A fuel pump oil gas rough filter device

Abstract

The utility model belongs to fuel pump technical field, concretely relates to a kind of oil gas coarse filter device of fuel pump. Including installation base, fuel pump being located at the top of installation base, the oil inlet pipe being communicated with fuel pump, detachably connected in the filter cylinder body below of installation base, the oil outlet pipe being communicated with filter cylinder body bottom, further include: double-layer filter cartridge, be located in filter cylinder body, double-layer filter cartridge includes inner net cylinder and outer net cylinder, inner net cylinder inside forms oil inlet chamber, outer net cylinder and filter cylinder body inner wall form oil outlet chamber, oil outlet chamber is communicated with oil outlet pipe, fuel pump is communicated with oil inlet chamber by oil delivery pipe;Partition rib, be connected between inner net cylinder and outer net cylinder, partition rib separates multiple insertion slot, and filter unit is inserted and mounted in insertion slot;End cap, detachably connected in the upper and lower ends of double-layer filter cartridge respectively, end cap axially compresses filter unit. The above technical scheme can obtain a kind of fuel pump oil gas coarse filter device of filter core split body replacement, support skeleton reusable.

Description

Technical Field

[0001] This utility model belongs to the field of fuel pump technology, specifically relating to a fuel pump coarse filtration device for oil and gas. Background Technology

[0002] Fuel pumps are usually built into the vehicle's fuel tank and are used to deliver fuel to the engine. To intercept solid impurities in the fuel and protect the precision components of the fuel pump, a coarse filter is required in the fuel inlet circuit.

[0003] Existing fuel pump pre-filters mostly use an integrated filter element structure, where the filter media and support frame are bonded or riveted together. When the filter element reaches the end of its service life and needs replacement, the entire support frame must be discarded. The reusable frame structure cannot be recycled, resulting in resource waste and increased long-term maintenance costs. Therefore, there is an urgent need for a fuel pump pre-filter with a replaceable filter element and a reusable support frame. Utility Model Content

[0004] This invention solves the problems mentioned in the background art by setting a partition rib between the inner and outer mesh cylinders of the double-layer filter cartridge to separate the slot and insert the filter unit. The filter unit is axially pressed by the detachable end caps at both ends of the double-layer filter cartridge, so that the filter cartridge frame can be reused and the filter unit can be replaced separately.

[0005] The technical solution of this utility model is implemented as follows: a fuel pump pre-filter includes a mounting base, a fuel pump disposed above the mounting base, an inlet pipe connected to the fuel pump, a filter cylinder detachably connected to the bottom of the mounting base, and an outlet pipe connected to the bottom of the filter cylinder. It also includes: A double-layer filter cartridge is disposed inside the filter cartridge body. The double-layer filter cartridge includes an inner mesh cylinder and an outer mesh cylinder. An oil inlet chamber is formed inside the inner mesh cylinder, and an oil outlet chamber is formed between the outer mesh cylinder and the inner wall of the filter cartridge body. The oil outlet chamber is connected to an oil outlet pipe, and the fuel pump is connected to the oil inlet chamber via an oil delivery pipe. A partition rib connects the inner and outer mesh cylinders, and the partition rib divides into multiple slots, in which filter units are inserted. The end caps are detachably connected to the upper and lower ends of the double-layer filter cartridge, and the end caps axially press the filter unit.

[0006] The present invention is further configured such that the inner mesh cylinder, the outer mesh cylinder and each partition rib are integrally formed.

[0007] The present invention is further configured such that the end cap and the corresponding ends of the outer mesh cylinder are detachably connected by threads.

[0008] The present invention is further configured such that the end cap located at the lower end of the double-layer filter cartridge is fixedly connected to the bottom of the filter cartridge body by bolts, and the end cap located at the upper end of the double-layer filter cartridge abuts against the lower end face of the mounting base.

[0009] The present invention is further provided that the inner sidewall of the slot is provided with an anti-slip structure for limiting the movement of the filter unit.

[0010] The present invention is further configured such that the anti-slip structure consists of a plurality of oil-resistant elastic protrusions arranged along the axial direction of the slot, the oil-resistant elastic protrusions protruding from the inner sidewall of the slot and abutting against the side of the filter unit.

[0011] The present invention is further configured such that the filtration unit is a stainless steel powder sintered filter plate.

