TWM632526U - Oil fuel pump structure - Google Patents

Abstract

The invention relates to a fuel pump structure, which is accommodated in a storage space of a fuel tank, and includes a motor impeller, a fuel pipeline, a pressure regulating valve, a flow meter and a control unit. The motor impeller includes an oil inlet and an oil outlet, and the oil inlet is provided with a filter and communicated with the accommodating space. The fuel pipeline is connected with the oil outlet and a fuel injector. The pressure regulating valve is connected to the oil outlet to adjust the fuel oil pressure in the fuel pipeline. The flow meter communicates with the pressure regulating valve and the accommodation space, and is used to detect the fuel flow flowing out of the pressure regulating valve. The control unit is electrically connected to the flow meter and the motor impeller to monitor the change of the fuel flow of the flow meter and the rotation speed of the motor impeller. In this way, the invention can control the rotation speed of the motor impeller, thereby reducing the loss of the motor impeller and improving the durability.

Description

Fuel pump structure

This creation relates to a fuel pump structure, especially a fuel pump structure suitable for fuel vehicles.

With the increasingly stringent requirements on the durability of parts, reducing the wear and tear of parts and advocating energy saving and environmental protection are one of the important issues at present. The link that can be discussed is that the fuel pump of a fuel-fueled vehicle must continue to operate during driving to maintain a certain pressure in the oil path from the fuel pump to the injector. However, due to the large mechanical friction loss caused by long-term operation, The durability of the parts is thus relatively low.

The main function of the known fuel pump is to deliver the fuel from the fuel tank to the fuel injector, which consists of a filter screen, a pressure regulating valve, etc. After the vehicle switch is turned on, the battery supplies power to the fuel pump. At this time, the impeller in the fuel pump operates to pump fuel continuously, so that the oil circuit between the fuel pump and the injector maintains a certain pressure value, and the excess Fuel will flow from the pressure regulator valve back into the fuel tank. Because the fuel oil pressure required by the vehicle is not constant, but the conventional fuel pump has no control mechanism for the fuel oil pressure, so that the impeller in the fuel pump is constant for a long time to meet the maximum fuel oil pressure required by the vehicle. Higher rotation speed actuates, and greatly affects its durability.

This is the reason why the creator is based on the spirit of active creation, and eagerly thought of a fuel pump structure that can solve the above problems. After several researches and experiments, this creation was finally completed.

The main purpose of this creation is to provide a fuel pump structure. The motor impeller is used to pump fuel to maintain a certain pressure value in the oil circuit between the fuel pump and the fuel injection nozzle, and the excess fuel will be discharged from the pressure regulating valve. After flowing through the flowmeter, it returns to the fuel tank. The flowmeter is used to detect the flow of fuel flowing out of the pressure regulating valve, and the control unit monitors the change of the fuel flow rate of the flowmeter and the rotation speed of the motor impeller, and adjusts the rotation of the motor impeller. Speed, providing fuel oil pressure that meets the driving needs to reduce the friction loss of the motor impeller, which can effectively improve the durability of the motor impeller or reduce the power consumption. This fuel pump structure is the optimized design of fuel pump.

In order to achieve the above purpose, the fuel pump structure of the present invention is accommodated in an accommodating space of a fuel tank for pumping the fuel stored in the accommodating space of the fuel tank, wherein the fuel pump structure includes a motor impeller, a Fuel line, a pressure regulating valve, a flow meter and a control unit. The motor impeller includes an oil inlet and an oil outlet. The oil inlet is provided with a filter and communicates with the accommodation space. The motor impeller is actuated to filter the fuel through the filter and then pump it to the oil outlet. The fuel pipeline communicates with the fuel outlet and a fuel injection nozzle, and is used for delivering fuel from the fuel outlet to the fuel injection nozzle for use by the engine of the fuel-fueled vehicle. The pressure regulating valve is connected to the oil outlet to adjust the fuel oil pressure in the fuel pipeline. The flow meter communicates with the pressure regulating valve and the accommodation space, and is used to detect the fuel flow flowing out of the pressure regulating valve. The control unit is electrically connected to the flow meter and the motor impeller to monitor the change of the fuel flow of the flow meter and the rotation speed of the motor impeller. Therefore, the fuel pump structure of this invention can adjust the rotation speed of the motor impeller to reduce the friction loss of the motor impeller, thereby improving the durability.

In the fuel pump structure of this invention, when the fuel flow detected by the flowmeter is greater than a threshold upper limit, the control unit can reduce the rotation speed of the motor impeller to meet the fuel oil pressure required by the vehicle. Under certain circumstances, the friction loss of the motor impeller is reduced and the durability is improved. When the fuel flow detected by the flowmeter is less than a threshold lower limit, the control unit can increase the rotation speed of the motor impeller to avoid insufficient fuel oil pressure and cause problems in engine fuel supply.

