An Orifice Nozzle Type Flow Measuring Device Based on Acting Head

Abstract

The invention discloses a flow measurement device based on the acting water head, which comprises: an experimental water tank with an outlet on the side wall; a liquid-gas conversion pressure measuring cylinder arranged in the experimental water tank; The bottom communicates with the inner space of the experimental water tank, and the top of the liquid-gas conversion pressure measuring cylinder is provided with a communication positioning tube, and the bottom surface of the communication positioning tube is located on the horizontal plane of the central axis of the outlet; The conversion pressure measurement cylinder is used to detect the fluid pressure difference sensor of the pressure difference between the compressed air in the liquid-gas conversion pressure measurement cylinder and the outside air; The differential pressure signal is converted into the microcomputer of the outlet flow. The invention can conveniently digitize and accurately measure the jet flow rate of the momentum experiment instrument and the orifice and nozzle experiment instrument of the orifice and nozzle experiment instrument in the basic experiment of fluid mechanics, and has good teaching effect.

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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