CN105909844B - Proportion expression proportional pressure-reducing valve - Google Patents
Proportion expression proportional pressure-reducing valve Download PDFInfo
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- CN105909844B CN105909844B CN201610388344.3A CN201610388344A CN105909844B CN 105909844 B CN105909844 B CN 105909844B CN 201610388344 A CN201610388344 A CN 201610388344A CN 105909844 B CN105909844 B CN 105909844B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/32—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting on a servo-mechanism or on a catch-releasing mechanism
Abstract
Proportion expression proportional pressure-reducing valve, belong to pressure-reducing valve technical field.Piezoelectric actuator is connected with pilot valve, pilot valve cooperatively forms pilot valve valve port with guide's valve seat, main valve epicoele is formed between pilot valve oil feeder and guide's valve seat, main valve plug damper is arranged in main valve plug, the epimere shoulder of main valve plug cooperatively forms oil extraction valve port with undercut groove side above valve body, the hypomere shoulder of main valve plug cooperatively forms oil-feed valve port with undercut groove side below valve body, the stage casing shoulder of main valve plug is corresponding with undercut groove in the middle part of valve body, form output water conservancy diversion, valve body is arranged in valve block, the oil inlet and oil discharge outlet of valve block are connected with oil-feed valve port and oil extraction valve port respectively, the load port of valve block is connected with setting the undercut groove in the middle part of valve body, zeroing spring is arranged on intracavitary under main valve.Instructed by the use of the throttle orifice partial pressure of pilot valve valve port and pilot valve oil feeder as main valve plug, utilize the spring broad voltage regulation range that returns to zero.The present invention can make the change proportional to input pressure of the output pressure of valve.
Description
Technical field
The present invention relates to a kind of electro-hydraulic proportional reducing valve.Belong to pressure-reducing valve technical field.
Background technology
Existing proportional pressure-reducing valve, for general adoption rate electromagnet as control element, output pressure is definite value, passes through tune
Proportion electro-magnet is saved to control output pressure size.In these valves, proportion electro-magnet generation one is proportional to control signal
Power act on valve element, output hydraulic pressure pressure acts on the other end of valve element, when electromagnetic force is with fluid pressure balance, ratio decompression
Valve reaches poised state.Therefore output pressure is proportional to electromagnetic force, therefore can control output hydraulic pressure pressure by electromagnetic force.
Because actuator response is fast, some investigators attempt to use control unit of the piezoelectric actuator as proportioning valve.
But piezoelectric actuator can only export the micro-displacement proportional to control voltage, the displacement can not be with acting on the liquid on valve element
Pressure ratio relatively controls output displacement, it is impossible to controls power output, no image of Buddha use ratio electromagnet is equally operated.Existing scheme
Spool displacement is controlled using piezoelectric actuator, changes valve port opening, forms proportional throttle valve, recycles pressure sensor measurement defeated
Go out pressure, the control to output pressure is realized by closed-loop control.
The content of the invention
It is an object of the invention to provide a kind of proportion expression proportional pressure-reducing valve of output pressure change proportional to input pressure.
For the present invention by the use of piezoelectric actuator as control element, it is without using pressure sensor closed loop, you can realizes ratio
Example Stress control.
So-called proportion expression refers to：Output pressure is controlled with charge oil pressure into certain ratio, the ratio, rather than defeated
The absolute value for going out pressure is directly controlled.
