A fuel pump inlet structure

Abstract

This utility model relates to the field of fuel pump technology and discloses a fuel pump inlet structure, including a housing, a pump body fixedly connected to the outer wall of the housing, a second fuel inlet pipe fixedly connected to the outer wall of the pump body, a first fuel inlet pipe fixedly connected to the upper surface of the second fuel inlet pipe, a filter assembly disposed inside the first fuel inlet pipe, the filter assembly including a filter plate slidably connected to the inner wall of the first fuel inlet pipe, a first connecting plate fixedly connected to the lower surface of the filter plate, a fixed ball fixedly connected to the lower surface of the connecting plate, a fixed block slidably connected to the outer wall of the fixed ball, a first connecting block fixedly connected to the outer wall of the fixed block, and a first spring fixedly connected to the lower surface of the connecting block. In this utility model, by setting a detachable filter assembly inside the first fuel inlet pipe, and using the filter plate, first connecting plate, second connecting plate, fixed ball, fixed block, and first spring in combination, the quick installation and removal of the filter assembly is achieved.

Description

Technical Field

[0001] This utility model relates to the field of fuel pump technology, and in particular to a fuel pump inlet structure. Background Technology

[0002] As a key component of a vehicle's fuel supply system, the fuel pump's primary function is to stably and continuously deliver fuel from the fuel tank to the engine's fuel system, ensuring efficient and stable engine operation. During the fuel pump's intake process, a filter structure is typically installed at the inlet to prevent foreign objects or impurities from entering the pump body along with the fuel and causing damage. With modern engines increasingly demanding higher fuel cleanliness, the filtration efficiency and ease of maintenance of the inlet structure have become important factors affecting overall vehicle performance and maintenance costs.

[0003] Current fuel pump inlet structures generally employ fixed filters, which are mostly integrated into the pump body or fuel inlet through welding or fastening. This structure provides primary filtration before fuel flows into the pump body, blocking larger particulate impurities and preventing them from entering the fuel pump and causing wear or blockage. The filter material is mostly metal wire mesh or polymer sieve, with filtration accuracy controlled by the pore size. During pump operation, fuel passes through the filter and is drawn into the pump body, then delivered to the fuel injection system by the high-pressure system.

[0004] However, the filter structure in existing fuel pumps is usually non-removable. Once the filter is clogged or damaged, the entire fuel pump assembly must be replaced, which is not only costly to maintain but also cumbersome, increasing the burden on users. Furthermore, because fixed filters are structurally difficult to clean efficiently, the fuel filtration effect gradually declines, affecting the long-term reliability of the fuel pump and the stability of engine performance. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a fuel pump inlet structure, which aims to improve the problems of poor impurity filtration, non-replaceable filter screen, and high maintenance cost in existing fuel pumps.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fuel pump inlet structure, including the outer shell, a pump body fixedly connected to the outer wall of the outer shell, an inlet pipe two fixedly connected to the outer wall of the pump body, an inlet pipe one fixedly connected to the upper surface of the inlet pipe two, and a filter assembly disposed inside the inlet pipe one;

[0007] The filter assembly includes a filter plate, which is slidably connected to the inner wall of an oil inlet pipe. A connecting plate is fixedly connected to the lower surface of the filter plate. A fixed ball is fixedly connected to the lower surface of the connecting plate. A fixed block is slidably connected to the outer wall of the fixed ball. A connecting block is fixedly connected to the outer wall of the fixed block. A spring is fixedly connected to the lower surface of the connecting block. A connecting plate is fixedly connected to one end of the spring.

[0008] Furthermore, a spring is installed inside the second oil inlet pipe, and a washer is fixedly connected to one end of the second spring. The outer wall of the washer is fixedly connected to the inner wall of the first oil inlet pipe. A fixing ring is fixedly connected to the outer wall of the first oil inlet pipe. A washer is installed on the inner wall of the fixing ring. A connecting block is fixedly connected to the outer wall of the fixing ring. A flange is threadedly connected to the inner wall of the connecting block. A flow damper is fixedly connected to the inner wall of the second oil inlet pipe.

[0009] Furthermore, a fixing plate is fixedly connected to the outer wall of the pump body, and a threaded joint is fixedly connected to the outer wall of the pump body.

[0010] Furthermore, a plunger cap is fixedly connected to the outer wall of the fixed plate, and a plunger spring is sleeved on the outer wall of the plunger cap.

