CN116517906A - Servo valve pilot structure based on bilateral intelligent materials - Google Patents

Servo valve pilot structure based on bilateral intelligent materials Download PDF

Info

Publication number
CN116517906A
CN116517906A CN202310737813.8A CN202310737813A CN116517906A CN 116517906 A CN116517906 A CN 116517906A CN 202310737813 A CN202310737813 A CN 202310737813A CN 116517906 A CN116517906 A CN 116517906A
Authority
CN
China
Prior art keywords
flexible hinge
hole
servo valve
pilot structure
actuators
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310737813.8A
Other languages
Chinese (zh)
Inventor
徐远志
焦宗夏
欧智钧
吴楚君
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beihang University
Ningbo Institute of Innovation of Beihang University
Original Assignee
Beihang University
Ningbo Institute of Innovation of Beihang University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beihang University, Ningbo Institute of Innovation of Beihang University filed Critical Beihang University
Priority to CN202310737813.8A priority Critical patent/CN116517906A/en
Publication of CN116517906A publication Critical patent/CN116517906A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • F15B13/021—Valves for interconnecting the fluid chambers of an actuator
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/004—Actuating devices; Operating means; Releasing devices actuated by piezoelectric means
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
    • F16K31/40—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor

Abstract

The invention discloses a servo valve pilot structure based on a bilateral intelligent material, which comprises a substrate, wherein a containing cavity is arranged on the substrate; the first end of the flexible hinge is fixedly connected with the base body, and the second end of the flexible hinge is positioned in the accommodating cavity; the two actuators are oppositely arranged at two sides of the base body, the actuating ends of the two actuators are positioned in the accommodating cavity, and the actuating ends of the two actuators are abutted against the second ends of the flexible hinges from the two opposite sides; the pressure distribution part is fixedly connected with the second end of the flexible hinge at one end; the pressure distribution part is used for deflecting under the action of pressure difference of the two actuators so as to realize state switching. The invention can improve the performance of a large hydraulic pipeline system with high working pressure. The hydraulic control system is arranged in a hydraulic pipeline system to realize the functions of flow control, fluid pulsation suppression, hydraulic system noise suppression and the like of the pipeline system.

