Leakage Characteristics of Gas Screw Seals

Document Number: 861836

Date Published: October 1986

Author(s):
Kunihiro Miyake - Div. of Mechanical, Transportation Engineering, The Institut
Eiichi Watanabe - Div. of Mechanical, Transportation Engineering, The Institut
Ichiro Ariga - Faculty of Science and Technology, Keio University, Japan

Abstract:
Leakage characteristics of the screw gas seal having a rectangular screw groove on a shaft were investigated by varying the peripheral velocity up to 250 m/s and by using room temperature air.

The various effects of helix angle, groove width ratio, aspect ratio, number of threads, etc. were examined both in stationary and rotating states.

As a result, it was found that the seal performance was optimized by using a dimensionless parameter, the ratio of the cross sectional areas of screw groove to screw rotor. Thus the seal performance was optimized when this parameter was nearly equal to 1 x 10\u-\u3 or when the cross-sectional area of screw groove became nearly 0.1% of the cross-sectional area of screw rotor. The effects of aspect ratio, helix angle, groove width ratio and number of threads on the seal performance appear to be relatively unimportant.

File Size: 588K
Product Status: In Stock

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