Fuel pump with noise reduction structure

Abstract

A fuel pump with a noise reduction structure comprises a fuel pump body, an oil outlet pipe and a nozzle assembly, the nozzle assembly comprises a nozzle body, an insertion pipe is arranged at the rear end of the nozzle body, an oil inlet hole is formed in the insertion pipe, and a noise reduction cavity communicated with the oil inlet hole is formed in the inner side of the front end of the nozzle body. A valve frame, a valve rod and a valve element are arranged in the noise reduction cavity, the front end of the valve element abuts against an opening of the oil inlet hole, the valve rod is sleeved with a spring, the two ends of the spring abut against the valve frame and the valve element respectively, the valve element can be pushed open through impulsive force of the fuel oil, buffering is conducted through the spring, and therefore the fuel oil can be effectively reduced. Fuel oil can be dispersed and guided along the valve element in a buffering mode to enter the noise reduction cavity, injection is smoother and more stable, pressure pulsation of the fuel oil is effectively attenuated and balanced in the noise reduction cavity, generation of hydrodynamic force noise is weakened fundamentally, and the functions of buffering, noise reduction and a one-way valve are achieved.

Description

Technical Field

[0001] This utility model relates to a fuel pump, and more particularly to a fuel pump with a noise reduction structure. Background Technology

[0002] The fuel pump is a key component of the modern internal combustion engine fuel supply system, its core function being to stably and continuously deliver fuel from the fuel tank to the engine combustion chamber. During fuel pump operation, especially when high-pressure fuel is injected into the engine through the nozzle assembly, the pressure changes and periodic pulsations of the high-pressure fuel within the flow channel generate significant fluid noise. Current fuel pump nozzles are typically designed with a focus on achieving reliable sealing and accurate fuel metering, offering limited measures for controlling operating noise. Common noise reduction methods often involve adding soundproof covers or damping materials to the fuel lines. However, this approach not only increases the system's size and complexity but also only addresses the symptoms, failing to effectively suppress the noise at its source. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a fuel pump with a noise reduction structure that features uniform fuel atomization, compact structure, strong connection, strong sealing performance, and effective noise reduction.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a fuel pump with a noise reduction structure, including a fuel pump body, a fuel outlet pipe for supplying fuel to the engine, a nozzle assembly connected to the fuel outlet pipe, the nozzle assembly including a nozzle body, an insertion tube inserted into the fuel outlet pipe at the rear end of the nozzle body, an oil inlet hole along its axial direction in the insertion tube, a noise reduction cavity in the inner side of the front end of the nozzle body, the noise reduction cavity communicating with the oil inlet hole, a valve bracket in the noise reduction cavity, a valve stem slidingly disposed at the inner end of the valve bracket, a valve core at the end of the valve stem, the front end of the valve core abutting against the opening of the oil inlet hole, a spring sleeved on the valve stem, the two ends of the spring abutting against the valve bracket and the valve core respectively.

[0005] With the above structure, a noise reduction chamber is set in the nozzle body, providing a volumetric buffer and expansion space for high-pressure fuel. By setting a valve stem and valve core, the force of the fuel pushes open the valve core, which is effectively buffered by the spring, thereby reducing the noise generated by its vibration. The fuel will enter the noise reduction chamber through the buffered dispersion guide of the valve core, making the injection smoother and more stable. Its pressure pulsation is effectively attenuated and balanced in the noise reduction chamber, fundamentally reducing the generation of hydrodynamic noise and playing the role of buffering, noise reduction and one-way valve.

[0006] Preferably, a positioning plate extends outward from the rear end of the nozzle body. Several positioning blocks are evenly distributed on the positioning plate along the circumference of the nozzle body. Symmetrically arranged on both sides of the positioning plate are arc-shaped retaining strips that match the nozzle body. Each arc-shaped retaining strip has a fixing groove along its length. The nozzle body is installed and fixed using the arc-shaped retaining strips, positioning blocks, and fixing grooves. This structure, through the composite installation structure formed by the positioning plate, positioning blocks, arc-shaped retaining strips, and fixing grooves, achieves multi-point positioning and rigid locking of the nozzle assembly at the installation interface, resulting in an extremely secure connection. This effectively prevents the nozzle from loosening or making abnormal noises under continuous engine vibration, improving the structural stability of the entire fuel supply system.