Description

Servo valve pilot structure based on bilateral intelligent materials
Technical Field
The invention relates to the technical field of servo control of fluid mechanical devices, in particular to a servo valve pilot structure based on bilateral intelligent materials.
Background
In conventional fluid-mechanical systems, and in particular in engineering hydraulic line systems, electrohydraulic servo valves are used as key elements for controlling hydraulic energy sources, which have the function of converting relatively low-power electrical signals into hydraulic power for driving large mechanical structures. Electro-hydraulic servo valves, particularly high-frequency servo valves, play a significant role in the fields of flow control of hydraulic pipeline systems, fluid pulsation suppression, noise suppression of hydraulic systems and the like.
In recent years, the use of smart materials in the field of fluid machinery has received a great deal of attention. Particularly, piezoelectric ceramics, giant magnetostrictive materials and the like become research hot spots of high-frequency servo valve driving structures because of the advantages of fast frequency response, high control precision and the like. At present, a main driving structure of a jet pipe servo valve in a high-frequency servo valve is a driven electromagnetic torque motor, and the electromagnetic torque motor drives a magnetic field armature structure to float by controlling current of a coil magnetic group, so that the jet pipe structure is driven to realize micro-angle rotation.
At present, the frequency response of a servo valve pilot structure of a jet pipe based on bilateral intelligent materials is only 400Hz at most, and the frequency response of the pilot structure of a nozzle baffle valve is 600Hz at most and does not exceed 800Hz.
How to further increase the frequency response of the pilot structure is one of the important issues to be addressed in the art.
Disclosure of Invention
The invention aims to provide a servo valve pilot structure based on a bilateral intelligent material, which solves the defects in the prior art and can further improve the frequency response of the pilot structure. The performance of a large hydraulic line system at high operating pressures can be improved. The hydraulic control system is arranged in a hydraulic pipeline system to realize the functions of flow control, fluid pulsation suppression, hydraulic system noise suppression and the like of the pipeline system.
The invention provides a servo valve pilot structure based on double-sided intelligent materials, which comprises,
the base body is provided with a containing cavity;
the first end of the flexible hinge is fixedly connected with the base body, and the second end of the flexible hinge is positioned in the accommodating cavity;
the two actuators are oppositely arranged at two sides of the base body, the actuating ends of the two actuators are positioned in the accommodating cavity, and the actuating ends of the two actuators are abutted against the second ends of the flexible hinges from the two opposite sides;
the pressure distribution part is fixedly connected with the second end of the flexible hinge at one end; the pressure distribution part is used for deflecting under the action of pressure difference of the two actuators so as to realize state switching.
The servo valve pilot structure based on the double-sided intelligent material, wherein optionally, the pressure distributing part has at least three states:
in a first state, the second end of the flexible hinge deflects towards a first direction under the combined action of the two actuators;
in a second state, the second end of the flexible hinge deflects towards a second direction under the combined action of the two actuators; the first direction is opposite to the second direction;
in a third state, when the second end of the flexible hinge is not acted by the actuators or the forces of the two actuators are equal in magnitude and opposite in direction, the second end of the flexible hinge is in a balance position between the first state and the second state.
The servo valve pilot structure based on the bilateral intelligent materials, as described above, wherein optionally, the substrate is provided with a first through hole and a second through hole;
the first through hole and the second through hole are communicated with the accommodating cavity and are respectively positioned on two opposite sides of the substrate; the center line of the first through hole and the center line of the second through hole are positioned on the same straight line.
The servo valve pilot structure based on the bilateral intelligent materials, wherein optionally, a third through hole is further formed in the substrate;
the pressure distribution piece passes through the third through hole, and one end of the pressure distribution piece, which is far away from the flexible hinge, is positioned outside the base body;
the center line of the first through hole and the center line of the second through hole are perpendicular to the straight line where the center line of the third through hole is located.
The servo valve pilot structure based on the double-sided intelligent material, wherein optionally, a sealing element is arranged between the pressure distributing part and the third through hole.
The servo valve pilot structure based on the double-sided intelligent material, wherein optionally, one end of the actuating end, which is abutted against the flexible hinge, is provided with a bulge, and the bulge is of a part spherical structure.
The servo valve pilot structure based on the double-sided intelligent material, wherein the pressure distributing component is a jet pipe or a baffle plate.
The servo valve pilot structure based on the bilateral intelligent materials, wherein the actuator is optionally made of piezoelectric ceramics or giant magnetostrictive materials.
