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Digital hydraulic pump driven by piezoelectric ceramics

A piezoelectric ceramic drive, digital hydraulic technology, applied in the field of digital pumps, to achieve the effect of improving the integration performance

Active Publication Date: 2016-06-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the limitations of the pump structure, the piezoelectric pumps currently under study are all fixed flow

Method used

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  • Digital hydraulic pump driven by piezoelectric ceramics
  • Digital hydraulic pump driven by piezoelectric ceramics
  • Digital hydraulic pump driven by piezoelectric ceramics

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Experimental program
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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] Such as figure 1 Shown: A digital hydraulic pump driven by piezoelectric ceramics is mainly composed of a piezoelectric stack actuator 1, a pump body 2, a spring 3, a rigid element 4, an elastic diaphragm 5, a pump chamber 6, and an active valve at the oil inlet 7. Oil inlet 8, oil outlet 9, oil outlet active valve 10, controller 11, drive power 12, control line 13 and other components.

[0029] The pump body 2 of the piezoelectric digital pump is made of stainless steel. The core drive component of the built-in piezoelectric digital pump——piezoelectric stack actuator 1. The interior of the piezoelectric stack actuator 1 is composed of multilayer piezoelectric ceramic sheets, electrodes and insulators, which are integrally formed by pressing through a special process, and are packaged in a metal shell. The whole actuator is integrally connecte...

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PUM

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Abstract

The invention discloses a piezoelectric ceramic driving based digital hydraulic pump. A pump body is divided into an upper portion and a lower portion by an elastic membrane, the upper portion is an oilway structure, and the lower portion is a driving structure. The oilway structure comprises an oil inlet and an oil outlet, the oil inlet is communicated with a pump cavity above the elastic membrane through an oil inlet one-way valve, and the pump cavity is communicated with the oil outlet through an oil outlet one-way valve. The driving structure comprises a piezoelectric stack actuator, a rigid component and a spring, the spring sleeves a push rod of the piezoelectric stack actuator, the rigid component is arranged at the top end of the push rod and is fixedly connected with the elastic membrane, and the piezoelectric stack actuator, the oil inlet one-way valve and the oil outlet one-way valve are controlled by a controller. The piezoelectric stack actuator high in push force and large in displacement is used as a driving source, and the maximum rated operation pressure can reach 10Mpa. By adopting the controller to control the number of layers involved in driving in the piezoelectric stack actuator, pumping flow is digitally controlled.

Description

technical field [0001] The invention relates to a digital pump driven by piezoelectric ceramics (hereinafter referred to as a piezoelectric digital pump). To be precise, it involves a high-voltage compact digital hydraulic pump driven by a piezoelectric stack actuator. Background technique [0002] A hydraulic pump is an energy conversion device that converts mechanical energy into hydraulic energy, and provides hydraulic oil with a certain pressure and flow for the hydraulic system. Traditional hydraulic pumps are driven by electromagnetic motors, which are large in size and weight, and are accompanied by severe vibration, wear and noise during operation. In addition, in a complex hydraulic drive system, it is often necessary to connect many oil pipes and servo valves to distribute the hydraulic oil to each actuator to realize complex driving, so that the movement of the actuator is restricted by the oil pipe. Therefore, the above defects largely limit the application of ...

Claims

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Application Information

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IPC IPC(8): F04B43/04F04B53/10
Inventor 王林翔陈惟峰吴庭
Owner ZHEJIANG UNIV
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