[0007] Preferably, the nozzle body is a stepped cylinder with a small front diameter and a large rear diameter, and a sealing ring is fitted between the small diameter end of the nozzle body and the arc-shaped retaining strip.

[0008] Preferably, the outer wall of the insertion tube is provided with several oblique grooves to prevent the insertion tube from falling out of the oil outlet tube. This structure further provides axial anti-dislodgement protection, effectively preventing the nozzle from loosening or making abnormal noises under continuous engine vibration, and improving the structural stability of the entire fuel supply system.

[0009] Preferably, a sealing groove is provided at the connection between the noise reduction cavity and the oil inlet, and the inner end of the sealing groove has an arc-shaped structure.

[0010] Preferably, the valve core has a hemispherical sealing head at its front end. This sealing head abuts against the opening of the oil inlet at the inner end of the sealing groove, and the diameter of the sealing head is smaller than the diameter of the inner end face of the sealing groove. This structure, with its line contact sealing between the arc-shaped sealing groove and the hemispherical sealing head, creates a good line seal or narrow-face seal, reducing the impact force and collision noise when the valve core closes. This achieves dual suppression of fluid and mechanical noise, resulting in a direct and significant noise reduction effect. Furthermore, the fit between the hemispherical sealing head and the arc-shaped sealing groove creates a good line seal or narrow-face seal, which not only provides a sensitive and effective seal but also has a high tolerance for minute impurities in the fuel, reducing the risk of leakage due to impurities and improving the reliability and durability of the nozzle operation.

[0011] Preferably, three mounting strips are evenly arranged along the axial direction on the outer sidewall of the valve frame. Each mounting strip has a plugging ring at its outer end that abuts against the front end face of the nozzle body. Two adjacent mounting strips, the plugging ring, and the valve frame form an injection port. Two adjacent mounting strips, the valve frame, and the inner wall of the noise reduction chamber form an injection channel corresponding to the injection port. With this structure, the valve frame is axially limited by the plugging rings at the ends of the mounting strips, making assembly simple and quick, and facilitating mass production and maintenance. The multiple evenly distributed injection ports formed by the valve frame, mounting strips, and plugging rings allow the fuel to be naturally divided into multiple streams upon injection, improving fuel atomization and promoting fuel-air mixing, which has potential benefits for engine combustion efficiency.

[0012] Preferably, the mounting strip has a snap-fit ​​block on its side wall, and the noise reduction cavity has a snap-fit ​​groove on its inner wall, with the snap-fit ​​block snapping into the snap-fit ​​groove. This structure achieves axial fixation through the cooperation of the snap-fit ​​block and the snap-fit ​​groove, resulting in simple and quick assembly, which is beneficial for mass production and maintenance.

[0013] This invention has the advantages of uniform fuel atomization, compact structure, firm connection, strong sealing performance, and effective noise reduction. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0015] Figure 2 This is a schematic diagram of the nozzle assembly of this utility model;

[0016] Figure 3 This is a cross-sectional view of the nozzle assembly of this utility model;

[0017] Figure 4 This is a schematic diagram of the nozzle body of this utility model;

[0018] Figure 5 This is a structural schematic diagram of the valve holder of this utility model.

[0019] In the diagram: 1. Fuel pump body; 2. Fuel outlet pipe; 3. Nozzle assembly; 4. Nozzle body; 5. Insertion pipe; 6. Fuel inlet; 7. Noise reduction chamber; 8. Valve bracket; 9. Valve stem; 10. Valve core; 11. Spring; 12. Positioning plate; 13. Positioning block; 14. Arc-shaped retaining strip; 15. Fixing groove; 16. Sealing ring; 17. Oblique tooth groove; 18. Sealing groove; 19. Sealing head; 20. Mounting strip; 21. Plug ring; 22. Injection port; 23. Injection channel; 24. Snap-fit ​​block; 25. Snap-fit ​​groove. Detailed Implementation

