CN209293946U - Common-rail injector structure - Google Patents

Abstract

The utility model discloses common-rail injector structures, including solenoid valve, magnetic valve spring gasket, magnetic valve spring, spool, armature, oil injector body, ball seat, ball sealer, it further include armature gasket, clamp nut, magnetic valve spring, spool, armature, armature gasket, clamp nut, ball seat, ball sealer is set in the cavity of oil injector body, ball sealer and ball seat cooperate, ball seat and spool lower end cooperate, spool upper end and magnetic valve spring lower end cooperate, magnetic valve spring upper end and magnetic valve spring gasket cooperate, the connection of the valve seat of magnetic valve spring gasket upper surface and solenoid valve, armature is connect with spool, the connection of the inner cavity end face of armature gasket and oil injector body, the inner hole of clamp nut and oil injector body is by being threadedly engaged connection, armature is set between the lower end surface of solenoid valve and the upper surface of armature gasket, armature and solenoid valve lower end surface Between be equipped with axial gap, axial gap be greater than armature setting lift.It is able to ascend the response speed of solenoid valve, improves fuel injector performance.

Description

Common-rail injector structure

Technical field

The utility model relates to Diesel Engine Technique Field more particularly to a kind of common-rail injector structures.

Background technique

Increasingly stringent with diesel engine emissions regulations, Electronic-Controlled High-Pressure Common Rail Injection system is gradually instead of mechanical Injection system, the most important part of common rail system is common-rail injector, and existing frequently-used common-rail injector is basic in principle All it is identical: electromagnetic force is generated by solenoid valve, armature turns on the switch valve under electromagnetic force, is opened using upper and lower pressure difference Needle-valve in injector nozzle matching parts realizes oil spout.

In the fuel injector product of the prior art, the effect of armature in addition to bear electromagnetic force to movable valve plug it is mobile come open, It closes other than valve, another function is to limit the movement lift of spool, that is, hit when armature reaches top dead centre with electromagnetic valve components Realize limit.In fuel injector service life, frequent movement, which is hit, needs the higher hardness of armature to reduce abrasion.It is existing Fuel injector armature material, if there is a problem of that magnetic permeability is low using spring steel or bearing steel；If using magnetically soft alloy, Although the low height of its magnetic permeability, the response speed of solenoid valve can be promoted, and then improve fuel injector performance, soft magnetic materials hardness compared with It is low, it cannot hit during the motion.

Utility model content:

The utility model is exactly to provide a kind of new common-rail injector knot to overcome the above problem of the existing technology Structure；It is not contacted with any object in addition to spool during the armature motion of the utility model, solves spool during the motion Have to select asking for hardness height but the low material of magnetic permeability because hitting due to limit exists and frequently hits by armature and electromagnetic valve components Topic, the magnetically soft alloy that magnetic permeability can be selected high improve fuel injector performance to promote the response speed of solenoid valve.

A kind of common-rail injector structure, including solenoid valve, magnetic valve spring gasket, magnetic valve spring, spool, armature, spray Oily body, ball seat, ball sealer further includes armature gasket, clamp nut, the magnetic valve spring, spool, armature, armature gasket, Clamp nut, ball seat, ball sealer are set in the cavity of oil injector body, and ball sealer and ball seat cooperate, and ball seat and spool lower end cooperate, Spool upper end and magnetic valve spring lower end cooperate, and magnetic valve spring upper end and magnetic valve spring gasket cooperate, magnetic valve spring pad The connection of the valve seat of piece upper surface and solenoid valve, armature are connect with spool, the inner cavity end face connection of armature gasket and oil injector body, pressure The inner hole of tight nut and oil injector body is set to the lower end surface of solenoid valve and the upper end of armature gasket by being threadedly engaged connection, armature Between face, axial gap h1 is equipped between armature and the lower end surface of solenoid valve, armature sets lift as h2, and h1 is greater than h2.

The armature gasket is along two different holes of size are axially arranged with, and the axis of aperture is overlapped with valve core axis, macropore Axis and valve core axis it is eccentric, aperture is connected with macropore；The spool is equipped on the cylindrical surface cooperated with armature gasket The line distance d that annular groove, aperture and macropore connect place is greater than the groover rot diameter of spool annular groove, and orifice size is greater than annular The groover rot diameter of slot and be less than cylindrical surface position outer dimension, big pore size be greater than cylindrical surface position size, annular groove The lower end surface cooperation of the cooperation of the upper surface of upper limit plane and armature gasket, lower limit plane and armature gasket realizes that the axial of spool is moved Dynamic limit.The aperture of annular groove slot bottom and armature gasket cooperates when work.

