Ventilation – Having inlet airway – Including structure for mixing plural air streams together
Reexamination Certificate
1999-02-17
2001-04-03
Wilson, Pamela (Department: 3749)
Ventilation
Having inlet airway
Including structure for mixing plural air streams together
C454S263000, C454S269000, C034S122000
Reexamination Certificate
active
06210268
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to an air mixer, located in the flow direction of a heated air stream for example in a flow channel upstream of a heat treatment chamber, for example for drying textile goods or tissue webs, and provided for the static mixing of two air streams of different temperature or quality flowing into one another, for which purpose the air mixer is provided with air mixing parts. Such previously known mixing parts are generally only deflectors that deflect the second air stream.
A dynamic air mixer is know for example from U.S. Pat. No. 4,495,858. In that patent, a fan is provided in a tube that is open to the exterior or to which in any case air is supplied from outside, by which fan a second air stream accelerated by the fan is introduced into the first air stream. The housing of the fan in the flow channel of the first air stream and also the mounts of the fan impede the flow of the first air stream and a low-loss mixing of the two air streams is not possible. For this reason, an additional fan is provided as well.
SUMMARY OF THE INVENTION
The goal of the invention is to permit two airflows to be fed into one another without additional expenditure of energy in such fashion that they automatically mix uniformly on contact.
Taking its departure from the device of the species recited at the outset, to achieve this stated goal, the invention provides that a hollow body is provided in the flow cross section of the first air stream to receive and guide the second air flow. A plurality of hollow bodies is distributed uniformly over the cross section of the flow channel of the first air stream so that simply because of this fact alone a distributed air supply of the second air stream into the cross section of the first air stream takes place. If, in another embodiment of the air mixer, the hollow body narrows toward its outlet end internally and possibly also externally to form a nozzle-shaped air outlet area, the second air stream flows into the first air stream at a higher speed because of this narrowing of the cross section alone, producing vortices that result in the desired mixing.
One special advantage of the device according to the invention is the extremely short mixing paths that result in only a small pressure loss. As a result of the radiating effect of the nozzle at the outlet from the hollow body, the pressure of the gas flowing through is even partially recovered. Advantageously, therefore, the air streams to be mixed have different pressure drops. This is the case for example in the mixing of a gas subject to a vacuum, for example after the air has been drawn out of a screen drum dryer and an added hot gas from another energy source, whose flow has a higher density, higher temperature, and possibly also a higher pressure.
Advantageously, therefore, flowrate differences between the two air streams are advantageous. These air streams can be further influenced without supplying energy, with the second air stream flowing at a higher pressure into the hollow bodies. This can easily be accomplished or intensified by including a diffuser, directly in front of the hollow body for example. As a result, the flowrate of the second air stream is reduced upstream from the hollow body but the hydraulic pressure is increased, so that when the air flows out of the nozzle the desired higher air flow is obtained. This can even be so high that the fan located downstream is driven.
REFERENCES:
patent: 1395938 (1921-11-01), Barducci
patent: 2131725 (1938-10-01), Chester
patent: 3911804 (1975-10-01), Tao
patent: 4657178 (1987-04-01), Meckler
patent: 4793247 (1988-12-01), Verweij
patent: 4858519 (1989-08-01), Meckler
patent: 5413530 (1995-05-01), Montaz
patent: 5463967 (1995-11-01), Gielow et al.
patent: 5779361 (1998-07-01), Sugira
patent: 5881756 (1999-03-01), Abbasi et al.
Antonelli Terry Stout & Kraus LLP
Fleissner GmbH & Co. Maschinenfabrik
Wilson Pamela
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