Above-mentioned purpose is realized, the present invention adopts the technical scheme that：
The proportion expression proportional pressure-reducing valve of the present invention, including piezoelectric actuator, pilot valve, main valve, valve block and mounting bracket；Institute
The pilot valve stated includes guide's valve seat, pilot valve and pilot valve oil feeder；The middle part of guide's valve seat is from top to bottom provided with together
Axle and the centre bore and bore communicated；Described main valve includes main valve plug, valve body, main valve plug damper and zeroing spring；
Described piezoelectric actuator is connected by the upper surface of mounting bracket and valve body, the lower surface of piezoelectric actuator and elder generation
The upper surface connection of guide valve core, described pilot valve is arranged in the centre bore of guide's valve seat, pilot valve top it is cylindrical
The inner peripheral surface of cylinder and the centre bore of guide's valve seat coordinates, and the lower end of pilot valve and the upper port of the bore of guide's valve seat are matched somebody with somebody
Conjunction forms pilot valve valve port, the top that the bottom of guide's valve seat is arranged in the central duct of valve body and the two be detachably connected,
The inside of guide's valve seat is provided with the runner one and runner two being connected, and described runner one communicates with the centre bore of guide's valve seat,
The inside of valve body is provided with the runner three communicated with described runner two；Described pilot valve oil feeder and main valve plug are from top to bottom set
Put in the central duct of valve body, and pilot valve oil feeder is arranged on the lower section of guide's valve seat, pilot valve oil feeder and pilot valve
Region between seat is main valve epicoele, and the cylindrical section of pilot valve oil feeder bottom is arranged on the top in the medium pore canal of main valve plug
And the two is detachably connected；Under the cylindrical section on the top of described main valve plug damper is arranged in the medium pore canal of main valve plug
Portion and the two be detachably connected；The outer wall of described main valve plug is provided with three sections of shoulders of upper, middle and lower, the epimere shoulder of main valve plug with
It is arranged at the undercut groove side above body wall on endoporus and cooperatively forms oil extraction valve port, the hypomere shoulder of main valve plug is with being arranged at valve
Undercut groove side below body sidewall on endoporus cooperatively forms oil-feed valve port, and the stage casing shoulder of main valve plug is with being arranged in body wall
Undercut groove on portion's endoporus is corresponding；The inside of described valve block is provided with center cavity, valve body be arranged in the center cavity of valve block and
The two is detachably connected；Oil inlet, load port and oil discharge outlet, described oil inlet and oil-feed are respectively equipped with the lateral wall of valve block
Valve port is connected, and described oil discharge outlet is connected with oil extraction valve port, and described load port is with being arranged at endoporus in the middle part of body wall
On undercut groove be connected；
When oil-feed valve port is in specified aperture, in the middle part of stage casing shoulder to the described body wall of main valve plug on endoporus
Undercut groove spacing is consistent with oil-feed valve port opening；When oil extraction valve port is in specified aperture, the stage casing shoulder of main valve plug is to described
Body wall in the middle part of undercut groove spacing on endoporus it is consistent with oil extraction valve port opening；It is heavy to be provided with the hypomere shoulder of main valve plug
Groove, described deep gouge are connected by the radial hole being arranged in main valve plug with the medium pore canal of main valve plug, and then are supplied with pilot valve
Oily device connection, deep gouge also communicate with being arranged at the undercut groove below body wall on endoporus；
The hypomere shoulder upper surface of main valve plug is symmetrically provided with two feedback inclined holes, described two feedback inclined holes and main valve plug
The throttling pore connection that damper lower surface is provided with；The center cavity of valve block is located at main valve plug damper lower zone under main valve
Chamber, described zeroing spring are arranged on intracavitary under main valve, and the upper end for the spring that returns to zero is connected with the lower surface of main valve plug damper, adjust
The lower end of zero spring is connected with main valve cavity of resorption bottom surface.
Beneficial effects of the present invention are：
1. carrying out partial pressure using piezoelectric actuator control pilot valve, measured without pressure sensor, make valve oil-out
Pressure relation proportional to inlet pressure.
2. using three sections of shoulder type main valve plugs, when the pressure-reducing valve of the present invention is in metered flow fuel feeding, oil-feed valve port is opened
Degree is identical with aperture at the shoulder of stage casing, and there is good hydraulic power elimination to act on, improve proportioning valve pressure controling precision.
3. using pilot valve oil feeder and main valve plug damper, and it is removably mounted on main valve plug, root can be easy to
Change and adjust according to applying working condition, obtain optimum working performance.
5. using zeroing spring, eliminate prevents command pressure to zero pressure regulation brought because piezoelectric actuator stroke is limited
Range penalty, outlet pressure is set to be adjusted from zero.
The features of the present invention is in particular in following several respects：
1) piezoelectric actuator is employed as an electric electro-mechanical conversion element, the aperture of control pilot valve valve port so that pressure
Oil forms certain pressure in main valve epicoele after the throttle orifice of pilot valve oil feeder and the partial pressure of pilot valve valve port, the pressure
Determined with the ratio of charge oil pressure by the driving voltage of piezoelectric actuator, and as the command signal of main valve.
The main valve upper cavity pressure that pilot valve is determined is determined by following formula
In formula：pcFor main valve upper cavity pressure；
Cd1For the discharge coefficient for orifices of pilot valve oil feeder；
A1For the throttle orifice area of passage of pilot valve oil feeder；
Cd2For pilot valve valve port flow coefficient；
A2For pilot valve valve port area of passage；
psFor charge oil pressure.
