KR101626300B1

KR101626300B1 - Injector

Info

Publication number: KR101626300B1
Application number: KR1020150081371A
Authority: KR
Inventors: 김동조; 장재황; 임종완
Original assignee: 동방테크 주식회사
Priority date: 2015-06-09
Filing date: 2015-06-09
Publication date: 2016-06-14

Abstract

An object of the present invention is to provide an injector which can improve the strength of a plunger by improving the transmission of magnetic force to the plunger, thereby reducing the number of parts and preventing the vacuum state of the upper portion of the plunger. A solenoid valve for injecting gaseous fuel according to an operation of the solenoid valve, the solenoid valve including a bobbin and a coil including a coil wound on the bobbin, The bobbin is inserted into the bobbin, and the bobbin is inserted into the bobbin. The bobbin is inserted into the bobbin. The bobbin is inserted into the bobbin. Rises toward the core side, and the coil assembly And a plunger in which the outer circumferential surface is lowered on the inner circumferential surface of the bobbin by elastic force when the current is interrupted, wherein the nozzle housing is formed with at least one fuel supply hole, and the inner diameter is formed to coincide with the inner diameter of the bobbin, And a fuel supply hole communicating with the fuel supply hole in accordance with the rising of the plunger to enable injection of the gaseous fuel, Wherein the plunger has a first circulation conduit formed at an upper portion thereof so as to communicate with an upper portion and a lower portion along a longitudinal direction of the plunger, the outer circumferential surface of the plunger being lifted and lowered along the inner circumferential surface of the bobbin and the body, 1, an upper portion of the circulation duct is provided with a spring for providing an elastic force for lowering the plunger And a lower body formed at a lower portion of the upper body and having an outer diameter relatively smaller than an outer diameter of the upper body and having a second circulation conduit communicating the first circulation conduit with the outside, The space formed by the outer diameter difference between the body and the lower body and the first circulation conduit and the second circulation conduit are communicated with each other to circulate the gaseous fuel flowing between the plunger and the core to prevent the generation of vacuum due to the lifting of the plunger And an upper seat is provided on the upper surface of the upper body to mitigate the impact with the core due to the rise of the plunger and to mitigate airtightness and impact with the nozzle due to the lowering of the plunger on the lower surface of the lower body A mounting groove portion in which the lower sheet is installed is formed, and a protruding ring portion is formed on the lower surface of the lower sheet so as to be convex along the circumference, Wherein the bobbin and the body are provided with a plurality of bosses and a plurality of bosses in the body along the inner circumference of each of the bobbin and the body, And a pneumatic pressure supply pipe for communicating the respective pockets with a pipe for supplying the gaseous fuel to the fuel supply hole. The orifice is provided at each of the pocket-side ends of the pneumatic supply pipe, And a check valve is provided at one side of the pneumatic conduit so that the gaseous fuel can flow only to the pocket side.

Description

Injector

The present invention relates to an injector, and more particularly, to an injector for supplying a gaseous fuel such as liquefied natural gas or compressed natural gas to an engine of a vehicle.

Generally, an injector for supplying a gaseous fuel of a vehicle is configured to inject gaseous fuel into an engine by a signal from an ECU (Electronic Control Unit).

As shown in FIG. 1 showing a conventional injector, a conventional injector is constituted by inserting a solenoid valve 20 and a nozzle 30 into a terminal 10, and a bobbin 21, in which a coil of a solenoid valve is held, The core 22 is fixed to the upper side of the guide G while the lower side of the guide G is lifted by the magnetic force and descended by the elastic force, (Not shown).

This conventional insert has a structure in which a guide G is coupled to the bobbin 21 so that current flows through the coil of the bobbin 21 and the plunger 23 is lifted by the magnetic force generated by the core 22, There is a problem that the magnetic force for lifting the plunger 23 is weakened due to the gap G.

Further, as the number of parts such as the disk D for coupling and supporting the guide G increases, and as the number of the parts to be coupled increases, the parts are inserted into the terminal 10, There is a problem that a tolerance is increased due to damage or an increase of a bonding site, and thus a malfunction occurs.

Further, a vacuum state is generated between the plunger 23 and the core 22 when the plunger 23 is moved up and down, and the nozzle 30 can not be opened and closed smoothly.

Accordingly, it is necessary to develop a technique capable of overcoming the above problems.

