Study on Scroll Profile based on Algebraic Spiral for Scroll Fluid Machines

Abstract

The scroll wrap profile is very important for improving performance and reliability of scroll fluid machines. An involute curve of a circle is gerally used in current scroll compressors. In this paper,we have adopted an algebraic spiral (r=aΦ^k)as the basic volute curve of the scroll wrap profiles,and described its geometric shape and volume characteristics. The advantages of using the algebraic spiral as the basic volute curve are as follows. (1)The scroll wrap thickness can gradually be changed with the wrap angle,and can be changed according to the strength requirement. (2)Scroll wrap dimensions can be reduced to some extent than those with an involute curve under the same design conditions. (3) The top clearance volume can be reduced or brought to zero.