Clearance and Leakage Analysis of a Liquid Pump with Claw Rotors

• Main Authors: Ling-Yu Kung, 龔玲玉
• Other Authors: 鍾添東
• Format: Others
• Language: en_US
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/67368260875923223921

碩士 === 國立臺灣大學 === 機械工程學研究所 === 99 === The claw type rotors have been widely used in many industries, such as liquid pumps, vacuum pumps, and compressors. Volumetric efficiency of two matching rotors depends on the two rotor profiles, and hence influences the pump efficiency. Another important factor that reduces the pump efficiency is the leakage due to pressure difference between two adjacent cavities, and also clearances between two rotors and the chamber wall. The mathematical model of the claw rotor profile is presented to describe the meshing condition and calculate the clearance between rotors by numerical method. The leakage flow rate and the effect of design parameters on total flow rate are investigated. Moreover, to avoid undercutting, the appropriate ranges of design parameters for the driving rotor profile are also derived. Finally, an optimization procedure for finding the best claw rotor parameters is presented with the total flow rate as the object function and sizes of design parameters as constraints. A computer program for performing above-mentioned calculation is developed to fulfill the research requirement of claw rotor pumps.