Korean Patent Registration No. 10-1156453 entitled "compressed natural gas fuel supply device"

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the above problems of the related art, and it is an object of the present invention to provide an injector capable of improving the strength of a plunger by improving magnetic force transmission to a plunger, The purpose.

Another object of the present invention is to provide an injector capable of preventing the vacuum state of the upper portion of the plunger.

According to an aspect of the present invention, there is provided an injector including a solenoid valve and a nozzle housing installed at a lower portion of the solenoid valve to inject gaseous fuel according to an operation of the solenoid valve, A core inserted in the upper side of the bobbin and inserted into the bobbin so that an outer circumferential surface of the coil is in contact with an inner circumferential surface of the bobbin, and a core inserted in the lower side of the bobbin, And a plunger whose outer circumferential surface rises to the core side on the inner circumferential surface of the bobbin when the current flows and the outer circumferential surface of the plunger descends on the inner circumferential surface of the bobbin due to the elastic force when the coil assembly is cut off, A fuel supply hole is formed, A body which is formed so as to coincide with an inner diameter of the bean and is lifted up and down by an outer circumferential surface of the plunger on an inner circumferential surface thereof and is inserted into a lower side of the body to communicate with the fuel supply hole along with the rising of the plunger, And a nozzle interposed between the fuel supply hole and the plunger, wherein the plunger has an outer circumferential surface elevated and lowered along the inner circumferential surface of the bobbin and the body, An upper body formed with a first circulation conduit and a spring provided on an upper side of the first circulation conduit to provide an elastic force for lowering the plunger and an upper body having a lower outer diameter than an outer diameter of the upper body, And a second circulation conduit for communicating the first circulation conduit with the outside is formed, The space formed by the outer diameter difference between the upper body and the lower body and the first circulation conduit and the second circulation conduit are communicated with each other to circulate the gaseous fuel flowing between the plunger and the core to prevent the generation of vacuum due to the lifting and lowering of the plunger And an upper sheet is provided on the upper surface of the upper body so as to mitigate the impact with the core due to the rise of the plunger. The lower surface of the lower body has airtightness with the nozzle due to the descent of the plunger, And a protruding ring is formed on the lower surface of the lower sheet so as to be convex along the circumference to improve airtightness. The bobbin and the body are provided with a plurality of protrusions And a plurality of pores are formed along the inner periphery, and the pores are formed in the inner circumferential surface at a predetermined depth to form a pneumatic bearing by the gaseous fuel And a pneumatic supply pipe passage for communicating the respective pockets with the pipe for supplying the gaseous fuel to the fuel supply hole are provided in the pneumatic pressure supply pipe, and an orifice is provided at each of the pocket- And a check valve is provided at one side of the pneumatic conduit so that the gaseous fuel can flow only to the pocket side.

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As described above, according to the present invention, the following effects can be expected.

By improving the lifting force of the plunger, it is possible to control the injection amount without malfunction in the process of injecting the gaseous fuel in the high pressure state, and it is possible to reduce the dimension of the plunger compared to the conventional one, and thus the light weight of the injector can be realized.

Further, since the number of parts can be reduced, it is possible to reduce the joint area and to reduce the tolerance and to reduce the incidence of erroneous operation in the insert injection molding.

In addition, it is possible to prevent the vacuum state between the plunger and the core from being generated, thereby preventing malfunction of the injector.

1 is a sectional view of a conventional injector.
2 is a cross-sectional view of an injector according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIG. 2, which is a cross-sectional view of the present invention.

The injector according to the present invention injects gaseous fuel into an engine of a vehicle and includes a solenoid valve 300 and a nozzle installed at a lower portion of the solenoid valve 300 to inject gas fuel according to the operation of the solenoid valve 300. [ The housing 500 is inserted into the terminal.

The solenoid valve 300 generates a magnetic force to open or block the nozzle 530 installed in the nozzle housing 500 to supply the gas fuel in a predetermined amount as much as the target amount. And a plunger 350. The core 330 and the plunger 350 can improve the strength of the plunger 350 by improving the transmission of magnetic force to the plunger 350 and reduce the number of components. Structure.

The coil assembly 310 includes a bobbin 311 and a coil 312 wound around the bobbin 311.

The core 330 is installed on the upper side of the bobbin 311 so that the outer circumferential surface of the portion where the core 330 is inserted into the bobbin 311 is in contact with the inner circumferential surface of the bobbin 311.