[0012] By adopting the above technical solution, the beneficial effects that this utility model can achieve are: 1. The double-layer filter cartridge forms a reusable support frame, which, together with the filter unit that can be individually plugged in and replaced in the slot, eliminates the need to discard the entire filter cartridge structure when replacing filter cartridges, thus improving the reusability of the filter cartridge structure.

[0013] 2. The slots formed by the partition ribs enable the direct insertion and positioning of the filter unit. Combined with the detachable end caps at both ends, axial clamping and fixing are completed. The filter unit can be replaced without additional bonding or riveting processes, which improves the efficiency of filter element disassembly and replacement.

[0014] 3. The filter unit is radially limited by the oil-resistant elastic protrusions on the inside of the slot. Combined with the bidirectional support of the inner and outer mesh cylinders and the axial pressing of the end cap, the filter unit is not easy to move or shift under fuel pulse conditions, which improves the stability of the filter device operation. Attached Figure Description

[0015] Figure 1 This is a cross-sectional structural schematic diagram of the present invention; Figure 2 This is a utility model Figure 1 A magnified structural diagram of part A; Figure 3 This is a three-dimensional structural diagram of the double-layer filter cartridge of this utility model.

[0016] The attached diagram is labeled as follows: 1. Mounting base; 2. Fuel pump; 3. Fuel inlet pipe; 4. Filter cylinder; 5. Fuel outlet pipe; 6. Double-layer filter cylinder; 60. Inner mesh cylinder; 61. Outer mesh cylinder; 7. Fuel inlet chamber; 8. Fuel outlet chamber; 9. Fuel delivery pipe; 10. Separating rib; 11. Slot; 12. Filter unit; 13. End cap; 14. Oil-resistant elastic protrusion. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-3 : Example: This embodiment provides a fuel pump pre-filter, including a mounting base 1, a fuel pump 2 disposed above the mounting base 1, an inlet pipe 3 communicating with the fuel pump 2, a filter cylinder 4 detachably connected to the bottom of the mounting base 1, and an outlet pipe 5 communicating with the bottom of the filter cylinder 4. It also includes: A double-layer filter cartridge 6 is disposed inside the filter cartridge body 4. The double-layer filter cartridge 6 includes an inner mesh cartridge 60 and an outer mesh cartridge 61. An oil inlet chamber 7 is formed inside the inner mesh cartridge 60, and an oil outlet chamber 8 is formed between the outer mesh cartridge 61 and the inner wall of the filter cartridge body 4. The oil outlet chamber 8 is connected to the oil outlet pipe 5. The fuel pump 2 is connected to the oil inlet chamber 7 via the oil supply pipe 9. A partition rib 10 is connected between the inner mesh cylinder 60 and the outer mesh cylinder 61. The partition rib 10 divides into multiple slots 11, and filter units 12 are inserted into the slots 11. End caps 13 are detachably connected to the upper and lower ends of the double-layer filter cartridge 6, and the end caps 13 axially press the filter unit 12.

[0018] This embodiment provides a fuel pump pre-filter device, which has an overall columnar structure arranged vertically, with the mounting base 1 as the middle supporting body. The upper part integrates the fuel pumping structure, and the lower part integrates the filter structure. The whole device is used for pre-filtering of fuel in the vehicle's fuel tank.

[0019] Mounting base 1 is a circular flange-shaped load-bearing component. It serves as the mounting reference for the upper and lower parts of the device, supports and fixes the fuel pump 2, connects to the filter cylinder 4 below, and separates the upper and lower spaces. Mounting base 1 is located in the middle of the device and is arranged horizontally. Its upper surface is fastened to the bottom flange of fuel pump 2 by bolts. The bolt connection facilitates the individual disassembly and maintenance of fuel pump 2. A through hole is opened in the center of mounting base 1, through which the fuel pipe 9 passes to connect the upper and lower fuel lines. An oil-resistant sealing ring is embedded between the inner wall of the through hole and the outer wall of the fuel pipe 9. The purpose of setting the oil-resistant sealing ring is to separate the central oil side from the external clean oil side, preventing unfiltered fuel from directly entering the oil outlet chamber 8 through the assembly gap, thus ensuring the filtration effect.

