Jam-proof intelligent valve positioner

Abstract

The invention discloses a jam-proof intelligent valve positioner which comprises an electric pneumatic converter, a circuit control component and a displacement detection feedback unit, wherein the electric pneumatic converter comprises a pneumatic amplifier, a nozzle arranged at the backpressure opening of the pneumatic amplifier, a baffle covering the nozzle and an electromagnetic drive mechanism for driving the baffle to control the cover degree of the baffle and the nozzle; the electromagnetic drive mechanism is controlled by a current control signal emitted from the circuit control component; a micro pressure reduction valuator is arranged at the air inlet of the pneumatic amplifier; the micro pressure reduction valuator comprises a constant throttling screw, a pressure relief spring sleeving the constant throttling screw and a sealing ring; the constant throttling screw is matched with a constant throttling orifice formed in the pneumatic amplifier. The jam-proof intelligent valve positioner provided by the invention has the characteristics of resisting air source wave disturbance and vibrating disturbance and preventing electromagnetic interference, is stable and reliable in property and beneficial to marketing promotion, and can effectively ensure the reliability and positioning stability in complex disturbance conditions.

Description

technical field [0001] The invention relates to the field of pneumatic valve adjustment devices, in particular to an anti-interference intelligent valve positioner. Background technique [0002] The positioner is an important control accessory of the control valve. The intelligent valve positioner mainly includes two parts: a signal processing unit and a valve position feedback unit (hereinafter referred to as the valve position feedback unit). The signal processing unit receives the external positioning signal (such as 4~20mA current signal, HART digital signal, etc.), and calculates and outputs the driving electric signal according to the sampling signal of the valve current position provided by the valve position feedback unit, and converts it into the corresponding signal through the I / P conversion unit. The pneumatic signal drives the regulating valve to move, and the position change of the regulating valve is sensed by the valve position feedback unit. The system colle...

AI Technical Summary

Problems solved by technology

[0004] The positioner is mostly used in various industries such as chemical industry, coal, petroleum, etc. The on-site use environment is complex, and there are many sources of interference, such as electromagnetic interference, unstable and fluctuating air source interference, vibration interference, unstable input current and excessive input, etc., which will affect the The use effect and reliability of the locator will cause serious damage to the locator

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