CN201730718U

CN201730718U - Injection valve of electric control fuel injector

Info

Publication number: CN201730718U
Application number: CN2010201322334U
Authority: CN
Inventors: 肖亨琳
Original assignee: Wuxi Kipor Power Co Ltd
Current assignee: Wuxi Kipor Power Co Ltd
Priority date: 2010-08-05
Filing date: 2010-08-05
Publication date: 2011-02-02
Anticipated expiration: 2020-08-05

Abstract

The utility model relates to an injection valve of an electric control fuel injector, wherein a valve seat is installed on a restriction orifice; a shell is internally provided with a control piston which is provided with a pressure adjusting spring; one end of the control piston is connected with a mandril; the control piston is connected with an inject nozzle matching part through the mandril; the inject nozzle matching part is fixed on the shell through a cap nut; the injection valve is characterized in that a gland nut tightly presses the restriction orifice on the shell through a locating plate; the shell and the restriction orifice are in fit connection; an armature is installed in a guide seat and conducts reciprocating motion in the guide seat; an electromagnet cap nut enables an electromagnet, a backing ring and the guide seat to be tightly compressed and fixed on the shell; one part of a steel ball is pressed into the hole in the armature; an electromagnet spring is arranged on the armature; and the concave spherical surface of the valve seat is contacted with the part, extruding out of the armature, of the steel ball. The injection valve is simple, compact and reasonable structure, and can ensure the sealing property between the valve seat and the restriction orifice after being attached, reduce processing requirements on the valve seat and improve the sealing property of the injection valve.

Description

The injection valve of electric-controlled fuel injector

Technical field

The utility model relates to a kind of injection valve of electric-controlled fuel injector, especially a kind of injection valve of electric-controlled fuel injector of use for diesel engine.

Background technique

Electric-controlled fuel injector is the critical component of this system, it can realize the idealized control to fuel injection characteristic, in order to realize the quick opening and closing of electric-controlled fuel injector, utilize the pressure difference at control piston two ends to control opening and closing, characteristic according to liquid, utilize this principle to satisfy reflecting requirement fast fully to electric-controlled fuel injector, sealing for the control room that guarantees the control piston two ends, require very high to relevant workpiece, owing to there is numerous parts to fit together, the relative position degree is difficult to guarantee, in order to reach requirement, processing cost is very high, and it is very high to cut reject rate.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned deficiency, thereby a kind of injection valve of electric-controlled fuel injector is provided, and can guarantee the sealing after valve seat and restricting orifice are fitted, and has reduced the valve seat processing request, can improve the sealing of injection valve.

The technological scheme that provides according to the utility model, the injection valve of electric-controlled fuel injector comprises housing, restricting orifice, valve seat, control piston, described valve seat is installed on the restricting orifice, be provided with control piston in the described housing, control piston cooperates with housing, pressure adjusting spring is housed on the control piston, connect push rod on one end of control piston, and be connected with oil nozzle idol part by push rod, by tight cap oil nozzle idol part is fixed on the housing, feature is: gland nut is pressed on restricting orifice on the housing by positioning plate, housing and restricting orifice are fitted and connected, armature is installed in the guide holder, the to-and-fro motion in guide holder of described armature, and the very tight cap of electromagnetism is with electromagnet, grommet and guide holder compress and are fixed on the housing; A steel ball part is pressed in the hole of armature, and the electromagnet spring is arranged on the armature, and the concave spherical surface of valve seat contacts with the part of the outstanding armature of steel ball.

Be provided with very little gap between the other end of described control piston and restricting orifice.

Be provided with influent stream passage, return flow line, backflow throttle orifice, influent stream throttle orifice in the described housing, the influent stream passage is communicated with the influent stream throttle orifice, the backflow throttle orifice is communicated with the return flow line, return port is communicated with the backflow throttle orifice, highly pressurised liquid enters by control piston, return flow line by influent stream passage and influent stream throttle orifice, in the common control room that forms of housing and restricting orifice.

Compared with the prior art the utility model has the following advantages:

The utility model is simple, compact and reasonable for structure; Can guarantee the sealing after valve seat and restricting orifice are fitted, reduce, can improve the sealing of injection valve the valve seat processing request.

Description of drawings

Fig. 1 is the utility model structural representation.

Fig. 2 is the utility model electric-controlled fuel injector structural representation.

Embodiment

Embodiment during following the utility model is incited somebody to action in conjunction with the accompanying drawings is further described:

As Fig. 1～shown in Figure 2: comprise electromagnet 1, the very tight cap 2 of electromagnetism, electromagnet spring 3, armature 4, grommet 5, guide holder 6, gland nut 7, positioning plate 8, valve seat 9, restricting orifice 10, pressure adjusting spring 11, push rod 12, oil nozzle idol part 13, tight cap 14, housing 15, steel ball 16, backflow throttle orifice 17, return port 18, influent stream throttle orifice 19, control room 20, influent stream passage 21, control piston 22, return flow line 23.