The aperture that pilot valve area of passage is controlled by piezoelectric actuator determines.When the bore area of guide valve seat is smaller in the ban,
Negligible influence of the hydraulic coupling to piezoelectric actuator aperture, i.e.,：
A2=π dkxu sinα (2)
In formula：D is the bore diameter of guide's valve seat；
kxFor piezoelectric actuator voltage-displacement coefficient；
U is piezoelectric actuator control voltage；
α is the semi-cone angle of the conical head of pilot valve.
The effect of main valve plug lower end has outlet oil pressure, and according to main valve plug equilibrium equation, can obtain output pressure is：
In formula：poFor output pressure；
K is main valve plug bottom zeroing spring rate；
x0For main valve plug bottom zeroing spring pre compressed magnitude；
FsTo act on the steady-state fluid force on main valve plug；
AcFor main valve plug upper surface area (the upper and lower end face area of main valve plug is identical).
2) pilot valve fuel feeding uses the pilot valve oil feeder (for separate type oil feeder) on main valve plug, and structure is tight
Gather, can change as needed again, realize different pore size fuel feeding.Change the aperture of pilot valve oil feeder, thus it is possible to vary pilot pressure
Adjustable range and main valve response speed.
3) there is the main valve cored structure of three sections of shoulders of stage casing shoulder, reduce the hydraulic power acted on main valve plug, improve control
Precision.The hydraulic power F it can be seen from formula (3)sHave an impact to output pressure.To control its influence degree, it is necessary to take measures
Reduce hydraulic power size.
Main valve plug in this structure has stage casing shoulder, and the distance between three sections of shoulders of upper, middle and lower cause metered flow
When, equal (the stage casing shoulder of main valve plug to valve body of oil-feed port throttling aperture when aperture is with throttling at load port on main valve plug
Undercut groove spacing in the middle part of side wall on endoporus is consistent with oil-feed valve port opening), the now liquid between epimere shoulder and hypomere shoulder
Stream has immediate axial velocity, so as to which axial momentum difference is minimum, has best flow force compensation effect.
4) the zeroing spring of main valve plug lower end, output pressure and charge oil pressure ratio is made to be adjusted from zero.
According to formula (1), due to A2Can not possibly be infinitely great, therefore the pressure p of main valve epicoelecThere is a minimum for being more than zero,
This causes main valve output pressure also to have a minimum for being higher than zero.Therefore, the present invention increases a zeroing in main valve plug lower end
Spring.The difference of the zeroing spring and standard reset spring is：With larger initial compression amount, make due to main valve plug aperture
Zeroing spring force change is smaller caused by change, so that its zeroing effect is stable.
5) the separate type damper (namely main valve plug damper) being installed on main valve plug.The damping hole of main valve plug damper
(namely throttling pore) size determines that damping is strong and weak, and then determines the response stability and speed of main valve.Loading condition is not
Meanwhile different is required to main damping valve device.Main valve plug damper in the present invention can be changed easily, to meet different works
The requirement of condition, and it is easy to process.
6) it is simple and compact for structure, it is convenient to change part.Pilot valve oil feeder and main valve plug damper are integrated with main valve plug,
It is spacing that jump ring is not set on valve body, and limit function is placed on valve block, valve element can be skidded off smoothly.This kind of mode can be very convenient
Change zeroing spring, main valve plug damper and pilot valve oil feeder in ground.
Brief description of the drawings
Fig. 1 is the front view of the proportion expression proportional pressure-reducing valve of the present invention；
Fig. 2 is Fig. 1 left view；
Fig. 3 is Fig. 2 top view；
Fig. 4 is the partial enlarged drawing at Figure 1A.
In figure：Piezoelectric actuator 1, connecting bolt 2, guide's valve seat 3, centre bore 3-1, bore 3-2, pilot valve 4, taper
Head 4-1, pilot valve oil feeder 5, the throttle orifice 5-1 of pilot valve oil feeder 5, valve block 6, oil inlet 6-1, load port 6-2, oil discharge outlet
6-3, the interior shoulder end face 6-4 of valve block 6, main valve plug 7, medium pore canal 7-1, epimere shoulder 7-2, hypomere shoulder 7-3, deep gouge 7-3-
1st, stage casing shoulder 7-4, radial hole 7-5, feedback inclined hole 7-6, valve body 8, central duct 8-1, top endoporus 8-2, lower section endoporus 8-
3rd, middle part endoporus 8-4, main valve plug damper 9, throttling pore 9-1, zeroing spring 10, mounting bracket 11, main valve epicoele 12, main valve
Cavity of resorption 13, sealing ring 1, sealing ring 2 15, sealing ring 3 16, sealing ring 4 17, sealing ring 5 18, the y1 of runner one, runner two
Y2, the y3 of runner three.
