Airtightness test system
By designing an airtight testing system that includes a variety of solenoid valves and detectors, the problem of traditional systems lacking their own leakage detection is solved, and higher testing accuracy and efficiency are achieved.
Patent Information
- Application Number
- CN202510210262.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2025-06-06
AI Technical Summary
The traditional airtight testing system has a single function and lacks its own leakage detection, which affects the accuracy of the test.
An air-tight testing system is designed, including an air source, a test chamber, a two-position three-way solenoid valve, a two-position three-way solenoid valve, a pneumatic pressure detector and a flowmeter. By switching the air path and controlling the solenoid valve, leakage detection and multi-parameter monitoring of the test space itself can be realized.
It improves the accuracy and accuracy of test results, enhances the testing efficiency, and achieves more refined parameter control through multi-channel gas circuit switching and sharing of detection components.
Smart Images
Figure CN120102049A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of testing equipment, and in particular relates to an airtight testing system. Background Art
[0002] Airtightness test is a method to detect the sealing performance of a product. It mainly judges the airtightness of the product by filling the product with gas and detecting whether the gas leaks. Common airtightness test systems generally inject pressurized gas into a pressure cooker where the product to be tested is placed, and then monitor the air pressure in the pressure cooker to evaluate the sealing performance of the tested product. At present, the traditional airtightness test system has relatively simple functions and can only meet basic air pressure function tests. It lacks its own leakage detection, which may affect the accuracy of the test. Summary of the invention
[0003] The purpose of the present invention is to provide an airtight testing system to solve the technical defects described in the background technology.
[0004] The airtightness testing system is applied to a pressure cooker, which includes an air source, which is used to supply air to a test chamber in a high-pressure pipe. The test chamber is connected to a two-position three-way solenoid valve for air pressure and at least two two-position three-way solenoid valves for flow. A residual two-position two-way solenoid valve and an air pressure detector are connected in parallel to a first outlet of the two-position three-way solenoid valve for air pressure. The residual two-position two-way solenoid valve is used to discharge the residual pressure of the pipeline connected to the air pressure detector. The air pressure detector is used to monitor the air pressure changes in the test chamber during the entire test process and provide relevant communications to a host computer so as to adjust the test chamber to different step air pressures. A flow meter is connected to the first outlet of each two-position three-way solenoid valve for flow, and the flow meter is used to monitor the flow of the test chamber during the test process. The second outlet of the two-position three-way solenoid valve for air pressure is connected in parallel to the second outlets of all the two-position three-way solenoid valves for flow.
[0005] Based on the above technical solution, the present invention achieves the following beneficial effects: 1. Since the test chamber is connected with a two-position three-way solenoid valve for air pressure and at least two two-position three-way solenoid valves for flow, the first outlet of the two-position three-way solenoid valve for air pressure is connected with an air pressure detector, and at the same time, the first outlet of the two-position three-way solenoid valve for flow is connected with a flow meter, therefore, before the product to be tested is placed in the test space, by switching different air paths to activate corresponding detection elements (such as air pressure detector, flow meter), etc., the test space itself can be leak-detected, thereby improving the accuracy of the test results when testing the product to be tested; 2. Since the single-channel and multi-channel gas circuits can be switched to obtain different parameters of the test space in sequence and independently, the test product can be judged based on a combination of multiple parameters, thereby further improving the test accuracy. In addition, multiple detection elements can also be controlled to share the same gas circuit, thereby improving the test efficiency; 3. Since the first outlet of the air pressure two-position three-way solenoid valve is also connected in parallel with a residual two-position two-way solenoid valve, when the test space is tested for leakage itself, the residual pressure in the pipeline can be discharged through the residual two-position two-way solenoid valve, thereby further improving the detection accuracy.
[0006] In some embodiments, the test chamber is connected to an exhaust two-position two-way solenoid valve, which is used to deflate the test chamber after the test is completed; Based on the technical solution, when the air pressure in the test space is too high or when the test product is taken in and placed in the test space, the air pressure inside the subordinate space can be adjusted by controlling the opening and closing of the exhaust two-position two-way solenoid valve, thereby improving the accuracy and safety of the test.
