CN112096552A

CN112096552A - Parallel double-oil-duct valve body of high-pressure common rail oil sprayer

Info

Publication number: CN112096552A
Application number: CN202011045053.7A
Authority: CN
Inventors: 刘义亭; 吴小勇; 庄福如; 沙有胜; 鞠得雨; 王进; 钱音瑶; 赵波; 李明
Original assignee: Wuxi Gelin Baoer Technology Co ltd; Shandong Xin Ya Gelin Baoer Fuel System Co ltd
Current assignee: Wuxi Gelin Baoer Technology Co ltd; Shandong Xin Ya Gelin Baoer Fuel System Co ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2020-12-18

Abstract

A parallel double-oil-duct valve body of a high-pressure common-rail oil injector comprises a main oil inlet duct, an upper high-pressure oil duct, a lower high-pressure oil duct, a valve sleeve shaft shoulder hole, a central oil cavity, a valve sleeve matching hole, a valve rod hole, a pressure relief oil return hole and an oil outlet hole, wherein the upper high-pressure oil duct and the lower high-pressure oil duct are communicated with the main oil inlet duct, the lower high-pressure oil duct is communicated with a lower high-pressure cavity of an oil injection nozzle, the upper high-pressure oil duct is communicated with the central oil cavity, the upper end of the pressure relief oil return hole is arranged beside the inner side surface of the valve sleeve shaft shoulder hole, the lower end of the pressure relief oil return hole is communicated with. The high-pressure oil enters an oil injector body from a main oil inlet channel and then is isobaric and divided into two control oil paths which respectively enter an upper high-pressure cavity and a lower high-pressure cavity, and an electromagnet part controls a sealing ball to seal and close or open a conical surface on a valve sleeve, so that the pressure maintaining or reducing of the upper high-pressure cavity is realized through an oil outlet throttling hole.

Description

Parallel double-oil-duct valve body of high-pressure common rail oil sprayer

The technical field is as follows:

the invention relates to an electric control common rail type oil sprayer for a diesel engine, in particular to a valve body of the oil sprayer.

Background art:

the structure of the prior art fuel injector assembly is shown in fig. 1, and the operating principle of the fuel injector assembly is that whether high-pressure oil enters a nozzle tip high-pressure cavity or not is controlled by the up-and-down movement of an armature rod a 23.

The scheme has the following disadvantages: conical surface sealing is arranged between the armature rod A23 and the upper armature seat 26 and the lower armature seat 27, the requirements on manufacturing accuracy of the two conical surfaces symmetrically arranged on the armature rod A23, the manufacturing accuracy of the angles of the conical surfaces on the upper armature seat 26 and the lower armature seat 27 and the installation accuracy of the two conical surfaces are extremely high, if the coaxiality of the two conical surfaces arranged on the upper armature rod A23 and the lower armature seat has errors, the accuracy of sealing the two groups of conical surfaces is inevitably influenced, the processing accuracy of the armature rod A23, the upper armature seat 26 and the lower armature seat 27 is inevitably improved if the accuracy of sealing the two groups of conical surfaces is ensured, the manufacturing difficulty is increased, the manufacturing cost is increased, and the qualification rate of products is not high. The accuracy and stability of the conical surface sealing have great influence on the opening and closing of the injection;

secondly, conical surface sealing is arranged between the armature rod A23 and the lower armature seat 27, and after the conical surface sealing works for a long time, the conical surface sealing is easy to wear, so that the sealing performance is poor and the conical surface sealing is directly changed, thereby causing the consequences of the leakage quantity deterioration and the injection characteristic change of the fuel injector assembly.

And the armature rod A23 is matched with the upper armature seat 26 and the lower armature seat 27 by double coupling parts, so that the manufacturing cost is increased.

Because the high-pressure oil enters the oil nozzle after passing through the two conical surface seals between the armature rod A23 and the upper armature seat 26 and the lower armature seat 27, the opening and closing of oil injection have the delay phenomenon.

