The working principle of gear flowmeter | Which of the following flowmeters is most suitable for measuring the flow rate of paint（

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1. What is an elliptical flowmeter? Abstract: An elliptical flowmeter is a volumetric flowmeter with high accuracy, mainly suitable for flow measurement in the industrial field, especially for flow measurement of high viscosity media such as heavy oil and polyvinyl alcohol. The elliptical gear flowmeter consists of a sealed lunar cavity composed of a housing, a counter, an elliptical gear, and a coupling. When liquid enters, it will push the gear to rotate continuously due to pressure difference. The flow rate can be calculated by calculating the number of revolutions and displacement of the elliptical gear. Lets learn about the principle and usage of the elliptical flowmeter below.

1. What is an elliptical flowmeter? Elliptical gear flowmeter, also known as displacement flowmeter, is a type of volumetric flowmeter with high accuracy. It mainly uses mechanical measuring elements to continuously divide the fluid into a single known volume part without wear and tear, and measures the total flow volume based on the number of times the measuring chamber is filled and discharged with the fluid in that volume part. It is suitable for flow measurement work in industrial sectors such as chemical, petroleum, pharmaceutical, power, metallurgy, and food, especially for flow measurement of high viscosity media such as heavy oil, polyvinyl alcohol, and resin.

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2. Working principle of elliptical flowmeter: The structure of an elliptical flowmeter consists of a housing, a counter, an elliptical gear, and a coupling (divided into magnetic coupling and axial coupling). The specific principle is that the measuring box, a pair of elliptical gears inside the measuring box, and the upper and lower cover plates form a se

aled crescent shaped cavity. When the measured liquid enters the flowmeter through the pipeline, the pressure difference generated at the inlet and outlet drives the pair of gears to rotate continuously, continuously conveying the liquid measured by the crescent shaped cavity to the outlet. The product of the number of revolutions of the elliptical gear and each discharge is four times the total flow rate of the measured liquid, that is, the volume flow rate Q through the elliptical gear flowmeter is Q=4n υ 0. (n is the rotational frequency of the elliptical gear, and υ 0 is the volume of the half moon shaped part).

III. Instructions for using the elliptical gear flowmeter

1. Cleaning the pipeline: Close the front and rear shut-off valves of the instrument and let the liquid flow through the bypass pipe;

; If there is no bypass pipe, a short pipe should be installed at the instrument position instead.

2、 Exhaust gas: After the solid liquid is swept, there is still a lot of air left in the pipeline, which can damage the shaft and bearings if transported too quickly. Therefore, it is necessary to slowly increase the flow rate to allow the air to gradually overflow.

3、 Bypass pipe switching: When the liquid flow enters the instrument from the bypass pipe, slowly open valve A to allow the liquid to flow in the bypass pipe for a period of time, then slowly open valves B and C in sequence, and record the volume flow rate passing through. Operate in the reverse order as described above when closing.

4、 Calculate the fluid flow rate based on the measurement formula. When using an elliptical gear flowmeter, attention should also be paid to avoiding sudden changes in flow rate. Lubricating oil

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