Intelligent large-flow electro-hydraulic valve

Abstract

The invention relates to an intelligent large-flow electro-hydraulic valve, and belongs to a hydraulic valve. An upper housing and a lower housing are fixed on a valve seat; an elastic diaphragm is pressed between the valve seat and the upper housing; a partition board is pressed between the valve seat and the lower housing; a valve body is sleeved inside a valve cavity; the valve body is composed of a valve core, and an upper post rod and a lower post rod; a top block and a piston are fixed at two sides of the elastic diaphragm; the top block presses a piezoelectric stack inside the upper housing; the piston, the valve seat, the upper post rod and a one-way valve form an upper compression chamber; the valve core, the lower post rod, the valve seat and the partition board form a lower compression chamber; an inlet and an outlet are communicated through a valve core ring slot and form a valve hole; the inlet is communicated with the upper compression chamber and the lower compression chamber; the lower post rod presses a disk spring and a sensor inside the lower housing; and the sensor and the piezoelectric stack are respectively connected with an electric control unit through lead groups. The intelligent large-flow electro-hydraulic valve has the advantages that the displacement of the valve core is increased by the compression chambers; the movement state of the valve core can be measured by the sensor; and the intelligent large-flow electro-hydraulic valve is large in valve flow and damping regulating range, high in flow control accuracy and high in reliability, and especially suitable for large-scale precise flow and damping regulation.

Description

technical field [0001] The invention belongs to a hydraulic valve in the field of fluid drive and control, in particular to an intelligent large-flow piezoelectric hydraulic valve. Background technique [0002] Utilizing the characteristics of the piezoelectric stack vibrator to produce expansion and contraction deformation under the action of voltage, various types of piezoelectric stack hydraulic valves have been developed at home and abroad, because of their fast response, no electromagnetic interference, high precision, and controllability. It is widely used because of its good performance and many other advantages. At present, most of the piezoelectric stack hydraulic valves proposed at home and abroad are direct-push structures, that is, the expansion and contraction of the piezoelectric stack is directly used to drive the movement of the valve core, and a single valve hole is used for fluid control, such as Chinese patents 02158122.3 and 200710117696.6 . It is used ...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides an intelligent large-flow piezoelectric hydraulic valve to solve the problems of existing piezoelectric stack hydraulic valves, such as small valve flow adjustment and control range, and low flow control accuracy and reliability.

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