CN108757622A - Direct Action Type digital servo valve - Google Patents
Direct Action Type digital servo valve Download PDFInfo
- Publication number
- CN108757622A CN108757622A CN201810922805.XA CN201810922805A CN108757622A CN 108757622 A CN108757622 A CN 108757622A CN 201810922805 A CN201810922805 A CN 201810922805A CN 108757622 A CN108757622 A CN 108757622A
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- Prior art keywords
- spool
- connecting seat
- stepper motor
- valve
- servo valve
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- 238000005859 coupling reaction Methods 0.000 claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 7
- 238000011109 contamination Methods 0.000 abstract description 10
- 239000003921 oil Substances 0.000 description 44
- 230000000694 effects Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 101100293608 Hordeum vulgare NAS9 gene Proteins 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 101150005408 nas-6 gene Proteins 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 101100293600 Hordeum vulgare NAS5 gene Proteins 0.000 description 1
- 101100529032 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) RPN5 gene Proteins 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
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- 230000036316 preload Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/16—Special measures for feedback, e.g. by a follow-up device
Abstract
The present invention provides a kind of Direct Action Type digital servo valve, and using discrete control, valve core driving force is big, and spool is not easy bite, improves the contamination resistance of servo valve.The Direct Action Type digital servo valve of the present invention, including stepper motor, shaft coupling, valve body and spool, the valve body have axially through valve chamber, and the oil inlet being connected to the valve chamber, oil return opening and at least two actuator ports, the spool has at least two working positions, one end for switching shaft coupling described in the actuator port and flow that are connected to the oil inlet and the oil return opening is fixedly connected with the output shaft of the stepper motor, the first end of the other end and the spool is circumferentially fixed, axially movable connection, the second end of the spool is connect with the valve body screw thread, so that the relatively described valve body of the spool is circumferentially rotated the screw of conversion in an axial direction, and then switches the working position and realize continuously adjusting for flow.
Description
Technical field
The present invention relates to servo valve technology fields, more particularly to Direct Action Type digital servo valve.
Background technology
As industry is toward automation development, more and more hydraulic control systems use servo-drive system, and hydraulic servo system
The core control element of system is servo valve, control accuracy, the reliability of the direct decision systems of quality.The common servo valve in market
It is divided into nozzle-flapper servo valve, jet pipe servo valve, high frequency sound proportional servo valve etc. by structure.
Nozzle-flapper servo valve is that servo valve most general at present is adopted using four consistent small-bores throttling hole nozzles
Drive baffle, control accuracy high with torque-motor.But frequency response is high, requires oil cleanliness high, poor reliability, often
There are the failures such as spray nozzle clogging, nozzle erosion, spool bite.
Jet pipe servo valve is slightly strong compared with the contamination resistance of nozzle-flapper servo valve, but manufacture difficulty is big, and consistency is poor, control
Difficulty processed is high, elastic jet pipe and by oilhole easy break-down, and of high cost, market is using less.
High frequency sound proportional servo valve is directly driven using ratio straight line reversing motor, and displacement sensor is arranged on spool
Spool position is detected, it is internal to be controlled by Analogous Integrated Electronic Circuits composition closed loop amplifying return circuit.But because of the two-way horse of ratio straight line
The driving force reached is limited (being less than 150N), and stroke is short, and contamination resistance is limited, and controls complexity, spool bite and control easily occurs
Making sheet card such as burns at the failures.
As it can be seen that the above servo valve all has contamination resistance difference, easily break down because oil deteriorates.
Therefore, a kind of Direct Action Type digital servo valve how is designed, to improve the contamination resistance of servo valve, and realizes number
Amount control is the technical issues of this field is badly in need of solving.
Invention content
The object of the present invention is to provide a kind of Direct Action Type digital servo valves, and by Digital Signals, valve core driving force is big,
Spool is not easy bite, improves the contamination resistance of servo valve
To achieve the above object, the present invention provides a kind of Direct Action Type digital servo valve, including stepper motor, shaft coupling,
Valve body and spool, the valve body have axially through valve chamber and the oil inlet, the oil return opening and at least that are connected to the valve chamber
Two actuator ports, the spool have at least two working positions, are connected to the oil inlet and the oil return opening for switching
The actuator port；One end of the shaft coupling is fixedly connected with the output shaft of the stepper motor, the other end and the valve
The first end of core is circumferentially fixed, axially movable connection, and the second end of the spool is connected with the valve body by nut external threading
It connects, so that the relatively described valve body of the spool is circumferentially rotated the screw of conversion in an axial direction, and then switches the work
Simultaneously realize continuously adjusting for flow in position.
The Direct Action Type digital servo valve of the present invention, on the one hand, driven using stepper motor, distant place control can be received
The digital pulse signal of device, and then it is converted into rotation angle, angular speed and the direction of the output shaft of stepper motor, wherein pulse
The rotation angle of the corresponding stepper motor of number, pulse frequency correspond to angular speed, and pulse direction corresponds to positive and negative rotation, compared with the existing technology
Analog control, the present invention using discrete control have many advantages, such as control accuracy height, stability it is good.On the other hand, spool
First end circumferentially rotated under the driving of stepper motor, the other end is connect with valve body screw thread, and then circumferentially rotating spool
It is converted into the screw of opposite valve body, and then is moved back and forth along the axial screw of valve body, with switch operating position；Relative to existing
There is the linear motion of technology, the resistance of this screw is smaller, and the driving force of spool is big, and spool is not easy bite, greatly improves
Contamination resistance, can under conditions of the cleannes of fluid are NAS9 reliably working, failure rate is low, it is not necessary that oil filter is arranged just
It can work, use is simple and reliable.
Optionally, further include resetting-mechanism, for driving the valve core reset after the stepper motor dead electricity.
Optionally, further include connect cover, the both ends of the connect cover respectively with the output end of the stepper motor and described
One end of valve chamber is tightly connected, and the shaft coupling is placed in the connect cover, the output shaft of the stepper motor and the spool
First end stretched into the connect cover by axial both ends respectively, to be connect respectively with the both ends of the shaft coupling.
