High-pressure fuel pump

Abstract

The utility model provides a high-pressure fuel pump which is characterized in that the high-pressure fuel pump comprises a pump body, the pump body is connected with an oil inlet nozzle and an oil outlet nozzle, and the pump body is internally provided with a compression cavity; the pressurizing assembly is used for compressing the fuel oil in the compression cavity; the low-pressure buffer chamber is communicated with the oil inlet nozzle; the electromagnetic valve assembly is used for connecting the low-pressure buffer cavity and the compression cavity and controlling the output fuel oil quantity and oil pressure, the electromagnetic valve assembly comprises a valve element assembly and a valve seat, and the valve element assembly and the electromagnetic valve seat are welded and fixed; the one-way valve assembly is used for connecting the oil outlet connector and the compression cavity; and the oil inlet seat is connected to the upper part of the pump body. The sealing performance is still good under high pressure through a closed structure formed by welding and fixing the valve element assembly and the electromagnetic valve seat.

Description

TECHNICAL FIELD

[0001] The utility model relates to a high pressure fuel pump. BACKGROUND

[0002] The high pressure fuel pump in the gasoline direct injection (GDI) system, the role is to suck the fuel from the fuel tank, pressurize and deliver to the fuel supply pipe, and cooperate with the fuel pressure regulator to establish a certain fuel pressure. The existing high pressure fuel pump has the problem that the sealing structure cannot meet the use requirement. UTILITY MODEL CONTENTS

[0003] The utility model discloses to the above problem of prior art, propose a kind of high pressure fuel pump, by the closed structure of valve core subassembly and solenoid valve seat welding fixation, sealing is still good under high pressure.

[0004] The utility model discloses a kind of high pressure fuel pump, it is characterized in that, including pump body, pump body is connected with oil inlet nozzle and oil outlet nozzle, the pump body is equipped with:

[0005] Compression cavity;

[0006] Pressure increasing assembly, the pressure increasing assembly is used to compress fuel in compression cavity;

[0007] Low-pressure buffer chamber, the low-pressure buffer chamber is communicated with oil inlet nozzle;

[0008] Solenoid valve assembly, the solenoid valve assembly is used to connect low-pressure buffer chamber with compression cavity and control the oil quantity and oil pressure that can be exported, the solenoid valve assembly includes valve core subassembly and valve seat, the valve core subassembly is fixed with solenoid valve seat by welding;

[0009] Check valve assembly, the check valve assembly is used to connect oil outlet connector with compression cavity;

[0010] Oil inlet seat, the oil inlet seat is connected on the upper portion of pump body.

[0011] Further, the low-pressure buffer chamber is connected with filter screen, oil inlet nozzle and low-pressure buffer chamber outer end are connected in screw thread and are equipped with oil inlet nozzle washer, the pump body is equipped with oil passage and is communicated with low-pressure buffer chamber and compression cavity.

[0012] Further, the oil outlet nozzle is connected in screw thread with pump body and is equipped with oil outlet nozzle washer, and the oil outlet nozzle is communicated with compression cavity.

[0013] Further, the booster assembly comprises a bushing, a booster sleeve, an oil seal seat, a piston shaft, a large spring, a spring seat and a fixing member, the bushing and the booster sleeve are arranged at the lower end of the pump body, the oil seal seat is threadedly connected to the lower end of the pump body, the large spring is arranged on the piston shaft, the spring seat and the fixing member are sequentially arranged at the tail of the piston shaft, and the piston shaft reciprocates in the compression cavity.

[0014] Further, the oil inlet seat is connected with a plug and is fixed on the pump body through a screw, and the oil inlet seat and the oil passing channel are sequentially provided with symmetrically arranged dampers, diaphragms, wave washers and check rings.

[0015] Further, the valve core assembly comprises an iron core, an electromagnetic valve spring, a moving iron core shaft, a magnetic shield ring, an armature bushing, an oil passing valve seat, a one-way valve core, a valve core spring and an oil passing valve shell, the electromagnetic valve spring is arranged in the iron core and the moving iron core shaft, the moving iron core shaft is arranged on the armature bushing, the magnetic shield ring is arranged on the moving iron core shaft and is welded and fixed with the electromagnetic valve seat, and the oil passing valve seat, the one-way valve core, the valve core spring and the oil passing valve shell are sequentially connected and fixed and arranged on the armature bushing.