The servo valve pilot structure based on the double-sided intelligent material, wherein optionally, the flexible hinge is reduced in size and then increased in size along the direction from the first end to the second end of the flexible hinge in the direction of connecting lines of the two actuating ends.
The servo valve pilot structure based on the double-sided intelligent material, wherein the servo valve pilot structure optionally further comprises a lock nut;
the actuator is in threaded connection with the base body;
the lock nut is in threaded connection with the actuator, and the lock nut abuts against the base body.
Compared with the prior art, the invention has the advantages that the accommodating cavity is arranged in the substrate, the flexible hinge is arranged in the accommodating cavity, and the actuators are arranged at the two sides of the flexible hinge. One end of the pressure distributing member is fixed to the second end of the flexible hinge. By the action of the two actuators on the two sides, the micro elastic angular deformation of the pressure distribution part is realized by utilizing the pressure difference generated by the two actuators. The actuator uses intelligent material, and the flexible hinge is matched, so that the frequency response of the pilot structure can reach thousands of hertz.
In the working process, as the flexible hinge and the double-sided intelligent material are used, a mechanical hard contact mode is adopted, and zero drift phenomenon caused by external environment interference such as temperature change and the like generated by the traditional electromagnetic torque motor through magnetic clearance fit is avoided. And the phenomenon of power failure full rudder fault caused by a single-side actuator is effectively solved by adopting double-side driving.
Drawings
FIG. 1 is a schematic view of a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the present invention.
Reference numerals illustrate:
1-a base body, 2-a flexible hinge, 3-an actuator, 4-a pressure distribution part, 5-a sealing part and 6-a locking nut;
11-a containing cavity, 12-a first through hole, 13-a second through hole and 14-a third through hole;
31-actuation end, 32-protrusion.
Detailed Description
The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the background art, in addition to the already indicated need for further improvement of the frequency response of the pilot structure, the current design of high frequency servo valves has the following drawbacks:
1. the jet pipe servo valve uses the jet pressure distribution principle, and has the advantages of strong pollution resistance, small impact of erosion and abrasion, high reliability and the like. However, because the servo valve based on the traditional electromagnetic torque motor adopts an assembly mode of magnetic levitation type positioning, the servo valve is easy to be interfered by external working environment, such as zero position deviation caused by temperature change, the stability of a magnetic levitation type structure is poor, the driving force of the torque motor is small, and key performance indexes such as output frequency response and control precision of a main valve core are influenced.
2. The direct-drive valve based on intelligent material driving is superior to a two-stage servo valve in frequency response because the hydraulic amplifier is omitted, and dynamic damping caused by the hydraulic amplifier is eliminated. However, the basic principle of the intelligent material direct-drive valve is that an intelligent material drive structure is adopted to directly drive the main valve core, so that the requirement on the self performance of the drive structure is higher, and the larger the output power of the drive structure is required to achieve the purpose of improving the frequency response speed of the main valve core. Therefore, the output flow of the direct-drive valve structure is generally smaller, and the high-pressure and large-flow requirements in a large-scale hydraulic pipeline system are difficult to meet.
3. The pilot stage of the nozzle baffle valve driven by the intelligent material structure adopts a method of controlling the pressure drop of driving hydraulic pressure at two ends of the main valve core by the baffle plate to realize pressure control. In order to control the pressure gain of the servo valve to a controllable range, the pilot stage internal flow passage is generally small, so that the pollution resistance of the nozzle flapper valve is poor. And the valve structure influences the pressure of the nozzles on the left side and the right side under the condition of erosion and abrasion, so that the service life reliability of the nozzle baffle valve is lower.
4. Because of the limitations of the characteristics of the common intelligent materials, such as piezoelectric ceramics, magnetostrictive materials and the like, only push force can be output in one direction, and the tensile load cannot be born. Therefore, the design of using a single-side driver to connect in series the high-performance disc spring can bring about the fault phenomenon of 'power failure full rudder', namely, when the servo valve is disconnected from the input power supply caused by the system fault or the condition that an input signal cannot be acquired and the like, the servo valve can completely deflect the main valve core to one side under the driving of the disc spring, so that the full rudder deflection fault is caused, the load performance of a hydraulic pipeline system can be greatly influenced, and the reliability of the hydraulic pipeline system is greatly influenced.
In order to solve the problems in the background art and to overcome the drawbacks noted in the prior art as described above, the present invention proposes the following embodiments to be solved.
Example 1
