CN219159566U

CN219159566U - Pressure release valve of high-pressure fuel pump

Info

Publication number: CN219159566U
Application number: CN202222729350.4U
Authority: CN
Inventors: 张建顺; 万友法
Original assignee: Passtone Power Technology Jiaxing Co ltd
Current assignee: Passtone Power Technology Jiaxing Co ltd
Priority date: 2022-10-17
Filing date: 2022-10-17
Publication date: 2023-06-09
Anticipated expiration: 2032-10-17

Abstract

The utility model provides a high pressure fuel pump relief valve, it includes the valve body, the disk seat, case and spring, the valve body adopts one end to seal the open-ended structure of the other end, the outside first step of valve body and second step, be the big both ends diameter of intermediate diameter small structure, the cross-section of valve cap is by the polygon structure that arc section and straight flange section constitute, the arc section can constitute good motion cooperation between case and the valve body, straight flange section can realize the control of oil release volume size, the defect of prior art has been overcome, compared with prior art scheme, can obviously improve stability, the reliability of product, the processing technology is simple, low cost's characteristics.

Description

Pressure release valve of high-pressure fuel pump

Technical Field

The utility model relates to a high-pressure fuel pump relief valve of a direct injection delivery fuel pump in a gasoline cylinder.

Background

The prior patent document US8062623B2 discloses a high-pressure pump safety valve, pressure drop is realized through throttling of a slender small hole, the slender small hole is machined on a part, a drilling cutting machining process is needed, and the defects of time consumption, low machining efficiency and high cost exist. Chinese patent ZL201620281778.5 discloses a high-pressure fuel pump relief valve, the valve body adopts the structure that both ends link up, the sealing seat of one end and the spring holder of the other end need adopt the mode of both ends simultaneous pressure equipment to assemble, like this, there is not fixed datum plane at pressure equipment in-process both ends, it is difficult to realize that there is better straightness that hangs down between valve body and sealing seat, the spring holder, influence the motion of end cap in the valve body smooth and easy, the reliability of using of fuel pump relief valve has been reduced, in addition, the fuel is through the clearance outflow between end cap and the valve body inner chamber, reach the purpose of pressure release, keep suitable motion clearance between end cap and the valve body inner chamber, can improve the reliability of relief valve, the control of motion clearance and flow clearance size satisfies the needs simultaneously hardly to realize to current structure.

Disclosure of Invention

The utility model aims to improve the defects and provides the high-pressure fuel pump relief valve which can reduce the processing and installation requirements, has good reliability and is controllable in flow.

The purpose of the utility model is realized in the following way: the utility model relates to a pressure release valve of a high-pressure fuel pump, which comprises a valve body, a valve seat, a valve core and a spring, and is characterized in that the valve body is provided with a round hole-shaped inner cavity along the length direction, and has a structure with one end closed and one end open, a spring limiting hole is arranged on the bottom surface of the closed end of the inner cavity, and a drain oil outlet is arranged on the side wall close to the closed end; the valve seat is arranged at the opening end of the valve body, and is provided with a drain oil inlet hole; above-mentioned case includes valve bonnet and valve rod, is equipped with the end cap in the middle of the top of valve bonnet, and the cross-section of valve bonnet is the polygon structure that comprises circular arc section and straight flange section, and above-mentioned spring housing is put on above-mentioned valve rod, and the one end of spring is inconsistent with the valve bonnet, and one end is placed in the spacing downtheholely of spring and is inconsistent with the bottom of the spacing downtheholely of spring, and the end cap in the middle of the spring pops out the valve bonnet top under the elasticity of spring under the normality, the end cap is with the shutoff of the oil drain inlet port on the disk seat.

According to the technical scheme, the cross section of the valve cap is of a quadrilateral structure formed by an arc section and a straight-side section.

According to the technical scheme, the cross section of the valve cap is of a hexagonal structure formed by an arc section and a straight section.

According to further optimization of the technical scheme, the valve body is provided with a first step and a second step along the length direction, and the valve body is of a structure with a large middle diameter and small diameters at two ends.

