CN216665802U

CN216665802U - Electric control fuel injector of internal combustion engine with single cylinder power larger than 100KW

Info

Publication number: CN216665802U
Application number: CN202123160568.4U
Authority: CN
Inventors: 秦龙; 韩宜龙; 孙建超; 李嵩; 游建民
Original assignee: Beiyou Electronic Control Fuel Injection System Tianjin Co ltd
Current assignee: Beiyou Electronic Control Fuel Injection System Tianjin Co ltd
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2022-06-03
Anticipated expiration: 2031-12-15

Abstract

The utility model discloses an internal combustion engine electric control oil injector with single cylinder power more than 100KW, which comprises an oil injector body, an electromagnetic valve, a control valve assembly, a needle valve matching part, a needle valve spring and a needle valve body, wherein an armature assembly of the control valve assembly comprises an armature and an armature rod, the upper end of the armature rod is inserted into a central hole of the electromagnet, the lower end of the armature rod is inserted into a built-in shell, and a valve ball which is abutted against a control valve plate is arranged at the lower end of the armature rod through a valve ball pressing block; an oil inlet throttling hole for communicating the pressure accumulation cavity with the control cavity and an oil outlet throttling hole for communicating the control cavity with the transition cavity are formed in the control valve plate; and an auxiliary throttling hole for communicating the pressure accumulation cavity and the transition cavity is obliquely arranged on the control valve plate. The advantages are that: the processing cost is reduced, the volume of the transition cavity is reduced, the number of parts is reduced, and therefore the fuel injector can be quickly cut off, and the post-combustion of the engine is good.

Description

Electric control fuel injector of internal combustion engine with single cylinder power larger than 100KW

Technical Field

The utility model belongs to the technical field of fuel injection systems of internal combustion engines, and particularly relates to an electric control fuel injector of an internal combustion engine with a single cylinder power of more than 100 KW.

Background

The electric control high-pressure common rail oil injection system of the diesel engine is generally applied to a road machine, and the electric control common rail oil injection system is also required to be adopted along with the upgrade of emission regulations of ultra-high-power diesel engines such as ship diesel engines.

The ultra-large flow fuel injector in the prior art is basically consistent with the technical principle of the well-known fuel injector of the road machine in the industry, and fuel injection and fuel cut-off are controlled by adopting a needle valve back pressure control mode. Namely, in the control chamber on the back of the needle valve, one orifice is communicated with the pressure accumulation volume chamber, and the other orifice is connected with the valve port of the electromagnetic valve in series and communicated with the low-pressure volume chamber.

The ultra-large flow fuel injector in the prior art is characterized in that a transition cavity between a control cavity and a valve port of an electromagnetic valve is large in volume, and a third throttle hole is used for communicating the transition cavity with a pressure accumulation volume cavity.

Referring to fig. 1, a lower end portion of a large-flow oil injector in the prior art is an injection portion including a nozzle needle valve, a pressure chamber, an injection hole, and the like; the upper end part is a pressure accumulation volume cavity and an electrical connection part which replace the pressure accumulation volume of the rail pipe; the middle part is a control part and mainly comprises an electromagnetic valve 1, a control valve seat 7, a control valve plate 3, a needle valve matching part 5 and the like.

The control section is shown in fig. 2 with a schematic oil circuit, and control oil enters the control chamber B from the accumulator chamber a through the orifice X, then enters the transition chamber C through the orifice Y, and then enters the low pressure chamber D when the ball valve is opened. The other throttle hole Z is used for communicating the pressure accumulation cavity A with the transition cavity C and assisting in adjusting the pressure change speed of the control cavity B during oil injection and oil cut-off.

In the prior art, three throttling holes are arranged on the control valve plate 3, and the conical surface of the ball valve is arranged on the control valve seat 7, so that the volume of the transition cavity C is large, and quick response of oil injection and oil cut is not facilitated; meanwhile, the machining difficulty and the machining cost are increased due to more parts.

The technical problems existing in the prior art are as follows:

because the volume of the transition cavity is large, after the electromagnetic valve is closed, the pressure recovery time of the transition cavity is long, so that the pressure establishment speed of the control cavity is slow, and the response time of fuel cut of the fuel injector is influenced.

In addition, three throttling holes and a control valve seat surface are arranged on the two parts, so that the sealing reliability between the two parts is ensured, the end face machining precision is improved, and the machining cost of the oil sprayer is increased.

Therefore, the utility model designs the electric control fuel injector of the internal combustion engine, which reduces the processing cost, the volume of the transition cavity and the number of parts, further realizes the rapid fuel cut-off of the fuel injector and has good post-combustion of the engine, and the single-cylinder power is more than 100 KW.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the prior art, the utility model provides the electric control fuel injector of the internal combustion engine, which has the advantages of reducing the processing cost, reducing the volume of a transition cavity and reducing the number of parts, further realizing rapid fuel cut-off of the fuel injector and good post-combustion of the engine, and ensuring that the single-cylinder power is more than 100 KW.