Embodiment：
Embodiment one：As shown in Figure 1 to 4, a kind of proportion expression proportional pressure-reducing valve, including piezoelectric actuator 1, elder generation
Pilot valve, main valve, valve block 6 and mounting bracket 11；Described pilot valve includes guide's valve seat 3, pilot valve 4 and pilot valve oil feeder
5；The middle part of guide's valve seat 3, which is from top to bottom provided with centre bore 3-1 and bore 3-2, described main valve coaxial and communicate, to be included
Main valve plug 7, valve body 8, main valve plug damper 9 and zeroing spring 10；
Described piezoelectric actuator 1 is connected by mounting bracket 11 with the upper surface of valve body 8, the lower end of piezoelectric actuator 1
Face is connected that (piezoelectric actuator 1 is directly acted in pilot valve 4, is made with the upper surface of pilot valve 4 (by connecting bolt 2)
Pilot valve 4 produces displacement), described pilot valve 4 is arranged in the centre bore 3-1 of guide's valve seat 3, the top of pilot valve 4
The centre bore 3-1 inner peripheral surface of external cylindrical surface and guide's valve seat 3 coordinate and (form the guide effect to pilot valve 4, improve
The stability of pilot valve 4), the lower end (for conical head 4-1) of pilot valve 4 and the bore 3-2 of guide's valve seat 3 upper port are matched somebody with somebody
Conjunction forms pilot valve valve port, the top that the bottom of guide's valve seat 3 is arranged in the central duct 8-1 of valve body 8 and the two (pass through spiral shell
Line) be detachably connected, the inside of guide's valve seat 3 be provided with the y1 of runner one being connected and runner two y2, the described y1 of runner one with
The centre bore 3-1 of guide's valve seat 3 is communicated, and the inside of valve body 8 is provided with the y3 of runner three communicated with the described y2 of runner two；Described
Pilot valve oil feeder 5 and main valve plug 7 are from top to bottom arranged in the central duct 8-1 of valve body 8, and pilot valve oil feeder 5 is set
The lower section of first guide valve seat 3, the region between pilot valve oil feeder 5 and guide's valve seat 3 are main valve epicoele 12, pilot valve oil feeder
The top and the two (passing through screw thread) that the cylindrical section of 5 bottoms is arranged in the medium pore canal 7-1 of main valve plug 7 are detachably connected；Institute
Bottom that the cylindrical section on the top of main valve plug damper 9 stated is arranged in the medium pore canal 7-1 of main valve plug 7 and the two (pass through spiral shell
Line) it is detachably connected；The outer wall of described main valve plug 7 is provided with three sections of shoulders of upper, middle and lower, the epimere shoulder 7-2 of main valve plug 7 with
Be arranged at the undercut groove side above the side wall of valve body 8 on endoporus 8-2 and cooperatively form oil extraction valve port, the hypomere shoulder 7-3 of main valve plug 7 with
Be arranged at the undercut groove side below the side wall of valve body 8 on endoporus 8-3 and cooperatively form oil-feed valve port, the stage casing shoulder 7-4 of main valve plug 7 with
The undercut groove being arranged in the middle part of the side wall of valve body 8 on endoporus 8-4 is corresponding, forms output water conservancy diversion；The inside of described valve block 6 is provided with
Center cavity, valve body 8 is arranged in the center cavity of valve block 6 and the two detachable (passing through screw thread) connection；Divide on the lateral wall of valve block 6
Not She You oil inlet 6-1, load port 6-2 and oil discharge outlet 6-3, described oil inlet 6-1 is connected with oil-feed valve port, described row
Hydraulic fluid port 6-3 is connected with oil extraction valve port, described load port 6-2 and the undercut groove being arranged on the endoporus 8-4 of the side wall of valve body 8 middle part
It is connected；
When oil-feed valve port is in specified aperture, in the middle part of the stage casing shoulder 7-4 of main valve plug 7 to the described side wall of valve body 8 in
Undercut groove spacing on the 8-4 of hole is consistent with oil-feed valve port opening；When oil extraction valve port is in specified aperture, the stage casing of main valve plug 7
Undercut groove spacing on shoulder 7-4 to endoporus 8-4 in the middle part of the described side wall of valve body 8 is consistent with oil extraction valve port opening (so that main valve
The stage casing shoulder 7-4 of core 7 also forms certain throttling action with the undercut groove in the middle part of the side wall of valve body 8 on endoporus 8-4, mainly plays liquid stream
