Small elliptical gear flowmeter| Ultrasonic flowmeter TDS manufacturer

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1. Structure of Positive Displacement Flow Meter

In order to meet the requirements of various media and working conditions for flow measurement in production, various types of positive displacement flow meters have been developed. Among them, the more common types are gear type, scraper type, and rotary piston type. Now they are introduced as follows. Volumetric flowmeter (also known as Obal volumetric flowmeter) The schematic diagram of the elliptical gear flowmeter in Figure 1 shows that the flowmeter works by two elliptical gears meshing with each other. The working process is briefly described as follows: P1 in the figure represents the inlet fluid pressure of the flowmeter; Indicating the outlet fluid pressure, it is evident that the pressure P1 is greater than P2. In Figure 1 (a), although the lower travel mold surface rotor is disassembled and slowly subjected to the pressure difference of the fluid, it does not generate rotational torque, while the upper gear generates rotational torque and rotates under the differential pressure of two examples. Due to the meshing of the two gears, they rotate in the direction of the arrow around O1 and O2 as the axis, and at the same time, gear O1 discharges the fluid in the half moon shaped measuring space to the outlet. In the state of Figure 1 (a), the upper gear is the driving wheel and the lower gear is the driven wheel. In the position of Figure 1 (b), both gears generate rotational torque under the differential pressure of the fluid and rotate in the direction of the arrow under this torque, transitioning to The position shown in Figure 1 (c). At this point, the gear position is the same as Figure 1 (a) On the contrary, the lower gear is the driving wheel and

the upper gear is the driven wheel. The lower gear rotates under the differential pressure of the inlet and outlet fluids, and once again discharges the fluid in the half moon shaped "measuring space" between it and the housing. With this continuous motion, the elliptical gear discharges four volumes of fluid in the "measuring space" for each revolution. Therefore, as long as the number of revolutions of the gear is read, the amount of liquid discharged can be calculated. Referring to Figure 2-2, the total amount of fluid discharged can be calculated as V=4nv, where n - the number of rotations of the gear; a. B - The long half sleeve and short half sleeve of the elliptical gear; δ-- The thickness of the elliptical gear. Another type of gear type volumetric flowmeter is the waist wheel volumetric flowmeter, also known as the Roots type volumetric flowmeter. The working principle and process of this flowmeter are basically the same as those of the elliptical gear type, which relies on the pressure difference between the inlet and outlet fluids to generate motion, and discharges four volumes of fluid in the "normal and simple measurement space" for each rotation. The difference is that there are no teeth on the waist wheel, and they do not directly mesh with each other for rotation, but are transmitted through a transmission gear set installed outside the housing. The above two types of rotor type volumetric flowmeters can be used for measuring various liquid flow rates, especially for accurate measurement of oil flow rates. In high-pressure and high flow gas flow measurement, this type of flowmeter is also applicable. Due to the fact that the elliptical gear volumetric flowmeter directly relies on the meshing of the measur

Small elliptical gear flowmeter

1. Structure of Positive Displacement Flow Meter

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