Product introduction of flow meter

The English name of flowmeter is flowmeter, which is defined by the national science and technology terminology Approval Committee as an instrument indicating the measured flow and / or the total amount of fluid within the selected time interval. Simply put, it is an instrument used to measure the fluid flow in pipelines or open channels.

Flow meters are also divided into differential pressure flow meters, rotameters, throttling flow meters, slit flow meters, volumetric flow meters, electromagnetic flow meters, ultrasonic flow meters, etc. Classification by medium: liquid flowmeter and gas flowmeter.

Product introduction of flow meter

Measurement is the eye of industrial production. Flow measurement is one of the components of measurement science and technology. It is closely related to national economy, national defense construction and scientific research. Doing this work well plays an important role in ensuring product quality, improving production efficiency and promoting the development of science and technology. Especially in today's era of energy crisis and increasing automation of industrial production, the position and role of flowmeter in the national economy are more obvious.

The commonly used unit in engineering is m3 / h, which can be divided into instantaneous flow rate and total flow. Instantaneous flow refers to the amount passing through the effective section of closed pipeline or open channel in unit time, and the substances flowing through can be gas, liquid and solid; Cumulative flow refers to the cumulative amount of fluid flowing through the effective section of closed pipeline or open channel in a certain time interval (one day, one week, one month, one year). The cumulative flow can also be obtained by integrating the instantaneous flow with time, so the instantaneous flowmeter and cumulative flowmeter can also be transformed into each other.

Development history of flow meter

As early as 1738, Swiss Daniel Bernoulli used differential pressure method to measure water flow based on the first Bernoulli equation. Later, the Italian G.B. venturi studied measuring flow with venturi tube, and published the research results in 1791.

In 1886, American Herschel made a practical measuring device for measuring water flow by using venturi tube.

From the early to the middle of the 20th century, the original measurement principle gradually matured. People no longer limited their ideas to the original measurement methods, but began a new exploration.

In the 1930s, the method of measuring the flow rate of liquid and gas by sound wave appeared, but the method of measuring the flow rate by sound wave did not make great progress until the Second World War. It was not until 1955 that the Maxon flowmeter using sound circulation method was invented to measure the flow of aviation fuel.

After the 1960s, measuring instruments began to develop in the direction of precision and miniaturization.

With the rapid development of integrated circuit technology, ultrasonic (wave) flowmeter with phase-locked loop technology has also been widely used. The wide application of microcomputer has further improved the ability of flow measurement. For example, laser Doppler flowmeter can process more complex signals after the application of microcomputer.