Design of a New Fluid Pump with Helical Claw Rotors
Date Issued
2010
Date
2010
Author(s)
Wang, Hsin-Wei
Abstract
This thesis describes the study of an innovative helical claw rotor design for fluid pump. Firstly, the contour of the claw rotor pair is constructed and is set into parametric model, and the design variables which can lead to the required performance, such as flow rate, is determined by the parametric model. By the computer aided design program, the claw rotor model is obtained after inputting values of the design variables. Due to the pulsation problem caused by the discontinuous pumping flow, the helical design is applied to the rotor pair. Helical design can be considered as phase shifting an indefinite number of the cross-sections of the claw rotor pair and superimposing the discharge flow. Therefore, the discharge flow would become more continuous and the pulsation would be decreased. Taken the stress and bending torque caused by the unidirectional discharging flow of the helical claw rotor pump into consideration, the rotor pair which could make a two-way discharging process would be an ideal design. Then a curve-sided type helical claw rotor pair, which is the modification of the helical claw rotor pair, is designed. Next, a calculation program is proposed in order to analyze the performances of these claw rotor pump designs, and the conventional claw rotor pump can therefore be compared with the two helical designs. The analysis shows that the pumping flows of the helical claw rotor pump and the curve-sided type helical claw rotor pump are more continuous than the conventional design, which results in less flow pulsations and higher efficiencies. In conclusion, the helical designs of claw rotor fluid pump are worthy to develop.
Subjects
Rotary pump
claw rotor, helical rotor
parametric modeling program
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