Digital display flow meter for experiment teaching based on piezometer tube display and measuring method thereof

Abstract

The invention discloses a digital display flow meter for experiment teaching based on piezometer tube display and a measuring method thereof. The digital display flow meter comprises a pressure difference flow signal generator, two pressure measuring assemblies, a pressure sensor, a microcomputer data display instrument head, a fixed bracket, and a scale, wherein the pressure difference flow signal generator is used for generating pressure difference signals, each pressure measuring assembly comprises a pressure measuring cylinder, a communication positioning tube and a pressure measuring tube, the pressure sensor is used for detecting the pressure difference of compressed air in the two pressure measuring cylinders, the microcomputer data display instrument head is used for converting pressure signals detected by the pressure sensor into flow, the fixed bracket is used for installing the pressure measuring tube, and the scale is used for calibrating the liquid level of the pressure measuring tube. According to the device and the method, the fluid mechanics principle is comprehensively adopted in an innovative way to solve the display difficulty of experiment measurement; besides the device and the method are combined with a traditional pressure measuring tube and a modern measurement technology, have high precision and high display, and can be widely applied to the fluid mechanics experiment teaching instrument; through the device and the method, learning interests of students are motivated, and innovative consciousness of students are inspired; thus the device and the method are beneficial to cultivate innovation capability and have good teaching effect.

Description

technical field [0001] The invention relates to the field of experimental measurement, in particular to a digital display flowmeter with a pressure measuring tube display for experimental teaching and a measuring method. Background technique [0002] Hydraulics and Fluid Mechanics is a major professional basic course for many majors in engineering colleges. Modern hydraulics is based on the three pillars of experiment, theory and calculation. Therefore, experiment is an indispensable content in the teaching process. [0003] Among them, the small flow, small pressure difference, and high-precision digital display flow measurement device for small pipeline water flow used in experimental teaching is currently in a blank state. Taking the small desktop hydrodynamics hydraulics teaching instrument as an example, since its diameter is usually less than 30mm and the flow rate is 5-300ml / s, the flow rate is often very small. Traditionally, the gravimetric method or the volumetric...

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Problems solved by technology

[0007] However, in order to combine the traditional row-type piezometric tube with the high-precision differential pressure flowmeter suitable for low-flow measurement as mentioned above, and integrate it into a complete set of on-site measurement and control innovative experimental equipment, there are still many problems to be solved, such as Real-time zeroing problem, automatic exhaust problem of multiple pressure measuring tubes

[0008] Real-time zero adjustment problem: Like this kind of electrical measuring instrument, it is often necessary to verify the zero point in real time. For example, after the electronic scale is weighed, the zero point can be verified by removing the weight, and the zero point of this instrument is quite stable

This is because the pressure at the measuring point of each piezometric tube is different, and the pressure at the measuring point of some piezometric tubes is very low, even close to atmospheric pressure. The air flow from the pressure measuring port of one or several pressure measuring tubes will cause a short circuit in the gas circuit, and the pressure on the main channel of the gas circuit will drop suddenly, causing the other pressure measuring tubes to be unable to drain water, so the simultaneous exhaust will not be achieved. Effect

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