Gas Roots flow measuring device and flow correction method for same

Abstract

The invention relates to a gas Roots flow measuring device and a flow correction method for the same. The gas Roots flow measuring device comprises a gas Roots flow meter and a control circuit. The control circuit comprises a central processing unit and a Roots signal processing unit, a display unit, a temperature measuring unit, a pressure measuring unit and a differential pressure measuring unit. A Roots sensor is connected with the Roots signal processing unit. The flow correction method comprises acquiring the temperature and the pressure of a gas flowing through a gas flow measuring pipe in real time, measuring differential pressure values of the gas at front and rear ends of the gas flow measuring pipe in real time, transmitting the data to the central processing unit for analysis and processing to obtain the density of the gas at the temperature and under pressure, calculating the leakage flow of the gas, correcting the flow obtained by the Roots sensor, and sending the flow to the display unit for displaying. By means of the gas Roots flow measuring device and the flow correction method for the same, effects of flow leakage on the flow metering are prevented, and the measuring accuracy of the gas Roots flow measuring device is improved.

Description

technical field [0001] The invention relates to a gas flow meter, in particular to a gas Roots flow measuring device and a flow correction method thereof which improve the gas flow measurement accuracy. Background technique [0002] The working principle of the Roots flowmeter is to use the waist wheel to continuously divide the fluid into a single metering unit with a known volume, and repeatedly fill the metering unit with fluid and then drain the fluid in the metering unit to calculate the cumulative flow. The flow of fluid through the flowmeter. Roots flowmeter has the characteristics of insensitivity to the upstream flow field distribution, no requirement on the straight pipe section in front of the meter, high measurement accuracy, suitable for high-viscosity fluid, and can directly obtain the cumulative flow of the fluid. It is widely used in oil, water, and natural gas. And gas metering and other fields. [0003] However, the current gas Roots flowmeter generally h...

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly solves the technical problem that the original gas Roots flowmeter has leakage phenomenon, which causes the flow measurement accuracy is not high; it provides a gas Roots flow measurement device and its flow correction method, which is based on the real-time measurement of the gas to be measured. The state calculates the leakage flow, so that the flow value measured by the waist wheel sensor is corrected in real time, and the measurement accuracy of the gas Roots flowmeter is greatly improved.

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