Optionally, the resetting-mechanism includes torsional spring and the connecting seat that is fixedly connected with the both ends of the torsional spring, the company
Connecing cover tool, there are two the convex limiting sections of axially opposing setting；When the stepper motor positive and negative rotation, the output of the stepper motor
One of the first end of axis and the spool pushes the connecting seat circumferential movement with end, the connecting seat of the other end
The convex limiting section for being circumferentially connected to the other end generates the spring force of reset to reverse the torsional spring.
Optionally, the resetting-mechanism further includes motor connecting base and spool connecting seat, and the motor connecting base socket is solid
Due to the output shaft of the stepper motor, the spool connecting seat is socketed on the first end of the spool circumferentially fixedly；Both ends
The connecting seat all have interior protuberance, the motor connecting base and the spool connecting seat all have with respectively with the described of end
Interior protuberance circumferentially supports the male part of cooperation.
Optionally, the connecting seat at both ends all has evagination limiting section, described outer when the spool is in initial position
Convex positive stop portion is abutted with the convex limiting section circumferential direction respectively with end, and the circumferential abutting force at both ends is on the contrary, with described in preload
Torsional spring when the stepper motor positive and negative rotation, pushes the connecting seat of one end to be detached from the convex limiting section abutted, in turn
Along the direction circumferential movement for increasing pretightning force.
Optionally, when being in the male part promotion of one end with the interior protuberance held, with the outer convex positive stop at end
Portion is detached from the convex limiting section and keeps not contacting；The male part in the other end is de- with the corresponding interior protuberance
From and keep do not contact, the convex limiting section of the other end is kept in contact with the corresponding evagination limiting section.
Optionally, the output shaft of the stepper motor is fixed by one end of the motor connecting base and the shaft coupling and is connected
It connects, the spool connecting seat is fixedly connected with the other end of the shaft coupling, and the spool connecting seat has guide sleeve, described to lead
The axially movable connection of first end to set and the spool.
Optionally, there is the connecting seat sleeve part, the torsional spring to be socketed on outside the sleeve part, described in both ends
There is axial gap between the sleeve part of connecting seat.
Optionally, the nut set is fixedly connected with the valve body, and the second end of the spool is fixedly connected with it together
The leading screw that axis is arranged and coordinates with nut set.
Optionally, further include the nut mounting base covered for installing the nut, one end of the nut mounting base and institute
It states the one end of valve chamber far from the stepper motor to be tightly connected, the other end is sealedly connected with the end cap with vessel, the vessel
For accommodating part of the leading screw far from the second end.
Description of the drawings
Fig. 1 is that Direct Action Type digital servo valve provided by the present invention is in cuing open for initial position in a specific embodiment
Face structural schematic diagram；
Fig. 2 is the sectional view in the directions A-A in Fig. 1；
Fig. 3 is the sectional view in the directions B-B in Fig. 1；
Fig. 4 is cross-sectional view when Direct Action Type digital servo valve shown in Fig. 1 is in the first working position；
Fig. 5 is the sectional view in the directions C-C in Fig. 4；
Fig. 6 is the sectional view in the directions D-D in Fig. 4；
Fig. 7 is cross-sectional view when Direct Action Type digital servo valve shown in Fig. 1 is in the second working position；
Fig. 8 is the sectional view in the directions E-E in Fig. 7；
Fig. 9 is the sectional view in the directions F-F in Fig. 7.
In Fig. 1-Fig. 9：
1- stepper motors, 2- connect covers, 3- motor connecting bases, the first connecting seats of 4-, 5- torsional springs, 6- shaft couplings, 7- second
Connecting seat, 8- spool connecting seats, 9- valve bodies, 10- spools, 11- nut sets, 12- leading screws, 13- nut mounting bases, 14- output shafts,
15- end caps, 16- valve chambers, 17- the first convex limiting sections, 18- the second convex limiting sections, the first interior protuberances of 19-, the second convexes of 20-
Portion, the first male parts of 21-, the second male parts of 22-, 23- the first evagination limiting sections, 24- the second evagination limiting sections, 25- torque arm；
P- oil inlets, T- oil return openings, the first actuator ports of A-, the second actuator ports of B-.
Specific implementation mode
Below in conjunction with attached drawing, the specific implementation mode of the present invention is introduced, so that those skilled in the art accurately manage
Solve technical scheme of the present invention.
Axial, circumferential direction and radial direction as described herein are reference with the spool 10 of Direct Action Type digital servo valve, with the spool
10 extending direction and direction of action is axial, and direction is surround with the outer wall that the diametric(al) of the spool 10 is the radial spool 10
For circumferential direction.
As described herein first, second equal words are only used for distinguishing more than two components of same or like structure, or
Same or similar more than two structures, do not indicate that the particular determination to sequence.
As described herein inside and outside using the central axes of spool 10 as reference, the direction close to central axes is interior, far from central axes
Direction be outer.
As stated in the background art, currently used servo valve is by structure nozzle-flapper servo valve, jet pipe servo valve, high frequency
Ring proportional servo valve.
Nozzle-flapper servo valve is driving indirectly, realizes that the linear motion of spool, pressure difference are logical by the pressure difference at spool both ends
Cross the variable hydraulic resistance circuit control of guide's nozzle and bourdon tube baffle, jet nozzle and refraction hole composition.Under equilibrium state, two
Symmetrical nozzle is identical at a distance from baffle, and liquid resistance is identical, therefore, identical (the spool both sides area phase of pressure of spool both sides
Deng), it is in stable state.When torque rotates, baffle position changes, and the nozzle of both sides is different at a distance from baffle,
Side becomes larger, and the other side becomes smaller, and therefore, liquid resistance also becomes smaller for one, and one becomes larger, and the pressure at spool both ends is different, pushes valve
Core is moved toward low-pressure end；Meanwhile the lower end of baffle being driven to move, until two nozzles are the same with a distance from baffle, the position of spool
It sets directly proportional to torque-motor torque.
Jet pipe servo valve is driving indirectly, realizes that the linear motion of spool, pressure difference pass through by the pressure difference at spool both ends
High-pressure jet pipe with by oilhole board group at variable hydraulic resistance circuit control.Under equilibrium state, jet pipe nozzle is in two symmetrically
The centre in hole, liquid resistance is identical, and therefore, the pressure of spool both sides is identical (spool both sides area equation), is in stable state.Work as power
When square rotates, jet pipe nozzle location changes, and nozzle is different at a distance from two holes by oilhole plate, and side is big, separately
Side is small, and therefore, liquid resistance is also different, and the pressure at spool both ends is different, and spool is pushed to be moved toward low-pressure end；Meanwhile it driving
It is moved in the opposite direction by oilhole plate, until by two, positions of spool the same at a distance from nozzle by oilhole of oilhole plate
It is directly proportional to torque-motor torque.