In order to overcome the defects of delayed opening time and closing time of oil injection, large loss of oil injection pressure, small oil injection power density and the like of the conventional high-pressure common rail oil injector, the applicant invents a quick-response high-pressure ball-controlled common rail oil injector which can be immediately opened or closed in the injection process of the common rail oil injector and eliminates various defects caused by the delay time of opening and closing, and a parallel double-oil-passage valve body with a special structure is one of key technologies.

The invention content is as follows:

the invention aims to provide a parallel double-oil-passage valve body of a high-pressure common rail oil injector.

The technical scheme adopted by the invention is as follows:

a parallelly connected double oil duct valve body of high pressure common rail injector, characterized by: the oil-gas separator comprises a main oil inlet channel, an upper high-pressure oil channel and a lower high-pressure oil channel, wherein the upper high-pressure oil channel and the lower high-pressure oil channel are communicated with the main oil inlet channel.

The parallel double-oil-passage valve body of the high-pressure common rail oil injector is optimized by the valve body structure, and further comprises a valve sleeve shaft shoulder hole, a central oil cavity, a valve sleeve matching hole, a valve rod hole, a pressure relief oil return hole and an oil outlet hole, wherein the lower high-pressure oil passage is communicated with a lower high-pressure cavity of an oil injection nozzle, the upper high-pressure oil passage is communicated with the central oil cavity, the valve sleeve matching hole and the valve rod hole are coaxially arranged from top to bottom, the upper end of the pressure relief oil return hole is arranged beside the inner side surface of the valve sleeve shaft shoulder hole, the lower end of the pressure relief oil return hole is communicated with the valve rod hole, and the oil outlet hole is.

The high-pressure oil enters an oil injector body from a main oil inlet passage and then is isobarically connected in parallel to be divided into two control oil paths, one control oil path enters an upper high-pressure cavity formed by matching a valve sleeve and a valve rod with the top surface from an upper high-pressure oil passage, and an electromagnet part controls a sealing ball to seal and close or open a conical surface on the valve sleeve, so that the pressure maintaining or pressure reducing of the upper high-pressure cavity is realized through an oil outlet orifice, and the changed stress state of the top of the valve rod is an upper force source for controlling the opening and closing of an oil nozzle needle valve;

the other path enters the lower high-pressure cavity from the lower high-pressure oil passage and always generates an upward hydraulic driving force F2 to the nozzle needle valve, when enough current is applied to the electromagnet part, the electromagnet part generates electromagnetic force on the armature, when the electromagnet overcomes the pre-tightening force of the electromagnet spring, the armature moves upwards to drive the armature rod to move upwards, the sealing ball is not mechanically sealed on the conical surface of the valve sleeve, the pressure relief channel of the oil outlet orifice is opened, because the valve sleeve is provided with an oil inlet orifice and an oil outlet orifice, the flow ratio k of the oil inlet orifice and the oil outlet orifice is 0.2< k <1, the pressure of the upper high-pressure cavity is gradually reduced, the downward hydraulic force F1 transmitted to the nozzle needle valve by the valve rod of the upper high-pressure cavity is gradually reduced, when the downward hydraulic force F1 transmitted to the nozzle needle valve by the valve rod of the upper high-pressure cavity, the downward pre-tightening force F3 transmitted to the nozzle needle, when the relationship with the upward hydraulic pressure F2 applied by the lower high-pressure cavity to the oil nozzle needle valve is F1+ F3 < F2, the oil nozzle needle valve moves upwards to leave the seat surface of the oil nozzle needle valve body, high-pressure oil entering from the lower high-pressure oil passage directly sprays oil, and when the electromagnet part is de-energized, the sealing ball is sealed and pressed on the conical surface on the valve sleeve under the action of the pretightening force of the electromagnet spring; the oil is cut off immediately, the response efficiency of oil injection and oil cut-off is improved, and the defects of the prior art are overcome ideally.

According to the working process and the working principle of the invention, the lower high-pressure oil duct is a channel for directly supplying oil after the nozzle needle valve is opened, and in the prior art, the high-pressure oil supply channel is arranged behind the armature rod, so that the late phenomena of oil injection and oil cut exist, and the power output, the fuel consumption and the exhaust emission index of the diesel engine are directly influenced. The invention adopts the parallel oil control principle, and the upper high-pressure oil passage adopts spherical sealing, thus having long service life, high reliability, sensitive and broken oil injection and oil cut conversion, and light and sensitive armature suction and discharge.

