Frequency conversion type intellective electromotion unit for valve

Abstract

This invention relates to a conversion intelligent valve electric device including a master controller module, a conversion drive module, an asynchronous motor, a mechanical drive device, a temperature sensor, a multi-coil absolute coder, a LCD and an operation mode selecting button characterizing in using a conversion drive module to drive the asynchronous motor, testing output torque by computing electricity and taking the coder as a location sensor and a temperature sensor is installed in the asynchronous motor, and the control mode includes local control, remote control, remote control to switch volume, remote control to simulation volume and bus line control.

Description

(1) Technical field [0001] The invention relates to a valve electric device, in particular to a frequency conversion intelligent valve electric device. (2) Background technology [0002] At present, the widely used valve electric devices all use AC voltage to directly drive the motor, and drive the valve to run through the mechanical transmission device, causing the starting current of the motor to increase exponentially. At the same time, the motor speed remains unchanged during the entire valve operation process, and the valve opening and closing speed remains unchanged , when the larger-diameter valves in the pipe network system are closed, water hammer is easily generated, causing dangerous accidents such as pipe bursts in the pipe network system. [0003] On the other hand, the existing electric devices all adopt the mechanical torque detection method, which is easily affected by the deformation of the mechanical structure, the change of the ambient temperature and othe...

AI Technical Summary

Problems solved by technology

[0002] At present, the widely used valve electric devices all use AC voltage to directly drive the motor, and drive the valve to run through the mechanical transmission device, causing the starting current of the motor to increase exponentially. At the same time, the motor speed remains unchanged during the entire valve operation process, and the valve opening and closing speed remains unchanged , when the larger-diameter valves in the pipe network system are closed, water hammer phenomenon is easily generated, causing dangerous accidents such as pipe bursts in the pipe network system

[0003] On the other hand, the existing electric devices all adopt the mechanical torque detection method, which is easily affected by the deformation of the mechanical structure and the change of the ambient temperature, and the detection accuracy is easily affected, and at the same time, the volume of the device is complicated.

[0004] In addition, most of the valve position detection methods of existing electric devices use gear transmission, counter amplification, and then output through potentiometers, cams and contacts. After such a complicated electromechanical process, its accuracy will be greatly distorted. High-precision measurement cannot be achieved. In addition, due to the limitation of the number of mechanical contacts on the cam, the output detection value can only be an intermittent analog signal, and the intermittent analog signal cannot meet the requirements of networked automatic control.

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