Flow out guide effect)；Deep gouge 7-3-1 is provided with the hypomere shoulder 7-3 of main valve plug 7, described deep gouge 7-3-1 is by being arranged on master
Radial hole 7-5 in valve element 7 connects with the medium pore canal 7-1 of main valve plug 7, and then connects (oil supply pressure with pilot valve oil feeder 5
Oil can be to the fuel feeding of pilot valve oil feeder 5), undercut grooves of the deep gouge 7-3-1 also with being arranged at below the side wall of valve body 8 on endoporus 8-3
Communicate；
The hypomere shoulder 7-3 upper surfaces of main valve plug 7 are symmetrically provided with two feedback inclined hole 7-6, described two feedback inclined holes
The throttling pore 9-1 that 7-6 is provided with the lower surface of main valve plug damper 9 connect (this two feedback inclined hole 7-6 load port 6-2 is pressed
Power is incorporated into main valve plug damper 9, then introduces the lower surface of main valve plug 7 by the throttling pore 9-1 on main valve plug damper 9,
Form outlet pressure feedback)；It is main valve cavity of resorption 13 that the center cavity of valve block 6, which is located at the lower zone of main valve plug damper 9, described tune
Zero spring 10 is arranged in main valve cavity of resorption 13, and the upper end of zeroing spring 10 is connected with the lower surface of main valve plug damper 9, and return to zero bullet
The lower end of spring 10 is connected with the bottom surface of main valve cavity of resorption 13.
The inside of guide's valve seat 3 is provided with the y1 of runner one and the y2 of runner two being connected, and passes through the fluid that pilot valve overflows
The y1 of the runner one and y2 of runner two flows to the y3 of runner three on valve body 8, then flows to oil discharge outlet 6-3.
Pilot valve oil feeder 5 is threadedly attached in the upper end of main valve plug 7, provided with end face seal, prevents letting out by screw thread
Leakage current amount, avoid influenceing pilot control partial pressure.
Present embodiment is referred to by the use of the throttle orifice 5-1 partial pressures of pilot valve valve port and pilot valve oil feeder 5 as main valve plug 7
Order, utilizes the broad voltage regulation range of spring 10 that returns to zero.
Embodiment two：As shown in figure 1, a kind of proportion expression proportional pressure-reducing valve described in embodiment one, institute
The closure gasket groove one for preventing fluid from leaking is machined with the external cylindrical surface (also referred to as guide section) on the top of pilot valve 4 stated,
Sealing ring 1 is provided with described closure gasket groove one.
Embodiment three：As shown in figure 1, a kind of proportion expression proportional pressure-reducing valve described in embodiment one, institute
The closure gasket groove two for preventing fluid from leaking, described closure gasket groove two are machined with the outer circumference surface for the guide's valve seat 3 stated
Inside it is provided with sealing ring 2 15.
Embodiment four：As shown in figure 1, a kind of proportion expression proportional pressure-reducing valve described in embodiment one, institute
The pilot valve oil feeder 5 the stated lower surface corresponding with the upper surface of main valve plug 7 is provided with closure gasket groove three, described sealing ring
Sealing ring 3 16 (end face seal, preventing the leakage flow by screw thread, avoid influenceing pilot control partial pressure) is provided with groove three.
Embodiment five：As shown in Fig. 1 and Fig. 4, a kind of proportion expression ratio decompression described in embodiment one
Valve, described deep gouge 7-3-1 diameter (be advantageous to reduce axial dimension) of the width more than radial hole 7-5.
Embodiment six：As shown in figure 1, a kind of proportion expression proportional pressure-reducing valve described in embodiment one, institute
The main valve plug damper 9 the stated upper surface corresponding with the lower surface of main valve plug 7 is provided with closure gasket groove four, described sealing ring
Sealing ring 4 17 is provided with groove four.Sealed, ensured using sealing ring i.e. between main valve plug damper 9 and the lower surface of main valve plug 7
The throttling pore 9-1 that fluid all passes through main valve plug damper 9 is fed back, makes damping characteristic more controllable.
Embodiment seven：As shown in figure 1, a kind of proportion expression proportional pressure-reducing valve described in embodiment one, institute
The excircle side of valve body 8 stated is provided with multiple closure gasket grooves five, be provided with each described closure gasket groove five one it is close
Seal 5 18.For isolating fuel feeding, load-side, oil return, feedback oil and leaking.
