Calibration device and calibration method for valve position indicator
A calibration device and calibration method technology, applied in valve devices, engine components, mechanical equipment, etc., can solve problems such as submersion, secondary instruments cannot work normally, and effective signal voltage cannot be distinguished, and achieve the effect of improving accuracy.
Active Publication Date: 2022-03-22
NUCLEAR POWER INSTITUTE OF CHINA
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Problems solved by technology
[0003]
After the continuous valve position indicator is installed, used and parts are replaced, the calibration point will drift due to the influence of dimensional error, power fluctuation, ambient temperature and component aging. If the calibration point drifts, the secondary instrument will be damaged. The drift voltage and the effective signal voltage cannot be distinguished. In severe cases, the drift voltage can even submerge the effective voltage, so that the secondary instrument of the valve position indicator cannot work normally.
At present, there is no effective device and method for zero position calibration of the valve position indicator
Method used
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[0033] see figure 1 and figure 2 , a calibration device for a valve position indicator provided in this embodiment can be used in conjunction with a valve position indicator 300, especially a continuous valve position indicator, and the valve position indicator 300 can be realized by using a spiral high-precision adjustment The linear movement of the iron core rod 301 can complete the calibration of the structural part of the valve position indicator 300, not only the calibration of the zero position, but also the calibration of the closing point of the valve position and the highest point of opening. Specifically, the calibration device includes a rotary assembly 100 and a display assembly 200, and the rotary assembly 100 includes a screw rod 101 and a differential dial 102, wherein the differential dial 102 adopts a form similar to a flange structure, namely Along the axial direction of the differential dial 102, there is a through hole through the end faces on both sides....
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The invention discloses a calibration device and method for a valve position indicator, and relates to the technical field of valve installation and overhaul, the device comprises a rotary adjusting assembly and a display assembly, the rotary adjusting assembly comprises a screw rod and a differential dial which are in threaded connection with each other, and one end of the screw rod is rotatably connected with an iron core rod of the valve position indicator; the display assembly comprises a display instrument and an electrical connector which are sequentially connected in series, the electrical connector is connected with a sensor coil of the valve position indicator, and the display instrument is used for converting a valve position signal into an analog quantity signal and displaying the analog quantity signal; the method is operated based on the device and comprises a mechanical calibration step and an electrical calibration step. According to the calibration device and method, the iron core rod of the valve position indicator is pushed through the rotary adjusting assembly based on spiral motion, then the analog quantity signal is displayed in real time according to the display assembly, and the zero point position of the valve position indicator can be effectively judged and calibrated according to the analog quantity signal.
Description
technical field [0001] The invention relates to the technical field of valve installation and maintenance, in particular to a calibration device and a calibration method for a valve position indicator. Background technique [0002] The valve position indicator is used to indicate the switch state or opening height (opening degree) of the valve, and transmit and display the valve position signal in real time on site to ensure the safety of the valve action. Among them, the continuous valve position indicator adopts the principle of linear variable differential transformer, and has a primary coil and two secondary coils wound inside. When the primary coil provides an AC signal, an alternating magnetic field will be generated, causing Two adjacent secondary coils generate induced electromotive force. When the sensor core is in the middle of the two secondary coils (zero position), the induced potential is equal in size and the output voltage is zero. When the core deviates from...
Claims
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Login to View More IPC IPC(8): F16K37/00
CPCF16K37/0016F16K37/0083Y02E30/30
Inventor 罗世洪周永辉王宇翔李朋洲尹韧刊李晓钟
Owner NUCLEAR POWER INSTITUTE OF CHINA