The plunger 350 is inserted into the lower side of the bobbin 311 and when the current flows through the coil assembly 310, the outer circumferential surface of the plunger 350 rides on the inner circumferential surface of the bobbin 311 toward the core 330 When the current flowing through the coil assembly 310 is interrupted, the outer peripheral surface of the coil assembly 310 is lowered along the inner peripheral surface of the bobbin 311 by the elastic force.

In addition, the nozzle housing 500 includes a body 510 and a nozzle 530 for spraying supplied gaseous fuel. The solenoid valve 300 has the following structure to improve the transmission of magnetic force to the plunger 350 in association with the structure of the solenoid valve 300.

The body 510 is formed in a tubular shape so that the plunger 350 and the nozzle 530 can be installed therein and at least one fuel supply hole 511 is formed to flow the gaseous fuel to the nozzle 530 . The inner diameter of the body 510 is made to coincide with the inner diameter of the bobbin 311 so that the outer circumferential surface of the plunger 350 can be lifted and ridden on the inner circumferential surface of the body 510.

The nozzle 530 is inserted into the lower part of the body 510 and the fuel injection pipe 531 is formed at the center of the inside along the longitudinal direction so that the flow rate can be controlled by changing the diameter, The fuel supply hole 511 and the fuel injection pipe 531 are communicated with each other to enable the injection of the gaseous fuel and the fuel supply hole 511 and the fuel injection pipe 531 are blocked and the supply of the gaseous fuel can be stopped.

The structure of the solenoid valve 300 and the nozzle housing 500 as described above improves the lifting force of the plunger 350 compared with the prior art in which the guide is provided between the bobbin 311 and the body 510, It is possible to reduce the number of parts of the injector and to reduce the coupling part to reduce the tolerance and to prevent the solenoid valve 300 and the nozzle housing 500 from being damaged, It is possible to reduce the number of the plungers to be smaller than that of the prior art, and to achieve a weight reduction effect.

Next, in order to prevent the vacuum phenomenon between the plunger 350 and the core 330 from occurring, the plunger 350 has a circulation structure as follows.

The plunger 350 is divided into an upper body 351 and a lower body 354.

The upper body 351 has an outer circumferential surface elevated by the bobbin 311 and an inner circumferential surface of the body 510. The upper body 351 is connected to the upper body 351 at a central portion thereof A first circulation conduit 352 is formed. A spring (not shown) is provided on the upper side of the first circulation conduit 352 to provide an elastic force to lower the plunger 350. The first circulation duct 352 has a configuration in which a step is formed by giving a change in the diameter of the upper part and the lower part of the first side along one side in the longitudinal direction and the spring is supported on the step formed, To allow the spring to be installed.

The lower body 354 is formed at a lower portion of the upper body 351 and has an outer diameter relatively smaller than an outer diameter of the upper body 351. And a second circulation conduit 355 for communicating the first circulation conduit 352 with the outer circumferential side is formed.

Due to the structure of the plunger 350, the space formed by the difference in outer diameter between the upper body 351 and the lower body 354 is communicated with the first circulation duct 352 and the second circulation duct 355, The plunger 350 can circulate the gaseous fuel flowing between the plunger 350 and the core 330 to prevent the generation of vacuum due to the lifting and lowering of the plunger 350. [ Therefore, it is possible to prevent the malfunction of the injector according to the present invention.

Here, the plunger 350 may be provided with an upper sheet 353 and a lower sheet 356 to mitigate the impact caused by the ascent and descent of the plunger 350, and improve airtightness when the nozzle 530 is shut off.

The upper sheet 353 is installed on the upper surface of the upper body 351 to alleviate the shock to the core 330 due to the rise of the plunger 350.

The lower seat 356 is installed on the lower surface of the lower body 354 and the lower surface of the lower body 354 is provided with an installation groove (not shown) through which the upper side of the lower seat 356 is inserted . A protruded ring portion (not shown) is formed on the lower surface of the lower sheet 356 so as to be convex along the circumference of the lower sheet 356 to improve airtightness with the nozzle 530 when the plunger 350 is lowered .

Lastly, the present invention forms a pneumatic bearing using gaseous fuel in the bobbin 311 and the body 510 to prevent mechanical friction with the inner circumferential surface of the bobbin 311 and the body 510 when the plunger 350 is lifted or lowered (Not shown) so as to be able to rotate the bearing.

