Frequency conversion type intellective electromotion unit for valve

Abstract

The invention relates to a variable frequency intelligent valve electric device. It includes main controller module (1), variable frequency drive module (2), asynchronous motor (3), mechanical transmission device (4), temperature sensor (5), multi-turn absolute encoder (6), liquid crystal display (7 ) and the operating mode selection knob (8). Its main feature is that the asynchronous motor is driven by a variable frequency drive module, the output torque is detected by means of electricity consumption calculation, and a multi-turn absolute encoder is used as a position sensor, and a temperature sensor is installed in the asynchronous motor. The control methods include local control, remote operation, remote switch control, remote analog control, and bus control. The invention has the advantages of small size, high reliability, flexible opening and closing of valves, effective elimination of "water hammer" phenomenon, fast and accurate torque protection, easy network control and the like.

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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