Airtightness detection device for closed container
By combining a single-path design with a pneumatic vacuum generator, the problems of pressure fluctuations and external contamination in the airtightness testing of sealed containers are solved, and automatic inflation rate control and rapid venting are achieved, thereby improving testing efficiency and equipment reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING WDKANGYUAN TECH DEV
- Filing Date
- 2025-05-23
- Publication Date
- 2026-04-24
AI Technical Summary
Existing technologies for testing the airtightness of sealed containers suffer from problems such as pressure fluctuations caused by branch switching, complex and easily damaged components, limited exhaust speed, and external air pollution.
It adopts a single-path design, using a second solenoid valve and pressure sensor in conjunction with the control module to automatically adjust the inflation rate, and combines a pneumatic vacuum generator to accelerate the exhaust. The gas is discharged through the second pipeline, simplifying the component structure and controlling the operation of the pneumatic vacuum generator.
It achieves automatic inflation control without pressure fluctuations and rapid venting, preventing sealed containers from being contaminated by outside air, thus improving testing efficiency and equipment reliability.
Smart Images
Figure CN224163324U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of airtightness testing, and in particular to an airtightness testing device for a sealed container. Background Technology
[0002] Currently, in fields such as medical, biological, and chemical engineering, some flexible sealed containers require sealing performance testing to determine whether they have leakage defects. After the test is completed, it may also be necessary to purge the air from the sealed container for easy storage.
[0003] The relevant technology involves multiple branches in the intake manifold, each equipped with a high-flow-rate electro-proportional valve and a high-precision electro-proportional valve. The inflation rate is controlled by switching between these branches and adjusting the opening size of the high-flow-rate and high-precision electro-proportional valves. The exhaust method utilizes a three-way solenoid valve in the intake manifold; exhaust is achieved by switching the air port of this three-way solenoid valve.
[0004] The aforementioned technologies have several drawbacks: switching branches can cause pressure fluctuations, affecting the detection accuracy of low-pressure containers; the components for controlling the intake rate are complex to design and have many parts that are easily damaged; the exhaust speed is limited by the valve body diameter; and sealed containers are easily contaminated by external backflow air. Utility Model Content
[0005] To simplify the components for automatically controlling the intake rate, avoid pressure fluctuations, accelerate the exhaust speed, and prevent the sealed container from being contaminated by external backflow air, this application provides an airtightness detection device for a sealed container.
[0006] This application provides an airtightness testing device for a sealed container, which adopts the following technical solution:
[0007] An airtightness testing device for a sealed container includes a gas source, a first pipeline, and a control module. A first end of the first pipeline is connected to the gas source, and a second end of the first pipeline is used to connect to the sealed container under test. A second solenoid valve and a second three-way connector are sequentially arranged on the first pipeline. The second solenoid valve has a first air port and a second air port. The first air port of the second solenoid valve is connected to the gas source, and the second air port of the second solenoid valve is connected to the first end of the second three-way connector. The second end of the second three-way connector is used to connect to the sealed container under test. A pressure sensor is provided on the third end of the second three-way connector. The pressure sensor is used to measure the pressure inside the sealed container under test. The control module is electrically connected to the second solenoid valve and the pressure sensor, and is used to detect the airtightness of the sealed container under test based on changes in the pressure sensor reading, and to adjust the opening and closing of the second solenoid valve to adjust the inflation rate based on the pressure sensor reading.
[0008] By adopting the above technical solution, the components for automatically controlling the inflation rate are simplified, and pressure fluctuations caused by branch switching are avoided.
[0009] Optionally, the airtightness testing device for the sealed container further includes a second pipeline. A first solenoid valve is also provided on the first gas pipeline at a position between the gas source and the second solenoid valve. The first solenoid valve has a first solenoid valve first port, a first solenoid valve second port, and a first solenoid valve third port. The first solenoid valve first port is connected to the gas source, the first solenoid valve second port is connected to the second solenoid valve first port, and the first solenoid valve third port is connected to one end of the second pipeline. The control module is electrically connected to the first solenoid valve to control the connection between the first solenoid valve second port and the first solenoid valve third port to discharge the gas in the sealed container under test through the second pipeline.