[0007] In some embodiments, the test chamber is connected to four flow two-position three-way solenoid valves; Based on the technical solution, multiple flow meters can be connected to the test space by opening and closing the flow two-position three-way solenoid valve sequentially or simultaneously, so as to compare the data sensed by the multiple flow meters, thereby further improving the test accuracy.
[0008] In some embodiments, the output end of the gas source is provided with a slow start valve, a triplet and a safety valve which are sequentially connected. The slow start valve is used to enable the gas source to supply gas slowly so that the air pressure in the test chamber is stable, thereby preventing the impact force of sudden startup. The triplet is used to filter and adjust the pressure of the air output by the gas source. The safety valve is used to prevent accidents during emergency stop linkage and exhaust stop.
[0009] In some embodiments, a precision pressure regulating valve, a proportional valve, and an air intake two-position two-way solenoid valve are provided at the air flow input end of the test chamber, so that the air passes through the precision pressure regulating valve, the proportional valve, and the air intake two-position two-way solenoid valve in sequence before entering the test chamber, the precision pressure regulating valve is used to control the air pressure passing through the proportional valve, the proportional valve is used to adjust the input air pressure of the test chamber in a stepwise manner, and the air intake two-position two-way solenoid valve is used to open and close the proportional valve and the test chamber; Based on the above technical solution, the air source can deliver a set amount of air to the test space in a high-quality, stable and smooth manner, thereby avoiding damage to components and products caused by a large difference in air pressure in the test space in a short period of time.
[0010] In some embodiments, the safety valve is connected to the precision pressure regulating valve through a pipeline through an air supply pipeline, the air pipeline is connected in parallel with an opening and closing three-position five-way solenoid valve and a clamping three-position five-way solenoid valve, the opening and closing three-position five-way solenoid valve is connected to an opening and closing double-acting cylinder, the opening and closing three-position five-way solenoid valve is used to control the inlet and outlet direction of the air of the opening and closing double-acting cylinder, the opening and closing double-acting cylinder is used to drive the switch cover of the pressure cooker so that the tested product can be placed in the test chamber, the clamping three-position five-way solenoid valve is connected to the clamping double-acting cylinder, the clamping three-position five-way solenoid valve is used to control the inlet and outlet direction of the air of the clamping double-acting cylinder, and the clamping double-acting cylinder is used to drive the pressure cooker to rotate and clamp, so as to improve the sealing of the test chamber; Based on the technical solution, the same gas source and the same pipeline can be used to control the opening and closing of the test space cover, control the test space to hold the cover, and increase the air pressure in the test space, so as to reduce the number of gas sources to be set, thereby reducing the manufacturing cost of the equipment.
[0011] In some embodiments, the air pipeline is also connected in parallel with a module three-position five-way solenoid valve, the module three-position five-way solenoid valve is connected to a module double-acting cylinder, the module three-position five-way solenoid valve is used to control the inlet and outlet direction of air of the module double-acting cylinder, and the module double-acting cylinder is used to drive the motion control of the test module located in the test chamber; Based on the technical solution, the same gas source and the same pipeline can be used to drive and control the test module located in the test space to fix the test product and send it into the test space. At the same time, the air pressure in the test space can be increased to reduce the number of gas sources set up, thereby reducing the manufacturing cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to more clearly illustrate the specific implementation of the present invention, the following is a brief description of the drawings and reference numerals required to be used in describing the specific implementation.
[0013] Figure 1 It is a pipeline layout diagram of the present invention; Figure 2 It is the pipeline layout diagram near the test chamber of the present invention; Figure 3 It is a diagram of the airflow direction when the present invention is testing the product to be tested in the test space; Figure 4 is an airflow direction diagram when testing the air tightness of the test space according to the present invention; Figure 5 It is a diagram of the air flow direction when the air path is subjected to airtightness detection according to the present invention.