The utility model adopts valve seat 9 to be installed on the restricting orifice 10, be provided with control piston 22 in the described housing 15, control piston 22 cooperates with housing 15, the flexibility that under oil tight prerequisite, keeps motion, pressure adjusting spring 11 is housed on the control piston 22, connect push rod 12 on one end of control piston 22, and be connected with oil nozzle idol part 13 by push rod 12, by tight cap 14 oil nozzle idol part 13 is fixed on the

housing

15,10 of the other end of control piston 22 and restricting orifices are provided with very little gap, gland nut 7 is pressed on restricting orifice 10 on the housing 15 by positioning plate 8, housing 15 and restricting orifice 10 are fitted and connected, and positioning plate 8 is positioned at correct position on the housing 15 with guide holder 6; Armature 4 is installed in the guide holder 6, armature 4 can to-and-fro motion in guide holder 6, armature 4 reciprocating distances are regulated by the thickness of the grommet 5 between armature 4 and the electromagnet 1, and the very tight cap 2 of electromagnetism compresses electromagnet 1, grommet 5 and guide holder 6 and be fixed on the housing 15; In housing 15, be provided with influent stream passage 21, return flow line 23, influent stream passage 21 is communicated with influent stream throttle orifice 19, highly pressurised liquid enters by control piston 22 by influent stream passage 21 and influent stream throttle orifice 19, return flow line 23, in housing 15 and the restricting orifice 10 common control rooms 20 that form, the part of steel ball 16 is pressed in the preformed hole of armature 4, steel ball 16 and armature 4 interference fit, electromagnet spring 3 is arranged on the armature 4, the concave spherical surface of valve seat 9 contacts with the part of steel ball 16 outstanding armature 4, pretightening force on the electromagnet spring 3 is vertically acted on valve seat 9 and restricting orifice 10 faying surfaces all the time, the sealing surface of valve seat 9 is greater than the sealing surface around the backflow throttle orifice, guaranteed the sealing after valve seat 9 is fitted with restricting orifice 10, reduced valve seat 9 processing requests.

When electromagnet 1 is not switched on, pretightening force on the electromagnet spring 3 acts on the armature 4, and valve seat 9 and restricting orifice 10 are fitted by steel ball 16, cut off in the control room 20 liquid and got back in the return flow line 23 by the backflow throttle orifice 17 that is arranged on restricting orifice 10; S in the control room 20 acts on the end face of control piston 22, s acts on the oil nozzle idol part 13 by influent stream passage 21, the power on the oil nozzle idol part 13 of acting on is less than the power that acts on control piston 22, and oil nozzle idol part 13 keeps closing.

When electromagnet 1 energising, electromagnetic force overcomes electromagnet spring 3 pretightening forces, with armature 4 adhesives, the pretightening force that acts on the valve seat 9 disappears, open at fluid pressure effect lower valve base 9, backflow throttle orifice 17 is communicated with return flow line 23, return port 18 is communicated with backflow throttle orifice 17, liquid in the control room 20 enters return flow line 23 by return port 18 to backflow throttle orifice 17, the liquid that flows into control room 20 is less than the liquid that flows out, fluid pressure reduces in the control room 20, the power that acts on oil nozzle idol part 13 this moment is greater than the power on the liquid effects control piston 22 in the control room 20, oil nozzle idol part 13 is opened under the fluid pressure effect, like this according to setting recursive opening and closing.

Claims

1. the injection valve of an electric-controlled fuel injector, it mainly comprises housing (15), restricting orifice (10), valve seat (9), control piston (22), described valve seat (9) is installed on the restricting orifice (10), be provided with control piston (22) in the described housing (15), control piston (22) cooperates with housing (15), pressure adjusting spring (11) is housed on the control piston (22), connect push rod (12) on one end of control piston (22), and be connected with oil nozzle idol part (13) by push rod (12), by tight cap (14) oil nozzle idol part (13) is fixed on the housing (15), it is characterized in that: gland nut (7) is pressed on restricting orifice (10) on the housing (15) by positioning plate (8), housing (15) is fitted and connected with restricting orifice (10), armature (4) is installed in the guide holder (6), described armature (4) to-and-fro motion in guide holder (6), the very tight cap of electromagnetism (2) is with electromagnet (1), grommet (5) and guide holder (6) compress and are fixed on the housing (15); Electromagnet spring (3) is arranged on the armature (4), and steel ball (a 16) part is pressed in the hole of armature (4), and the concave spherical surface of valve seat (9) contacts with the part of the outstanding armature (4) of steel ball (16).

2. the injection valve of electric-controlled fuel injector as claimed in claim 1 is characterized in that being provided with the gap between the other end of described control piston (22) and restricting orifice (10).

3. the injection valve of electric-controlled fuel injector as claimed in claim 1, it is characterized in that being provided with in the described housing (15) influent stream passage (21), return flow line (23), backflow throttle orifice (17), influent stream throttle orifice (19), influent stream passage (21) is communicated with influent stream throttle orifice (19), backflow throttle orifice (17) is communicated with return flow line (23), return port (18) is communicated with backflow throttle orifice (17), and highly pressurised liquid enters by control piston (22) by influent stream passage (21) and influent stream throttle orifice (19), return flow line (23), in the common control room (20) that forms of housing (15) and restricting orifice (10).