Semi-automatic positive and negative pressure switching airtightness testing device

Abstract

The application relates to the technical field of detection, in particular to a semi-automatic positive-negative pressure switching airtightness testing device, which comprises a base for placing a product to be tested and a lower pressing sealing module, and the product to be tested is provided with an air inlet and an air outlet; the lower pressing sealing module comprises a motor, a fixing frame and a mounting plate arranged in sequence along the vertical direction, the fixing frame is connected with the motor, the mounting plate is arranged below the fixing frame, the mounting plate is provided with a positive pressure connecting piece, a negative pressure connecting piece and a silica gel profiling sealing block, the silica gel profiling sealing block is located directly above the product to be tested and seals the product to be tested; the bottom ends of the positive pressure connecting piece and the negative pressure connecting piece penetrate through the silica gel profiling sealing block and are respectively communicated with the air inlet and the air outlet of the product to be tested; the top ends of the positive pressure connecting piece and the negative pressure connecting piece are respectively connected with a positive pressure flow control module and a negative pressure flow control module. The application can improve the testing efficiency, reduce the labor input, and improve the standardization and reliability of the testing results under the premise of ensuring the operation safety.

Description

Technical Field

[0001] This application relates to the field of testing technology, and in particular to a semi-automatic positive and negative pressure switching air tightness testing device. Background Technology

[0002] With the increasing demands for product sealing performance in the manufacturing industry, particularly in consumer electronics, automotive parts, and medical devices, airtightness testing, a crucial step in product quality inspection, is gradually transitioning from manual testing to automated and standardized testing. Especially for products with inlet and outlet ports, it is necessary to test for leaks under positive pressure and simulate extreme conditions under negative pressure to comprehensively evaluate their sealing performance. Therefore, airtightness testing devices with dual positive and negative pressure testing capabilities have become an important direction for equipment development in related fields.

[0003] Existing airtightness testing devices mostly use manual methods to switch between positive and negative pressure, that is, by manually changing the test interface or manually adjusting the pipeline control valves. This method is not only cumbersome and inefficient, but also prone to leakage or pipeline damage due to operational errors during frequent switching, affecting the accuracy and consistency of test results. In addition, some existing equipment lacks sufficient pressure control feedback mechanisms in its sealing structure design, which can easily cause overpressure damage to the product under test, especially for products with delicate or fragile structures.

[0004] Therefore, it is necessary to provide a compact, easy-to-operate airtightness testing device with semi-automatic positive and negative pressure switching capability. This device can not only improve testing efficiency and reduce manpower input, but also improve the standardization and reliability of test results while ensuring operational safety, thus better meeting the current demand for efficient and precise testing equipment. Utility Model Content

[0005] To improve testing efficiency, reduce manpower input, and enhance the standardization and reliability of test results while ensuring operational safety, this application provides a semi-automatic positive and negative pressure switching airtightness testing device. The technical solution provided in this application is as follows:

[0006] A semi-automatic positive and negative pressure switching air tightness testing device includes a base for placing the product under test and a downward sealing module. The product under test has an air inlet and an air outlet. The downward sealing module includes a motor, a fixing frame, and a mounting plate arranged vertically in sequence. The fixing frame is connected to the output end of the motor. The mounting plate is located below the fixing frame and has a positive pressure connector, a negative pressure connector, and a silicone contour sealing block. The silicone contour sealing block is located directly above the product under test and seals it. The bottom ends of the positive pressure connector and the negative pressure connector pass through the silicone contour sealing block and are respectively connected to the air inlet and the air outlet of the product under test. The top ends of the positive pressure connector and the negative pressure connector are respectively connected to a positive pressure flow control module and a negative pressure flow control module.

[0007] In one specific implementation, the positive pressure flow control module includes a first air source switch valve, a first air source flow meter, a first low-pressure air gauge, a first high-pressure air gauge, a first high-pressure air source control proportional valve, and a first low-pressure air source control proportional valve arranged sequentially along the positive pressure connector. The first high-pressure air source control proportional valve and the first low-pressure air source control proportional valve are arranged side by side, and the first low-pressure air gauge and the first high-pressure air gauge are arranged side by side.

[0008] In one specific implementation scheme, the end of the first air source flow meter away from the positive pressure connector is connected to a first silicone plug, the end of the first high-pressure gauge near the positive pressure connector is connected to a first high-pressure interface, the end of the first low-pressure gauge near the positive pressure connector is connected to a first low-pressure interface, and the first silicone plug is connected to a first drive cylinder and a first switching cylinder.

