CN109760825A - A kind of steerable electrohydraulic servo valve - Google Patents
A kind of steerable electrohydraulic servo valve Download PDFInfo
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- CN109760825A CN109760825A CN201910088966.8A CN201910088966A CN109760825A CN 109760825 A CN109760825 A CN 109760825A CN 201910088966 A CN201910088966 A CN 201910088966A CN 109760825 A CN109760825 A CN 109760825A
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Abstract
A kind of steerable electrohydraulic servo valve, torque-motor are installed on shell, and prestage and slide valve grade are assemblied in shell, and make to pass through hydraulic connecting between the prestage and slide valve grade.Piston manipulation chamber is provided on the shell of slide valve grade assembly vestibule one end, which manipulates chamber and the intracorporal spool valve core cavity of shell penetrates through.It is intracavitary that spring is placed in piston manipulation.The intracavitary oil circuit for being provided with and being connected to the return port is manipulated in the piston.It is intracavitary that one end of piston is placed in piston manipulation, and makes to be slidably matched therebetween.The present invention is driven by hydraulic piston and is manipulated, to export required water brake pressure, and using the manipulation device of setting as external steerable means, to manipulate the required brake pressure of the slide valve output of slide valve grade when needing, use to aircraft brake-by-wire electrohydraulic servo valve, aircraft brake-by-wire system promotes and applies and the reliable and secure operation of aircraft brake-by-wire system has important practical significance.
Description
Technical field
The present invention relates to aircraft electro-hydraulic servo control technology, specifically a kind of manipulating for aircraft brake-by-wire system
The electrohydraulic servo valve of brake.
Background technique
Electrohydraulic servo valve is aircraft brake-by-wire system main accessories, undertakes the dual of water brake valve and anti-sliding control valve
Function.This electrohydraulic servo valve is usually secondary pressure postiive gain type, and construction includes torque-motor, prestage, slide valve grade.Before
It sets grade and commonly uses spray block valve, also useful jet action valve.Pressure output characteristic, that is, brake pressure of postiive gain type electrohydraulic servo valve and control
Electric current linear proportional relationship processed.The size of current of electrohydraulic servo valve torque-motor coil is inputed to by controlling, so that it may control
The hydraulic pressure that the output of electrohydraulic servo valve slide valve grade needs leads to brake machine wheel and brakes.From composition and principle it is found that electro-hydraulic
The output of servo valve is controlled by electric signal (electric current) manipulate completely.Electrohydraulic servo valve is in the case where the manipulation of no electric signal
It cannot start and run at all.At hydraulic aspect, if prestage failure, such as spray block valve or jet action valve failure, will lead to
Slide valve grade is not normally functioning, and electrohydraulic servo valve is unable to normal use in the same old way.Therefore, existing the electro-hydraulic of aircraft brake-by-wire is watched
Taking deficiency existing for valve is left under electrical control or electrichydraulic control failure conditions again without other external steerable means.This
Aircraft brake-by-wire application is brought a negative impact.In practice, brake instruction transducer failure or antiskid braking control box failure
Without output, it can all cause driver when braking due to there is no control current signal electrohydraulic servo valve that cannot export brake pressure in time
The event for carrying out wheel braking occurs.Hydraulic prestage failure also happens occasionally, and causes electrohydraulic servo valve failure to cause aircraft and rises
Fly to alighting run brake accident proneness.The steerable means that therefore, it is necessary to a kind of in addition to electrical control fail in electrichydraulic control
In the case of can manipulate electrohydraulic servo valve brake.In addition, in terms of take-off line brake, existing electrohydraulic servo valve reliability applicability
Difference, accidental brake pressure are not achieved maximum value, or occur instantaneously falling to press phenomenon, can also grasp without selectable non-automatically controlled other
Vertical means, to ensure the required brake pressure of the permanent steady output of electrohydraulic servo valve.In short, existing aircraft brake-by-wire is electro-hydraulic
Servo valve Shortcomings be fail in electrichydraulic control, or export brake pressure be not able to satisfy use and when requiring manual intervention,
Lack non-other automatically controlled steerable means, to export required brake pressure with manipulating its slide valve grade normal reliable, this
A intrinsic insufficient run reliable and secure to the application of aircraft brake-by-wire system and aircraft brake-by-wire system has very important shadow
It rings, it is therefore desirable to improve, a kind of steerable means in addition to electrical control are provided.
