A sealing detection device for an oil filter

Abstract

The present application relates to filter sealing detection technical field, specifically for a kind of sealing detection equipment for oil filter, including leak detection container and gland assembly, leak detection container is suitable for containing detection water, gland assembly includes lid and piston column, the bottom of lid has the positioning groove capable of accommodating the shell of oil filter, several location cavities of long strip shape extending towards the axis of lid are provided on the lid around positioning groove, the lower end of location cavity is open structure, and it is adjacent to the weld of the shell of oil filter and threaded cover plate setting, piston cavity is also provided on lid, piston head and sealing ring are provided on piston column.The present application is by being set in multiple location cavities around weld on lid, water column is formed in location cavity using the movement of piston column, bubble generated at weld is collected by location cavity, bubble will make water column height change, to accurately judge weld leakage point, provide convenience for subsequent oil filter repair work.

Description

Technical Field

[0001] This invention relates to the field of filter sealing testing technology, specifically to a sealing testing device for oil filters. Background Technology

[0002] Currently, the leak detection method is commonly used to test the sealing performance of oil filters. The specific procedure is as follows: The oil filter's inlet and outlet are turned downwards or blocked, and the filter is submerged in water. Observe whether air bubbles escape from the circular weld between the outer casing and the threaded cover. The presence of air bubbles indicates a leak.

[0003] To facilitate leak location, existing testing procedures typically involve placing the oil filter horizontally in water and observing bubble formation in different areas of the weld by rotating the filter. However, due to the high fluidity of water, bubbles rise unpredictably, easily drifting, dispersing, or adhering to the workpiece surface, making it difficult for operators to accurately determine the exact starting position of the bubbles visually. Therefore, existing testing equipment cannot accurately identify the location of leaks, resulting in a lack of targeted repair work, operational inconvenience, and impacted testing efficiency and repair quality. To address these issues, this invention proposes a leak detection device for oil filters. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sealing test device for oil filters that can accurately locate weld leaks and facilitate subsequent oil filter repair work.

[0005] This invention is achieved through the following technical solution: Option 1: A leak detection device for oil filter sealing is provided, comprising a leak detection container and a cap assembly. The leak detection container is suitable for holding test water. The cap assembly includes a cap body and a piston rod. The bottom of the cap body has a positioning groove capable of accommodating the oil filter housing. Several elongated indicator cavities extending axially toward the cap body are provided on the cap body around the positioning groove. The lower end of each indicator cavity is an open structure and is located adjacent to the weld between the oil filter housing and the threaded cover plate. A piston cavity is also provided on the cap body. A piston head and a sealing ring are provided on the piston rod. The piston rod is dynamically sealed to the piston cavity through the piston head. The piston head divides the piston cavity into a first cavity and a second cavity. The upper end of each indicator cavity is connected to the first cavity through a connecting part. The sealing ring is located in the first cavity and corresponds to the position of the connecting part.

[0006] Option 2: Based on Option 1, the sealing performance testing device further includes a pressurizing component, which includes a pressurizing piston, a first elastic element, a second elastic element, and a first venting section. The sealing ring is elastically disposed on the piston rod or the piston head via the first elastic element. The communicating portion is provided with a limiting portion for restricting the movement of the sealing ring. The pressurizing piston is elastically disposed on the second cavity via the second elastic element, and the pressurizing piston divides the second cavity into a middle cavity and a pressurizing cavity. The first venting section is configured to sequentially connect the middle cavity to the outside of the piston cavity and the pressurizing cavity to the inside of the oil filter during the movement of the piston head along the piston cavity.

[0007] Option 3: Based on Option 2, a connecting rod is fixed to the piston head. The connecting rod movably passes through the sealing ring. Limiting end plates and limiting bosses are fixed on the connecting rods located on both sides of the sealing ring, respectively. The first elastic element is a compression spring that is movably sleeved outside the connecting rod and located between the limiting end plate and the sealing ring.

[0008] Option 4: Based on Option 2, the first exhaust section includes a first U-shaped channel, a first sealing sleeve, a spring tube, and a vent hole. The first sealing sleeve is fixed on the cover, with one end open and the other end closed. The closed end of the first sealing sleeve is connected to the oil filter through the spring tube. One end of the first U-shaped channel is connected to the second cavity, and the other end is aligned with the open end of the first sealing sleeve. The vent hole is located on the pressurizing piston at a position corresponding to the first U-shaped channel.