[0020] Fuel pump 2 is a cylindrical pump body component used to provide pressure for fuel flow, pressurizing the input fuel to be filtered and delivering it to the filter chamber below. Fuel pump 2 is coaxially mounted above mounting base 1, with its bottom flange fitted and fixed to the upper surface of mounting base 1; the top of fuel pump 2 is the fuel inlet end, which is interference-fitted and welded to fuel inlet pipe 3, forming a reliable static seal at the joint; the bottom of fuel pump 2 is the fuel outlet end, which connects downward to fuel delivery pipe 9, delivering the pressurized fuel downward.

[0021] The fuel inlet pipe 3 is a circular tubular component used to introduce the fuel to be filtered into the fuel tank, providing the filtration material for the device. The fuel inlet pipe 3 is vertically installed at the top of the fuel pump 2. Its lower end is interference-fitted to the fuel inlet end of the fuel pump 2 and then welded together. Its upper end is externally connected to the fuel supply passage inside the fuel tank.

[0022] The filter cylinder 4 is a vertical cylindrical shell component with an open top and a closed bottom. It is used to house the internal double-layer filter cylinder 6 structure and encloses the outer oil outlet chamber 8, serving as the external support shell for the filtration section. The filter cylinder 4 is coaxially mounted below the mounting base 1. The inner wall of its upper opening is provided with internal threads, and the lower outer edge of the mounting base 1 is provided with matching external threads. The filter cylinder 4 and the mounting base 1 are detachably connected by threaded engagement. The threaded connection allows for disassembly and assembly without special tools, facilitating daily maintenance and replacement of consumables for the internal filter components. An oil outlet pipe 5 is welded and fixed at the bottom center of the filter cylinder 4. The upper opening of the oil outlet pipe 5 corresponds to the bottom area of ​​the annular oil outlet chamber 8. This design allows clean fuel in the oil outlet chamber 8 to directly flow into the oil outlet pipe 5, reducing fuel retention at the bottom of the cylinder and lowering the flow resistance of the oil path. The inner diameter of the filter cylinder 4 is larger than the outer diameter of the double-layer filter cylinder 6. After assembly, the two form an annular oil outlet chamber 8 between the inner wall of the cylinder and the outer wall of the double-layer filter cylinder 6. The oil outlet chamber 8 is connected to the oil outlet pipe 5 at the bottom.

[0023] The oil outlet pipe 5 is a circular tubular component used to output filtered clean fuel and deliver the filtered fuel to the engine fuel supply system. The oil outlet pipe 5 is vertically installed at the bottom of the filter cylinder 4, directly below the annular oil outlet chamber 8. Its upper end is welded and fixed to the bottom wall of the filter cylinder 4 and connected to the oil outlet chamber 8, while its lower end is connected to the vehicle's fuel delivery pipeline.

[0024] The double-layer filter cartridge 6 is a coaxial double-layer cylindrical structure, which serves as a reusable support frame for the filter unit 12, separating the central oil inlet chamber 7 from the annular installation space, while providing radial support and constraint for the filter unit 12. The double-layer filter cartridge 6 is coaxially housed in the internal cavity of the filter body 4, and is composed of an inner mesh cylinder 60, an outer mesh cylinder 61, and a separating rib 10 connecting the two, all of which are integrally molded. The purpose of the integral molding design is to eliminate the splicing gaps between the inner and outer cylinders and the ribs, prevent fuel from short-circuiting and leaking through the gaps, and at the same time improve the overall structure's resistance to oil pressure impact and ensure structural strength stability.

[0025] The inner mesh cylinder 60 is a thin-walled cylindrical component with uniformly distributed mesh holes on its sidewalls. It is used to enclose and form the central oil inlet chamber 7, and at the same time, it provides radial support to the inner side of the filter unit 12. The mesh holes in the cylinder wall can evenly distribute the fuel in the oil inlet chamber 7 to the outer filter unit 12. The inner mesh cylinder 60 is coaxially arranged inside the outer mesh cylinder 61. Its outer wall is integrally connected to the inner end of the partition rib 10, and its upper and lower end faces abut against the inner end faces of the upper and lower end caps 13, respectively. The upper opening of the inner mesh cylinder 60 connects to the outlet end of the fuel supply pipe 9, so that the fuel output by the fuel pump 2 directly enters the central oil inlet chamber 7 formed by the inner mesh cylinder 60.