[0009] In one specific implementation scheme, the negative pressure flow control module includes a second air source switch valve, a second air source flow meter, a second low-pressure air gauge, a second high-pressure air gauge, a second high-pressure air source control proportional valve, a second low-pressure air source control proportional valve, and a negative pressure generator arranged sequentially along the negative pressure connector. The second high-pressure air source control proportional valve and the second low-pressure air source control proportional valve are arranged side by side, and the second low-pressure air gauge and the second high-pressure air gauge are arranged side by side.

[0010] In one specific implementation scheme, the end of the second air source flow meter away from the negative pressure connector is connected to a second silicone plug, the end of the second high-pressure gauge near the negative pressure connector is connected to a second high-pressure interface, the end of the second low-pressure gauge near the negative pressure connector is connected to a second low-pressure interface, and the second silicone plug is connected to a second drive cylinder and a second switching cylinder.

[0011] In one specific implementation scheme, the bottom end of the fixing frame is connected to an upper connecting plate, the top end of the mounting plate is connected to a lower connecting plate, and the upper connecting plate and the lower connecting plate are connected by horizontal screws at the four corners.

[0012] In one specific implementation, a pressure sensor is provided between the lower connecting plate and the mounting plate.

[0013] In summary, the beneficial effects of this application include at least the following:

[0014] 1) By setting up an electrically controllable downward sealing module, the motor drives the fixing frame to move the sealing assembly vertically, and in conjunction with the silicone contour sealing block, automatic alignment and sealing of the product under test is achieved, avoiding manual tightening operations and improving the consistency and efficiency of the sealing operation. At the same time, by setting up a pressure sensor to monitor the sealing pressure in real time, the product damage caused by excessive tightening force is effectively prevented, improving the safety and stability of the testing process.

[0015] 2) By introducing a sliding cylinder in conjunction with a silicone plug into the positive and negative pressure flow control modules, automatic switching between high-pressure and low-pressure air circuits is achieved. This eliminates the need for traditional manual insertion / removal of air hoses or rotation of valves, enabling rapid switching and automatic control of positive / negative pressure conditions and pressure levels during airtightness testing. This setup enhances the automation of the testing process, shortens operation time, and facilitates efficient testing and standardized management of products with various specifications.

[0016] Automatic sealing and fixing of the product under test is achieved by setting up a vertically movable pressure sealing module. The pressure sealing module integrates a silicone contour sealing block, positive and negative pressure connectors, and a pressure sensor, which can adapt to different product interfaces and monitor sealing pressure to prevent product damage. The device is equipped with positive and negative pressure flow control modules, each containing high-pressure and low-pressure channels. A sliding cylinder drives the silicone plug to automatically switch between high-pressure and low-pressure interfaces, thereby achieving rapid switching between positive and negative pressure test conditions. This solution, combining automatic pressure positioning and electro-pneumatic circuit switching, effectively realizes a semi-automated operation process from sealing and pressurization to switching the test state. It not only saves manpower and improves testing efficiency, but also enhances the flexibility of test pressure level control and the standardization of seal testing.

[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, the preferred embodiments of this application are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the airtightness testing device with semi-automatic positive and negative pressure switching in this embodiment.

[0019] Figure 2 This is a schematic diagram of the structure of the pressure sealing module in this embodiment.

[0020] Reference numerals: 1. Lower pressure sealing module; 11. Motor; 12. Fixing bracket; 13. Upper connecting plate; 14. Lower connecting plate; 15. Mounting plate; 16. Positive pressure connector; 17. Negative pressure connector; 18. Silicone contour sealing block; 2. Positive pressure flow control module; 21. First high-pressure air source control proportional valve; 22. First low-pressure air source control proportional valve; 23. First high-pressure air gauge; 24. First low-pressure air gauge; 25. First silicone plug; 26. First drive cylinder; 27. First switching cylinder; 28. First air source flow meter; 29. ​​First air source switch 1. Valve; 2. Negative pressure flow control module; 31. Second high-pressure air source control proportional valve; 32. Second low-pressure air source control proportional valve; 33. Second high-pressure air gauge; 34. Second low-pressure air gauge; 35. Second silicone plug; 36. Second drive cylinder; 37. Second switching cylinder; 38. Second air source flow meter; 39. Second air source switch valve; 4. Horizontal screw; 5. Pressure sensor; 6. Base; 7. Product under test; 8. Negative pressure generator; 91. First high-pressure interface; 92. First low-pressure interface; 93. Second high-pressure interface; 94. Second low-pressure interface. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0022] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0023] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] This application discloses a semi-automatic positive and negative pressure switching air tightness testing device.