According to further optimization of the technical scheme, a guide conical surface is arranged at the opening of the valve body.

According to the technical scheme, the plug and the valve cap in the middle of the top of the valve cap are of an integrated structure.

According to the technical scheme, the plug in the middle of the top of the valve cap is of a structure formed by placing a ball in the middle of the top of the valve cap.

Compared with the prior art, the high-pressure fuel pump relief valve provided by the utility model has at least the following technical effects:

1. the valve body adopts a structure that one end is closed and the other end is pressed, a fixed reference is arranged in the pressing process, the pressing precision between the valve body and the valve seat is favorably controlled, and meanwhile, the guiding conical surface at the opening of the valve body is also favorable for the operation during the pressing.

2. The first step and the second step outside the valve body are of structures with large middle diameter and small diameters at two ends, so that the installation and the use are facilitated, and after the pressure release valve is installed in the installation cavity of the fuel pump, an oil way in which a drainage oil inlet oil way is communicated with a drainage oil inlet hole and an oil way in which the drainage oil hole is communicated with a drainage oil outlet oil way are naturally formed.

3. The cross section of the valve cap is of a polygonal structure formed by a circular arc section and a straight edge section, the circular arc section can form good motion fit between the valve core and the valve body, the straight edge section can realize the control of the oil leakage amount, and only the quantity of the polygonal circular arc section and the straight edge section is required to be changed or the sizes of the polygonal circular arc section and the straight edge section are required to be changed.

4. The plug in the middle of the top of the valve cap and the valve cap can adopt an integrated or separated structure, and can be selected on the aspects of convenient installation or convenient processing according to the processing capability.

According to the technical effects obtained above, the technical scheme provided by the utility model is an improved technical scheme which is provided for the prior art product from the aspect of being beneficial to improving the stability and reliability of the product work under the condition of saving equipment, and compared with the prior art scheme, the stability and reliability of the product can be obviously improved, and the method has the characteristics of simple processing technology and low cost.

Drawings

Fig. 1 is a schematic structural view of a relief valve for a high-pressure fuel pump according to the present utility model.

Fig. 2 is an exploded view of fig. 1.

Fig. 3 is a schematic structural view of the valve body.

Fig. 4 is a schematic structural view of the valve core.

FIG. 5 is a schematic cross-sectional view of a bonnet.

Fig. 6 is a schematic cross-sectional view of another embodiment.

Fig. 7 is a schematic structural view of the valve seat.

Fig. 8 is a schematic structural view of the present utility model in a use state.

In the attached drawings, 1, a valve body; 11. a drain oil outlet hole; 12. a spring limit hole; 13. a first step; 14. a second step; 15. a guide tapered surface; 2. a spring; 3. a valve core; 31. a valve stem; 32. a valve cap; 321. a circular arc section; 322. a straight edge section; 4. a plug; 5. a valve seat; 51. a draining oil inlet hole; 6. a pump body; 7. oil draining and feeding way; 8. the oil draining and feeding oil way is communicated with the oil draining and feeding hole; 9. and the oil drain hole is communicated with the oil drain oil outlet oil way.

Detailed Description

The utility model is further illustrated by way of example with reference to the accompanying drawings in which:

as shown in fig. 1, 2, 3 and 7, the pressure release valve of the high-pressure fuel pump of the utility model comprises a valve body 1, a valve seat 5, a valve core 3 and a spring 2, wherein the valve body 1 is provided with a round hole-shaped inner cavity along the length direction, and has a structure with one closed end and one open end, a spring limiting hole 12 is arranged on the bottom surface of the closed end of the inner cavity, and a drain oil outlet is arranged on the side wall close to the closed end; the valve seat 5 is provided at an opening end of the valve body 1, and a drain oil inlet 51 is provided in the valve seat 5.