A kind of Plane Brake Control Valves are proposed in the innovation and creation application No. is 201310075475.2, are related to one kind
The improved electro-hydraulic pressure pilot valve for aircraft brake-by-wire system is manufactured by modularized design, can provide inlet-pressure
Power and outlet pressure signal have the characteristics that preferable job stability and reliability.There is also in addition to electrical control for this application
The deficiency of means can be manipulated without outside.
Summary of the invention
Electrical control is left again that means can not manipulated outside other to overcome the shortcomings of to exist in the prior art, the present invention
Propose a kind of steerable electrohydraulic servo valve.
The present invention includes: shell, torque-motor, prestage and slide valve grade.The torque-motor is installed on shell.Before
It sets grade and slide valve grade is assemblied in shell, and make to pass through hydraulic connecting between the prestage and slide valve grade.It is characterized in that,
It is provided with through-hole on the shell of slide valve grade assembly vestibule one end, which is that piston manipulates chamber.Piston behaviour
Vertical chamber and the intracorporal spool valve core cavity of shell penetrate through.The piston manipulation chamber is located at the housing wall of the oil return opening side of spool valve core cavity
On.The aperture that the piston manipulates intracavitary end is identical as the outer diameter of described valve core of the spool valve one end, and makes clearance fit between the two.
The aperture that the piston manipulates chamber outer end is slightly larger than the outer diameter of return spring, for placing the spring, and is located at the return spring
Between piston and piston manipulation chamber bottom of chamber.The intracavitary oil circuit for being provided with and being connected to the return port is manipulated in the piston.One end of piston
It is intracavitary to be placed in piston manipulation, and makes to be slidably matched therebetween.
The piston rod of the piston is adjacent to slide valve grade valve core of the spool valve valve rod end, in initial position, the end face of piston rod with
Slide valve grade valve core of the spool valve valve rod has the gap 1.5~3.5mm between end.Piston manipulation chamber is isolated into two chambers by piston: its
In, the chamber of piston rod one end is connected to the return port, and the chamber of piston head end is connected to the hydraulic control mouth on shell.Piston is by coming
From the hydraulic operation of hydraulic control mouth, so that slide valve grade valve core of the spool valve be pushed to be displaced, slide valve grade output hydraulic pressure pressure is manipulated.
The manipulation chamber is stepped hole, and center line is overlapped with slide valve grade assembly vestibule center line, and the bottom of the steps centre bore prolongs
It stretches and the assembly vestibule perforation of slide valve grade；Valve core of the spool valve the first convex shoulder valve rod of slide valve grade is in the position towards manipulation chamber, the end
Space where spool end is connected to the return port by oil circuit in shell so that the end valve core it is end-acted recycle muzzle pressure.
Pressure supply mouth, brake mouth, oil return opening and hydraulic control mouth have been distributed on the shell.The pressure supply mouth, brake mouth and return
Hydraulic fluid port is connected with relevant aeroplane brake system fluid pressure line respectively.Specifically, the pressure supply mouth and airplane brake system pressure source
Pipeline connection, brake mouth couple with aircraft braking wheel brake gear pipeline, and oil return opening couples with aircraft oil return line.The liquid
Control mouth passes brake system with aircraft liquid and is connected to.
It is mechanically connected between the torque-motor and prestage, hydraulic connecting between prestage and slide valve grade.Prestage with
Pressure supply mouth is provided with hydraulic filter and fixed orifice by the oil communication in shell, and on the oil circuit for leading to prestage.