Description of the drawings:

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

FIG. 2 is a schematic diagram of a high pressure common rail injector embodying the present invention;

FIG. 3 is a schematic structural view of the present invention;

FIG. 4 is a schematic view of the construction of an armature rod;

FIG. 5 is a schematic view of the armature;

FIG. 6 is a top view of FIG. 5;

FIG. 7 is a schematic structural view of the lower guide base of the armature rod;

FIG. 8 is a top view of FIG. 7;

fig. 9 is a schematic view of the valve sleeve construction;

FIG. 10 is a schematic view of the valve sleeve in engagement with the valve stem;

in fig. 1: 20-a transition plate; 21-electromagnet part a; 22-electromagnet spring a; 23-armature bar a; 24-armature a; 25-a compression screw; 26-an upper armature seat; 27-lower armature seat; 28-injector body a; 29-a choke stop lever; 11A-a transition block; 11-a nipple spring; 12-glib needle valve body; 13-nozzle needle valve;

in fig. 2-10, 1-the electromagnet member; 2-electromagnet spring; 3-an armature rod; 4-an armature; 5-a damping spring; 6-ball seat; 7-a sealing ball; 8-valve sleeve; 9-a valve stem; 10-an injector body; 11-a nipple spring; 12-glib needle valve body; 13-nozzle needle valve; 14-an armature rod lower guide seat; 15-high pressure seal ring; 16-lower high pressure chamber; 31-a spring positioning section; 32-an upper guide section; 33-a middle guide section; 34-a lower guide section; 41-adsorption disc; 42-a guide post; 43-a pilot hole; 44-weight reduction slots; 80-valve sleeve shoulder; 81-oil outlet orifice; 82-an oil intake orifice; 83-a conical surface; 84-lower end face; 85-cylindrical surface; 86-upper high pressure chamber; 87-valve stem mounting hole; 101-a main oil inlet channel; 102-upper high pressure oil duct; 103-lower high pressure oil duct; 104-valve sleeve shaft shoulder hole; 105-a central oil chamber; 106-a valve housing mating bore; 107-valve stem bore; 108-pressure relief oil return hole; 109-oil outlet holes; 141-inner concave screwing inner hole; 142-armature rod guide holes; 143-external thread; 144-vertical pressure relief vent; 145-horizontal relief hole; 146-a pillar body; 147-taper hole.

The specific implementation mode is as follows:

the following description of the embodiments of the invention is provided by way of example in conjunction with the accompanying drawings:

example 1:

