Apparatus for injecting a fuel-gas mixture into an internal comb

Details Apparatus for injecting a fuel-gas mixture into an internal comb Apparatus for injecting a fuel-gas mixture into an internal comb

1991-10-22

1993-03-30

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

Combining of separately supplied fluids

And valving means controlling flow for combining

2394173, 2395854, F02M 6904

Patent

active

051976749

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention is based on an apparatus for injecting a fuel-gas mixture into an internal combustion engine as defined hereinafter. German Patent Disclosure Document DE-OS 36 09 798 already discloses an apparatus for injecting a fuel-gas mixture in which a recessed longitudinal bore of a valve holder fits around a fuel injection valve. Upstream of one injection end of the fuel injection valve, a mixing chamber is embodied in the valve holder, communicating upstream, via an annular gas gap formed between the injection end and the longitudinal bore, with an annular gas conduit that communicates with a gas source. However, this apparatus has the disadvantage that the size of the annular gas gap and the quality of centering of the fuel injection valve in the longitudinal bore of the valve holder are dependent on the tolerances in terms of length and shape of the fuel injection valve and of the longitudinal bore of the valve holder.
Because the guidance of the fuel injection valve in the longitudinal bore is at a pronounced distance from the injection end, the danger exists of canting and/or offset of the center axis of the fuel injection valve in the longitudinal bore of the valve holder and thus of an asymmetric embodiment of the annular gas gap and asymmetric injection of the fuel into the mixing chamber. Neither central injection of the fuel and thus the formation of a predominantly homogeneous fuel-gas mixture nor a requisite exact embodiment of the defined annular gas gap for the sake of precisely metered gas delivery is assured with any likelihood.


ADVANTAGES OF THE INVENTION

The apparatus according to the invention has an advantage over the prior art that the size of the annular gas gap and the quality of centering of the fuel injection valve in the longitudinal bore of the valve holder are independent of the length and shape tolerances of the fuel injection valve and of the valve holder. The position of the injection end of the fuel injection valve relative to the mixing chamber is defined in a simple manner directly at the injection end itself. The guidance of the fuel injection valve near its injection port enables not only the exact, symmetrical embodiment of the defined annular gas gap and thus the delivery of an accurately metered quantity of gas to the mixing chamber, but also a centered injection of the fuel into the mixing chamber and thus the formation of a predominantly homogeneous fuel-gas mixture.
The advantage in terms of installation of the apparatus according to the invention is that the fuel injection valves need not be selected with a view to their length and shape tolerances and matches to valve holders having certain longitudinal bores but can instead be installed arbitrarily. This considerably reduces production costs.
By means of the provisions recited herein, advantageous further developments of and improvements to the apparatus disclosed are possible.
It is especially advantageous if the bearing face of the longitudinal bore and the injection end of the fuel injection valve are embodied as tapering frustoconically radially with respect to the longitudinal axis of the valve, resulting in especially simple centering of the injection end of the fuel injection valve in the longitudinal bore of the valve holder.
It is advantageous if the annular gas gap is formed between the frustoconical injection end and an oblique segment of the longitudinal bore that tapers conically. Embodying the annular gas gap narrowly enables acceleration of the gas and thus improved mixing of the injected fuel with the delivered gas.
In order to embody a defined annular gas gap for delivery of an exact gas quantity at a predetermined acceleration, it is advantageous if the frustoconical injection end and the oblique segment extend parallel to one another.
It is also advantageous if the frustoconical injection end and the oblique segment converge in the direction of the mixing chamber, which produces particularly strong acceleration of the gas.
It is especially advantageous if t

REFERENCES:
patent: 1792929 (1931-02-01), Remey
patent: 2623786 (1952-12-01), Wille
patent: 3656693 (1972-04-01), Eckert
patent: 3680794 (1972-08-01), Romann et al.
patent: 3782639 (1974-01-01), Boltz et al.

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