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Piezoelectric ceramic direct-driving servo valve based on hydraulic micro-displacement amplification structure

A piezoelectric ceramic and hydraulic amplification technology, applied in servo motor components, fluid pressure actuating devices, mechanical equipment, etc., can solve the problems of small output displacement and large output force of piezoelectric ceramic drives, and solve the contradiction between stiffness and strength , Improve the output capacity, the effect of low machining accuracy

Inactive Publication Date: 2013-04-03
BEIHANG UNIV
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Problems solved by technology

[0003] In order to solve the problems existing in the operation of the existing servo valve, the present invention designs a hydraulic micro-displacement amplification structure for the characteristics of

Method used

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  • Piezoelectric ceramic direct-driving servo valve based on hydraulic micro-displacement amplification structure
  • Piezoelectric ceramic direct-driving servo valve based on hydraulic micro-displacement amplification structure
  • Piezoelectric ceramic direct-driving servo valve based on hydraulic micro-displacement amplification structure

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[0018] The hydraulic micro-displacement amplifying piezoelectric ceramic direct drive valve of the present invention will be further described in detail below with reference to the drawings and examples.

[0019] The present invention designs a piezoelectric ceramic direct drive valve based on a hydraulic micro-displacement amplifying structure. The structure diagram is as follows figure 1 As shown, the servo valve mainly includes four parts: eddy current displacement sensor, power slide valve, hydraulic micro-displacement amplifying structure and piezoelectric ceramics.

[0020] figure 1 Among them, piezoelectric ceramic drives the large-area piston movement of the hydraulic micro-displacement amplification structure, and obtains an amplified displacement output proportional to the area ratio on the small-area piston, and drives the power slide valve spool to move. There is an eddy current displacement sensor at the other end of the power spool valve, which is used to collect the p...

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Abstract

The invention belongs to the technical field of the hydraulic pneumatic servo control, and discloses a piezoelectric ceramic direct-driving servo valve based on a hydraulic micro-displacement amplification structure. Piezoelectric ceramic drives a big piston with a hydraulic micro-displacement amplification structure, and an amplified displacement output is obtained on a small piston so as to push the valve plug of a slide valve to move. Compared with the traditional electro-hydraulic servo valve, the piezoelectric ceramic direct-driving servo valve has the advantages that the defect of small output displacement of the traditional piezoelectric ceramic material is overcome due to the displacement amplification action so as to conveniently manufacture a big-flow servo valve; due to the diaphragm-type big position design, the influence on the input displacement and the dynamic response speed of a piezoelectric ceramic driver by the big-mass and big-inertia load of the traditional piston is avoided; the diaphragm-type piston has the advantages of small inertia, high inherent frequency and high dynamic performance; due to the design of an elliptic flexible hinge diaphragm, the intensity requirement and the rigidity requirement are simultaneously guaranteed; and the small piston and the valve plug are not fixedly connected, the coaxiality is easy to guarantee, and the phenomena of rubbing and clamping due to the coaxiality problem of a fixedly-connected structure are avoided.

Description

technical field [0001] The invention belongs to the technical field of hydraulic and pneumatic servo control, and relates to a novel piezoelectric ceramic direct-drive servo valve based on a hydraulic micro-displacement amplification structure. Background technique [0002] Electro-hydraulic servo system plays a pivotal and irreplaceable role in aviation, aerospace, industry and national defense applications. As the core control element in the electro-hydraulic servo system, the electro-hydraulic servo valve has a great influence on the performance and reliability of the entire servo system. Traditional pilot-stage servo valves are difficult to achieve high dynamic response, and require high oil cleanliness. The existing piezoelectric ceramic direct drive servo valve generally has a small valve core displacement and a small control flow rate, which is difficult to meet the requirements of practical applications. Contents of the invention [0003] In order to solve the pr...

Claims

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Application Information

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IPC IPC(8): F15B13/02
Inventor 俞军涛焦宗夏吴帅
Owner BEIHANG UNIV
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