a rapid response type high-pressure ball control common rail oil injector adopting the invention is disclosed as shown in figures 2-10, and comprises an electromagnet component 1, an electromagnet spring 2, an armature rod 3, an armature 4, a damping spring 5, a ball seat 6, a sealing ball 7, a valve sleeve 8, a valve rod 9, an oil injector body 10, an oil nozzle spring 11, an oil nozzle needle valve body 12, an oil nozzle needle valve 13, an armature rod lower guide seat 14 and a high-pressure sealing ring 15, wherein the armature rod 3 comprises a spring positioning section 31, an upper guide section 32, a middle guide section 33 and a lower guide section 34, the spring positioning section 31, the upper guide section 32, the middle guide section 33 and the lower guide section 34 are coaxially distributed from top to bottom in sequence, the electromagnet spring 2 is placed between the end face of a concave hole of the electromagnet component 1 and the armature rod 3, the outer diameter of the spring positioning section 31 is in clearance fit with the inner diameter of the electromagnet spring 2, the outer diameter of the upper guide section 32 is in coupling fit with the electromagnet component 1, the outer diameter of the middle guide section 33 is matched with the guide hole 43 of the armature 4 by a matching part, and the outer diameter of the lower guide section 34 is matched with the armature rod guide hole 142 of the armature rod lower guide seat 14 by a matching part; the valve sleeve 8 and the valve rod 9 are matched by a matching part; an oil outlet orifice 81, an oil inlet orifice 82, a conical surface 83, a lower end surface 84 and a cylindrical surface 85 are arranged on the valve sleeve 8, the oil outlet orifice 81 and the conical surface 83 are arranged at the center of the top of the valve sleeve shaft shoulder 80, and the oil outlet orifice 81 is arranged at the bottom of the conical surface 83 and communicated with the valve rod mounting hole 87; the oil inlet orifice 82 is arranged on the mating shaft and is positioned at the top of the valve rod mounting hole 87, and the flow ratio k of the oil inlet orifice 82 to the oil outlet orifice 81 under the same hydraulic pressure is: 0.2< k < 1; a sealing structure is formed between the sealing ball 7 and the conical surface 83; a main oil inlet channel 101, an upper high-pressure oil channel 102, a lower high-pressure oil channel 103, a valve sleeve shaft shoulder hole 104, a central oil cavity 105, a valve sleeve matching hole 106, a valve rod hole 107, a pressure relief oil return hole 108 and an oil outlet hole 109 are designed on the oil injector body 10, the main oil inlet channel 101 is communicated with the upper high-pressure oil channel 102 and the lower high-pressure oil channel 103, the valve sleeve shaft shoulder hole 104, the central oil cavity 105, the valve sleeve matching hole 106 and the valve rod hole 107 are coaxially arranged from top to bottom, the upper end of the pressure relief oil return hole 108 is arranged beside the inner side surface of the valve sleeve shaft shoulder hole 104, the lower end of the pressure relief oil return hole 108 is communicated with the valve rod hole 107, the oil outlet hole 109 is arranged on the side surface of the oil injector body 10 and communicated with the valve rod hole 107, the upper high-pressure oil channel 102 is communicated with the central oil cavity 105, and the lower end surface; the high-pressure sealing ring 15 is arranged between the cylindrical surface 85 of the valve sleeve 8 and the central oil cavity 105 of the oil injector body 10 in a sealing manner; the damping spring 5 is sleeved on the guide post 42 of the armature iron 4 and is arranged in an inward concave screwing inner hole 141 of the armature rod lower guide seat 14; an upper high-pressure cavity 86 is formed at the top of the matched valve sleeve 8 and valve rod 9, and a lower high-pressure cavity 16 is formed after the matched glib talker needle valve body 12 and glib talker needle valve 13; the large outer circle diameter d1 of the valve rod 9 is larger than the large outer circle diameter d2 of the oil nozzle needle valve 13;

the armature 4 comprises an adsorption disc 41, a guide post 42, a guide hole 43 and a weight reduction groove 44, wherein the adsorption disc 41, the guide post 42 and the guide hole 43 are coaxially arranged, the adsorption disc 41 is arranged above the guide post 42, the guide hole 43 is arranged at the center positions of the adsorption disc 41 and the guide post 42, the weight reduction grooves 44 are arranged at equal intervals along the circumferential direction of the adsorption disc 41, and the guide hole 43 is matched with the lower guide section 34 of the armature rod 3 through a coupling piece.

The armature rod lower guide seat 14 comprises an inner concave screwing inner hole 141, an armature rod guide hole 142, an external thread 143, a vertical pressure relief hole 144, a horizontal pressure relief hole 145 and a column body 146, wherein the inner concave screwing inner hole 141 and the armature rod guide hole 142 are coaxially arranged at the central position of the column body 146, the armature rod guide hole 142 is positioned below the inner concave screwing inner hole 141, the external thread 143 is arranged on the outer circumference of the upper section of the column body 146, the four vertical pressure relief holes 144 are circumferentially distributed on the outer side of the armature rod guide hole 142, the four horizontal pressure relief holes 145 are circumferentially and uniformly arranged on the side surface of the lower section of the column body 146, and the vertical pressure relief holes 144 are communicated with the horizontal pressure relief hole 145. The lower ends of the vertical pressure relief holes 144 are communicated with the conical surface 83 at the top end of the valve sleeve 8. The lower end surface of the armature rod lower guide seat 14 is provided with a taper hole 147, the lower ends of the vertical pressure relief holes 144 are communicated with the taper hole 147, and the taper hole 147 corresponds to the taper surface 83 at the top end of the valve sleeve 8.

