Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Reexamination Certificate
2000-03-06
2001-11-20
Lazarus, Ira S. (Department: 3743)
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
C165S133000, C165SDIG003
Reexamination Certificate
active
06318456
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a heat exchanger of the crosscurrent type.
2. Description of the Related Art
Such a heat exchanger is known from DE-A 195 28 117. This heat exchanger consists of flow duct plates with flow duct openings and also connecting duct plates. The flow duct plates and connecting duct plates are stacked one above the other alternately, in such a way that there is no fluid connection between flow duct plates adjacent to the flow duct openings. In this case, the flow duct openings of the flow duct plates are designed in the form of elongately shaped cutouts which, in interaction with the closed connecting duct plates, form fluid paths. The height of the fluid paths results, in this case, from the thickness of the flow duct plates. A lower connecting duct plate, a flow duct plate and an upper connecting duct plate are necessary in order to form a respective fluid path.
SUMMARY OF THE INVENTION
One disadvantage of such a known heat exchanger is the relatively large number of individual parts. In each case, a lower connecting duct plate, a flow duct plate and an upper connecting duct plate are necessary in order to form a respective fluid path. This results in a comparatively high weight and a high material requirement. This material requirement is increased by the fact that the cutouts for the flow ducts are removed from the flow duct plates by means of separating production methods, thus causing a comparatively large amount of high-grade materials to be lost. Since three plates are required in order to form a fluid path, there is also a large number of assembly seams which must be sealed off reliably in a fluid tight manner during the production of the heat exchanger, in order to ensure sufficient operating reliability.
One object on which the invention is based is to provide a heat exchanger of the type initially mentioned, in such a way that the above mentioned disadvantages are avoided, so that, while having at least the same operating reliability, it can be produced more efficiently and more cost-effectively and has a lower weight.
In accomplishing the objects of the invention, there has been provided a heat exchanger of the crosscurrent type, through which at least two fluids flow, comprising; a plurality of pairs of plates that are stacked one on the other between two cover plates, the plates of each pair being spaced from one another in a first region and being in contact in a second region, so that fluid paths are formed between them in a heat transfer region; each pair of plates including inlet ducts and outlet ducts arranged laterally in duct regions and formed from inlet duct openings and outlet duct openings in the plates, at least one inlet duct and one outlet duct in a first pair of plates being fluidically connected to a group of fluid paths formed between a third pair of plates separated from the first pair of plates by a second pair of plates; wherein the spacing of the plates in each pair is achieved by means of shaped-out portions of the plates.
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Brenner Martin
Damsohn Herbert
Luz Klaus
Pfender Conrad
Behr GmbH & Co.
Foley & Lardner
Lazarus Ira S.
McKinnon Terrell
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