Referring to fig. 1, the present embodiment provides a servo valve pilot structure based on a dual-side intelligent material, which includes a base 1, a flexible hinge 2, two actuators 3, and a pressure distribution member 4. The base body 1 is used for supporting the whole structure, the flexible hinge 2 is used for installing the pressure distributing part 4, and the two actuators 3 are used for applying pressure to the flexible hinge 2 from two sides so as to enable the flexible hinge 2 to perform small angular displacement, thereby achieving the purpose of changing the state of the pressure distributing part 4.
Specifically, the base 1 is provided with a containing cavity 11. The housing chamber 11 is used for mounting the flexible hinge 2 and accommodates a part of the pressure distribution member 4 and the actuating end 31 of the actuator 3.
In particular applications, the base 1 is also used to connect with a primary spool structure by threads or other structures at the bottom. The connection between the structure and the main valve core structure can be realized by those skilled in the art in a manner of the prior art, and is not described again.
The first end of the flexible hinge 2 is fixedly connected with the base body 1, and the second end is positioned in the accommodating cavity 11. In particular, for ease of installation, the upper end of the receiving chamber 11 may be provided with an opening, and a first recess may be provided at the opening. The first end of the flexible hinge 2 is positioned with the base 1 by means of the first recess and is connected to the base by means of a welded or interference fit.
The two actuators 3 are oppositely arranged at two sides of the base 1, and the actuating ends 31 of the two actuators 3 are both positioned in the accommodating cavity 11 and are abutted against the second ends of the flexible hinges 2 from two opposite sides. In a specific implementation, the connection manner between the actuator 3 and the base 1 may be an interference fit connection, a clamping connection, welding connection, etc. However, in view of the installation accuracy, the requirement for adjustment in the axial direction of the actuator 3, the requirement for maintenance and disassembly, the requirement for replacement by failure, etc., the base body 1 and the actuator 3 may be installed with a screw connection being preferable. That is, the fine assembly process is achieved by fine adjustment of the threads.
One end of the pressure distributing part 4 is fixedly connected with the second end of the flexible hinge 2; in a specific implementation, the pressure distributing member 4 may be mounted in a second groove below the flexible hinge in an interference fit manner, so that the pressure distributing structure can complete a small-angle reciprocating deflection motion around the rotation center on the flexible hinge. The pressure distribution member 4 is used for deflecting under the action of the pressure difference between the two actuators 3 so as to realize state switching.
When the structure is specifically used, the displacement output performance of the pilot structure is in direct proportion to the output performance of the actuator 3, namely, the larger the output displacement of the output end of the actuator 3 is, the larger the output of the pilot structure is, the larger the output force of the actuator 3 is, the larger the rotation moment for driving the flexible hinge 2 and the pressure distribution part 4 is, and the faster the frequency response of the pilot structure is. Meanwhile, the contact position of the actuator 3 and the flexible hinge 2 is used as a driving input point, the distance between the point and the rotation center is used as an input force arm, the distance between the acting point of the pressure distribution part 4 and the rotation center is used as an output force arm, the displacement output performance of the pressure distribution part is in direct proportion to the ratio of the input force arm to the output force arm, the input force arm is reduced, namely the radius of a notch of the flexible hinge 2 is reduced, or the output force arm is increased, namely the length of the jet pipe is prolonged, and the larger the ratio of the input force arm to the output force arm is, the more obvious the displacement amplification performance of the pilot structure is. Therefore, the main valve core structure is installed on the main valve core structure of the high-frequency response servo valve in a threaded installation connection mode, and the main valve core structure can be adaptive according to the partial structure of the modified base body 1 as a power amplification pilot structure. The pilot structure has the characteristics of compact structure, simple zero adjustment, insensitivity to machining and assembling errors, strong maintainability, quick frequency response and the like. Meanwhile, the output performance of the pilot structure can be quickly changed by changing the specification parameters, the jet pipe length and the like of the intelligent material actuator 3, so that the pilot structure can be quickly adapted to the requirements under the working environment without working conditions, the adaptability to the working scene is realized, and the functions of flow control, fluid pulsation suppression, hydraulic system noise control and the like are realized in different hydraulic pipeline systems.
In practice, the pressure distribution member 4 has at least three states:
in the first state, the second end of the flexible hinge 2 is deflected in a first direction by the combined action of the two actuators 3.
In a second state, the second end of the flexible hinge 2 deflects towards a second direction under the combined action of the two actuators 3; the first direction is opposite to the second direction;
in the third state, when the second end of the flexible hinge 2 is not acted by the actuator 3, or the forces of the two actuators 3 are equal and opposite, the second end of the flexible hinge 2 is in a balance position between the first state and the second state.
