CN220336993U

CN220336993U - Automobile fuel spray nozzle

Info

Publication number: CN220336993U
Application number: CN202321834354.7U
Authority: CN
Inventors: 成舒光
Original assignee: Shanghai Chengsheng Industrial Co ltd
Current assignee: Shanghai Chengsheng Industrial Co ltd
Priority date: 2023-07-12
Filing date: 2023-07-12
Publication date: 2024-01-12
Anticipated expiration: 2033-07-12

Abstract

The utility model discloses an automobile oil nozzle, which comprises: the body is internally provided with a push rod, and two sides of the push rod are connected with a spring and a needle valve; the oil inlet component comprises an oil inlet and an oil inlet cavity, a filter element is arranged between the oil inlet and the oil inlet cavity, and three types of filter elements are arranged; the oil return assembly comprises an oil return port, one side of the oil return port is provided with a backflow block, and two sides of the backflow block are provided with backflow holes and filtering holes. The filter screen holes of the filter element comprise three shapes, and can be replaced according to the requirements, so that the gasoline quality flowing into a fuel system is ensured; the two sides of the backflow block are provided with the backflow holes and the filtering holes, so that the phenomenon that the oil injection pressure is reduced due to the increase of the oil return amount can be eliminated, the fuel combustion is more sufficient, and the carbon deposition is prevented.

Description

Automobile fuel spray nozzle

Technical Field

The utility model relates to the technical field of automobile fuel nozzles, in particular to an automobile fuel nozzle.

Background

The fuel injection nozzle of the automobile is a simple electromagnetic valve. When the electromagnetic coil is electrified, suction force is generated, the needle valve is sucked up, the spray holes are opened, fuel oil is sprayed out at high speed through the annular gap between the shaft needle of the needle valve head and the spray holes, and mist is formed, so that the full combustion is facilitated. It directly affects the combustion efficiency, fuel economy and exhaust emission of the engine, and when the fuel nozzle is blocked, the performance of the automobile is seriously affected, and the blocking is caused by carbon deposit in the engine on the fuel nozzle or by impurities in the fuel oil, etc. blocking the passage of the fuel nozzle. When the automobile is at idle speed, the vibration of the engine can cause the oil injection quantity to change, so that the fuel is not combusted sufficiently, and the generated colloid can form carbon deposition under the high-temperature effect, so that the service lives of the filter element and the spring inside the oil nozzle are shortened.

Disclosure of Invention

The utility model aims at: in order to solve the problems, the utility model provides an automobile oil nozzle.

The utility model adopts the following technical scheme for realizing the purposes, and comprises the following steps: the device comprises a body, wherein a push rod is arranged in the body, springs and a needle valve are connected to two sides of the push rod, and spray holes are formed in the tip of the needle valve;

the oil inlet assembly is perpendicular to the body and comprises an oil inlet and an oil inlet cavity, a filter element is arranged between the oil inlet and the oil inlet cavity, and three types of filter elements are arranged;

the oil return assembly is arranged at an angle of 45 degrees with the body, the oil return assembly comprises an oil return port, a reflux block is arranged on one side of the oil return port, and reflux holes and filtering holes are formed in two sides of the reflux block.

As a further description of the above technical solution, the filter element comprises a housing, the housing is connected with a rubber ring, and a filter screen is arranged inside the housing.

As a further description of the above technical solution, the pores of the filter screen comprise three shapes, and the pore size is 0.2-0.6mm.

As a further description of the above technical solution, the opening pressure of the needle valve is 15-20MPa, and the lift of the needle valve is 0.1-0.2mm.

As a further description of the above technical solution, the two ends of the needle valve and the oil surface form a bearing cone and a sealing cone, and the angles of the bearing cone and the sealing cone are 30-60 °.

As a further description of the above technical solution, the spray holes are distributed circumferentially at equal intervals, and the number of the spray holes is 4-8.

As a further description of the above technical solution, the diameter of the nozzle hole is 0.2-0.4mm, and the injection angle of the nozzle hole is 150 °.

As a further description of the technical scheme, a protective cap is arranged on one side of the body, a fastening bolt is arranged in the protective cap, and a pressure regulating screw is arranged between the fastening bolt and the spring.

As a further description of the technical scheme, a needle valve body is arranged on the outer side of the needle valve, and a positioning pin is arranged between the needle valve body and the body.

As a further description of the above technical solution, the needle valve body is provided with a fastening screw sleeve on the outer side, and the body is provided with a fixing component on the outer side.