[0014] Reference numerals: 1. Air source; 11. Slow start valve; 12. Triplex; 13. Safety valve; 2. Open and close three-position five-way solenoid valve; 21. Open and close double-acting cylinder; 3. Hold three-position five-way solenoid valve; 31. Hold double-acting cylinder; 4. Module three-position five-way solenoid valve; 41. Module double-acting cylinder; 42. Test module; 5. Precision pressure regulating valve; 51. Proportional valve; 52. Inlet two-position two-way solenoid valve; 6. Air pressure two-position three-way solenoid valve; 61. Residual two-position two-way solenoid valve; 62. Air pressure detector; 7. Flow two-position three-way solenoid valve; 72. Flow meter; 8. Pressure cooker; 9. Test chamber; 91. Exhaust two-position two-way solenoid valve. DETAILED DESCRIPTION
[0015] In order to make the objectives, technical solutions and advantages of the present invention more clear, this specific implementation method further describes the present invention in detail with reference to the accompanying drawings.
[0016] like Figures 1 to 5 As shown, this specific embodiment provides an airtightness testing system, which is applied to a pressure cooker 8.
[0017] The airtight test system includes an air source 1, which is used to supply air to a test chamber 9 in a high-pressure pipe. The test chamber 9 is connected to a two-position three-way air pressure solenoid valve 6 and at least two two-position three-way flow solenoid valves 7. The first outlet of the two-position three-way air pressure solenoid valve 6 is connected in parallel with a residual two-position two-way solenoid valve 61 and an air pressure detector 62. The residual two-position two-way solenoid valve 61 is used to discharge the residual pressure of the pipeline connected to the air pressure detector 62. The air pressure detector 62 is used to monitor the air pressure changes of the test chamber 9 during the entire test process and provide relevant communications to the host computer so as to adjust the test chamber 9 to different steps of air pressure. The first outlet of each two-position three-way flow solenoid valve 7 is connected to a flow meter 72. The flow meter 72 is used to monitor the flow of the test chamber 9 during the test process. The second outlet of the two-position three-way air pressure solenoid valve 6 is connected in parallel with the second outlets of all the two-position three-way flow solenoid valves 7.
[0018] Since the test chamber 9 is connected with a two-position three-way air pressure solenoid valve 6 and at least two two-position three-way flow solenoid valves 7, the first outlet of the two-position three-way air pressure solenoid valve is connected with an air pressure detector 62, and at the same time, the first outlet of the two-position three-way flow solenoid valve 7 is connected with a flow meter 72, therefore, before the product to be tested is placed in the test space, different air paths can be switched to activate corresponding detection elements (such as air pressure detector 62, flow meter 72), so as to realize leakage detection of the test space itself, so as to improve the accuracy of the test result when testing the product to be tested. In addition, since the single-channel and multi-channel gas circuits can be switched to sequentially and independently obtain different parameters of the test space, the test product can be judged based on a combination of multiple parameters, thereby further improving the test accuracy. In addition, multiple detection elements can also be controlled to share the same gas circuit, thereby improving the test efficiency. At the same time, since the first outlet of the air pressure two-position three-way solenoid valve 6 is also connected in parallel with the residual two-position two-way solenoid valve 61, when the test space is subjected to self-leakage detection, the residual residual pressure in the pipeline can be discharged through the residual two-position two-way solenoid valve 61, thereby further improving the detection accuracy.
[0019] In this embodiment, the test chamber 9 is connected to an exhaust 2-position 2-way solenoid valve 91 . After the test is completed, the exhaust 2-position 2-way solenoid valve 91 is used to deflate the test chamber 9 .
[0020] When the air pressure in the test space is too high or when the test product is placed in the test space, the air pressure inside the subordinate space can be adjusted by controlling the opening and closing of the exhaust two-position two-way solenoid valve 91, thereby improving the accuracy and safety of the test.
