valve can quickly discharge the residual gas in the air supply channel and the detection channel into the atmosphere, avoiding interference of residual high-pressure gas with subsequent detection.

[0036] In some embodiments of the present application, the grouping unit is configured to: preset a tested group of airways, and select other groups of airways outside the tested group of airways as the test group of airways;

[0037] The judgment unit is preset with a second air pressure threshold, a second pressure stabilization time, and a second pressure holding time;

[0038] The control module is configured to:

[0039] When starting the test, the valve control unit turns on the first switch valve, the second switch valve, the third switch valve in the test channel connected to the airway of the test group, and the fourth switch valve in the test channel connected to the airway of the test group, and turns off the fifth switch valve;

[0040] When the judgment unit determines that the air pressure value of the test group airway detected by the first air pressure detection device reaches the second air pressure threshold, the valve control unit disconnects the first switch valve, the second switch valve, and the fourth switch valve in the detection channel connected to the test group airway, and connects the fifth switch valve;

[0041] The judgment unit obtains the stabilized pressure value of the test group airway detected by the first air pressure detection device when it is judged that the time after the air pressure value of the test group airway detected by the first air pressure detection device reaches the second air pressure threshold reaches the second pressure stabilization time;

[0042] The judgment unit obtains the holding pressure value of the test group airway detected by the first air pressure detection device and the second air pressure value of the exhaust channel detected by the second air pressure detection device when it is determined that the time duration after the air pressure value of the test group airway detected by the first air pressure detection device reaches the second air pressure threshold reaches the second pressure holding time duration;

[0043] The judgment unit is preset with a second pressure drop threshold and a second pressure difference threshold, and is configured to: compare the difference between the stabilizing air pressure value and the pressure maintaining air pressure value with the second pressure drop threshold, compare the difference between the first air pressure value and the second air pressure value of the exhaust channel with the second pressure difference threshold, and judge that the air tightness of the air channel of the tested group is qualified when the difference between the stabilizing air pressure value and the pressure maintaining air pressure value is less than the first pressure drop threshold, and the difference between the first air pressure value and the second air pressure value of the exhaust channel is less than the second pressure difference threshold.

[0044] This technical solution can only determine that the tested group is qualified when both the test group pressure drop is less than the second pressure drop threshold and the exhaust channel pressure difference is less than the second pressure difference threshold. Through the dual judgment criteria, the probability of misjudgment is significantly reduced.

[0045] In some embodiments of the present application, the range of the first air pressure detection device is greater than the range of the second air pressure detection device, and the range of the first air pressure detection device differs from the range of the second air pressure detection device by one order of magnitude.

[0046] At the same accuracy level, the small-range sensor has smaller errors and can capture micro-leaks that large-range sensors cannot detect, thereby improving the accuracy of air tightness testing.

[0047] In some embodiments of the present application, the detection module further includes:

[0048] Gas supply device: connected to the gas supply channel, used to provide compressed gas to the gas supply channel;

[0049] A first pressure reducing valve is provided in the gas supply channel, between the gas supply device and the first switch valve. The compressed gas provided by the gas supply device flows into the detection channel after passing through the first pressure reducing valve.

[0050] The second pressure reducing valve is provided in the exhaust passage, between the third switch valve and the second air pressure detection device. The compressed gas flowing out of the detection passage passes through the second pressure reducing valve and then flows to the second air pressure detection device.

[0051] The pressure reducing valve can stabilize the air pressure in the channel to prevent excessive air pressure from affecting the test results or damaging the air pressure detection device.

[0052] In some embodiments of the present application, a mounting module is further included, wherein the mounting module includes a base, and the gas circuit board is fitted on the base;

[0053] The base is provided with detection air holes that match the air channels in the air path plate, and the base is further provided with detection air channels with the same number as the detection channels, one end of the detection air channel is connected to the detection channel, and the other end is connected to the detection air holes corresponding to the same group of air channels in the air path plate;

[0054] The compressed gas flows from the detection channel through the detection airway and the detection air hole into the airway of the air path plate.

[0055] The detection air holes on the base correspond one-to-one with the air channels on the air path plate, ensuring that the compressed gas only flows into the tested air channel through the preset air path, which can ensure the reliability of air tightness detection.

[0056] In some embodiments of the present application, the mounting module further includes a guide pin and a pressing device, and the guide pin and the pressing device are both mounted on the base;

[0057] The guide pins are used to guide the placement of the air manifold on the base so that the air holes on the air manifold are aligned with the test air holes on the base;

[0058] The pressing device is provided at both ends of the gas circuit board, and is used to fix the gas circuit board on the base by pressing the two ends of the gas circuit board after the gas circuit board is aligned and placed on the base.

[0059] The guide pins engage the positioning holes on the manifold to precisely guide the manifold to the pre-set position on the base, ensuring alignment between the air holes on the manifold and the detection holes on the base. The clamping device applies force evenly across both ends of the manifold, ensuring uniform force between the manifold and the base, preventing localized pressure from causing seal failure.

[0060] In some embodiments of the present application, the installation module further includes a cover plate, which is fitted on the air circuit plate and is used to cover and seal the air holes on the plate surface of the air circuit plate.