The aperture, macropore are circular hole, and aperture can be connect with macropore by transitional pore, and in assembly, spool is first passed through Side macropore passes through armature gasket, and sidesway in this way limits valve core movement by intermediate aperture to central small hole again.

The material of the armature is magnetically soft alloy, consistent with core material in solenoid valve, can be improved the response of fuel injector Speed.

The ball sealer is Ceramic Balls.

The beneficial effects of the utility model are:

1. due to being equipped with axial gap h1, the setting liter of armature between the armature of the utility model and the lower end surface of solenoid valve Journey is h2, and axial gap h1 is greater than setting lift h2, and armature is combined together with spool by welding or interference, with spool Combined armature does not contact during the motion with any object, therefore solves spool during the motion because by rank Iron and electromagnetic valve components, which hit limit, to be there are problems that frequently hitting and has to select hardness height but the low material of magnetic permeability, can be with The magnetically soft alloy for selecting magnetic permeability high improves fuel injector performance to promote the response speed of solenoid valve.

2. since the armature gasket cooperates along two different holes of size, spool is axially arranged with armature gasket Cylindrical surface be equipped with annular groove, the line distance d of aperture and macropore intersection is greater than the groover rot diameter of the annular groove of spool, small Pore size is greater than the groover rot diameter of annular groove and the outer dimension less than cylindrical surface position, big pore size are greater than cylindrical surface position Size, upper surface cooperation, lower limit plane and the lower end surface of armature gasket of the upper limit plane and armature gasket of annular groove cooperate in fact The axial movement limit of existing spool, the aperture of annular groove slot bottom and armature gasket cooperates when work, and armature gasket is fixed on oil spout On the inner cavity end face of body, structure is simple, and fixed and limit is reliable, guarantee during armature motion in addition to being connect with spool not with Any object contact.

3. aperture, macropore are circular hole and connect, in assembly, spool first passes through side macropore and passes through armature gasket again Sidesway in this way limits valve core movement by intermediate aperture to central small hole, structure and the processing is simple, manufacturing cost It is low, easy disassembly and replacement.

Detailed description of the invention

The utility model is described further with reference to the accompanying drawings and examples:

Fig. 1 is the structural schematic diagram of the utility model；

Fig. 2 is spool and armature gasket fit structure schematic diagram；

Fig. 3 is armature gasket construction schematic diagram.

In figure, 1, solenoid valve, 3, magnetic valve spring, 4, spool, 5, armature, 6, armature gasket, 7, clamp nut, 8, spray Oily body, 9, ball seat, 10, ball sealer.

Specific embodiment

In order to make those skilled in the art more fully understand the technical solution in the utility model, below in conjunction with this reality With the attached drawing in new embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that The described embodiments are only a part of the embodiments of the utility model, instead of all the embodiments.

As shown in Figure 1-Figure 3, a kind of new common-rail injector structure, including solenoid valve 1, magnetic valve spring gasket 2, electromagnetism Valve spring 3, spool 4, armature 5, armature gasket 6, clamp nut 7, oil injector body 8, ball seat 9, Ceramic Balls 10.The solenoid valve bullet Spring 3, spool 4, armature 5, armature gasket 6, clamp nut 7, ball seat 9, ball sealer 10 are set in the cavity of oil injector body 8, sealing Ball 10 is Ceramic Balls.

Ceramic Balls and ball seat 9 cooperate, and ball seat 9 and 4 lower end of spool cooperate, and 4 upper end of spool is matched with 3 lower end of magnetic valve spring It closes, 3 upper end of magnetic valve spring and magnetic valve spring gasket 2 cooperate, the valve seat 11 of 2 upper surface of magnetic valve spring gasket and solenoid valve Connection, armature 5 are connect with spool 4, and armature gasket 6 is connect with the inner cavity end face of oil injector body 8, clamp nut 7 and oil injector body 8 Inner hole by being threadedly engaged connection, armature 5 is between the lower end surface of solenoid valve 1 and the upper surface of armature gasket 6.

Axial gap h1 is equipped between armature 5 and the lower end surface of solenoid valve 1, armature 5 sets lift as h2, axial gap H1 is greater than setting lift h2.Armature is combined together with spool by welding or interference, with the combined rank of spool Iron does not contact during the motion with any object.

