Anti-loose filter assembly

Abstract

The utility model relates to a fuel pump with metal oil outlet cover, and relates to an anti-loosening filter assembly with a more reliable connecting structure. The anti-loosening filter assembly comprises a filter main body, which comprises a shell, a cover and a filter element. The cover is connected to the shell, and the filter element is installed in the shell. The lower end outer wall of the cover is provided with an upper positioning part along the circumference. The lower end outer wall of the cover is provided with a plurality of equidistantly spaced lower positioning parts along the circumference. The lower positioning parts are located below the upper positioning part. A limiting part is arranged on one side between the lower positioning parts and the upper positioning part. The upper end inner wall of the shell is provided with a plurality of positioning blocks along the circumference. The length of the positioning blocks is less than the distance between two adjacent lower positioning parts. The positioning blocks can enter between the lower positioning parts and the upper positioning part. The limiting part plays a circumferential limiting role on the positioning blocks. The anti-loosening filter assembly can effectively resist vibration and thermal deformation and maintain long-term sealing reliability through the improvement of the connecting structure of the cover and the shell.

Description

Technical Field

[0001] This utility model relates to an automotive component, specifically to a filter assembly used in fuel-powered vehicles. Background Technology

[0002] As a key filtration component of the automotive fuel system, the structural stability of the fuel filter directly affects the safety and reliability of the engine's fuel supply system. Traditional fuel filters typically employ a three-stage structure: a cylindrical shell, an end cover, and an internal filter element. The connection between the cover and the shell is generally a threaded fit. While this design offers advantages such as convenient assembly and low cost, it reveals significant drawbacks in long-term use: 1. Mechanical loosening: Continuous vibrations during vehicle operation can cause displacement of the threaded joint. Combined with frequent hot and cold cycles in the fuel system, the thermal expansion and contraction of the material further weakens the thread engagement force. 2. Risk of seal failure: Displacement caused by loosening can disrupt the O-ring compression at the interface between the cover and the shell, leading to fuel leakage. 3. Increased maintenance costs: To address the loosening problem, current technology requires applying thread-locking adhesive to the threaded connection. However, this method cannot completely prevent periodic loosening and increases disassembly difficulty and repair time. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, this utility model innovatively provides a filter assembly with a more reliable connection structure to prevent loosening.

[0004] This anti-loosening filter assembly includes a filter body, which comprises a housing, a cover, and a filter element. The cover is connected to the housing, and the filter element is installed inside the housing. The cover is characterized by having an upper positioning portion along its lower outer wall and multiple equally spaced lower positioning portions along its lower outer wall. The lower positioning portions are located below the upper positioning portions, and a limiting portion is provided on one side between the lower and upper positioning portions. The housing has multiple positioning blocks along its upper inner wall, the length of which is less than the distance between two adjacent lower positioning portions. The positioning blocks can enter between the lower and upper positioning portions, and the limiting portion provides circumferential limiting for the positioning blocks.

[0005] The bottom of the upper positioning part is provided with a positioning slot, and the upper end face of the positioning block is provided with a positioning protrusion, which can be locked in the positioning slot.

[0006] The upper outer wall of the housing is fitted with a steel strip retainer, which corresponds to the position of the positioning block.

[0007] The lower outer wall of the cover is provided with an annular upper step along the circumference, and the annular upper step is located below the lower positioning part. The upper inner wall of the shell is provided with an annular lower step along the circumference, and the annular lower step is located below the positioning block. The annular upper step is located above the annular lower step, and a sealing ring is engaged between the annular upper step and the annular lower step.

[0008] The filter body is connected to the remote oil suction assembly via a connecting pipe. The remote oil suction assembly includes an ejector tube, an ejector nozzle, and a return oil pipe. The ejector nozzle is located inside the ejector tube, which is connected to the return oil pipe. There is a return oil chamber between the ejector nozzle and the interior of the ejector tube. The end of the return oil pipe opposite to the ejector nozzle has a conical opening that communicates with the return oil chamber. The front end of the ejector nozzle is located inside the conical opening. One side of the ejector tube has a return oil port that communicates with the return oil chamber. The ejector tube has an oil inlet that communicates with the ejector nozzle, and the connecting pipe is connected to the oil inlet.

[0009] A first filter mesh is provided at the oil return port.

[0010] A second filter mesh is provided on the path between the oil inlet and the ejector nozzle.

