Self-circulation Bernoulli experimental device with teaching effect flow digital display function

Abstract

The invention discloses a self-circulation Bernoulli experimental device with a teaching effect flow digital display function. The self-circulation Bernoulli experimental device comprises a self-circulation Bernoulli experimental instrument, wherein the self-circulation Bernoulli experimental instrument comprises a Bernoulli experimental pipeline, a pressure difference high-end liquid gas converting tube, a pressure difference low-end liquid gas converting tube, a pressure difference sensor and a microcomputer digital display meter; one section in the Bernoulli experimental pipeline is a pressure difference type flow signal generator used for generating pressure difference signals; the pressure difference high-end liquid gas converting tube and the pressure difference low-end liquid gas converting tube are connected with the pressure difference type flow signal generator; the pressure difference sensor is connected with the pressure difference high-end liquid gas converting tube and the pressure difference low-end liquid gas converting tube in a sealed way and is used for detecting the pressure difference; the microcomputer digital display meter is connected with the pressure difference sensor and is used for converting pressure difference signals detected by the pressure difference sensor into flow. The self-circulation Bernoulli experimental device has the advantages that the teaching effect flow digital display function is achieved; in the optimal technical scheme, the self-circulation Bernoulli experimental device with the teaching effect flow digital display function can also realize the real-time zero setting function in the normal flow measurement experiment process and is a low-pressure-difference high-precision flow instrument.

Description

technical field [0001] The invention relates to the field of experimental measurement, in particular to a self-circulating Bernoulli experimental device with teaching effect flow digital display. Background technique [0002] The Bernoulli equation is the energy equation of the constant flow of incompressible liquid, and it is one of the three important equations of hydraulics and fluid mechanics. Its physical meaning is: when the water flow flows from one section to another section, the position Energy, pressure energy, and kinetic energy can be converted to each other, but the unit total mechanical energy of the previous section should be equal to the sum of the unit total mechanical energy of the latter section and the energy loss of the fluid between the two sections, and the energy loss is dissipated in the form of heat energy , therefore, the conversion with the other three energies is irreversible. The Bernoulli equation teaching experiment is one of the important te...

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Problems solved by technology

Most of the flow signal pressure difference generated by the differential pressure signal generator (such as Venturi, orifice plate, etc.) of the differential pressure flowmeter is only 0.1-50 cm water column, while the existing flowmeter connects the sensor through the water pipe connecting pipe. It is directly connected to the pressure measuring point of the differential pressure signal generator. The pressure of the sensor is transmitted through the water body. The sensor end is sealed with air barrier inside. The pressurized water column in the connecting pipe cannot directly act on the pressure chip of the sensor. , and because the pressure transmission channel in the sensor is very small, a large surface tension is generated on the liquid-gas interface, and its value can reach 1-5 cm water column, or even larger, so that the pressure error of the flow signal can reach more than 10%. , will cause the middle and low-end flow error to reach 10%-30%, so this type of flowmeter cannot be used in the teaching experiment device with high precision requirements; now there are also non-pressure differential types such as turbine flowmeters with small diameters on the market. Flowmeter, but at present, the flow measurement range of this type of flowmeter with an accuracy of 1%-2% is 70%-100% of its full scale, and it is not applicable below 30%, while the self-circulating Bernoulli experimental instrument The experimental flow range is just below 30%, so it cannot be selected

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