Accurate oil supply fuel pump

Abstract

A precise oil supply fuel pump comprises an oil storage barrel, a pump core and a filter, the pump core and the filter are arranged in an inner cavity of the oil storage barrel, an upper cover is arranged on the upper side of a port of the oil storage barrel through a supporting rod, a controller and an oil outlet pipe are arranged on the upper side of the upper cover, and the controller is electrically connected with the pump core; the top of the filter is provided with an oil conveying channel communicated with the pump core and an output port communicated with the oil outlet pipe, the upper cover is provided with an oil pressure sensor on the oil outlet pipe, the oil pressure sensor is electrically connected with the controller, the oil pressure sensor is directly integrated on the oil outlet pipe of the upper cover, and the oil pressure sensor, the controller and the pump core form a closed loop. The oil pressure sensor detects a real-time pressure signal in the oil outlet pipe and feeds back the real-time pressure signal to the controller, the controller generates a control signal according to the difference value between the real-time pressure signal and the preset target pressure, the voltage of the pump core is controlled to change the rotating speed of the pump core to achieve flow adjustment, then the oil pressure in the oil outlet pipe is changed, and the oil supply precision is improved.

Description

Technical Field

[0001] This utility model relates to a fuel pump, and more particularly to a precision fuel supply fuel pump. Background Technology

[0002] The fuel supply system is a core component of modern internal combustion engines, especially electronic fuel injection engines. The accuracy and stability of its fuel supply pressure directly determine the engine's power output, fuel economy, emissions levels, and smoothness of operation. With the continuous advancement of engine technology, the performance requirements for the fuel supply system are becoming increasingly stringent. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a precision fuel pump that accurately regulates fuel supply pressure and provides stable output.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a precision fuel pump, including an oil storage tank and a pump core and a filter disposed in the inner cavity of the oil storage tank. The upper side of the port of the oil storage tank is provided with a top cover by a support rod. The top cover is provided with a controller and an oil outlet pipe. The controller is electrically connected to the pump core. The top of the filter is provided with an oil delivery channel communicating with the pump core and an output port communicating with the oil outlet pipe. The top cover is provided with an oil pressure sensor on the oil outlet pipe. The oil pressure sensor is electrically connected to the controller.

[0005] With the above structure, the oil pressure sensor is directly integrated into the oil outlet pipe of the upper cover, forming a closed loop with the controller and pump core. The oil pressure sensor detects the real-time pressure signal in the oil outlet pipe and feeds it back to the controller. The controller generates a control signal based on the difference between the actual pressure signal and the preset target pressure, controls the voltage of the pump core to change the speed of the pump core to achieve flow regulation, thereby changing the oil pressure in the oil outlet pipe and improving the oil supply accuracy.

[0006] Preferably, the filter is annular and is mounted inside the oil reservoir via a mounting bracket. A lower support is provided at the bottom of the filter, and the pump core is located within the filter's inner cavity. This structure shortens the path of the high-pressure oil after the pump to the filter and output, reduces pipeline volume and pressure pulsation, and provides a physical basis for rapid response and stable pressure.

[0007] Preferably, the filter contains a filter element that divides the filter into an input chamber and an output chamber. The input chamber is located on the outer periphery of the filter element, and the output chamber is located on the inner periphery of the filter element. The fuel delivery channel connects the pump element and the input chamber of the filter. The output port is located at the top of the output chamber of the filter and is connected to the fuel outlet pipe via a first corrugated pipe. This structure ensures that the fuel pumped from the pump element passes evenly and efficiently through the entire annular filter element area, and after filtration, directly enters the internal output chamber, resulting in a short and smooth flow.

[0008] Preferably, the bottom of the filter's output chamber is equipped with a pressure relief valve that communicates with the inner cavity of the oil reservoir. This pressure relief valve is a spring-loaded one-way valve. This structure allows for rapid pressure relief, directly returning the fuel to the oil reservoir, forming an internal small circulation loop, preventing fuel leakage, and protecting the filter and upstream components.