Specifically, after the installation is completed, the minimum thickness position in the flexible hinge is used as the rotation center, and since the left actuator 3 and the right actuator 3 are used as components for driving the flexible hinge 2, the flexible hinge 2 is precisely controlled to generate tiny elastic angular deformation around the rotation center by changing the output displacement and the output force of the actuators 3 at two sides. When the output of the left end actuator 3 is larger than that of the right end actuator 3, the structure below the notch of the flexible hinge deflects rightwards around the rotation center under the action of force, so that the pressure distribution part 4 is driven to deflect anticlockwise by a small angle; at this time, the pressure distributing member 4 is in the first state. Conversely, when the output of the left-hand actuator 3 is smaller than that of the right-hand actuator 3, the flexible hinge 2 and the pressure distributing member 4 deflect clockwise around the rotation center. At this time, the pressure distributing member 4 is in the second state. When the actuators 3 at the two ends have no force or the forces are equal and opposite to each other on the flexible hinge 2, the pressure distributing member 4 is in a balance position between the first state and the second state.
In the specific implementation, in order to facilitate the installation of the two actuators 3, the base 1 is provided with a first through hole 12 and a second through hole 13; the first through hole 12 and the second through hole 13 are used for mounting the actuator 3. The first through hole 12 and the second through hole 13 are communicated with the accommodating cavity 11 and are respectively positioned on two opposite sides of the substrate 1; the center line of the first through hole 12 and the center line of the second through hole 13 are positioned on the same straight line.
In order to achieve the effect of the invention, the base 1 is also provided with a third through hole 14; the pressure distributing part 4 passes through the third through hole 14, and one end of the pressure distributing part 4 away from the flexible hinge 2 is positioned outside the base body 1; the center line of the first through hole 12 and the center line of the second through hole 13 are perpendicular to the straight line where the center line of the third through hole 14 is located. In this way, in the third state, the pressure distribution member 4 can be brought to the equilibrium position.
Preferably, a seal 5 is mounted between the pressure distributing member 4 and the third through hole 14. The sealing piece 5 is made of spring materials and is sealed in an interference fit mode, the sealing effect is achieved in a mechanical material surface sealing mode, the fact that high-pressure fluid in the pilot structure and the high-pressure fluid in the outlet cannot leak is guaranteed, and other elements are prevented from being damaged. Since the seal 5 has elasticity, the seal 5 does not affect the deflection of the pressure distribution member 4.
The end of the actuating end 31 abutting against the flexible hinge 2 is provided with a protrusion 32, and the protrusion 32 has a part spherical structure. When the protrusion 32 is in hard contact with the plane of the flexible hinge 2, even if there is a certain processing error and assembly error of the two components, a good output performance can be ensured.
In particular, the actuator 3 is made of a piezoelectric ceramic or a giant magnetostrictive material. That is, the actuator 3 is made of a smart material, and preferably a piezoelectric ceramic or a giant magnetostrictive material in the smart material. Under the drive of the bilateral intelligent material, the frequency response of the pilot structure of the servo valve based on the bilateral intelligent material and the flexible hinge can reach thousands of hertz under the excitation of step signals, while the frequency response of the pilot structure of the servo valve based on the bilateral intelligent material of the current jet pipe is only about 400Hz at most, and the frequency response of the pilot structure of the nozzle baffle valve is 600Hz at most and 800Hz at most, so that the dynamic performance of the servo valve of the jet pipe is far higher than that of the current commercial high-frequency servo valve.
Specifically, the flexible hinge 2 decreases in size and increases in size in the direction of the line connecting the two actuating ends 31 in the direction from the first end to the second end thereof. The minimum dimension in the direction of the connection between the two actuating ends 31 is the rotation center.
In particular, in order to ensure the accuracy of the installation of the actuator 3 and to maintain a certain fine tuning capacity, a lock nut 6 is also included. Specifically, the actuator 3 is in threaded connection with the base 1; the lock nut 6 is in threaded connection with the actuator 3, and the lock nut 6 abuts against the base body 1. The connection mode of bilateral intelligent material actuator and base member is the dead mode of double screw thread lock, when guaranteeing that the actuator can realize certain fine setting ability, compresses tightly the actuator through the elasticity realization of screw thread, and screw thread assembly mode is simpler, and the trouble is changed easily, maintainability is good.
Preferably, in this embodiment, the pressure distributing member 4 may be a jet pipe, and when in the first state or the second state, the jet pipe and the high-pressure fluid in the oil passage deflect counterclockwise by a small angle to cooperate with the main valve core to redistribute pressure. The holding cavity and the jet receiving cavity are separated by means of the sealing piece 5 by means of interference fit.
Example two
