Venturi flow meter

A flowmeter and Venturi technology, applied in the field of Venturi flowmeters, can solve the problems of high degree of turbulence and adverse effects on the measurement accuracy of Venturi flowmeters, and achieve the effects of improving measurement accuracy, reducing pulse peaks, and avoiding measurement errors

Active Publication Date: 2020-05-12
WEICHAI POWER CO LTD
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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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Embodiment Construction

[0031] The invention discloses a Venturi flowmeter to improve the measurement accuracy of the Venturi flowmeter.

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0033] see Figure 1-Figure 4 .

[0034] The invention discloses a Venturi flowmeter, which includes a casing 1 and a Venturi tube 2 . The housing 1 is provided with a cylindrical cavity, which is adapted to the shape of the outer wall of the Venturi tube 2 , and the Venturi tube 2 is installed in the cylindrical cavity of the housing 1 .

[00...

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Abstract

The invention discloses a venturi flow meter. The venturi flow meter comprises a shell, a venturi tube and a premixing assembly. According to the venturi flow meter, the premixing assembly is added, gas enters a premixing shell of the premixing assembly with the large sectional area from an EGR pipeline. Gas flow area increases, gas pressure rapidly reduces, a pulse peak value of the airflow pressure is reduced, and a gentle pulse is formed, so that a measurement error caused by an overrange is avoided; as the gas flow is increased, the airflow disturbance degree aggravates ands the volume ofgas in the premixing shell is increased; a movable plate can move towards the direction close to an inner prismatic surface of the premixing shell and thus the sectional area of the premixing shell can be adjusted in real time according to the gas pressure to enlarge the volume of the premixing shell and increase the circulation area of gas in real time, so that gas of different flows can be reorganized, and the purposes of reducing the pulse peak value of gas flow pressure, forming gentle pulses and avoiding measurement errors caused by overrange are achieved.

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. [0003] The EGR rate is the ratio of the amount of recirculated exhaust gas to the total amount of intake air inhaled into the cylinder. 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. The key to emissions, the accuracy of EGR flow measurement determines the accuracy of EGR rate control. [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 ben...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/44G01F15/10
CPCG01F1/44G01F15/10
Inventor 李卫李云刚潘洁袁志玲王雪鹏史孝华张岩
Owner WEICHAI POWER CO LTD
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