Embodiment eight：As shown in figure 1, a kind of proportion expression proportional pressure-reducing valve described in embodiment one, institute
Top in the central duct 8-1 for the valve body 8 stated is provided with interior shoulder end face, and the upper end of described guide's valve seat 3 is provided with boss, valve
The interior shoulder end face and the lower surface of the boss of guide's valve seat 3 of body 8 are mutually adjacent to.For axially position.
Embodiment nine：As shown in figure 1, a kind of proportion expression proportional pressure-reducing valve described in embodiment one, institute
The up guide's valve seat 3 by valve body 8 of main valve plug 7 stated limits upper limit by row position, is provided with the center cavity of described valve block 6
Interior shoulder end face 6-4, the interior shoulder end face 6-4 of valve block 6 are arranged in main valve cavity of resorption 13, and main valve plug 7 is descending by valve block 6
The lower limit by row position of shoulder end face 6-4 limitations.
Operation principle：1~Fig. 4 of reference picture；During zero-bit, to oil inlet 6-1 input pressure fluid, pressure oil liquid is through inlet valve
Mouth and radial hole 7-5 enter in the medium pore canal 7-1 of main valve plug 7, by the pilot valve oil feeder for being installed on the upper end of main valve plug 7
5 enter main valve epicoele 12, then the y3 of runner three through pilot valve valve port, the y1 of runner one, the y2 of runner two and valve body 8 flows to oil discharge outlet
6-3。
Pilot valve valve port opening is controlled by piezoelectric actuator 1, the throttling action formed at this and the section of pilot valve oil feeder 5
Discharge orifice 5-1 throttling action determines the oil liquid pressure of main valve epicoele 12.The pressure becomes the command pressure of main valve plug 7.
It is easy for narration, ignore the minor forces that hydraulic power frictional force etc. is acted on main valve plug 7 below.If oil-feed when initial
Valve port is closed, and load port 6-2 pressure is zero, then load port 6-2 pressure passes through a pair of feedback inclined hole 7-6 and master on main valve plug 7
The throttling pore 9-1 of valve element damper 9 enters main valve cavity of resorption 13, and the feedback pressure formed is also zero.Such main valve plug 7 is referring to
Pressure is made to be moved downward under promoting, oil-feed valve port is opened, and pressure oil liquid flows to load port 6-2 from oil inlet 6-1, and is loading
Output pressure is set up at mouth 6-2, then feedback pressure also increases.When command pressure, feedback pressure and the zeroing power of spring 10
When reaching balance, the stop motion of main valve plug 7, it is maintained on the equilbrium position, oil discharge outlet 6-3 pressure is controlled.
If because certain reason causes oil discharge outlet 6-3 pressure changes, such as load flow reduction, oil discharge outlet 6-3 pressure is caused to become
Height, then feedback pressure uprise, then main valve plug 7 is suffered makes a concerted effort upward, and main valve plug 7 will move upwards, turn down oil-feed valve port, reduce to
Load port 6-2 fuel feeding, then load port 6-2 pressure decline, until reaching balance again.
Claims (9)
1. a kind of proportion expression proportional pressure-reducing valve, including piezoelectric actuator（1）, pilot valve, main valve, valve block（6）And mounting bracket
（11）；It is characterized in that：Described pilot valve includes guide's valve seat（3）, pilot valve（4）And pilot valve oil feeder（5）；Guide
Valve seat（3）Middle part be from top to bottom provided with centre bore that is coaxial and communicating（3-1）And bore（3-2）；Described main valve includes
Main valve plug（7）, valve body（8）, main valve plug damper（9）And zeroing spring（10）；
Described piezoelectric actuator（1）Pass through mounting bracket（11）With valve body（8）Upper surface connection, piezoelectric actuator（1）'s
Lower surface and pilot valve（4）Upper surface connection, described pilot valve（4）It is arranged on guide's valve seat（3）Centre bore（3-
1）It is interior, pilot valve（4）The external cylindrical surface on top and guide's valve seat（3）Centre bore（3-1）Inner peripheral surface coordinate, pilot valve
Core（4）Lower end and guide's valve seat（3）Bore（3-2）Upper port cooperatively form pilot valve valve port, guide's valve seat（3）Under
Portion is arranged on valve body（8）Central duct（8-1）Interior top and the two be detachably connected, guide's valve seat（3）Inside be provided with
The runner one being connected（y1）With runner two（y2）, described runner one（y1）With guide's valve seat（3）Centre bore（3-1）Phase
