Impeller for fuel pumps
A fuel pump for a vehicle comprises: a driving motor; an impeller having a substantially circular shape, the impeller being rotatable by operation of the driving motor; and a pump casing covered with a casing cover, the pump casing and casing cover together defining a central cavity for receiving the impeller rotatable therein, the pump casing and casing cover including a fuel inlet port and a fuel outlet port, the pump casing and casing cover each further including a circular groove formed along the surface thereof in respective fluid communication with the central cavity of the pump casing and casing cover. The impeller includes a plurality blades of generally V-shape cross-section disposed along an outer surface of the impeller with a plurality of blade grooves defined between the blades, the blade grooves in fluid communication with respective circular groove of the pump casing and casing cover, wherein each of the blades includes a fuel inlet blade portion disposed at an inner area of the blade grooves and a fuel outlet blade portion disposed at an outer area of the blade grooves, with a boundary portion disposed between the fuel inlet blade portion and the fuel outlet blade portion, in which a front surface angle and a rear surface angle of each of the fuel inlet blade portion and the fuel outlet blade portion respectively varies relative to the length of each of the blades.
1. A fuel pump for a vehicle, the fuel pump comprising:
a driving motor;
an impeller having a substantially circular shape, the impeller being rotatable by operation of the driving motor; and
a pump casing covered with a casing cover, the pump casing and casing cover together defining a central cavity for receiving the impeller rotatable therein, the pump casing and casing cover including a fuel inlet port and a fuel outlet port, the pump casing and casing cover each further including a circular groove formed along the surface thereof in respective fluid communication with the central cavity of the pump casing and casing cover;
wherein the impeller includes a plurality blades of generally V-shape cross-section disposed along an outer surface of the impeller with a plurality of blade grooves defined between the blades, the blade grooves in fluid communication with respective circular groove of the pump casing and casing cover;
wherein each of the blades includes a fuel inlet blade portion disposed at an inner area of the blade grooves and a fuel outlet blade portion disposed at an outer area of the blade grooves, a boundary portion disposed between the fuel inlet blade portion and the fuel outlet blade portion, in which a front surface angle and a rear surface angle of each of the fuel inlet blade portion and the fuel outlet blade portion are respectively varying relative to the length of each of the blades.
2. The fuel pump of claim 1 , wherein the impeller includes a ridge projecting horizontally outwards along the inner area of the blade grooves.
3. The fuel pump of claim 1 , wherein the front surface angle of the fuel outlet blade portion is less than the rear surface angle of the fuel inlet blade portion.
4. The fuel pump of claim 3 , wherein the front surface angle of the fuel outlet blade portion gradually decreases towards the outer area of each of the blades.
5. The fuel pump of claim 4 , wherein the front surface angle of the fuel outlet blade portion increases at a tip portion of each of the blades after gradually decreasing as approaching towards the outer area of each of the blades.
6. The fuel pump of claim 1 , wherein a thickness at a central V-shaped portion of the fuel outlet blade portion is thicker than a thickness at a central V-shaped portion of the fuel inlet blade portion.
7. The fuel pump of claim 1 , wherein the front surface angle of the fuel outlet blade portion is less than the front surface angle of the fuel inlet blade portion.
8. The fuel pump of claim 1 , wherein the front surface angle of the fuel outlet blade portion gradually decreases towards the outer area of each of the blades from about 40° to about 20°.
9. The fuel pump of claim 1 , wherein the rear surface angle of the fuel inlet blade portion gradually increases towards the outer area of each of the blades from about 20° to about 45°.
10. An impeller for a fuel pump of a vehicle, the fuel pump having a pump casing and a casing cover coupled with each other face to face and having a central cavity defined therein, the pump casing and casing cover each further including a circular groove formed along a respective inner surface opposing to each other, the respective circular groove in fluid communication with the central cavity of the pump casing and casing cover, the impeller comprising:
an impeller body formed in a substantially circular shape, the impeller body being rotatably disposed in the central cavity of the pump casing and casing cover;
a plurality blades of generally V-shape cross-section disposed along an outer surface of the impeller body with a plurality of blade grooves defined between the blades, the blade grooves in fluid communication with the respective circular groove of the pump casing and casing cover;
a ridge projecting horizontally outwards from an outer surface of the impeller body at an inner area of each of the blade grooves;
each of the blades including a fuel inlet blade portion disposed at an inner area of the blade and a fuel outlet blade portion disposed at an outer area of the blade, a boundary portion disposed between the fuel inlet blade portion and the fuel outlet blade portion, a front surface angle and a rear surface angle of each of the fuel inlet blade portion and the fuel outlet blade portion respectively varying relative to the length of each of the blades.
11. The impeller of claim 10 , wherein each of the blades is configured to have the front surface angle and rear surface angle of the fuel inlet blade portion and the rear surface angle of the fuel outlet blade portion, respectively, gradually increasing, and the front surface angle of the fuel outlet blade portion first gradually decreasing and then gradually increasing, as they respectively approaches from a root area of the blade towards a tip area of the blade.