High frequency sound proportional servo valve is directly driven by the two-way force motor of ratio straight line, and displacement sensing is arranged on spool
Device, the position for detecting spool are internal to be controlled by Analogous Integrated Electronic Circuits composition closed loop amplifying return circuit.
As it can be seen that in the prior art, nozzle-flapper servo valve and jet pipe servo valve are using first drain resistance control, nozzle flapper
The nozzle of servo valve, the nozzle of jet pipe, by oilhole plate oilhole throttle orifice it is small, and require consistent, usually require that diameter is less than
0.3mm, bourdon tube baffle are short at a distance from nozzle (distance is about 0.1~0.2mm).Therefore, nozzle throttle orifice easily blocks, gear
Plate is perishable, and contamination resistance is poor, requires hydraulic pressure cleannes high, it is desirable that is less than NAS5 grades, zero easily deviates, and manufactures hardly possible
Road is big.The contamination resistance of jet pipe servo valve is slightly stronger than nozzle flapper, is NAS6 grades, but manufacture difficulty is big, stability
Difference, price is high, and is Analog control.
High frequency sound proportional servo valve is to directly drive, but the driving force of the two-way force motor of ratio straight line is smaller (usual to drive
Power is not more than 150N), and need the closed-loop control of outer displacement sensor composition analog quantity.Therefore, spool is easy because of oily difference
Bite, contamination resistance are poor, it is desirable that oily cleannes are NAS6 grades, and control is more complex and of high cost.Furthermore in card
After puckery, control terminal meeting wrong diagnosis is to be short of power, and further increases driving force, causes spool final stuck or even damage.
NAS herein refers to NAS1638 standards, is oil cleanness grade scale, which is US Airways space flight work
Industry federation (AIA) proposes in January, 1964, is once used widely in the U.S. and countries in the world, the industry-by-industry in China
It is still widely adopted, is the source of the standards such as currently widely used ISO11218, GJB420-87A grading system in China, AS4059
Head.
In view of the above technical problems, present solution provides a kind of Direct Action Type digital servo valves, are driven using stepper motor 1,
The driving force of spool 10 is big, and antipollution is strong, and control is simple.Wherein, stepper motor 1 receive digital pulse signal, output torque and
Angular displacement, the stepper motor 1 are connect by shaft coupling 6 with one end of spool 10, and the other end and 9 screw thread of valve body of spool 10 connect
It connects.At this point, the angle that stepper motor 1 exports is converted into the rotation angle of spool 10, at the same and it is by screw thread that spool 10 is opposite
Valve body 9 circumferentially rotates the screw being converted into an axial direction.The rectilinear path of the screw in the axial direction and stepper motor 1
Angle it is proportional, spool 10 rotate both forward and reverse directions be consistent with motor positive and inverse, spool 10 in the axial direction straight line drive
Power is directly proportional to the output torque of stepper motor 1, is inversely proportional with the helical pitch of screw.Therefore, pass through reasonable disposition stepping
The amount torque of motor 1 and the helical pitch of screw connection structure, can make spool 10 obtain big axial thrust.
As shown in Figure 1, this programme is related to a kind of Direct Action Type digital servo valve, including valve body 9 and spool 10, valve body 9 have
Valve chamber 16, oil inlet P, oil return inlet T and at least two actuator ports, valve chamber 16 are arranged axially through valve body 9, oil return inlet T and valve
Chamber 16 is connected to；Spool 10 have at least two working positions, be in a working position when, spool 10 by one of actuator port with
Oil inlet P is connected to, another actuator port is connected to oil return inlet T, and when being in another working position, spool 10 will be with oil inlet P
Two actuator ports being connected to oil return inlet T exchange, i.e., former that actuator port being connected to oil inlet P is switched to and oil return opening
T is connected to, and the actuator port that original is connected to oil return inlet T is switched to be connected to oil inlet P；Alternatively, when valve body 9 is including three or more
When a actuator port, each actuator port can form several combinations in pairs, can switch work when spool 10 acts
Make position, to change the actuator port being connected to oil inlet P and oil return inlet T.For purposes of illustration only, herein only two working oils are arranged
For mouthful.
To complete the working position switching of spool 10, the Direct Action Type digital servo valve of this programme further includes stepper motor 1 and connection
Spool 10 is connect by axis device 6 by shaft coupling 6 with stepper motor 1, and for ease of distinguishing, the axial both ends of spool 10 are defined as
First end and second end, one end of the shaft coupling 6 are fixedly connected with the output shaft 14 of stepper motor 1, the other end and spool 10
First end is circumferentially fixed, axially movable connection, and the second end of spool 10 is threadedly coupled with valve body 9, so that spool 10 is opposite
Valve body 9 circumferentially rotates the screw being converted into an axial direction, is moved when spool 10 is axial in a manner of screw with respect to valve body 9
When dynamic, thus it is possible to vary the actuator port being connected with oil inlet P and oil return inlet T, and then complete the switching of working position；Also, valve
Core 10 can realize continuously adjusting for flow, at this point, the adjusting of flow is also stepless with respect to the step-less adjustment in the axial direction of valve body 9
's.
For purposes of illustration only, herein for two actuator ports are arranged, one of actuator port is defined as the first work
Hydraulic fluid port A, another actuator port are defined as the second actuator port B.
The present invention spool 10 also have there are one initial position, state shown in FIG. 1 is that spool 10 is in initial position,
In the initial position, spool 10 blocks oil inlet P and oil return inlet T, and the first actuator port A and the second actuator port B do not work.
Alternatively, in initial position, those skilled in the art can be arranged as required to certain offset, by oil inlet P and the first work
Make hydraulic fluid port A to be connected to smaller circulation, oil return inlet T is connected to the second actuator port B with smaller circulation, and it is inclined to constitute zero
It moves, forms an initial position of offset zero small distance, meet special use demand.When need carry out zero migration
When, oil inlet P can also be connected to the second actuator port B with smaller circulation by those skilled in the art as needed, be returned
Hydraulic fluid port T is connected to the first actuator port A with smaller circulation, obtains another initial position of offset zero small distance.