The present embodiment is a further improvement based on the first embodiment, and the same points are not described in detail, and only the differences are described below.
Referring to fig. 2, the present embodiment is different from embodiment 1 only in that the pressure distributing member 4 is a baffle, that is, the pressure distribution in the main valve core is achieved by the deflection of the baffle.
Because the pressure distribution part 4 is arranged as a baffle, the base body 1 at two sides of the baffle is respectively provided with an oil duct and a corresponding groove which are matched with the baffle, so as to achieve the purpose of pressure distribution. This can be achieved by a person skilled in the art with reference to fig. 2 and the prior art. And will not be described in detail herein.
Example III
This embodiment is a further description of the first and second embodiments to illustrate the principles and effects thereof.
The high frequency response characteristic of the servo valve pilot structure based on the double-sided smart material will be explained by the following deduction.
Regarding the present invention having high frequency response characteristics, let F be a The difference of the output forces of the bilateral intelligent material actuator is positive to the right, and the distance between the bilateral intelligent material actuator and the flexible hinge is equal to the input force arm I 1 For pressure distribution structures, e.g. jet pipes, baffles, etc., the moment M is input a Is the product of force and arm, namely:
M a ＝F a ·l 1 (1)
the flexible hinge displacement amplifying structure rotates around the rotation center, so that the relation between the rotation of the structure and the output force of the actuator is as follows:
wherein F is a The difference of the output forces of the bilateral intelligent material actuator is positive to the right, and the distance between the bilateral intelligent material actuator and the flexible hinge is equal to the input force arm I 1 J is the rotational inertia of the flexible hinge-jet tube-feedback spring assembly, B is the viscous damping coefficient of the flexible hinge-jet tube-feedback spring assembly, k is the rotational stiffness of the flexible hinge, θ is the rotational angle of the flexible hinge-jet tube-feedback spring assembly, T b To feed back the load moment generated by the elastic deformation of the spring rod.
Based on the research of the field of intelligent materials at present, for example, the output force of a piezoelectric ceramic material can reach thousands of newtons, according to analysis, under the drive of a bilateral intelligent material, the output of a pilot structure is excited by a step signal, the frequency response of a related servo valve pilot structure based on the bilateral intelligent material and based on a flexible hinge 2 and the bilateral intelligent material can reach thousands of hertz, while the frequency response of the current jet pipe based on the servo valve pilot structure of the bilateral intelligent material is only 400Hz at most, the frequency response of the pilot structure of a nozzle baffle valve is 600Hz at most, and the frequency response of the pilot structure of the nozzle baffle valve is 800Hz at most, so that the dynamic performance of the related jet pipe servo valve is far higher than that of the current commercial high-frequency servo valve.
The following description is made regarding the long life characteristic of the present invention.
In the servo valve pilot structure based on the bilateral intelligent materials, the notch position of the flexible hinge 2 is used as a rotation center, and is driven by the high frequency of the intelligent material actuator 3, so that fatigue failure is most likely to occur, and the position is the weakest place in the whole pilot structure.
According to a material mechanics formula, the relation expression of the maximum stress of the flexible hinge and the angular displacement output of the jet pipe is as follows:
σ max the elastic modulus of the material used for the flexible hinge structure is E, R is the radius of an arc incision of the flexible hinge, θ is the corner of the flexible hinge-jet pipe-feedback spring assembly, t is the minimum thickness dimension of the incision of the flexible hinge, s=b/t, and b is the planar thickness of the flexible hinge.
The maximum stress of the flexible hinge 2 is in positive correlation with the elastic modulus of the material, the square of the tangential radius and the angular displacement of the jet pipe, and is inversely proportional to the square of the thickness of the thinnest position of the flexible hinge.
According to the fatigue failure mechanism of the metal material, under the action of an alternating stress load spectrum, in order to ensure that the structure reaches a certain service life, the maximum stress and the alternating stress amplitude of the structure are smaller than the stress limit of response. By changing the material and the related size of the flexible hinge, the maximum stress of the rotation center position of the flexible hinge is reduced, so that the theoretical design life of the pilot structure can be shortened to an infinite life.
The following description is made with respect to the reliability characteristics of the present invention.
The servo valve pilot structure based on the double-sided intelligent material and based on the flexible hinge 2 and the double-sided intelligent material adopts a mechanical hard contact mode, so that zero drift phenomenon caused by external environment interference such as temperature change and the like generated by the traditional electromagnetic torque motor through magnetic clearance fit is avoided. And the phenomenon of power failure full rudder fault caused by a single-side actuator is effectively solved by adopting double-side driving.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Claims (10)