The beneficial effects of the utility model are as follows:

1. according to the utility model, the filter screen holes of the filter element comprise three shapes, and can be replaced according to requirements, so that the gasoline quality flowing into a fuel system is ensured; the two sides of the backflow block are provided with the backflow holes and the filtering holes, so that the phenomenon that the oil injection pressure is reduced due to the increase of the oil return amount can be eliminated, the fuel combustion is more sufficient, and the carbon deposition is prevented.

In order to more clearly illustrate the structural features and functions of the present utility model, the present utility model will be described in detail below with reference to the accompanying drawings and the embodiments.

Drawings

FIG. 1 is a schematic view of the structure of an automotive fuel injector of the present utility model;

FIG. 2 is a cross-sectional view of an automotive fuel injector of the present utility model;

FIG. 3 is an enlarged schematic view of the oil intake assembly of FIG. 2;

FIG. 4 is a schematic view of the structure of the different filter screens in FIG. 3;

fig. 5 is an enlarged schematic view of the oil return assembly of fig. 2.

Reference numerals: 1. a body; 2. an oil inlet assembly; 21. an oil inlet; 22. an oil inlet cavity; 23. a filter element; 231. a housing; 232. a filter screen; 233. a rubber ring; 3. an oil return assembly; 31. an oil return port; 32. a reflow block; 321. a reflow hole; 322. a filter hole; 323. a reflow chamber; 4. a spring; 5. a push rod; 6. a needle valve; 7. a needle valve body; 71. a pressure-bearing conical surface; 72. sealing the conical surface; 8. a spray hole; 9. a protective cap; 10. a fastening bolt; 11. a pressure regulating screw; 12. a positioning pin; 13. fastening the screw sleeve; 14. and fixing the assembly.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

As shown in fig. 1-5, in one embodiment, an automotive fuel injector includes: the novel oil return device comprises a body 1, wherein the body 1 is connected with an oil inlet assembly 2 and an oil return assembly 3, a push rod 5 is arranged in the body 1, springs 4 and a needle valve 6 are connected to two sides of the push rod 5, and a spray hole 8 is formed in the tip of the needle valve 6.

Further, a protective cap 9 is arranged on one side of the body 1, a fastening bolt 10 is arranged in the protective cap 9, and a pressure regulating screw 11 is arranged between the fastening bolt 10 and the spring 4. The opening pressure of the needle valve 6 depends on the pretightening force of the pressure regulating spring 4, different engines have different oil injection pressure requirements, the opening pressure can be regulated by the pressure regulating screw 11, the pressure is increased when screwing in, and the pressure is reduced when screwing out.

Further, a needle valve body 7 is provided outside the needle valve 6, and a positioning pin 12 is provided between the needle valve body 7 and the body 1. The outside of the needle valve body 7 is provided with a fastening screw sleeve 13, and the outside of the body 1 is provided with a fixing component 14. The main components of the fuel injector are a needle valve 6 and a needle valve body 7, the two components are collectively called a needle valve even piece, the fit clearance of the needle valve even piece is required to be within a specified range, oil leakage can be generated when the clearance is large, the oil pressure is reduced, and the needle valve 6 is limited to slide when the clearance is small. Through locating pin 12, fastening swivel nut 13 and elastic fixation subassembly 14, can guarantee the high-accuracy sliding fit of fuel sprayer at operating condition, better with the fuel spraying into the fog drip of finer grain to according to the requirement of combustion chamber, spread the fuel in the combustion chamber, mix the back burning with compressed air evenly.

Specifically, the opening pressure of the needle valve 6 is 15-20MPa, and the lift of the needle valve 6 is 0.1-0.2mm. Both ends of the needle valve 6 and the oil surface form a pressure-bearing cone surface 71 and a sealing cone surface 72, and the angle of the pressure-bearing cone surface 71 and the sealing cone surface 72 is 30-60 degrees. The pressure-bearing conical surface 71 is used for bearing the action of oil pressure in the high-pressure oil cavity, so that the needle valve 6 generates upward axial thrust, and overcomes the pretightening force of the pressure-regulating spring 4 and the friction force between the needle valve 6 and the needle valve 6 body, so that the oil injector realizes oil injection; the contact surface of the sealing conical surface 72 is narrower, the sealing specific pressure is larger, and the sealing is easier to realize.

Specifically, the spray holes 8 are circumferentially distributed at equal intervals, the number of the spray holes 8 is 4-8, the diameter of the spray holes 8 is 0.2-0.4mm, and the spray angle of the spray holes 8 is 150 degrees. The hole type fuel injector has high fuel injection pressure, good spray quality, simple structure and low manufacturing cost, and is easy to maintain and replace.