The common rail fuel injector designed by the invention has the working process that:

the high-pressure fuel is divided into two paths from a main oil inlet channel 101 of the injector body 10, one path enters an upper pressure cavity 86 formed by the matching top surfaces of the valve sleeve 8 and the valve rod 9 from an upper pressure oil channel 102, and the other path enters a lower pressure cavity 16 from a lower pressure oil channel 103.

When the electromagnet component 1 is de-energized, the sealing ball 7 is pressed on the conical surface 83 of the valve sleeve 8 in a sealing way under the action of the pretightening force of the electromagnet spring 2, the pressure relief channel of the oil outlet orifice 81 is closed, because the major circle outer diameter d1 of the valve rod 9 is larger than the major circle outer diameter d2 of the oil nozzle needle valve 13, the downward hydraulic force F1 of the oil nozzle needle valve 13 is transmitted to the upper high pressure cavity 86 through the valve rod 9, the downward pretightening force F3 of the oil nozzle needle valve 13 is transmitted to the oil nozzle spring 11, and the relationship between the upward hydraulic force F2 applied to the oil nozzle needle valve 13 by the lower high pressure cavity 16 is as follows: f1+ F3 is greater than F2, the nozzle needle valve 13 is sealed on the seat surface of the nozzle needle valve body 12, and the oil injector does not inject oil;

when sufficient current is applied to the electromagnet component 1, the electromagnet component 1 generates electromagnetic force action on the armature 4, when the electromagnet overcomes the pre-tightening force of the electromagnet spring 2, the armature 4 moves upwards to drive the armature rod 3 to move upwards, the sealing ball 7 is not mechanically sealed on the conical surface 83 on the valve sleeve 8, the pressure relief channel of the oil outlet orifice 81 is opened, as the valve sleeve 8 is provided with the oil inlet orifice 82 and the oil outlet orifice 81, the flow ratio k of the oil inlet orifice 82 and the oil outlet orifice 81 is 0.2< k <1, the pressure of the upper high pressure chamber 86 is gradually reduced, the downward hydraulic pressure F1 of the upper high pressure chamber 86 transmitted to the nozzle needle valve 13 through the valve rod 9 is gradually reduced, when the downward hydraulic pressure F1 of the upper high pressure chamber 86 transmitted to the nozzle needle valve 13 through the valve rod 9, the downward pre-tightening force F3 of the nozzle needle valve 13 transmitted by the nozzle spring 11, and the upward hydraulic pressure F2 applied to the nozzle needle valve 13 by the lower high pressure chamber 16 are in the relationship of F1+ F3 + F2, the nozzle needle 13 moves upwards to leave the seat surface of the nozzle needle valve body 12, and the oil injector injects oil.

The embodiments of the present invention are not listed one by one, and all schemes of the present invention, which adopt the function replacement, etc., are within the protection scope of the present invention.

Claims

1. A parallelly connected double oil duct valve body of high pressure common rail injector, characterized by: the oil-gas separator comprises a main oil inlet channel (101), an upper high-pressure oil channel (102) and a lower high-pressure oil channel (103), wherein the upper high-pressure oil channel (102) and the lower high-pressure oil channel (103) are communicated with the main oil inlet channel (101).

2. The parallel double oil passage valve body of the high pressure common rail injector according to claim 1, characterized in that: the oil injection valve further comprises a valve sleeve shaft shoulder hole (104), a central oil cavity (105), a valve sleeve matching hole (106), a valve rod hole (107), a pressure relief oil return hole (108) and an oil outlet hole (109), wherein a lower high-pressure oil duct (103) is communicated with a lower high-pressure cavity (16) of the oil injection nozzle, an upper high-pressure oil duct (102) is communicated with the central oil cavity (105), the valve sleeve matching hole (106) and the valve rod hole (107) are coaxially arranged from top to bottom, the upper end of the pressure relief oil return hole (108) is arranged beside the inner side face of the valve sleeve shaft shoulder hole (104), the lower end of the pressure relief oil return hole (108) is communicated with the valve rod hole (107), and the oil outlet hole (109) is arranged on the side face of the oil injector body (10) and is communicated with the.