Valve positioner with memory function and valve fault self-diagnosis method

Abstract

The invention discloses a valve positioner with a memory function and a valve fault self-diagnosis method, and belongs to the technical field of valve positioners. The valve positioner comprises a box. A shield box, an integrated circuit board, a central processing unit, a storage card with a USB interface and a wiring terminal are arranged in the box. A gas amplifier and an electrical / pneumatic converter are installed on a positioner base. A feedback gear and a first position sensor assembly are installed on the positioner base. An output channel and an exhaust channel are installed in the box, the output channel is provided with a first pressure sensor, and the exhaust channel is provided with a second pressure sensor. The method includes the steps that after receiving feedback signals of the position sensor and the second pressure sensor, the central processing unit will work out the signals automatically and compare the signals with signals specified by a control chamber according to a set program. By means of a USB memory storage module, regardless of whether a control system has HART or other communication protocols or not, the valve positioner can perform self-diagnosis on valve faults.

Description

technical field [0001] The invention relates to an intelligent valve positioner and a valve fault diagnosis method, belonging to the technical field of electric valve positioners. Background technique [0002] At present, the valve positioners with online fault detection function on the market are basically intelligent valve positioners imported from abroad. Corresponding to the compressed air signal input to the membrane chamber of the pneumatic control valve, the control element of the pneumatic control valve will be displaced, so as to achieve the purpose of controlling the flow, pressure and temperature of the device. During the process of displacement of the control element of the pneumatic control valve, the pressure of the valve membrane chamber and the position of the control element of the valve change. The pressure sensor and the position sensor convert the change of pressure and position into corresponding electrical signals and feed them back to The CPU of the i...

AI Technical Summary

Problems solved by technology

[0003] In the original control valve fault detection scheme, the valve positioner must be an intelligent valve positioner and must match the HART protocol or other communication protocols, and must have a dedicated analysis software system, which is costly and poor in versatility

For a control system without a communication protocol and a dedicated analysis software, even if it is equipped with an imported intelligent valve positioner, the detected data cannot be analyzed, cannot be put into application, and cannot diagnose valve faults

For devices using mechanical valve positioners, data cannot be stored, and valve failures cannot be diagnosed

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