[0016] Further, the pump body is made of gravity cast aluminum alloy.

[0017] Compared with the prior art, the application has the advantages that the closed structure of the valve core assembly and the electromagnetic valve seat is welded and fixed, and the sealing property is still good under high pressure. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic view of a high-pressure fuel pump;

[0019] Figure 2 is a schematic view of a pump body;

[0020] Figure 3 is another perspective view of the high-pressure fuel pump;

[0021] Figure 4 is Figure 3 is a B-B sectional view;

[0022] Figure 5 is Figure 3 is an A-A sectional view;

[0023] In the diagram, 1. Pump body; 11. Oil passage; 12. Low-pressure buffer chamber; 2. Oil inlet seat; 21. Plug; 22. Damper; 23. Waveform washer; 24. Retaining ring; 25. Diaphragm; 3. Oil outlet; 31. Oil outlet washer; 4. Oil inlet; 41. Filter element; 42. Oil inlet washer; 5. Solenoid valve assembly; 501. Oil passage valve housing; 502. Oil passage valve seat; 503. Armature bushing; 504. Moving iron core shaft; 505. Magnetic isolation ring; 506. Iron core; 6. Pressure boosting assembly; 61. Bushing; 62. Pressure boosting sleeve; 63. Oil seal seat; 66. Large spring; 67. Piston shaft; 68. Spring seat; 69. Fixing component. Detailed Implementation

[0024] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings.

[0025] like Figures 1-5 As shown, a high-pressure fuel pump is characterized by comprising a pump body 1, wherein the pump body 1 is connected to an inlet nozzle 4 and an outlet nozzle 3, and the pump body 1 is provided with:

[0026] Compression chamber;

[0027] Boosting assembly 6, which is used to compress fuel in the compression chamber;

[0028] Low-pressure buffer chamber 12, which is connected to oil inlet 4;

[0029] Solenoid valve assembly 5, which is used to connect the low-pressure buffer chamber 12 and the compression chamber and control the output fuel quantity and pressure, includes a valve core assembly and a valve seat, and the valve core assembly and the solenoid valve seat are welded and fixed.

[0030] A one-way valve assembly, the one-way valve assembly being used to connect the oil outlet connector and the compression chamber;

[0031] Oil inlet seat 2 is connected to the upper part of pump body 1.

[0032] Oil suction stroke: During the oil suction process, the booster assembly 6 provides the power for oil suction by moving downward, and at the same time, the solenoid valve assembly 5 is opened, and the fuel is sucked into the compression chamber through the low-pressure buffer chamber 12.

[0033] The function of the low-pressure buffer chamber 12 is to absorb the pressure fluctuations generated during this process.

[0034] Pumping stroke: At the beginning of the pumping stroke, the solenoid valve assembly 5 is de-energized, causing the check valve assembly to close under the combined action of the increased pressure in the low-pressure buffer chamber 12 and the closing spring in the valve. The booster assembly 6 moves upward and generates pressure in the compression chamber. When the pressure exceeds the pressure in the fuel rail, the check valve is opened and fuel is pumped into the fuel rail.

[0035] Further, the low pressure buffer chamber 12 is connected with a filter screen 41, the oil inlet nozzle 4 is threadedly connected with the outer end of the low pressure buffer chamber 12 and is provided with an oil inlet nozzle gasket 42, and the pump body 1 is provided with an oil passing channel 11 for connecting the low pressure buffer chamber 12 with the compression chamber. The filter screen 41 is used for filtering fuel impurities.

[0036] Further, the oil outlet nozzle 3 is threadedly connected with the pump body 1 and is provided with an oil outlet nozzle gasket 31, and the oil outlet nozzle 3 is connected with the compression chamber.

[0037] Further, the booster assembly 6 comprises a bushing 61, a booster sleeve 62, an oil seal seat 63, a piston shaft 67, a large spring 66, a spring seat 68 and a fixing member 69, the bushing 61 and the booster sleeve 62 are arranged at the lower end of the pump body 1, the oil seal seat 63 is threadedly connected with the lower end of the pump body 1, the large spring 66 is sleeved on the piston shaft 67, the spring seat 68 and the fixing member 69 are sequentially arranged at the tail of the piston shaft 67, and the piston shaft 67 reciprocates in the compression chamber. In the above structure, all the connections between the pump body 1 are threadedly connected, and the detachable connection method is adopted, so that the pump body 1 can be easily disassembled and replaced.