As shown in fig. 3 and 4, for the specific structure of the oil inlet assembly 2, the oil inlet assembly 2 is perpendicular to the body 1, the oil inlet assembly 2 comprises an oil inlet 21 and an oil inlet cavity 22, a filter element 23 is arranged between the oil inlet 21 and the oil inlet cavity 22, and three types of filter elements 23 are arranged; the filter element 23 comprises a housing 231, the housing 231 is connected with a rubber ring 233, and a filter screen 232 is arranged inside the housing 231. The pores of the screen 232 include three shapes, with pore sizes of 0.2-0.6mm. The filter screen can filter out solid impurities such as ferric oxide, dust and the like in the gasoline, can reduce the probability of blocking the oil nozzle by the impurities, and ensures the gasoline quality flowing into a fuel system.

As shown in fig. 5, describing the oil return assembly 3, the oil return assembly 3 and the body 1 form an angle of 45 °, the oil return assembly 3 includes an oil return port 31, a backflow block 32 is disposed on one side of the oil return port 31, and backflow holes 321 and filtering holes 322 are disposed on two sides of the backflow block 32. When the needle valve 6 is severely worn or the needle valve 6 body is not tightly matched with the oil injector shell, the oil return amount of the oil injector is obviously increased, which can lead to the reduction of the oil injection pressure and the delay of the oil injection time, so that the power of the engine is reduced and even flameout is caused. The backflow hole 321 can effectively reduce the sudden increase of the backflow amount, so that fuel enters the backflow cavity 323 through the backflow hole 321, and then the excessive fuel flows back to the fuel tank through the filtering hole 322, so that the consumption of the oil amount is reduced.

When the fuel injector works, high-pressure fuel from the fuel injection pump enters the oil inlet 21 on the fuel injector body 1 through the fuel pipe connector, then enters the oil inlet cavity 22 on one side of the needle valve body 7 after passing through the filter element 23, acts on the pressure-bearing conical surface 71 of the needle valve 6, forms an upward axial thrust to the needle valve 6, and when the thrust is larger than the precompression of the fuel injector spring 4, the needle valve 6 immediately moves upwards to open the spray hole 8, and high-pressure diesel fuel is sprayed into the combustion chamber.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automotive fuel injector, comprising: the needle valve comprises a body (1), wherein a push rod (5) is arranged in the body (1), springs (4) and a needle valve (6) are connected to two sides of the push rod (5), and a spray hole (8) is formed in the tip of the needle valve (6);

the oil inlet assembly (2), the oil inlet assembly (2) is perpendicular to the body (1), the oil inlet assembly (2) comprises an oil inlet (21) and an oil inlet cavity (22), a filter element (23) is arranged between the oil inlet (21) and the oil inlet cavity (22), and three types of filter elements (23) are arranged;

the oil return assembly (3), oil return assembly (3) and body (1) are 45 angles, oil return assembly (3) are including oil return opening (31), oil return opening (31) one side is provided with backward flow piece (32), backward flow piece (32) both sides are provided with backward flow hole (321) and filtration pore (322).

2. An automotive fuel injector according to claim 1, characterized in that the filter cartridge (23) comprises a housing (231), the housing (231) being connected with a rubber ring (233), a filter screen (232) being provided inside the housing (231).

3. An automotive fuel injector according to claim 2, characterized in that the apertures of the sieve (232) comprise three shapes, the aperture size being 0.2-0.6mm.

4. An automotive fuel injector according to claim 1, characterized in that the opening pressure of the needle valve (6) is 15-20MPa and the lift of the needle valve (6) is 0.1-0.2mm.

5. An automotive fuel injector according to claim 1, characterized in that both ends of the needle valve (6) and the oil surface form a bearing cone (71) and a sealing cone (72), the bearing cone (71) and the sealing cone (72) having an angle of 30-60 °.

6. An automotive fuel injector according to claim 1, characterized in that the injection holes (8) are circumferentially equally spaced, the number of injection holes (8) being 4-8.

7. An automotive fuel injector according to claim 1, characterized in that the diameter of the injection orifice (8) is 0.2-0.4mm and the injection angle of the injection orifice (8) is 150 °.

8. The automobile fuel injection nozzle according to claim 1, wherein a protective cap (9) is arranged on one side of the body (1), a fastening bolt (10) is arranged inside the protective cap (9), and a pressure regulating screw (11) is arranged between the fastening bolt (10) and the spring (4).

9. An automotive fuel injector according to claim 1, characterized in that the needle valve body (7) is arranged outside the needle valve (6), and a positioning pin (12) is arranged between the needle valve body (7) and the body (1).

10. An automotive fuel injector according to claim 1, characterized in that the needle valve (6) is provided with a tightening screw (13) on the outside, and the body (1) is provided with a fixing assembly (14) on the outside.