As shown in fig. 1, 2 and 4, the valve core 3 includes a valve cap 32 and a valve rod 31, a plug 4 is provided in the middle of the top of the valve cap 32, the cross section of the valve cap 32 is a polygonal structure formed by an arc section 321 and a straight section 322, the spring 2 is sleeved on the valve rod 31, one end of the spring 2 is in contact with the valve cap 32, the other end is placed in the spring limiting hole 12 and in contact with the bottom of the spring limiting hole 12, the plug 4 in the middle of the top of the valve cap 32 is ejected out by the elastic force of the spring 2 in normal state, and the plug 4 plugs the oil drain inlet 51 on the valve seat 5.

As shown in fig. 4, 5 and 6, the cross section of the valve cap 32 is a quadrilateral structure formed by a circular arc section 321 and a straight section 322, or the cross section of the valve cap 32 is a hexagonal structure formed by a circular arc section 321 and a straight section 322.

As shown in fig. 1, the valve body 1 has a first step 13 and a second step 14 along the length direction, and has a structure with a large middle diameter and a small diameter at two ends, and a guiding conical surface 15 is arranged at the opening of the valve body 1.

As shown in fig. 1 and 2, the top middle plug 4 of the bonnet 32 and the bonnet 32 are integrally formed, or the top middle plug 4 of the bonnet 32 is formed by a ball placed in the top middle of the bonnet 32.

As shown in fig. 8, the first step 13 and the second step 14 outside the valve body 1 are in a structure with large middle diameter and small diameters at two ends, which is beneficial to installation and use, and after the pressure release valve is installed in the installation cavity of the fuel pump, an oil way 8 in which a drainage oil inlet oil way is communicated with a drainage oil inlet hole and an oil way 9 in which a drainage oil hole is communicated with a drainage oil outlet oil way are naturally formed.

Claims

1. The high-pressure fuel pump relief valve comprises a valve body (1), a valve seat (5), a valve core (3) and a spring (2), and is characterized in that the valve body (1) is provided with a round hole-shaped inner cavity along the length direction, has a structure with one closed end and one open end, a spring limiting hole (12) is arranged on the bottom surface of the closed end of the inner cavity, and a drain oil outlet is arranged on the side wall close to the closed end; the valve seat (5) is arranged at the opening end of the valve body (1), and the valve seat (5) is provided with a drain oil inlet hole (51); above-mentioned case (3) include valve cap (32) and valve rod (31), be equipped with end cap (4) in the middle of the top of valve cap (32), the cross-section of valve cap (32) is the polygon structure that comprises circular arc section (321) and straight flange section (322), above-mentioned spring (2) cover is put on valve rod (31) above-mentioned, the one end of spring (2) is inconsistent with valve cap (32), one end is placed in spring spacing hole (12) and is inconsistent with the bottom of spring spacing hole (12), the end cap (4) in the middle of the spring (2) are popped out at the elasticity of spring (2) under the normality top, end cap (4) are with oil drain inlet port (51) shutoff on disk seat (5).

2. The high-pressure fuel pump relief valve according to claim 1 wherein said bonnet (32) has a quadrilateral cross section formed by a circular arc section (321) and a straight section (322).

3. The high pressure fuel pump relief valve according to claim 1 wherein said valve cap (32) has a hexagonal cross-section formed by a circular arc segment (321) and a straight segment (322).

4. A high pressure fuel pump relief valve according to any one of claims 1-3, characterized in that said valve body (1) has a first step (13) and a second step (14) in the longitudinal direction on the outside thereof, and has a structure with a large middle diameter and a small diameter on both ends.

5. A high pressure fuel pump relief valve according to any one of claims 1-3, characterized in that the valve body (1) is provided with a guiding conical surface (15) at the opening.

6. The high pressure fuel pump relief valve according to claim 1 wherein said top intermediate plug (4) of said valve cap (32) and valve cap (32) are of unitary construction.

7. A high pressure fuel pump relief valve according to claim 1 wherein said top intermediate plug (4) of said valve cap (32) is a structure formed by a ball placed in the top intermediate of said valve cap (32).