[0026] The outer mesh cylinder 61 is a thin-walled cylindrical component with uniformly distributed mesh holes on its sidewalls. Its diameter is larger than that of the inner mesh cylinder 60. It is used to radially constrain the outer side of the filter unit 12. The mesh holes in the cylinder wall allow the filtered fuel to flow out to the outer oil outlet chamber 8, and at the same time provide a connecting base for the end caps 13 at both ends. The outer mesh cylinder 61 is coaxially sleeved outside the inner mesh cylinder 60. Its inner wall is integrally connected to the outer end of the partition rib 10. The outer walls at both ends are machined with external threads for threaded connection with the corresponding end caps 13. An annular gap is left between the outer wall of the outer mesh cylinder 61 and the inner wall of the filter cylinder 4. This gap is the oil outlet chamber 8.

[0027] The partition rib 10 is an axially extending strip-shaped rib plate component used to connect the inner mesh cylinder 60 and the outer mesh cylinder 61, enhancing the overall structural rigidity of the double-layer filter cylinder 6. Simultaneously, it divides the annular space between the inner and outer cylinders into independent mounting slots, enabling circumferential positioning of the filter unit 12. The partition rib 10 is located within the annular space between the inner mesh cylinder 60 and the outer mesh cylinder 61, evenly distributed circumferentially along the double-layer filter cylinder 6, and extends axially through the entire height of the double-layer filter cylinder 6. The inner side of the partition rib 10 is integrally connected to the outer wall of the inner mesh cylinder 60, and the outer side is integrally connected to the inner wall of the outer mesh cylinder 61. Two adjacent partition ribs 10, the outer wall section of the inner mesh cylinder 60, and the inner wall section of the outer mesh cylinder 61 together form an axially penetrating slot 11. The purpose of using the partition rib 10 to divide the slot 11 is to achieve circumferential and radial positioning of the filter unit 12 solely through the cylinder's own structure, eliminating the need for additional fasteners, adhesives, or other fixing structures, thus simplifying the filter unit assembly process.

[0028] The slot 11 is an axially through-hole fan-shaped groove structure. Its function is to accommodate and position the filter unit 12, restrict the circumferential rotation and radial displacement of the filter unit 12, and provide a guide for the insertion and installation of the filter unit 12. The slots 11 are evenly arranged along the circumference of the double-layer filter cylinder 6, and are open at both ends. Their cross-sectional shape is adapted to the cross-sectional shape of the filter unit 12. The two side walls of the slot 11 are the side walls of the partition rib 10, the inner side wall is the outer wall of the inner mesh cylinder 60, and the outer side wall is the inner wall of the outer mesh cylinder 61. The filter unit 12 can be inserted into the slot axially from the end of the slot 11.

[0029] The filter unit 12 is a fan-shaped plate-like filter component used to intercept solid impurities in fuel, achieving coarse filtration of fuel gas. It is a consumable component that can be replaced periodically. The shape of the filter unit 12 is adapted to the cross-sectional shape of the slot 11, and its height matches the axial length of the slot 11. The filter unit 12 is inserted into the corresponding slot 11. The two sides of the filter unit 12 are in contact with the two side walls of the slot 11, the inner side is in contact with the outer wall of the inner mesh cylinder 60, and the outer side is in contact with the inner wall of the outer mesh cylinder 61. During installation, the inner side of the filter unit 12 corresponds to the oil inlet side, and the outer side corresponds to the oil outlet side, matching the fuel flow direction of inlet and outlet. The upper and lower end faces of the filter unit 12 abut against the inner sides of the upper and lower end caps 13, respectively. In this embodiment, the filter unit 12 adopts a stainless steel powder sintered filter plate, which has the characteristics of being resistant to fuel corrosion and can be reused by cleaning. The purpose of adopting the split plug-in filter unit 12 is that when the consumables are replaced, only the filter plate itself needs to be replaced. The double-layer filter cartridge 6 frame can be reused for a long time, reducing material waste and lowering long-term use costs.