When in the first working position, spool 10 is moved towards the right side in Fig. 1, is discharged oil inlet P and oil return inlet T, is made
Oil inlet P is obtained to be connected to the first actuator port A by valve chamber 16, oil return inlet T is connected to by valve chamber 16 with the second actuator port B,
As shown in Figure 4；When in the second working position, spool 10 is moved towards the left side in Fig. 1, by the first actuator port A and oil return inlet T
Connection, the second actuator port B is connected to oil inlet P, as shown in Figure 7.
Due to being driven using stepper motor 1, the digital pulse signal of distant place controller can be received, and then be converted into
Rotation angle, angular speed and the direction of the output shaft 14 of stepper motor 1.Wherein, umber of pulse corresponds to the rotation angle of stepper motor 1
Degree, pulse frequency correspond to angular speed, and pulse direction corresponds to positive and negative rotation, Analog control compared with the existing technology, have precision
High, the advantages that stability is good.
Again since the first end of spool 10 circumferentially rotates under the driving of stepper motor 1, second end connects with 9 screw thread of valve body
It connects, under the circumferential position-limiting action of valve body 9, spool 10 circumferentially rotates the screw for being converted into opposite valve body 9, the spiral
The direction of movement is in axial so that spool 10 along valve body 9 axial screw move back and forth, and then in the first working position and the
It is switched between two working positions；When spool 10 is axially moved, the first end of spool 10 shaft coupling 6 can move axially relatively,
Therefore the first end of spool 10 uses circumferentially fixed, axially movable connection type with shaft coupling 6.To realize the first of spool 10
Feather key cooperation may be used in the axially movable connection at end and shaft coupling 6 between the first end and shaft coupling 6 of spool 10, you can
Slide key is arranged in the first end of spool 10, keyway is arranged with the corresponding position of shaft coupling 6, realizes axial sliding fit, with
It is slidably connected as axially movable connection type herein.
Conventional linear motion in compared with the existing technology, spool 10 of the invention is using the form of screw in axial direction
Upper movement, the resistance of motion is smaller, is not easy bite；Especially, the linear driving force of spool 10 in the axial direction and stepper motor 1 is defeated
Go out that torque is directly proportional, be inversely proportional with the helical pitch of screw, the driving motor of the stepper motor 1 and existing servo valve is same in output
Etc. in the case of driving forces, spool 10 of the invention can obtain the axial driving force of bigger, to which antipollution greatly improved
Ability, can the cleannes of fluid be NAS9 grades under conditions of reliably working, failure rate is low, it is not necessary that oil filter is arranged.
To realize the connection of stepper motor 1 and valve body 9, Direct Action Type digital servo valve (hereinafter referred to as servo valve) of the invention
Further include connect cover 2, the both ends of connect cover 2 are tightly connected with one end of the output end of stepper motor 1 and valve chamber 16 respectively, shaft coupling
Device 6 is placed in the connect cover 2, at this point, the output shaft 14 of stepper motor 1 and the first end of spool 10 are stretched by axial both ends respectively
In connect cover 2, to be connect respectively with the both ends of shaft coupling 6.The output end of so-called stepper motor 1 refers to one equipped with output shaft 14
End, corresponds to the left end of stepper motor 1, the first end of spool 10 corresponds to the right end of spool 10 in Fig. 1 in Fig. 1.
Using the structure type of connect cover 2, on the one hand, the both ends of connect cover 2 can respectively with valve body 9 and stepper motor 1
It is tightly connected, ensures the sealing reliability of valve body 9；On the other hand, connect cover 2 is by the output shaft 14 and spool of stepper motor 1
10 first end, shaft coupling 6 hermetically cover, and realize the effective protection to these components, location structure can also be arranged
Realize the fixation to shaft coupling 6.
The connect cover 2 can specifically be set as bell-jar, and the shell of stepper motor 1 is fixed on the bell-jar, and make
The output shaft 14 of stepper motor 1 passes through the bell-jar, then the open end of bell-jar is covered on to one end of valve body 9, with valve chamber 16
It is tightly connected.
In conjunction with Fig. 2 and Fig. 3, the invention also includes resetting-mechanisms, for multiple in 1 dead electricity rear-guard movable valve plug 10 of stepper motor
Position, so that the initial position of spool 10 does not deviate.
The resetting-mechanism includes torsional spring 5 and the connecting seat that is fixedly connected with the both ends of torsional spring 5, and there are two axis for the tool of connect cover 2
To the convex limiting section being oppositely arranged, when spool 10 is in initial position, the connecting seat at both ends is respectively with respective the same as the convex held
Limiting section circumferentially abuts, and the direction of the circumferential abutting force at both ends, on the contrary, one end is abutted along clockwise, other end edge is supported counterclockwise
It connects, to pre-tighten torsional spring 5.
When stepper motor 1 is rotated forward or is inverted, the output shaft 14 of stepper motor 1 and one of the first end of spool 10,
It pushes and is detached from abutted convex limiting section with the connecting seat each in the same end, and then is circumferential along the direction for increasing pretightning force
Movement, so that torsional spring 5 further reverses, increased pretightning force can be as the spring force resetted.
It is understood that in initial position, torsional spring 5 can also be in free state, the connecting seat at both ends with respectively
Corresponding convex limiting section contacts but does not generate circumferential withstanding effect power；When stepper motor 1 rotates, output shaft 14 or valve are driven
Core 10 drive one of connecting seat be detached from the contact circumferential movement of convex limiting section, another connecting seat be circumferentially connected to and
Its corresponding convex limiting section and circumferentially limited, torsional spring 5 is twisted, and can also generate the spring force of reset.But when torsional spring 5 exists
For initial position by pre- next, stepper motor 1 can further reverse torsional spring 5 when rotating, and obtain the spring force of bigger, improve and reset
Reliability, avoid spool 10 reply it is not in place or deviate initial position, improve operation precision.