[0009] Option 5: Based on Option 2, the second elastic element is a compression spring disposed between the pressurizing piston and the cover.

[0010] Option 6: Based on any one of Options 2 to 5, the pressurizing component further includes a second exhaust section, which is configured to connect the first cavity with the outside of the piston cavity during the synchronous movement of the pressurizing piston along the piston cavity with the piston head.

[0011] Option 7: Based on Option 6, the second exhaust section includes a second U-shaped channel and a second sealing sleeve. The second sealing sleeve is fixed on the piston rod and has an opening at one end. One end of the second U-shaped channel is connected to the first cavity, and the other end is aligned with the opening of the second sealing sleeve.

[0012] Option 8: Based on Option 2, the limiting part is a boss structure protruding from the inner wall of the piston cavity, the connecting part is disposed on the boss structure, and the sealing ring and the boss structure seal the connecting part by surface-to-surface compression.

[0013] Option 9: Based on Option 1, the lower end of the positioning cavity is configured as a tapered flare.

[0014] Option 10: Based on Option 1, the sealing test equipment for the oil filter further includes a frame, the leak detection container is located at the bottom of the frame, and a drive device is fixed at the top of the frame. The drive device is used to drive the piston rod to move relative to the cover.

[0015] Compared with the prior art, the present invention provides a sealing performance testing device for oil filters, which has the following advantages: This invention sets multiple indicator cavities around the weld seam on the cover body. The movement of the piston rod forms a water column in the indicator cavity. The indicator cavity collects the air bubbles generated at the weld seam. The air bubbles cause the water column height to change, thereby accurately determining the weld seam leakage point and facilitating the subsequent repair work of the oil filter. This invention, by setting up a pressurizing component that cooperates with the piston column, only needs to control the movement of the piston column along the piston chamber to form a water column in the indicator chamber and immediately pressurize the inside of the oil filter, thereby completing these two steps in an orderly manner, which has the advantage of low control difficulty; By providing a second exhaust section, the present invention allows external air to be drawn into the first cavity during the synchronous movement of the pressurized piston and piston head along the piston cavity, maintaining a constant air pressure in the first cavity and preventing the movement of the piston rod and piston head from being hindered by a decrease in air pressure in the first cavity. This invention sets the lower end of the positioning cavity as a tapered flare, making it easier for air bubbles generated from the weld to enter the positioning cavity, thereby more accurately determining the leak point. Attached Figure Description

[0016] Figure 1 A three-dimensional structural diagram of a device for testing the sealing performance of oil filters; Figure 2 A schematic front cross-sectional view of a device used for testing the sealing performance of oil filters; Figure 3 for Figure 2 A schematic diagram of a partial structure; Figure 4 for Figure 3 A magnified structural diagram at point A; Figure 5 This is a structural schematic diagram of the cover and the limiting part.

[0017] In the diagram: 100, Leak detection container; 110, Rubber base; 200, Cover; 210, Positioning groove; 220, Indicator cavity; 221, Conical flare; 230, Piston cavity; 231, First cavity; 232, Second cavity; 2320, Mid-position cavity; 2321, Pressurization cavity; 240, Connecting part; 241, Restricting part; 300, Piston column; 310, Piston head; 320, Sealing ring; 330, Connecting rod; 331, Limiting end Plate; 332, Limiting boss; 400, Pressurizing piston; 410, First elastic element; 420, Second elastic element; 430, First exhaust section; 431, First U-shaped channel; 432, First sealing sleeve; 433, Vent hole; 434, Spring tube; 440, Second exhaust section; 441, Second U-shaped channel; 442, Second sealing sleeve; 500, Frame; 600, Drive unit; 700, Oil filter; 710, Weld. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] As described in the background section, currently, during the inspection of oil filters, to facilitate the location of leaks, the oil filter is typically placed horizontally in water, and the air bubble formation in different areas of the weld is observed from different angles by rotating the filter. However, due to the strong fluidity of water, the trajectory of air bubbles as they rise is unstable, easily deviating, dispersing, or adhering to the workpiece surface, making it difficult for operators to accurately determine the exact starting position of the bubbles with the naked eye. Therefore, existing inspection equipment has the problem of not being able to accurately identify the location of air bubble leaks, which in turn makes subsequent repair work lack focus, inconvenient to operate, and affects inspection efficiency and repair quality.

