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Research Papers

Geometric Design Investigation of Single Screw Compressor Rotor Grooves Produced by Cylindrical Milling

[+] Author and Article Information
Weifeng Wu

School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Chinawwf.jt@163.com

Quanke Feng, Xiaoling Yu

School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

J. Mech. Des 131(7), 071010 (Jun 25, 2009) (5 pages) doi:10.1115/1.3151802 History: Received July 02, 2008; Revised April 06, 2009; Published June 25, 2009

Cylindrical milling of a screw rotor groove in a single screw compressor has higher machining efficiency than turning. However, the screw groove bottom produced by the flat end of the milling cutter fails to mesh hermetically with the flat tooth tip due to the oversized clearance between them. The clearance forms two leakage paths leading to a compressed gas leakage. The shape of the path is roughly the same as that of two parallel oblate divergent nozzles in an inverse orientation. A mathematical simulation is presented for the surface profile of the screw groove bottom for a single screw compressor generated using several cylindrical milling cutters. The results contribute to improving the design of the meshing pairs in the single screw compressor.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Typical structure of a single screw compressor

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Figure 2

Kinematic relation between the cutter and the work-piece in the milling process

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Figure 3

Relative positions of the milling cutters and the tooth

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Figure 4

Contact lines of the end faces of the milling cutter when the rotation angle, ϕsw, is 0 deg

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Figure 5

Cross section of the tooth and the screw groove at the middle plane of the tooth thickness

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Figure 6

The clearance profile between the flat tooth tip and the screw groove bottom: (a) the clearance at the middle plane of the tooth thickness, (b) the clearance at the upper surface of the tooth, and (c) the clearance at the lower surface of the tooth

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Figure 7

Three-dimensional diagram of the clearance profile between the tooth and the screw groove bottom at ϕsw=0 deg

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