[0010] By adopting the above technical solution, the gas inside the sealed container being tested is discharged through the second pipeline.
[0011] Optionally, a pneumatic vacuum generator is provided at one end of the second pipeline away from the third air port of the first solenoid valve. The pneumatic vacuum generator is provided with a negative pressure port and an exhaust port. The negative pressure port is connected to the third air port of the first solenoid valve to generate negative pressure relative to the sealed container being tested.
[0012] By adopting the above technical solution, the exhaust speed is accelerated, and the sealed container is prevented from being contaminated by external backflow air.
[0013] Optionally, a muffler is provided on the exhaust port.
[0014] By adopting the above technical solutions, the noise during exhaust can be reduced.
[0015] Optionally, the airtightness testing device for the sealed container is further provided with a third pipeline, and the pneumatic vacuum generator is further provided with an air inlet. The air inlet is connected to the second end of the third pipeline. A first three-way interface is provided on the first pipeline at a position between the air source and the first solenoid valve. The first end of the first three-way interface is connected to the air source, the second end of the first three-way interface is connected to the first air port of the first solenoid valve, and the third end of the first three-way interface is connected to the first end of the third pipeline.
[0016] By adopting the above technical solution, the gas output from the gas source is used to drive the pneumatic vacuum generator.
[0017] Optionally, a third solenoid valve is provided on the third pipeline. The third solenoid valve has a first air port and a second air port. The first air port is connected to the third end of the first three-way interface, and the second air port is connected to the air inlet. The control module is electrically connected to the third solenoid valve and is used to control the opening and closing of the third solenoid valve to control the operation and shutdown of the pneumatic vacuum generator.
[0018] By adopting the above technical solution, it is convenient to control the operation and shutdown of the pneumatic vacuum generator.
[0019] Optionally, a pressure regulating filter is provided on the first pipeline between the first tee port and the first solenoid valve. The first end of the pressure regulating filter is connected to the second end of the first tee port, and the second end of the pressure regulating filter is connected to the first air port of the first solenoid valve.
[0020] By adopting the above technical solution, the contamination of the sealed container under test is avoided and the gas pressure is stabilized.
[0021] Optionally, a pressure reducing valve is provided on the first pipeline at a position between the pressure regulating filter and the first solenoid valve. The first end of the pressure reducing valve is connected to the second end of the pressure regulating filter, and the second end of the pressure reducing valve is connected to the first air port of the first solenoid valve.
[0022] By adopting the above technical solution, the test sealed container is prevented from breaking due to the pressure of the inflowing gas exceeding the limit of the test sealed container.
[0023] Optionally, a detection port is provided on the first pipeline at the second end of the second tee interface. The first end of the detection port is connected to the second end of the second tee interface, and the second end of the detection port is used to connect to the sealed container under test.
[0024] By adopting the above technical solution, it is convenient to connect the first pipeline and the sealed container under test.
[0025] Optionally, the first end of the detection port and the second end of the detection port have different diameters, with the diameter of the first end of the detection port being larger than the diameter of the second end of the detection port.
[0026] By adopting the above technical solution, the connection between the second end of the detection port and the sealed container under test is more convenient and faster, thus improving the detection efficiency.
[0027] In summary, this application includes at least one of the following beneficial technical effects:
[0028] 1. The components for automatically controlling the inflation rate have been simplified, avoiding pressure fluctuations caused by branch switching;
[0029] 2. Accelerate the exhaust speed to prevent the sealed container from being contaminated by backflowing air from the outside;
[0030] 3. Facilitates the control of the operation and shutdown of the pneumatic vacuum generator;
[0031] 4. Prevent the sealed container under test from being contaminated and stabilize the gas pressure. Attached Figure Description
[0032] Figure 1 This is a schematic diagram of the airtightness testing device for a sealed container according to an embodiment of this application.
[0033] Figure 2 yes Figure 1 Enlarged diagram of area A in the middle.
