Circumferential flow pump

Abstract

A circumferential flow pump in which the quantity of swelling by alcohol or toluene contained in fuel, is curbed and an impeller thereof is prevented from locking is provided. A circumferential flow pump for feeding into an internal combustion engine, fuel from the fuel tank thereof includes an impeller, made of fiber-reinforced PPS, having a base portion fitted to a motor rotor, a vane portion provided outer-circumferentially on the base portion, and an outer ring portion provided outer-circumferentially on the vane portion; the vane portion is composed of a plurality of vanes arranged radially protruding straightly from the base portion and each vane includes a bend thereon; and furthermore, given that a projected area of the entire vane portion is S 1 , that of the ring portion, S 2 , that of the base portion, S 3 , when the impeller, is projected from a direction along a motor shaft of the motor rotor, the ratio of S 3 to S 1 is made to fall between 9:1 to 15:1, and the ratio of S 2 to S 1 is made to fall between 0.10:1 to 0.13:1.

1 . A circumferential flow pump that feeds into an internal combustion engine, fuel from a fuel tank, including:
 a disc-shaped impeller fitted to a motor rotor, and   a pump-housing for housing the impeller; characterized in that the impeller is made of fiber-reinforced polyphenylene sulfide and comprises:   a base portion fitted to the motor rotor,   a vane portion provided outer-circumferentially on the base portion, and   an outer ring portion provided outer-circumferentially on the vane portion; and the vane portion comprises a plurality of vanes arranged radially protruding straightly from the base portion and each vane includes a bend; and furthermore, given that a projected area of the entire vane portion is S 1 , that of the ring portion, S 2 , that of the base portion, S 3 , when the impeller is projected from a direction along a motor shaft of the motor rotor, the ratio of S 3  to S 1  is made to fall between 9:1 and 15:1, the ratio of S 2  to S 1  is made to fall between 0.10:1 and 0.13:1.