High-pressure fuel pump assembly

Abstract

The utility model provides a high-pressure fuel pump assembly. The high-pressure fuel pump assembly is mainly composed of a shell, a transmission shaft, a cam, a plunger, a spring, a suction valve, an extrusion valve and the like. A suction valve and an extrusion valve are mounted on the shell, a rotatable eccentric transmission shaft is mounted in the shell, and a cam is arranged on one side of the transmission shaft; a plunger perpendicular to the transmission shaft is installed in the shell and can horizontally move in the shell, a return spring is installed at one end of the plunger, a return sleeve is installed at the other end of the plunger and is in contact connection with a cam, and in the rotation process of the transmission shaft, the plunger is pushed by the cam to move, and the plunger is automatically reset through the return spring. And the suction valve and the extrusion valve are correspondingly opened and closed to suck and discharge oil. The utility model has the advantages of simple structure, high pressure, impact resistance, high reliability and the like. Therefore, the piston engine can be widely applied to piston engines of small aircrafts, such as unmanned aerial vehicles, multifunctional transport aircrafts and small official aircrafts.

Description

TECHNICAL FIELD

[0001] The utility model relates to a radial plunger pump, in particular to a high pressure fuel pump assembly. BACKGROUND

[0002] The high pressure fuel pump is a radial plunger pump, and the plunger is arranged perpendicularly to the transmission shaft, that is, arranged along the radial direction. Such a plunger pump has the advantages of simple structure, high pressure, impact resistance, high reliability, etc. Therefore, the plunger pump is widely used in the piston engine of a small airplane, such as a drone, a multi-functional transport plane, a small business plane, etc. For example, in the paper "Research on an Axial Flow Radial Plunger Pump", some improvements are made on the structure of the axial flow radial plunger pump in view of the deficiencies of the axial flow radial plunger pump in application, and the performance of the new axial flow radial plunger pump is researched. However, the high pressure fuel pump described in the paper has a complex structure and low reliability, and cannot meet the market demand. Therefore, it is of great significance to design a high pressure fuel pump with a simple structure and high reliability. SUMMARY

[0003] The utility model discloses a high pressure fuel pump assembly, and the fuel pump adopts the structure form of a radial plunger pump, has the advantages of simple structure, high pressure, impact resistance, high reliability, etc.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical utility model:

[0005] A high pressure fuel pump assembly, comprising a shell, the shell is installed with suction valve and pressure outlet valve, its inside is installed with rotatable eccentric transmission shaft, the transmission shaft one side is equipped with cam, the shell inside is installed with the plunger that is perpendicular to transmission shaft distribution, the plunger can move horizontally in the shell, the plunger one end is installed with return spring, the other end is installed with return sleeve, and is in contact with the cam connection, the transmission shaft rotates in the process, through the cam and pushes the plunger movement, through return spring and makes the plunger automatic reset, and the suction valve and pressure outlet valve open and close correspondingly, carry out oil absorption and oil discharge, and continuously output high pressure fuel oil to the system.

[0006] Preferably, the shell is installed with an oil suction valve seat and an oil outlet valve seat, which limit the suction valve and the pressure outlet valve respectively.

[0007] Preferably, the suction valve is a cone valve, which is installed in the oil suction valve seat and adopts a cylindrical surface guide, so that the guide is accurate and the sealing performance is good.

[0008] Preferably, the pressure outlet valve is a ball valve, which is light in weight, high in hardness and strong in wear resistance.

[0009] Preferably, the pressure outlet valve is made of ceramic material.

[0010] Preferably, the transmission shaft is installed in the shell through a sliding bearing, the sliding bearing is in interference fit with the shell; a sliding type composite bearing is used, thereby reducing the friction coefficient and prolonging the service life.

[0011] Preferably, the transmission shaft is installed in the shell through a sliding bearing, the sliding bearing is in interference fit with the shell; a sliding type composite bearing is used, thereby reducing the friction coefficient and prolonging the service life.

[0012] Preferably, the transmission shaft is installed in the shell through a sliding bearing, the sliding bearing is in interference fit with the shell; a sliding type composite bearing is used, thereby reducing the friction coefficient and prolonging the service life.

[0013] Compared with the prior art, the utility model has the remarkable advantages that:

[0014] (1) the plunger, the cam and the like in the utility model are subjected to film coating treatment, the pressure outlet valve is replaced by a ceramic ball from a traditional steel ball, the wear resistance of each part is improved through the above measures, and the service life of the high-pressure fuel pump is prolonged.

[0015] (2) the high-pressure fuel pump has the advantages of simple structure, high pressure, impact resistance and high reliability.

[0016] The utility model will be further described in detail below with reference to the drawings. DRAWINGS

[0017] Fig. 1 is the structure schematic diagram of a high-pressure fuel pump assembly of the utility model.

[0018] Fig. 2 is the schematic diagram of the eccentric transmission shaft.

[0019] Fig. 3 is the schematic diagram of the eccentric cam. CONCRETE IMPLEMENTING METHOD

[0020] The utility model will be further described in detail below with reference to the drawings.

