Liu Tao

College of Mechano-Electronic

Engineering,

Lanzhou University of Technology,

Lanzhou 730050,China

Liu Zhenquan

College of Petrochemical Technology,

Lanzhou University of Technology,

Lanzhou 730050, China

Abstract: A modification of central profile with trigonometric curve is proposed based on the theory of engagement of scroll compressor. General modification equations for central profile of a pair of scrolls are given and various modification patterns are discussed. The equidistant method is employed to calculate the volume of a sealed chamber and a set of general equations is represented. Modification parameters affecting geometric and dynamic property of a scroll compressor are analyzed systematically, and the relations between them are accurately determined. The condition for transforming a trigonometric curve modification into an arc-curve modification is explained. The conclusions can also be applied to other scroll fluid machines.