Arrangement for the metered supply of a fuel, especially into th

Details Arrangement for the metered supply of a fuel, especially into th Arrangement for the metered supply of a fuel, especially into th

1988-01-22

1990-09-04

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

With heating or cooling means for the system or system fluid

In terminal element

239585, B05B 1500

Patent

active

049537890

DESCRIPTION:

BRIEF SUMMARY
The invention starts from the DE-OS 34 32 663 according to the preamble of the independent claim.
The known arrangement serves for the injection of a liquid fuel into the combustion space of a diesel engine, whereby a rotation of its own about the jet axis is imposed on the injection jet for the better mixture formation. This rotation of its own, respectively, the swirl of the injection jet, is effected by channels arranged inclined to the valve axis, by way of which the fuel is fed with an opened valve from a chamber formed in the valve body to the discharge opening. In a first embodiment, the channel is arranged helically-like at the outer circumference of a cylindrical collar adjacent the valve cone, whereby the channel is in connection with an annular chamber storing the fuel. The annular chamber is delimited, on the one hand, by the stem of the valve and, on the other, by the bore in the valve body receiving the valve-collar. In a second embodiment, the chamber storing the fuel is constructed as an annular chamber radially spaced from the valve in the valve body, from which the fuel is fed with an opened valve to the discharge opening by way of tangentially arranged channels. A relatively unimpeded heat flow to the fuel in the respective reservoir chamber of the arrangement is true for both embodiments.
The invention is concerned with the task to so construct the arrangement of the aforementioned type of construction for the use of a cryogenic, gaseous fuel, especially hydrogen, that the essential part of the cryogenic fuel stored during operation in the arrangement can absorb little heat.
This task is solved with the characteristic features of the independent patent claim. An interruption of the heat flow from the valve body to the fuel stored in the hollow stem of the valve is achieved by a stem arranged predominantly with clearance in the valve body so that the cryogenic fuel can be fed to the combustion space of the internal combustion engine with essentially unchanged density.
An advantageous further development of the invention by simple means is described in the claim 2. Cryogenic fuel can flow by the means described therein from the inflow chamber by way of the stem clearance with the valve body to the overflow channel adjacent the discharge opening whereby this flow taking place in the by-pass occurs above all with opened valve. This has the advantage that the cryogenic fuel has only a short duration of stay in the by-pass and thus, on the one hand, absorbs little heat and, on the other, additionally cools the hollow stem of the valve from the outside. Claim 3 describes a further construction of the arrangement in which the valve is intermittently controlled by way of the stem by a separate stroke-actuating mechanism. In order to keep small the heat flow favored by the large mass of the actuating mechanism to the fuel supply disposed behind the valve in the hollow stem, the stem according to a partial feature of the claim 6 is constructed hollow, approximately up to the coupling with the stroke-actuating mechanism. With radial fuel feed at about half the length of the stem to the reservoir chamber a cooling cushion is therewith realized in the hollow stem of the valve between the feed and the actuating mechanism. A hermetic seal toward the outside to the surroundings is achieved with the arrangement described in claim 4 for the stem extended beyond the valve body to the coupling with the stroke-actuating mechanism and therewith a slide seal is avoided which is difficult to control with cryogenic fuels. An actuating mechanism is finally described in the claim 5 which in an advantageous manner can be constructed small in diameter and protects the bellows provided for the hermetic seal against damages.
The invention is described by reference to an embodiment illustrated in the drawing in a half-longitudinal cross section.
An arrangement 1 for the metered feed of cryogenic, gaseous hydrogen into the combustion space of a non-illustrated internal combustion engine includes within a valve body 2 a

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"Liquid Hydrogen as a Fuel of the Future for Individual Transport," W. Strobl et al., BMW-AG and German Aerospace Research Establishment.

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