Flow channel structure of airflow ultrasonic flowmeter

Abstract

The invention discloses a flow channel structure of an airflow ultrasonic flowmeter. The flow channel structure comprises a main body, an upper cover body and a lower cover body; an inlet flow channeland an outlet flow channel are formed in the left side wall and the right side wall of the main body respectively; a measuring column body for separating the inlet flow channel from the outlet flow channel is also arranged in the main body; an upper buffer cavity and a lower buffer cavity are formed in the upper cover body and the lower cover body respectively; the inlet flow channel is communicated with the lower buffer cavity; the outlet flow channel is communicated with the upper buffer cavity; a measuring flow channel is formed in the measuring column body; the two ends of the measuring flow channel are communicated with the upper buffer cavity and the lower buffer cavity respectively; the length direction of the measuring flow channel is perpendicular to the air inlet direction of the inlet flow channel; a rectifier is arranged at the end, facing the lower buffer cavity, of the measuring flow channel; and airflow to be measured enters from the inlet flow channel, sequentially flows through the lower buffer cavity, the rectifier, the measuring flow channel and the upper buffer cavity and then flows out from the outlet flow channel. The flow channel structure has the advantagesthat the disturbance of a non-uniform flow field to measurement can be overcome without a long straight pipe section, and the measurement precision is improved.

Description

technical field [0001] The invention relates to the technical field of flowmeters, in particular to a channel structure of an airflow ultrasonic flowmeter. Background technique [0002] Ultrasonic flow meters are instruments that measure flow by detecting the action of fluid flow on ultrasonic beams (or ultrasonic pulses). Ultrasonic flowmeters are the same as electromagnetic flowmeters. Because the instrument flow channel is not equipped with any obstructions, they are all unobstructed flowmeters. They are a type of flowmeter suitable for solving difficult flow measurement problems, especially in large-diameter flow measurement. Therefore, it has a very wide range of applications in gas measurement such as natural gas, petroleum gas and coal gas. [0003] In the actual application process, due to the influence of valves, joints, etc., the flow rate of the gas is very uneven, and there are complex and changeable flow fields such as secondary flow, pulsating flow, and eddy c...

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Problems solved by technology

[0003] In the actual application process, due to the influence of valves, joints, etc., the flow rate of the gas is very uneven, and there are complex and changeable flow fields such as secondary flow, pulsating flow, and eddy current that seriously affect the propagation of sound waves, thereby affecting the measurement. Therefore, it is necessary to add a long straight pipe section in front of the flowmeter to ensure the stability of the flow field. However, in most cases, due to the limited space on site, it is often impossible to ensure that there is a sufficient length of straight pipe section, resulting in the measurement of the flowmeter. The accuracy of the data is not high

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