Vortex shedding flowmeter and acoustic sensor thereof

Abstract

The invention discloses a vortex shedding flowmeter and an acoustic sensor thereof. The vortex shedding flowmeter comprises a measuring head which is provided with a first sound leading channel and a second sound leading channel. An inlet of the first sound leading channel is located in a wall of a fluid channel. An outlet of the first sound leading channel is connected with the acoustic sensor. The acoustic sensor comprises a first sound wave collecting pin abutted with the outlet of the first sound leading channel and a second sound wave collecting pin abutted with the outlet of the second sound leading channel, and comprises first and second sound wave sensors which respectively receive sound wave signals collected by the two sound wave collecting pins correspondingly and are arranged back to back to evenly eliminate sound wave interference signals in the fluid channel collected by the first sound wave collecting pin in the first sound leading channel. Interference of the sound wave interference signals collected by the first sound wave collecting pin in the fluid channel on the measuring result can be evenly eliminated through the offset effect of the two electret microphones so that the anti-interference capacity of the acoustic sensor and the vortex shedding flowmeter can be improved.

Description

Technical field [0001] The invention belongs to the technical field of flow measurement, and specifically relates to a vortex flowmeter. Background technique [0002] The vortex flowmeter uses the Karman vortex principle for flow measurement. Insert a flying streamline-shaped group of fluid into the pipe vertically, and as the fluid flows around the group of fluids, vortex separation occurs, forming a regular vortex column. The rotation direction of the vortex on the left and right sides is opposite. This vortex is called Carmen. The vortex street, where the group of fluids that produce vortex separation is called the vortex generator. The vortex flowmeter is a meter that measures the flow rate according to the relationship between the frequency of the vortex leaving the vortex generator and the flow rate. [0003] A Chinese utility model patent specification with the authorized announcement number CN201653463U discloses a vortex flowmeter, which includes a tubular casing with a ...

AI Technical Summary

Problems solved by technology

Its main disadvantage is poor resistance to contamination and can only be used to detect fluids at lower temperatures

Because of these problems, most of the practical vortex flowmeters use pressure-sensitive detection technology, but the pressure-sensitive method has the problems of low sensitivity and vibration resistance

Moreover, the heat-sensitive element and pressure-sensitive element in the above-mentioned heat-sensitive and pressure-sensitive measurement methods are easily affected by the water vapor in the air flow to be measured, and both are greatly affected by the external environment.

Images