The first control large end face of valve core of the spool valve and the second control large end face pass through oil circuit and preposition cascade in shell in slide valve grade
It is logical；One end of valve core of the spool valve be connected to brake mouth, and is equipped with spring in the end large end face or small end face, the valve core of the spool valve other end and
Oil return opening connection.
The external peripheral surface of the valve core of the spool valve has the convex shoulder of radially protruding at two, is the first convex shoulder and the second convex shoulder respectively.
First convex shoulder is for controlling oil return opening；The ring that the outer end end face of first convex shoulder, i.e. convex shoulder outer diameter and valve rod outer diameter limit
Shape band is the first control large end face, and the control pressure come from prestage acts on the first control large end face；It is described
The valve core of the spool valve end face of first convex shoulder one end is valve core of the spool valve small end face；It is small that pressure from oil return opening acts on the valve core of the spool valve
On end face.Second convex shoulder controls pressure supply mouth；The ring that the outer end end face of second convex shoulder, i.e. convex shoulder outer diameter and valve rod outer diameter limit
Shape band is the second control large end face, another control pressure come from prestage acts on the second control large end face.Institute
The valve core of the spool valve end face for stating second convex shoulder one end is also valve core of the spool valve small end face；Pressure from brake mouth acts on the spool valve
On core small end face.
The electrohydraulic servo valve of electrichydraulic control when being not powered on, close by pressure supply mouth, and oil return opening is opened, and brake mouth and oil return opening connect
Logical, slide valve grade does not have hydraulic output；After energization, torque-motor manipulates prestage and generates pressure change, and valve core of the spool valve is in prestage
Pressure difference effect is lower to generate displacement, and the first convex shoulder of slide valve grade valve core of the spool valve is made to close oil return opening first, and further displacement makes
Second convex shoulder of slide valve grade valve core of the spool valve opens the oil inlet of pressure supply mouth, be connected to pressure supply mouth with brake mouth, output and control electric current at
The hydraulic pressure of ratio.
When the hydraulic control mouth of piston manipulation chamber receives hydraulic pressure, under action of hydraulic force, push piston to cunning
Valve grade valve core of the spool valve is mobile, to push slide valve grade valve core of the spool valve mobile, the first convex shoulder of slide valve grade valve core of the spool valve closes oil return
Mouthful；Second convex shoulder of further displacement, slide valve grade valve core of the spool valve opens the oil inlet of pressure supply mouth, is connected to pressure supply mouth with brake mouth, by
Hydraulic pressure needed for brake mouth output brakes, and pressure supply mouth open degree is bigger, and the brake pressure of output is bigger.
When the hydraulic pressure that the hydraulic control mouth of piston manipulation chamber does not receive, under return spring effect, piston is returned
To initial position, axial thrust is released on the slide valve grade valve core of the spool valve of the one end being manipulated, and the slide valve grade valve core of the spool valve other end exists
Initial position is returned to therewith under the effect of hydraulic and spring, closes pressure supply mouth, and oil return opening is opened, and brake mouth is kept with oil return opening again
Connection.
Piston seal is embedded in the external peripheral surface of the piston head of the piston.The stomidium outside piston manipulation chamber
Blanking cover is laid in mouthful, is provided with hydraulic control mouth on the piston manipulation lumen pore wall between the blanking cover and the piston head outer end face, the liquid
Control mouth couples with airplane hydraulic pressure control piper.
The present invention is driven by hydraulic piston and is manipulated, to export required water brake pressure.The present invention is in electro-hydraulic servo
Manipulation device is arranged in one end of valve slide valve grade slide valve, and as external steerable means, the slide valve of slide valve grade is manipulated when needing
Brake pressure needed for output.
