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Simple Liquid-column type measuring device for calibrating vacuum

A measuring device and liquid column technology, applied in the direction of measuring devices, measuring fluid pressure, instruments, etc., can solve the problems of transmitter measurement distortion, measurement range cannot be verified, and affect operation judgment, so as to reduce errors, measure accurately, The effect of meeting the measurement range

Active Publication Date: 2015-04-22
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Vacuum transmitters are widely used in many industrial fields. At present, according to the calibration procedure JJG882-2004, the vacuum calibration evacuation limit is 90% of the atmospheric pressure, calculated based on the standard atmospheric pressure, and the minimum absolute pressure that can be calibrated is 10.133kPa; however, the steam turbine exhaust pressure of the power plant is designed to be about 5kPa, so the vacuum transmitter of the power plant cannot be calibrated in the frequently used range; the ambient temperature of the atmosphere in winter and summer is different, and the difference in atmospheric pressure is close to 4kPa, which is also error in calibration
If the calibration is inaccurate, the data measured by the vacuum transmitter will be distorted, especially in power plants with seawater as the cooling medium, the problem of transmitter measurement distortion often occurs in winter, which affects the operation judgment on the one hand, and then affects the final stage of the steam turbine The safe operation of the blades; on the other hand, it affects the judgment of the optimal vacuum of the steam turbine, which in turn affects the operation adjustment of the power plant and the economy of the unit

Method used

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  • Simple Liquid-column type measuring device for calibrating vacuum
  • Simple Liquid-column type measuring device for calibrating vacuum

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Embodiment 1

[0023] Embodiment 1: long 11 meter pipeline 8 adopts international standard round steel, pipeline specification 377×6, pipe cross-sectional area S=π*D 2 / 4=3.141593*0.365 2 / 4=0.104635m 2 , the volume after being filled with water V=L*S=11*0.104635=1.150981m 3 .

[0024] The water pump 5 is a miniature water pump with a flow rate of 100L / min and a head of 15m. The maximum weighing capacity of weighing tank 9 is 1.5 tons, and the minimum resolution is gram. Measuring barrel 6 bottom area 1.5m 2 , 1 meter high, maximum measuring volume 1.5m 3 . The valve adopts a needle valve with good sealing performance. Suppose there is an absolute pressure transmitter with a range of 0-15kPa, and its most commonly used range is 5.0kPa.

[0025] Use pure water at 20°C as the calibration medium.

[0026] Step (1): Install the transmitter to be calibrated 2, open the connection valve 1, open the air isolation valve 3, the pump outlet valve 4, the drain valve A7 at the bottom of the p...

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Abstract

The invention discloses a simple liquid-column type measuring device for calibrating vacuum. The simple liquid-column type measuring device for calibrating the vacuum comprises a transmitter to be calibrated, a connecting valve of the transmitter to be calibrated, an air-isolation valve, a pump outlet valve, a water pump, a measuring barrel, a pipeline bottom water drain valve A, a pipeline bottom water drain valve B, a pipeline, a weighing tank and a weighing tank bottom water drain valve. The transmitter to be calibrated is connected with the inlet of the pipeline through the connecting valve of the transmitter to be calibrated, the other end of the pipeline is connected to the weighing tank, the on-off between the weighing tank and the pipe line is controlled through the pipeline bottom water drain valve B, the bottom of the weighing tank is connected to the measuring barrel through the water drain valve, the measuring barrel is connected with the pipeline, the on-off between the measuring barrel and the pipeline is controlled through the pipeline bottom water drain valve A, the other end of the measuring barrel is connected with the water pump, the water pump is connected with the pump outlet valve, the pump outlet valve is connected to the air-isolation valve, and the air-isolation valve is connected to the inlet of the pipeline. The simple liquid-column type measuring device for calibrating the vacuum achieves continuous calibration of the vacuum transmitter, meets the measuring span of the transmitter, is accurate in measurement, and effectively reduces errors.

Description

technical field [0001] The invention relates to a liquid column type simple measuring device for checking vacuum. Background technique [0002] Vacuum transmitters are widely used in many industrial fields. At present, according to the calibration procedure JJG882-2004, the vacuum calibration evacuation limit is 90% of the atmospheric pressure, calculated based on the standard atmospheric pressure, and the minimum absolute pressure that can be calibrated is 10.133kPa; however, the steam turbine exhaust pressure of the power plant is designed to be about 5kPa, so the vacuum transmitter of the power plant cannot be calibrated in the frequently used range; the ambient temperature of the atmosphere in winter and summer is different, and the difference in atmospheric pressure is close to 4kPa, which is also error in calibration. If the calibration is inaccurate, the data measured by the vacuum transmitter will be distorted, especially in power plants with seawater as the cooling...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L27/00
Inventor 吕海祯杨承学
Owner STATE GRID CORP OF CHINA
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