[0030] The inner wall of slot 11 is provided with an anti-slip structure, which consists of several oil-resistant elastic protrusions 14 arranged along the axial direction of slot 11. These protrusions increase the frictional damping between the filter unit 12 and the side wall of slot 11, limiting axial movement or circumferential swaying of the filter unit 12 under oil pressure fluctuations. The oil-resistant elastic protrusions 14 are made of oil-resistant rubber and are vulcanized and bonded to the side wall of the partition rib 10. They protrude from the side wall surface of slot 11 and are arranged axially along slot 11. When the filter unit 12 is inserted into slot 11, the oil-resistant elastic protrusions 14 are compressed and undergo elastic deformation, tightly abutting against the side of the filter unit 12. This improves the installation stability of the filter unit 12 without affecting normal insertion and removal operations. The purpose of this anti-slip structure is to improve the installation stability of the filter unit 12 under pulsed oil pressure conditions without increasing the difficulty of insertion and removal operations, and to prevent the filter unit from moving, making abnormal noises, or leaking due to misalignment.

[0031] The double-layer filter cartridge 6 has end caps 13 at its upper and lower ends. The end caps 13 are annular cap-shaped components with internal threads, which are used to seal the openings at both ends of the double-layer filter cartridge 6, axially press the filter unit 12 in the slot 11 to prevent axial movement of the filter unit 12, and at the same time achieve end sealing and external connection of the filter cartridge. The two end caps 13 are respectively installed at the upper and lower ends of the double-layer filter cartridge 6. The inner ring surface of the end cap 13 is machined with internal threads, which are screwed into the external threads at the end of the outer mesh cylinder 61 to achieve a detachable connection between the end cap 13 and the double-layer filter cartridge 6. The purpose of adopting the detachable design with thread engagement is to simultaneously complete the end sealing and axial pressing of the filter unit by screwing on the end cap 13, making the disassembly and assembly operation simple. An annular oil-resistant sealing gasket is embedded on the inner end face of the end cap 13. During the screwing process, the sealing gasket is squeezed and tightly adheres to the end faces of the outer mesh cylinder 61 and the inner mesh cylinder 60. The purpose of setting the annular oil-resistant sealing gasket is to seal the mating gap between the end cap 13 and the end face of the filter cartridge, preventing fuel from flowing directly out of the end without passing through the filter unit 12, and ensuring that all fuel passes through the filter material to complete the filtration. After the end cap 13 is screwed in place, its inner end face presses against the corresponding end faces of all filter units 12, thereby axially fixing the filter units 12.

[0032] The end cap 13, located at the lower end of the double-layer filter cartridge 6, is fixedly connected to the bottom of the filter cartridge body 4 by bolts, thus fixing the entire double-layer filter cartridge 6 within the lower part of the filter cartridge body 4. The bolt connection ensures the structural strength and positioning accuracy of the lower part of the filter cartridge installation, preventing circumferential displacement and axial movement of the filter cartridge under oil pressure. In a preferred embodiment, the end cap 13 has countersunk holes corresponding to the bolt positions, allowing the bolt heads to be completely embedded inside the end cap 13. This prevents protruding structures from interfering with fuel flow in the oil outlet chamber 8, further optimizing the flow path smoothness.

[0033] The upper end cap 13 located at the upper end of the double-layer filter cartridge 6 has its upper surface abutting against the lower end surface of the mounting base 1. After the filter cartridge 4 is connected and locked to the mounting base 1, the upper end cap 13 is pressed down. Together with the fixing structure at the lower end, the double-layer filter cartridge 6 is completely fixed inside the filter cartridge 4. The upper end cap 13 adopts the abutting and pressing method, which can be used to simultaneously fix the upper part of the filter cartridge with the locking force between the filter cartridge 4 and the mounting base 1. No additional fasteners are required, which simplifies the assembly process.

[0034] The assembly process of this device is as follows: A one-piece molded double-layer filter cartridge 6 is pre-prepared. Oil-resistant elastic protrusions 14 are fixed to the side wall of the slot 11 via vulcanization bonding. Filter units 12 are inserted one by one from the end of the double-layer filter cartridge 6 along the axial direction of the slot 11 to the bottom of the slot, ensuring that the inner surface of the filter unit 12 faces the central oil inlet chamber 7 during insertion. Then, the upper and lower end caps 13 are screwed onto the upper and lower ends of the outer mesh cylinder 61, respectively, so that the oil-resistant sealing gaskets on the inner side of the end caps 13 adhere to the end face of the filter cartridge. Simultaneously, the inner end face of the end caps 13 is pressed... Tighten the end faces of all filter units 12; fix the lower end cap 13 to the bottom of the filter cylinder 4 with countersunk bolts to complete the pre-assembly of the filter cylinder and the cylinder; pass the oil supply pipe 9 through the central through hole of the mounting base 1, and install an oil-resistant sealing ring in the gap of the through hole. The upper end of the oil supply pipe 9 is connected to the oil outlet end of the fuel pump 2, and the lower end is connected to the central oil inlet chamber 7 of the double-layer filter cylinder 6; finally, tighten the upper end of the filter cylinder 4 to the mounting base 1 by screwing it in, so that the upper end cap 13 abuts against the lower end face of the mounting base 1 to complete the assembly of the whole device.