It is logical, valve body（8）Inside be provided with and described runner two（y2）The runner three communicated（y3）；
Described pilot valve oil feeder（5）And main valve plug（7）From top to bottom it is arranged on valve body（8）Central duct（8-1）It is interior, and
Pilot valve oil feeder（5）It is arranged on guide's valve seat（3）Lower section, pilot valve oil feeder（5）With guide's valve seat（3）Between region
For main valve epicoele（12）, pilot valve oil feeder（5）The cylindrical section of bottom is arranged on main valve plug（7）Medium pore canal（7-1）Interior
Top and the two be detachably connected；Described main valve plug damper（9）The cylindrical section on top be arranged on main valve plug（7）Center
Duct（7-1）Interior bottom and the two be detachably connected；Described main valve plug（7）Outer wall be provided with three sections of shoulders of upper, middle and lower,
Main valve plug（7）Epimere shoulder（7-2）With being arranged at valve body（8）Endoporus above side wall（8-2）On undercut groove side cooperatively form
Oil extraction valve port, main valve plug（7）Hypomere shoulder（7-3）With being arranged at valve body（8）Endoporus below side wall（8-3）On undercut groove side
Cooperatively form oil-feed valve port, main valve plug（7）Stage casing shoulder（7-4）With being arranged at valve body（8）Endoporus in the middle part of side wall（8-4）On
Undercut groove is corresponding；Described valve block（6）Inside be provided with center cavity, valve body（8）It is arranged on valve block（6）Center cavity in and two
Person is detachably connected；Valve block（6）Lateral wall on be respectively equipped with oil inlet（6-1）, load port（6-2）And oil discharge outlet（6-3）, institute
The oil inlet stated（6-1）It is connected with oil-feed valve port, described oil discharge outlet（6-3）It is connected with oil extraction valve port, described load
Mouthful（6-2）With being arranged at valve body（8）Endoporus in the middle part of side wall（8-4）On undercut groove be connected；
When oil-feed valve port is in specified aperture, main valve plug（7）Stage casing shoulder（7-4）To described valve body（8）In the middle part of side wall
Endoporus（8-4）On undercut groove spacing it is consistent with oil-feed valve port opening；When oil extraction valve port is in specified aperture, main valve plug（7）
Stage casing shoulder（7-4）To described valve body（8）Endoporus in the middle part of side wall（8-4）On undercut groove spacing and oil extraction valve port opening one
Cause；Main valve plug（7）Hypomere shoulder（7-3）On be provided with deep gouge（7-3-1）, described deep gouge（7-3-1）By being arranged on main valve
Core（7）Interior radial hole（7-5）With main valve plug（7）Medium pore canal（7-1）Connection, so with pilot valve oil feeder（5）Connection,
Deep gouge（7-3-1）Also with being arranged at valve body（8）Endoporus below side wall（8-3）On undercut groove communicate；
Main valve plug（7）Hypomere shoulder（7-3）Upper surface is symmetrically provided with two feedback inclined holes（7-6）, two described feedbacks are tiltedly
Hole（7-6）With main valve plug damper（9）The throttling pore that lower surface is provided with（9-1）Connection；Valve block（6）Center cavity be located at main valve
Core damper（9）Lower zone is main valve cavity of resorption（13）, described zeroing spring（10）It is arranged on main valve cavity of resorption（13）It is interior, zeroing
Spring（10）Upper end and main valve plug damper（9）Lower surface connection, return to zero spring（10）Lower end and main valve cavity of resorption（13）
Bottom surface connects.
A kind of 2. proportion expression proportional pressure-reducing valve according to claim 1, it is characterised in that：Described pilot valve（4）On
The closure gasket groove one for preventing fluid from leaking is machined with the external cylindrical surface in portion, sealing is provided with described closure gasket groove one
Circle one（14）.
3. according to a kind of proportion expression proportional pressure-reducing valve described in claim 1, it is characterised in that：Described guide's valve seat（3）It is outer
The closure gasket groove two for preventing fluid from leaking also is machined with periphery, sealing ring two is provided with described closure gasket groove two
（15）.
4. according to a kind of proportion expression proportional pressure-reducing valve described in claim 1, it is characterised in that：Described pilot valve oil feeder（5）
With main valve plug（7）The corresponding lower surface in upper surface be provided with closure gasket groove three, be provided with described closure gasket groove three close
Seal three（16）.