[0020] To address the above issues, please refer to the following implementation example: Figures 1 to 5According to an embodiment of the present invention, a leak detection device for an oil filter is provided, mainly comprising a leak detection container 100 and a cap assembly. The leak detection container 100 is suitable for holding test water. The cap assembly includes a cap body 200 and a piston rod 300. The bottom of the cap body 200 has a positioning groove 210 capable of accommodating the housing of an oil filter 700. Several elongated indicator cavities 220 extending axially toward the cap body 200 are provided on the cap body 200 surrounding the positioning groove 210. The lower end of the indicator cavity 220 is an open structure and adjacent to the oil filter. The outer shell of the device 700 is welded to the threaded cover plate with a weld 710. The cover 200 is also provided with a piston chamber 230. The piston column 300 is provided with a piston head 310 and a sealing ring 320. The piston column 300 is dynamically sealed to the piston chamber 230 through the piston head 310. The piston head 310 divides the piston chamber 230 into a first chamber 231 and a second chamber 232. The upper end of the position indicator chamber 220 is connected to the first chamber 231 through a connecting part 240. The sealing ring 320 is located in the first chamber 231 and corresponds to the position of the connecting part 240.

[0021] Using the above scheme, multiple indicator cavities 220 are set around the weld 710 on the cover 200. The movement of the piston rod 300 creates a water column within the indicator cavities 220. The indicator cavities 220 collect air bubbles generated at the weld 710, causing changes in the water column height, thus accurately determining the leak point at the weld 710 and facilitating subsequent repair work on the oil filter 700. In specific operation: the inlet and outlet of the oil filter 700 to be tested are placed vertically downwards in the leak detection container 100, ensuring that the weld 710 between the oil filter 700 housing and the threaded cover plate is submerged. Simultaneously, the lower opening of the indicator cavity 220 must also be submerged. Then, the piston rod 300 can be manually driven downwards along the piston cavity 230, causing the piston head 310 and the sealing ring 320 to move accordingly. During this process, the space in the first cavity 231 increases and the air pressure decreases. Water in the leak detection container 100 enters the cavity from the lower opening of the indicator cavity 220, forming a water column until the sealing ring 320 blocks the connecting part 240. At this time, the water columns in the multiple indicator cavities 220 are stable at the same height. If an air bubble appears at the weld 710, because the lower opening of the indicator cavity 220 is located near the weld 710, the air bubble only needs to move upward a short distance under the action of buoyancy to enter the upper indicator cavity 220. After the air bubble enters the indicator cavity 220, the water column height will decrease. The operator can more accurately determine the location of the air bubble based on the change in water column height, thus facilitating subsequent repair work on the oil filter 700.