For ease of distinguishing, the connecting seat of 5 one end of torsional spring can be defined as the first connecting seat 4, by the connecting seat of the other end
It is defined as the second connecting seat 7, torsional spring 5 is mounted between the first connecting seat 4 and the second connecting seat 7.In detail, torsional spring 5 is with it
The torque arm 25 of one end is fixedly connected with the first connecting seat 4, is fixedly connected with the second connecting seat 7 with the torque arm 25 of its other end, when
When first connecting seat 4 and the second connecting seat 7 reverse in the opposite direction in the circumferential, prefastening torque can be generated so that
Torsional spring 5 is in Pre strained state.
Similarly, for ease of distinguishing, the convex limiting section coordinated with the first connecting seat 4 is defined as the first convex limiting section
17, the convex limiting section coordinated with the second connecting seat 7 is defined as the second convex limiting section 18.First convex limiting section 17 and
Two convex limiting sections 18 project radially inwards setting by the inner wall of connect cover 2, and are in axially opposing both direction, and first
Connecting seat 4 can be with the 17 axially opposing fixation of the first convex limiting section, the second connecting seat 7 and the axial phase of the second convex limiting section 18
To fixation.It realizes that axially opposing fixed mode is various, can specifically be realized by structures such as card slots, as shown in Figure 1.
Meanwhile first connecting seat 4 and the second connecting seat 7 evagination limiting section can be set, be set to the evagination of the first connecting seat 4
Limiting section is defined as the first evagination limiting section 23, and the second evagination limiting section is defined as set on the evagination limiting section of the second connecting seat 7
24, the first evagination limiting section 23 can abut in the circumferential with the first convex limiting section 17, in the second evagination limiting section 24 and second
Convex positive stop portion 18 can abut in the circumferential, form circumferential limit cooperation.
As shown in Figures 2 and 3, the first convex limiting section 17 and the second convex limiting section 18 may be at the same of connect cover 2
One circumferential position, the first evagination limiting section 23 are abutted by the side of the first convex limiting section 17 in the circumferential, the second outer convex positive stop
Portion 24 is abutted by the other side of the second evagination limiting section 24 in the circumferential, so as to convex positive stop in the first convex limiting section 17 and second
Opposite both direction acts on the torsional spring 5 in the circumferential in portion 18 so that torsional spring 5 is pre-tightened.
It being illustrated with the orientation of Fig. 2 and Fig. 3, the first convex limiting section 17 acts on torsional spring 5 along clockwise direction, the
Two convex limiting sections 18 act on torsional spring 5 along direction counterclockwise, so that torsional spring 5 is twisted relative to free state, obtain
Pretightning force.When being operated, one end torque arm 25 that torsional spring 5 can be connected with the first connecting seat 4 is turned round along clockwise direction
It is fixed after turning 90 degree or so, the torque arm 25 of the other end is fixed after 90 degree or so of torsion counterclockwise with the second connecting seat 7；
Then, the first connecting seat 4 is circumferentially abutted with its first evagination limiting section 23 with the first convex limiting section 17, circumferential predetermined to realize
Position, the second connecting seat 7 are circumferentially abutted with its second evagination limiting section 24 with the second convex limiting section 18, circumferential predetermined to realize
Position, at this point, spool 10 is in initial position, torsional spring 5 is pre-tightened.
The resetting-mechanism can also include motor connecting base 3 and spool connecting seat 8, and motor connecting base 3 is fixed by socket in step
The output shaft 14 of stepper motor 1, spool connecting seat 8 are socketed on the first end of spool 10 circumferentially fixedly；The connecting seat at both ends has
There is an interior protuberance, motor connecting base 3 and spool connecting seat 8 all have male part, outer in one end when 1 positive and negative rotation of stepper motor
Protrusion pushes the interior protuberance circumferential movement with end along the direction for increasing pretightning force, to act on connecting seat, and is made by connecting seat
It obtains torsional spring 5 to continue to reverse along the direction for increasing pretightning force, and obtains the torsion of bigger, for pushing spool 10 in stepper motor 1
It is resetted after dead electricity.
For ease of distinguishing, the first interior protuberance 19 will be positioned as set on the interior protuberance of the first connecting seat 4, the second connection will be set to
The interior protuberance of seat 7 is defined as the second interior protuberance 20, will be defined as the first male part 21 set on the male part of motor connecting base 3, if
It is defined as the second male part 22 in the male part of spool connecting seat 8.The output shaft 14 of stepper motor 1 by motor connecting base 3 with
First connecting seat 4 acts on one end of torsional spring 5, and spool 10 acts on torsional spring 5 by means of spool connecting seat 8 and the second connecting seat 7.
In initial position, motor connecting base 3 is with the first male part 21 and the first interior protuberance 19 of the first connecting seat 4 in circumferential direction
Upper abutting, but power can not be acted, spool connecting seat 8 is with the second interior protuberance of the second male part 22 and the second connecting seat 7
20 can also abut without acting power, as shown in Figures 2 and 3 in the circumferential.Also, the first male part 21 is in first
The counter clockwise direction of protrusion 19, the second male part 22 are in the clockwise direction of the second interior protuberance 20, so as in follow-up effect
Torsional spring 5 is reversed in circumferentially opposed both direction.
Below in conjunction with Fig. 4-Fig. 9, the action process of servo valve is illustrated, in order to those skilled in the art understand that originally
Invention.
When initial position, each part position of servo valve is as shown in Figure 1-Figure 3, and the position of each hydraulic fluid port is, oil inlet P and the
One actuator port A and the second actuator port B is in cut-off state, and the first actuator port A and the second actuator port B are and oil return
Mouth T is in cut-off state.
In the first operative state, as shown in Figure 4-Figure 6, after servo valve is by pulse signal, direction is square counterclockwise
When to (being defined as forward direction counterclockwise in the present embodiment, will be defined as clockwise reversed), the output shaft 14 of stepper motor 1 drives
8 synchronous rotary of shaft coupling 6, motor connecting base 3 and spool connecting seat, band 10 synchronous rotary of movable valve plug, spool 10 by its second
The helicitic texture at end is with respect to the screw in an axial direction of valve body 9.When spool 10 moves y1 to right-hand screw in an axial direction relative to valve body 9,
Oil inlet P is communicated with the first actuator port A, and the second actuator port B is communicated with oil return inlet T, and flow area is identical, is S1.
