An air tightness detection apparatus
By filling the product with positive pressure and drawing negative pressure from the outside in the airtightness testing equipment, and using the negative pressure test chamber to detect whether the product is leaking, the problems of easy error, low efficiency and poor accuracy of manual observation in the existing technology are solved, and efficient and accurate airtightness testing is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WEIFANG PARKER HANNIFIN FILTRATION PROD & SYST CO LTD
- Filing Date
- 2025-06-18
- Publication Date
- 2026-06-05
AI Technical Summary
Existing airtightness testing methods rely on manual observation, which is prone to errors, has low testing efficiency, is affected by the external environment, has poor accuracy, and cannot avoid product damage.
An airtightness testing device is used to detect whether the product is leaking by filling the product with positive pressure and drawing negative pressure into the external negative pressure test chamber, and observing the pressure change in the negative pressure test chamber. The negative pressure test chamber, which is formed by the sealing cover and the test box, avoids interference from the external environment.
It improves the accuracy and efficiency of testing, provides intuitive test results, avoids damage to products, and is unaffected by the external environment.
Smart Images
Figure CN224327864U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of airtightness testing technology, and specifically to an airtightness testing device. Background Technology
[0002] Currently, the main methods used in factories to test the airtightness of products are water testing and differential pressure testing. Water testing has the following drawbacks:
[0003] 1. Relying on human visual observation, defective products are more likely to be leaked when the person is fatigued;
[0004] 2. If there is water on the product surface after testing, it needs to be air-dried or oven-dried, as there is a risk of alkali return.
[0005] 3. Each testing device requires a worker to observe it, resulting in low testing efficiency.
[0006] Differential pressure testing involves pressurizing the product by filling it with air and observing the pressure value to check its airtightness. However, differential pressure testing has the following drawbacks:
[0007] 1. If internal components of the product absorb some gas, or if the thin outer shell of the product undergoes slight deformation, the accuracy of the test will be affected.
[0008] 2. Changes in external temperature can lead to inaccurate test results.
[0009] For the reasons mentioned above, there is an urgent need to develop a new airtightness testing device. Utility Model Content
[0010] In view of the above-mentioned defects in the existing technology, the present invention aims to provide an airtightness testing device with high testing accuracy and efficiency, low production cost, and no damage to the product.
[0011] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0012] An airtightness testing device includes a frame, a test chamber and a first drive mechanism mounted on the frame, and a sealing cover mounted on the first drive mechanism; a product positioning seat is provided inside the test chamber; an inflation device is provided on the side wall of the test chamber, and a sealing structure is provided between the inflation device and the test chamber; the product positioning seat is used to position the product, the inflation device is used to connect an external air source and the inner cavity of the product, the first drive mechanism is used to drive the sealing cover to move vertically in a reciprocating linear motion, and the sealing cover, together with the test chamber, forms a sealed negative pressure test chamber that is connected to a pressure testing device.
[0013] The product positioning seat is fixedly installed inside the test box, and the product positioning seat has a contour positioning groove adapted to the product.
[0014] The inflation device is provided in two sets, and the two inflation devices are arranged symmetrically.
[0015] The inflation device includes an air nozzle and a second drive mechanism for driving the air nozzle to move horizontally and reciprocally in a linear motion. The second drive mechanism is disposed on the side wall of the test chamber and located outside the test chamber. The air nozzle is slidably disposed on the side wall of the test chamber, and the air inlet of the air nozzle is located outside the test chamber and connected to the air source. The air outlet of the air nozzle is located inside the test chamber and is used to communicate with the inner cavity of the product. The sealing structure is disposed between the air nozzle and the test chamber.
[0016] The first driving mechanism includes a vertical moving drive component and a guide seat disposed on the vertical moving drive component. The frame includes a base and a support base. Multiple support guide columns are vertically disposed between the base and the support base. The vertical moving drive component is disposed on the support base. The guide seat is slidably disposed on the support guide columns. The sealing cover is disposed on the guide seat.
[0017] The frame is equipped with a third drive mechanism for driving the test box to move horizontally and reciprocally in a linear motion. The test box is mounted on the third drive mechanism and moves to below the sealing cover under the drive of the third drive mechanism.
[0018] The third drive mechanism includes a horizontal movement drive component and a mounting base disposed on the horizontal movement drive component, and the test box is disposed on the mounting base.
