Fuel injector with a cone shaped bent spray

Details Fuel injector with a cone shaped bent spray Fuel injector with a cone shaped bent spray

2000-02-08

2001-10-30

Morris, Lesley D. (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Fluid pressure responsive discharge modifier* or flow...

Fuel injector or burner

C239S533200, C239S596000, C239S391000

Reexamination Certificate

active

06308901

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to fuel injectors, specifically, fuel injectors which spray fuel in a cone-shaped spray at a bent angle to a longitudinal axis of the fuel injector.
BACKGROUND OF INVENTION
Prior art fuel injectors include a discharge end which sprays fuel at an angle oblique to a longitudinal axis of the injector. One design includes a discharge channel which extends along the longitudinal axis, but has a discharge end face which is oblique to the longitudinal axis. This design produces a spray pattern which sprays fuel at an angle oblique to the longitudinal axis of the injector, but is elliptical in shape.
It is believed that another design of fuel injectors includes a discharge channel which is at an angle oblique to the longitudinal axis and has a discharge face which is generally perpendicular to the discharge channel. The discharge face includes a circular exit orifice for discharging the fuel. However, the fuel can be discharged only at the angle of the discharge channel relative to the longitudinal axis. If a user requires a different spray angle, a different injector having the discharge channel at the different spray angle must be used, requiring a significant amount of tooling.
It would be desirable to have a fuel injector which discharges fuel at an angle oblique to the longitudinal axis of the injector, but discharges a circular spray of fuel from the injector, and can be manufactured to discharge the circular spray at one of a variety of desired angles.
SUMMARY OF THE INVENTION
Briefly, the present invention discloses an injector having a downstream end and a longitudinal axis extending therethrough. The injector comprising an outlet orifice located at the downstream end. The outlet orifice has an outlet axis oblique to the longitudinal axis. The outlet orifice discharges a cone-shaped spray having a spray axis co-linear with the outlet axis.
The present invention is also a valve seat for a fuel injector. The fuel injector comprises a longitudinal injector axis extending therethrough. The fuel injector also includes an upstream end having a fuel entrance orifice on the longitudinal injector axis and a downstream end having a fuel exit orifice. The fuel injector also includes a channel extending between the fuel entrance orifice and the fuel exit orifice. The fuel exit orifice has a channel axis oblique to the longitudinal injector axis. Fuel exiting the fuel exit orifice forms a symmetrical cone-shaped spray having a spray axis co-linear with the channel axis.
Further, the invention is a valve seat assembly for a fuel injector. The valve seat assembly comprises a valve seat and a bent stream insert. The valve seat includes a longitudinal axis extending therethrough, an upstream end having a seat entrance orifice on the longitudinal axis, and a downstream end having a seat exit orifice on the longitudinal axis. The valve seat also includes a seat channel extending between the seat entrance orifice and the seat exit orifice along the longitudinal axis and a recessed opening downstream of the seat exit orifice along the longitudinal axis. The recessed opening is larger than the seat exit orifice. The bent stream insert includes an upstream insert end having an insert entrance orifice, a downstream insert end, and a channel axis extending therethrough. The bent stream insert also includes an insert channel having an insert exit orifice at the downstream insert end, the outlet orifice having a channel axis oblique to the longitudinal injector axis and an insert projection extending from the upstream end. The insert projection is adapted to be retained in the recessed opening. The seat exit orifice is in fluid communication with the insert entrance orifice. The channel axis is at a first angle oblique to the seat axis.
The present invention is also a method of generating a cone-shaped bent spray from a fuel injector. The method comprises the steps of directing fuel into an entrance orifice in a valve seat, the entrance orifice being along a longitudinal axis of the fuel injector; directing the fuel from the entrance orifice, through a channel in the valve seat, and to an exit orifice, the channel being along a channel axis at an angle oblique to the longitudinal axis; and discharging the fuel from the exit orifice, the fuel forming a coneshaped spray having a spray axis co-linear with the channel axis.
Additionally, the present invention is a method of changing a fuel spray angle in a fuel injector comprising the step of substituting the first bent stream insert from a discharge end of a fuel injector, the first bent stream insert having a first spray angle, for a second bent stream insert into the discharge end of the fuel injector, the second bent stream insert having a second spray angle.
Further, the present invention is a method of providing multiple bent sprays from a single injector assembly comprising the steps of providing an injector having a discharge end, the discharge end being adapted to receive one of a plurality of inserts, each insert having a different pre-determined angle of discharge; selecting an insert with a pre-determined angle of discharge; and fixedly inserting the insert into the discharge end of the injector.


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patent: 7-119584-A (1995-05-01), None
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