The armature gasket 6 along being axially arranged with two different holes of size, i.e. aperture 61, macropore 62, aperture 61 Axis is overlapped with 4 axis of spool, and 62 axis of macropore and 4 eccentric axis of spool, aperture 61 are connected with macropore 62；The spool 4 Be equipped with annular groove 41 at the cylindrical surface position 40 cooperated with armature gasket 6, aperture 61 and macropore 62 connect the line of position away from Groover rot diameter from the annular groove that d is greater than spool 4,61 size of aperture are greater than the groover rot diameter of annular groove 41 and are less than cylindrical surface The outer dimension at position 40,62 size of macropore are greater than the size at cylindrical surface position 40, the upper limit plane 42 and gag bit pad of annular groove Upper surface cooperation, lower limit plane 43 and the axial movement of the lower end surface cooperation realization spool 4 of armature gasket 6 of piece 6 limit.Work When annular groove 41 slot bottom and armature gasket 6 aperture 61 cooperate.

Aperture 61, macropore 62 are circular hole and connect, and in assembly, spool 4 first passes through side macropore 62 across armature Sidesway in this way limits the movement of spool 4 by intermediate aperture 61 to central small hole 61 gasket 6 again.

The material of the armature 5 is magnetically soft alloy, consistent with core material in solenoid valve, can be improved the response of fuel injector Speed.Magnetically soft alloy is a kind of alloy in low-intensity magnetic field with high magnetic permeability and low-coercivity.It is easy under external magnetic field Magnetization removes magnetic induction intensity basic disappearance again behind magnetic field, and magnetic hystersis loss is small, improves solenoid valve fuel factor, is very suitable to As armature material.

The entire motion process of the utility model describes:

When 1 no power of solenoid valve, magnetic valve spring 3 compresses downwards spool 4 under pretightning force effect, and spool 4 is applied to ball On seat 9 and Ceramic Balls 10, to realize the sealing to oil return of oil injector.Solenoid valve 1 generates electromagnetic force, 5 stress of armature after being powered Band movable valve plug 4 overcomes 3 resistance of magnetic valve spring to move upwards afterwards.By gag bit pad after spool 4, which moves upwards, passes by h2 distance The limit of aperture 61 on piece 6 and stop motion, because gap h1 is greater than lift h2, in entire motion process, armature 5 do not contact with solenoid valve 1 and the generation of armature gasket 6.When 1 no power of solenoid valve, effect of the spool 4 in magnetic valve spring power 3 Lower band moving armature 5 moves downward, and pushes down ball seat 9 and Ceramic Balls 10.

Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work The range of the utility model protection all should belong in every other embodiment obtained.

Claims (5)

1. a kind of common-rail injector structure, including solenoid valve, magnetic valve spring gasket, magnetic valve spring, spool, armature, oil spout Body, ball seat, ball sealer, characterized in that further include armature gasket, clamp nut, the magnetic valve spring, spool, armature, rank Iron gasket, clamp nut, ball seat, ball sealer are set in the cavity of oil injector body, and ball sealer and ball seat cooperate, under ball seat and spool End cooperation, spool upper end and magnetic valve spring lower end cooperate, and magnetic valve spring upper end and magnetic valve spring gasket cooperate, solenoid valve The connection of the valve seat of spring shim upper surface and solenoid valve, armature are connect with spool, the inner cavity end face of armature gasket and oil injector body The inner hole of connection, clamp nut and oil injector body is set to lower end surface and the gag bit pad of solenoid valve by being threadedly engaged connection, armature Between the upper surface of piece, axial gap h1 is equipped between armature and the lower end surface of solenoid valve, armature sets lift as h2, axially Gap h1 is greater than setting lift h2.

2. common-rail injector structure as described in claim 1, characterized in that big along size is axially arranged in the armature gasket Small two different holes, the axis of aperture are overlapped with valve core axis, and big axially bored line and valve core axis are eccentric, and aperture intersects with macropore It connects；The spool is equipped with annular groove, the line distance d of aperture and macropore junction at the cylindrical surface position cooperated with armature gasket Greater than the groover rot diameter of the annular groove of spool, orifice size is greater than the groover rot diameter of annular groove and is less than the shape at cylindrical surface position Size, big pore size are greater than the size at cylindrical surface position, the upper limit plane of annular groove and the upper surface cooperation of armature gasket, lower limit The lower end surface cooperation of plane and armature gasket realizes that the axial movement of spool limits, annular groove slot bottom and armature gasket when work Aperture cooperation.

3. common-rail injector structure as claimed in claim 2, characterized in that the aperture, macropore are circular hole and connect, In assembly, spool first passes through side macropore, and across armature gasket, sidesway passes through intermediate aperture pair to central small hole so again Valve core movement is limited.

4. common-rail injector structure as described in claim 1, characterized in that the material of the armature is magnetically soft alloy, with electricity Core material is consistent in magnet valve, can be improved the response speed of fuel injector.

5. common-rail injector structure as described in claim 1, characterized in that the ball sealer is Ceramic Balls.