[0019] A horizontal moving guide structure is provided between the frame and the mounting base.
[0020] The horizontal movement guide structure includes two slide rails, which are mounted on the frame and symmetrically arranged on both sides of the horizontal movement drive component. The mounting base is fixed on the slider of the two slide rails.
[0021] The airtightness testing device also includes a filling block, which is placed inside the test chamber to reduce the volume of the negative pressure test chamber.
[0022] By adopting the above technical solution, the beneficial effects of this utility model are:
[0023] The airtightness testing device provided by this utility model does not directly test the internal air pressure changes of the product. Instead, it detects whether the product leaks by filling the product with positive pressure and simultaneously drawing negative pressure into a negative pressure testing chamber outside the product, observing the air pressure changes in the negative pressure testing chamber. During testing, the product is first positioned using a product positioning seat. Then, the sealing cover and the test box are fastened together to form a sealed negative pressure testing chamber. A positive pressure is then filled into the product using an inflation device, while a negative pressure is drawn into the negative pressure testing chamber using a pressure testing device. The pressure value change within the negative pressure testing chamber is detected by the pressure testing device. If the air pressure value is within a preset pressure range, the product does not leak; if the air pressure value is outside the preset pressure range, the product leaks. Compared with existing technologies, this airtightness testing device, because the product is not affected by the external environment within the negative pressure testing chamber, makes even small changes in pressure more apparent, resulting in higher detection accuracy and more intuitive and clear test results. Furthermore, the testing process of this airtightness testing device is convenient and quick, with higher work efficiency, and it does not damage the product. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the structure of one embodiment of the airtightness testing device of this utility model;
[0025] Figure 2 yes Figure 1 A schematic diagram of the middle section structure;
[0026] Figure 3 yes Figure 2 Schematic diagram of the structure of the test chamber;
[0027] In the diagram: 1. Frame; 11. Base; 12. Support seat; 13. Support guide column; 2. Test box; 3. First drive mechanism; 31. Vertical movement drive component; 32. Guide seat; 4. Sealing cover; 5. Product positioning seat; 51. Contouring positioning groove; 6. Inflation device; 61. Air nozzle; 62. Second drive mechanism; 63. Mounting bracket; 64. Sealing sleeve; 7. Third drive mechanism; 71. Horizontal movement drive component; 72. Mounting seat; 73. Slide rail. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and are not intended to limit this utility model.
[0029] like Figures 1 to 3As shown, this embodiment discloses an airtightness testing device, including a frame 1, a test chamber 2 and a first drive mechanism 3 mounted on the frame 1, and a sealing cover 4 mounted on the first drive mechanism 3; a product positioning seat 5 is provided inside the test chamber 2; an inflation device 6 is provided on the side wall of the test chamber 2, and a sealing structure is provided between the inflation device 6 and the test chamber 2; the product positioning seat 5 is used to position the product (not shown in the figure), the inflation device 6 is used to connect the external air source and the inner cavity of the product, the first drive mechanism 3 is used to drive the sealing cover 4 to move vertically in a reciprocating linear motion, and the sealing cover 4 is used to form a sealed negative pressure test chamber together with the test chamber 2 and connected to a pressure testing device (not shown in the figure).
[0030] The airtightness testing device in this embodiment does not directly test the internal air pressure change of the product. Instead, it detects whether the product is leaking by filling the product with positive pressure and simultaneously drawing negative pressure into the negative pressure test chamber outside the product and observing the air pressure change in the negative pressure test chamber. Since the product is not affected by the external environment inside the negative pressure test chamber, even small changes in pressure are more obvious. Therefore, the detection accuracy is higher and the detection results are more intuitive and clear. At the same time, the detection process of this airtightness testing device is convenient and quick, with higher work efficiency, and will not damage the product.
[0031] In this embodiment, the product positioning seat 5 is fixedly installed inside the test box 2, and the product positioning seat 5 has a contour positioning groove 51 that matches the product. By setting the contour positioning groove 51 that matches the shape of the product, the multi-degree-of-freedom constraint of the product is realized, thereby improving the positioning accuracy and stability of the product.
[0032] In this embodiment, the product is a filter, and the filter has two sets of oil inlet and return systems. Therefore, in order to improve the inflation efficiency, this embodiment preferably has two sets of inflation devices 6, which are arranged symmetrically. In practical applications, the number of inflation devices 6 can be set according to the structure of the product, and this embodiment does not limit this.
