Heat exchange – Side-by-side tubular structures or tube sections – With manifold type header or header plate
Patent
1999-02-09
2000-07-04
Leo, Leonard
Heat exchange
Side-by-side tubular structures or tube sections
With manifold type header or header plate
165158, 165176, 165906, F28F 904
Patent
active
060824484
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a collector or header of a heat exchanger according to the preamble of claim 1.
The term header generally not only means an intermediate header or a header on the outlet side, but also a distributor on the inlet side.
Many of such multipart headers are known. In the past, for such a header one has generally made a cap, a tube bottom or a compartment subdivision of sheet metal or a plate-like material, caps having been deep-drawn for example of sheet metal. For special purpose constructions, injection moulded parts have already been used in the past. For example an evaporator, which is in particular also to be employed in motor vehicle air conditioning equipment, for a distributor a sandwich construction of injection moulded plates has been employed according to the DE-31 50 187 C2, in which the chambers required in a distributor have been obtained by corresponding groove formations.
In the following, instead of the term injection moulding the term diecast will be used in the description of the invention, the terms diecast and injection moulding being, however, considered to be synonyms within the scope of the invention.
It is already known per se to make the cap and the tube bottom of a header or a comparable structural part, such as a refrigerant distributor (DE-A1-42 12 721), each by diecasting. The diecast materials on aluminum basis used in most cases, however, cannot be soldered nor brazed due to their high portion of silicon in aluminum alloys. Therefore, in such cases one has assembled the header or a similar structural component by using inserted seals. This requires an additional constructional effort and restricts the permanent closeness.
The inset of the refrigerant distributor of the DE-A1-42 12 721 is not made as a diecast part but as an extruded piece (column 4, lines 1-3). Extruded pieces on an aluminum basis have always been able to be brazed due to the composition of their aluminum alloys different from that of diecast parts.
BRIEF SUMMARY OF THE INVENTION
The object underlying the invention is to further take advantage of the possibilities of the diecast manufacture for headers in motor vehicle heat exchangers than has been taken into account in the past.
That is, by means of an appropriate selection of the material for the inset the invention makes possible in an advantageous manner a combination of the following two aspects which has not been taken into consideration in the past:
On one hand, the inset is included in the soldering, preferably brazing, of the complete header.
On the other hand, the possibilities of making the form or design of the header by producing the header of diecast are taken advantage of.
Especially preferred is the use of the alloy according to claim 20 newly developed for the manufacture as a solderable or brazable diecast part.
That is, within the scope of the invention the following three aspects are in addition particularly taken advantage of:
First aspect: The diecast manufacture is not restricted only to a plate construction, but can also be employed for the manufacture of tank-like bodies with a bottom and a side wall extending therearound. Such a side wall extending around is not given from the beginning in the known plate construction.
Second aspect: The diecast technique makes it also possible to manufacture filigree flat web grids which have been manufactured in the past in a complicated assembly construction of cut out sheet metal strips (cf. DE 195 15 526 C1, FIG. 11).
Third aspect: In evaporators, in which the header serves as a distributor on the inlet side, it is even possible to design separate supply lines to different inlet chambers provided for a uniform distribution to continued ducts together with the connection openings between the supply lines and the respectively assigned inlet chamber in the diecast technique within the corresponding chamber subdivision, whereby in an integral fabrication of the chamber subdivision with the cap of the evaporator, a separate cover in the cap of an a
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patent: 5168925 (1992-12-01), Suzumura et al.
patent: 5203407 (1993-04-01), Nagasaka
patent: 5479985 (1996-01-01), Yamamoto et al.
Leo Leonard
Valeo Klimatechnik GmbH & Co, KG
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