In the process, the state analysis of torsional spring 5 is as follows：
Motor connecting base 3, spool connecting seat 8 rotate counterclockwise with the output shaft 14 of stepper motor 1, since motor connects
First male part 21 of seat 3 is in the counter clockwise direction of the first connecting seat 4, and motor connecting base 3 is circumferentially far from the first connecting seat 4
Movement, therefore the rotation of motor connecting base 3 is by resistance, therefore, the first connecting seat 4 in the case where torsional spring 5 pre-tightens force effect with connect cover 2
The first convex limiting section 17 it is circumferential abut positioning, as shown in Figure 5.Again since the second male part 22 of spool connecting seat 8 is in
The clockwise direction of second connecting seat 7 passes through the circumferential pushing tow of the second male part 22 the when spool connecting seat 8 rotates counterclockwise
Second interior protuberance 20 of two connecting seats 7 drives the second connecting seat 7 that the pretightning force of torsional spring 5 is overcome to continue to rotate, the second connecting seat 7
The twisting resistance is acted on into torsional spring 5 by torque arm 25 so that torsional spring 5 (corresponds to the inverse time towards the direction for increasing pretightning force at the end
Needle direction) further torsion, windup-degree is consistent with the output angle of stepper motor 1, as shown in Figure 6.
The axial stroke y1 of the torque T of torsional spring 5, flow area S1 and screw is calculated according to the following equation at this time
Go out：
T=T1+kX β；
Y1=x β P/2 π；
S1=Ly1.
Wherein, x- umber of pulses, β-stepping angle, the helical pitch of p- spirals, T1- prefastening torques, the elastic stiffness of k- torsional springs 5, L-
Be open interface width.
In a second operative state, as shown in figs. 7 to 9, after servo valve is by pulse signal, direction is along needle direction
When (reversed), the output shaft 14 of stepper motor 1 drives shaft coupling 6,8 synchronous rotary of motor connecting base 3 and spool connecting seat, drives
10 synchronous rotary of spool, spool 10 is by the helicitic texture of its second end with respect to 9 screw in an axial direction of valve body.When 10 phase of spool
When moving y1 to left-hand screw in an axial direction to valve body 9, oil inlet P is communicated with the second actuator port B, the first actuator port A and oil return
Mouth T-phase is logical, and flow area is identical, is S1.
In the process, the state analysis of torsional spring 5 is as follows：
Motor connecting base 3 and spool connecting seat 8 are rotated clockwise with the output shaft 14 of stepper motor 1, since spool connects
Second male part 22 of joint chair 8 is in the clockwise direction of the second connecting seat 7, and spool connecting seat 8 is circumferentially far from the second connection
Seat 7 moves, therefore the rotation of spool connecting seat 8 is by resistance, therefore, the second connecting seat 7 in the case where torsional spring 5 pre-tightens force effect with connect
The second convex limiting section 18 of cover 2 is circumferential to abut positioning, as shown in Figure 9.And at due to the first male part 21 of motor connecting base 3
In the counter clockwise direction of the first connecting seat 4, when motor connecting base 3 rotates clockwise, pass through the circumferential pushing tow of the first male part 21
First interior protuberance 19 of the first connecting seat 4 drives the first connecting seat 4 that the pretightning force of torsional spring 5 is overcome to continue to rotate clockwise, and first
The twisting resistance is acted on torsional spring 5 by connecting seat 4 by torque arm 25 so that torsional spring 5 is towards the direction of increase pretightning force (at the end pair
Should be clockwise) further torsion, windup-degree is consistent with the output angle of stepper motor 1, as shown in Figure 8.
In the process, the axial stroke y1 of torsion spring torque T, flow area S1 and screw work with above-mentioned first
State consistency, except that the direction of motion of y1 is exactly the opposite.
In above-mentioned first working condition and the second working condition, servo valve is not at initial position, but in stepping electricity
Machine 1 it is electric after, being driven to up to new working position by moving clockwise or counterclockwise by stepper motor 1, and work as
After 1 dead electricity of stepper motor, spool connecting seat 8 or motor connecting base 3 can be under the torsion spring torque T effects of torsional spring 5 towards initial bit
The direction set rotates, and band movable valve plug 10 overcomes resistance to do reverse acting spiral movement, and then returns to initial position with movable valve plug 10.In detail
For, in the first operative state, spool connecting seat 8 loses driving force, can push the second connection under torsion spring torque T effects
7 clockwise movements of seat are eventually returned to the second connecting seat 7 with convex positive stop in its second evagination limiting section 24 and the second of connect cover 2
The position that portion 18 circumferentially abuts is returned to the state of Fig. 3 by the state of Fig. 6；In a second operative state, motor connecting base 3 loses
The driving of stepper motor 1 has been gone, 4 counterclockwise movement of the first connecting seat can be pushed under torsion spring torque T effects, finally connected first
Joint chair 4 is pushed to the position that the first evagination limiting section 23 is circumferentially abutted with the first convex limiting section 17, i.e., state is returned as shown in Figure 8
To state shown in Fig. 2.
As it can be seen that in above-mentioned motion process, the output shaft 14 of stepper motor 1 is applied to torsional spring 5 one via motor connecting base 3
A increased pretightning force or the first end of spool 10 are applied to 5 one increased pretightning forces of torsional spring via spool connecting seat 8,
Reset response power as 1 dead electricity back valve core 10 of stepper motor.
Also, in conjunction with the first working condition and the second working condition it is found that spool connecting seat 8, motor connecting base 3, first
Connecting seat 4 and the second connecting seat 7 need certain circumferential movement space.In other words, pre- along increasing when the male part in one end
When the direction circumferential direction pushing tow of clamp force is with the interior protuberance held, the evagination limiting section with end is detached from convex limiting section and keeps not connecing
It touches；Male part in the other end is detached from corresponding interior protuberance and keeps not contacting, the convex limiting section of the other end with it is corresponding
Evagination limiting section be kept in contact.