[0061] The cover plate covers the air holes on the surface of the gas path plate that are not connected to the detection channel, and cooperates with the base to form a fully enclosed detection space, ensuring the accuracy of the detection.

[0062] The above description is only an overview of the technical solution of the present disclosure. In order to more clearly understand the technical means of the present disclosure, which can be implemented in accordance with the contents of the specification, and to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0064] Figure 1 is a system diagram of an airtightness detection system according to an embodiment of the present application;

[0065] Figure 2 is a schematic structural diagram of a detection module and an installation module according to an embodiment of the present application;

[0066] Figure 3 Schematic diagram of the structure of the airway of the airway plate according to the embodiment of the present application;

[0067] Figure 4 It is a structural schematic diagram of the gas circuit board according to the embodiment of the present application.

[0068] In the above figures: 1. Air circuit board; 2. Air circuit board air duct; 3. Detection channel; 4. Air supply channel; 5. Exhaust channel; 6. First air pressure detection device; 7. Second air pressure detection device; 8. First switch valve; 9. Second switch valve; 10. Third switch valve; 11. Fourth switch valve; 12. Fifth switch valve; 13. Air supply device; 14. First pressure reducing valve; 15. Second pressure reducing valve; 16. Base; 17. Clamping device; 18. Cover plate; 19. Main exhaust path; 20. Branch exhaust path. DETAILED DESCRIPTION

[0069] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0070] In the embodiments of the present application, prefixes such as "first" and "second" are used only to distinguish different description objects and have no limiting effect on the position, order, priority, quantity or content of the described objects. The use of prefixes such as ordinal numbers to distinguish description objects in the embodiments of the present application does not constitute a restriction on the described objects. For the statement of the described objects, please refer to the description in the context of the claims or embodiments, and the use of such prefixes should not constitute an unnecessary restriction. In addition, in the description of this embodiment, unless otherwise specified, the meaning of "plurality" is two or more.

[0071] The following describes the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " represents "or." For example, A / B can represent A or B. "And / or" in this document is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, or B exists alone.

[0072] In the several embodiments provided in the embodiments of the present application, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection of some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0073] In this application, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0074] Brazed air manifolds are widely used in the field of rail transit brake systems. Devices using brazed air manifolds can arrange pneumatic functional components more reasonably, which is conducive to miniaturization and lightweighting of the device.

[0075] Brazed air manifolds for rail vehicles are typically constructed from two to three aluminum plates brazed together. Prior to brazing, the required air ducts are machined into the aluminum plates. These ducts are numerous and complex, requiring high airtightness, and air flow between the ducts is prohibited. Substandard weld coverage at the aluminum plate joints or machining errors can cause leaks in the brazed air manifolds. These leaks can occur internally or externally. Internal leakage occurs when compressed air from one air duct flows into the adjacent duct through the aluminum plate joints. External leakage occurs when compressed air leaks into the atmosphere from the edges of the aluminum plate joints or from characteristic holes (threaded holes, air holes, locating holes, etc.) on the air manifold. Both types of air leakage can seriously impact the normal operation and safety of rail vehicles.

[0076] Therefore, brazed air manifolds must undergo rigorous airtightness testing before being installed on vehicles. Existing testing methods often use pressure drop or bubble methods to measure the airtightness of each airway. The required test pressure is very high. If the pressure drop method is used, the pressure testing equipment must have high accuracy. If multiple airways are measured simultaneously, multiple large-scale, high-precision pressure acquisition devices are required, which are expensive. If the bubble method is used for testing, the tester must concentrate for a long time to observe whether bubbles are generated, and may not be able to detect small leaks, resulting in poor reliability and low efficiency. In addition, the existing testing method connects each airway to a pipeline to measure the airtightness of the airway, which places high demands on the airtightness of the test tool itself. Otherwise, repeated adjustments will be required due to leaks at some joints between the test tool and the airway. In addition, due to the large number of airways on the brazed air manifold, testing each airway one by one results in low testing efficiency. Among them, the document with patent number "CN204556192U" proposes a testing method that can realize the simultaneous measurement of multiple airways, but this method requires the equipment of multiple large-scale high-precision barometers, which is relatively expensive; at the same time, this method cannot measure the problem of cross-wind between airways.

[0077] In order to solve the above problems, this application proposes an airtightness detection system, which collects the distribution of airways to determine the airflow risk of the airways, and then performs airtightness detection on all airways in groups, so that the detection cost of the detection system is low, the efficiency is high, and the reliability is good.

[0078] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0079] As attached Figures 1 to 4 As shown, in an exemplary embodiment of the present application, the air tightness detection system is used to perform air tightness testing on multiple air passages in an air path plate, and includes a distance acquisition module, a control module, and a detection module.

[0080] In some embodiments, the distance acquisition module is used to acquire the distance between the air channels 2 of the airway plate.

[0081] It should be noted that before manufacturing and processing a manifold, a 3D or 2D model of the manifold must be designed first, and the manifold is then manufactured based on the designed model. Therefore, the distance acquisition module collects the distance between airways based on the designed 3D or 2D model.