[0021] Combined Figs. 1-3 , a high-pressure fuel pump assembly mainly comprises a shell (1), a transmission shaft (2), a cam (3), a plunger (4), a return spring (5), a suction valve (6), a pressure outlet valve (7), a suction valve seat (8), a sliding bearing (9), an oil outlet valve seat (10), a return sleeve (11) and the like. The sliding bearing (9) is in interference fit with the shell (1), and the transmission shaft (2) can rotate freely in the bearing (9). The plunger (4) and the return sleeve (11) are installed in the hole of the shell (1) and are arranged perpendicularly to the transmission shaft (2) and can reciprocate freely. The transmission shaft (2) is of an eccentric structure, and a protruding portion is arranged on the transmission shaft (2), for example, Fig. 2With the cam (3) together, form similar crank slider structure. With the rotation of the transmission shaft, and under the action of return spring (5), the plunger (4) moves to the right, the cavity forms negative pressure, oil from the suction valve (6) into the cavity inside, complete oil absorption;Plunger rely on spring return, ensure the normal suction of the pump. Suction valve seat (8) is fixed by thread coupling on the shell (1), the suction valve (6) is limited. Suction valve (6) is in the form of a cone valve, installed in the valve seat (8), using cylindrical surface guide, so the guide is accurate, good sealing, can reduce the leakage of the pump, improve the volumetric efficiency. Transmission shaft (2) turns a half circle, cam (3) drive plunger (4) to overcome the oil pressure and move to the left, the oil pressure in the cavity rises, from the pressure out valve (7), oil outlet valve seat (10) discharge high pressure oil. Oil outlet valve seat (10) is fixed by thread coupling on the shell (1), the pressure out valve (7) is limited, pressure out valve (7) is ball valve, good sealing, simple to manufacture. Fig. 3 , can in turn push three plunger (4) realize oil absorption and oil discharge, so as to continuously to the system input high pressure oil.

[0022] High pressure fuel pump by cam to push plunger movement, rely on return spring to make the plunger reset automatically, suction valve and pressure out valve open and close accordingly, realize oil absorption and oil discharge function, continuously to the system output high pressure fuel.

[0023] The cam (3), plunger (4) and other working surface are plated, which reduces the friction coefficient and improves the wear resistance of the parts. The sliding type composite bearing (9) is pressed into the shell (1) to support the rotation of the transmission shaft (2), which improves the self-lubricating property of the friction pair and effectively reduces the friction coefficient. The pressure out ball valve (7) is made of ceramic material, which not only improves the wear resistance, but also reduces the weight and inertia, so as to ensure timely opening and closing, reduce the lag impact and vibration. Through the above surface treatment and the application of new materials, the reliability of the high pressure fuel pump is improved, and the service life is prolonged.

[0024] The high pressure fuel pump in the utility model is a radial plunger pump, the plunger is arranged perpendicular to the transmission shaft, i.e. arranged along the radial direction, the rotation of the eccentric transmission shaft is utilized to drive the cam, the plunger is pushed to absorb and discharge oil, the fuel is pressurized and then sent to the engine, and the high pressure fuel pump has the advantages of simple structure, high pressure, impact resistance, high reliability and the like. Therefore, the high pressure fuel pump is widely applied to small aircraft piston engines, such as unmanned aerial vehicles, multi-functional transport aircrafts, small business aircrafts and the like.

[0025] It is to be explained that the utility model does not elaborate other structures inside high pressure fuel pump, is regarded as using known structure. The above-mentioned explanation is only detailed explanation to one preferable implementation of the utility model, and does not constitute the limitation of the protection scope of the utility model. Any modification, equivalent replacement and improvement etc. in the spirit and principle of the utility model should be contained in the protection scope of the utility model claim.

Claims

1. A high pressure fuel pump assembly comprising a housing, characterized by, The shell is provided with suction valve and pressure valve, and rotatable eccentric transmission shaft is arranged in the shell, one side of the transmission shaft is provided with cam; the plunger is arranged in the shell and is perpendicular to the transmission shaft, the plunger can move horizontally in the shell, one end of the plunger is provided with return spring, and the other end is provided with return sleeve and is in contact with the cam, the transmission shaft rotates, the plunger is driven to move by the cam, the plunger is automatically reset by the return spring, the suction valve and the pressure valve are opened and closed correspondingly, and oil suction and oil discharge are carried out.

2. A high pressure fuel pump assembly according to claim 1, wherein, The shell is provided with oil suction valve seat and oil outlet valve seat, and the suction valve and the pressure valve are limited respectively.

3. A high pressure fuel pump assembly according to claim 2, wherein The suction valve is conical valve and is arranged in the oil suction valve seat and adopts cylindrical surface guide.

4. A high pressure fuel pump assembly as claimed in claim 2, wherein The pressure valve is ball valve.

5. A high pressure fuel pump assembly according to claim 4, wherein, The pressure valve adopts ceramic material.

6. A high pressure fuel pump assembly as claimed in claim 1, wherein, The transmission shaft is arranged in the shell through sliding bearing, and the sliding bearing is in interference fit with the shell.

7. A high pressure fuel pump assembly as claimed in claim 1, wherein, One side of the transmission shaft is provided with protruding part and constitutes eccentric structure, and the protruding part drives the cam to push the plunger.

8. A high pressure fuel pump assembly according to any one of claims 1 to 7, wherein, The plunger and the cam surface are subjected to coating treatment.

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