Back to results
US 2003/0152475 A1Published application
Twin screw rotors and displacement machines containing the same
AssigneeAteliers Busch SA
InventorUlrich F. Becher
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeAteliers Busch SA
InventorUlrich F. Becher
Estimating the term…
The twin screw rotors for axis-parallel installation in displacement machines for compressible media have asymmetrical transverse profiles and numbers of wraps that are ≧2. Depending upon the wrapping angle (α), the pitch (L) varies, which pitch increases in a first subdivision (T1) from the suction-side screw end, reaches a maximal value (Lmax) after one wrap, decreases in a second subdivision (T2) until a minimal value (Lmin), and is constant in a third subdivision (T3). The pitch course in the first subdivision (T1) is preferably mirror-symmetrical to that in the second subdivision (T2), within the subdivisions T1 to T2, it is point-symmetrical to the mean values in almost all cases. Compact screw rotors, completely free of imbalance, can thereby be achieved with compression rates of 1.0 . . . 10.0, also without profile variation. Such rotors offer the best prerequisites for reduction in energy requirements, temperature, construction size, costs, as well as for free selection of working materials in applications in chemistry, pharmacy, packaging, and semiconductor technology.
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 ≧2 and with pitch (L) varying depending upon the wrapping angle (α), which pitch increases from the suction-side screw end in a first subdivision (T1), reaches a maximal value (Lmax) at α=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.
Dependencies are inferred from the claim text.