[0011] According to the present invention, an anti-loosening filter assembly can effectively resist vibration and thermal deformation and maintain long-term sealing reliability by improving the connection structure between the cover and the shell. Attached Figure Description

[0012] Figure 1 This is a perspective view of the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 A three-dimensional view of the cover; Figure 4 This is a three-dimensional view of the shell; Figure 5 This is a sectional view of the cover after it has been connected to the shell. Figure 6 A 3D view of the remote oil absorption assembly; Figure 7 This is a cross-sectional view of the distal oil suction assembly; Figure 8 This is a schematic diagram of a saddle-shaped fuel tank. Detailed Implementation

[0013] like Figure 1 and Figure 2 As shown, this anti-loosening filter assembly includes a filter body, which includes a housing 2, a cover 1, and a filter element 3. The cover 1 is connected to the housing 2, and the filter element 3 is installed inside the housing 2. Figure 3As shown, an upper positioning part 10 is provided along the circumference of the lower outer wall of the cover 1, and a plurality of equally spaced lower positioning parts 11 are provided along the circumference of the lower outer wall of the cover 1. The lower positioning parts 11 are located below the upper positioning parts 10. In addition, a limiting part 12 is provided on one side between the lower positioning parts 11 and the upper positioning parts 10; Figure 4 As shown, multiple positioning blocks 20 are provided circumferentially on the upper inner wall of the housing 2. The length of the positioning block 20 is less than the distance between two adjacent lower positioning parts 11. The positioning block 20 can enter between the lower positioning part 11 and the upper positioning part 10. The limiting part 12 provides circumferential limiting for the positioning block 20. During assembly, the lower end of the cover 1 is inserted into the housing 2. Since the length of the positioning block 20 is less than the distance between two adjacent lower positioning parts 11, the positioning block 20 first passes between the two lower positioning parts 11. When the positioning block 20 abuts against the upper positioning part 10, the cover 1 is then rotated to allow the positioning block 20 to enter between the lower positioning part 11 and the upper positioning part 10. In this way, the positioning block 20 is stuck between the lower positioning part 11 and the upper positioning part 10, and the positioning block 20 cannot move up and down. That is to say, the cover 1 cannot move up and down relative to the housing 2, thus achieving a locking function in the vertical direction.

[0014] To prevent the cover 1 from shifting relative to the shell 2 in the circumferential direction, such as Figure 3 and Figure 4 As shown, a positioning slot 101 is provided at the bottom of the upper positioning part 10, and a positioning protrusion 200 is provided on the upper end face of the positioning block 20. When the cover 1 is rotated so that the positioning block 20 enters between the lower positioning part 11 and the upper positioning part 10, the positioning protrusion 200 can be locked in the positioning slot 101. In this way, the cover 1 cannot be displaced relative to the shell 2 in the circumferential direction, thus playing the role of circumferential locking.

[0015] This connection structure allows the cover 1 and the shell 2 to be locked in the vertical direction and in the circumferential direction. Compared with threaded connections, it can effectively resist vibration and thermal deformation and maintain long-term sealing reliability.

[0016] To further limit the plastic deformation of the shell and cover and increase the reliability of the connection, such as Figure 1 and Figure 2 As shown, a steel strap retainer 4 is clamped to the upper outer wall of the housing 2, and the position of the steel strap retainer 4 corresponds to that of the positioning block 20. During installation, the steel strap retainer 4 is first clamped to the upper outer wall of the housing 2, and then the cover 1 is installed. The steel strap retainer 4 can limit the plastic deformation of the housing and the cover, ensuring sealing performance.

[0017] To facilitate the installation of the sealing ring, such as Figure 5As shown, an annular upper step 13 is provided along the circumference of the lower outer wall of the cover 1. The annular upper step 13 is located below the lower positioning part 11. An annular lower step 22 is provided along the circumference of the upper inner wall of the shell 2. The annular lower step 22 is located below the positioning block 20. The annular upper step 13 is located above the annular lower step 22. A sealing ring 16 is engaged between the annular upper step 13 and the annular lower step 22. The sealing ring 16 can play the role of preventing leakage.

[0018] like Figure 8 As shown, this filter assembly is installed as a sub-assembly in the auxiliary fuel tank B of the saddle-shaped fuel tank (some cars use a saddle-shaped fuel tank design). The main fuel tank A, also in the saddle-shaped fuel tank, houses the main filter assembly, which supplies fuel to the engine. When the fuel in the main fuel tank A is depleted, fuel from the auxiliary fuel tank B needs to be diverted to the main fuel tank A. Therefore, as... Figure 1 As shown, the filter body is also connected to the remote oil suction assembly 5 via the connecting pipe 6. The remote oil suction assembly 5 guides the fuel in the auxiliary oil tank B to the main oil tank A via the return pipe 7.