[0082] In some embodiments, the control module includes a grouping unit and a judgment unit. The control module is the control center of the airtightness test system. In this embodiment, it can be a hardware device such as a controller and a test host, or it can be software such as a program and an algorithm.

[0083] In some embodiments, the grouping unit is connected to the distance acquisition module to obtain the distance between the manifold airways 2. The grouping unit is preset with a distance threshold and is configured to group any two manifold airways 2 whose distance is less than or equal to the distance threshold into different groups, and group any two manifold airways 2 whose distance is greater than the distance threshold into the same group.

[0084] like Figure 2 and Figure 3 As shown, in some embodiments, all airways on the air path plate are divided into three groups A, B, and C according to the above grouping rules, and three detection channels 3 are correspondingly provided.

[0085] In some embodiments, the distance between the two air passages of the manifold plate is the minimum distance between the two air passages of the manifold plate.

[0086] It should be noted that: taking two airway plates, airway A and airway B, as an example, the minimum distance between the two airways A and B is: the set of all points in the space where airway A is located is {a}, and the set of all points in the space where airway B is located is {b}. The shortest path connecting the points in {a} and {b} while avoiding other airways is the minimum distance between airway A and airway B.

[0087] Because the risk of air cross-contamination increases with decreasing distance between adjacent airways, when testing the air tightness between manifold 2, closely spaced airways must be grouped together to test the air tightness between these groups. The distance threshold is determined by the manufacturer's brazing process for the manifold. If the manufacturer's process ensures that air cross-contamination does not occur when the distance between two airways exceeds the distance threshold, it can be assumed that there is no air cross-contamination risk between airways in the same group that are spaced greater than the distance threshold. Only air cross-contamination risk between airways in different groups will be tested.

[0088] In some embodiments, before grouping the air passages 2 of the manifold, the manifold is first subjected to water immersion ultrasonic testing. After passing the water immersion ultrasonic testing, the manifold is then tested for airtightness. The water immersion ultrasonic testing equipment can inspect the weld quality of the aluminum plate joints and display it graphically. It can also detect defects such as pores, cracks, and delamination within the sample, and has functions such as defect size identification and automatic distance measurement. Therefore, the distance acquisition module can also be a water immersion ultrasonic testing device.

[0089] In some embodiments, the detection module includes an air supply channel 4 and the same number of detection channels 3 as the grouping unit divides the detection channel 3. The air supply channel 4 is connected to each detection channel 3, and each detection channel 3 is connected to a corresponding group of airways. The air supply channel 4 is used to inflate air into each group of airways. Each detection channel 3 is equipped with a first air pressure detection device 6, which is used to detect the air pressure value of the airway after the airway is inflated.

[0090] In some embodiments, the detection module further includes an air supply device 13 , which is connected to the air supply channel 4 and is configured to provide compressed gas to the air supply channel 4 for inflating the air channel 2 of the air path plate.

[0091] In some embodiments, the judgment unit is connected to the first air pressure detection device 6 to obtain the air pressure value detected by the first air pressure detection device 6. The judgment unit is preset with an air pressure threshold and is configured to determine the air tightness of the airway where the first air pressure detection device 6 is located by comparing the air pressure value detected by the first air pressure detection device 6 with the air pressure threshold.

[0092] In some embodiments, the air supply channel 4 first simultaneously inflates all groups of manifold airways 2 to test the overall air tightness of all manifold airways. The air supply channel 4 then inflates only one group of airways or a portion of them to test the air tightness between the group or portion of airways and the remaining airways.

[0093] Compared to testing each airway individually, group testing significantly reduces the number of tests and time required, especially when there are a large number of airways. Furthermore, by rationally grouping and combining the pressure measurement of each airway group with a comparison to the pressure threshold, the airway tightness can be more accurately determined, effectively detecting even minor leaks.

[0094] In some embodiments, the detection module further includes a first switch valve 8 , which is disposed in the air supply channel 4 and is used to control the on / off state of the air supply channel 4 .

[0095] To control the on / off switching of the first switch valve 8 , in some embodiments, the control module further includes a valve control unit connected to the first switch valve 8 to control the on / off switching of the first switch valve 8 .

[0096] In some embodiments, the judgment unit is preset with a first pressure threshold, a first pressure stabilization time, and a first pressure holding time, and the control module is configured to:

[0097] When the test starts, the valve control unit turns on the first switch valve 8, and the air supply channel 4 inflates the airway;

[0098] When the judgment unit determines that the air pressure value detected by the first air pressure detection device 6 reaches the first air pressure threshold, the valve control unit disconnects the first switch valve 8, and the air supply channel 4 stops inflating;

[0099] When the judgment unit judges that the time after the air pressure value detected by the first air pressure detection device 6 reaches the first air pressure threshold reaches the first pressure stabilization time, the judgment unit obtains the stabilized air pressure value of the airway 2 of the air path plate detected by the first air pressure detection device 6;

[0100] When the judgment unit judges that the time after the air pressure value detected by the first air pressure detection device 6 reaches the first air pressure threshold reaches the first pressure holding time, the judgment unit obtains the pressure holding value of the air passage 2 of the air path plate detected by the first air pressure detection device 6.