Manipulation device is arranged in electrohydraulic servo valve slide valve grade in the present invention, is manipulated by hydraulic piston as external steerable
Means, brake pressure needed for manipulating the output of slide valve grade when needing.Manipulation device includes hydraulic piston.Under normal circumstances,
The hydraulic pressure output of electrohydraulic servo valve is controlled by electric signal, i.e., preposition by the control electric current manipulation of input torque motor coil
Grade, then the water brake pressure directly proportional to control size of current by the output of prestage spool control valve grade.It is controlled in electric signal
It loses or prestage failure leads to not manipulate slide valve grade output hydraulic pressure pressure or electrichydraulic control manipulates the output of slide valve grade not
When being able to satisfy maximum brake pressure requirement needed for stablizing output, such as take-off line brake aircraft sliding, maximum brake pressure is not
It is enough, as long as pilot control brake sensor controls pressure to hydraulic control mouth input hydraulic pressure, piston manipulation slide valve grade is pushed to export institute
The brake pressure needed.It is this only to be grasped by the outside that control box internal electric manipulates relative to aircraft brake-by-wire electrohydraulic servo valve
Vertical means control independently of electric signal, have expanded the maneuverability pattern of aircraft brake-by-wire electrohydraulic servo valve, as needed may be used
Artificial manipulation slide valve grade output, has fail-safe function, improves the service performance of electrohydraulic servo valve, enhance aircraft fax
The viability of brake system, it is ensured that the reliable and secure operation of aircraft brake-by-wire system.
Structure of the invention is reasonable, simple and practical, preferably solves the presence of prior art electrohydraulic servo valve and leaves electrical control
Again without the deficiency of other external steerable means, use to aircraft brake-by-wire electrohydraulic servo valve, aircraft brake-by-wire
System promotes and applies and the reliable and secure operation of aircraft brake-by-wire system has important practical significance.
Detailed description of the invention
Fig. 1 is a kind of steerable electrohydraulic servo valve structure principle chart of the invention.
In figure:
1. shell；2. torque-motor；3. prestage；4. slide valve grade；5. pressure supply mouth；6. brake mouth；7. oil return opening；8. oil
Filter；9. fixed orifice；10. hydraulic control mouth；11. piston manipulates chamber；12. piston；13. return spring；14. piston seal.
Specific embodiment
The present embodiment is that one kind can manipulate electrohydraulic servo valve, comprising: shell 1, torque-motor 2, prestage 3 and slide valve grade 4.
The torque-motor 2 uses the prior art, is installed on shell 1.Prestage 3 and slide valve grade 4 are assemblied in shell 1, and
Make to pass through hydraulic connecting between the prestage 3 and slide valve grade.The prestage 3 and slide valve grade 4 is the prior art.
There are three hydraulic interfaces on the shell 1, are pressure supply mouth 5, brake mouth 6 and oil return opening 7 respectively.Described three hydraulic
Interface is connected with relevant aeroplane brake system fluid pressure line respectively.Specifically, the pressure supply mouth and airplane brake system pressure source
Pipeline connection, brake mouth couple with aircraft braking wheel brake gear pipeline, and oil return opening couples with aircraft oil return line.
It is mechanically connected between torque-motor 2 and prestage 3, hydraulic connecting between prestage 3 and slide valve grade 4.Prestage 3 with
Pressure supply mouth is provided with hydraulic filter 8 and fixed restriction by the oil communication in shell 1, and on the oil circuit for leading to prestage 3
Hole 9.Two large end faces of valve core of the spool valve are connected to by the oil circuit in shell 1 with prestage 3 in slide valve grade 4；The one of valve core of the spool valve
End is connected to brake mouth, and is equipped with spring in the end large end face or small end face, and the valve core of the spool valve other end is connected to the return port.
It is provided with through-hole in one side surface of shell, which is that piston manipulates chamber 11.The piston manipulates in chamber and shell
Spool valve core cavity perforation, and make the piston manipulation chamber center line and the intracorporal spool valve core cavity of the shell center line it is coaxial.
