CN218863394U - High-frequency deflection plate jet flow servo valve based on piezoelectric drive and variable cross-section beam deflection - Google Patents
High-frequency deflection plate jet flow servo valve based on piezoelectric drive and variable cross-section beam deflection Download PDFInfo
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- CN218863394U CN218863394U CN202223003176.1U CN202223003176U CN218863394U CN 218863394 U CN218863394 U CN 218863394U CN 202223003176 U CN202223003176 U CN 202223003176U CN 218863394 U CN218863394 U CN 218863394U
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Abstract
The application provides a high frequency deflector plate efflux servovalve based on piezoelectricity drive and variable cross section roof beam flexure includes: a valve body; an upper housing disposed at the valve body; a deflection drive mechanism provided in the upper case; the piezoelectric stack is arranged between the upper shell and the deflection driving mechanism, and can push the deflection driving mechanism to generate angular displacement under the action of voltage; a fluidic assembly disposed inside the upper housing; the reaction rod is provided with a V-shaped groove, the reaction rod can penetrate through the jet flow assembly, one end of the reaction rod is connected with the valve core, and the other end of the reaction rod is connected with the deflection driving mechanism; the servo valve has the advantages that the prestage is driven by the piezoelectric ceramics, the output force of the piezoelectric ceramics is large, the frequency response of the deflection plate electro-hydraulic servo valve is promoted, and the use bandwidth of the servo valve is further increased.
Description
Technical Field
The application belongs to the technical field of electro-hydraulic servo valves, and particularly relates to a high-frequency deflection plate jet flow servo valve based on piezoelectric drive and deflection of a variable cross-section beam.
Background
Compared with the traditional nozzle baffle type electro-hydraulic servo valve, the deflection plate jet flow servo valve has the advantages of high pollution resistance, high reliability and the like, is gradually the mainstream of the electro-hydraulic servo valve at present, and is widely applied to high precision fields such as aviation, aerospace and the like.
Typical deflection plate jet flow servo valves use an electromagnetic torque motor to drive an armature assembly to rotate, and the armature assembly pushes a deflection plate to move to generate jet level pressure difference, so that a valve core is driven to move, and pressure and flow output of the servo valve is formed. The air gap of the torque motor structure is a key factor for ensuring the performance of the jet servo valve of the deflector, the size of the air gap is ensured to be within the design range, and the sizes of a plurality of air gaps are ensured to have good consistency, so that high requirements are provided for the assembly and adjustment process of a product; the design of a small air gap of the magnetic valve easily causes the condition that the armature adsorbs a magnetizer, so that the pole of the servo valve is deviated, and the risk is caused to the working reliability of a servo system.
On the other hand, with the rapid development of aerospace technology and intelligent materials, the bandwidth, response speed and control accuracy of an electro-hydraulic servo valve using an electromagnetic torque motor as a driver cannot meet the application requirements of many fields. Therefore, the use of smart materials to achieve precision actuation of the servo valve prestage has become an alternative to conventional torque motors.
SUMMERY OF THE UTILITY MODEL
In view of the above technical problem, the present application provides a high frequency deflector jet servo valve based on piezoelectric drive and variable cross-section beam flexure, including:
a valve body;
an upper housing provided at the valve body;
a deflection drive mechanism provided in the upper case;
the piezoelectric stack is arranged between the upper shell and the deflection driving mechanism, and can push the deflection driving mechanism to generate angular displacement under the action of voltage;
a fluidic assembly disposed inside the upper housing;
and the reaction rod is provided with a V-shaped groove and can penetrate through the jet assembly, one end of the reaction rod is connected with the valve core, and the other end of the reaction rod is connected with the deflection driving mechanism.
Preferably, the method further comprises the following steps:
and the outer cover is arranged on the valve body and used for protecting the piezoelectric prestage structure.
Preferably, the yaw driving mechanism includes:
a mass block;
the rigid sections are arranged at two ends of the mass block;
the stiff end, the one end of stiff end with rigid section is connected, and the other end is fixed to be set up go up the casing.
Preferably, a square groove is formed in the upper shell, and the square groove is used for mounting the piezoelectric stack.