[0101] In some embodiments, the judgment unit is preset with a first pressure drop threshold, which is configured to: compare the difference between the stabilizing air pressure value and the pressure maintaining air pressure value with the first pressure drop threshold, and when the difference between the stabilizing air pressure value and the pressure maintaining air pressure value is less than the first pressure drop threshold, judge that the air tightness of the airway where the first air pressure detection device 6 is located is qualified.

[0102] By comparing the stabilization pressure value with the holding pressure value and calculating the pressure drop, and comparing it with the first pressure drop threshold, the degree of airway leakage during the pressure holding period can be accurately quantified. In addition, the pressure stabilization time setting ensures that data collection is performed only after the pressure is stable, avoiding the interference of pressure fluctuations during the inflation process on the test results, and improving data reliability.

[0103] In some embodiments, the detection module further includes an exhaust channel 5 , a second air pressure detection device 7 , a second switch valve 9 and a third switch valve 10 .

[0104] In some embodiments, the exhaust channel 5 is used to exhaust the gas within the test channel 3 and the airway 2 of the manifold plate to the outside atmosphere after the air tightness test is completed. The exhaust channel 5 includes a main exhaust path 19 and branch exhaust paths 20. The number of branch exhaust paths 20 is the same as the number of test channels 3, and they are connected one-to-one. One end of the main exhaust path 19 is connected to all branch exhaust paths 20, and the other end is connected to the outside atmosphere.

[0105] In some embodiments, a second air pressure detection device 7 is provided in the main exhaust path 19 for detecting the air pressure in the main exhaust path 19. A second on-off valve 9 is provided in the main exhaust path 19, between the second air pressure detection device 7 and the outside atmosphere, for controlling the flow of air between the main exhaust path 19 and the outside atmosphere. A third on-off valve 10 is provided in the branch exhaust path 20, between the second air pressure detection device 7 and the manifold duct 2, for controlling the flow of air between the main exhaust path 19 and the manifold duct 2.

[0106] In some embodiments, each detection channel 3 is provided with a third switch valve 10 .

[0107] In some embodiments, the judgment unit is connected to the second air pressure detection device 7 to obtain the air pressure value detected by it. The valve control unit is connected to the second switch valve 9 and the third switch valve 10 respectively to control the opening and closing of the second switch valve 9 and the third switch valve 10.

[0108] In some embodiments, the control module is configured to:

[0109] At the beginning of the detection, the valve control unit turns on the first switch valve 8 and turns off the second switch valve 9; when the judgment unit determines that the air pressure value detected by the first air pressure detection device 6 reaches the first air pressure threshold, the valve control unit turns off the first switch valve 8; when the judgment unit determines that the time after the air pressure value detected by the first air pressure detection device 6 reaches the first air pressure threshold reaches the first pressure holding time, the judgment unit obtains the first air pressure value of the exhaust channel 5 detected by the second air pressure detection device 7.

[0110] In some embodiments, the judgment unit is preset with a first pressure difference threshold, which is configured to: compare the first air pressure value of the exhaust channel 5 with the first pressure difference threshold, and when the first air pressure value of the exhaust channel 5 is less than the first pressure difference threshold, and the difference between the stabilizing air pressure value and the maintaining air pressure value is less than the first pressure drop threshold, judge that the air tightness of the airway where the first air pressure detection device 6 is located is qualified.

[0111] The second air pressure detection device 7 can use a small-range high-precision sensor, which is specially used to detect tiny leaks. Compared with a large-range sensor, it has high detection accuracy and low cost. Even if the pressure drop in the detection channel 3 does not exceed the threshold due to the small leakage, the tiny air pressure change in the exhaust channel 5 can also be captured to avoid missing micro-leakage defects. At the same time, through the above scheme, if the air pressure value of the exhaust channel 5 is abnormal (greater than the first pressure difference threshold), but the pressure drop of the detection channel 3 is normal, it may indicate that the seal of the detection tooling has failed (such as wear of the sealing ring, leakage of the joint), rather than a defect in the airway itself. Through this mechanism, tooling problems can be quickly located, misjudgment caused by tooling leakage can be avoided, and the cost of repeated detection can be reduced.

[0112] In some embodiments, the detection module further includes a fourth on-off valve 11 and a fifth on-off valve 12. The fourth on-off valve 11 is disposed in the detection channel 3, between the first on-off valve 8 and the first air pressure detection device 6, and is used to control the connection between the air supply channel 4 and the detection channel 3. One end of the fifth on-off valve 12 is connected to the outside atmosphere, and the other end is connected to the detection channel 3 or the air supply channel 4 between the first on-off valve 8 and the third on-off valve 10, and is used to control the connection between the detection channel 3 and the air supply channel 4 between the first on-off valve 8 and the third on-off valve 10 and the outside atmosphere.

[0113] In some embodiments, each detection channel 3 is provided with a fourth switch valve 11 .

[0114] In some embodiments, the valve control unit is connected to the fourth on-off valve 11 and the fifth on-off valve 12, respectively, to control the opening and closing of the fourth on-off valve 11 and the fifth on-off valve 12. The control module is configured such that: at the beginning of detection, the valve control unit opens the fourth on-off valve 11 and opens the fifth on-off valve 12; when the determination unit determines that the air pressure value detected by the first air pressure detection device 6 reaches the first air pressure threshold, the valve control unit opens the fourth on-off valve 11 and opens the fifth on-off valve 12.