[0009] Preferably, the oil storage tank has an oil inlet at the bottom, and the lower support has a negative pressure cover on the upper side of the oil inlet. A negative pressure nozzle is installed inside the negative pressure cover, and the negative pressure nozzle is connected to the pump core through a second corrugated pipe. An input pipe connecting the inside and outside of the negative pressure cover is located on the negative pressure cover opposite the negative pressure nozzle. Using this structure, the high-pressure fuel output from the pump core is used as a power source to create a localized negative pressure at the oil inlet. This not only improves the fuel suction efficiency but also agitates the fuel at the inlet, dispersing any potentially accumulating air bubbles and actively preventing vapor lock.

[0010] Preferably, the upper cover is also equipped with an intake pressure sensor for detecting air resistance inside the fuel tank, and the intake pressure sensor is electrically connected to the controller. With the above structure, when an abnormal pressure is detected inside the fuel tank, the controller controls the pump core to operate intermittently with pulses or at reduced speed until the pressure returns to normal.

[0011] This invention has the advantages of precise adjustment of oil supply pressure and stable output. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0013] Figure 2 This is a schematic diagram of the structure of the top cover of this utility model;

[0014] Figure 3 This is a schematic diagram of the structure of the filter of this utility model;

[0015] Figure 4 This is a cross-sectional view of the filter of this utility model;

[0016] Figure 5 This is a schematic diagram of the bottom structure of the filter of this utility model;

[0017] Figure 6 This is a cross-sectional view of the negative pressure cover of this utility model.

[0018] In the diagram: 1. Oil reservoir; 2. Pump core; 3. Filter; 4. Support rod; 5. Top cover; 6. Controller; 7. Oil outlet pipe; 8. Oil delivery channel; 9. Output port; 10. Oil pressure sensor; 11. Mounting bracket; 12. Lower bracket; 13. Filter element; 14. First bellows; 15. Pressure relief valve; 16. Oil inlet; 17. Negative pressure cover; 18. Negative pressure nozzle; 19. Second bellows; 20. Input pipe; 21. Inlet air pressure sensor. Detailed Implementation

[0019] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0020] Example: Figures 1 to 6 The illustration shows a precision fuel pump, comprising a fuel tank 1, a pump core 2 and a filter 3 disposed within the inner cavity of the fuel tank 1. A top cover 5 is mounted on the upper side of the fuel tank 1 via a support rod 4. A controller 6 and a fuel outlet pipe 7 are mounted on the upper side of the top cover 5. The controller 6 is electrically connected to the pump core 2. The top of the filter 3 has a fuel delivery channel 8 connecting to the pump core 2 and an output port 9 connecting to the fuel outlet pipe 7. An oil pressure sensor 10 is mounted on the fuel outlet pipe 7 of the top cover 5. The oil pressure sensor 10 is electrically connected to the controller 6, directly integrating the oil pressure sensor 10 at the fuel outlet pipe 7 of the top cover 5, forming a closed loop with the controller 6 and the pump core 2. The oil pressure sensor 10 detects the real-time pressure signal within the fuel outlet pipe 7 and feeds it back to the controller 6. The controller 6 generates a control signal based on the difference between the actual pressure signal and the preset target pressure, controlling the voltage of the pump core 2 to change the rotational speed of the pump core 2 to achieve flow regulation, thereby changing the oil pressure within the fuel outlet pipe 7 and improving fuel supply accuracy.

[0021] The filter 3 is annular and is mounted on the inner cavity of the oil storage tank 1 via a mounting bracket 11. A lower support 12 is provided at the bottom of the filter 3. The pump core 2 is located within the inner cavity of the filter 3, shortening the path of the high-pressure oil after pumping to the filter and output, reducing pipeline volume and pressure pulsation, and providing a physical basis for rapid response and stable pressure. The filter 3 contains a filter element 13, which divides the filter 3 into an input chamber and an output chamber. The input chamber is located on the outer periphery of the filter element 13, and the output chamber is located on the inner periphery of the filter element 13. The oil delivery channel 8 connects... The pump core 2 and filter 3 are connected to the input chamber. The output port 9 is located at the top of the output chamber of the filter 3, so that the fuel pressed out from the pump core 2 can pass through the entire area of ​​the annular filter element 13 evenly and efficiently, and directly enter the internal output chamber after filtration. The flow is short and smooth. The output port 9 is connected to the oil outlet pipe 7 through the first bellows 14. The bottom of the output chamber of the filter 3 is provided with a pressure relief valve 15 that communicates with the inner cavity of the oil storage tank 1. The pressure relief valve 15 is a spring-loaded one-way valve that quickly relieves pressure and directly discharges back to the oil storage tank 1, forming an internal small circulation, avoiding fuel leakage and protecting the filter 3 and upstream components.