The utility model is realized in this way, an internal combustion engine electric control fuel injector with single cylinder power more than 100KW, comprising a fuel injector body, an electromagnetic valve, a control valve component arranged in a mounting cavity of the fuel injector body, a needle valve matching part, a needle valve spring (5c) and a needle valve body (5d), wherein the control valve component comprises an electromagnetic valve (1), a built-in shell (6), a control valve plate (3) and a valve ball (2), and the electromagnetic valve (1) comprises an electromagnet (1a) and an armature component (1 b); the needle valve matching part (5) comprises a needle valve (5a) and a needle valve sleeve (5b), the armature component adopts a split structure and comprises an armature (1c) and an armature rod (1d), the upper end of the armature rod is inserted into a central hole of the electromagnet (1a), the lower end of the armature rod is inserted into a built-in shell (6), and a valve ball (2) which is abutted against the control valve plate is installed at the lower end part of the armature rod through a valve ball pressing block (4); it is characterized in that; the volume cavity where the armature component (1b) is located is a low-pressure cavity (D); a transition oil passage hole (3b) below a ball valve conical surface (3a) on the control valve plate is a transition cavity; a volume cavity formed by an oil passage hole (3c) of the control valve plate and the needle valve matching part (5) is a control cavity (B); an oil passage hole (3d) of the valve plate and an annular volume between the needle valve body (5d) and the needle valve sleeve (5b) are pressure accumulation cavities (A); the oil inlet throttling hole (X) is communicated with the pressure accumulation cavity (A) and the control cavity (B), the oil outlet throttling hole (Y) is communicated with the control cavity (B) and the transition cavity (C), and the oil inlet throttling hole (X) and the oil outlet throttling hole (Y) are vertically arranged on the control valve plate; and an auxiliary throttling hole (Z) for communicating the pressure accumulation cavity (A) and the transition cavity (C) is obliquely arranged on the control valve plate.

Preferably, the oil outlet throttle hole Y, the transition oil channel hole (3b) and the ball valve conical surface (3a) are coaxially arranged, so that the circumferential uniformity of high-speed fluid in the transition cavity is facilitated, and the corrosion effect on the ball valve conical surface (3a) is reduced.

Preferably, the upper end surface of the needle valve sleeve (5B) is contacted with the lower end surface of the control valve plate, and the needle valve cavity is isolated from the pressure accumulation cavity (A) and the control cavity (B); the inner diameter of the upper end annular surface of the needle valve sleeve (5b) is larger than the diameter of the coupling surface of the needle valve coupling (5), and the eccentric oil outlet orifice (Y) is contained in the upper end annular surface of the needle valve sleeve (5 b).

The utility model has the advantages and technical effects that: compared with the prior art, the technical scheme reduces the number of control valve seats and reduces the processing difficulty and the processing cost. The utility model discloses the structure is arranged three orifice and control valve face on a part to greatly reduced the volume of transition chamber to original about 30%. More advantageously, after the volume of the transition cavity is reduced, the pressure recovery speed of the transition cavity and the connected control cavity is increased, the fuel cut of the fuel injector is rapid, and the post-combustion of the engine is good.

Drawings

FIG. 1 is a schematic diagram of a prior art fuel injector configuration;

FIG. 2 is a schematic diagram of the control circuit of the fuel injector

FIG. 3 is a schematic structural diagram of a preferred embodiment of the present invention

FIG. 4 is a partial enlarged view of an embodiment of the present invention

Fig. 5 is a force diagram of the needle valve sleeve.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Referring to fig. 2 to 5, an electric control fuel injector of an internal combustion engine with a single cylinder power of more than 100KW includes a fuel injector body, an electromagnetic valve, a control valve assembly installed in an installation cavity of the fuel injector body, a needle valve coupler, a needle valve spring 5c, and a needle valve body 5d, where the control valve assembly includes an electromagnetic valve 1, a built-in housing 6, a control valve plate 3, and a valve ball 2, and the electromagnetic valve 1 includes an electromagnet 1a and an armature assembly 1 b; the needle valve matching part 5 comprises a needle valve 5a and a needle valve sleeve 5b, the armature component adopts a split structure and comprises an armature 1c and an armature rod 1d, the upper end of the armature rod is inserted into a central hole of the electromagnet 1a, the lower end of the armature rod is inserted into the built-in shell 6, and the lower end of the armature rod is provided with a valve ball 2 which is abutted against the control valve plate through a valve ball pressing block 4; it is characterized in that; the volume cavity where the armature component 1b is positioned is a low-pressure cavity D; a transition oil passage hole 3b below a ball valve conical surface 3a on the control valve plate is a transition cavity; the prior art transition chamber consists of three oil gallery holes of diameter about 0.6mm and length about 5mm and transverse oil grooves. Preferably, the transition cavity is composed of an oil passage hole with the diameter of about phi 0.6mm and the length of about 4mm, so that the volume of the transition cavity is reduced to about 30% of the original volume, and the hydraulic response time of the pressure change of the transition cavity and the control cavity is improved; a volume cavity formed by the oil passage hole 3c of the control valve plate and the needle valve matching part 5 is a control cavity B; the annular volume between the oil passage hole 3d of the valve plate and the needle valve body 6 and the needle valve sleeve 5b is a pressure accumulation cavity A; an oil inlet orifice X for communicating the pressure accumulation cavity A with the control cavity B and an oil outlet orifice Y for communicating the control cavity B with the transition cavity C, wherein the oil inlet orifice X and the oil outlet orifice Y are both vertically arranged on the control valve plate; an auxiliary orifice Z communicating the accumulator chamber a and the transition chamber C is arranged obliquely on the control valve plate.