[0115] By configuring a fourth switch valve 11 for each detection channel 3, the on-off of the air supply channel 4 and each group of air channels can be independently controlled. In the group detection scenario, the inflation rate can be adjusted according to the air channel characteristics (such as pipe diameter and length) to ensure that the pressure of each group of air channels rises steadily to the target value. After the inflation is completed, disconnecting the fourth switch valve 11 can isolate the air supply channel 4 and the detection channel 3, prevent the influence of the pressure fluctuation of the air supply source on the pressure holding stage, improve the pressure stability, and is especially suitable for detection scenarios that require long-term pressure maintenance. After the inflation is completed, turning on the fifth switch valve 12 can quickly discharge the residual gas in the air supply channel 4 and the detection channel 3 to the atmosphere, thereby preventing the residual high-pressure gas from interfering with subsequent detection.

[0116] In some embodiments, the grouping unit is configured to: preset a tested group of airways, and select other groups of airways outside the tested group of airways as the test group of airways.

[0117] In some embodiments, the judgment unit is preset with a second air pressure threshold, a second pressure stabilization time, and a second pressure holding time, and the control module is configured to:

[0118] When the test starts, the valve control unit turns on the first on-off valve 8, the second on-off valve 9, the third on-off valve 10 in the test channel 3 connected to the airway of the test group, and the fourth on-off valve 11 in the test channel 3 connected to the airway of the test group, and turns off the fifth on-off valve 12;

[0119] When the judgment unit determines that the air pressure value of the test group airway detected by the first air pressure detection device 6 reaches the second air pressure threshold, the valve control unit disconnects the first on-off valve 8, the second on-off valve 9, and the fourth on-off valve 11 in the detection channel 3 connected to the test group airway, and connects the fifth on-off valve 12;

[0120] The judgment unit obtains the stabilized pressure value of the test group airway detected by the first air pressure detection device 6 when it is determined that the time after the air pressure value of the test group airway detected by the first air pressure detection device 6 reaches the second air pressure threshold reaches the second stable pressure time;

[0121] When the judgment unit determines that the time duration after the air pressure value of the test group airway detected by the first air pressure detection device 6 reaches the second air pressure threshold reaches the second pressure holding time, it obtains the pressure holding pressure value of the test group airway detected by the first air pressure detection device 6 and the second air pressure value of the exhaust channel 5 detected by the second air pressure detection device 7.

[0122] In some embodiments, the judgment unit is preset with a second pressure drop threshold and a second pressure difference threshold, which is configured to: compare the difference between the stabilizing air pressure value and the pressure maintaining air pressure value with the second pressure drop threshold, compare the difference between the first air pressure value and the second air pressure value of the exhaust channel 5 with the second pressure difference threshold, and when the difference between the stabilizing air pressure value and the pressure maintaining air pressure value is less than the first pressure drop threshold, and the difference between the first air pressure value and the second air pressure value of the exhaust channel 5 is less than the second pressure difference threshold, judge that the air tightness of the airway of the tested group is qualified.

[0123] In the above technical solution, the tested group can only be determined to be qualified when both the test group pressure drop < the second pressure drop threshold and the exhaust channel 5 pressure difference < the second pressure difference threshold are satisfied. The dual judgment criteria significantly reduce the probability of misjudgment.

[0124] At the same time, compared with directly testing the air ducts of the tested group, this testing method can determine which group of air ducts and the air ducts of the tested group have cross-flow through the indication of the first air pressure detection device when the air tightness of the air ducts of the tested group is judged to be unqualified, thereby facilitating the treatment of the cross-flow air ducts, while direct testing does not have this effect.

[0125] In some embodiments, the measuring range of the first air pressure detecting device 6 is greater than the measuring range of the second air pressure detecting device 7 , and the measuring range of the first air pressure detecting device 6 differs from the measuring range of the second air pressure detecting device 7 by one order of magnitude.

[0126] At the same accuracy level, the small-range sensor has a smaller absolute error value and can detect micro-leaks that the large-range sensor cannot detect, thus avoiding the accuracy loss caused by "measuring small signals with a large range." The first air pressure detection device 6 quickly verifies the overall tightness of the airway under high pressure, eliminating obvious leaks and reducing invalid detection. Only after the overall external leakage is qualified, the small-range sensor is activated for internal leakage or micro-external leakage detection, avoiding the increased cost and lengthy process caused by the use of high-precision sensors throughout the process.

[0127] In some embodiments, the preset values ​​of the judgment unit are set according to the manufacturer's or industry's standard requirements. Specifically, the first air pressure threshold can be set within the range of 1500kPa ± 5kPa; the first pressure stabilization time can be set to 1 minute; and the first pressure holding time can be set to 5 minutes. Air tightness testing generally requires that the leakage of each airway within 5 minutes is no more than 3-5kPa. Therefore, the first pressure drop threshold and the first pressure differential threshold can be set within the range of 3-5kPa, preferably set to 3kPa.