[0022] In the above scheme, since the oil filter 700 typically needs to withstand high pressure during actual use, to make the seal test more consistent with actual working conditions, it can be performed by pressurizing the oil filter 700. Common pressurization methods include pressurizing through an external air pump or other pressurizing equipment. However, this method has the following drawbacks: The timing of pressurization is difficult to control. Specifically, the formation of the water column in the indicator chamber 220 and the pressurization of the oil filter 700 must be completed sequentially and cannot be synchronized, making it difficult to control the opening and closing timing of the pressurizing equipment. Therefore, if... Figure 3 and Figure 4As shown, in some embodiments, the sealing performance testing device further includes a pressurizing component, which includes a pressurizing piston 400, a first elastic element 410, a second elastic element 420, and a first venting part 430. The sealing ring 320 is elastically disposed on the piston rod 300 or the piston head 310 via the first elastic element 410. The communicating part 240 is provided with a limiting part 241 for limiting the movement of the sealing ring 320. The pressurizing piston 400 is elastically disposed on the second cavity 232 via the second elastic element 420. The pressurizing piston 400 divides the second cavity 232 into a middle cavity 2320 and a pressurizing cavity 2321. The pressurizing piston 400 and the inner wall of the piston cavity 230 are dynamically sealed together. The first venting part 430 is configured to sequentially connect the middle cavity 2320 to the outside of the piston cavity 230 and the pressurizing cavity 2321 to the inside of the oil filter 700 during the movement of the piston head 310 along the piston cavity 230. By setting up a pressurizing component that cooperates with the piston rod 300, it is only necessary to control the movement of the piston rod 300 along the piston chamber 230 to immediately pressurize the oil filter 700 after a water column is formed in the position indicator chamber 220, thus completing these two steps in an orderly manner, which has the advantage of low control difficulty. Specifically, the movement of the piston rod 300 along the piston chamber 230 is divided into two stages. In the first stage of the movement of the piston rod 300, the air pressure in the first chamber 231 gradually decreases, and a water column gradually forms in the position indicator chamber 220 until the sealing ring 320 blocks the connecting part 240, and a highly stable water column is formed in each position indicator chamber 220. In this stage, the intermediate chamber 2320 is connected to the outside of the piston chamber 230 through the first exhaust part 430, and the air in the intermediate chamber 2320 can be smoothly discharged. The pressurizing component does not pressurize the oil filter 700. In the later stage of piston rod 300 movement, limiting part 241 is used to limit sealing ring 320 from continuing to move downward with piston rod 300. Since sealing ring 320 is elastically set on piston rod 300 or piston head 310 through first elastic member 410, limiting part 241 does not limit piston rod 300 from continuing to move downward, so that piston rod 300 can continue to move downward and push pressurizing piston 400 to move. In this stage, pressurizing chamber 2321 is connected to oil filter 700 through first exhaust part 430, and air pressure in pressurizing chamber 2321 increases, thereby achieving the effect of pressurizing inside oil filter 700.

[0023] like Figure 4 As shown, in some embodiments, the sealing ring 320 is elastically disposed on the piston head 310 by a first elastic member 410. Specifically, a connecting rod 330 is fixed on the piston head 310, and the connecting rod 330 movably passes through the sealing ring 320. A limiting end plate 331 and a limiting boss 332 are respectively fixed on the connecting rod 330 located on both sides of the sealing ring 320. The first elastic member 410 is a compression spring that is movably sleeved outside the connecting rod 330 and located between the limiting end plate 331 and the sealing ring 320.

[0024] like Figure 3 As shown, in some embodiments, the first exhaust section 430 includes a first U-shaped channel 431, a first sealing sleeve 432, a spring tube 434, and a vent hole 433. The first sealing sleeve 432 is fixed on the cover 200. One end of the first sealing sleeve 432 is open and the other end is closed. The closed end of the first sealing sleeve 432 is connected to the oil filter 700 through the spring tube 434. One end of the first U-shaped channel 431 is connected to the second cavity 232, and the other end is aligned with the open end of the first sealing sleeve 432. The vent hole 433 is located on the pressure piston 400 at a position corresponding to the first U-shaped channel 431. In the first exhaust section 430 with this structure, before the piston rod 300 moves, the first U-shaped channel 431 is not inserted with the first sealing sleeve, and the second cavity 232 is connected to the outside through the first U-shaped channel 431. The air in the middle cavity 2320 of the second cavity 232 can be smoothly discharged to the outside through the first U-shaped channel 431, and the movement of the piston head 310 will not drive the pressurized piston 400 head 310 to move; while in the later stage of the piston rod 300 movement... In the first section, the lower end of the piston rod 300 abuts against the pressurizing piston 400. The first U-shaped channel 431 on the piston rod 300 is aligned with the vent hole 433 of the pressurizing piston. The first U-shaped channel 431 is inserted into the first sealing sleeve 432, thereby connecting the pressurizing chamber 2321 to the oil filter 700. As the piston rod 300 continues to move downward, the air in the pressurizing chamber 2321 is forced into the oil filter 700, thus pressurizing the oil filter 700. In some embodiments, in order to improve the sealing performance of the connection between the spring tube 434 and the oil filter 700, a rubber base 110 is also provided at the bottom of the leak detection container 100. During the test, the threaded cover plate of the oil filter 700 is pressed against the rubber base 110. The spring tube 434 passes through the rubber base 110 and communicates with the interior of the oil filter 700. The connection between the spring tube 434 and the rubber base 110 is sealed with sealant.

[0025] like Figure 3 As shown, in some embodiments, the second elastic element 420 is a compression spring disposed between the pressure piston 400 and the cover 200.