Preferably, the oil outlet orifice Y, the transition oil passage hole 3b and the ball valve conical surface 3a are coaxially arranged, so that the circumferential uniformity of high-speed fluid in the transition cavity is facilitated, and the corrosion effect on the ball valve conical surface 3a is reduced.

Preferably, the upper end surface d1 and the annular area with the diameter of the outer diameter d2 of the needle valve sleeve 5B are in contact with the lower end surface of the control valve plate, and the needle valve body cavity is isolated from the pressure accumulation cavity A and the control cavity B by the sealing effect under the action of hydraulic force and spring force; the inner diameter d1 of the annular surface at the upper end of the needle valve housing 5b is larger than the coupling surface diameter d of the needle valve coupling 5, and the eccentric oil outlet orifice Y is included in the circle of d 1. D1 and d in the prior art are approximately equivalent values; the present patent application d1 is significantly > d. The benefit of this is that the annular area between needle sleeves d1 and d, which is located in the control chamber, bears the hydraulic force Fc downward of the control chamber; the annular area between the lower end faces d2 and d of the needle valve sleeve bears the hydraulic force F of the pressure accumulation volume chamber. Because the pressure of the pressure storage cavity is greater than the pressure of the control cavity, and the annular area of d and d2 is greater than the annular area between d1 and d, the upper end sealing ring surface of the needle valve sleeve is subjected to a bending moment, the deformation uniformity of the sealing ring surface is facilitated, and the sealing effect is enhanced.

Compared with the prior art, the technical scheme of the utility model reduces the number of control valve seats and simultaneously reduces the processing difficulty and the processing cost. The utility model discloses the structure is arranged three orifice and control valve seat face on part of control valve plate to greatly reduced the volume of transition chamber to original about 30%. More advantageously, after the volume of the transition cavity is reduced, the pressure recovery speed of the transition cavity and the connected control cavity is increased, the fuel cut of the fuel injector is rapid, and the post-combustion of the engine is good.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. An electric control fuel injector of an internal combustion engine with a single cylinder with power larger than 100KW comprises a fuel injector body, an electromagnetic valve, a control valve component arranged in an installation cavity of the fuel injector body, a needle valve matching part, a needle valve spring (5c) and a needle valve body (5d), wherein the control valve component comprises an electromagnetic valve (1), a built-in shell (6), a control valve plate (3) and a valve ball (2), and the electromagnetic valve (1) comprises an electromagnet (1a) and an armature component (1 b); the needle valve matching part (5) comprises a needle valve (5a) and a needle valve sleeve (5b), the armature component adopts a split structure and comprises an armature (1c) and an armature rod (1d), the upper end of the armature rod is inserted into a central hole of the electromagnet (1a), the lower end of the armature rod is inserted into a built-in shell (6), and a valve ball (2) which is abutted to the control valve plate is installed at the lower end of the armature rod through a valve ball pressing block (4); it is characterized in that; the volume cavity where the armature component (1b) is located is a low-pressure cavity (D); a transition oil passage hole (3b) below a ball valve conical surface (3a) on the control valve plate is a transition cavity; a volume cavity formed by an oil passage hole (3c) of the control valve plate and the needle valve matching part (5) is a control cavity (B); an oil passage hole (3d) of the valve plate and an annular volume between the needle valve body (5d) and the needle valve sleeve (5b) are pressure accumulation cavities (A); the oil inlet throttling hole (X) is communicated with the pressure accumulation cavity (A) and the control cavity (B), the oil outlet throttling hole (Y) is communicated with the control cavity (B) and the transition cavity (C), and the oil inlet throttling hole (X) and the oil outlet throttling hole (Y) are vertically arranged on the control valve plate; and an auxiliary throttling hole (Z) for communicating the pressure accumulation cavity (A) and the transition cavity (C) is obliquely arranged on the control valve plate.

2. An electronic fuel injector of an internal combustion engine with a single cylinder power of more than 100KW according to claim 1, characterized in that: the oil outlet orifice Y is coaxially arranged with the transition oil passage hole (3b) and the ball valve conical surface (3 a).

3. An electronic fuel injector of an internal combustion engine with a single cylinder power of more than 100KW according to claim 2, characterized in that: the upper end surface of the needle valve sleeve (5B) is contacted with the lower end surface of the control valve plate, and the needle valve cavity is isolated into a pressure storage cavity (A) and a control cavity (B); the inner diameter of the upper end annular surface of the needle valve sleeve (5b) is larger than the diameter of the coupling surface of the needle valve coupling (5), and the eccentric oil outlet orifice (Y) is contained in the upper end annular surface of the needle valve sleeve (5 b).