[0128] In some embodiments, the second air pressure threshold is the same as the setting value of the first pressure drop threshold, the second pressure stabilization time is the same as the setting value of the first pressure stabilization time, the second pressure holding time is the same as the setting value of the first pressure holding time, and the second pressure drop threshold is the same as the setting value of the first pressure drop threshold.

[0129] In some embodiments, the first switch valve 8, the second switch valve 9, the third switch valve 10, the fourth switch valve 11, and the fifth switch valve 12 are solenoid valves or shutoff valves, preferably solenoid valves. The valve control unit controls the on / off of the switch valves by controlling the power supply to the switch valves.

[0130] In some embodiments, the fifth solenoid valve is a normally open solenoid valve, and the first on-off valve 8 , the second on-off valve 9 , the third on-off valve 10 and the fourth on-off valve 11 are normally closed solenoid valves.

[0131] In some embodiments, the first air pressure detection device 6 and the second air pressure detection device 7 are pressure sensors or pressure gauges, preferably pressure sensors.

[0132] In some embodiments, the detection module further includes a first pressure reducing valve 14 and a second pressure reducing valve 15. The first pressure reducing valve 14 is disposed in the air supply channel 4, between the air supply device 13 and the first on / off valve 8. The compressed gas provided by the air supply device 13 flows through the first pressure reducing valve 14 and then into the detection channel 3. The second pressure reducing valve 15 is disposed in the exhaust channel 5, between the third on / off valve 10 and the second air pressure detection device 7. The compressed gas flowing out of the detection channel 3 flows through the second pressure reducing valve 15 and then into the second air pressure detection device 7.

[0133] The first pressure reducing valve 14 stabilizes the high-pressure gas output by the gas supply device 13 to the required pressure for testing, preventing overshoot or undershoot of the test pressure due to fluctuations in the gas source, which could affect the test results, or excessive pressure exceeding the range of the pressure detection device, which could cause damage to the equipment. The second pressure reducing valve 15 reduces the high-pressure gas discharged from the detection channel 3 to the safe operating range of the second pressure detection device 7, preventing the high-pressure gas from directly impacting the small-range sensor and causing damage or measurement errors.

[0134] In some embodiments, the air tightness detection system further includes an installation module. The installation module includes a base 16, on which the air circuit board is fitted. The air circuit board is provided with air circuit board holes connected to the air ducts on the board surface. The base 16 is provided with detection air holes that match the number, position, and shape of the air circuit board holes. The base 16 is also provided with the same number of detection air channels as the detection channels 3. One end of the detection air channel is connected to the detection channel 3, and the other end is connected to the detection air holes corresponding to the same group of air channels in the air circuit board. The compressed gas flows from the detection channel 3 through the detection air channel and the detection air holes into the air duct 2 of the air circuit board.

[0135] The detection air holes on the base 16 correspond one-to-one with the air channel 2 of the air path plate, ensuring that the compressed gas only flows into the air channel to be tested through the preset air path. The position and size of the detection air holes are standardized with the air path plate design, which is suitable for batch testing of the same model of air path plates, which can reduce testing costs and improve testing efficiency.

[0136] In some embodiments, the mounting module further includes guide pins and a clamping device 17. Both the guide pins and the clamping device 17 are mounted on the base 16. The guide pins are used to guide the placement of the air circuit board on the base 16 so that the air holes on the air circuit board are aligned with the test air holes on the base 16. The clamping devices 17 are provided at both ends of the air circuit board. After the air circuit board is aligned and placed on the base 16, the clamping devices 17 are used to fix the air circuit board to the base 16 by pressing the ends of the air circuit board.

[0137] Guide pins engage positioning holes on the manifold plate to precisely guide the manifold plate to the preset position on base 16, ensuring precise millimeter-level alignment between the air holes on the manifold plate and the test holes on base 16. This prevents misalignment of the air holes caused by manual alignment errors, eliminates the risk of tooling leaks at the source, and improves the reliability of test results. The clamping device 17 applies force evenly at both ends of the manifold plate, ensuring uniform force on the sealing ring between the manifold plate and base 16, preventing seal deformation caused by excessive local pressure.

[0138] In some embodiments, the mounting module further includes a cover plate 18 , which is fitted on the gas circuit board. The cover plate 18 is used to cover and seal the air holes on the plate surface of the gas circuit board. The cover plate 18 is mounted on the base 16 by bolts.

[0139] Cover plate 18, covering the air holes on the surface of the gas manifold that are not connected to the detection channel 3, cooperates with base 16 to form a fully enclosed detection space. At the same time, cover plate 18 and base 16 apply pressure from both sides of the gas manifold, clamping the gas manifold in the middle. The gas manifold seal is evenly stressed and can withstand higher detection pressures.

[0140] In some embodiments, the manifold includes a front and back surface. Various pneumatic valves are mounted on the front surface of the manifold, interconnected via air passages to achieve various functions. The air holes on the back surface are sometimes connected to vehicle piping, while others serve as exhaust vents for the pneumatic valves. The front surface of the manifold is in contact with the base 16, while the back surface is in contact with the cover 18.

[0141] In some embodiments, a groove is provided around the periphery of the test air hole of the base 16 for mounting a sealing ring, which seals the test air hole with the air hole of the manifold plate. A groove and a sealing ring are also provided on the cover plate 18, which seals the manifold plate with the cover plate 18.