[0038] Further, the oil inlet seat 2 is connected with a plug 21 and is fixed on the pump body 1 through a screw, and the oil inlet seat 2 is sequentially provided with symmetrically arranged dampers 22 and diaphragms 25 between the oil passing channel 11 and is provided with wave gaskets 23 and check rings 24.

[0039] Further, the valve core assembly comprises an iron core 506, an electromagnetic valve spring, a moving iron core shaft 504, a magnetic shielding ring 505, an armature bushing 503, an oil passing valve seat 502, a one-way valve core, a valve core spring and an oil passing valve shell 501, the electromagnetic valve spring is located in the iron core 506 and the moving iron core shaft 504, the moving iron core shaft 504 is inserted in the armature bushing 503, the magnetic shielding ring 505 is sleeved on the moving iron core shaft 504 and is welded and fixed with the electromagnetic valve seat, and the oil passing valve seat 502, the one-way valve core, the valve core spring and the oil passing valve shell 501 are sequentially connected and fixed and are arranged on the armature bushing 503. The valve core assembly controls the output fuel oil amount and oil pressure.

[0040] Further, the pump body 1 is made of gravity cast aluminum alloy.

[0041] The above technical scheme of the utility model provides a solution significantly different from the prior art, and the parts not involved in the technical scheme of the application are the same as or can be realized by the prior art, and thus will not be described herein.

[0042] The technical solutions in the above embodiments have clearly and completely described the content of the utility model. Apparently, the described embodiments are only some embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

Claims

1. A high pressure fuel pump, characterized by, The pump body is connected with an oil inlet nozzle and an oil outlet nozzle, and is provided with: a compression cavity; a pressure boosting assembly for compressing fuel in the compression cavity; a low-pressure buffer chamber connected with the oil inlet nozzle; a solenoid valve assembly for connecting the low-pressure buffer chamber with the compression cavity and controlling the output fuel quantity and oil pressure, the solenoid valve assembly comprising a valve core assembly and a valve seat, and the valve core assembly being welded and fixed with the solenoid valve seat; a one-way valve assembly for connecting the oil outlet joint with the compression cavity; an oil inlet seat connected on the upper portion of the pump body.

2. The high-pressure fuel pump of claim 1, wherein The low-pressure buffer chamber is connected with a filter screen, the oil inlet nozzle is threadedly connected with the outer end of the low-pressure buffer chamber and is provided with an oil inlet nozzle gasket, and the pump body is provided with an oil passage for connecting the low-pressure buffer chamber with the compression cavity.

3. The high-pressure fuel pump of claim 1, wherein The oil outlet nozzle is threadedly connected with the pump body and is provided with an oil outlet nozzle gasket, and the oil outlet nozzle is connected with the compression cavity.

4. The high-pressure fuel pump of claim 1, wherein The pressure boosting assembly comprises a bushing, a pressure boosting sleeve, an oil seal seat, a piston shaft, a large spring, a spring seat and a fixing member, the bushing and the pressure boosting sleeve are arranged at the lower end of the pump body, the oil seal seat is threadedly connected with the lower end of the pump body, the large spring sleeve is arranged on the piston shaft, the spring seat and the fixing member are sequentially arranged on the tail portion of the piston shaft, and the piston shaft reciprocates in the compression cavity.

5. The high-pressure fuel pump of claim 2, wherein A plug is connected on the oil inlet seat and is fixed on the pump body by a screw, and a damper and a diaphragm are sequentially arranged between the oil inlet seat and the oil passage, and a wave-shaped gasket and a check ring are arranged between the damper and the diaphragm.

6. The high-pressure fuel pump of claim 1, wherein The valve core assembly comprises an iron core, a solenoid valve spring, a moving iron core shaft, a magnetic shielding ring, an armature bushing, an oil passage valve seat, a one-way valve core, a valve core spring and an oil passage valve shell, the solenoid valve spring is arranged in the iron core and the moving iron core shaft, the moving iron core shaft is inserted in the armature bushing, the magnetic shielding ring is sleeved on the moving iron core shaft and is welded and fixed with the solenoid valve seat, the oil passage valve seat, the one-way valve core, the valve core spring and the oil passage valve shell are sequentially connected and fixed and are arranged on the armature bushing.

7. The high-pressure fuel pump of claim 1, wherein The pump body is made of gravity cast aluminum alloy.

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