The piston manipulation chamber 11 is located on the housing wall of 7 side of oil return opening of spool valve core cavity.The piston manipulates the hole at intracavitary end
Diameter is identical as the outer diameter of described valve core of the spool valve one end, and makes clearance fit between the two.It omits in the aperture that the piston manipulates chamber outer end
Greater than the outer diameter of return spring 13, for placing the spring 13.The intracavitary oil for being provided with and being connected to oil return opening 7 is manipulated in the piston
Road.
One end of piston 12 is placed in piston manipulation chamber 11, and makes to be slidably matched therebetween.In the work of the piston
The external peripheral surface of chock plug is embedded with piston seal 14.Blanking cover is laid in piston manipulation 11 outer end aperture of chamber, it should
Hydraulic control mouth 10 is provided on piston manipulation lumen pore wall between blanking cover and the piston head outer end face.
The slide valve grade 4 uses the prior art, including valve core of the spool valve and valve pocket.The valve core of the spool valve both ends respectively with brake
Mouth is connected to oil return opening.For the connection for realizing the valve core of the spool valve and brake mouth and oil return opening, in the outer circle of the valve core of the spool valve
Perimeter surface has the convex shoulder of radially protruding at two, is the first convex shoulder and the second convex shoulder respectively.First convex shoulder is for controlling oil return
Mouthful；The endless belt that the outer end end face of first convex shoulder, i.e. convex shoulder outer diameter and valve rod outer diameter limit comes from as the first control large end face
The control pressure that prestage is come acts on the first control large end face；The valve core of the spool valve end face of first convex shoulder one end
For valve core of the spool valve small end face；Pressure from oil return opening acts on the valve core of the spool valve small end face.The second convex shoulder control supplies
Press mouth；The endless belt that the outer end end face of second convex shoulder, i.e. convex shoulder outer diameter and valve rod outer diameter limit comes from as the second control large end face
Another control pressure that prestage is come acts on the second control large end face.The valve core of the spool valve end of second convex shoulder one end
Face is also valve core of the spool valve small end face；Pressure from brake mouth acts on the valve core of the spool valve small end face.
The torque-motor 2, prestage 3 and slide valve grade 4 and oily filter 8 and fixed orifice 9 are all made of the prior art.
Spring is set in spool one end by existing way.
The present embodiment prestage 3 is twin flapper-and-nozzle valve；Torque-motor 2 and the baffle of twin flapper-and-nozzle valve are controllably mechanical
Connection；Pressure supply mouth pressure oil divides through oily filter 8 and fixed orifice 9 for two-way, enters nozzle all the way, and another way enters slide valve grade 4
Chamber where two large end faces of valve core of the spool valve, chamber where 4 valve core of the spool valve large end face of Nozzle flapper valve nozzle cavity pressure and slide valve grade
Room connection；Spring is equipped in the spool one end small end face being connected to brake mouth；Spool one end passes through oil circuit and brake in spool
Mouth connection；The spool other end is connected to the return port by oil circuit in shell.
The prior art is pressed in the operation of the electrohydraulic servo valve of electrichydraulic control.When being not powered on, pressure supply mouth is closed, and oil return opening is opened
It opens, brake mouth is connected to the return port, and slide valve grade 4 is without hydraulic output；After energization, torque-motor 2 manipulates prestage 3 and generates pressure
Variation, 4 valve core of the spool valve of slide valve grade, two large end face act on bottom offset in 3 pressure difference of prestage, and 4 valve core of the spool valve one of slide valve grade first is convex
I.e. the first convex shoulder of shoulder closes oil return opening, is further displaced, and i.e. the second convex shoulder of another convex shoulder of 4 valve core of the spool valve of slide valve grade opens pressure supply mouth
Oil inlet is connected to pressure supply mouth with brake mouth, exports the hydraulic pressure proportional to control electric current.
