EP0964218A2 - Heat exchanger with flat finned tubes, more particularly radiator,cooler,condenser or evaporator for automotive vehicle - Google Patents

Abstract

The vehicle heat exchanger assembly has ribbed flat tubes (2) with collectors (8a,8b) connected to the tube interiors, with one collector at each end of the tubes. The flat tubes (2) alternate, singly or in groups, with one end at a collector (8a), and the other end at the other collector (8b), using different heat exchange fluids. Each collector (8a,8b) has an inflow (30) and a backflow (32) for each of the fluids. The ends of the flat tubes (2), away from the collectors (8a,8b), have a U-shaped flow deflection (22).

Description

The invention relates to a heat exchanger, in particular heating heat exchangers, engine coolers, condensers or evaporator, for motor vehicles, with ribbed flat tubes, with the further features of the preamble of claim 1.

With such heat exchangers, it is common (cf. e.g. US 5174373), one collector in the area of both ends to arrange the ribbed flat tubes and thereby an inner Flat tube heat exchange fluid from one collector through the respective tube interior of the flat tubes to the other To direct collectors.

It is also already known (see e.g. DE 44 46 817 A1), only one collector provided with inlet and return use to which the respective ribbed flat tube with its The interior of the pipe is connected to multiple pipes, with the ends the flat tubes, which face away from the collector, with a deflection device for the floods are provided.

Finally, it is e.g. B. from the combination of one Water cooler of an engine cooling circuit and a condenser a motor vehicle air conditioner, an engine oil cooler or a charge air cooler known from various internal heat exchange fluids acted upon heat exchanger in the flow direction of the external heat exchange fluid, mostly in motor vehicles the ambient air, one after the other or next to each other (DE-G 91 11 412.8 U1). Such a multifunctional In addition to the construction effort, arrangement requires several Heat exchanger, which is particularly in material and manufacturing costs expresses a relative for their arrangement large space requirement, especially when arranged in motor vehicles is particularly critical.

The invention has for its object such multifunctional arrangement for motor vehicles regarding Material, manufacturing and in particular space requirements at least further optimize for certain applications.

This task is performed by the heat exchangers Features of claim 1 solved. Here are the functions of two heat exchangers that can be acted upon by two different internal heat exchange fluids in a single heat exchanger integrated. The desired optimization is then achieved particularly favorably if the two different Heat exchange functions can be used in chronological order be, then the ribbing of the flat tubes, which for the current heat exchange function is not needed, the Ribbing those active for the current heat exchange function Flat tubes for heat exchange with the external heat exchange fluid added. In this case, it may even be enough the entire ribbing of the heat exchanger only after one Heat exchange function to design a maximum external Heat exchange area needed. In the borderline case, you can even the outer ribbing compared to the known individual Halve heat exchangers. In any case, the Manufacturing only one type of heat exchanger for multiple functions manufactured and arranged during assembly in the motor vehicle to become, resulting in significant material savings, Manufacturing costs and assembly costs leads. Also the required installation space in the motor vehicle can in the above context be kept to a minimum.

The sub-claims 2 to 6 relate to preferred Developments of the invention.

Fig. 1 eine Draufsicht in Richtung der Strömung von Umgebungsluft als äußerem Wärmetauschfluid auf eine Ausbildungsform eines Wärmetauschers nach Anspruch 1 in teilweise geschnittener und teilweise Explosionsdarstellung;

Fig. 2 eine funktionelle Ansicht eines einzelnen Flachrohres mit weggelassener Verrippung;

Fig. 3 eine funktionelle Ansicht eines Wärmetauschers gemäß Fig. 1; sowie die

Fig. 4 und 5 Teilschnitte eines Wärmetauschers gemäß Fig. 1 in Längsrichtung der Flachrohre mit Darstellung unterschiedlicher Arten des Endabschlusses an den Enden der Flachrohre, die ihrem Sammler abgewandt sind.

The invention is explained in more detail below with the aid of schematic drawings using several exemplary embodiments. Show it:

Figure 1 is a plan view in the direction of the flow of ambient air as an external heat exchange fluid on an embodiment of a heat exchanger according to claim 1 in a partially sectioned and partially exploded view.

Figure 2 is a functional view of a single flat tube with the ribs omitted.

FIG. 3 shows a functional view of a heat exchanger according to FIG. 1; as well as the

4 and 5 partial sections of a heat exchanger according to FIG. 1 in the longitudinal direction of the flat tubes with representation of different types of end termination at the ends of the flat tubes which face away from their collector.

In all heat exchangers shown is a Block of flat tubes 2 arranged parallel to one another is provided, which is a common ribbing by zigzag slats 4 have at least on the flat sides of the flat tubes 2 connect. In addition, a corresponding one can also Ribbing 4a on the outer flat side of each outer flat tube 2 may be provided to which an outer side end plate 6 connects.

All of the exemplary embodiments also have in common that a group of flat tubes 2 communicates with a collector 8, which in two parts from a tube sheet 10 and a Lid 12 is assembled. The tube sheet has insertion slots 14 each for a free end with that Collector 10 communicating flat tubes 2. The Flat tubes are double-flow. The in the direction of flow of the inner heat exchange fluid first flood 16 runs in counterflow within the flat tube to the second flood 18, being between the two floods 16 and 18 a partition 20 is formed within the flat tube 2 is. The arrow 22 in FIGS. 1 and 2 illustrates the flow reversal of the two floods within the flat tube.