[0011] Furthermore, one end of the plunger spring is fixedly connected to the outer wall of the fixed plate, and the other end of the plunger spring is fixedly connected to the inner wall of the plunger cap.

[0012] Furthermore, a fixing ring is fixedly connected to the lower surface of the second connecting plate, and the outer wall of the fixing block is rotatably connected to the inner wall of the second connecting plate.

[0013] Furthermore, the inner wall of the fixing ring is fixedly connected to the outer wall of the second oil inlet pipe, and the other end of the second spring is fixedly connected to the bottom of the inner wall of the second oil inlet pipe.

[0014] Furthermore, the inner wall of the second washer is fixedly connected to the outer wall of the first oil inlet pipe, and the fixing block is disposed inside the first oil inlet pipe.

[0015] This utility model has the following beneficial effects:

[0016] 1. In this utility model, by setting a detachable filter assembly inside the fuel inlet pipe, and using a structure consisting of a filter plate, a connecting plate, a connecting plate, a fixing ball, a fixing block, and a spring, the filter assembly can be quickly installed and disassembled. This structure ensures the primary filtration effect of the fuel while facilitating the user to clean or replace the filter plate, reducing maintenance difficulty and cost, and improving the practicality and reliability of the fuel pump system. It is suitable for scenarios with high requirements for fuel quality.

[0017] 2. In this utility model, a sealing structure consisting of a fixing ring, a washer, a second washer, and a second spring is provided at the connection between the first and second fuel inlet pipes. A reliable sealing interface is formed at the connection to prevent fuel leakage and improve the sealing performance of the fuel system. The second spring provides axial preload to keep the seal in a tight state, effectively enhancing the sealing effect and ensuring the safe and stable operation of the fuel pump under high pressure or vibration conditions. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a fuel pump inlet structure proposed in this utility model;

[0019] Figure 2 This is a schematic diagram of a portion of the fuel inlet pipe of a fuel pump inlet structure proposed in this utility model.

[0020] Figure 3 for Figure 2 Enlarged view of point A in the image;

[0021] Figure 4 This is a schematic diagram of the exploded structure of the fuel inlet pipe of the fuel pump inlet structure proposed in this utility model;

[0022] Figure 5 This is a schematic diagram of the three-part structure of the fuel inlet pipe of a fuel pump fuel inlet structure proposed in this utility model.

[0023] Legend:

[0024] 1. Outer casing; 2. Oil inlet pipe one; 3. Oil inlet pipe two; 4. Pump body; 5. Fixing plate; 6. Plunger cap; 7. Plunger spring; 8. Threaded connector; 9. Filter plate; 10. Fixing ring; 11. Connecting plate one; 12. Fixing ball; 13. Fixing block; 14. Connecting block one; 15. Spring one; 16. Connecting plate two; 17. Fixing ring; 18. Washer one; 19. Washer two; 20. Spring two; 21. Connecting block two; 22. Flange; 23. Flow buffer. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Reference Figures 1-5The present invention provides an embodiment of a fuel pump inlet structure, including a housing 1, a pump body 4 fixedly connected to the outer wall of the housing 1, the pump body 4 as the core functional component of the fuel pump, responsible for sucking in and pressurizing fuel, and together with the inlet channel to complete the fuel supply task, and is the main working unit of the fuel structure. An inlet pipe 2 3 is fixedly connected to the outer wall of the pump body 4, an inlet pipe 1 2 is fixedly connected to the upper surface of the inlet pipe 2 3, and a filter assembly is provided inside the inlet pipe 1 2.

[0027] The filter assembly includes a filter plate 9, which is located inside the fuel inlet pipe 2 and is the main part of the filter assembly. It can effectively block particulate impurities from entering the structure, extend the life of the fuel pump, and reduce the wear of the fuel injection structure. It belongs to the primary fuel purification unit. The outer wall of the filter plate 9 is slidably connected to the inner wall of the fuel inlet pipe 2. A connecting plate 11 is fixedly connected to the lower surface of the filter plate 9. A fixing ball 12 is fixedly connected to the lower surface of the connecting plate 11. A fixing block 13 is slidably connected to the outer wall of the fixing ball 12. The fixing block 13 and the fixing ball 12 cooperate to form a mechanical limiting structure. By rotating and cooperating with the connecting plate 16, a snap-fit ​​installation is achieved to avoid loosening due to vibration or fluid impact. A connecting block 14 is fixedly connected to the outer wall of the fixing block 13. A spring 15 is fixedly connected to the lower surface of the connecting block 14. One end of the spring 15 is fixedly connected to the connecting plate 16. The connecting plate 16 serves as the lower support of the filter assembly and cooperates with the fixing ring 10, connecting plate 11, and other structures to enhance the stability and sealing of the overall filter structure.

