Bar type pressure measuring device with circuit electric measurement digital display

Abstract

The invention provides a bar type pressure measuring device with a circuit electric measurement digital display. The device comprises more than two groups of pressure measuring components; each group of pressure measuring components comprises a pressure measuring tube, a communication positioning pipe arranged at the top of the pressure measuring tube, a pressure measuring pipe connected to the communication positioning pipe, a guide pipe communicated with the compressed air in the pressure measuring tube, a valve arranged on the guide pipe, a pressure difference sensor and a ruler used for calibrating the level in the pressure measuring tube. The two groups of pressure measuring components are connected to the pressure difference sensors through the valves. A traditional pressure measurement tube used for measuring the water head pressure in basic tests of hydrodynamics and hydraulics can be widely replaced with the pressure measurement device, the basic principle of the hydrodynamics is utilized ingeniously, the traditional measurement manner and the novel measurement manner are combined well, and the fine teaching effect is achieved.

Description

technical field [0001] The invention relates to the field of experimental measurement, in particular to a row-type pressure measuring device with a circuit electric measuring digital display. 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, the piezometric tube is one of the most commonly used pressure measuring instruments in the process of hydraulic and fluid mechanics experiments. It is the simplest type of liquid column pressure gauge. It uses a transparent straight glass tube with a diameter of The lower end of the pipe is sealed with the measuring point through a hose, and the upper end of the pipe is open to the atmosphere. According to the rising height of the liquid column in the pressure pipe, the pressur...

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Problems solved by technology

However, the zero point of the scale is suspended at a certain height close to the test table. Depending on the height of the installation position, there is an up and down deviation relative to the test table. It is difficult to accurately maintain the zero point of the differential pressure measured by the differential sensor

[0006] (2) Multiple sensors will generate multiple zero points, which is not only costly and troublesome in experimental adjustment, but also easily accumulates and superimposes the different measurement errors of multiple sensors when they are compared with each other and substituted into a formula for calculation.

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