Pure-water bidirectional opposed piezoelectric ceramic reversing valve

Abstract

The invention discloses a pure-water bidirectional opposed piezoelectric ceramic reversing valve, which comprises mechanisms of two opposed piezoelectric ceramic actuators, a spherical spool disposed in an inner hole of a valve body, a return spring, a spring pushrod and the like. A water inlet, a working opening and a water-returning opening are arranged at the upper end of the valve body and are communicated with each other. On or off of a loop is formed by disconnection or connection between a ceramic ball and a valve seat to change liquid-flowing direction so as to reverse a liquid path as needed. By the pure-water bidirectional opposed piezoelectric ceramic reversing valve, zero-leakage can be achieved by direct sealing between the spool and a valve sleeve and between the valve sleeve and the valve body and by linear sealing between the ceramic spherical spool and the valve seat. By the aid of a valve port damper arranged additionally, static and dynamic performance of the reversing valve can be improved. By the piezoelectric ceramic actuators with high output power, rapid switch can be realized. The pure-water bidirectional opposed piezoelectric ceramic reversing valve has the advantages of good generality and convenience in standardization, and is particularly suitable for working in the aqueous medium environment with low flow, high response and strong electromagnetic field effect.

Description

technical field [0001] The invention relates to valves, in particular to a pure water two-way opposing piezoelectric ceramic reversing valve. Background technique [0002] Due to its unique advantages of environmental protection and flame retardancy, pure water hydraulic technology is being widely valued by hydraulic circles all over the world, and pure water hydraulic components have also become one of the key research contents. The reversing valve is one of the most critical valve components in the hydraulic system, and the research on the reversing valve suitable for the pure water hydraulic system has also become a research focus. [0003] Most of the traditional hydraulic directional valves are slide valve, rotary valve or cone valve. The unbalanced force on the spool of the slide valve type and rotary valve type reversing valve is very small, and the required operating force is also small, but there must be a gap for relative movement between the spool and the valve h...

AI Technical Summary

Problems solved by technology

The spool of the valve is directly driven by a multilayer piezoelectric driver, and the spool has displacement feedback to realize closed-loop control. However, the output displacement of the piezoelectric driver is very small, and it can only control a very small flow rate, and the inherent hysteresis of the piezoelectric material The effect is large and the repeatability is poor, which limits the application and development of piezoelectric servo valves

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