Specific in the second working condition, the first male part 21 in one end is along the direction circumferential direction pushing tow for increasing pretightning force
When the first interior protuberance 19, push the first evagination limiting section 23 of the first connecting seat 4 and the first convex limiting section 17 of connect cover 2 de-
From contact, also, will not circumferentially be supported with the first convex limiting section 17 with one end in front of the direction of motion during the motion
It connects, i.e., the first connecting seat 4 keeps not contacting after being detached from the first convex limiting section 17 in motion process；And the in the other end
Two male parts 22 are detached from the second interior protuberance 20 and keep not contacting during the motion, outside the second convex limiting section 18 and second
Convex positive stop portion 24 is kept in contact, and is still in the position circumferentially abutted, is consistent with original state, as shown in Figure 8 and Figure 9.
Specific in the first working condition, the first convex limiting section 17 and the first evagination limiting section 23 are kept in contact, and are protected with original state
It holds unanimously, the first interior protuberance 19 is detached from the second interior protuberance 20 and keeps not contacting, and the second male part 22 pushes the second interior protuberance
20 circumferential movements so that the second evagination limiting section 24 and the second convex limiting section 18 of connect cover 2 of the second connecting seat 7 are detached from simultaneously
It keeps not contacting during the motion.
In addition, the output shaft 14 of stepper motor 1 can be fixedly connected by motor connecting base 3 with one end of shaft coupling 6, valve
Core connecting seat 8 can be fixedly connected with the other end of shaft coupling 6, and guide sleeve is arranged in spool connecting seat 8, pass through the guide sleeve
With the axially movable connection of first end of spool 10, and then realize spool 10 and shaft coupling 6 axially movable connection.At this point,
On the one hand, it can be realized by spool connecting seat 8 by the positioning and connection of the output shaft 14 of 3 stepper motor 1 of motor connecting base
The connection and positioning of spool 10, it is particularly possible to the axial movement of spool 10 is oriented to by the guide sleeve of spool connecting seat 8,
Improve motion credibility；Moreover, while the 14 equal effective position of output shaft of spool 10 and stepper motor 1, it can be to shaft coupling
Device 6 is supported positioning.
Also, the first connecting seat 4 and the second connecting seat 7 can all have sleeve part, at this point, torsional spring 5 leans on the portion of two close end
Dividing can be socketed on outside sleeve part, to realize torsional spring 5 in entire axial support.Furthermore the first connecting seat 4 and the second connecting seat
There can be axial gap between 7 sleeve part, so that torsional spring 5 has certain axial deformation space, adapt to fit clearance, keep away
Exempt from stuck.
On the basis of the above, 12 nut structure of leading screw may be used and realize that the second end of spool 10 connects with the screw thread of valve body 9
It connects, to realize conversion of motion.
Such as Fig. 1, Fig. 4 and Fig. 7, the second end of spool 10 is fixedly connected with the leading screw 12 being coaxially arranged, and leading screw 12 has
There are the nut set 11 being threadedly coupled with it, nut set 11 to be fixedly connected with valve body 9 so that nut set 11 is circumferentially limited, in turn
Convert circumferentially rotating for leading screw 12 to axial screw, and leading screw 12 is fixedly connected and is coaxially disposed with spool 10, silk
This movement can further be passed to spool 10 by thick stick 12, and spool 10 is finally circumferentially rotated conversion in an axial direction with respect to valve body 9
Screw.
At the same time, can also include for install nut set 11 nut mounting base 13, the one of the nut mounting base 13
End is tightly connected with the one end of valve chamber 11 far from stepper motor 1, that is, is tightly connected the opposite with the second end of spool 10 of valve chamber 11
The same end answered is sealedly connected with end cap 15 in the other end of nut mounting base 13, and end cap 15 is electric by the separate stepping of valve chamber 16
One end of machine 1 covers；Since end cap 15 has vessel, part of the leading screw 12 far from second end can be accommodated by the vessel.
Finally, the both ends of valve chamber 16 are sealed by end cap 15 and connect cover 2 respectively, ensure that the sealing of entire valve body 9 can
By property.
The servo valve of this programme is adjusted by controlling stepper motor 1, and stepper motor 1 can pass through various digital interfaces
It is controlled, realizes digital remote control, and unconventional Analog control.
Servo valve using the present invention, valve core driving force F can be calculated according to the following equation：
F- valve core driving forces, ρ-leading screw efficiency, the torque of T2- stepper motors 1, T- torsion spring torques, p- guide screw lead (i.e. spiral shells
The helical pitch of rotation).
Wherein, it can be 0.9Nm that the torque of stepper motor 1, which is T2 maximums, torsion spring torque T=0.2Nm, leading screw efficiency ρ=
0.85, guide screw lead p=5mm, the maximum value that valve core driving force F is calculated can be 740N or 1170N, when 10 court of spool
It is 740N to maximum value when torsion spring torque direction being overcome to move, is 1170N when resetting maximum value when direction moves towards torsional spring 5,
The active force that spool 10 resets is 200N.
And the maximum thrust of the line motor of conventional high frequency servo valve is not more than 150N, spring restoring force is not more than 50N.
As it can be seen that the driving force of the servo valve of this programme is 3 to 5 times of conventional directly-drive servo valve, and the resistance of motion is small, and other stress are basic
It is identical.
Direct Action Type digital servo valve provided by the present invention is described in detail above.It is used herein specifically a
Principle and implementation of the present invention are described for example, and the explanation of above example is only intended to help to understand the present invention's
Core concept.It should be pointed out that for those skilled in the art, in the premise for not departing from the principle of the invention
Under, it can be with several improvements and modifications are made to the present invention, these improvement and modification also fall into the protection of the claims in the present invention
In range.
Claims (11)
1. Direct Action Type digital servo valve, which is characterized in that including stepper motor (1), shaft coupling (6), valve body (9) and spool
(10), the valve body (9) have axially through valve chamber (16) and be connected to the valve chamber (16) oil return opening (T), oil inlet
Mouthful (P) and at least two actuator ports (A, B), the spool (10) have at least two working positions, for switch and it is described into
The actuator port that hydraulic fluid port (P) is connected to the oil return opening (T)；One end of the shaft coupling (6) and the stepper motor (1)
Output shaft (14) be fixedly connected, the first end of the other end and the spool (10) is circumferentially fixed, axially movable connection, described
The second end of spool (10) is threadedly coupled with the valve body (9) by nut set (11), so as to by the spool (10) with respect to institute
That states valve body (9) circumferentially rotates the screw of conversion in an axial direction, and then switches the working position and realize the continuous tune of flow
Section.
