Screw pumps
AssigneeThe BOC Group, Inc.
InventorsNigel Paul Schofield, Michael Henry
Life of this patent
Estimating the term…
Abstract
A screw pump has two parallel shafts mounted in a pump body, each shaft thereon and each rotor has at least one helical vane or thread. When the helical vanes or threads intermesh causing a fluid to be pumped from an inlet towards an outlet of the pump. The bearings associated with each shaft are being positioned in cavities within the first and second rotors which are sealed at their ends closest to the pump inlet. A thermal shield is provided between the bearing arrangements and the internal cavity surfaces.
Claims9
A screw pump comprising a first shaft spaced from and parallel to a second shaft mounted in a pump body, a first rotor mounted on the first shaft and a second rotor mounted on the second shaft, each rotor having formed on an outer surface at least one helical vane or thread, the helical vanes or threads intermeshing together so that rotary movement of the shafts will cause a fluid to be pumped from an inlet towards an outlet of the pump, a first bearing arrangement associated with the first shaft and a second bearing arrangement associated with the second shaft, first and second bearing arrangement being positioned in cavities within the first and second rotors respectively which are sealed at their ends closest to the pump inlet wherein a thermal shield is provided between the bearing arrangements and the internal cavity surfaces.
Dependencies are inferred from the claim text.