[0034] Figure 3 yes Figure 1 Enlarged diagram of area B in the middle.
[0035] Explanation of reference numerals in the attached diagram: 10, air source; 20, first pipeline; 21, first tee port; 22, pressure regulating filter; 23, pressure reducing valve; 24, first solenoid valve; 24a, first air port of the first solenoid valve; 24b, second air port of the first solenoid valve; 24c, third air port of the first solenoid valve; 25, second solenoid valve; 25a, first air port of the second solenoid valve; 25b, second air port of the second solenoid valve; 26, pressure sensor; 27, second tee port; 28, detection port; 30, second pipeline; 31, pneumatic vacuum generator; 32, air inlet; 33, negative pressure port; 34, exhaust port; 35, silencer; 40, third pipeline; 41, third solenoid valve; 41a, first air port of the third solenoid valve; 41b, second air port of the third solenoid valve; 50, control module; 60, sealed container under test. Detailed Implementation
[0036] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.
[0037] This application discloses an airtightness testing device for a sealed container. (Refer to...) Figure 1 The airtightness testing device for the sealed container includes an air source 10, a first pipeline 20, a second pipeline 30, a third pipeline 40, and a control module 50. The first end of the first pipeline 20 is connected to the air source 10, and the second end of the first pipeline 20 is connected to the sealed container 60 to be tested. The first end of the second pipeline 30 and the first end of the third pipeline 40 are respectively connected to the first pipeline 20 at a position between the air source 10 and the sealed container 60 to be tested.
[0038] Reference Figure 1 and Figure 2The first pipeline 20 is provided with a first three-way interface 21, a pressure regulating filter 22, a pressure reducing valve 23, a first solenoid valve 24, a second solenoid valve 25, a second three-way interface 27, and a detection port 28 in sequence. The first solenoid valve 24 has a first solenoid valve first air port 24a, a first solenoid valve second air port 24b, and a first solenoid valve third air port 24c. The second solenoid valve 25 has a second solenoid valve first air port 25a and a second solenoid valve second air port 25b.
[0039] The first end of the first three-way interface 21 is connected to the air source 10. The second end of the first three-way interface 21 is connected to the first end of the pressure regulating filter 22. The second end of the pressure regulating filter 22 is connected to the first end of the pressure reducing valve 23. The second end of the pressure reducing valve 23 is connected to the first air port 24a of the first solenoid valve. The second air port 24b of the first solenoid valve is connected to the first air port 25a of the second solenoid valve. The second air port 25b of the second solenoid valve is connected to the first end of the second three-way interface 27. The second end of the second three-way interface 27 is connected to the first end of the detection port 28. A pressure sensor 26 is provided on the third end of the second three-way interface 27. The pressure sensor 26 is used to measure the pressure inside the sealed container 60 under test. The second end of the detection port 28 is connected to the sealed container 60 under test.
[0040] The first end of the second pipeline 30 is connected to the third air port 24c of the first solenoid valve. The second end of the second pipeline 30 is provided with a pneumatic vacuum generator 31. The pneumatic vacuum generator 31 is provided with a negative pressure port 33, an air inlet 32 and an exhaust port 34. The negative pressure port 33 is connected to the third air port 24c of the first solenoid valve through the second pipeline 30. The exhaust port 34 is provided with a silencer 35.
[0041] Reference Figure 1 and Figure 3 The first end of the third pipe 40 is connected to the third end of the first three-way interface 21, and the second end of the third pipe 40 is connected to the air inlet 32. The third pipe 40 is provided with a third solenoid valve 41, which has a first air port 41a and a second air port 41b. The first air port 41a is connected to the third end of the first three-way interface 21, and the second air port 41b is connected to the air inlet 32.
[0042] Refer again Figure 1 The control module 50 is electrically connected to the first solenoid valve 24, the second solenoid valve 25, the third solenoid valve 41 and the pressure sensor 26.
