Abstract: A turbine fuel pump includes an impeller having blades, each including a linear blade portion extending linearly in the radial direction of the impeller and a curved blade portion extending circularly curvedly from the head of the linear blade portion to the forward side of the impeller as viewed in the direction of rotation of the impeller. The linear blade portion has a length of (? to ?)×H, where H is an overall length of the impeller.

Abstract: A check valve includes a housing formed with a valve hole through which fluid flows, a valve seat formed on the peripheral wall of the valve hole, a valve element disposed in the valve hole to be movable between a valve closed position where the valve element makes close contact with the valve seat to close the valve hole and a valve open position where the valve element moves away from the valve seat in the downstream direction to open the valve hole, a coil spring for biasing the valve element toward the valve closed position wherein the coil spring is larger in outer diameter than valve element, and a pressure acting portion provided to the coil spring so as to undergo the pressure of fluid.

Abstract: A turbine fuel pump includes: a casing for casing an electric motor; a pump housing disposed at the casing, and an impeller rotatably disposed in the pump housing. The pump housing includes a fuel passage between an intake port and a delivery port. The fuel passage includes a flow path defining a cross section S. The impeller has an outer periphery formed with a vane which force feeds the fuel in the fuel passage when the impeller is rotated with the electric motor. The vane defines a height H and a thickness T. The fuel passage defines the following typical dimension Rm: Rm=S/(2H+T). A wall of the flow path defining the cross section S is profiled by a profile length Lp. The profile length Lp divided by the typical dimension Rm makes a dimension ratio Lp/Rm in a first range from 11 to 16.

Abstract: A turbine fuel pump including a cylindrical casing, an electric motor accommodated in the casing, a pump housing mounted into the casing, and an impeller disposed within the pump housing and driven around an axis in a rotational direction by the electric motor. The impeller includes a plurality of vanes each formed into a generally rectangular plate including a tip end face that extends circumferentially to define an outer peripheral surface of the impeller, and front and rear faces respectively located on forward and rearward sides in the rotational direction of the impeller. The front face is curved such that a tip end portion thereof is positioned forwardly in the rotational direction of the impeller relative to a root portion thereof. A chamfer portion disposed between the tip end face and a tip end portion of the front face.

Abstract: A turbine fuel pump includes an impeller having blades, each including a linear blade portion extending linearly in the radial direction of the impeller and a curved blade portion extending circularly curvedly from the head of the linear blade portion to the forward side of the impeller as viewed in the direction of rotation of the impeller. The linear blade portion has a length of (⅓ to ⅔)×H, where H is an overall length of the impeller.

Abstract: A turbine fuel pump includes: a casing for casing an electric motor; a pump housing disposed at the casing, and an impeller rotatably disposed in the pump housing. The pump housing includes a fuel passage between an intake port and a delivery port. The fuel passage includes a flow path defining a cross section S. The impeller has an outer periphery formed with a vane which force feeds the fuel in the fuel passage when the impeller is rotated with the electric motor. The vane defines a height H and a thickness T.