[0021] In this embodiment, the test chamber 9 is connected to four two-position three-way flow solenoid valves 7; therefore, the two-position three-way flow solenoid valves 7 can be opened and closed sequentially or simultaneously to connect multiple flow meters 72 to the test space, thereby comparing the data sensed by the multiple flow meters 72, thereby further improving the test accuracy.
[0022] In this embodiment, the output end of the gas source 1 is provided with a slow start valve 11, a triplet 12 and a safety valve 13 which are connected in sequence. The slow start valve 11 is used to enable the gas source 1 to supply gas slowly, so that the air pressure in the test chamber 9 is stable, thereby preventing the impact force of sudden startup. The triplet 12 is used to filter and adjust the pressure of the air output by the gas source 1. The safety valve 13 is used to prevent accidents during emergency stop linkage and exhaust stop, wherein the triplet 12 includes an air filter, a pressure reducing valve and an oil mist collector.
[0023] In this embodiment, the airflow input end of the test chamber 9 is provided with a precision pressure regulating valve 5, a proportional valve 51 and an air intake two-position two-way solenoid valve 52, so that the air passes through the precision pressure regulating valve 5, the proportional valve 51 and the air intake two-position two-way solenoid valve 52 in sequence before entering the test chamber 9. The precision pressure regulating valve 5 is used to control the air pressure passing through the proportional valve 51, the proportional valve 51 is used to adjust the input air pressure of the test chamber 9 in a stepwise manner, and the air intake two-position two-way solenoid valve 52 is used to connect and disconnect the proportional valve 51 and the test chamber 9. Therefore, the air source 1 can deliver a set amount of air to the test space in a high-quality, stable and smooth manner, thereby avoiding the test space from having a large difference in air pressure in a short period of time, which may cause damage to components and products.
[0024] In the present embodiment, the safety valve 13 is connected to the precision pressure regulating valve 5 through a pipeline through an air supply pipeline. The air pipeline is connected in parallel with an opening and closing three-position five-way solenoid valve 2 and a clamping three-position five-way solenoid valve 3. The opening and closing three-position five-way solenoid valve 2 is connected to an opening and closing double-acting cylinder 21. The opening and closing three-position five-way solenoid valve 2 is used to control the inlet and outlet direction of the air of the opening and closing double-acting cylinder 21. The opening and closing double-acting cylinder 21 is used to drive the switch cover of the pressure cooker 8 so that the tested product can be placed in the test chamber 9. The clamping three-position five-way solenoid valve 3 is connected to the clamping double-acting cylinder 31. The clamping three-position five-way solenoid valve 3 is used to control the inlet and outlet direction of the air of the clamping double-acting cylinder 31. The clamping double-acting cylinder 31 is used to drive the pressure cooker 8 to rotate and clamp, so as to improve the sealing of the test chamber 9.
[0025] Therefore, the same gas source 1 and the same pipeline can be used to control the opening and closing of the test space cover, control the test space cover to be tightened, and increase the air pressure in the test space, so as to reduce the number of gas sources 1 to be set, thereby reducing the manufacturing cost of the equipment.
[0026] In this embodiment, the air pipeline is also connected in parallel with a module three-position five-way solenoid valve 4, and the module three-position five-way solenoid valve 4 is connected to a module double-acting cylinder 41. The module three-position five-way solenoid valve 4 is used to control the inlet and outlet directions of the air of the module double-acting cylinder 41, and the module double-acting cylinder 41 is used to drive the action control of the test module 42 located in the test chamber 9.
[0027] Therefore, the same gas source 1 and the same pipeline can be used to drive and control the test module 42 located in the test space to fix the test product and send it into the test space. At the same time, the air pressure in the test space can be increased to reduce the number of gas sources 1 set up, thereby reducing the manufacturing cost of the equipment.
[0028] In order to more clearly illustrate the airtightness testing system described in this specific implementation mode, the following embodiments are listed. Example
[0029] like Figures 1 to 5As shown, this embodiment provides an airtightness testing system, which is applied to a pressure cooker 8.