[0019] like Figure 6 and Figure 7 As shown, the remote oil suction assembly 5 includes an ejector tube 51, an ejector nozzle 52, and a return oil pipe 50. The ejector nozzle 52 is located inside the ejector tube 51, and the ejector tube 51 is connected to the return oil pipe 50. There is a return oil chamber 54 between the ejector nozzle 52 and the interior of the ejector tube 51. The end of the return oil pipe 50 opposite to the ejector nozzle 52 has a conical opening 500 that communicates with the return oil chamber 54. The front end of the ejector nozzle 52 is located inside the conical opening 500. One side of the ejector tube 51 is provided with a return oil port 55 that communicates with the return oil chamber 54. The ejector tube 51 is provided with an oil inlet port 53 that communicates with the ejector nozzle 52. The connecting pipe 6 is connected to the oil inlet port 53. During operation, the oil pump pumps fuel into the filter body. Fuel within the filter body is then delivered to the injector nozzle 52 via the connecting pipe 6. The injector nozzle 52 sprays fuel into the conical opening 500 of the return pipe 50. As the air around the conical opening 500 is drawn forward into the return pipe 50, a vacuum zone (or low-pressure zone) is created around the opening. Since the conical opening 500 is connected to the return chamber 54, fuel from the auxiliary fuel tank B enters the return chamber 54 through the return port 55, then through the conical opening 500 into the return pipe 50, and finally through the return pipe 7 into the main fuel tank A. This remote fuel suction assembly 5 enables remote fuel suction.

[0020] Finally, it is worth mentioning that, in order to prevent the return port 55 from becoming clogged, a first filter mesh 56 is provided at the return port 55. The first filter mesh 56 can block large particles of impurities and prevent the return port 55 from becoming clogged; similarly, a second filter mesh 57 is provided on the path between the oil inlet port 53 and the ejector nozzle 52, and the second filter mesh 57 can prevent the ejector nozzle 52 from becoming clogged.

Claims

1. An anti-loosening filter assembly, comprising a filter body, the filter body including a housing (2), a cover (1) and a filter element (3), the cover (1) being connected to the housing (2), and the filter element (3) being installed inside the housing (2), characterized in that: The lower outer wall of the cover (1) is provided with an upper positioning part (10) along the circumference, and the lower outer wall of the cover (1) is provided with a plurality of equally spaced lower positioning parts (11) along the circumference. The lower positioning parts (11) are located below the upper positioning parts (10), and a limiting part (12) is provided on one side between the lower positioning parts (11) and the upper positioning parts (10). The upper inner wall of the shell (2) is provided with a plurality of positioning blocks (20) along the circumference. The length of the positioning block (20) is less than the distance between two adjacent lower positioning parts (11). The positioning block (20) can enter between the lower positioning parts (11) and the upper positioning parts (10). The limiting part (12) plays a circumferential limiting role on the positioning block (20).

2. The anti-loosening filter assembly according to claim 1, characterized in that: The bottom of the upper positioning part (10) is provided with a positioning slot (101), and the upper end surface of the positioning block (20) is provided with a positioning protrusion (200), which can be locked in the positioning slot (101).

3. The anti-loosening filter assembly according to claim 1 or 2, characterized in that: The upper outer wall of the housing (2) is fitted with a steel strip retainer (4), and the steel strip retainer (4) corresponds to the position of the positioning block (20).

4. The anti-loosening filter assembly according to claim 3, characterized in that: The lower outer wall of the cover (1) is provided with an annular upper step (13) along the circumference. The annular upper step (13) is located below the lower positioning part (11). The upper inner wall of the shell (2) is provided with an annular lower step (22) along the circumference. The annular lower step (22) is located below the positioning block (20). The annular upper step (13) is located above the annular lower step (22). A sealing ring (16) is engaged between the annular upper step (13) and the annular lower step (22).

5. The anti-loosening filter assembly according to claim 1 or 2, characterized in that: The filter body is connected to the distal oil suction assembly (5) via a connecting pipe (6). The distal oil suction assembly (5) includes an ejector tube (51), an ejector nozzle (52), and a return oil pipe (50). The ejector nozzle (52) is located inside the ejector tube (51), and the ejector tube (51) is connected to the return oil pipe (50). There is a return oil chamber (54) between the ejector nozzle (52) and the interior of the ejector tube (51). 50) The end opposite to the ejector nozzle (52) has a conical opening (500) that communicates with the return oil chamber (54). The front end of the ejector nozzle (52) is located inside the conical opening (500). One side of the ejector tube (51) is provided with a return oil port (55) that communicates with the return oil chamber (54). The ejector tube (51) is provided with an oil inlet interface (53) that communicates with the ejector nozzle (52). The connecting pipe (6) is connected to the oil inlet interface (53).

6. The anti-loosening filter assembly according to claim 5, characterized in that: A first filter screen (56) is provided at the oil return port (55).

7. The anti-loosening filter assembly according to claim 5, characterized in that: A second filter mesh (57) is provided on the path between the oil inlet (53) and the ejector nozzle (52).

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