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Research Papers: Power Transmissions and Gearing

Rotor Profile Design for the Twin-Screw Compressor Based on the Normal-Rack Generation Method

[+] Author and Article Information
Yu-Ren Wu

Department of Mechanical Engineering, National Chung-Cheng University, No. 168, University Road, Min-Hsiung, Chia-Yi 621, Taiwan, R.O.C

Zhang-Hua Fong

Department of Mechanical Engineering, National Chung-Cheng University, No. 168, University Road, Min-Hsiung, Chia-Yi 621, Taiwan, R.O.Cimezhf@ccu.edu.tw

J. Mech. Des 130(4), 042601 (Mar 05, 2008) (8 pages) doi:10.1115/1.2839003 History: Received November 01, 2006; Revised April 03, 2007; Published March 05, 2008

This paper proposes a method for designing the rotor profiles of twin-screw compressors using a rack defined in the normal plane. All tooth profile segments are explicitly defined as tangent continuous in the normal section to generate a pair of conjugated rotors. Numerical comparisons between the two types of screw rotor tooth profile design, one based on a normal system, the other on an axial system, show the advantages of using the normal-rack generation method (NRGM). Most particularly, this method allows the same hob used for screw rotors to be used to manufacture mating rotors even as the helix angle varies, because in a normal system the circular pitch remains the same. The numerical results also indicate that the rotor tooth thickness generated by the NRGM rack cutter can prevent serious deflection for a variety of helix angles and tooth combinations.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Rack cutter and its corresponding male and female rotors

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Figure 2

NRGM rack and its functional control parameters

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Figure 3

Generation principle for the normal equidistant trochoids of the NRGM rack

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Figure 4

Coordinate systems for profile generation based on NRGM

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Figure 5

Rotor profiles, meshing line, contact line, and blow hole based on the NRGM

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Figure 6

Coordinates of helical rack, hobbing tool, and (left-hand) rotor

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Figure 7

Rotor pairs with different helix angles: (a) 46deg; (b) 56deg

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Figure 8

Rotor pairs with different tooth combinations: (a) 5∕6; (b) 6∕7

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Figure 9

NRGM rotor profiles with different helix angles: normal system

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Figure 10

Rack and rotor profiles: axial system

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Figure 11

Rotor profiles in a normal section: (a) normal system; (b) axial system

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Figure 12

NRGM rotor profile with 4∕6 tooth ratio, short tooth, and shifted profile

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