Fuel pump
AssigneeAisan Kogyo Kabushiki Kaisha
InventorsMasaki Ikeya, Akio Muraishi
Life of this patent
Estimating the term…
Abstract
A fuel pump is provided with a casing and a substantially disk-shaped impeller that can rotate within the casing. A group of concavities is formed in each surface of the impeller. The concavities forming the group are arranged in concentric circles with respect to the rotation axis of the impeller. A first groove is formed in a first inner surface of the casing and extends from an upstream end to a downstream end in an area that faces one group of concavities. A second groove is formed in a second inner surface of the casing and extends from an upstream end to a downstream end in an area that faces the other group of concavities. A seal portion is formed in at least one of the first and second inner surfaces of the casing and formed by one layer or a plurality of layers of thin film.
Claims16
A fuel pump comprising:
- a casing;
- and
- a substantially disk-shaped impeller rotatably disposed within the casing, wherein
- a first group of concavities is formed in a lower surface of the impeller, and concavities forming the first group are arranged in concentric circles with respect to a rotational axis of the impeller;
- a second group of concavities is formed in an upper surface of the impeller, and concavities forming the second group are arranged in concentric circles with respect to a rotational axis of the impeller;
- a first groove is formed in a first inner surface of the casing, the first groove extending from an upstream end to a downstream end in an area that faces the first group of concavities;
- a second groove is formed in a second inner surface of the casing, the second groove extending from an upstream end to a downstream end in an area that faces the second group of concavities;
- an intake hole is formed in the casing, the intake hole passing from the exterior of the casing to the upstream end of the first groove;
- a discharge hole is formed in the casing, the discharge hole passing from the exterior of the casing to the downstream end of the second groove;
- at least one seal portion is disposed on at least one of the first inner surface, the second inner surface, the lower surface and the upper surface, the seal portion comprising a plurality of layers of thin film, the plurality of layers of thin film formed by an identical material;
- and
- a clearance is formed between the seal portion and a portion facing the seal portion.
Dependencies are inferred from the claim text.