[0142] In some embodiments, the airtightness testing system further includes a comparison and analysis unit and a data storage unit. The comparison and analysis unit is configured to perform statistical analysis on the welding rates and defects of different groups of air ducts based on the water immersion ultrasonic test results, and to correlate and compare the data with the airtightness test results. The data storage unit is configured to store the airtightness test and water immersion ultrasonic test data.

[0143] Comparative data analysis can further improve the accuracy of ultrasonic testing results. Furthermore, for workpieces that fail ultrasonic testing, airtightness testing can be performed and the airtightness data obtained can be compared and analyzed to further optimize the criteria for determining defects during ultrasonic testing. Storing both airtightness testing and ultrasonic testing data facilitates later recall by users, increasing the practicality of the testing system.

[0144] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be covered and fall within the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An air tightness detection system for testing the air tightness of multiple air passages in an air path plate, characterized in that: include: Distance acquisition module: used to collect the distance between the airways of the airway plate; The control module includes a grouping unit and a judgment unit; the grouping unit is connected to the distance acquisition module to obtain the distance between the airways of the airway plate; the grouping unit is preset with a distance threshold and is configured to: divide any two airway plates whose minimum distance is less than or equal to the distance threshold into different groups, and divide any two airway plates whose minimum distance is greater than the distance threshold into the same group; The detection module includes an air supply channel and detection channels with the same number of groups as the grouping unit, wherein the air supply channel is connected to each detection channel, and each detection channel is connected to a corresponding group of airways; the air supply channel is used to inflate air into each group of airways; each detection channel is provided with a first air pressure detection device, which is used to detect the air pressure value of the airway after the airway is inflated; The judgment unit is connected to the first air pressure detection device to obtain the air pressure value detected by it; the judgment unit is preset with an air pressure threshold, and is configured to: judge the air tightness of the airway where the first air pressure detection device is located by comparing the air pressure value detected by the first air pressure detection device with the air pressure threshold.

2. The airtightness detection system according to claim 1, characterized in that: The detection module further includes a first switch valve, which is provided in the air supply channel and is used to control the on and off of the air supply channel; The control module further includes a valve control unit, which is connected to the first switch valve to control the on and off of the first switch valve; The judgment unit is preset with a first air pressure threshold, a first pressure stabilization time, and a first pressure holding time; The control module is configured to: When the detection starts, the valve control unit turns on the first switch valve to allow the air supply channel to inflate the air into the air channel of the air channel plate; when the judgment unit determines that the air pressure value detected by the first air pressure detection device reaches a first air pressure threshold, the valve control unit turns off the first switch valve to stop the air supply channel from inflating the air into the air channel of the air channel plate; when the judgment unit determines that the time duration after the air pressure value detected by the first air pressure detection device reaches the first air pressure threshold reaches a first stable pressure duration, the judgment unit obtains the stable pressure value of the air channel of the air channel plate detected by the first air pressure detection device; The judgment unit obtains the holding pressure value of the air channel of the air path plate detected by the first air pressure detection device when it is determined that the time duration after the air pressure value detected by the first air pressure detection device reaches the first air pressure threshold reaches the first pressure holding time duration; The judgment unit is preset with a first pressure drop threshold, which is configured to: compare the difference between the stabilizing air pressure value and the maintaining air pressure value with the first pressure drop threshold, and when the difference between the stabilizing air pressure value and the maintaining air pressure value is less than the first pressure drop threshold, judge that the air tightness of the airway where the first air pressure detection device is located is qualified.

3. The airtightness detection system according to claim 2, characterized in that: The detection module also includes: Exhaust channel: used to discharge the gas in the airway of the gas manifold to the outside atmosphere; it includes an exhaust main channel and an exhaust branch channel. The number of the exhaust branches is the same as the number of the detection channels and they are connected one-to-one. One end of the exhaust main channel is connected to all the exhaust branches, and the other end is connected to the outside atmosphere. A second air pressure detection device is provided in the exhaust main path, and is used to detect the air pressure value of the exhaust main path; The second on-off valve is provided in the exhaust main path and is used to control the connection and disconnection between the exhaust main path and the outside atmosphere; The third switch valve is provided on the exhaust branch to control the connection and disconnection between the exhaust main line and the airway of the airway plate; each exhaust branch is provided with a third switch valve; The judgment unit is connected to the second air pressure detection device to obtain the air pressure value detected by it; the valve control unit is connected to the second switch valve and the third switch valve respectively to control the on and off of the second switch valve and the third switch valve; The control module is configured to: At the start of detection, the valve control unit turns on the first on-off valve and turns off the second on-off valve; when the judgment unit determines that the air pressure value detected by the first air pressure detection device reaches a first air pressure threshold, the valve control unit turns off the first on-off valve; when the judgment unit determines that the time after the air pressure value detected by the first air pressure detection device reaches the first air pressure threshold reaches a first pressure holding time, the judgment unit obtains the first air pressure value of the exhaust channel detected by the second air pressure detection device; The judgment unit is preset with a first pressure difference threshold, which is configured to: compare the first air pressure value of the exhaust channel with the first pressure difference threshold, and when the first air pressure value of the exhaust channel is less than the first pressure difference threshold, and the difference between the stabilizing air pressure value and the maintaining air pressure value is less than the first pressure drop threshold, judge that the air tightness of the air channel where the first air pressure detection device is located is qualified.

