Laser-type intelligent valve positioner

Abstract

The invention relates to a laser-type intelligent valve positioner, and belongs to the technical field of positioners. The laser-type valve positioner comprises a power supply, a front-end detector, aCPU, a driving circuit, a piezoelectric pneumatic amplifier, a pressure sensor, a pressure processing circuit, a laser displacement sensor, a valve position processing circuit, a feedback part, a liquid crystal display and a key. An input signal is sent into the CPU through the power supply and the front-end detector, the CPU drives the driving circuit to control the piezoelectric pneumatic amplifier and the laser displacement sensor to act, an air source enters an execution mechanism through a filter and pressure reduction valve and the piezoelectric pneumatic amplifier to push a valve rod to move, and the feedback part feeds the displacement to the CPU. The laser-type intelligent valve positioner has the beneficial effects that non-contact valve position feedback is adopted, so that mechanical abrasion and faults are avoided; limitations of the rotation angle range are avoided, and the laser-type intelligent valve positioner is suitable for the total stoke within the measurement range of the laser displacement sensor; the linear displacement of the actual valve position is fed back, debugging is not needed, and only self-inspection needs to be conducted after the stoke and action mode are set; and the response speed is high, the precision is high, and delay is avoided.

Description

technical field [0001] The invention relates to a laser type intelligent valve positioner, which belongs to the technical field of valve positioners. Background technique [0002] Most of the current intelligent valve positioners adopt the mechanical connection between the feedback connecting rod and the push rod of the actuator. The actual displacement of the push rod is transmitted to the potentiometer in the position sensor through the feedback plate, feedback shaft and gear mechanism. The displacement of the rod is converted into an electrical signal and fed back to the microprocessor of the valve positioner. [0003] The displacement sensor in this kind of valve positioner converts the displacement of the valve stem into a rotation angle, which has a certain range of rotation angle. It needs to be repeatedly debugged during installation to prevent the actual effective stroke of the valve from appearing outside the rotation angle range of the displacement sensor. Often d...

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Problems solved by technology

[0003] The displacement sensor in this kind of valve positioner converts the displacement of the valve stem into a rotation angle, which has a certain range of rotation angle. It needs to be repeatedly debugged during installation to prevent the actual effective stroke of the valve from appearing outside the rotation angle range of the displacement sensor. Often due to transportation The bumps in the process lead to inaccurate valve opening after on-site installation, which needs to be re-adjusted; there is mechanical wear on the connection with the actuator push rod, and mechanical failures are more likely to occur when the on-site working conditions are harsh

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