Abstract
The measurement of the flow rate of various liquids and gases is critical in industrial automation. Rotary positive displacement meters (rotary PD meters) are highly accurate flowmeters that are widely employed in engineering applications, especially in custody transfer operations and hydraulic control systems. This paper presents a high pressure rotary PD meter containing a pair of internal cycloid rotors. It has the advantages of concise structure, low pressure loss, high accuracy and low noise. The curve of the internal rotor is designed as an equidistant curtate epicycloid curve with the external rotor curve as its conjugate. The calculation method used to determine the displacement of the cycloid rotor flowmeter is discussed. A prototype was fabricated, and experiments were performed to confirm measurements over a flow range of 1–100 L/min with relative errors of less than ±0.5%. The pressure loss through the flowmeter was about 3 bar at a flow rate of 100 L/min.
Highlights
Flow rate is one of the most important parameters in industrial automation, and flowmeters are the most widely used instruments for measuring this parameter
The rotary PD meter is considered to have a high accuracy and robustness [3]. Due to their many advantages, such as good stability, insensitivity to upstream velocity distribution and fluid viscosity, easy maintenance, rotary PD meters are still widely employed in engineering applications, especially in custody transfer operations and hydraulic control system [4,5]
The sensor installed in the cycloid rotor flowmeter is working, the flow direction can be read from the sensor, and the flow rate can be calculated by recording the time during one pulse
Summary
Flow rate is one of the most important parameters in industrial automation, and flowmeters are the most widely used instruments for measuring this parameter. Like Coriolis mass flowmeters, have developed rapidly in recent decades, volumetric flowmeters still play a large part in all kinds of flow measurement scenarios [1,2,3]. The rotary PD meter is considered to have a high accuracy and robustness [3]. Due to their many advantages, such as good stability, insensitivity to upstream velocity distribution and fluid viscosity, easy maintenance, rotary PD meters are still widely employed in engineering applications, especially in custody transfer operations and hydraulic control system [4,5]. The flow-rate can be measured by monitoring the rotation speed of the rotors [6]
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