In detail, the bearing means comprises a pocket and a pneumatic supply conduit.

The pockets are formed in the bobbin 311 and the body 510, respectively, along the inner circumference of the bobbin 311 and the body 510. The pockets are recessed at a predetermined depth on the inner circumferential surface to provide a space in which the pneumatic bearings are formed.

The pneumatic supply pipe is formed to communicate with each of the pockets and the pipe for supplying the gaseous fuel to the fuel supply hole. The pneumatic supply pipe is formed so as to communicate with the body 510 and the bobbin 311 so as to communicate the pockets for supplying the gaseous fuel with the fuel supply holes to each of the pockets or to divide the minute hoses into multiple directions, The body 510 and the bobbin 311 are allowed to communicate with each other through the pockets and the fuel supply holes to supply the gaseous fuel.

In addition, an orifice is provided at each of the pocket-side ends of the pneumatic supply pipe to allow the gaseous fuel supplied to the pockets to be ejected, and a check valve is provided at one side of the pneumatic pipe to allow the gaseous fuel to flow only to the pocket side Let's do it.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Anyone with ordinary knowledge of the present invention will be able to readily appreciate it.

100: Terminal
300: Solenoid valve
310: Coil assembly
311: Bobbin
312: Coil
330: Core
350: plunger
351: upper body
352: first circulation duct
353: Upper seat
354: Lower body
355: second circulation duct
356:
500: nozzle housing
510: Body
511: fuel supply hole
530: Nozzle
531: Fuel injection pipe

Claims

1. An injector comprising: a solenoid valve; and a nozzle housing disposed below the solenoid valve and adapted to inject gaseous fuel according to operation of the solenoid valve,
The solenoid valve includes:
A coil assembly including a bobbin and a coil wound around the bobbin,
A core inserted into the upper side of the bobbin so that an outer circumferential surface of the inserted portion is in contact with an inner circumferential surface of the bobbin,
The outer circumferential surface of the bobbin rises to the core side on the inner circumferential surface of the bobbin when the current flows through the coil assembly and the outer circumferential surface of the plunger moves downward along the inner circumferential surface of the bobbin due to the elastic force, , &Lt; / RTI >
The nozzle housing includes:
A body which is formed with at least one fuel supply hole and whose inner diameter is coincident with the inner diameter of the bobbin so that the outer circumferential surface of the plunger is lifted and ridden on the inner circumferential surface,
And a nozzle inserted into a lower portion of the body to communicate with the fuel supply hole in accordance with the rising of the plunger to enable injection of gaseous fuel and shut off the fuel supply hole according to the descent of the plunger,
The plunger,
A first circulation conduit for communicating an upper portion and a lower portion along a longitudinal direction is formed at a central portion of the bobbin and an inner circumferential surface of the body and an elastic force for lowering the plunger is provided on an upper side of the first circulation conduit, An upper body in which a spring is installed,
And a lower body formed at a lower portion of the upper body and having an outer diameter relatively smaller than an outer diameter of the upper body and having a second circulation conduit communicating the first circulation conduit with the outside,
The space formed by the difference in outer diameter between the upper body and the lower body and the first circulation duct and the second circulation duct are communicated with each other to circulate the gaseous fuel flowing between the plunger and the core to prevent the generation of vacuum due to the lifting and lowering of the plunger There,
An upper sheet is provided on the upper surface of the upper body to mitigate the impact with the core due to the rise of the plunger,
And a lower portion of the lower body is provided with a mounting groove portion for mounting a lower seat to mitigate airtightness and impact with the nozzle due to the lowering of the plunger,
The lower surface of the lower sheet is formed with a protruding ring convexly formed around the periphery thereof to improve airtightness performance,
In the bobbin and the body,
A plurality of pockets formed along the inner circumference of each of the bobbin and the body, the pockets being recessed at a predetermined depth on the inner circumferential surface to provide a space in which the pneumatic bearings are formed by the gaseous fuel,
And a pneumatic supply pipe for communicating each of the pockets with a conduit for supplying gaseous fuel to the fuel supply hole,
And an orifice is provided at each pocket-side end portion of the pneumatic supply pipe so as to allow the gaseous fuel supplied to the pockets to be ejected, and a check valve is provided at one side of the pneumatic supply pipe to allow the gaseous fuel to flow only to the pocket side Features an injector.

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