CN102108922B - Electric fuel pump - Google Patents

Abstract

The invention provides an electric fuel pump, which includes a motor, a pump body and a casing. Its pump body includes a primary oil suction system and a secondary oil suction system; the primary oil suction system consists of a primary oil inlet plate and an impeller, and the secondary oil suction system consists of an oil outlet plate, secondary oil absorption plate and pump base; the primary oil absorption system is fixed together with the secondary oil absorption system by a riveting ring; the oil outlet of the primary oil absorption system is connected with a bellows, and the bellows is connected to the fuel pump main body through a three-way pipe. On the bottom barrel and the fuel filter, the bellows are further connected to the oil suction port of the secondary oil suction system of the pump body through the filter. The present invention uses a two-stage oil suction system to decompose the flow rate of the oil pump, increase the oil suction speed, and reduce the vibration and noise of the fuel pump, and the fuel filter is arranged outside the fuel tank of the automobile, which is also convenient for cleaning and replacement.

Description

An electric fuel pump

technical field

The invention relates to an automobile component, in particular to an automobile electric fuel pump.

Background technique

The electric fuel pump is the core part of the fuel pump assembly, which is responsible for providing fuel with a certain pressure for the automotive fuel system. The current automobile electric fuel pump relies on the permanent magnet motor to drive the pump body to rotate at high speed to suck the fuel from the fuel tank, flow through the inside of the electric fuel pump, and then press the fuel out to supply fuel to the fuel system.

Electric fuel pumps of the prior art generally only have a primary oil suction system. When working, the motor rotates to drive the fuel pump to suck the fuel from the oil inlet at the bottom of the pump to the cavity where the impeller or gear of the fuel pump is located, and then discharge it after being pressurized by the impeller or gear. In the prior art, there is only an electric fuel pump with a first-stage oil suction system. Due to the large flow pulsation of the oil pump, the vibration and noise of the fuel pump are relatively large.

In the prior art, the fuel filter screen and the electric fuel pump are installed together on the bottom shell of the automobile fuel tank, and then the fuel tank cap and the fuel tank cover gasket are used to press it tightly in the fuel tank, so that the fuel filter screen is blocked. Replacement is very difficult.

Contents of the invention

There are two technical problems to be solved in the present invention. The first is that the electric fuel pump in the prior art has only one-stage oil suction system. Due to the large flow pulsation of the oil pump, the vibration and noise of the fuel pump are relatively large; the second is that the fuel pump in the prior art The filter screen is installed in the fuel tank and is difficult to replace. In order to solve the above-mentioned technical problems, the present invention provides an electric fuel pump with a two-stage oil suction system, so that the flow of the fuel pump is stable and the noise is low; and the fuel filter is arranged outside the fuel tank of the automobile, which is easy to replace.

In order to achieve the above object, the technical solution adopted in the present invention is to provide an electric fuel pump, which includes a motor, a pump body, and a casing, and the motor and the pump body are arranged in the casing of the fuel pump; the pump body It includes a primary oil absorption system and a secondary oil absorption system; the primary oil absorption system includes a primary oil inlet plate and an impeller; the impeller is fixedly assembled with the main shaft of the fuel pump motor rotor; the secondary oil absorption system includes an oil outlet plate, Secondary oil-absorbing plate and pump base; the inner ring of the pump and the outer ring of the pump are arranged between the oil outlet plate and the second-stage oil-absorbing plate, the inner ring of the pump is assembled with the rotor of the fuel pump motor, and the pump Rollers are arranged between the inner ring and the outer ring of the pump; the secondary oil-absorbing plate is assembled through the gap between the bearing and the main shaft of the rotor of the fuel pump motor; there is a gap between the pump base and the main shaft of the rotor of the fuel pump motor; The oil outlet plate, the outer ring of the pump, and the secondary oil absorption plate are sequentially fixed on the pump base by screws; the primary oil inlet plate and the impeller of the primary oil absorption system are fixed on the pump base by riveting rings; The pump base is provided with a primary oil outlet channel and a secondary oil inlet channel; the oil outlet of the primary oil suction system communicates with the primary oil outlet channel on the pump base, and the primary oil outlet channel on the pump base The channel is connected with a bellows, and the bellows is connected to the secondary oil inlet channel on the base of the pump.

