Ultrasonic metering device

Abstract

The invention discloses an ultrasonic metering device, belongs to the technical field of meter, and solves the problem that an existing ultrasonic metering device cannot meet measurement accuracy requirement of small flows such as flow of a household gas meter. The ultrasonic metering device comprises a casing and a transducer arranged on the casing, wherein the casing is provided with a meteringpassage for fluid to pass through, and the casing forms an inflow section and a measuring section along the fluid flow direction. The transducer comprises a transmitting vibrator and a receiving vibrator, and the transmitting vibrator and the receiving vibrator are mounted on the same side of the measuring section, so that the propagation path of the ultrasonic wave is V-shaped. The flow area of the inflow section is S1, and the flow area of the measuring section is S2, wherein S2 is less than S1, so that the surface velocity of the fluid flowing through the measuring section and the flight time difference during the ultrasonic measurement is increased, thereby improving the measuring accuracy. The device particularly satisfies the measurement accuracy requirements of small flows.

Description

【Technical field】 [0001] The invention relates to the technical field of measuring meters, in particular to an ultrasonic measuring device in an ultrasonic measuring meter. 【Background technique】 [0002] Ultrasonic meters have been widely used as a speed meter for household natural gas metering. This kind of gas meter measures the fluid flow velocity through the flight time difference between the downstream flight time and the countercurrent flight time of ultrasonic waves in the fluid, and then obtains the fluid flow rate. . According to such a measurement principle, for the characteristics of the small flow rate of the domestic gas meter, increasing the time-of-flight difference when the small flow rate is measured will help improve the measurement accuracy of the small flow rate of the domestic gas meter. In addition, since the domestic natural gas medium contains pollutants such as fine particles, dust and dust, the inner wall of the fluid flow channel will accumulate ...

AI Technical Summary

Problems solved by technology

In addition, since the domestic natural gas medium contains pollutants such as fine particles, dust and dust, the inner wall of the fluid flow channel will accumulate pollutants after long-term use, which will affect the measurement accuracy. The arc groove, the arc groove has the function of gathering waves, so that most of the ultrasonic waves can be received after reflection, so as to improve the measurement accuracy, but in practical applications, fine particles, dust and dust in the gas, etc. Pollutants are more likely to accumulate in the arc groove, which will affect the measurement accuracy of the ultrasonic meter

Images