Piston manipulation chamber 11 is provided on the shell 1 that slide valve grade 4 assembles vestibule one end；The manipulation chamber is stepped hole,
Center line is overlapped with slide valve grade assembly vestibule center line, and the bottom of the steps centre bore extends and the assembly vestibule perforation of slide valve grade；Slide valve
4 valve core of the spool valve the first convex shoulder valve rods of grade are in the position towards manipulation chamber 11, and space where the end spool end passes through in shell
Oil circuit is connected to the return port so that the end valve core it is end-acted recycle muzzle pressure；
The piston 12 of rod failure is assemblied in piston manipulation chamber 11, piston seal 14 is equipped between piston and shell, in piston
Return spring 13 is housed between 12 and the bottom of chamber.The piston rod head of piston 12 is adjacent to 4 valve core of the spool valve valve rod end of slide valve grade, first
Beginning position keeps appropriate gap between piston rod end and slide valve grade valve core of the spool valve valve rod end, which is 1.5~3.5mm.
Piston manipulation chamber is isolated into two chambers by piston 12, in the chamber and oil return opening of the piston rod side installation return spring 13 of piston 12
7 connections；Chamber in piston end side is connected to hydraulic control mouth 10.Piston 12 can by hydraulic control mouth 10 come hydraulic operation, to push away
The displacement of 4 valve core of the spool valve of movable pulley grade, manipulates 4 output hydraulic pressure pressure of slide valve grade.
Hydraulic control mouth 10 couples with airplane hydraulic pressure control piper, specifically passes brake system with liquid and couples, the present embodiment uses
It is connect with the brake sensor of pilot control, brake sensor uses the prior art.
When pilot control brake sensor, brake sensor output hydraulic pressure pressure enters hydraulic control mouth 10, in liquid by the road
Under pressure effect, it is mobile to 4 valve core of the spool valve of slide valve grade to push piston 12, thus push 4 valve core of the spool valve of slide valve grade mobile, slide valve grade
4 valve core of the spool valve, one convex shoulder closes oil return opening, is further displaced, and another convex shoulder of 4 valve core of the spool valve of slide valve grade opens the oil inlet of pressure supply mouth, makes
Pressure supply mouth is connected to brake mouth, and the hydraulic pressure needed for the output of brake mouth brakes, and pressure supply mouth open degree is bigger, output
Brake pressure is bigger.
Driver's releasing of brake sensor manipulation, the hydraulic pressure of brake sensor release output, makees in return spring 13
Under, piston 12 returns to initial position, and axial thrust releases on 4 valve core of the spool valve of slide valve grade of the one end being manipulated, and slide valve grade 4 is sliding
The valve core other end returns to initial position under the effect of hydraulic and spring therewith, closes pressure supply mouth, and oil return opening is opened, and brake mouth
It is connected to again with oil return opening holding.
Claims (8)
1. a kind of steerable electrohydraulic servo valve, comprising: shell, torque-motor, prestage and slide valve grade；The torque-motor quilt
It is mounted on shell；Prestage and slide valve grade are assemblied in shell, and are made between the prestage and slide valve grade by hydraulic
Connection；It is characterized in that,
It is provided with through-hole on the shell of slide valve grade assembly vestibule one end, which is that piston manipulates chamber；The piston manipulates chamber
It is penetrated through with the intracorporal spool valve core cavity of shell；On the housing wall for the oil return opening side that the piston manipulation chamber is located at spool valve core cavity；
The aperture that the piston manipulates intracavitary end is identical as the outer diameter of described valve core of the spool valve one end, and makes clearance fit between the two；It should
The aperture that piston manipulates chamber outer end is slightly larger than the outer diameter of return spring, for placing the spring, and is located at the return spring and lives
Between plug and piston manipulation chamber bottom of chamber；The intracavitary oil circuit for being provided with and being connected to the return port is manipulated in the piston；Pacify one end of piston
It is intracavitary to be placed on piston manipulation, and makes to be slidably matched therebetween；
The piston rod of the piston is adjacent to slide valve grade valve core of the spool valve valve rod end, in initial position, the end face of piston rod and slide valve
There is the gap of 1.5~3.5mm between grade valve core of the spool valve valve rod end；Piston manipulation chamber is isolated into two chambers by piston: where
The chamber of piston rod one end is connected to the return port, and the chamber of piston head end is connected to the hydraulic control mouth on shell；Piston is by coming from
The hydraulic operation of hydraulic control mouth manipulates slide valve grade output hydraulic pressure pressure so that slide valve grade valve core of the spool valve be pushed to be displaced.
