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A Venturi Flowmeter

A flowmeter and Venturi technology, applied in the field of Venturi flowmeters, can solve the problems of adverse effects of Venturi flowmeter measurement accuracy and high degree of disorder, and achieve the effects of offsetting effects, improving measurement accuracy, and optimizing speed distribution.

Active Publication Date: 2020-08-21
WEICHAI POWER CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0004] The Venturi flowmeter requires uniform air velocity distribution at the throat, but due to the compact overall size of the EGR pipeline, the EGR pipeline upstream of the Venturi flowmeter is a bent pipeline, resulting in a significant deviation of the gas flow entering the Venturi flowmeter nature, and the degree of turbulence is high, which has an adverse effect on the measurement accuracy of the Venturi flowmeter

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  • A Venturi Flowmeter
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Embodiment Construction

[0035] The invention discloses a venturi flowmeter to improve the measurement accuracy of the venturi flowmeter.

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] see Figure 1-Figure 5 .

[0038] The invention discloses a venturi flowmeter, which includes a casing 1 and a venturi tube 2 . The casing 1 is provided with a cylindrical cavity, and the cylindrical cavity is adapted to the shape of the outer wall of the Venturi tube 2, and the Venturi tube 2 is installed in the...

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Abstract

The invention discloses a Venturi flowmeter, which comprises a casing, a Venturi tube and a flow distribution assembly, and the flow distribution assembly is located upstream of the Venturi pipe. When the Venturi flowmeter is working, the airflow from the EGR pipeline passes through the splitter assembly and then enters the Venturi tube. The Venturi flowmeter disclosed in this proposal adds a shunt assembly. The turbulent gas will push the paddle to rotate, and the rotation of the paddle will divide the hole of the ring support frame for the passage of gas into two parts to realize the shunting of the gas, and the turbulent gas will be reacted by the paddle, and the impact of the paddle will collide with the paddle. Part of the gas will be diverted to the side of the ring support frame where the paddle is not provided, so as to redistribute the air flow. The Venturi flowmeter disclosed in this proposal can effectively offset the influence of the bent pipe of the EGR pipeline on the airflow deflection, optimize the velocity distribution of the airflow entering the Venturi flowpipe, thereby improving the measurement accuracy of the Venturi flowmeter.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a venturi flowmeter. Background technique [0002] Engine emission regulations are becoming more and more stringent, and EGR (exhaust gas recirculation) technology has become one of the technologies commonly used in engines today. [0003] The EGR rate is the ratio of the amount of recirculated exhaust gas to the total amount of intake air drawn into the cylinder. The reasonable control of the EGR rate is extremely important for the purification effect of nitrogen oxides and the emission of the whole machine. The control of the EGR rate also becomes the control of engine pollutants. Critical to emissions, the accuracy of EGR flow measurement determines the accuracy of EGR rate control. [0004] The Venturi flowmeter requires uniform airflow velocity distribution at the throat. However, due to the compact overall size of the EGR pipeline, the EGR pipeline upstream of the Venturi ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/44G01F15/08G01F15/18
CPCG01F1/44G01F15/08G01F15/18
Inventor 李卫潘洁袁志玲王雪鹏李云刚史孝华刘涛
Owner WEICHAI POWER CO LTD
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