Fuel pump
AssigneeDenso Corporation
InventorsTadashi Hazama, Eiji Iwanari, Kenichi Tomomatsu
Life of this patent
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Abstract
A fuel pump includes a rotatable impeller having a plurality of blades and blade ditches on the periphery thereof, a motor section for driving the impeller, and a casing member which accommodates the impeller and has at least one fuel passage along an outer periphery of the impeller. The fuel passage communicates with the blade ditches. Moreover, a radially-inside inner surface of the fuel passage, with respect to an axis of rotation of the impeller, from a centerline on a bottom of the fuel passage to a radially inside edge of the fuel passage is formed as an approximately quadrant curved surface.
Claims11
A fuel pump comprising;
- a rotatable impeller having a plurality of blades and blade ditches on the periphery thereof;
- a motor section for driving the impeller;
- and
- a casing member which accommodates the impeller and has at least one fuel passage along an outer periphery of the impeller;
- wherein:
- the fuel passage communicates with the blade ditches;
- a distance along an inner surface from a centerline at a bottom of the fuel passage to a radially inside edge of the fuel passage, with respect to an axis of rotation of the impeller, is shorter than a distance from said centerline to a radially outside edge of the opening of the fuel passage, diametrically opposite said inside edge;
- two fuel passages are provided, one disposed axially on each side of the impeller;
- an outside diameter D of the impeller and a thickness t of the impeller are set to satisfy the condition expression that the value of D/t is equal to or less than 8.4;
- and
- distances L1, L2 from the center of the impeller with respect to the thickness direction to the bottoms of the fuel passages and the thickness t of the impeller are set to satisfy the condition expression that the value of t/2 is equal to or more than both (L1)/2 and (L2)/2.
A fuel pump comprising;
- a rotatable impeller having a plurality of blades and blade ditches on the periphery thereof;
- a motor section for driving the impeller;
- and
- a casing member which accommodates the impeller and has two fuel passages along an outer periphery of the impeller;
- wherein:
- the two fuel passages are disposed axially on both sides of the impeller, respectively;
- an outside diameter D of the impeller and a thickness L of the impeller are set to satisfy the condition expression that the value of D/t is equal to or less than 8.4;
- distances L1, L2 from the center of the impeller with respect to the thickness direction to the bottoms of the fuel passages and the thickness t of the impeller are set to satisfy the condition expression that the value of t/2 is equal to or than both (L1)/2 and (L2)/2;
- a rotating velocity of the impeller is in a range of 6000-8000 rpm;
- an amount of fuel discharged from the fuel pump can be equal to or more than 0.25 m3/h;
- and
- the outside diameter D of the impeller and the thickness t of the impeller are set to satisfy the condition expression that the value of D/t is equal to or less than 7.8.
Dependencies are inferred from the claim text.