Patent ID: 6729841
Filing Date: 2004-05-04
Classification: F01D

Abstract:
A turbine pump comprising:a casing having an inlet, an outlet and front and rear arc-shaped pump passages; an impeller disposed in said casing, said impeller having a plurality of blades disposed in the circumferential direction thereof, a plurality of impeller partitions respectively disposed between every two of said blades thereby forming a plurality of impeller grooves at front and rear sides of said partitions and an outer ring disposed at a peripheral edge of said blades and radially more outside than an axially innermost portion of said impeller grooves to connect said blades all together; wherein each of said impeller grooves, each of said pump passages and said outer ring form a space for circulating fuel pumped up from said inlet thereby pressuring and discharging said fuel from said outlet; wherein the outside diameter of said impeller is smaller than the outside diameter of said pump passages so that peripheral portion of said impeller is disposed within said pump passages; and wherein said outer ring has a trapezoidal cross section with a shorter side thereof being radially inward.