Electric hydraulic executing device

Abstract

The invention provides an electric hydraulic executing device, comprising a bracket with a buckle at the lower end. The top end of a pull rod arranged at the top end of the bracket is fiedly connected with a piston; a cylinder body is sleeved at the outer side of the piston; the upper end of a resetting spring sleeved at the outer side of the cylinder body is abutted against the cylinder body, and the lower end of the resetting spring is abutted against the bracket; the piston and the cylinder body are matched below the middle part and the bottom part of the piston, so as to form a constant-pressure oil cavity and a high-pressure oil cavity, which are isolated in a sealed manner; an output shaft of a motor arranged in a cavity between a sealing cover which is fixedly connected at the top end of the piston and the top of the piston passes through the lower parts of the constant-pressure oil cavity and the lower part of the piston, and is connected with a gear pump which is internally embedded at the bottom of the piston; an oil inlet of the gear pump is communicated with the constant-pressure oil cavity through an oil inlet channel, and an oil outlet of the gear pump is communicated with the high-pressure oil cavity; the piston between the constant-pressure oil cavity and the high-pressure oil cavity is provided with an oil return channel provided with an oil return control mechanism; a driving rod provided with a mutual control plate is arranged at the bottom of the cylinder body; and the motor, the gear pump and the oil return control mechanism are respectively connected with a control device. The electric hydraulic executing device has the advantages of small size, reliable property and high control precision.

Description

Technical field: [0001] The invention relates to a hydraulically driven valve device, in particular to an electrohydraulic actuator. Background technique: [0002] In the pipeline adjustment, based on the control requirements of temperature, pressure, pressure difference, flow, etc., it is necessary to adjust the fluid in the pipeline and perform valve position feedback. This is the hardware for various control devices to achieve control purposes on the pipeline site Realize the unit. Precisely controlling the opening position of the heating valve is the key to effectively guarantee the quality of heating. [0003] Among the regulating valves widely used in various industries, straight stroke valves are generally used. At present, most of the valves use a servo motor to control the opening or closing of the valve through a gear reduction device, or a pneumatic method, so as to adjust the size of the fluid. However, this kind of device for controlling the valve has large v...

AI Technical Summary

Problems solved by technology

However, this kind of control valve device has large volume, high failure rate, low control accuracy and cumbersome maintenance work.

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