A gas flow measuring device and measuring method

Abstract

The invention, which relates to the technical field of fluid flow measuring, discloses a gas flow measuring device and measuring method. The measuring device comprises a first closed container containing liquid, a second closed container containing liquid, a drain pipeline, an inlet pipeline, an outlet pipeline, and a bypass pipeline and a liquid level detecting device. The inlet pipeline is usedfor injecting constant-pressure gas into an area above a liquid surface in the first closed container, wherein the constant-pressure gas is insoluble with the liquid. The outlet pipeline is connectedto the second closed container. The bypass pipeline is communicated with the area above the liquid surface in the first closed container and the second closed container. One end of the drain pipelineis arranged inside the liquid in the first closed container and the other end is arranged in the second closed container. The liquid level detecting device is used for detecting the liquid level in the first closed container or the second closed container. According to the measuring device, the flow amount and flow rate of the gas at the micro flow rate can be measured; and the measurement precision is high and the range is large.

Description

technical field [0001] The present application relates to the technical field of fluid flow measurement, in particular to a gas flow measurement device and a measurement method. Background technique [0002] Indoor scientific experiments often require a flowmeter that can meet the requirements of high measurement accuracy, large range, and micro flow. [0003] Some flowmeters, which can measure micro flow, have a small range; those with a large range cannot measure micro flow. There are many requirements for the physical characteristics of the measured fluid and the measurement environment. For example, the differential pressure flowmeter needs a long straight pipe section, the connection between the throttling device and the display instrument is prone to leakage, and the measurement accuracy is high; the vortex flowmeter is suitable for low static Fluids such as high pressure, low flow rate, low density and high viscosity are not suitable; electromagnetic flowmeters canno...

AI Technical Summary

Problems solved by technology

There are many requirements for the physical characteristics of the measured fluid and the measurement environment. For example, the differential pressure flowmeter needs a long straight pipe section, the connection between the throttling device and the display instrument is prone to leakage, and the measurement accuracy is high; the vortex flowmeter is suitable for low static Fluids such as high pressure, low flow rate, low density and high viscosity are not suitable; electromagnetic flowmeters cannot measure petroleum products with low conductivity, and cannot measure gases, steam and liquids with large bubbles; rotameters have low pressure resistance and anti-electromagnetic interference Low capacity; fixed displacement flowmeters (such as gear flowmeters, scraper flowmeters, rotameters, piston flowmeters, etc.) The physical properties of the ultrasonic flowmeter have a great influence on the flow characteristics, and the calibration characteristics cannot be maintained for a long time; the ultrasonic flowmeter is too small to measure micro-flow; the mass flowmeter cannot measure low-pressure gas, and the liquid with high gas content cannot be accurately measured

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