[0033] The inflation device 6 in this embodiment includes an air nozzle 61 and a second drive mechanism 62 for driving the air nozzle 61 to move horizontally and reciprocally in a linear motion. The second drive mechanism 62 is disposed on the side wall of the test chamber 2 and located outside the test chamber 2. The air nozzle 61 is slidably disposed on the side wall of the test chamber 2, with its air inlet located outside the test chamber 2 and connected to an air source, and its air outlet located inside the test chamber 2 for communication with the inner cavity of the product. A sealing structure is disposed between the air nozzle 61 and the test chamber 2. By driving the air nozzle 61 to move horizontally and reciprocally in a linear motion through the second drive mechanism 62, the device can avoid the product during product positioning and ensure a tight connection between the air nozzle 61 and the product after the product is positioned, guaranteeing no air leakage at the connection point between the air nozzle 61 and the product.
[0034] Specifically, a mounting bracket 63 is provided on the side wall of the test chamber 2, and a second drive mechanism 62 is provided on the mounting bracket 63. In this embodiment, the second drive mechanism 62 is preferably a cylinder, and the nozzle 61 is installed on the piston rod of the cylinder. In order to further improve the airtightness of the nozzle 61 at the product interface, a sealing sleeve 64 is provided on the nozzle 61 in this embodiment. At the same time, in this embodiment, the sealing structure between the nozzle 61 and the test chamber 2 adopts a sealing ring (not shown in the figure). The sealing ring is sleeved on the nozzle 61 or fixed in the hole in the test chamber 2 through which the nozzle 61 passes.
[0035] In this embodiment, the first driving mechanism 3 includes a vertical moving drive component 31 and a guide seat 32 disposed on the vertical moving drive component 31. The frame 1 includes a base 11 and a support base 12. Multiple support guide columns 13 are vertically arranged between the base 11 and the support base 12. The vertical moving drive component 31 is disposed on the support base 12, and the guide seat 32 is slidably disposed on the support guide columns 13. The sealing cover 4 is disposed on the guide seat 32. Through the cooperation of the support guide columns 13 and the guide seat 32, the linearity of the vertical movement of the sealing cover 4 is improved, ensuring the accuracy of the sealing cover 4 and the test box 2 engaging.
[0036] To further improve the linearity and stability of the vertical movement of the sealing cover 4, in this embodiment, two vertical movement drive components 31 are preferably provided, and both vertical movement drive components 31 are preferably cylinders. The cylinder bodies of the two cylinders are fixedly mounted on the support base 12, and the piston rods of the two cylinders pass through the support base 12 and are connected to the guide seat 32.
[0037] In this embodiment, sealing rings (not shown in the figure) are provided on both the side where the test chamber 2 is fastened to the sealing cover 4 and the side where the sealing cover 4 is fastened to the test chamber 2. When the test chamber 2 and the sealing cover 4 are fastened together, the two sealing rings are arranged in an inner and outer ring configuration. This arrangement further improves the sealing performance of the negative pressure test chamber.
[0038] To improve the level of automation, this embodiment provides a third drive mechanism 7 on the frame 1 for driving the test box 2 to move horizontally and reciprocally in a linear motion. The test box 2 is mounted on the third drive mechanism 7 and moves to below the sealing cover 4 under the drive of the third drive mechanism 7.
[0039] Specifically, the third drive mechanism 7 includes a horizontal movement drive component 71 and a mounting base 72 disposed on the horizontal movement drive component 71. The horizontal movement drive component 71 is disposed on the support base 12, and the test box 2 is disposed on the mounting base 72. In this embodiment, the horizontal movement drive component 71 is preferably a pneumatic slide, but an electric cylinder can also be used. The specific choice depends on the actual needs, and this embodiment does not impose any restrictions on this.
[0040] To improve the linearity and stability of the horizontal movement of the test chamber 2, a horizontal movement guide structure is provided between the frame 1 and the mounting base 72 in this embodiment.
[0041] Specifically, the horizontal movement guide structure includes two slide rails 73, which are mounted on the support base 12 of the frame 1 and symmetrically arranged on both sides of the horizontal movement drive 71. The mounting base 72 is fixed on the slider of the two slide rails 73.
[0042] The airtightness testing device in this embodiment also includes a filling block (not shown in the figure), which is placed inside the test chamber 2 to reduce the volume of the negative pressure test chamber. This arrangement further improves testing efficiency.
