DYNAMIC CHARACTERISTICS ANALYSIS FOR CLAW ROTOR OF VACUUM PUMP WITH CONSTANT AND VARIABLE LEADS

Minh-Thuan Hoang; The-Van Tran

Minh-Thuan Hoang Department of Mechanical Engineering, Hung Yen University of Technology and Education
The-Van Tran Department of Mechanical Engineering, Hung Yen University of Technology and Education

Keywords: sealing line, claw-type rotor, constant lead, variable lead, dynamic characteristics

Abstract

The dynamic characteristics and lead function of a conjugated rotors are the key influences on twin-screw rotor vacuum pump performance. However, the relationship between two factors is lacking in previous studies. Therefore, this study proposes a method for analyzing dynamic characteristics between two rotors of vacuum pump with constant and variable leads. The mathematical model of generated rotor profile based on the sealing line is applied to generate the 2-D rotor profile. And then the rotor surfaces with constant and variable leads are constructed. The dynamic characteristic of meshing rotors is evaluated by using the Adams software. The influence of dynamic characteristic of rotor pair on the function of rotor lead has been analyzed. The numerical examples are verified the merit of the constructed model.

References

M. Mito, M. Yoshimura, M. Takahashi, Dry screw vacuum pumps having nitrogen injection, Taiko Kikai Industries Co Ltd., Kumage-gun(JP), 2003, US Patent 6554593B2.

S.A. Ateliers Busch, U.F. Becher, Twin screw rotors and displacement machines containing the same, Porrentruy(CH), 2004, US Patent 6702558B2.

Z.H. Fong, F. C. Huang, Evaluating the interlobe clearance and determining the sizes and shapes of all the leakage paths for twin-screw vacuum pump. P. I. Mech. Eng. C-J. Mech. Eng. Sci., 2006, 220, pp. 499-506.

C.F. Hsieh, Y.W. Hwang, Z.H. Fong, Study on the tooth profile for the screw claw type pump. Mech. Mach. Theory., 2008, 43 (7), pp. 812–828.

C.F. Hsieh, A study of the geometric design and gas port of the claw-type rotor. P. I. Mech. Eng. C-J. Pro., 2009, 223(9), pp. 2063-2069.

J. Wang, Y. Song, X. Jiang., D. Cui, Y. Qu, An analytical model of claw rotor profiles and working process model with the mixing process for claw vacuum pumps. Vacuum, 2015, 114, pp. 66-77.

J. Wang, D. Cui, X. Pang, H. Feng, Z. Wang, Geometric design and performance analysis of a novel smooth rotor profile of claw vacuum pumps. Vacuum, 2017, 143, pp. 174-184.

Y.R. Wu, Z.H. Fong, Rotor profile design for the twin-screw compressor based on the normal-rack generation method. ASME J. Mech. Des., 2008, 130 (4), 042061.

M.T. Hoang, Y.R. Wu, Inter-lobe clearance estimation for twin-screw rotor pairs with pointmeshing features. P. I. Mech. Eng. E-J. Mech. Eng. Sci., 2021, Vol. 235(2), pp. 1-11.

T.L. Nguyen, Y.R. Wu, A Novel Rotor Profile Generation Method for Claw-Type Vacuum Pumps Based on Sealing Line. Appl. Mech. Mater., 2019, 894, pp. 34-40.

M.T. Hoang, Y.R. Wu, T.L. Nguyen, A universal rotor design method for twin-rotor fluid machines with a parameterized sealing line considering inter-lobe clearances. Vacuum, 2021, 189, p. 110276.

F.L. Litvin, A. Fuentes, Gear geometry and applied theory. 2th ed. Cambridge University Press, 2004.