[0035] The working principle of this device is as follows: the fuel to be filtered enters the fuel pump 2 from the fuel inlet pipe 3, and after being pressurized by the fuel pump 2, it is delivered downward through the fuel delivery pipe 9 to the central fuel inlet chamber 7 enclosed by the inner mesh cylinder 60; under pressure, the fuel passes through the mesh of the inner mesh cylinder 60 and is evenly distributed to the filter units 12 in each slot 11, and solid impurities in the fuel are intercepted and retained by the filter units 12; the filtered clean fuel passes through the mesh of the outer mesh cylinder 61 and flows into the annular fuel outlet chamber 8 between the outer mesh cylinder 61 and the inner wall of the filter cylinder 4; the clean fuel in the fuel outlet chamber 8 gathers downward to the inlet of the fuel outlet pipe 5 at the bottom, and finally flows out from the fuel outlet pipe 5 and is delivered to the subsequent engine fuel supply system. When the filter unit 12 needs to be replaced, unscrew the filter cylinder 4 from the mounting base 1, unscrew the end caps 13 at both ends of the double-layer filter cylinder 6, axially pull out the failed filter unit 12 from the slot 11, replace the new filter unit 12, screw the end caps 13 back on, and then put the filter cylinder back into the filter cylinder 4. The double-layer filter cylinder 6 frame can be reused for a long time.

[0036] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A fuel pump pre-filter, comprising a mounting base (1), a fuel pump (2) disposed above the mounting base (1), an inlet pipe (3) communicating with the fuel pump (2), a filter cylinder (4) detachably connected to the bottom of the mounting base (1), and an outlet pipe (5) communicating with the bottom of the filter cylinder (4), characterized in that, Also includes: A double-layer filter cartridge (6) is disposed inside the filter cartridge body (4). The double-layer filter cartridge (6) includes an inner mesh cylinder (60) and an outer mesh cylinder (61). An oil inlet chamber (7) is formed inside the inner mesh cylinder (60), and an oil outlet chamber (8) is formed between the outer mesh cylinder (61) and the inner wall of the filter cartridge body (4). The oil outlet chamber (8) is connected to the oil outlet pipe (5), and the fuel pump (2) is connected to the oil inlet chamber (7) via the oil delivery pipe (9). A partition rib (10) is connected between the inner mesh cylinder (60) and the outer mesh cylinder (61). The partition rib (10) divides into multiple slots (11), and filter units (12) are inserted into the slots (11). End caps (13) are detachably connected to the upper and lower ends of the double-layer filter cartridge (6), and the end caps (13) axially press the filter unit (12).

2. The fuel pump pre-filter according to claim 1, characterized in that, The inner mesh cylinder (60), outer mesh cylinder (61), and each partition rib (10) are integrally formed.

3. The fuel pump pre-filter according to claim 1, characterized in that, The end cap (13) and the corresponding ends of the outer mesh cylinder (61) are detachably connected by threads.

4. The fuel pump pre-filter according to claim 1, characterized in that, The end cap (13) located at the lower end of the double-layer filter cartridge (6) is connected to the bottom of the filter cartridge body (4) by bolts, and the end cap (13) located at the upper end of the double-layer filter cartridge (6) abuts against the lower end face of the mounting base (1).

5. The fuel pump pre-filter according to claim 1, characterized in that, The inner wall of the slot (11) is provided with an anti-slip structure to limit the movement of the filter unit (12).

6. The fuel pump pre-filter according to claim 5, characterized in that, The anti-slip structure consists of several oil-resistant elastic protrusions (14) arranged along the axial direction of the slot (11). The oil-resistant elastic protrusions (14) protrude from the inner wall of the slot (11) and abut against the side of the filter unit (12).

7. The fuel pump pre-filter according to claim 1, characterized in that, The filter unit (12) is a stainless steel powder sintered filter plate.

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