Patent ID: 7455496
Filing Date: 2008-11-25
Classification: F04D,Y10S

Abstract:
1. A turbine fuel pump, comprising: a casing for accommodating an electric motor; a housing provided to the casing, the housing comprising an annular passage between inlet and outlet ports; and an impeller rotatably arranged in the housing, the impeller comprising blades arranged on an outer periphery to extend in a radial direction of the impeller and feeding fuel through the passage while the blades are rotated by the electric motor, each blade including a plate body of substantially rectangular section, the plate body comprising a front face located on the forward side of the impeller, a rear face located on a rearward side of the impeller, and a pair of side faces located between the front face and the rear face, each blade comprising a chamfer arranged on the root side of the blade to extend in the radial direction of the impeller, the chamfer being obtained by slantly cutting a corner between the side face and the rear face of the blade, the chamfer having a predetermined overall length, wherein the predetermined overall length is (⅖ to ⅗)×L, where L is a radial length of the passage, wherein the chamfer comprises a root-side portion and a head-side portion, wherein the root-side portion has a substantially constant chamfer width and a predetermined length, and the head side portion has a chamfer width gradually reduced from a head of the root-side portion so as to achieve smooth connection between the rear face and the side face, wherein the predetermined length of the root-side portion is (⅕ to ⅘)×T, where T is the predetermined overall length of the chamfer.