Further, the bellows is connected with a three-way pipe; one end of the three-way pipe is connected to the bottom barrel of the fuel pump assembly, and the other end of the three-way pipe is connected with a fuel filter; the other end of the bellows passes through The fuel filter is connected to the secondary inlet passage on the base of the pump.

Further, the fuel filter is arranged outside the fuel tank of the car.

The working principle of the present invention is that when the electric fuel pump is energized, the motor drives the impeller of the primary oil suction system of the pump body and the inner ring of the pump body of the secondary oil suction system to rotate at high speed; In the lower oil chamber; pressurized by the impeller, the fuel is delivered from the primary oil outlet channel of the pump base to the bellows; when the fuel flows through the three-way pipe, part of the fuel flows back to the bottom barrel of the fuel pump assembly, and the other part of the fuel It flows into the fuel filter connected to the outside of the fuel tank of the car; after being filtered by the fuel filter, it passes through the secondary oil inlet channel of the pump base and flows into the upper oil chamber composed of the pump base and the secondary oil absorption plate; through the pump body With the pressurization of the ring, the fuel pump flows out from the oil outlet plate to complete a pumping process.

In the present invention, the oil outlet plate and the secondary oil absorption plate can be made of ceramic materials, which reduces the wear of the inner ring of the pump and prolongs the service life of the fuel pump. In the present invention, a part of the fuel always flows back to the bottom barrel of the fuel pump assembly, and this part of the fuel acts as a jet to keep the bottom barrel of the fuel pump assembly full; The bottom barrel of the assembly absorbs oil and sends it to the vehicle's oil supply system to ensure the stable operation of the vehicle. In addition, the fuel is filtered by the filter, making the fuel more pure and ensuring the quality of the fuel; and after being pressurized by the impeller, the fuel entering the upper oil chamber has a certain pressure, which increases the speed of the second oil absorption. The fuel filter of the present invention is arranged outside the fuel tank of the automobile, and it is also very convenient to replace and use.

Compared with the prior art, the present invention has positive and obvious effects. By adopting a two-stage oil suction system, the flow rate of the oil pump is broken down, the oil absorption speed is increased, and the vibration and noise of the fuel pump are reduced; the fuel filter is also installed outside the fuel tank of the car, which provides convenience for cleaning and replacement.

Description of drawings

Fig. 1 is the structural representation of electric fuel pump of the present invention;

Fig. 2 is a schematic diagram of the pump body structure of the electric fuel pump of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Fig. 1 is a schematic structural diagram of the electric fuel pump of the present invention. The invention includes a motor and a pump body, and both the pump body and the motor are arranged in the casing of the fuel pump.

As shown in Figure 2, it is a schematic diagram of the structure of the pump body of the present invention, the primary oil-absorbing plate 1 and the impeller 2 form the primary oil-absorbing system, and the impeller 2 is fixedly assembled on the main shaft of the motor rotor 15; the primary oil-absorbing plate 1 and the impeller 2 pass through the riveting ring 10 Riveted on the pump base 5. The oil outlet plate 3, the pump inner ring 6, the pump outer ring 7, the secondary oil absorption plate 4 and the pump base 5 form a secondary oil absorption system. The pump inner ring 6 and the motor rotor 15 are assembled together, and a roller 9 is arranged between the pump inner ring 6 and the pump outer ring 7; the secondary oil-absorbing plate 4 is assembled through the gap between the graphite bearing 14 and the main shaft 16 of the motor rotor 15; Plate 3, pump outer ring 7, and secondary oil-absorbing plate 4 are sequentially fixed on pump base 5 by screws 8.