[0030] like Figure 1 As shown, an airtightness test system includes an air source 1, the output end of the air source 1 is provided with a slow start valve 11, a triplet 12 and a safety valve 13 connected in sequence, the slow start valve 11 is used to enable the air source 1 to supply air slowly, so that the air pressure of the test chamber 9 is stable, thereby preventing the impact force of sudden startup, the triplet 12 is used to filter and adjust the pressure of the air output by the air source 1, and the safety valve 13 is used to prevent accidents during emergency stop linkage and exhaust stop. The output end of the safety valve 13 is connected to an air supply pipeline. The air supply pipeline is connected in parallel with a three-position five-way solenoid valve 2 for opening and closing, a three-position five-way solenoid valve 3 for clamping, a three-position five-way solenoid valve 4 for module and a precision pressure regulating valve 5.
[0031] The opening and closing three-position five-way solenoid valve 2 is connected to an opening and closing double-acting cylinder 21, and the opening and closing three-position five-way solenoid valve 2 is used to control the inlet and outlet direction of the air of the opening and closing double-acting cylinder 21. The opening and closing double-acting cylinder 21 is used to drive the switch cover of the pressure cooker 8 so that the tested product can be placed in the test chamber 9. The clamping three-position five-way solenoid valve 3 is connected to a clamping double-acting cylinder 31, and the clamping three-position five-way solenoid valve 3 is used to control the inlet and outlet direction of the air of the clamping double-acting cylinder 31. The clamping double-acting cylinder 31 is used to drive the pressure cooker 8 to rotate and clamp, so as to improve the sealing of the test chamber 9.
[0032] like Figure 2 As shown, the module three-position five-way solenoid valve 4 is connected to a module double-acting cylinder 41, and the module three-position five-way solenoid valve 4 is used to control the inlet and outlet directions of the air of the module double-acting cylinder 41, and the module double-acting cylinder 41 is used to drive the action control of the test module 42 located in the test chamber 9.
[0033] The output end of the precision pressure regulating valve 5 is connected to a proportional valve 51 and an air intake two-position two-way solenoid valve 52 in sequence, so that the air passes through the precision pressure regulating valve 5, the proportional valve 51 and the air intake two-position two-way solenoid valve 52 in sequence before entering the test chamber 9 of the pressure cooker 8. The precision pressure regulating valve 5 is used to control the air pressure passing through the proportional valve 51, the proportional valve 51 is used to adjust the input air pressure of the test chamber 9 in a step-by-step manner, and the air intake two-position two-way solenoid valve 52 is used to open and close the proportional valve 51 and the test chamber 9.
[0034] The test chamber 9 is connected to a two-position three-way air pressure solenoid valve 6 and four two-position three-way flow solenoid valves 7. The first outlet of the two-position three-way air pressure solenoid valve 6 is connected in parallel with a residual two-position two-way solenoid valve 61 and a pressure detector 62. The residual two-position two-way solenoid valve 61 is used to discharge the residual pressure of the pipeline connected to the pressure detector 62. The pressure detector 62 is used to monitor the pressure change of the test chamber 9 during the entire test process and provide relevant communications to the host computer to adjust the test chamber 9 to different steps of pressure. The first outlet of each of the two-position three-way flow solenoid valves 7 is connected to a flow meter 72, and the flow meter 72 is used to monitor the flow of the test chamber 9 during the test process. The second outlet of the two-position three-way air pressure solenoid valve 6 is connected in parallel with the second outlets of all the two-position three-way flow solenoid valves 7.
[0035] The test chamber 9 is connected to an exhaust 2-position 2-way solenoid valve 91 . After the test is completed, the exhaust 2-position 2-way solenoid valve 91 is used to deflate the test chamber 9 .
[0036] The following is a working process of an airtightness testing system described in this embodiment.
