| 摘要 |
PROBLEM TO BE SOLVED: To increase the efficiency of a Wesco fuel pump in all regions of rotation and to secure a delivery flow in the low rotation region f an electric motor. SOLUTION: The Wesco fuel pump comprises an impeller 7 rotationally driven by the electric motor M and a plurality of V-shaped impeller members 7b provided on the outer periphery of the impeller 7 in the circumferential direction. A V-opening angle Y of the impeller member at its back side 7Br in a rotating direction R is formed smaller than a V-opening angle X of the impeller member 7B at its front side 7Br in the rotating direction R. A groove width W of a space portion 7E formed between the impellers 7B, 7B is gradually larger as ranging from a V-shaped base portion 7Ba to an opening end 7Bg.
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