5. according to a kind of proportion expression proportional pressure-reducing valve described in claim 1, it is characterised in that：Described deep gouge（7-3-1）Width
Degree is more than radial hole（7-5）Diameter.
6. according to a kind of proportion expression proportional pressure-reducing valve described in claim 1, it is characterised in that：Described main valve plug damper（9）
With main valve plug（7）The corresponding upper surface in lower surface be provided with closure gasket groove four, be provided with described closure gasket groove four close
Seal four（17）.
7. according to a kind of proportion expression proportional pressure-reducing valve described in claim 1, it is characterised in that：Described valve body（8）Outer circumferential sides
Face is provided with multiple closure gasket grooves five, and a sealing ring five is provided with each described closure gasket groove five（18）.
8. according to a kind of proportion expression proportional pressure-reducing valve described in claim 1, it is characterised in that：Described valve body（8）Centre bore
Road（8-1）Interior top is provided with interior shoulder end face, described guide's valve seat（3）Upper end be provided with boss, valve body（8）Interior shoulder
End face and guide's valve seat（3）The lower surface of boss be mutually adjacent to.
A kind of 9. proportion expression proportional pressure-reducing valve according to claim 1, it is characterised in that：Described main valve plug（7）It is up
By valve body（8）Interior guide's valve seat（3）Limit by row position in limitation, described valve block（6）Center cavity in be provided with interior shoulder end
Face（6-4）, valve block（6）Interior shoulder end face（6-4）It is arranged on main valve cavity of resorption（13）It is interior, main valve plug（7）It is descending to rely on valve block（6）
Interior shoulder end face（6-4）The lower limit by row position of limitation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610388344.3A CN105909844B (en) | 2016-06-02 | 2016-06-02 | Proportion expression proportional pressure-reducing valve |
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|---|---|---|---|
| CN201610388344.3A CN105909844B (en) | 2016-06-02 | 2016-06-02 | Proportion expression proportional pressure-reducing valve |
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| CN105909844A CN105909844A (en) | 2016-08-31 |
| CN105909844B true CN105909844B (en) | 2017-12-29 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107289191A (en) * | 2017-07-18 | 2017-10-24 | 中国航空工业集团公司西安飞行自动控制研究所 | A kind of valve core structure of adjustable output gain |
| CN109707886A (en) * | 2019-01-11 | 2019-05-03 | 北京蓝箭空间科技有限公司 | Two-stage guide's pressure reducer |
| CN109798270B (en) * | 2019-02-25 | 2020-05-19 | 哈尔滨工业大学 | Multi-mode energy-saving servo actuator and method for realizing multi-mode energy saving |
| CN111853099B (en) * | 2020-07-13 | 2021-06-25 | 哈尔滨工业大学 | Moving-coil type two-position three-way high-speed switch valve for vehicle |
| CN112503042B (en) * | 2020-09-14 | 2022-09-27 | 宁波华液机器制造有限公司 | Pilot valve structure and proportional pressure reducing valve |
| CN115750902B (en) * | 2022-11-29 | 2023-06-09 | 富阳通力机械制造有限公司 | Two-dimensional electro-hydraulic proportional valve manual unloading structure for quick self-locking jack |
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| CN2272083Y (en) * | 1996-05-20 | 1998-01-07 | 杭州精工液压机电有限公司 | Differential pressure feedback cone valve electrohydraulic proportional pressure reducing vavle |
| CN2806923Y (en) * | 2005-06-20 | 2006-08-16 | 浙江大学 | Series connection air-resistance pilot type ultra-high pneumatic proportional pressure-reducing valve |
| CN204099328U (en) * | 2014-08-12 | 2015-01-14 | 徐工集团工程机械股份有限公司 | A kind of guide device of proportional multi-way valve |
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|---|---|---|---|---|
| US3265089A (en) * | 1963-12-11 | 1966-08-09 | Concordia Masch & Elekt | Three-way safety double valve |
| US4391296A (en) * | 1981-05-07 | 1983-07-05 | Abbott John D | By-pass pilot operated hydraulic check valve |
| CN2272083Y (en) * | 1996-05-20 | 1998-01-07 | 杭州精工液压机电有限公司 | Differential pressure feedback cone valve electrohydraulic proportional pressure reducing vavle |
| CN2806923Y (en) * | 2005-06-20 | 2006-08-16 | 浙江大学 | Series connection air-resistance pilot type ultra-high pneumatic proportional pressure-reducing valve |
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|---|---|
| CN105909844A (en) | 2016-08-31 |
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