[0037] Before testing the product to be tested in the test space, the air output by the air source 1 passes through the slow start valve 11, the three-way fitting 12, and the safety valve 13 in sequence to reach the air supply pipeline. At this time, the air intake two-position two-way solenoid valve 52 is in a closed state. At the same time, the air of the double-acting cylinder 21 is driven to open and close by controlling the opening and closing of the three-position five-way solenoid valve 2 and the clamping of the double-acting cylinder 31 is driven to clamp by controlling the clamping of the three-position five-way solenoid valve 3, thereby completing the delivery of the product to be tested into the test space and fixing it, and completing the closing and clamping of the door cover of the test space.
[0038] like Figure 3As shown, when testing the product to be tested in the test space, the air output by the air source 1 passes through the slow start valve 11, the triplex 12, the safety valve 13, the air supply pipeline, the precision pressure regulating valve 5, the proportional valve 51 and the air intake two-position two-way solenoid valve 52 in sequence. At this time, the air intake two-position two-way solenoid valve 52 is in an open state, and the exhaust two-position two-way solenoid valve 91 is in a closed state. Therefore, air enters the test space to make the air pressure in the test air reach the set pressure. Thereafter, the air intake two-position two-way solenoid valve 52 is closed to keep the pressure in the test space. Thereafter, by controlling the air pressure two-position three-way solenoid valve 6 and all flow two-position three-way solenoid valves 7, the flowmeter 72 and the air pressure detector 62 are connected to the test space, so as to read the air pressure data in the test space to complete the test work. After completing the test work, the exhaust two-position two-way solenoid valve 91 is controlled to be open to exhaust the air in the test space. Thereafter, the air pressure two-position three-way solenoid valve 6 can be selectively closed or opened, and then each flow two-position three-way solenoid valve 7 can be opened one by one, so that each flow meter 72 is individually connected to the test space, and the flow and flow velocity data sensed by multiple flow meters 72 are calculated for correction.
[0039] like Figure 4 As shown, when testing the air tightness of the test space, the air output by the air source 1 passes through the slow start valve 11, the triplet 12, the safety valve 13, the air supply pipeline, the precision pressure regulating valve 5, the proportional valve 51 and the air intake two-position two-way solenoid valve 52 in sequence. At this time, the air intake two-position two-way solenoid valve 52 is in an open state, and the exhaust two-position two-way solenoid valve 91 is in a closed state. Therefore, air enters the test space to make the air pressure in the test air reach the set pressure. Thereafter, the air intake two-position two-way solenoid valve 52 is closed to keep the pressure in the test space. Thereafter, the air pressure two-position three-way solenoid valve 6 is controlled to be opened so that the test space is connected to the air pressure detector 62. At the same time, the flow two-position three-way solenoid valve 7 is controlled to be closed so that the flow meter 72 is cut off from the test space to test the sealed box of the test space separately.
[0040] like Figure 5As shown, when the air circuit of an airtight test system is tested for airtightness, the air output by the air source 1 passes through the slow start valve 11, the triplet 12, the safety valve 13, the air supply pipeline, the precision pressure regulating valve 5, the proportional valve 51 and the air intake two-position two-way solenoid valve 52 in sequence. At this time, the air intake two-position two-way solenoid valve 52 is in an open state, and the exhaust two-position two-way solenoid valve 91 is in a closed state. Therefore, the air enters the test space to make the air pressure in the test air reach the set pressure. Thereafter, the air intake two-position two-way solenoid valve 52 is closed to keep the pressure in the test space. Thereafter, the air pressure two-position three-way solenoid valve 6 is closed or opened, and then each flow two-position three-way solenoid valve 7 is opened one by one, so that each flow meter 72 is connected to the test space individually, and the pipeline used by the flow meter 72 connected to the test space forms a closed loop, thereby realizing the sealing test of each part of the pipeline.