As shown in Figure 1, there is a gap between the pump base 5 and the main shaft 16 of the motor rotor 15, and the pump base 5 is provided with a primary oil outlet channel 11 and a secondary oil inlet channel 12; the primary oil outlet channel 11 and the primary oil suction system the primary oil outlet channel 11 is connected with a bellows 13, and the bellows 13 is connected with a three-way pipe, one end of the three-way pipe is connected with the bottom barrel of the fuel pump assembly, and the other end of the three-way pipe is connected with a fuel filter The bellows 13 is connected to the secondary oil inlet channel 12 through the fuel filter.

During the working process, when the electric fuel pump is energized, the motor rotor 15 drives the impeller 2 of the primary oil suction system of the pump body, and the inner ring 6 of the pump body of the secondary oil suction system to rotate at high speed; the rotation of the impeller 2 sucks fuel from the fuel tank through the primary oil inlet plate 1 and the lower oil cavity formed by the pump base 5; pressurized by the impeller 2, the fuel is delivered to the bellows 13 through the primary oil outlet channel 11 of the pump base 5; when the fuel flows through the three-way pipe, part of the fuel flows back to the bottom barrel of the fuel pump assembly, and another part of the fuel flows into the fuel filter connected to the outside of the automobile fuel tank; after being filtered by the fuel filter, it passes through the secondary oil inlet passage 12 of the pump base 5, and flows into the pump base and the secondary oil inlet channel 12 In the oil chamber formed by the stage oil-absorbing plate; through the pressurization of the pump inner circle 6, the fuel pump flows out from the oil outlet plate 3, and completes an oil pumping process.

In addition, the height of the roller 9 and the inner ring 6 of the pump are the same, and the inner ring 6 of the pump is 0.01mm lower in the axial direction than the outer ring 7 of the pump, and 0.02mm smaller in the radial direction, so that the inner ring 6 of the pump can rotate flexibly in the outer ring 7 of the pump; , the outer diameter of the impeller 2 is 0.5 mm smaller than the inner diameter of the pump base 5, and the thickness of the impeller 2 is 0.2 mm lower than the inner diameter of the pump base 5.

Claims (2)

1. An electric fuel pump, which includes a motor, a pump body, and a casing, and the motor and the pump body are arranged in the casing of the fuel pump; it is characterized in that, the described pump body includes a primary oil suction system and a secondary oil suction system The primary oil suction system includes a primary oil inlet plate and an impeller; the impeller is fixedly assembled with the main shaft of the fuel pump motor rotor; the secondary oil suction system includes an oil outlet plate, a secondary oil suction plate, and a pump base; The inner ring of the pump and the outer ring of the pump are arranged between the oil outlet plate and the secondary oil absorption plate, the inner ring of the pump is assembled with the rotor of the fuel pump motor, and the inner ring of the pump and the outer ring of the pump are arranged There are rollers; the secondary oil-absorbing plate is assembled through the gap between the bearing and the main shaft of the fuel pump motor rotor; there is a gap between the pump base and the main shaft of the fuel pump motor rotor; the oil outlet plate, the pump body The primary oil inlet plate and the impeller of the primary oil absorption system are fixed on the pump base through riveting rings; the pump base is provided with primary The oil outlet channel and the secondary oil inlet channel; the oil outlet of the primary oil suction system communicates with the primary oil outlet channel on the pump base, and the primary oil outlet channel on the pump base is connected with a bellows, and the The bellows is connected to the secondary oil inlet passage on the pump base; the bellows is connected with a three-way pipe; one end of the three-way pipe is connected with the bottom barrel of the fuel pump assembly, and the other end of the three-way pipe is connected with a fuel filter cleaner; the bellows is connected to the secondary oil inlet channel through the fuel filter. 2. An electric fuel pump according to claim 1, characterized in that: said fuel filter is arranged outside the fuel tank of the automobile.

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