Intelligent valve locator

Abstract

The invention discloses an intelligent valve locator which is characterized by comprising a control unit, a valve location acquisition unit, an actuating unit, a controlled system, and a front-end input unit; to be specific, the control unit receives a deviation value between a set signal and a feedback signal to realize high-precision conversion, calculation and PWM output; the valve location acquisition unit monitors location of a valve spool of a controlled valve in real time; the actuating unit is composed of two piezoelectric valve type I / P electric appliance conversion units, the piezoelectric valves realize air feeding and discharging of an air chamber of the actuating unit as an ARM controller outputs PWM control signals to control switching; the controlled system is composed of a pneumatic diaphragm actuator and a linear-motion plunger valve, and the air chamber of the pneumatic diaphragm actuator is connected with two piezoelectric valves; the front-end input unit provides power supply and the set signal. According to the intelligent valve locator, the locator and the valve can be installed separately, non-contact field detection is achieved, and high-load problem of an input circuit is solved.

Description

technical field [0001] The invention relates to a valve positioner, in particular to an intelligently controlled valve positioner. Background technique [0002] The valve positioner is divided into pneumatic valve positioner, electric valve positioner and intelligent valve positioner according to the structure. It is the main accessory of the control valve and is usually used in conjunction with the pneumatic control valve. The signal is used to control the pneumatic control valve. When the control valve operates, the displacement of the valve stem is fed back to the valve positioner through the mechanical device, and the valve position status is transmitted to the upper system through the electrical signal. [0003] In some harsh on-site working conditions, such as too high or too low ambient temperature, strong vibration of valves or pipelines, and strong radiation and strong electromagnetic interference in the on-site environment, the intelligent valve positioner installe...

AI Technical Summary

Problems solved by technology

[0003] In some harsh on-site working conditions, such as too high or too low ambient temperature, strong vibration of valves or pipelines, and strong radiation and strong electromagnetic interference in the on-site environment, the intelligent valve positioner installed on the valve is not very good. work, life expectancy will be greatly reduced

[0004] Various mechanical transmission mechanisms and contact potentiometers are commonly used as sensors, so there are often adverse phenomena such as wear, oxidation, aging, and mechanical hysteresis, which seriously affect the measurement and control accuracy.

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