Fluid sprinkling – spraying – and diffusing – Combining of separately supplied fluids – And valving means controlling flow for combining
Patent
1996-11-21
1999-11-23
Weldon, Kevin
Fluid sprinkling, spraying, and diffusing
Combining of separately supplied fluids
And valving means controlling flow for combining
2394164, 2394245, 23953393, 137898, 137870, F23D 1460
Patent
active
059885327
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a valve nozzle for introducing a flowable medium into a mixing chamber, which nozzle is provided with a delivery conduit with which at least one nozzle opening in a nozzle head is associated and which nozzle has an axially movable closure body, which is disposed on the outflow side of the nozzle opening and is supported on an actuating means that is connected to a closing spring and a driving means.
2. Description of the Related Art
Valve nozzles of this kind, as are needed for instance for fuel injection valves, are known for instance in the conception shown in German Patent Disclosure DE-A 19 33 489 with a closure body located on the inside, and in which nozzles there is a closure body disposed between the delivery conduit and the nozzle opening in the interior of the nozzle head, so that between the valve seat for the closure body on the one hand and the nozzle opening on the other, a relatively large residual chamber remains, with the result that such injection valves dribble after injection.
From European Patent Disclosure EP-A 0 599 168, a device for combined blow-injection of fuel and air is known, in which a plurality of nozzle openings for the delivery of fuel, which are closable via a central closure body, discharge into a mixing chamber formed by an air conduit. The air conduit in turn is likewise closable via a central, second closure body, which cooperates with the first closure body for the nozzle openings. Not only is the production cost high, but the two closure bodies also have a relatively large mass which, given the mass forces to be controlled, demands considerable actuation forces both for the closing spring and for the driving means, such as an adjusting magnet, if short opening times and a high actuation frequency are to be attained.
With this last apparatus as its point of departure, the object of the invention is to create a valve nozzle of the type referred to at the outset which is designed more favorably with respect to manufacture and the mass forces to be controlled.
SUMMARY OF THE INVENTION
According to the invention, this object is attained in that the delivery conduit terminates, on its end toward the mixing chamber, in a calibrated inlet bore that discharges into a widening distribution chamber; that the distribution chamber discharges into the mixing chamber and has an encompassing valve seat for the closure body; and that the interstice between the valve seat and the circumferential contour of the closure body, in the opening position of the closure body, forms the nozzle opening. This arrangement has the advantage that the closure body can be made quite small, so that it has less mass. Since the compressive force exerted by the medium on the closure body is defined by the pilot pressure of the medium, and by the area of the closure body defined by the valve seat, which can be kept quite small, only a slightly greater closing force is needed for the closure and can be brought to bear by the closing spring. For the opening operation, the driving means need merely overcome the closing force of the spring, while the opening of the closure body is accomplished automatically via the pilot pressure of the medium to be introduced. The quantity of flowable medium to be introduced is determined here via the dimensions of the calibrated inlet bore and the opening time. Since the actual nozzle opening that discharges into the mixing chamber is formed by the interstice between the valve seat and the circumferential contour of the closure body in the opening position, dribbling after injection is avoided, since the incoming flow is cut off immediately upon the arrival of the closure body at the valve seat. By means of the surface of the closure body oriented toward the calibrated inlet bore and by means of the shaping of the distribution chamber, influence can now be exerted on the "spray pattern", and a widely fanned-out, fine distribution of the medium upon its introduction into the mixing chamber is
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Alt Norbert
Blaich Michael
Guerich Guenter
Schmuecker Karl-Joachim
FEV Motorentechnik GmbH & Co.
Spencer George H.
Weldon Kevin
Wells Ashley J.
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