The above control unit can monitor, but not limited to, the change of the flow rate of the flow meter and the rotation speed of the motor impeller with a software program, so as to optimize the fuel supply situation of the fuel pump.

The above overview and the following detailed description are all exemplary in order to further illustrate the patent scope of the invention. Other purposes and advantages of this creation will be explained in subsequent descriptions and illustrations.

Please refer to Fig. 1, which is a sectional view of the fuel pump structure of a preferred embodiment of the invention. The figure shows a fuel pump structure 1 , which is accommodated in an accommodating space 101 of a fuel tank 10 for pumping fuel stored in the accommodating space 101 of the fuel tank 10 . Wherein, the fuel pump structure 1 includes a motor impeller 2 , a fuel pipeline 3 , a pressure regulating valve 4 , a flow meter 5 and a control unit 6 .

In this embodiment, the motor impeller 2 includes an oil inlet 21 and an oil outlet 22. The oil inlet 21 is provided with a filter screen 20 and communicates with the accommodating space 101. By the action of the motor impeller 2, the fuel After filtering through the filter screen 20, it is pumped to the oil outlet 22. The fuel pipeline 3 communicates with the fuel outlet 22 and a fuel injector (not shown), and is used for delivering fuel from the fuel outlet 22 to the fuel injector (not shown) for use by the engine of a fuel-fueled vehicle. The pressure regulating valve 4 communicates with the oil outlet 22 for adjusting the fuel oil pressure in the fuel pipeline 3 . The flow meter 5 communicates with the pressure regulating valve 4 and the accommodating space 101 for detecting the flow of fuel flowing out of the pressure regulating valve 4 . The control unit 6 is electrically connected to the flow meter 5 and the motor impeller 2, and monitors the fuel flow change of the flow meter 5 and the rotation speed of the motor impeller 2 through a built-in software program 61 . In this way, the fuel pump structure 1 of this embodiment can detect the fuel flow flowing out of the pressure regulating valve 4 through the flowmeter 5, and use the control unit 6 to change the fuel flow rate of the flowmeter 5 and the rotation speed of the motor impeller 2 Monitor and adjust the rotation speed of the motor impeller 2 to provide the fuel oil pressure required by fuel vehicles to reduce the friction loss of the motor impeller 2, which can effectively improve the durability of the motor impeller 2 or reduce the power consumption.

In this embodiment, when the fuel flow detected by the flow meter 5 is greater than a threshold upper limit, the control unit 6 can reduce the rotation speed of the motor impeller 2 to satisfy the fuel oil pressure required by the vehicle. Next, reduce the friction loss of the motor impeller 2 and improve its durability. When the fuel flow detected by the flowmeter 5 is less than a threshold lower limit, the control unit 6 can increase the rotation speed of the motor impeller 2 to avoid insufficient fuel oil pressure and cause problems in engine oil supply.

To sum up, the fuel pump structure of this invention can adjust the rotation speed of the motor impeller while maintaining the fuel oil pressure required by the fuel vehicle, so as to reduce the friction loss of the motor impeller, thereby improving the durability of the motor impeller.

The above-mentioned embodiments are only examples for convenience of description, and the scope of rights claimed in this creation should be subject to the scope of the patent application, rather than limited to the above-mentioned embodiments.

1: Fuel pump structure 10: fuel tank 101:Accommodating space 2: Motor impeller 20: filter screen 21: oil inlet 22: oil outlet 3: Fuel pipeline 4: Pressure regulating valve 5: flow meter 6: Control unit 61:Software program

Fig. 1 is a cross-sectional view of a fuel pump structure of a preferred embodiment of the invention.

1: Fuel pump structure

10: fuel tank

101:Accommodating space

2: Motor impeller

20: filter screen

21: oil inlet

22: oil outlet

3: Fuel pipeline

4: Pressure regulating valve

5: flow meter

6: Control unit

61:Software program

Claims (4)

A fuel pump structure accommodated in one of the accommodating spaces of a fuel tank, including: A motor impeller, including an oil inlet and an oil outlet, the oil inlet is provided with a filter and communicates with the accommodating space; a fuel pipeline, which communicates with the fuel outlet and a fuel injector; A pressure regulating valve, connected to the oil outlet, used to adjust the fuel oil pressure in the fuel pipeline; A flow meter, connected to the pressure regulating valve and the accommodation space, is used to detect the flow of fuel flowing out of the pressure regulating valve; and A control unit is electrically connected to the flow meter and the motor impeller to monitor the fuel flow change of the flow meter and the rotation speed of the motor impeller. The fuel pump structure according to claim 1, wherein when the fuel flow detected by the flow meter is greater than a threshold upper limit, the control unit reduces the rotation speed of the motor impeller. The fuel pump structure as claimed in claim 1, wherein when the fuel flow detected by the flow meter is less than a lower threshold value, the control unit increases the rotational speed of the motor impeller. The fuel pump structure according to claim 1, wherein the control unit uses a software program to monitor the flow change of the flow meter and the rotation speed of the motor impeller.

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