[0028] Reference Figures 1-5A spring 20 is installed inside the oil inlet pipe 23. One end of the spring 20 is connected to a washer 18, and the other end is connected to the bottom of the inner wall of the oil inlet pipe 23. This provides axial preload to the sealing structure, preventing the washer from loosening and enhancing the sealing and tightening effect. One end of the spring 20 is fixedly connected to the washer 18. The outer wall of the washer 18 is fixedly connected to the inner wall of the oil inlet pipe 2. A retaining ring 17 is fixedly connected to the outer wall of the oil inlet pipe 2. A washer 29 is installed on the inner wall of the retaining ring 17, fitting tightly against the washer 18 to form a seal. Reliable sealing, while adapting to temperature and pressure changes in the fuel structure, maintaining the sealing performance at the connection, the outer wall of the fixing ring 17 is fixedly connected to the connecting block 21, the inner wall of the connecting block 21 is threadedly connected to the flange 22, the inner wall of the fuel inlet pipe 23 is fixedly connected to the flow damper 23, the flow damper 23 is installed inside the fuel inlet pipe 23, the flow damper 23 achieves uniform fuel flow rate through structural damping, reduces the generation of air bubbles, and improves the overall structural operational stability and lifespan, the outer wall of the pump body 4 is fixedly connected to the fixing plate 5, the outer wall of the pump body 4 is fixedly connected to the threaded joint 8, the outer wall of the fixing plate 5 is fixedly connected to the... The plunger cap 6 covers and presses against the plunger structure, limiting the plunger's range of motion and providing a clamping and positioning function for the plunger spring 7, ensuring that the plunger assembly maintains an effective seal during reciprocating motion. The plunger spring 7 is sleeved on the outer wall of the plunger cap 6. One end of the plunger spring 7 is fixedly connected to the outer wall of the fixing plate 5, and the other end is fixedly connected to the inner wall of the plunger cap 6. A fixing ring 10 is fixedly connected to the lower surface of the connecting plate 16. The outer wall of the fixing block 13 is rotatably connected to the inner wall of the connecting plate 16. The inner wall of the fixing ring 17 is fixedly connected to the outer wall of the oil inlet pipe 3. Installed on the outer wall of the fuel inlet pipe 2, it is used to install the gasket 19, providing a fixed platform for the sealing structure, enhancing the mechanical stability and sealing reliability of the connection. The other end of the spring 20 is fixedly connected to the bottom of the inner wall of the fuel inlet pipe 3, and the inner wall of the gasket 19 is fixedly connected to the outer wall of the fuel inlet pipe 2. The fixing block 13 is set inside the fuel inlet pipe 2. The fuel inlet pipe 2 serves as the upper part of the fuel entry structure, used to guide the fuel inflow. At the same time, a filter plate 9 is installed inside it for primary filtration, which can effectively intercept larger particulate impurities, improve fuel cleanliness, and protect the pump body 4 and the rear fuel injection structure.

[0029] Working principle: When a fuel pump inlet structure is required, the filter plate 9 is first placed inside the inlet pipe 2. To effectively fix the filter plate 9, a connecting plate 11 is connected to its lower surface. A fixing ball 12 is set below the connecting plate 11. A fixing ring 10 is set at a corresponding position inside the inlet pipe 2. A connecting plate 2 16 is installed on the upper surface of the fixing ring 10. Two arc-shaped fixing blocks 13 are rotatably connected to the upper surface of the connecting plate 2 16. A block 14 is connected to the outer wall of the fixing block 13, and a spring 15 is set below it. One end of the spring 15 is connected to the bottom of the connecting block 14, and the other end is connected to the upper surface of the connecting plate 2 16.

[0030] During installation, pressing the filter plate 9 causes the fixing ball 12 to press down on the fixing block 13. At this time, the spring 15 is compressed, and the fixing ball 12 slides into the fixing block 13, achieving quick fixation. When the filter plate 9 needs to be removed for cleaning or replacement, it can be simply pulled out. The operation is simple. The filter plate 9 can effectively block larger particulate impurities, achieving primary filtration of fuel. Through the cooperation of the connecting plate 11 and the connecting plate 2 16, as well as the limiting effect of the fixing ball 12 and the fixing block 13, the filter assembly has good disassembly, which facilitates cleaning and maintenance, thereby improving the filtration efficiency of the fuel pump structure and reducing maintenance costs.