[0026] In the above scheme, when the connecting part 240 is blocked by the sealing ring 320, the first cavity 231 is in a sealed state. The movement of the piston rod 300 and the piston head 310 will become difficult due to the decrease in air pressure inside the first cavity 231. In order to make the movement of the piston rod 300 and the piston head 310 unrestricted, such as Figure 3As shown, in some embodiments, the pressurizing component further includes a second exhaust section 440, which is configured to connect the first cavity 231 to the outside of the piston cavity 230 during the synchronous movement of the pressurizing piston 400 along the piston head 310 along the piston cavity 230. By providing the second exhaust section 440, during the synchronous movement of the pressurizing piston 400 along the piston head 310 along the piston cavity 230, the second exhaust section 440 can draw outside air into the first cavity 231, maintaining a constant air pressure inside the first cavity 231 and preventing the movement of the piston rod 300 and the piston head 310 from being hindered due to a decrease in air pressure inside the first cavity 231.

[0027] like Figure 3 As shown, in some embodiments, the second exhaust section 440 includes a second U-shaped channel 441 and a second sealing sleeve 442. The second sealing sleeve 442 is fixed on the piston rod 300 and has an opening at one end. One end of the second U-shaped channel 441 is connected to the first cavity 231, and the other end is aligned with the opening of the second sealing sleeve 442. In the first exhaust section 430 with this structure, before the piston column 300 moves, the end of the second U-shaped channel 441 away from the first cavity 231 is inserted into the second sealing sleeve 442 and sealed by the second sealing sleeve 442. At this time, the air pressure in the first cavity 231 can continuously decrease as the piston column 300 moves downward, so as to form a water column in the position indicator cavity 220 until the connecting part 240 is blocked by the sealing ring 320. In the later stage of the piston column 300 moving, the end of the second U-shaped channel 441 away from the first cavity 231 moves out from the second sealing sleeve 442, and the first cavity 231 is connected to the outside through the second U-shaped channel 441. At this time, the piston head 310 will not have difficulty moving due to the decrease in air pressure in the first cavity 231, ensuring that the piston head 310 moves smoothly.

[0028] like Figure 4 and Figure 5 As shown, in some embodiments, the limiting part 241 is a boss structure protruding from the inner wall of the piston cavity 230, and the connecting part 240 is disposed on the boss structure. The sealing ring 320 and the boss structure seal the connecting part 240 by surface-to-surface compression. Using the above-described limiting part 241, the distance the sealing ring 320 can move downwards within the piston cavity 230 can be limited, and the connecting part 240 can also be blocked. Furthermore, to improve the sealing effect of the sealing ring 320 on the connecting part 240, both the inner side of the boss structure and the outer side of the sealing ring 320 are conical surfaces. The connecting part 240 is a vent passage disposed on the cover 200, with one end connected to the indicator cavity 220 and the other end disposed on the inner conical surface of the boss structure.

[0029] like Figure 3As shown, in some embodiments, the lower end of the positioning cavity 220 is configured as a tapered flare 221. By configuring the lower end of the positioning cavity 220 as a tapered flare 221, air bubbles generated from the weld 710 position can more easily enter the positioning cavity 220, thereby more accurately determining the leak point.

[0030] like Figure 1 and Figure 2 As shown, in some embodiments, the sealing testing device for the oil filter 700 further includes a frame 500, a leak detection container 100 disposed at the bottom of the frame 500, and a drive device 600 fixed at the top of the frame 500. The drive device 600 is used to drive the piston rod 300 to move relative to the cover 200. The drive device 600 can be a linear drive device such as a cylinder or an electric push rod. Of course, in other embodiments, the piston rod 300 can also be driven manually to move relative to the cover 200.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealing performance testing device for oil filters, characterized in that, The system includes a leak detection container (100) and a cap assembly. The leak detection container (100) is suitable for holding test water. The cap assembly includes a cap body (200) and a piston rod (300). The bottom of the cap body (200) has a positioning groove (210) capable of accommodating the housing of an oil filter (700). Several elongated indicator cavities (220) extending axially toward the cap body (200) are provided on the cap body (200) around the positioning groove (210). The lower end of each indicator cavity (220) is an open structure and is located adjacent to the weld (710) between the housing of the oil filter (700) and the threaded cover plate. The body (200) is also provided with a piston chamber (230), and the piston column (300) is provided with a piston head (310) and a sealing ring (320). The piston column (300) is dynamically sealed to the piston chamber (230) through the piston head (310). The piston head (310) divides the piston chamber (230) into a first cavity (231) and a second cavity (232). The upper end of the position indicator cavity (220) is connected to the first cavity (231) through a connecting part (240). The sealing ring (320) is located in the first cavity (231) and corresponds to the position of the connecting part (240).

