| 摘要 |
Fuel pump ( 10 ) may comprise a casing ( 18 ) and a substantially disc-shaped impeller ( 20 ) rotating within the casing. A plurality of groups of concavities ( 20 a , 20 b), arranged in concentric circles with respect to the rotational axis of the impeller, may be formed in at least one surface of the impeller. A plurality of grooves ( 24 a , 24 b , 24 c) may be formed in the inner surface of the casing that faces the surface in which the groups of concavities are formed. Each groove extends from an upstream end to a downstream end. Fuel is drawn in from the outside of the casing to the upstream ends of each of the grooves ( 24 a , 24 b , 24 c), and the fuel drawn into the casing is discharged to the outside of the casing from the downstream ends of each of the grooves ( 24 a , 24 b , 24 c). Each of the plurality of grooves ( 24 a , 24 b , 24 c) may face at least two or more of the plurality of groups of concavities ( 20 a , 20 b) formed in the impeller.
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