Fluid sprinkling – spraying – and diffusing – Combining of separately supplied fluids – And valving means controlling flow for combining
Patent
1997-09-15
1999-05-18
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Combining of separately supplied fluids
And valving means controlling flow for combining
239432, 239433, B05G7/12
Patent
active
059042990
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND INFORMATION
U.S. Pat. No. 4,982,716 describes a fuel injector for injecting an air-fuel mixture which, at the downstream end of a nozzle body, has an adapter into which air can be introduced. The air is supplied via two supply ducts or supply orifices, which run obliquely to the longitudinal valve axis and open through into an inner spray-discharge region of the adapter to allow the air to collide with the fuel either upstream or downstream from a centrally arranged collision surface. The collision surface partitions the fuel into two spray-discharge orifices. Over their length, the air-supply ducts have a constant diameter and a circular cross-section. To assure a precise metering-in of the air, the metering cross-section must be fabricated to very exact dimensions. Since the entire adapter has to be manipulated when the supply ducts are inserted, this machining step is relatively costly. Moreover, once the supply ducts have been inserted, one can no longer vary their size.
The above applies to fuel injectors as well, as disclosed, for example, in German Patent No. 41 03 918 and U.S. Pat. No. 5,035,358. Here, as well, air supply ducts, which always exhibit a constant diameter and circular cross-section, are provided in an adapter housing body on the valve. The supply ducts are, again, inserted directly in the housing body, so that the entire housing body has to be handled in order to machine them.
Therefore, in known injectors where air is supplied in an ancillary housing body, the two functions of supplying or metering air and of mounting on the injector must be jointly approached, so that it is hardly possible to optimally realize both functions because of the integration.
Therefore, in known fuel injectors, air is supplied in a housing body through air-supply ducts which are directed toward the fuel in a central orifice. These housing bodies are formed in one piece, making it impossible to variably meter in air and aggravating the insertion of the air-supply ducts.
SUMMARY OF THE INVENTION
An advantage of the fuel injector according to the present invention is that it offers a greater design freedom and is able to be produced less expensively because it provides for a separation of the functions in the housing body of the fuel injector, which preprocesses the fuel using its available and metered-in air. Moreover, the function of supplying and metering air with respect to sealing off the fuel injector from an intake line is advantageously separated from the function of attaching the housing body to the fuel injector, so that each function, by itself, is better assured.
It is especially advantageous to design the housing body as a multi-part housing to facilitate installation of at least one calibrating sleeve for dosing air in a base member. While the base member is actually used to seal off the fuel injector from an intake line and to attach the housing body, the calibrating sleeves are chiefly responsible for supplying and metering air.
It can be beneficial to provide a spray divider in the base member to sustain or enhance the fuel injector's dual-jet characteristic.
It is quite possible to have many variants, because different calibrating sleeves can be installed in base members of the same design for various, specific applications. This is achieved in the sense of a unit construction system.
The materials of the base member and of the calibrating sleeves can differ from one another advantageously. In selecting the material for the base member, single criteria, such as temperature sensitivity, have only a very subordinate role.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a partial view of the fuel injector with a housing body of the present invention.
FIG. 2 shows a second example of a housing body.
FIG. 3 shows a third example of a housing body.
FIG. 4 shows the detail of a housing body with a stepped calibrating sleeve.
FIG. 5 shows the detail of a housing body with a partially conical calibrating sleeve.
FIG. 6 shows a calibrating sleeve with bulb-type enlargements on its per
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Asslaender Peter
Betzel Thomas
Bottler Rainer
Brueckner Reinhold
Grytz Uwe
Douglas Lisa
Kashnikow Andres
Robert & Bosch GmbH
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