[0043] During testing, the product is first positioned using the product positioning seat 5. Then, the sealing cover 4 is fastened to the test chamber 2 to form a sealed negative pressure test chamber. The product is then pressurized with positive pressure using the inflation device 6, while the negative pressure test chamber is depressurized using a pressure testing device (such as an airtightness tester). The pressure test device detects the change in air pressure within the negative pressure test chamber. If the air pressure is within the preset pressure range, the product does not leak. If the air pressure is outside the preset pressure range, the product leaks.
[0044] The above describes a preferred embodiment of the airtightness testing device of this utility model. There are many other embodiments, which will not be elaborated here.
[0045] In summary, the airtightness testing device provided by this utility model does not directly test the internal air pressure changes of the product. Instead, it detects whether the product is leaking by filling the product with positive pressure and simultaneously drawing negative pressure into the negative pressure testing chamber outside the product and observing the air pressure changes in the negative pressure testing chamber. Since the product is not affected by the external environment inside the negative pressure testing chamber, even small changes in pressure are more noticeable, resulting in higher detection accuracy and more intuitive and clear test results. At the same time, the testing process of this airtightness testing device is convenient and quick, with higher work efficiency, and will not damage the product.
[0046] This utility model is not limited to the specific embodiments described above. Any modifications made by those skilled in the art based on the above concept without creative effort shall fall within the protection scope of this utility model.
Claims
1. An airtightness testing device, characterized in that, The device includes a frame, a test chamber and a first drive mechanism mounted on the frame, and a sealing cover mounted on the first drive mechanism; a product positioning seat is provided inside the test chamber; an inflation device is provided on the side wall of the test chamber, and a sealing structure is provided between the inflation device and the test chamber. The product positioning seat is used to position the product, the inflation device is used to connect the external air source and the inner cavity of the product, the first driving mechanism is used to drive the sealing cover to move vertically and reciprocally in a straight line, and the sealing cover is used to form a sealed negative pressure test chamber together with the test box and connected to the pressure testing device.
2. The airtightness testing device according to claim 1, characterized in that, The product positioning seat is fixedly installed inside the test box, and the product positioning seat has a contour positioning groove adapted to the product.
3. The airtightness testing device according to claim 1, characterized in that, The inflation device is provided in two sets, and the two inflation devices are arranged symmetrically.
4. The airtightness testing device according to claim 3, characterized in that, The inflation device includes an air nozzle and a second drive mechanism for driving the air nozzle to move horizontally and reciprocally in a linear motion. The second drive mechanism is disposed on the side wall of the test chamber and located outside the test chamber. The air nozzle is slidably disposed on the side wall of the test chamber, and the air inlet of the air nozzle is located outside the test chamber and connected to the air source. The air outlet of the air nozzle is located inside the test chamber and is used to communicate with the inner cavity of the product. The sealing structure is disposed between the air nozzle and the test chamber.
5. The airtightness testing device according to claim 1, characterized in that, The first driving mechanism includes a vertical moving drive component and a guide seat disposed on the vertical moving drive component. The frame includes a base and a support base. Multiple support guide columns are vertically disposed between the base and the support base. The vertical moving drive component is disposed on the support base. The guide seat is slidably disposed on the support guide columns. The sealing cover is disposed on the guide seat.
6. The airtightness testing device according to claim 1, characterized in that, The frame is provided with a third drive mechanism for driving the test box to move horizontally and reciprocally in a linear motion. The test box is mounted on the third drive mechanism and moves to below the sealing cover under the drive of the third drive mechanism.
7. The airtightness testing device according to claim 6, characterized in that, The third drive mechanism includes a horizontal movement drive component and a mounting base disposed on the horizontal movement drive component, and the test box is disposed on the mounting base.
8. The airtightness testing device according to claim 7, characterized in that, A horizontal moving guide structure is provided between the frame and the mounting base.
9. The airtightness testing device according to claim 8, characterized in that, The horizontal movement guide structure includes two slide rails, which are mounted on the frame and symmetrically arranged on both sides of the horizontal movement drive component. The mounting base is fixed on the slider of the two slide rails.
10. The airtightness testing device according to claim 1, characterized in that, The airtightness testing device also includes a filling block, which is placed inside the test chamber to reduce the volume of the negative pressure test chamber.