Hall type intelligent valve positioner

Abstract

The invention discloses a Hall type intelligent valve positioner which comprises a feedback connecting rod structure, an angular travel Hall sensor, a main control circuit, an electric appliance conversion and pneumatic amplifier, a feedback output circuit and an accessory circuit. The feedback connecting rod structure is connected with a valve rod and the angular travel Hall sensor, the angular travel Hall sensor converts angular displacement into electric signals which are transmitted to a main control circuit, sampling, comparing and data processing of front end input signals and valve position feedback signals are completed in the main control circuit, according to differential between differences, intelligent PID operation is carried out, the main control circuit outputs corresponding control quantity which drives a pneumatic actuator through electricity-gas conversion and a pneumatic amplifier, and real-time control over the valve position is achieved. Through the feedback output circuit, current valve position data are output to an upper computer. According to the Hall type intelligent valve positioner, the angular travel Hall sensor can achieve linear measuring on angular displacement, and the control quality of the intelligent valve positioner is improved.

Description

technical field [0001] The invention relates to the fields of electronic information, detection technology and automatic control technology, in particular to a Hall type intelligent valve positioner. Background technique [0002] Valve positioner is one of the key accessories of pneumatic actuators, widely used in industrial and agricultural production, especially in the field of process control engineering. Its working principle is to obtain the current position data of the valve position through real-time sampling of the valve position, and compare it with the data of the set value of the valve position opening, and complete the valve adjustment of the pneumatic valve according to the difference and the change of the difference. Position adjustment and control, so that the valve position opening of the pneumatic actuator is always maintained at the set value. Through the position feedback circuit, the valve position position data can be fed back to the system controller, ...

AI Technical Summary

Problems solved by technology

On the one hand, it can overcome the shortcomings of the contact angular displacement sensor in the positioner, such as large mechanical wear, serious mechanical hysteresis, susceptibility to external vibration, low measurement accuracy, and low structural life; on the other hand, it can overcome the current Hall-type intelligent sensor. The angular displacement Hall sensor in the valve positioner uses the nonlinear measurement principle, which brings about complex calculation formulas, long calculation time, and low accuracy.

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