[0043] The operating steps of the airtightness testing device for the sealed container in this embodiment are as follows:
[0044] During the inflation phase: The sealed container 60 under test is connected to the second end of the detection port 28. The control module 50 controls the first solenoid valve's first port 24a and second port 24b to connect, controls the second solenoid valve 25 to open, and controls the third solenoid valve 41 to close. Gas flows into the sealed container 60 under test through the first pipeline 20. When the pressure inside the sealed container 60 is about to reach the pressure required for the pressure holding phase, the control module 50 controls the opening and closing of the second solenoid valve 25 to reduce the rate of gas flow into the sealed container 60 under test, preventing damage due to overfilling. The pressure regulating filter 22 filters the flowing gas and stabilizes its pressure, preventing contamination of the sealed container 60 under test and stabilizing the gas pressure. The pressure reducing valve 23 limits the pressure of the flowing gas, preventing excessive gas pressure from damaging the sealed container 60 under test.
[0045] Pressure holding phase: The control module 50 controls the first solenoid valve 24 and the second solenoid valve 25 to close, and cuts off the gas source 10. The control module 50 sets the pressure holding time according to the type of the sealed container 60 being tested. During the pressure holding time, the control module 50 continuously collects data from the pressure sensor 26. If the pressure data drops beyond a threshold, the airtightness of the sealed container 60 is determined to be unqualified; if the pressure data drops below the threshold, the airtightness of the sealed container 60 is determined to be good.
[0046] Exhaust Phase: The control module 50 controls the second air port 24b of the first solenoid valve to connect with the third air port 24c of the first solenoid valve, controls the second solenoid valve 25 to open, controls the third solenoid valve 41 to open, and connects the gas source 10 to the first end of the first three-way interface 21. Gas flows into the pneumatic vacuum generator 31 through the third solenoid valve 41 to drive the pneumatic vacuum generator 31 to generate a negative pressure relative to the inside of the sealed container 60 under test at the negative pressure port 33, accelerating the outflow of gas from the sealed container 60 under test, and completing the detection cycle.
[0047] The implementation principle of the airtightness detection device for a sealed container in this application embodiment is as follows:
[0048] The components of the airtightness detection device for the sealed container that automatically control the air intake rate are the second solenoid valve 25 located on the first pipeline 20, the pressure sensor 26, and the control module 50. The control module 50 controls the opening and closing of the second solenoid valve 25 based on the reading of the pressure sensor 26 to achieve the effect of controlling the air intake rate. This simplifies the components for automatically controlling the inflation rate, makes the control method simple, reduces the number of parts and makes it less prone to failure, and does not cause pressure fluctuations when switching between multiple branches in a single-path system.
[0049] The second pipeline 30 is equipped with a pneumatic vacuum generator 31. When the pneumatic vacuum generator 31 is working, the negative pressure port 33 generates a negative pressure relative to the sealed container 60 under test, which speeds up the exhaust speed, improves the detection efficiency, and prevents the sealed container 60 under test from being contaminated by the backflow of external air.
[0050] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A device for detecting the airtightness of a sealed container, characterized in that, include: Gas source (10); A first pipeline (20) is connected at its first end to the gas source (10), and at its second end to the sealed container (60) to be tested. The first pipeline is provided with a second solenoid valve (25) and a second three-way interface (27). The second solenoid valve (25) has a first air port (25a) and a second air port (25b). The first air port (25a) of the second solenoid valve is connected to the gas source (10), and the second air port (25b) of the second solenoid valve is connected to the first end of the second three-way interface (27). The second end of the second three-way interface (27) is used to connect to the sealed container (60) to be tested. A pressure sensor (26) is provided on the third end of the second three-way interface (27). The pressure sensor (26) is used to measure the pressure inside the sealed container (60) to be tested. The control module (50) is electrically connected to the pressure sensor (26) and the second solenoid valve (25). The control module (50) is used to detect the airtightness of the sealed container (60) under test according to the change of the reading of the pressure sensor (26), and to adjust the opening and closing of the second solenoid valve (25) according to the reading of the pressure sensor (26) to adjust the inflation rate.