1. A servo valve pilot structure based on double-sided intelligent materials is characterized by comprising,
a base body (1), wherein the base body (1) is provided with a containing cavity (11);
the first end of the flexible hinge (2) is fixedly connected with the base body (1), and the second end of the flexible hinge (2) is positioned in the accommodating cavity (11);
the two actuators (3) are oppositely arranged at two sides of the base body (1), and the actuating ends (31) of the two actuators (3) are both positioned in the accommodating cavity (11) and are abutted against the second ends of the flexible hinges (2) from the two opposite sides;
a pressure distribution member (4), wherein one end of the pressure distribution member (4) is fixedly connected with the second end of the flexible hinge (2); the pressure distribution part (4) is used for deflecting under the action of the pressure difference of the two actuators (3) so as to realize state switching.
2. The servo valve pilot structure based on double-sided smart material according to claim 1, characterized in that the pressure distribution member (4) has at least three states:
in a first state, the second end of the flexible hinge (2) deflects towards a first direction under the combined action of the two actuators (3);
in a second state, the second end of the flexible hinge (2) deflects towards a second direction under the combined action of the two actuators (3); the first direction is opposite to the second direction;
in a third state, when the second end of the flexible hinge (2) is not acted by the actuators (3) or forces of the two actuators (3) are equal and opposite in direction, the second end of the flexible hinge (2) is in a balance position between the first state and the second state.
3. The servo valve pilot structure based on the double-sided intelligent material according to claim 2, wherein the base body (1) is provided with a first through hole (12) and a second through hole (13);
the first through hole (12) and the second through hole (13) are communicated with the accommodating cavity (11) and are respectively positioned on two opposite sides of the base body (1); the center line of the first through hole (12) and the center line of the second through hole (13) are positioned on the same straight line.
4. A servo valve pilot structure based on a bilateral intelligent material according to claim 3, characterized in that the base body (1) is further provided with a third through hole (14);
the pressure distributing part (4) passes through the third through hole (14), and one end of the pressure distributing part (4) away from the flexible hinge (2) is positioned outside the base body (1);
the center line of the first through hole (12) and the center line of the second through hole (13) are perpendicular to the straight line where the center line of the third through hole (14) is located.
5. The servo valve pilot structure based on the double-sided smart material according to claim 4, characterized in that a seal (5) is installed between the pressure distribution member (4) and the third through hole (14).
6. The servo valve pilot structure based on the double-sided intelligent material according to any one of claims 1 to 5, characterized in that one end of the actuating end (31) abutting against the flexible hinge (2) is provided with a protrusion (32), and the protrusion (32) is of a part spherical structure.
7. A servovalve pilot structure based on double sided smart materials according to any of claims 1-5, characterized in that the pressure distribution member (4) is a jet pipe or a baffle.
8. The servo valve pilot structure based on the double-sided smart material according to any one of claims 1-5, characterized in that the actuator (3) is made of piezoelectric ceramics or giant magnetostrictive material.
9. A servo valve pilot structure based on a double sided smart material according to any of claims 1-5, characterized in that the flexible hinge (2) decreases and then increases in size in the direction of the line connecting the two actuating ends (31) in the direction from its first end to its second end.
10. Servo valve pilot structure based on double sided smart material according to any of claims 1-5, further comprising a lock nut (6);
the actuator (3) is in threaded connection with the base body (1);
the lock nut (6) is in threaded connection with the actuator, and the lock nut (6) abuts against the base body (1).
CN202310737813.8A 2023-06-20 2023-06-20 Servo valve pilot structure based on bilateral intelligent materials Pending CN116517906A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310737813.8A CN116517906A (en) 2023-06-20 2023-06-20 Servo valve pilot structure based on bilateral intelligent materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310737813.8A CN116517906A (en) 2023-06-20 2023-06-20 Servo valve pilot structure based on bilateral intelligent materials

