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Double -rotator flow meter
Product Description
Helical double-rotor flow meter is a kind of new positive displacement flow meter in the world at present, in which a pair of helical double rotors with special tooth shape is used in the measuring part. It is provided with remarkable characteristics such as high reliability, high accuracy, large flowrate, no pulsation, low noise and strong applicability to fluids; therefore, it is widely applicable to the commercial metering in such industries as petroleum, chemical, power, metallurgy and traffic, etc.
Characteristics
High accuracy, large flowrate, wide flow range, good repeatability;
Smooth running, no flowrate pulsation, low noise;
Insensitivity to viscosity change of measured medium, and therefore is particularly applicable to metering of high viscosity fluids;
Simple structure with two rotors without the need for guide gear;
Remote measurement and control can be achieved by using it together with photoelectric transmitter and intelligent controller;
Easy installation no need for straight pipe section before and after flow meter.
Working Principle
Helical rotor flow meter is a positive displacement flow meter, which directly engages by means of a pair of rotors with four teeth in big helix angle and relevant direction of rotation, and makes use of rotation to measure liquid flowrate. There is no relative sliding motion between rotors; the pressure difference between the inlet and outlet of fluid drives the rotors rotating. A force driving rotor to rotate can only drive rotor turning a certain angular degree in the same plane, but in the view of three dimension, two helical rotors can obtain rotary forces shown as the figure below on different stratification planes in any rotating position, and the rotary forces applied on each same rotation angle of two rotors are basically equivalent (see figure a, b, c and d). Consequently, the rotors rotate in constant speed and constant torque, and the displacement is uniform without pulsation. The displacement is the volume of a space formed by rotor teeth slot and housing, 8 times of space volume will be discharged out for every revolution of rotor; therefore, the total volume discharged can be calculated by adding up the revolution of rotor.
| DN (mm) | 15-400mm |
| Accuracy | 0.1%,0.2%,0.5% |
| Pressure loss | 0-1000Mpas less than 80Kpa |
| Working pressure | 1.6,2.5,4.0,6.3,10,16,20,42Mpa |
| Temperature range (centigrade) | -40 to +80,-40 to +150,-40 to +250, -40 to +350 |
| Medium viscosity | 0.1-1000Mpa.s |
| Ambient conditions | Temp.-30 to +70, Humidity 5%-95%, Atmosphere 86Kpa-106Kpa |
| Protection level | Intrinsic safety and explosion-proof |
| Ex-proof grade | PDF Book IaII CT4, Isolation dII BT4 |
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