4. The airtightness detection system according to claim 3, characterized in that: The detection module also includes: A fourth switch valve is provided in the detection channel, and is used to control the connection and disconnection between the gas supply channel and the detection channel; each detection channel is provided with a fourth switch valve; The fifth switch valve: one end is connected to the outside atmosphere, and the other end is connected to the detection channel or the air supply channel between the first switch valve and the third switch valve, and is used to control the connection and disconnection between the detection channel and the air supply channel between the first switch valve and the third switch valve and the outside atmosphere; The valve control unit is connected to the fourth switch valve and the fifth switch valve respectively to control the on and off of the fourth switch valve and the fifth switch valve; The control module is configured as follows: when starting detection, the valve control unit turns on the fourth switch valve and turns off the fifth switch valve; when the judgment unit determines that the air pressure value detected by the first air pressure detection device reaches the first air pressure threshold, the valve control unit turns off the fourth switch valve and turns on the fifth switch valve.

5. The airtightness detection system according to claim 4, characterized in that: The grouping unit is configured to: preset a tested group of airways, and select other groups of airways outside the tested group of airways as the test group of airways; The judgment unit is preset with a second air pressure threshold, a second pressure stabilization time, and a second pressure holding time; The control module is configured to: When starting the test, the valve control unit turns on the first switch valve, the second switch valve, the third switch valve in the test channel connected to the airway of the test group, and the fourth switch valve in the test channel connected to the airway of the test group, and turns off the fifth switch valve; When the judgment unit determines that the air pressure value of the test group airway detected by the first air pressure detection device reaches the second air pressure threshold, the valve control unit disconnects the first switch valve, the second switch valve, and the fourth switch valve in the detection channel connected to the test group airway, and connects the fifth switch valve; The judgment unit obtains the stabilized pressure value of the test group airway detected by the first air pressure detection device when it is judged that the time after the air pressure value of the test group airway detected by the first air pressure detection device reaches the second air pressure threshold reaches the second pressure stabilization time; The judgment unit obtains the holding pressure value of the test group airway detected by the first air pressure detection device and the second air pressure value of the exhaust channel detected by the second air pressure detection device when it is determined that the time duration after the air pressure value of the test group airway detected by the first air pressure detection device reaches the second air pressure threshold reaches the second pressure holding time duration; The judgment unit is preset with a second pressure drop threshold and a second pressure difference threshold, and is configured to: compare the difference between the stabilizing air pressure value and the pressure maintaining air pressure value with the second pressure drop threshold, compare the difference between the first air pressure value and the second air pressure value of the exhaust channel with the second pressure difference threshold, and judge that the air tightness of the air channel of the tested group is qualified when the difference between the stabilizing air pressure value and the pressure maintaining air pressure value is less than the first pressure drop threshold, and the difference between the first air pressure value and the second air pressure value of the exhaust channel is less than the second pressure difference threshold.

6. The airtightness detection system according to any one of claims 3 to 5, characterized in that: The measuring range of the first air pressure detecting device is greater than the measuring range of the second air pressure detecting device, and the measuring range of the first air pressure detecting device differs from the measuring range of the second air pressure detecting device by one order of magnitude.

7. The airtightness detection system according to any one of claims 3 to 5, characterized in that: The detection module also includes: Gas supply device: connected to the gas supply channel, used to provide compressed gas to the gas supply channel; A first pressure reducing valve is provided in the gas supply channel, between the gas supply device and the first switch valve. The compressed gas provided by the gas supply device flows into the detection channel after passing through the first pressure reducing valve. The second pressure reducing valve is provided in the exhaust passage, between the third switch valve and the second air pressure detection device. The compressed gas flowing out of the detection passage passes through the second pressure reducing valve and then flows to the second air pressure detection device.

8. The airtightness detection system according to claim 7, characterized in that: It also includes a mounting module, the mounting module includes a base, and the gas circuit board is fitted on the base; The base is provided with detection air holes that match the air channels in the air path plate, and the base is further provided with detection air channels with the same number as the detection channels, one end of the detection air channel is connected to the detection channel, and the other end is connected to the detection air holes corresponding to the same group of air channels in the air path plate; The compressed gas flows from the detection channel through the detection airway and the detection air hole into the airway of the air path plate.

9. The airtightness detection system according to claim 8, characterized in that: The mounting module further comprises a guide pin and a pressing device, both of which are mounted on the base; The guide pins are used to guide the placement of the air manifold on the base so that the air holes on the air manifold are aligned with the test air holes on the base; The pressing device is provided at both ends of the gas circuit board, and is used to fix the gas circuit board on the base by pressing the two ends of the gas circuit board after the gas circuit board is aligned and placed on the base.

10. The airtightness detection system according to claim 8, characterized in that: The installation module further comprises a cover plate, which is fitted on the gas circuit board and is used to cover and seal the air holes on the plate surface of the gas circuit board.

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