2. The sealing performance testing device for oil filters according to claim 1, characterized in that: The sealing performance testing device further includes a pressurizing component, which includes a pressurizing piston (400), a first elastic element (410), a second elastic element (420), and a first venting part (430). The sealing ring (320) is elastically disposed on the piston rod (300) or the piston head (310) via the first elastic element (410). The communicating part (240) is provided with a limiting part (241) for limiting the movement of the sealing ring (320). The pressurizing piston (400) is elastically disposed on the piston rod (300) or the piston head (310) via the first elastic element (410). Two elastic elements (420) are elastically disposed in the second cavity (232), and the pressurizing piston (400) divides the second cavity (232) into a middle cavity (2320) and a pressurizing cavity (2321); the first exhaust section (430) is configured to connect the middle cavity (2320) with the outside of the piston cavity (230) and the pressurizing cavity (2321) with the inside of the oil filter (700) in sequence during the movement of the piston head (310) along the piston cavity (230).

3. The sealing performance testing device for oil filters according to claim 2, characterized in that: A connecting rod (330) is fixed on the piston head (310). The connecting rod (330) movably passes through the sealing ring (320). A limiting end plate (331) and a limiting boss (332) are respectively fixed on the connecting rod (330) located on both sides of the sealing ring (320). The first elastic member (410) is a compression spring that is movably sleeved outside the connecting rod (330) and located between the limiting end plate (331) and the sealing ring (320).

4. The sealing performance testing device for oil filters according to claim 2, characterized in that: The first exhaust section (430) includes a first U-shaped channel (431), a first sealing sleeve (432), a spring tube (434), and a vent (433). The first sealing sleeve (432) is fixed on the cover (200). One end of the first sealing sleeve (432) is open and the other end is closed. The closed end of the first sealing sleeve (432) is connected to the oil filter (700) through the spring tube (434). One end of the first U-shaped channel (431) is connected to the second cavity (232), and the other end is aligned with the open end of the first sealing sleeve (432). The vent (433) is located on the pressurizing piston (400) at a position corresponding to the first U-shaped channel (431).

5. The sealing performance testing device for oil filters according to claim 2, characterized in that: The second elastic element (420) is a compression spring disposed between the pressurizing piston (400) and the cover (200).

6. The sealing performance testing device for oil filters according to any one of claims 2 to 5, characterized in that: The pressurizing component further includes a second exhaust section (440), which is configured to communicate the first cavity (231) with the outside of the piston cavity (230) as the pressurizing piston (400) moves synchronously with the piston head (310) along the piston cavity (230).

7. The sealing performance testing device for oil filters according to claim 6, characterized in that: The second exhaust section (440) includes a second U-shaped channel (441) and a second sealing sleeve (442). The second sealing sleeve (442) is fixed on the piston rod (300) and has an opening at one end. One end of the second U-shaped channel (441) is connected to the first cavity (231), and the other end is aligned with the opening of the second sealing sleeve (442).

8. The sealing performance testing device for oil filters according to claim 2, characterized in that: The limiting part (241) is a boss structure that protrudes from the inner wall of the piston cavity (230). The connecting part (240) is provided on the boss structure. The sealing ring (320) seals the connecting part (240) with the boss structure by pressing the surface together.

9. The sealing performance testing device for oil filters according to claim 1, characterized in that: The lower end of the positioning cavity (220) is configured as a tapered flare (221).

10. The sealing performance testing device for oil filters according to claim 1, characterized in that: It also includes a frame (500), the leak detection container (100) is disposed at the bottom of the frame (500), and a drive device (600) is fixed at the top of the frame (500), the drive device (600) being used to drive the piston rod (300) to move relative to the cover (200).

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