Preferably, the rigid segments comprise a first rigid segment and a second rigid segment; the piezoelectric stack includes:
one end of the first piezoelectric stack is arranged in the square groove, and the other end of the first piezoelectric stack is connected with the first rigid section;
and one end of the second piezoelectric stack is arranged in the square groove, and the other end of the second piezoelectric stack is connected with the second rigid section.
Preferably, the yaw drive mechanism comprises a variable section beam structure.
The beneficial technical effect of this application:
the high-frequency deflection plate jet flow servo valve based on piezoelectric drive and variable cross-section beam deflection is high in frequency response and good in dynamic performance; the structure is simple, and the installation and adjustment are easy; the reliability is high.
Drawings
FIG. 1 is a schematic structural diagram of a high-frequency deflector jet servo valve provided in an embodiment of the present application;
fig. 2 is a schematic diagram of a piezoelectric prestage driving structure according to an embodiment of the present disclosure;
FIG. 3 is a block diagram of a yaw drive mechanism provided in an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating the operation of a yaw drive mechanism provided in an embodiment of the present application;
wherein: 1-a sensor; 2-a valve body; 3-valve housing; 4-valve core, 5-first piezoelectric stack; 6-a spring tube; 7-a deflection drive mechanism; 8-a second piezoelectric stack; 9-a fluidic component; 10-a housing; 11-right end cap; 12-spool plug; 13-a reaction bar; 14-upper shell.
Detailed Description
Referring to fig. 1-4, the present application provides a high frequency deflector plate jet servo valve based on piezoelectric actuation and variable cross-section beam deflection.
The application provides a high frequency deflector efflux servovalve based on piezoelectricity drive and deflection of variable cross section roof beam, including sensor 1, valve body 2, valve barrel 3, case 4, first piezoelectric stack 5, spring tube 6, deflection drive structure 7, second piezoelectric stack 8, fluidic subassembly 9, dustcoat 10, right-hand member lid 11, case end cap 12, reaction bar 13, go up casing 14.
The first piezoelectric stack 5 and the second piezoelectric stack 8 are symmetrically assembled between the square groove on the upper surface of the upper shell 14 and the deflection driving mechanism 7; the deflection driving mechanism 7 is designed based on a variable cross-section beam, and comprises a middle mass block 7-2, a rigid section 7-1 connected with the mass block 7-2 through a rectangular flexible hinge, fixed ends 7-3 positioned at the left end and the right end, and a flexible hinge for connecting the fixed ends 7-3 and the rigid section 7-1; the fixed end 7-3 and the spring tube 6 are both arranged on the upper shell 14 through screws; the upper shell 14 is internally provided with a jet flow assembly 9 which forms a jet flow structure with the V-shaped groove of the counter-force rod 13; the left end of the valve body 2 is connected with the sensor 1; the valve sleeve 3 and the valve core 4 are arranged inside the valve body 2, and the upper shell 14 is arranged on the upper surface of the valve body 2 through screws; the top end of the counter-force rod 13 is respectively connected with the central holes of the spring tube 6 and the mass block 7-2 through pressing, and the other end of the counter-force rod 13 extends into the valve body 2 through a round hole and is connected with the valve core 4; the housing 10 is mounted on the valve body 2.
It should be noted that, based on the operating principle of the high-frequency deflection plate jet servo valve of piezoelectric drive and deflection of the variable cross-section beam, when the first piezoelectric stack 5 and the second piezoelectric stack 8 installed in the deflection drive structure 7 are under the action of a pair of voltages with equal magnitude and opposite directions, based on the inverse piezoelectric effect of the piezoelectric material, the piezoelectric stacks generate a pair of displacements with equal magnitude and opposite directions, the first piezoelectric stack 5 and the second piezoelectric stack 8 respectively push the connected fixed end 7-3 to deflect along the extension direction through the flexible hinges, and then drive the mass block 7-1 located in the middle to deflect through the flexible hinges, and the mass block drives the reaction rod 13 to rotate, so as to form the relative displacement between the reaction rod 14 and the jet assembly 9, generate jet-level pressure difference, and drive the valve core 4 to move; meanwhile, the reaction rod 13 is matched with the valve core 4 to convert the displacement of the valve core into elastic force which is fed back to the piezoelectric driving prestage structure to form a hydraulic loop of the electro-hydraulic servo valve, so that the control precision and stability of the servo valve are ensured; the sensor 1 is used for monitoring the displacement of the valve core, achieves the aim of monitoring the working state of the servo valve and can also be used for closed-loop control of an electric signal of the servo valve.
