Heat exchange – Heat transmitter
Reexamination Certificate
1996-04-05
2001-05-22
Atkinson, Christopher (Department: 3743)
Heat exchange
Heat transmitter
C029S890030, C257S722000
Reexamination Certificate
active
06234246
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a heat exchanger for cooling semi-conductor components or the like equipment having cooling fins that are spaced apart attached to and projecting out from a base section of extruded aluminum or another light metal, each fin being secured in a groove or the like recess in the base section.
The German patent document DE-PS 35 18 310 describes an extruded solid section with projections on the sides representing cooling fins that engage by virtue of fit in grooves in the base plate. Furthermore, this document mentions so called fin ratios (ratio of height to spacing) of more than 12:1 that consequentially determine the limits of surface area that can be achieved. Both technical and economic considerations require a minimum fin thickness that depends on the height of the fins. Because of the large amount of effort required, it is expensive to produce a heat exchanger with a large number of fins that are at the same time of a thin dimension.
An improvement over the version disclosed in DE-PS 35 18 310 is represented by a similar type of heat exchanger according to EP A 0 483 058 featuring cooling fins running between two flanking walls that, together with the base plate, form a kind of rectangular channel. Both the inner face of the flanking walls and the outer faces of the cooling fins feature ribbing that runs parallel to the base plate. Both walls of each cooling fin are connected at one end by a coupling head that can be inserted into the groove of the base plate and at the other end by a transverse strut; a further transverse strut at about mid height divides the space between the fins into two channels. The objective in that case was to reduce both the thickness of the cooling fin wall and the expenditure for manufacturing the heat exchanger.
In contrast to heat exchangers for forced air cooling or forced convection, heat exchangers for free convection may have thin, relatively tall fins. Such fins cannot be made as extruded sections. Normal sheet cannot be used as the small width of the grooves required in the base section cannot be realized by means of extrusion.
SUMMARY OF THE INVENTION
In view of this state of the art, the object of the invention is to improve the production of free convection in the that type of heat exchanger.
That objective is achieved by way of the present invention.
The cooling fins are, according to the invention, in the form of thin cooling-fin plates made of a thin strip of material; at least in the region where the cooling-fin plates are joined to the base section, the longitudinal section of the plates is partly extended by a profile which enables them to be mounted in grooves of a dimension that can be extruded.
In one design of the heat exchanger the cooling fin plate is made out of a wavy type of sheet, and the transverse distance, across the longitudinal axis, between two planes, determined by the wave peaks, corresponds to the width of that groove.
A further version features a cooling plate which, viewed in longitudinal cross-section, is profiled to provide shoulder-like, saw-tooth type ledges.
There are therefore two possible solutions. First, using a wavy type of sheet and secondly using a saw-tooth shaped sheet; whereby the sheet inserted in the base section may be much longer than the base section.
According to another feature of the invention, as viewed in longitudinal cross-section, a sloping surface runs between two neighboring shoulder like ledges and ends at the peak of one of the ledges. The other side of the sloping surface may extend to form a flat region parallel to the axis of the fin.
Also within the scope of the invention is that, between each pair of grooves, the base section provides a transverse recess that may taper inwards.
Further, it has been found favorable for the transverse recess to lie deeper in the base section than the groove.
REFERENCES:
patent: 2404166 (1946-07-01), Danilla
patent: 5014776 (1991-05-01), Hess
patent: 5435384 (1995-07-01), Wu
patent: 5499450 (1996-03-01), Jacoby
patent: 5542176 (1996-08-01), Serizawa et al.
patent: 0085049 (1980-06-01), None
patent: 0196552 (1982-12-01), None
Bock Uwe
Gluck Joachim
Alusuisse Technology & Management Ltd.
Atkinson Christopher
Bachman & LaPointe P.C.
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