2. a kind of steerable electrohydraulic servo valve as described in claim 1, which is characterized in that the manipulation chamber is stepped hole, in
Heart line is overlapped with slide valve grade assembly vestibule center line, and the bottom of the steps centre bore extends and the assembly vestibule perforation of slide valve grade；Slide valve grade
Valve core of the spool valve the first convex shoulder valve rod be in the position towards manipulation chamber, space passes through oil circuit in shell where the spool end of the end
Be connected to the return port so that the end valve core it is end-acted recycle muzzle pressure.
3. a kind of steerable electrohydraulic servo valve as described in claim 1, which is characterized in that be distributed pressure supply on the shell
Mouth, brake mouth, oil return opening and hydraulic control mouth；The pressure supply mouth, brake mouth and oil return opening are hydraulic with relevant aeroplane brake system respectively
Pipeline is connected；Specifically, the pressure supply mouth couples with airplane brake system pressure source pipeline, and brake mouth and aircraft braking wheel are stopped
The connection of vehicle device pipeline, oil return opening couple with aircraft oil return line；The hydraulic control mouth passes brake system with aircraft liquid and is connected to.
4. a kind of steerable electrohydraulic servo valve as described in claim 1, which is characterized in that the torque-motor and prestage it
Room machine connection, hydraulic connecting between prestage and slide valve grade；Prestage and pressure supply mouth by the oil communication in shell, and
Hydraulic filter and fixed orifice are provided on towards the oil circuit of prestage；First control large end face of valve core of the spool valve in slide valve grade
Pass through the oil circuit in shell with the second control large end face to be connected to prestage；One end of valve core of the spool valve is connected to brake mouth, and
It is equipped with spring in the end large end face or small end face, the valve core of the spool valve other end is connected to the return port.
5. a kind of steerable electrohydraulic servo valve as described in claim 1, which is characterized in that the external peripheral surface of the valve core of the spool valve
There is the convex shoulder of radially protruding at two, is the first convex shoulder and the second convex shoulder respectively；First convex shoulder is for controlling oil return opening；This
The endless belt that the outer end end face of one convex shoulder, i.e. convex shoulder outer diameter and valve rod outer diameter limit comes from prestage as the first control large end face
The control pressure come acts on the first control large end face；The valve core of the spool valve end face of first convex shoulder one end is slide valve
Spool small end face；Pressure from oil return opening acts on the valve core of the spool valve small end face；Second convex shoulder controls pressure supply mouth；The
The endless belt that the outer end end face of two convex shoulders, i.e. convex shoulder outer diameter and valve rod outer diameter limit comes from prestage as the second control large end face
Another control pressure come acts on the second control large end face；The valve core of the spool valve end face of second convex shoulder one end is also
Valve core of the spool valve small end face；Pressure from brake mouth acts on the valve core of the spool valve small end face.
6. a kind of steerable electrohydraulic servo valve as described in claim 1, which is characterized in that the electrohydraulic servo valve of electrichydraulic control exists
When being not powered on, pressure supply mouth is closed, and oil return opening is opened, and brake mouth is connected to the return port, and slide valve grade does not have hydraulic output；After energization,
Torque-motor manipulates prestage and generates pressure change, and valve core of the spool valve generates displacement under the effect of prestage pressure difference, makes to slide first
First convex shoulder of valve grade valve core of the spool valve closes oil return opening, and further displacement makes the second convex shoulder of slide valve grade valve core of the spool valve open confession
Mouth oil inlet is pressed, pressure supply mouth is connected to brake mouth, exports the hydraulic pressure proportional to control electric current.