Specifically, the pre-stage of the servo valve is driven by piezoelectric ceramics, the output force of the piezoelectric ceramics is large, the frequency response of the deflection plate electro-hydraulic servo valve is promoted, and the use bandwidth of the servo valve is further increased. The motor air gap adjusting link is eliminated, the servo valve installation and adjustment difficulty is reduced, and the product quality control is facilitated. The traditional electromagnetic torque motor structure is replaced, and the risk that the armature is adsorbed on the permanent magnet is avoided. The piezoelectric deflection driving mechanism realizes amplification of output micro-displacement of the piezoelectric stack based on deflection of the variable-section beam. The piezoelectric deflection driving mechanism is driven based on piezoelectric ceramics, has no electromagnetic interference and high resolution, is designed based on the flexible hinge, has no transmission gap and improves the control precision.
The high-frequency deflection plate jet flow servo valve based on piezoelectric drive and variable cross-section beam deflection is high in frequency response and good in dynamic performance; the structure is simple, and the installation and adjustment are easy; the reliability is high.
In other embodiments of the present application, specifically as shown in fig. 1 and fig. 2, a high-frequency deflection plate jet servo valve based on piezoelectric actuation and variable cross-section beam deflection provided by the present application includes a sensor 1, a valve body 2, a valve sleeve 3, a valve core 4, a first piezoelectric stack 5, a spring tube 6, a deflection actuating structure 7, a second piezoelectric stack 8, a jet assembly 9, an outer cover 10, a right end cover 11, a valve core plug 12, a reaction rod 13, and an upper housing 14.
The first piezoelectric stack 5 and the second piezoelectric stack 8 are symmetrically assembled between the square groove on the upper surface of the upper shell 14 and the deflection driving mechanism 7; the deflection driving mechanism 7 is designed based on a variable cross-section beam, and comprises a middle mass block 7-2, a rigid section 7-1 connected with the mass block 7-2 through a rectangular flexible hinge, fixed ends 7-3 positioned at the left end and the right end, and a flexible hinge for connecting the fixed ends 7-3 and the rigid section 7-1; the fixed end 7-3 and the spring tube 6 are both arranged on the upper shell 14 through screws; the upper shell 14 is internally provided with a jet flow assembly 9 which forms a jet flow structure with a V-shaped groove of the counter-force rod 13; the left end of the valve body 2 is connected with the sensor 1; the valve sleeve 3 and the valve core 4 are arranged inside the valve body 2, and the upper shell 14 is arranged on the upper surface of the valve body 2 through screws; the top end of the counter-force rod 13 is respectively connected with the central holes of the spring tube 6 and the mass block 7-2 through pressing, and the other end of the counter-force rod 13 extends into the valve body 2 through a round hole and is connected with the valve core 4; the housing 10 is mounted on the valve body 2.
According to the working principle of the high-frequency deflection plate jet servo valve based on piezoelectric driving and deflection of the variable cross-section beam, when a first piezoelectric stack 5 and a second piezoelectric stack 8 which are installed in a deflection driving structure 7 are under the action of a pair of voltages with equal size and opposite directions, based on the inverse piezoelectric effect of a piezoelectric material, the piezoelectric stacks generate a pair of displacements with equal size and opposite directions, the first piezoelectric stack 5 and the second piezoelectric stack 8 respectively push a connected fixed end 7-3 to deflect along the extension direction through a flexible hinge, and then the mass block 7-1 in the middle is driven to deflect through the flexible hinge. As shown in fig. 4, when displacement in the axial direction of the piezoelectric stack of δ 1 occurs by driving the piezoelectric stack, displacement of δ 2 occurs approximately at the end of the rigid segment. The deflection angle α of the intermediate mass 7-2 with the reaction rod can be approximated as:
thereby forming the relative displacement between the reaction rod 13 and the jet assembly 9, generating jet-level pressure difference and driving the valve core 4 to move; meanwhile, the reaction rod 13 is matched with the valve core 4 to convert the displacement of the valve core into elastic force which is fed back to the piezoelectric driving prestage structure to form a hydraulic loop of the electro-hydraulic servo valve, so that the control precision and stability of the servo valve are ensured; the sensor 1 is used for monitoring the displacement of the valve core, achieves the aim of monitoring the working state of the servo valve and can also be used for closed-loop control of an electric signal of the servo valve.
