Flow rate measuring device based on efficient water head

Abstract

The invention discloses a flow rate measuring device based on an efficient water head. The device comprises an experimental water tank of which the sidewall is provided with an outlet, a liquid-air converting pressure measuring barrel arranged in the experimental water tank, a liquid pressure difference sensor which is connected with the liquid-air converting pressure measuring barrel and used for detecting the pressure difference between compressed in the liquid-air converting pressure measuring barrel and the outside air, and a microcomputer which is connected with the liquid pressure difference sensor and used for converting a pressure difference signal detected by the liquid pressure difference sensor into the flow rate of the outlet, wherein the bottom part of the liquid-air converting pressure measuring barrel is communicated with an inner space of the experimental water tank, and while the top part of the liquid-air converting pressure measuring barrel is provided with a communication positioning tube; the bottom surface of the communication positioning tube is positioned on a medium shaft level of the outlet. With the adoption of the device, the jet flow rate of a momentum experiment instrument in the basic liquid mechanics experiment, a hole opening, and a hole opening and a tube nozzle in a tube nozzle experiment instrument can be conveniently digitally accurately measured; the teaching effect is good.

Description

technical field [0001] The invention relates to the field of experimental measurement, in particular to an orifice and nozzle type flow measuring device based on an acting water head. 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. Among them, orifice and nozzle outflow is one of the important learning contents in this teaching field. Holes are opened on the vertical wall of the container, and the flow phenomenon that the fluid flows out through the orifice is called orifice outflow. The outflow condition can be the outflow under a constant water head or the outflow under a variable water head, it can be in the air, or it can be Flow into the fluid of the same medium. Install a short tube with a length about 3 to 4 times th...

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Problems solved by technology

[0005] The market and public technical information show that there are many kinds of modern measuring devices and invention patents related to the measurement of liquid flow in pipelines and open channels, but there is no better high flow rate for orifice nozzles under low pressure water head of desktop experimental instruments. Precision digital real-time measuring device

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