7. a kind of steerable electrohydraulic servo valve as described in claim 1, it is characterised in that:
When the hydraulic control mouth of piston manipulation chamber receives hydraulic pressure, under action of hydraulic force, push piston to slide valve grade
Valve core of the spool valve is mobile, to push slide valve grade valve core of the spool valve mobile, the first convex shoulder of slide valve grade valve core of the spool valve closes oil return opening；Into
Second convex shoulder of one step displacement, slide valve grade valve core of the spool valve opens the oil inlet of pressure supply mouth, is connected to pressure supply mouth with brake mouth, by brake mouth
Hydraulic pressure needed for output brakes, and pressure supply mouth open degree is bigger, and the brake pressure of output is bigger；
When the hydraulic pressure that the hydraulic control mouth of piston manipulation chamber does not receive, under return spring effect, piston is returned to just
Beginning position, axial thrust releases on the slide valve grade valve core of the spool valve of the one end being manipulated, and the slide valve grade valve core of the spool valve other end is hydraulic
Initial position is returned to therewith under spring effect, closes pressure supply mouth, and oil return opening is opened, and brake mouth keeps connecting with oil return opening again
It is logical.
8. a kind of steerable electrohydraulic servo valve as described in claim 1, which is characterized in that the piston piston head it is outer
Circumferential surface is embedded with piston seal；Blanking cover is laid in piston manipulation chamber outer end aperture, the blanking cover and the work
It is provided with hydraulic control mouth on piston manipulation lumen pore wall between chock plug outer end face, which couples with airplane hydraulic pressure control piper.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910088966.8A CN109760825A (en) | 2019-01-30 | 2019-01-30 | A kind of steerable electrohydraulic servo valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910088966.8A CN109760825A (en) | 2019-01-30 | 2019-01-30 | A kind of steerable electrohydraulic servo valve |
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| CN109760825A true CN109760825A (en) | 2019-05-17 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110822129A (en) * | 2019-10-29 | 2020-02-21 | 中国航空工业集团公司西安飞行自动控制研究所 | Pressure feedback type slide valve structure |
| CN110836206A (en) * | 2019-10-29 | 2020-02-25 | 中国航空工业集团公司西安飞行自动控制研究所 | Pre-stage installation and adjustment locking device for jet pipe servo valve |
| CN111102261A (en) * | 2019-12-24 | 2020-05-05 | 中航工业南京伺服控制系统有限公司 | Force feedback positive gain type electro-hydraulic pressure servo valve |
| CN112682376A (en) * | 2020-11-26 | 2021-04-20 | 河南航天液压气动技术有限公司 | Novel large-flow electro-hydraulic servo valve |
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| CN1434219A (en) * | 2003-02-21 | 2003-08-06 | 华中科技大学 | Three-position three-way hydraulic change valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110822129A (en) * | 2019-10-29 | 2020-02-21 | 中国航空工业集团公司西安飞行自动控制研究所 | Pressure feedback type slide valve structure |
| CN110836206A (en) * | 2019-10-29 | 2020-02-25 | 中国航空工业集团公司西安飞行自动控制研究所 | Pre-stage installation and adjustment locking device for jet pipe servo valve |
| CN110836206B (en) * | 2019-10-29 | 2021-10-15 | 中国航空工业集团公司西安飞行自动控制研究所 | Pre-stage installation and adjustment locking device for jet pipe servo valve |
| CN111102261A (en) * | 2019-12-24 | 2020-05-05 | 中航工业南京伺服控制系统有限公司 | Force feedback positive gain type electro-hydraulic pressure servo valve |
| CN112682376A (en) * | 2020-11-26 | 2021-04-20 | 河南航天液压气动技术有限公司 | Novel large-flow electro-hydraulic servo valve |
| CN112682376B (en) * | 2020-11-26 | 2023-03-14 | 河南航天液压气动技术有限公司 | Large-flow electro-hydraulic servo valve |
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