The servo valve has the advantages that the prestage is driven by the piezoelectric ceramics, the output force of the piezoelectric ceramics is large, the frequency response of the deflection plate electro-hydraulic servo valve is promoted, and the use bandwidth of the servo valve is further increased. The motor air gap adjusting link is eliminated, the servo valve installation and adjustment difficulty is reduced, and the product quality control is facilitated. The piezoelectric deflection driving mechanism is driven based on piezoelectric ceramics, does not have electromagnetic interference, is high in resolution, is designed based on the flexible hinge, does not have a transmission gap, and improves control precision.
Claims (6)
1. A high frequency deflector plate jet servo valve based on piezoelectric actuation and variable cross-section beam deflection, comprising:
a valve body;
an upper housing disposed at the valve body;
a deflection drive mechanism provided in the upper case;
the piezoelectric stack is arranged between the upper shell and the deflection driving mechanism, and can push the deflection driving mechanism to generate angular displacement under the action of voltage;
a fluidic assembly disposed inside the upper housing;
and the reaction rod is provided with a V-shaped groove and can penetrate through the jet assembly, one end of the reaction rod is connected with the valve core, and the other end of the reaction rod is connected with the deflection driving mechanism.
2. A piezoelectric drive and variable cross-section beam deflection based high frequency deflector plate jet servo valve as claimed in claim 1 further comprising:
and the outer cover is arranged on the valve body and used for protecting the piezoelectric prestage structure.
3. A piezoelectric drive and variable cross-section beam deflection based high frequency deflector plate jet servo valve as claimed in claim 1 wherein said deflection drive mechanism comprises:
a mass block;
the rigid sections are arranged at two ends of the mass block;
the stiff end, the one end of stiff end with rigid section is connected, and the other end is fixed to be set up go up the casing.
4. A high frequency deflector jet servo valve based on piezo-electric drive and variable cross-section beam flexure as claimed in claim 3 wherein the upper housing is provided with a square slot for mounting the piezo-electric stack.
5. The piezoelectric drive and variable cross-section beam deflection based high frequency deflector plate jet servo valve of claim 4, wherein the rigid section comprises a first rigid section and a second rigid section; the piezoelectric stack includes:
one end of the first piezoelectric stack is arranged in the square groove, and the other end of the first piezoelectric stack is connected with the first rigid section;
and one end of the second piezoelectric stack is arranged in the square groove, and the other end of the second piezoelectric stack is connected with the second rigid section.
6. A piezoelectric drive and variable cross-section beam deflection based high frequency deflector plate jet servo valve as claimed in claim 3 wherein the deflection drive mechanism comprises a variable cross-section beam structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223003176.1U CN218863394U (en) | 2022-11-11 | 2022-11-11 | High-frequency deflection plate jet flow servo valve based on piezoelectric drive and variable cross-section beam deflection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223003176.1U CN218863394U (en) | 2022-11-11 | 2022-11-11 | High-frequency deflection plate jet flow servo valve based on piezoelectric drive and variable cross-section beam deflection |
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| Publication Number | Publication Date |
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| CN218863394U true CN218863394U (en) | 2023-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223003176.1U Active CN218863394U (en) | 2022-11-11 | 2022-11-11 | High-frequency deflection plate jet flow servo valve based on piezoelectric drive and variable cross-section beam deflection |
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| Country | Link |
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| CN (1) | CN218863394U (en) |
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