Fuel supply device
AssigneeDenso Corporation
InventorsNorihiro Hayashi, Kiyomori Kobayashi
Life of this patent
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Abstract
A swirling wall structure-extends from a lower side toward an upper side in a sub-tank, and a fuel flow, which is outputted into an inside of the sub-tank from a flow outlet of a diffuser passage opened toward a lateral side, is swirled by the swirling wall structure. The swirling wall structure-includes a curved wall surface and a U-turn wall surface. The curved wall surface is curved about a longitudinal axis, which extends from the lower side toward the upper side in the sub-tank, to bend the fuel flow outputted from the flow outlet. The U-turn wall surface extends continuously from the curved wall surface to make a U-turn of the fuel flow, which is bent by the curved wall surface.
Claims10
A fuel supply device that supplies fuel from a fuel tank toward an internal combustion engine located at an outside of the fuel tank, the fuel supply device comprising:
- a sub-tank that is placed in an inside of the fuel tank and is shaped into a tubular body that has a bottom, wherein an opening of the sub-tank is opened toward an upper side;
- a jet pump that is received in an inside of the sub-tank, wherein the jet pump discharges pressurized fuel from a nozzle passage into a diffuser passage in the jet pump and thereby pumps stored fuel, which is stored in the fuel tank, into the inside of the sub-tank through the diffuser passage;
- a fuel pump that is received in the inside of the sub-tank, wherein the fuel pump draws the fuel pumped into the sub-tank by the jet pump and discharges the drawn fuel toward the internal combustion engine;
- and
- a swirling wall structure that extends from a lower side toward an upper side in the sub-tank and is spaced from a flow outlet of the diffuser passage opened toward a lateral side, wherein:
- a fuel flow, which is outputted into the inside of the sub-tank from the flow outlet of the diffuser passage, is swirled by the swirling wall structure, and the swirling wall structure, which is assumed to have a longitudinal axis extending from the lower side to the upper side of the sub-tank, includes:
- a curved wall surface that is curved about the longitudinal axis to bend the fuel flow outputted from the flow outlet;
- and
- a U-turn wall surface that extends continuously from the curved wall surface to make a U-turn of the fuel flow, which is bent by the curved wall surface;
- and
- an opening is located adjacent to the flow outlet of the diffuser passage at a location between the flow outlet of the diffuser passage and the swirling wall structure to enable an inflow of the fuel from an outside of the swirling wall structure into an inside of the swirling wall structure through the opening between the flow outlet of the diffuser passage and the swirling wall structure at a time when the fuel is outputted from the flow outlet of the diffuser passage.
Dependencies are inferred from the claim text.