[0020] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. Example

[0021] like Figures 1 to 5 A fuel pump with a noise reduction structure is shown, comprising a fuel pump body 1, on which a fuel outlet pipe 2 for supplying fuel to the engine is provided, and a nozzle assembly 3 is connected to the fuel outlet pipe 2. The nozzle assembly 3 includes a nozzle body 4, and an insertion tube 5 inserted into the fuel outlet pipe 2 at its rear end. An oil inlet hole 6 is provided axially inside the insertion tube 5. Several oblique toothed grooves 17 are formed on the outer wall of the insertion tube 5 to prevent it from falling out of the fuel outlet pipe 2, further providing axial anti-dislodgement protection and effectively preventing the nozzle from loosening or making abnormal noise under continuous engine vibration, thus improving the structural stability of the entire fuel supply system. A positioning plate 12 extends outward from the rear end of the nozzle body 4. Several positioning blocks 13 are evenly arranged around the nozzle body 4 on the positioning plate 12. Symmetrical positioning blocks 13 are arranged on both sides of the positioning plate 12. The nozzle body 4 is matched with an arc-shaped retaining strip 14. The arc-shaped retaining strip 14 has a fixing groove 15 along its length. When the nozzle body 4 is installed, it is inserted into the fuel pipe and fixed by the arc-shaped retaining strip 14, the positioning block 13, and the fixing groove 15. This realizes multi-point positioning and rigid locking of the nozzle assembly 3 at the installation interface, and the connection is extremely firm. It effectively prevents the nozzle from loosening or making abnormal noise under the continuous vibration of the engine, and improves the structural stability of the entire fuel supply system. The nozzle body 4 is a stepped cylinder with a small front diameter and a large rear diameter. A sealing ring 16 is fitted between the small diameter end of the nozzle body 4 and the arc-shaped retaining strip 14.

[0022] The nozzle body 4 has a noise reduction chamber 7 on its inner front end, which is connected to the oil inlet 6. The noise reduction chamber 7 provides a volumetric buffer and expansion space for high-pressure fuel. The noise reduction chamber 7 has a valve holder 8, and a valve stem 9 is slidably mounted on the inner end of the valve holder 8. The end of the valve stem 9 has a valve core 10, and the front end of the valve core 10 abuts against the opening of the oil inlet 6. A spring 11 is sleeved on the valve stem 9, and the two ends of the spring 11 abut against the valve holder 8 and the valve core 10, respectively. With the valve stem 9 and the valve core 10, the force of the fuel pushes the valve core 10 open, and the spring 11 effectively buffers it, thereby reducing the noise generated by its vibration. The fuel will flow into the noise reduction chamber 7 in a buffered and dispersed manner along the valve core 10, making the injection smoother and more stable. Its pressure pulsation is effectively attenuated and balanced in the noise reduction chamber 7, fundamentally weakening the generation of hydrodynamic noise and playing the role of buffering, noise reduction, and one-way valve.

[0023] A sealing groove 18 is provided at the connection between the noise reduction cavity 7 and the oil inlet 6. The inner end of the sealing groove 18 has an arc-shaped structure. The front end of the valve core 10 is provided with a sealing head 19 with a hemispherical structure. The sealing head 19 abuts against the opening of the oil inlet 6 at the inner end of the sealing groove 18, and the diameter of the sealing head 19 is smaller than the diameter of the inner end face of the sealing groove 18. The line contact sealing form between the arc-shaped sealing groove 18 and the hemispherical sealing head 19 forms a good line seal or narrow surface seal, which reduces the impact force and collision noise when the valve core 10 is closed. It achieves dual suppression of fluid noise and mechanical noise, and the noise reduction effect is direct and significant. In addition, the cooperation between the hemispherical sealing head 19 and the arc-shaped sealing groove 18 forms a good line seal or narrow surface seal. It not only has a sensitive sealing response and good effect, but also has a high tolerance for small impurities in fuel. It is not easy to leak due to impurities, which improves the reliability and durability of the nozzle operation.

