Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Patent
1996-07-01
1998-10-13
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
2395854, 239900, 25112921, B05B 130, F16K 3102
Patent
active
058200312
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a valve needle for an electromagnetically actuated valve.
BACKGROUND INFORMATION
German Patent Application No. 40 08 675 already discloses a valve needle for an electromagnetically actuated valve which is comprised of an armature, a valve-closure member, and a sleeve-shaped connecting pipe joining the armature with the, e.g., spherical valve-closure member. The individual sections represent individual parts which are each manufactured separately and are first joined together by means of jointing methods, e.g. laser welding. The armature in this case completely embraces the connecting pipe radially and axially at least in part, since the connecting pipe is secured in a longitudinal orifice passing right through the armature. The connecting pipe, itself, also has a continuously traversing inner longitudinal orifice, in which the fuel can flow toward the valve-closure member and then flow out near the valve-closure member through radially running, crosswise orifices introduced in the inner wall of the connecting pipe. The fuel first flows inside the valve needle and does not leave the valve needle until close to the valve seat.
SUMMARY OF THE INVENTION
In contrast, the valve needle according to the present invention has the advantage of being able to be produced quite simply and cost-effectively. This is achieved in that the "connecting pipe" no longer has a sleeve shape, but rather is able to be manufactured from a simple and inexpensive semifinished profiled section such as a connecting piece between the armature and the valve-closure member. Thus, all manufacturing processes for longitudinal slits or crosswise orifices in the connecting part are eliminated. The cross-section of the suitable semifinished profiled sections is such that flow channels are automatically formed in the longitudinal orifice of the armature when the armature and connecting part are joined. The relatively large cross-sections of these flow channels are advantageous, as they permit the fuel to flow unhindered through the flow channels in the axial direction and, subsequently, along the outer contour of the connecting part up to the valve-closure member. What is especially advantageous is the use of inexpensive rod stock for the connecting part, which merely has to be dimensioned to an exact length for application on the valve needle.
Particularly advantageous further developments and improvement of the valve needle according to the present invention are semifinished profiled sections to be used as connecting parts for the valve needle which has a cross-shaped or Y-shaped cross section. Together with the four or three profiled arms, the connecting piece used in the longitudinal orifice of the armature also forms, accordingly, four or three flow channels, as one flow channel is created between each two profiled arms in the circumferential direction.
Moreover, it can be advantageous to use semifinished profiled sections having a circular segment-shaped crosssection for the connecting part, particularly when asymmetrical jet characteristics of the medium to be spray-discharged are desired.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a fuel injector with a valve needle according to the present invention.
FIG. 2 shows a side view of a valve needle in accordance with a first embodiment of the present invention.
FIG. 3 shows a top view of a valve needle in accordance with the first embodiment of the present invention.
FIG. 4 shows a side view of a valve needle in accordance with a second embodiment of the present invention.
FIG. 5 shows a top view of a valve needle in accordance with the second embodiment of the present invention.
FIG. 6 shows a top view of a valve needle in accordance with a third embodiment of the present invention.
FIG. 7 shows a top view of a valve needle in accordance with a fourth embodiment of the present invention.
FIG. 8 shows a top view of a valve needle in accordance with a fifth embodiment of the present invention.
FIG. 9 shows a top view of a v
REFERENCES:
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patent: 4007880 (1977-02-01), Hans et al.
patent: 4915350 (1990-04-01), Babitzka et al.
patent: 5072885 (1991-12-01), Hans et al.
patent: 5307991 (1994-05-01), Hanson et al.
patent: 5566920 (1996-10-01), Romann et al.
Dreyer Manfred
Maier Martin
Reiter Ferdinand
Evans Robins O.
Kashnikow Andres
Robert & Bosch GmbH
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