Claims
1. An airtightness testing system, applied to a pressure cooker (8), characterized in that: The invention comprises an air source (1), wherein the air source (1) is used to supply air to a test chamber (9) in the high-pressure pipe, wherein the test chamber (9) is connected to a two-position three-way air pressure solenoid valve (6) and at least two two-position three-way flow solenoid valves (7), wherein a first outlet of the two-position three-way air pressure solenoid valve (6) is connected in parallel to a residual two-position two-way solenoid valve (61) and an air pressure detector (62), wherein the residual two-position two-way solenoid valve (61) is used to discharge residual pressure in a pipeline connected to the air pressure detector (62), and the air pressure detector (62) is connected to the first outlet of the two-position three-way air pressure solenoid valve (6). The detector (62) is used to monitor the air pressure changes in the test chamber (9) during the entire test process and provide relevant communications to the host computer so as to adjust the test chamber (9) to different levels of air pressure. The first outlet of each of the two-position three-way flow solenoid valves (7) is connected to a flow meter (72), and the flow meter (72) is used to monitor the flow of the test chamber (9) during the test process. The second outlet of the air pressure two-position three-way solenoid valve (6) is connected in parallel with the second outlets of all the two-position three-way flow solenoid valves (7).
2. The airtightness test system according to claim 1, characterized in that: The test chamber (9) is connected to an exhaust two-position two-way solenoid valve (91). After the test is completed, the exhaust two-position two-way solenoid valve (91) is used to deflate the test chamber (9).
3. The airtightness testing system according to claim 1, characterized in that: The test chamber (9) is connected to four flow two-position three-way solenoid valves (7).
4. The airtightness testing system according to claim 1, characterized in that: The output end of the gas source (1) is provided with a slow start valve (11), a triplet (12) and a safety valve (13) which are connected in sequence. The slow start valve (11) is used to enable the gas source (1) to supply gas slowly, so that the gas pressure in the test chamber (9) is stable, thereby preventing the impact force of sudden startup. The triplet (12) is used to filter and adjust the pressure of the air output by the gas source (1). The safety valve (13) is used to prevent accidents during emergency stop linkage and exhaust stop.
5. The airtightness testing system according to claim 4, characterized in that: A precision pressure regulating valve (5), a proportional valve (51) and an air intake two-position two-way solenoid valve (52) are arranged at the air flow input end of the test chamber (9), so that the air passes through the precision pressure regulating valve (5), the proportional valve (51) and the air intake two-position two-way solenoid valve (52) in sequence before entering the test chamber (9); the precision pressure regulating valve (5) is used to control the air pressure passing through the proportional valve (51); the proportional valve (51) is used to adjust the input air pressure of the test chamber (9) in a stepwise manner; and the air intake two-position two-way solenoid valve (52) is used to connect and disconnect the proportional valve (51) and the test chamber (9).
6. The airtightness testing system according to claim 5, characterized in that: The safety valve (13) is connected to the precision pressure regulating valve (5) through a pipeline through an air supply pipeline. The air pipeline is connected in parallel with an opening and closing three-position five-way solenoid valve (2) and a clamping three-position five-way solenoid valve (3). The opening and closing three-position five-way solenoid valve (2) is connected to an opening and closing double-acting cylinder (21). The opening and closing three-position five-way solenoid valve (2) is used to control the inlet and outlet directions of the air of the opening and closing double-acting cylinder (21). The opening and closing double-acting cylinder (21) is used to drive the opening and closing cover of the pressure cooker (8) so that the tested product can be placed in the test chamber (9). The clamping three-position five-way solenoid valve (3) is connected to a clamping double-acting cylinder (31). The clamping three-position five-way solenoid valve (3) is used to control the inlet and outlet directions of the air of the clamping double-acting cylinder (31). The clamping double-acting cylinder (31) is used to drive the pressure cooker (8) to rotate and clamp, so as to improve the sealing performance of the test chamber (9).
7. The airtightness testing system according to claim 6, characterized in that: The air pipeline is also connected in parallel with a module three-position five-way solenoid valve (4), and the module three-position five-way solenoid valve (4) is connected to a module double-acting cylinder (41). The module three-position five-way solenoid valve (4) is used to control the inlet and outlet directions of air of the module double-acting cylinder (41), and the module double-acting cylinder (41) is used to drive the action control of the test module (42) located in the test chamber (9).