[0024] Three mounting strips 20 are evenly arranged axially on the outer sidewall of the valve frame 8. Each mounting strip 20 has a plug ring 21 at its outer end that abuts against the front end face of the nozzle body 4. The valve frame 8 is axially limited by the plug rings 21 at the ends of the mounting strips 20, making assembly simple and quick, and facilitating mass production and maintenance. An injection port 22 is formed between two adjacent mounting strips 20, the plug rings 21, and the valve frame 8. A corresponding injection channel is formed between two adjacent mounting strips 20, the valve frame 8, and the inner wall of the noise reduction cavity 7. The injection channel 23 and injection port 22 enable the fuel to be naturally divided into multiple streams when injected, which helps to improve the fuel atomization effect, promotes the mixing of fuel and air, and has potential benefits for the combustion efficiency of the engine. The mounting strip 20 has a snap-fit ​​block 24 on its side wall, and the noise reduction cavity 7 has a snap-fit ​​groove 25 on its inner wall. The snap-fit ​​block 24 snaps into the snap-fit ​​groove 25, and the axial fixation is achieved through the cooperation of the snap-fit ​​block 24 and the snap-fit ​​groove 25. The assembly is simple and quick, which is conducive to mass production and maintenance.

[0025] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A fuel pump with a noise reduction structure, comprising a fuel pump body (1), wherein the fuel pump body (1) is provided with a fuel outlet pipe (2) for supplying fuel to the engine, characterized in that: The oil outlet pipe (2) is connected to a nozzle assembly (3). The nozzle assembly (3) includes a nozzle body (4). The nozzle body (4) has an insertion tube (5) inserted into the oil outlet pipe (2) at its rear end. The insertion tube (5) has an oil inlet hole (6) along its axial direction. The nozzle body (4) has a noise reduction chamber (7) on its inner side at the front end. The noise reduction chamber (7) is connected to the oil inlet hole (6). The noise reduction chamber (7) has a valve frame (8). The valve frame (8) has a valve stem (9) slidingly attached to its inner end. The valve stem (9) has a valve core (10) at its end. The front end of the valve core (10) abuts against the opening of the oil inlet hole (6). A spring (11) is sleeved on the valve stem (9). The two ends of the spring (11) abut against the valve frame (8) and the valve core (10) respectively.

2. The fuel pump with a noise reduction structure according to claim 1, characterized in that: The nozzle body (4) has a positioning plate (12) extending outward from the rear end. Several positioning blocks (13) are evenly arranged on the positioning plate (12) along the circumference of the nozzle body (4). Arc-shaped retaining strips (14) matching the nozzle body (4) are symmetrically arranged on both sides of the positioning plate (12). The arc-shaped retaining strips (14) have a fixing groove (15) along their length. The nozzle body (4) is installed and fixed by the arc-shaped retaining strips (14), positioning blocks (13), and fixing grooves (15) during installation.

3. The fuel pump with a noise reduction structure according to claim 2, characterized in that: The nozzle body (4) is a stepped cylinder with a small front diameter and a large rear diameter. A sealing ring (16) is fitted between the small diameter end of the nozzle body (4) and the arc-shaped retaining strip (14).

4. The fuel pump with a noise reduction structure according to claim 1, characterized in that: The outer wall of the insertion tube (5) is provided with several oblique grooves (17) to prevent the insertion tube (5) from falling out of the oil outlet tube (2).

5. The fuel pump with a noise reduction structure according to claim 1, characterized in that: The noise reduction cavity (7) and the oil inlet (6) are connected by a sealing groove (18), and the inner end of the sealing groove (18) is an arc-shaped structure.

6. The fuel pump with a noise reduction structure according to claim 5, characterized in that: The valve core (10) has a sealing head (19) with a hemispherical structure at its front end. The sealing head (19) abuts against the opening of the oil inlet hole (6) at the inner end of the sealing groove (18), and the diameter of the sealing head (19) is smaller than the diameter of the inner end face of the sealing groove (18).

7. The fuel pump with a noise reduction structure according to claim 1, characterized in that: Three mounting strips (20) are evenly arranged along the axial direction on the outer side wall of the valve frame (8). The outer end of the mounting strip (20) is provided with a plug ring (21) that abuts against the front end face of the nozzle body (4). An injection port (22) is formed between two adjacent mounting strips (20), the plug ring (21), and the valve frame (8). An injection channel (23) corresponding to the injection port (22) is formed between two adjacent mounting strips (20), the valve frame (8), and the inner wall of the noise reduction cavity (7).

8. The fuel pump with a noise reduction structure according to claim 7, characterized in that: The mounting strip (20) has a snap-fit ​​block (24) on its side wall, and the noise reduction cavity (7) has a snap-fit ​​groove (25) on its inner wall. The snap-fit ​​block (24) is snapped into the snap-fit ​​groove (25).

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