Heat exchange – Side-by-side tubular structures or tube sections – With manifold type header or header plate
Reexamination Certificate
2001-03-12
2001-12-11
Lazarus, Ira S. (Department: 3743)
Heat exchange
Side-by-side tubular structures or tube sections
With manifold type header or header plate
C165S140000, C165S153000
Reexamination Certificate
active
06328100
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a heat exchanger, preferably a heat exchanger in heating installations, an engine radiator, a liquefier or condenser or an evaporator, for motor vehicles with ribbed flat tubes with the further features of the preamble of claim
1
.
In such heat exchangers, it is common (cf. e.g. U.S. Pat. No. 5,174,373) to arrange a header each in the region of both ends of the ribbed flat tubes and in the process to conduct an internal heat exchange fluid of the flat tubes from the one header through the respective tube interior space of the flat tubes to the other header.
It is also already known (cf. e.g. DE 44 46 817 A1) to only use one header provided with a supply and a return to which the respective ribbed flat tube is connected in a multi-flow design with its interior space, the ends of the flat tubes facing away from the header being provided with a deflection device for the flows.
Finally, it is e.g. known from the combination of a water cooler of an engine radiator circulation and a liquefier or condenser of a motor vehicle conditioning system, an engine oil cooler or a charge cooling system, to arrange heat exchangers to which various internal heat exchange fluids are admitted in the flow direction of the external heat exchange fluid, in motor vehicles in most cases ambient air, one behind or next to the other (DE-G 91 11 412.8 U1). Such a multifunctional arrangement requires—apart from the constructional effort for several heat exchangers which in particular shows in the material and manufacturing costs—for their arrangement, too, a relatively great space, which is especially critical in particular in case of an arrangement in motor vehicles.
BRIEF SUMMARY OF THE INVENTION
The object underlying the invention is to further optimize such a multifunctional arrangement for motor vehicles with respect to the material, the manufacturing and in particular the space requirements at least for certain cases of application.
This object is achieved by the heat exchangers with the features of claim
1
. In this case, the functions of two heat exchangers to which two different internal heat exchange fluids can be admitted are integrated in one single heat exchanger. The desired optimization is achieved in an especially favourable manner if the two different heat exchange functions are utilized in a chronological order, in which case then the ribbing of the flat tubes which is not needed for the present heat exchange function supplements the ribbing of the flat tubes active for the present heat exchange function for the heat exchange with the external heat exchange fluid. In this case, it can even suffice to design the complete ribbing of the heat exchanger only in accordance with the one heat exchange function, which requires a maximal external heat exchange surface. That is, in a borderline case one can even halve the external ribbing with respect to the known individual heat exchangers. In each case, in the manufacturing process, for several functions only a single type of heat exchangers has to be made and arranged in the motor vehicle when assembling it, which results in a considerable saving of material, manufacturing and assembling costs. The required space for the assembly in the motor vehicle, too, can be kept to a minimum in the above mentioned context.
The subclaims
2
to
6
concern preferred further developments of the invention.
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Lazarus Ira S.
McKinnon Terrell
Morgan & Finnegan , LLP
Valeo Klimasechnick GmbH & Co KG
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