Patent ID: 6394777
Filing Date: 2002-05-28
Classification: F04C

Abstract:
A rotary screw pump comprising:a casing that includes an inlet and an outlet; first and second intermeshing screw members rotatably mounted within the casing configured to (1) draw a first fluid from the inlet, (2) transport the first fluid to the outlet, and (3) expel the first fluid through the outlet, wherein the first fluid undergoes compression that generates heat at the outlet side of the casing; first and second shaft portions connected to the first and the second screw members, respectively, and that extend out from the outlet side of the casing; a first cavity within the first screw member and the first shaft portion; and a second cavity within the second screw member and the second shaft portion, wherein the first and the second cavities are sealed and include a second fluid for transferring the heat generated during compression to the first and second shaft portions.