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Flow measurement method of Venturi tube

A Venturi tube and flow measurement technology, which is applied in the field of Venturi tubes, can solve problems such as inaccurate flow measurement, achieve the effects of improving measurement accuracy, widening the range of wandering measurement, and meeting the needs of flow measurement

Inactive Publication Date: 2022-04-29
WEICHAI POWER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a flow measurement method of a Venturi tube to solve the inaccurate technical problem of the flow measurement of the Venturi tube in the prior art

Method used

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  • Flow measurement method of Venturi tube
  • Flow measurement method of Venturi tube
  • Flow measurement method of Venturi tube

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Embodiment Construction

[0023] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0024] Such as figure 1 and figure 2 As shown, Embodiment 1 of the present invention provides a Venturi tube, the Venturi tube includes a tube body 10 and an adjustment member 20, the tube body 10 has an inlet 11, an outlet 12, and an inlet 11 and an outlet 12 connected in sequence. A throat 13 is also provided between the inlet 11 and the outlet 12 in the communication channel. The adjusting part 20 is movably arranged in the flow channel, and at least part of the adjusting part 21 of the adjusting part 20 is located at the throat 13; the adjusting section of the adjusting part 21 decreases gradually along the flow direction of the flow channel to adjust The size of the flow section 15.

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Abstract

The invention provides a venturi tube flow measurement method, which comprises the following steps: acquiring a pressure ratio between a throat of a venturi tube and an inlet of the venturi tube, and comparing the acquired pressure ratio with a preset pressure ratio range; according to the comparison result of the pressure ratio and the preset pressure ratio range, the position of an adjusting piece of the Venturi tube is adjusted, so that the adjusted pressure ratio is within the preset pressure ratio range; and calculating the gas flow of the venturi tube according to the detected cross-sectional area A1 of the inlet of the venturi tube, the detected cross-sectional area A2 of the throat of the venturi tube, the gas pressure P1 at the inlet of the venturi tube and the gas temperature T1 at the inlet of the venturi tube. Through the technical scheme provided by the invention, the technical problem of inaccurate flow measurement of the Venturi tube in the prior art can be solved.

Description

technical field [0001] The invention relates to the technical field of Venturi tubes, in particular to a method for measuring the flow rate of a Venturi tube. Background technique [0002] At present, in the engine control system, the Venturi tube is widely used for gas flow measurement, such as air, exhaust gas, etc. The principle of the Venturi tube to measure the gas flow is that when a certain flow of gas flows through the Venturi tube, from the inlet to the throat of the Venturi tube, the flow section is continuously reduced. According to the Bernoulli principle, the gas flow rate increases and the pressure decreases. The pressure and temperature of the gas at the inlet and the pressure of the gas at the throat are measured by the sensor. In the case of known inlet and throat cross-sections, according to the basic fluid mechanics equation, the gas flow through the Venturi tube can be calculated relatively easily. gas flow. [0003] However, according to Bernoulli's pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/44
CPCG01F1/44
Inventor 徐帅卿李卫谭峰卫阳飞
Owner WEICHAI POWER CO LTD
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