[0026] Reference Figure 1 The semi-automatic positive and negative pressure switching airtightness testing device includes a base 6 for placing the product under test 7 and a downward sealing module 1. The downward sealing module 1 is located directly above the base 6 and the product under test 7. The product under test 7 has an air inlet and an air outlet. Figure 2 The pressure sealing module 1 includes a motor 11, a fixing frame 12, an upper connecting plate 13, a lower connecting plate 14, and a mounting plate 15 arranged vertically in sequence. The fixing frame 12 is fixedly connected to the output end of the motor 11, and the motor 11 drives the fixing frame 12 to move vertically. The bottom end of the fixing frame 12 is fixedly connected to the upper connecting plate 13. The upper connecting plate 13 and the lower connecting plate 14 are connected by horizontal screws 4 at the four corners. The horizontal screws 4 facilitate adjustment of the levelness during sealing. The mounting plate 15 is fixedly connected below the lower connecting plate 14. The mounting plate 15 is provided with a positive pressure connector 16, a negative pressure connector 17, and a silicone contour sealing block 18. The silicone contour sealing block 18 is located at the bottom of the mounting plate 15 and seals the product 7 to be tested. The bottom ends of both the positive pressure connector 16 and the negative pressure connector 17 pass through the silicone contour sealing block 18 and are respectively connected to the air inlet and air outlet of the product under test 7. The top ends of the positive pressure connector 16 and the negative pressure connector 17 are respectively connected to the positive pressure flow control module 2 and the negative pressure flow control module 3. A pressure sensor 5 is provided between the lower connecting plate 14 and the mounting plate 15 to monitor the pressure when the silicone contour sealing block 18 is sealing, preventing damage to the product under test 7.

[0027] It should be noted that in this embodiment, both the positive pressure connector 16 and the negative pressure connector 17 are existing structures composed of a retaining ring and a spring. The spring is used as a clamping element, utilizing its elastic deformation to achieve a tight fit with the interface of the product under test 7, providing a continuous and stable clamping force; while the retaining ring serves as a limiting or fixing structure to prevent axial loosening of the connector after installation. This combined structure ensures sealing while also having the advantages of simple structure, fast response, and convenient installation.

[0028] Reference Figure 1 and Figure 2The positive pressure flow control module 2 includes a first gas source switch valve 29, a first gas source flow meter 28, a first low-pressure gas pressure gauge 24, a first high-pressure gas pressure gauge 23, a first high-pressure gas source control proportional valve 21, and a first low-pressure gas source control proportional valve 22 arranged sequentially along the positive pressure connector 16. The first high-pressure gas source control proportional valve 21 and the first low-pressure gas source control proportional valve 22 are arranged side by side, and the first low-pressure gas pressure gauge 24 and the first high-pressure gas pressure gauge 23 are arranged side by side. A first silicone plug 25, a first driving cylinder 26, and a first switching cylinder 27 are provided between the first air source flow meter 28 and the first low-pressure gauge 24 and the first high-pressure gauge 23 arranged in parallel. Both are slide cylinders. The first driving cylinder 26 is located on the slide of the first switching cylinder 27, and the first silicone plug 25 is located on the slide of the first driving cylinder 26. The end of the first high-pressure gauge 23 near the positive pressure connector 16 is connected to the first high-pressure interface 91, and the end of the first low-pressure gauge 24 near the positive pressure connector 16 is connected to the first low-pressure interface 92. By activating the first switching cylinder 27 and the first driving cylinder 26, the first silicone plug 25 can be driven to selectively connect with the first high-pressure interface 91 or the first low-pressure interface 92, thereby completing the setting of high pressure or low pressure.

[0029] Reference Figure 1 and Figure 2 Similarly, the negative pressure flow control module 3 includes a second air source switch valve 39, a second air source flow meter 38, a second low-pressure air pressure gauge 34, a second high-pressure air pressure gauge 33, a second high-pressure air source control proportional valve 31, a second low-pressure air source control proportional valve 32, and a negative pressure generator 8 arranged sequentially along the negative pressure connector 17. The second high-pressure air source control proportional valve 31 and the second low-pressure air source control proportional valve 32 are arranged side by side, and the second low-pressure air pressure gauge 34 and the second high-pressure air pressure gauge 33 are arranged side by side. A second silicone plug 35, a second drive cylinder 36, and a second switching cylinder 37 are provided between the second air source flow meter 38 and the second low-pressure gauge 34 and the second high-pressure gauge 33 arranged in parallel. Both are slide cylinders. The second drive cylinder 36 is located on the slide of the second switching cylinder 37, and the second silicone plug 35 is located on the slide of the second drive cylinder 36. The end of the second high-pressure gauge 33 near the negative pressure connector 17 is connected to the second high-pressure interface 93, and the end of the second low-pressure gauge 34 near the negative pressure connector 17 is connected to the second low-pressure interface 94. By activating the second switching cylinder 37 and the second drive cylinder 36, the second silicone plug 35 can be driven to selectively connect with the second high-pressure interface 93 or the second low-pressure interface 94, thereby completing the setting of high or low pressure.