[0022] The oil storage tank 1 has an oil inlet 16 at the bottom. The lower support 12 has a negative pressure cover 17 on the upper side of the oil inlet 16. The negative pressure cover 17 has a negative pressure nozzle 18 inside. The negative pressure nozzle 18 is connected to the pump core 2 through a second corrugated pipe 19. The negative pressure cover 17 has an input pipe 20 on the negative pressure cover 17 facing the negative pressure nozzle 18, which connects the inner and outer sides of the negative pressure cover 17. The high-pressure fuel output by the pump core 2 is used as a power source to create a local negative pressure at the oil inlet 16. This not only improves the oil suction efficiency, but also agitates the fuel at the oil inlet 16, disperses any air bubbles that may accumulate, and plays a role in actively preventing vapor lock.

[0023] The upper cover 5 is also equipped with an intake pressure sensor 21 for detecting air resistance in the oil tank. The intake pressure sensor 21 is electrically connected to the controller 6. When an abnormal pressure is detected in the oil tank, the controller 6 controls the pump core 2 to perform intermittent pulse operation or speed reduction operation until the pressure returns to normal.

[0024] 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 precision fuel pump, comprising a fuel tank (1) and a pump core (2) and a filter (3) disposed within the inner cavity of the fuel tank (1), characterized in that: The upper side of the oil storage tank (1) is provided with a cover (5) via a support rod (4). The upper side of the cover (5) is provided with a controller (6) and an oil outlet pipe (7). The controller (6) is electrically connected to the pump core (2). The filter (3) is annular. The filter (3) is installed in the inner cavity of the oil storage tank (1) via a mounting bracket (11). The bottom of the filter (3) is provided with a lower support (12). The pump core (2) is installed in the inner cavity of the filter (3). The top of the filter (3) is provided with an oil delivery channel (8) connecting to the pump core (2) and an output port (9) connecting to the oil outlet pipe (7). The oil storage tank (1) has an oil inlet (16) at the bottom. The lower support (12) has a negative pressure cover (17) on the upper side of the oil inlet (16). The negative pressure cover (17) has a negative pressure nozzle (18) inside. The negative pressure nozzle (18) is connected to the pump core (2) through the second corrugated pipe (19). The negative pressure cover (17) has an input pipe (20) connecting the inside and outside of the negative pressure cover (17) at the position opposite to the negative pressure nozzle (18). The upper cover (5) has an oil pressure sensor (10) on the oil outlet pipe (7). The oil pressure sensor (10) is electrically connected to the controller (6).

2. The precision fuel pump according to claim 1, characterized in that: The filter (3) is provided with a filter element (13), which divides the filter (3) into an input chamber and an output chamber. The input chamber is located on the outer periphery of the filter element (13), and the output chamber is located on the inner periphery of the filter element (13). The oil delivery channel (8) connects the pump core (2) and the input chamber of the filter (3). The output port (9) is located at the top of the output chamber of the filter (3). The output port (9) is connected to the oil outlet pipe (7) through the first corrugated pipe (14).

3. The precision fuel pump according to claim 2, characterized in that: The bottom of the output chamber of the filter (3) is provided with a pressure relief valve (15) that communicates with the inner cavity of the oil storage tank (1). The pressure relief valve (15) is a spring-loaded one-way valve.

4. The precision fuel pump according to claim 1, characterized in that: The upper cover (5) is also provided with an intake pressure sensor (21) for detecting air resistance in the oil tank. The intake pressure sensor (21) is electrically connected to the controller (6).

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