Fluid injection nozzle
AssigneeNippondenso Co., Ltd.
InventorsYasuhide Tani, Hideto Inagaki
Life of this patent
Estimating the term…
Abstract
A fluid injection nozzle according to the present invention comprises a first plate having a first hole through which fluid is allowed to flow in, a second plate disposed in layers on the downstream side of the first plate and having a second hole partially communicating with said first hole and tapered toward the downstream side, and a space which is formed between an outlet of the first hole and an outlet of the second hole and in which a liquid film is formed by the fluid which collides with an inner wall surface serving to form the second hole.
Claims37
A fluid injection nozzle serving to form an injection hole through which pressurized fluid is injected toward a low-pressure space, said nozzle comprising:
- a first plate having a first hole of a predetermined form;
- and
- a second plate having a second hole of a predetermined form,
- wherein said first and second plates are overlapped with each other and said two holes are so located as to be overlapped with each other to form a penetrating opening which penetrates through directly in a direction of fluid injection, so that fluid is injected through said two holes, said first plate and said second plate each having an upstream-side and a down-stream side such that the downstream-side of said first plate is adjacent the upstream-side of said second plate, an area of overlap of the first hole of said first plate and the second hole of said second plate being smaller than an upstream-side area of the second hole of said second plate such that said first hole defines a first throttle portion and said upstream-side area of the second hole defines an expanded fluid path portion, said second hole further defining a second throttle portion at the downstream-side of the second plate.
An injection hole constituting member which serves to form a fuel injection hole of a fuel injection valve that injects pressurized fuel as a spray which is combustible in an internal combustion engine, said injection hole constituting member comprising:
- a first member having a plate portion in which a first hole having a predetermined shape is formed;
- and
- a second member disposed on the downstream-side of said first member in close contact with the plate portion of said first member and having a plate portion in which a second hole is so formed as to be located on the downstream side of said first hole to form a penetrating opening which penetrates directly from said first hole in the direction of fluid injection,
- wherein an axial cross-sectional area of said second hole of said second member gradually decreases from an upstream-side thereof to a downstream-side thereof and an area of said penetrating opening is smaller than an upstream-side area of said second hole of said second member.
An injection hole constituting member which serves to form a fuel injection hole of a fuel injection valve that injects pressurized fuel as a spray which is combustible in an internal combustion engine, said injection hole constituting member comprising:
- a first member having a plate portion in which a first hole extending like a slit over a predetermined length is formed;
- and
- a second member disposed on the downstream-side of said first member in close contact with the plate portion of said first member and having a plate portion in which a second hole is formed, said second hole being in flow communication with only a portion of said first hole, said plate portion of said second member closing a remaining portion of said first hole, an axial cross-sectional area of said second hole of said second member gradually decreasing from an upstream-side thereof to a downstream-side thereof and an area of said flow communication being smaller than an upstream-side area of said second hole of said second member.
Dependencies are inferred from the claim text.