The lid 12 of the collector 8 is in turn through an intermediate wall 24 in an entrance-side section 26 and an outlet-side section 28 divided. The input side Department 26 has a side inlet 30 provided on the lid 12 and communicates within the collector 8 with the first flood 16. The exit section 28 also points to one side of the cover 12, here without Limitation of generality on the same side, one Return 32 of the internal heat exchange fluid and communicates within the collector 8 with the respective second Flood 18th

Without going into details of the type of construction in question Wanting to go into collector 8 further is additionally in Fig. 1 shown that in any case the partition 24 in the collector 8 can have tongues 34, which in along the tube plate 10th extending grooves or slots 36 can engage.

In the construction described, all parts are made preferably made of aluminum or an aluminum alloy, such as e.g. AlMn1, and are hard with each other sealing the respective partitions soldered.

1 is a collector 8a and 8b arranged in the area of both ends of the flat tubes 2, where both collectors of different types one internal heat exchange fluids are applied. The different Species can differ chemically in particular be. But you can also consider only one Internal heat exchange fluid parameters differ too choose how about the operating temperature.

In the embodiment according to FIG. 1 are included successive flat tubes 2 alternately communicating connected to the collector 8a or to the collector 8b.

However, this connection sequence can also be in another Rhythm. So you can instead of alternating 3 without restriction of generality one connection to only one flat tube with one Connection to a parallel connection of two flat tubes switch. Any other assignment of individual and / or group connections here is within the scope of the invention also possible.

Structure and connection of the two collectors 8a and 1 are identical, so that the collector 8b need not be described separately.

Describe again without restricting generality 3, 4 and 5 three particularly preferred embodiments the formation and arrangement of an inner Heat exchange fluid acted on flat tubes 2 in the deflection area of the floods.

The diversion of the floods can be complete or partially done in the flat tube 2 itself, as this two alternatives in FIG. 2 on the one hand and in FIGS. 4 and 5 on the other hand is shown. In the first place schematically The intended representation of Fig. 2 can also be figurative recognize such an embodiment, in which on End of the relevant flat tube 2, the partition 20 completely is omitted. Alternatively, this partition 20 can also openings 46 for flow connection analogous to FIG. 4 and Fig. 5 may be formed, here a number of two Openings is shown, but in their place also one single opening as a number of more than two openings 46 can kick.

If the redirection between the two floods exclusively analog to Fig. 2 or Fig. 4 or 5 within the Flat tube takes place, it is sufficient, the relevant flat tube at the end that does not communicate with its collector 8, easy to complete, e.g. by clamping and brazing. The embodiments according to FIG. 2, FIG. 4 and FIG. 5 instead show an end termination of the respective flat tube 2 by a separate cup-shaped element 48. Whose Arrangement gives the possibility of a redirection of the Flooding in the flat tube itself can even be avoided entirely instead the deflection in the cup-shaped in question Element 48 exclusively. But you can also take a hybrid form between the two embodiments which the deflection partially within the flat tube and partially made within the cup-shaped element is. Preferred and in the context of the representation is the Arrangement in which the deflection is only in the flat tube takes place and the relevant cup-shaped element 48 only for Front end of the relevant flat tube 2 is provided is.

In the embodiment according to FIG. 2, this is Cup-shaped element 48 at a free end of the relevant one Flat tube 2 put over. Fig. 4 shows the in this case Peculiarity that the cup-shaped element 48 between the free end of the relevant flat tube 2 and the tube sheet 10 of the spatially following collector 8 or 8a or 8b clamped is, so that also by this clamping hard soldering between the respective free end of the flat tube 2 and the tube sheet 10 can be done. 5 shows in contrast a variant in which on the separate training and Arrangement of the cup-shaped part 48 is dispensed with and its Function by appropriate cup-shaped training of Rohrboden 10 is taken over.

Finally, it is shown in Fig. 2 that in the frame the invention preferably such flat tubes 2 application find that are folded from a flat material so that at the folding also won the partition 20 of the flat tube becomes. This is particularly evident on the left in FIG. 2 apparent cut through the free end of the concerned Flat tube 2 where the partition 20 from an end zone of the original flat material is formed.

Claims (6)

Heat exchangers, in particular heating heat exchangers, engine coolers, condensers or evaporators, for motor vehicles, with ribbed flat tubes (2), the tube interior (38) of which is in each case acted upon by an internal heat exchange fluid which communicates with the tube interior (38) via collectors (8a, 8b), of which a first collector (8a) is arranged in the region of the first ends and a second collector (8b) in the region of the second ends of the flat tubes (2),
characterized, that the flat tubes (2) can be acted upon alternately at their first ends by the first header (8a) and at their second ends by the second header (8b) from their internal heat exchange fluid, in individual or group order, that the first collector (8a) with inlet (30) and return (32) of a first and the second collector (8b) with inlet (30) and return (32) of a different from the first heat exchange fluid is formed, and that the ends of the flat tubes (2), which face away from their collector (8a, 8b), are provided with a U-shaped flow reversal (22) in the flat tube (2). Heat exchanger according to claim 1, characterized characterized in that for the flow reversal (22) Reversing device (48) to the free end of the flat tube (2) is scheduled. Heat exchanger according to claim 1 or 2, characterized characterized in that for the flow reversal (22) at least an opening (46) in the partition (20) between opposing adjacent floods (16, 18) of the same flat tube (2) is provided and beyond the flow reversal (22) End of the flat tube (2) is closed. Heat exchanger according to claim 3, characterized by of the flat tubes (2) separate end closures (48) for the ends of the flat tubes. Heat exchanger according to claim 4, characterized by Caps (42) and / or plugs. Heat exchanger according to claim 4 or 5, characterized in that the end closures (42) in the tube sheet (10) a collector (8) are also trained to act on the other flat tubes (2) with internal heat exchange fluid is provided.

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