2. Direct Action Type digital servo valve as described in claim 1, which is characterized in that further include resetting-mechanism, for described
The spool (10) is driven to reset after stepper motor (1) dead electricity.
3. Direct Action Type digital servo valve as claimed in claim 2, which is characterized in that further include connect cover (2), the connect cover
(2) both ends are tightly connected with one end of the output end of the stepper motor (1) and the valve chamber (16) respectively, the shaft coupling
(6) it is placed in the connect cover (2), the output shaft (14) of the stepper motor (1) and the first end difference of the spool (10)
It is stretched into the connect cover (2) by axial both ends, to be connect respectively with the both ends of the shaft coupling (6).
4. Direct Action Type digital servo valve as claimed in claim 3, which is characterized in that the resetting-mechanism include torsional spring (5) and
The connecting seat being fixedly connected with the both ends of the torsional spring (5), there are two the convexes of axially opposing setting to limit for connect cover (2) tool
Position portion；When stepper motor (1) positive and negative rotation, the output shaft (14) of the stepper motor (1) and the first of the spool (10)
One of end pushes the connecting seat circumferential movement with end, the connecting seat of the other end to be circumferentially connected to the other end
The convex limiting section generates the spring force of reset to reverse the torsional spring (5).
5. Direct Action Type digital servo valve as claimed in claim 4, which is characterized in that the resetting-mechanism further includes motor connection
Seat (3) and spool connecting seat (8), the motor connecting base (3) are fixed by socket the output shaft (14) in the stepper motor (1),
The spool connecting seat (8) is socketed on the first end of the spool (10) circumferentially fixedly；The connecting seat at both ends all has
Interior protuberance, the motor connecting base (3) and the spool connecting seat (8) all have circumferentially to be supported with the interior protuberance respectively with end
Push up the male part of cooperation.
6. the digital servo valve of direct acting as claimed in claim 5, which is characterized in that the connecting seat at both ends all has evagination
Limiting section, when the spool (10) is in initial position, the evagination limiting section and the convex limiting section respectively with end are all
To abutting, and the circumferential abutting force at both ends is on the contrary, to pre-tighten the torsional spring (5)；When stepper motor (1) positive and negative rotation, push
The connecting seat of one end is detached from the convex limiting section abutted, and then along the direction circumferential movement for increasing pretightning force.
7. Direct Action Type digital servo valve as claimed in claim 6, which is characterized in that the male part in one end pushes same
When the interior protuberance at end, the evagination limiting section with end is detached from the convex limiting section and keeps not contacting；In another
The male part of one end is detached from the corresponding interior protuberance and keeps not contacting, the convex limiting section and the phase of the other end
The evagination limiting section answered is kept in contact.
8. Direct Action Type digital servo valve as claimed in claim 5, which is characterized in that the output shaft of the stepper motor (1)
(14) it is fixedly connected with one end of the shaft coupling (6) by the motor connecting base (3), the spool connecting seat (8) and institute
The other end for stating shaft coupling (6) is fixedly connected, and the spool connecting seat (8) has guide sleeve, the guide sleeve and the spool
(10) the axially movable connection of first end.
9. Direct Action Type digital servo valve as claimed in claim 4, which is characterized in that the connecting seat has sleeve part, described
Torsional spring (5) is socketed on outside the sleeve part, has axial gap between the sleeve part of the connecting seat in both ends.
10. such as claim 1-9 any one of them Direct Action Type digital servo valves, which is characterized in that the nut set (11) with
The valve body (9) is fixedly connected, the second end of the spool (10) be fixedly connected with coaxially setting and with the nut set
(11) leading screw (12) coordinated.
11. Direct Action Type digital servo valve as claimed in claim 10, which is characterized in that further include for installing the nut set
(11) nut mounting base (13), one end and the separate stepper motor of the valve chamber (16) of the nut mounting base (13)
(1) one end is tightly connected, and the other end is sealedly connected with the end cap (15) with vessel, and the vessel is for accommodating the leading screw
(12) part far from the second end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810922805.XA CN108757622A (en) | 2018-08-14 | 2018-08-14 | Direct Action Type digital servo valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810922805.XA CN108757622A (en) | 2018-08-14 | 2018-08-14 | Direct Action Type digital servo valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108757622A true CN108757622A (en) | 2018-11-06 |
Family
ID=63970042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810922805.XA Pending CN108757622A (en) | 2018-08-14 | 2018-08-14 | Direct Action Type digital servo valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108757622A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112060670A (en) * | 2020-08-13 | 2020-12-11 | 邵玉刚 | Flow and pressure control device of hydraulic machine |
| CN113027846A (en) * | 2021-03-15 | 2021-06-25 | 同济大学 | Synchronous-acting shaft flow distribution switch reversing multi-way valve |
| CN114576402A (en) * | 2022-03-18 | 2022-06-03 | 衢州学院 | Rotary valve type overflow valve with wide pressure regulating range and strong pollution resistance |
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| CN107989991A (en) * | 2017-11-29 | 2018-05-04 | 北京理工大学 | A kind of bidirectional slide valve type electro-hydraulic proportional reducing valve |
| CN208831364U (en) * | 2018-08-14 | 2019-05-07 | 三河沃达液压控制系统有限公司 | Direct Action Type digital servo valve |
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| US4503888A (en) * | 1983-10-04 | 1985-03-12 | Mts Systems Corporation | Servovalve spool control for digital rotary servovalve |
| JPH0754811A (en) * | 1993-08-17 | 1995-02-28 | Mitsubishi Heavy Ind Ltd | Fluid pressure servo valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112060670A (en) * | 2020-08-13 | 2020-12-11 | 邵玉刚 | Flow and pressure control device of hydraulic machine |
| CN113027846A (en) * | 2021-03-15 | 2021-06-25 | 同济大学 | Synchronous-acting shaft flow distribution switch reversing multi-way valve |
| CN114576402A (en) * | 2022-03-18 | 2022-06-03 | 衢州学院 | Rotary valve type overflow valve with wide pressure regulating range and strong pollution resistance |
| CN114576402B (en) * | 2022-03-18 | 2023-04-28 | 衢州学院 | Jiang Zhuaifa overflow valve with wide pressure regulating range and pollution resistance |
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