[0031] In addition, a sealing structure is provided at the connection between fuel inlet pipe 2 and fuel inlet pipe 3 to ensure the sealing and safety of the fuel structure. Specifically, a fixing ring 17 is fixedly connected to the outer wall of fuel inlet pipe 2, and a washer 19 is provided on the inner wall of the fixing ring 17, forming a reliable sealing interface with the washer 18 installed on the inner wall of fuel inlet pipe 3. At the same time, one end of spring 20 is connected to washer 18, and the other end is connected to the bottom of the inner wall of fuel inlet pipe 3, providing axial preload and effectively enhancing the sealing effect. To further improve the fuel flow stability, a flow damper 23 is provided inside fuel inlet pipe 3. The flow damper 23 is used to slow down the fuel flow rate and reduce the generation of air bubbles, ensuring that the device still has good performance under complex working conditions.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fuel pump inlet structure, comprising a housing (1), characterized in that: The outer wall of the outer shell (1) is fixedly connected to a pump body (4), the outer wall of the pump body (4) is fixedly connected to an oil inlet pipe two (3), the upper surface of the oil inlet pipe two (3) is fixedly connected to an oil inlet pipe one (2), and a filter assembly is provided inside the oil inlet pipe one (2). The filter assembly includes a filter plate (9), the outer wall of which is slidably connected to the inner wall of the oil inlet pipe (2), a connecting plate (11) is fixedly connected to the lower surface of the filter plate (9), a fixed ball (12) is fixedly connected to the lower surface of the connecting plate (11), a fixed block (13) is slidably connected to the outer wall of the fixed ball (12), a connecting block (14) is fixedly connected to the outer wall of the fixed block (13), a spring (15) is fixedly connected to the lower surface of the connecting block (14), and a connecting plate (16) is fixedly connected to one end of the spring (15).

2. The fuel pump inlet structure according to claim 1, characterized in that: The oil inlet pipe 2 (3) is equipped with a spring 2 (20), and a washer 1 (18) is fixedly connected to one end of the spring 2 (20). The outer wall of the washer 1 (18) is fixedly connected to the inner wall of the oil inlet pipe 1 (2). A fixing ring (17) is fixedly connected to the outer wall of the oil inlet pipe 1 (2). A washer 2 (19) is provided on the inner wall of the fixing ring (17). A connecting block 2 (21) is fixedly connected to the outer wall of the fixing ring (17). A flange (22) is threadedly connected to the inner wall of the connecting block 2 (21). A flow buffer plate (23) is fixedly connected to the inner wall of the oil inlet pipe 2 (3).

3. The fuel pump inlet structure according to claim 1, characterized in that: A fixing plate (5) is fixedly connected to the outer wall of the pump body (4), and a threaded joint (8) is fixedly connected to the outer wall of the pump body (4).

4. The fuel pump inlet structure according to claim 3, characterized in that: A plunger cap (6) is fixedly connected to the outer wall of the fixed plate (5), and a plunger spring (7) is sleeved on the outer wall of the plunger cap (6).

5. The fuel pump inlet structure according to claim 4, characterized in that: One end of the plunger spring (7) is fixedly connected to the outer wall of the fixed plate (5), and the other end of the plunger spring (7) is fixedly connected to the inner wall of the plunger cap (6).

6. The fuel pump inlet structure according to claim 1, characterized in that: A fixing ring (10) is fixedly connected to the lower surface of the second connecting plate (16), and the outer wall of the fixing block (13) is rotatably connected to the inner wall of the second connecting plate (16).

7. The fuel pump inlet structure according to claim 2, characterized in that: The inner wall of the fixing ring (17) is fixedly connected to the outer wall of the second oil inlet pipe (3), and the other end of the second spring (20) is fixedly connected to the bottom of the inner wall of the second oil inlet pipe (3).

8. The fuel pump inlet structure according to claim 2, characterized in that: The inner wall of the second washer (19) is fixedly connected to the outer wall of the first oil inlet pipe (2), and the fixing block (13) is set inside the first oil inlet pipe (2).

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