(Elliptical gear flowmeter)

(rotameter)

The working principle is different: (1) Elliptical gear flowmeter consists of a metering box and a pair of elliptic gears installed in the metering box.

It forms a sealed first moon cavity with the upper and lower cover plates (it is not absolutely sealed due to the rotation of the gear) as the calculation unit of primary displacement. When the measured liquid enters the flowmeter through the pipeline, it is produced at the inlet and outlet.

The pressure difference drives a pair of gears to rotate continuously, and the liquid metered by the first month chamber is continuously transported to the outlet. The product of the number of revolutions of the elliptical gear and four times of each displacement is the total amount of liquid flow to be measured (see figure for principle).

The flowmeter is mainly composed of shell, counter, elliptical gear and coupling (magnetic coupling and axial coupling). (2) The main measuring elements of the rotameter are a conical glass tube vertically installed up and down and a float that can move up and down. When the fluid passes through the conical glass tube from bottom to top, a pressure difference is generated between the upper and lower parts of the float and between the floats.

It rises under the action of this pressure difference. When the rising force, buoyancy and viscous lift on the float are equal to the gravity of the float, the float is in an equilibrium position. Therefore, the flow rate of the fluid flowing through the glass rotor flowmeter and the float increases.

Degree, that is, it has a certain proportional relationship with the flow area of the glass rotor flowmeter, and the height of the float can be used as a measure of flow.

Different scope of application: elliptical gear flowmeter is suitable for occasions with large flow and high measurement accuracy, while rotor flowmeter is just the opposite.