2. The airtightness testing device for a sealed container according to claim 1, characterized in that, It also includes a second pipeline (30) for exhaust; a first solenoid valve (24) is also provided on the first pipeline (20) at a position between the gas source (10) and the second solenoid valve (25). The first solenoid valve (24) has a first solenoid valve first port (24a), a first solenoid valve second port (24b) and a first solenoid valve third port (24c). The first solenoid valve first port (24a) is connected to the gas source (10), the first solenoid valve second port (24b) is connected to the second solenoid valve first port (25a), and the first solenoid valve third port (24c) is connected to one end of the second pipeline (30); the control module (50) is electrically connected to the first solenoid valve (24) to control the first solenoid valve second port (24b) and the first solenoid valve third port (24c) to exhaust the gas in the tested sealed container (60) through the second pipeline (30).
3. The airtightness testing device for a sealed container according to claim 2, characterized in that, A pneumatic vacuum generator (31) is provided on one end of the second pipeline (30) away from the third air port (24c) of the first solenoid valve. The pneumatic vacuum generator (31) is provided with a negative pressure port (33) and an exhaust port (34). The negative pressure port (33) is connected to the third air port (24c) of the first solenoid valve through the second pipeline (30). The pneumatic vacuum generator (31) is used to generate a negative pressure relative to the sealed container (60) under test in order to improve the exhaust efficiency.
4. The airtightness testing device for a sealed container according to claim 3, characterized in that, A muffler (35) is provided on the exhaust port (34).
5. The airtightness testing device for a sealed container according to claim 3, characterized in that, It also includes a third pipeline (40) for connecting the air source (10) and the pneumatic vacuum generator (31); the pneumatic vacuum generator (31) is also provided with an air inlet (32), the air inlet (32) is connected to the second end of the third pipeline (40), and the first pipeline (20) is also provided with a first three-way interface (21) located between the air source (10) and the first solenoid valve (24), the first end of the first three-way interface (21) is connected to the air source (10), the second end of the first three-way interface (21) is connected to the first air port (24a) of the first solenoid valve, and the third end of the first three-way interface is connected to the first end of the third pipeline (40).
6. The airtightness testing device for a sealed container according to claim 5, characterized in that, A third solenoid valve (41) is provided on the third pipeline (40) between the pneumatic vacuum generator (31) and the first three-way interface (21). The third solenoid valve (41) has a first air port (41a) and a second air port (41b). The first air port (41a) is connected to the third end of the first three-way interface (21), and the second air port (41b) is connected to the air inlet (32). The control module (50) is electrically connected to the third solenoid valve (41) and is used to control the opening and closing of the third solenoid valve (41) to control the operation or shutdown of the pneumatic vacuum generator (31).
7. The airtightness testing device for a sealed container according to claim 5, characterized in that, A pressure regulating filter (22) is provided on the first pipeline (20) between the first three-way interface (21) and the first solenoid valve (24). The first end of the pressure regulating filter (22) is connected to the second end of the first three-way interface (21), and the second end of the pressure regulating filter (22) is connected to the first air port (24a) of the first solenoid valve.
8. The airtightness testing device for a sealed container according to claim 7, characterized in that, A pressure reducing valve (23) is also provided on the first pipeline (20) between the pressure regulating filter (22) and the first solenoid valve (24). The first end of the pressure reducing valve (23) is connected to the second end of the pressure regulating filter (22), and the second end of the pressure reducing valve (23) is connected to the first air port (24a) of the first solenoid valve.
9. The airtightness testing device for a sealed container according to claim 8, characterized in that, A detection port (28) is provided on the first pipeline (20) at the second end of the second three-way interface (27). The first end of the detection port (28) is connected to the second end of the second three-way interface (27), and the second end of the detection port (28) is used to connect to the sealed container (60) to be tested.
10. The airtightness testing device for a sealed container according to claim 9, characterized in that, The diameter of the second end of the detection port (28) is smaller than the diameter of the first end of the detection port (28) so as to facilitate connection to the sealed container (60) to be tested.