Impeller type fuel pump
AssigneeDenso Corporation
InventorsAtsushige Kobayashi, Kiyotoshi Oi
Life of this patent
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Abstract
A fuel pump includes an impeller and a passage member having a pump passage around the impeller, a fuel suction port and a fuel discharge port. The pump passage includes an arc-shaped fuel passage connected to the suction port and a terminal fuel passage connected to the discharge port. The discharge port is located outside the pump passage in the radial direction, and the terminal fuel passage is formed so that a portion of the terminal fuel passage is located radially more outside as the portion of the terminal fuel passage moves in the rotation direction of the impeller. The sectional area of the terminal fuel passage except spaces occupied by the impeller is approximately constant to prevent flow energy loss.
Claims3
A fuel pump including an impeller having a plurality of blades and blade ditches on the periphery thereof and a passage member having a pump passage around said impeller, a fuel suction port and a fuel discharge port, wherein:
- said pump passage includes an arc-shaped fuel passage connected to said suction port and a terminal fuel passage connected to said discharge port;
- said discharge port is located outside said pump passage in the radial direction of said passage member;
- said terminal fuel passage extends so that a portion of thereof is located radially more outside as said portion moves in the rotation direction of said impeller;
- and
- the sectional area of said terminal fuel passage except spaces occupied by said impeller is approximately constant between said arc-shaped passage and said fuel discharge port.
Dependencies are inferred from the claim text.