[0030] It should be noted that in this application, positive and negative pressure testing is not limited to a single pressure level, but includes different pressure difference levels to adapt to the testing needs of different products. Therefore, under positive pressure conditions, there may be low positive pressure tests and high positive pressure tests, and under negative pressure conditions, there may be shallow negative pressure tests and deep negative pressure (high vacuum) tests, thereby achieving a more refined and standardized evaluation of sealing performance.

[0031] In summary, the automatic sealing and fixing of the product under test 7 is achieved by setting up a vertically movable pressure sealing module 1. The pressure sealing module 1 integrates a silicone contour sealing block 18, a positive and negative pressure connector 17, and a pressure sensor 5, which can adapt to different product interfaces and monitor sealing pressure to prevent damage to the product. The device is equipped with a positive pressure flow control module 2 and a negative pressure flow control module 3, each containing high-pressure and low-pressure pathways. A sliding cylinder drives the silicone sealing block to automatically switch between high-pressure and low-pressure interfaces, thereby achieving rapid switching between positive and negative pressure test conditions. This solution, combining automatic pressure positioning and electro-pneumatic circuit switching, effectively realizes a semi-automated operation process from sealing and pressurization to switching the test state. This not only saves manpower and improves testing efficiency but also enhances the flexibility of test pressure level control and the standardization of sealing testing.

[0032] 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 semi-automatic positive and negative pressure switching airtightness testing device, characterized in that, The device includes a base for placing the product under test and a pressure sealing module. The product under test has an air inlet and an air outlet. The pressure sealing module includes a motor, a fixing frame, and a mounting plate arranged vertically. The fixing frame is connected to the output end of the motor. The mounting plate is located below the fixing frame and has a positive pressure connector, a negative pressure connector, and a silicone contour sealing block. The silicone contour sealing block is located directly above the product under test and seals it. The bottom ends of the positive pressure connector and the negative pressure connector pass through the silicone contour sealing block and are respectively connected to the air inlet and the air outlet of the product under test. The top ends of the positive pressure connector and the negative pressure connector are respectively connected to a positive pressure flow control module and a negative pressure flow control module.

2. The semi-automatic positive and negative pressure switching airtightness testing device according to claim 1, characterized in that, The positive pressure flow control module includes a first gas source switch valve, a first gas source flow meter, a first low-pressure gas gauge, a first high-pressure gas gauge, a first high-pressure gas source control proportional valve, and a first low-pressure gas source control proportional valve arranged sequentially along the positive pressure connector. The first high-pressure gas source control proportional valve and the first low-pressure gas source control proportional valve are arranged side by side, and the first low-pressure gas gauge and the first high-pressure gas gauge are arranged side by side.

3. The semi-automatic positive and negative pressure switching airtightness testing device according to claim 2, characterized in that, The first air source flow meter has a first silicone plug connected to the end away from the positive pressure connector, the first high pressure gauge has a first high pressure interface connected to the end near the positive pressure connector, the first low pressure gauge has a first low pressure interface connected to the end near the positive pressure connector, and the first silicone plug is connected to a first drive cylinder and a first switching cylinder.

4. The semi-automatic positive and negative pressure switching airtightness testing device according to claim 1, characterized in that, The negative pressure flow control module includes a second air source switch valve, a second air source flow meter, a second low-pressure air gauge, a second high-pressure air gauge, a second high-pressure air source control proportional valve, a second low-pressure air source control proportional valve, and a negative pressure generator arranged sequentially along the negative pressure connector. The second high-pressure air source control proportional valve and the second low-pressure air source control proportional valve are arranged side by side, and the second low-pressure air gauge and the second high-pressure air gauge are arranged side by side.

5. The semi-automatic positive and negative pressure switching airtightness testing device according to claim 4, characterized in that, The second air source flow meter is connected to a second silicone plug at the end away from the negative pressure connector, the second high pressure gauge is connected to a second high pressure interface at the end near the negative pressure connector, the second low pressure gauge is connected to a second low pressure interface at the end near the negative pressure connector, and the second silicone plug is connected to a second drive cylinder and a second switching cylinder.

6. The semi-automatic positive and negative pressure switching airtightness testing device according to claim 1, characterized in that, The bottom of the fixing frame is connected to an upper connecting plate, and the top of the mounting plate is connected to a lower connecting plate. The upper connecting plate and the lower connecting plate are connected by horizontal screws at the four corners.

7. The semi-automatic positive and negative pressure switching airtightness testing device according to claim 6, characterized in that, A pressure sensor is provided between the lower connecting plate and the mounting plate.

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