Research Papers

Design of the Curved Flank for the Star-Wheel Tooth in Single Screw Compressors

[+] Author and Article Information
Weifeng Wu

School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: Weifengwu@mail.xjtu.edu.cn

Xiuqing Hao

School of Mechanical Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: sunnie.168@163.com

Zhilong He

School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: zlhe@mail.xjtu.edu.cn

Jian Li

Nanjing Tica Air-Conditioning Co., Ltd,
Nanjing 210046, China
e-mail: lijianxjtu@gmail.com

1Corresponding author.

Contributed by the Power Transmission and Gearing Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received June 29, 2013; final manuscript received February 7, 2014; published online March 21, 2014. Assoc. Editor: Zhang-Hua Fong.

J. Mech. Des 136(5), 051006 (Mar 21, 2014) (5 pages) Paper No: MD-13-1279; doi: 10.1115/1.4026870 History: Received June 29, 2013; Revised February 07, 2014; Accepted February 13, 2014

The wear of star-wheel teeth is an important problem in single screw compressors. In order to prolong the service life of star wheels, a new curved flank of the tooth is proposed. Section profile of the tooth flank is a curve, which could be elliptical, hyperbolic, involute, or new defined. The screw groove flank is the envelope surface corresponding to the surface of the tooth flank. During the tooth meshing with the groove, the contact line moves in the tooth flank area.

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Fig. 1

Basic components of a typical single screw compressor

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Fig. 2

Different meshing pair profiles of star wheels: (a) straight line profile, (b) column profile, (c) multilines profile, and (d) multicolumns profile

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Fig. 3

Section view of the tooth flank at the tooth top: (a) straight line profile and (b) column profile

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Fig. 4

Geometric and kinematic relations between the star wheel and the screw rotor

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Fig. 5

A curved line of a star-wheel tooth

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Fig. 6

A new designed tooth flank

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Fig. 7

The ellipse in S2 coordinate system

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Fig. 8

Section views of the elliptic tooth flank (Hatch lines of the tooth sections are hidden for clarity): (a) δ = 0 deg, l = 1.3 mm, (b) δ = 10 deg, l = 1.8 mm, (c) δ = 20 deg, l = 2.7 mm, (d) δ = 30 deg, l = 3.8 mm, and (e) δ = 40 deg, l = 4 mm




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