Heat exchange – With repair or assembly means
Patent
1999-01-05
2000-11-07
Leo, Leonard
Heat exchange
With repair or assembly means
165174, 165176, 165178, 165906, F28F 922
Patent
active
061422177
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a flat tube heat exchanger for motor vehicles with the features of the precharacterizing part of claim 1. Such a flat tube heat exchanger is known from the EP-A1-0 656 517.
In the known flat tube heat exchanger, at the end of the flat tube flaps are bent around collars opened up in the form of a tulip of insertion slits of a tube bottom for the flat tubes by means of special pressing tools. It is true that this results in a reliable mounting, but the corrresponding assembly is inconvenient and requires two steps. In the first step, the tube bottom is placed upon the tube-fin-package, the flaps at the tube ends being at the same time bent over the collars opened up in the form of a tulip by means of special pressing tools. In the second step, the cap has to be placed upon the tube bottom.
BRIEF SUMMARY OF THE INVENTION
The object underlying the invention is to enable a one-step assembly, correspondingly securing the flat tubes in the tube bottom against pulling. In the process, one has to observe that the security against pulling is primarily only necessary before soldering or brazing the complete heat exchanger, so that even smaller degrees of security against pulling can be accepted.
This assembly is rendered possible in a flat tube heat exchanger with the features of the precharacterizing part of claim 1 by the characterizing features thereof.
In the flat tube heat exchanger according to the invention, it suffices to press the header case already preassembled from tube bottom and cap onto the ends of the flat tubes in one step, whereby at these ends a material deformation with a yielding of wall material to the outside occurs, this wall material resulting in an undercutting security against pulling, i.e. against pulling the flat tubes out of the tube bottom.
It is generally known to carry out comparable material deformations by means of an expanding mandrel of a special tool (cf. e.g. DE-A1-24 48 332, DE-A1-41 12 431 and DE-A1-195 01 337). Such special tools with an expanding mandrel are dispensable according to the invention as the necessary undercutting expansion is inherently effected by the partition in the header case.
The subclaims 2 to 5 concern preferred further developments of this idea, in which the undercutting material displacement is even greater and can optionally be effected annularly. According to claim 2 or 3, in these developments additionally the structure of an expansion mandrel is embodied at the partition, which is advantageous but not absolutely necessary for the general teaching of the invention in the sense of claim 1.
According to claim 6, a preferred final assembly of a flat tube heat exchanger according to the invention, and in claim 7, a preferred embodiment as evaporator are referred to.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be illustrated more in detail with schematic drawings and several embodiments as follows, wherein:
FIG. 1 is a plan view on a header consisting of tube bottom and cap of a double-flow flat tube heat exchanger with a partly fragmentary cap;
FIG. 2 is a cross-section through the double-flow flat tube heat exchanger provided with the header according to FIG. 1, showing a longitudinal section through the chamber or duct subdivision of a flat tube with a view on the external connections of the header;
FIG. 3 is in an enlarged representation a partial section along the longitudinal wall in the cap of the header through its region of connection with the flat tubes in a first embodiment;
FIG. 4 is a representation as in FIG. 3 in a second embodiment, wherein the longitudinal wall in the cap intersects a chamber in the flat tube;
FIG. 5 is a partial view further enlarged with a section through the flat tube and a plan view on the longitudinal partition in the cap before assembling the assembled flat tube heat exchanger according to FIG. 4; and
FIG. 6 is a perspective partial view of the front side of a flat tube for the case in which a longitudinal partition formed according to FIG. 5 in t
REFERENCES:
patent: 1847743 (1932-03-01), Anderson
patent: 5105877 (1992-04-01), Ando
patent: 5183107 (1993-02-01), Le Gauyer
patent: 5479985 (1996-01-01), Yamamoto et al.
patent: 5535821 (1996-07-01), Potier
patent: 5605191 (1997-02-01), Eto et al.
patent: 5901784 (1999-05-01), Potier
Leo Leonard
Valeo Klimatechnik GmbH & Co. KG
LandOfFree
Motor vehicle flat tube heat exchanger with flat tubes retained does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Motor vehicle flat tube heat exchanger with flat tubes retained , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Motor vehicle flat tube heat exchanger with flat tubes retained will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1631929