Patent ID: 6702558
Filing Date: 2004-03-09
Classification: F04C

Abstract:
Twin screw rotors for axis-parallel installation in displacement machines for compressible media, with asymmetrical transverse profiles with eccentric center of gravity position as well as numbers of wraps &gE;2 and with pitch (L) varying depending upon the wrapping angle (&agr;), which increases from the suction-side screw end in a first subdivision (T1), reaches a maximal value (Lmax) at &agr;=0 after one wrap, decreases to a minimal value (Lmin) in a second subdivision (T2), and is constant in a third subdivision (T3), wherein static and dynamic balancing is achieved through calculated balancing of overall wrapping angle, defined pitch course and ratio of maximal pitch to minimal pitch, or is achieved at least 80% and is supplemented by changes in the geometry in the region of the screw ends.