Publications (1)

Publication Number Publication Date
CN116517906A true CN116517906A (en) 2023-08-01

Family

ID=87405029

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310737813.8A Pending CN116517906A (en) 2023-06-20 2023-06-20 Servo valve pilot structure based on bilateral intelligent materials

Country Status (1)

Country Link
CN (1) CN116517906A (en)

Similar Documents

Publication Publication Date Title
US3152612A (en) Piezoelectric crystal transducer for controlling fluid flow
US3570806A (en) Balanced electromechanical control valve
US10344885B2 (en) Hydraulic servovalves
JP2007503560A (en) Adjustable pressure supply for variable displacement reversible hydraulic motor
US9971359B2 (en) Controlled three-way proportional valve unit
CA2922818C (en) Combined thermal management unit
CN105556133A (en) Improvements in hydraulic servovalves
CN110805583B (en) Piezoelectric sheet driven nozzle blocking disc pressure servo valve with main valve core hydraulic compensation
CN116517906A (en) Servo valve pilot structure based on bilateral intelligent materials
Bertin et al. An investigation of piezoelectric ring benders and their potential for actuating servo valves
CN110219846B (en) High-speed driving device for two-dimensional valve
EP2686594B1 (en) Improvements in servovalve actuation
US11359741B2 (en) Valve drive and valve
US20200096018A1 (en) Jet-flapper servo valve
EP0012743A1 (en) Piezoelectric control valve
US20210108735A1 (en) Servo valve assembly
US11193510B2 (en) Hydraulic stage
WO2012149902A1 (en) Float-type servo valve
CA2665174A1 (en) Low consumption pneumatic controller
JPS61171907A (en) Electric hydraulic pressure servo valve
EP4083445A1 (en) A magnetic force compensator for a pneumatic positioner
CN112682532B (en) Sliding valve structure for inhibiting large temperature drift function of electro-hydraulic servo valve and adjusting method
RU2064608C1 (en) Servo-actuated valve
US20220196163A1 (en) Valve device, flow rate control method, fluid control device, semiconductor manufacturing method, and semiconductor manufacturing apparatus using the valve device
KR100453993B1 (en) Piezo valve

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination