Patent ID: 7854111
Filing Date: 2010-12-21
Classification: F04C

Abstract:
1. An axial flow positive displacement turbine comprising: a relatively high pressure inlet axially spaced apart and upstream from a relatively low pressure outlet, a rotary assembly including an inner body disposed within an outer body and the inner and outer bodies extending from the inlet to the outlet, the inner and outer bodies having offset linear inner and outer axes respectively, at least one of the inner and outer bodies being rotatable about a corresponding one of the inner and outer axes, the inner and outer bodies having intermeshed inner and outer helical blades wound about the inner and outer axes respectively, the inner helical blades extending radially outwardly from an annular inner hub of the inner body, the outer helical blades extending radially inwardly from an annular outer shell of the outer body, the inner hub and the outer shell being circumscribed about the inner and outer axes respectively, the inner and outer bodies have inner and outer numbers of inner and outer helical blades respectively, and the inner and outer numbers of the inner and outer helical blades being two or more and the number of outer helical blades being one more or one less than the number of inner helical blades.