EP0964218B1 - Heat exchanger with flat finned tubes, more particularly radiator,cooler,condenser or evaporator for automotive vehicle - Google Patents

Description

The invention relates to a heat exchanger, in particular Heater core, radiator, condenser or 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 (see. e.g. US 5174373), each a collector in the region of both ends of the To arrange ribbed flat tubes and thereby an internal heat exchange fluid the flat tubes from the one collector through the respective tube interior of the flat tubes to the other collector too conduct.

It is also already known (see, for example, DE 44 46 817 AI), only one provided with inlet and return collector to which the respective ribbed flat tube with his Pipe interior is connected mehrflutig, with the ends of the Flat tubes, which are facing away from the collector, with a deflection are provided for the floods.

Finally, it is z. B. of the combination of Radiator of an engine cooling circuit and a condenser an automotive air conditioning system, a motor oil cooler or a Intercooler known from various internal heat exchange fluids acted upon heat exchanger in the flow direction the outer heat exchange fluid, in motor vehicles mostly the ambient air to arrange one behind the other or next to each other (DE-G 91 11 412.8 U1). Such a multifunctional arrangement requires in addition to the construction costs for several heat exchangers, especially in material and manufacturing costs expresses, even for their arrangement a relatively large Space requirements, especially when arranged in motor vehicles especially is critical.

Such a multifunctional arrangement in particular for aircraft having features of the preamble of claim 1 according to GB-A-583 814 is in terms of material, Fertigungsund in particular space expenditure at least for certain applications further optimized.

Here are the functions of two heat exchangers with the possibility of being exposed to two different internal heat exchange fluids integrated in a single heat exchanger. The the desired optimization is then achieved particularly favorably, when the two different heat exchange functions in temporal sequence be made usable, in which case the ribbing the flat tubes, for the current heat exchange function is not needed, the ribbing of the current heat exchange function active flat tubes for heat exchange with the supplemented external heat exchange fluid. In this case it can even sufficient, the entire ribbing of the heat exchanger only after to design a heat exchange function that has a maximum external Heat exchange surface needed. In the limit, you can even the outer ribbing over the known individual Halve heat exchangers in half.

The invention is based on the object, such Heat exchanger for the conditions in motor vehicles even further to optimize. This task is performed by a heat exchanger solved with the features of claim 1. In each Case only requires a single type of heat exchanger during production manufactured for multiple functions and during assembly in the Motor vehicle to be arranged, resulting in significant savings leads to material, manufacturing costs and assembly costs. The required installation space in the motor vehicle can in the above Context be kept minimal.

Claims 2 relates to a preferred development the invention.

Fig. 1 eine Draufsicht in Richtung der Strömung von Umgebungsluft als äußerem Wärmetauschfluid auf eine Ausbildungsform eines Wärmetauschers einer Bauart, auf welche sich die Erfindung bezieht, in teilweise geschnittener und teilweise Explosionsdarstellung;

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

Fig. 3 eine funktionelle Ansicht einer abgewandelten Ausführungsform eines Wärmetauschers gemäß Fig. 1; sowie

Fig. 4 einen Teilschnitt eines Wärmetauschers gemäß Fig. 1 in Längsrichtung der Flachrohre mit Darstellung einer erfindungsgemäßen Art des Endabschlusses an den Enden der Flachrohre, die ihrem Sammler abgewandt sind.

The invention will be explained in more detail below with reference to schemati-shear drawings of exemplary embodiments. Show it:

Fig. 1 is a plan view in the direction of the flow of ambient air as an external heat exchange fluid to an embodiment of a heat exchanger of a type to which the invention relates, in a partially sectioned and partially exploded view;

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

3 is a functional view of a modified embodiment of a heat exchanger according to FIG. 1; such as

Fig. 4 is a partial section of a heat exchanger of FIG. 1 in the longitudinal direction of the flat tubes showing a type of Endabschlusses invention at the ends of the flat tubes, which are facing away from their collector.

In all illustrated heat exchangers is a block provided from mutually parallel flat tubes 2, which have a common ribbing by zigzag blades 4, connect at least to the flat sides of the flat tubes 2. In addition, also a corresponding ribbing 4a on the outer flat side of a respective outer Flat tube 2 may be provided, to which an external lateral End plate 6 connects.

All embodiments is further common that a group of flat tubes 2 communicates with a collector 8, which two-part of a tube sheet 10 and a Cover 12 is composed. The tubesheet has insertion slots 14 each for a free end of the concerned with Collector 8 communicating flat tubes 2 on. The Flat tubes are doubly formed. The in the flow direction the inner heat exchange fluid first tide 16 extends while in countercurrent within the flat tube to the second flood 18, wherein between the two floods 16 and 18 a partition wall 20 is formed within the flat tube 2. 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 by an intermediate wall 24 in an input-side department 26 and an output-side department 28 divided. The input side Department 26 is with a lateral inlet 30th provided on the lid 12 and communicates within the collector 8 with the first flood 16. The output-side department 28 also has on one side of the lid 12, here without Restriction of generality on the same page, a return 32 of the internal heat exchange fluid and communicates within the collector 8 with the respective second flood 18th

Without looking at details of the type of the concerned Collector 8 to go further, is in addition in Fig. 1st illustrated that in any case the intermediate wall 24 in the collector. 8 Tongues 34 may have, which in along the tube sheet 10th extending grooves or slots 36 can engage.

In the construction described all parts exist preferably of aluminum or an aluminum alloy, such as e.g. AIMnl, and are harsh with each other under sealing Soldered partitions.

In the embodiment of Fig. 1 is ever a collector 8a and 8b arranged in the region of both ends of the flat tubes 2, being both collectors of different types of an inner Heat exchange fluids are acted upon. The different types may in particular be chemically different. But one can also consider only one parameter of the to choose different inner heat exchange fluid, such as the operating temperature.

In the embodiment of FIG. 1 are consecutive following flat tubes 2 alternately communicating the collector 8a or connected to the collector 8b.

However, this connection sequence can also be in another Rhythm. So you can say instead of the alternate Connection according to FIG. 3 without limiting the generality in each case a connection to only one flat tube with a connection each to a parallel circuit of two flat tubes change. Any other assignment of individual and / or groupwise Connections is also possible within the scope of the invention.

Construction and connection of the two collectors 8a and 8b as shown in FIG. 1 are similar, so that the collector 8b does not need to be described separately.

Again, without limitation of generality describe FIGS. 3 and 4 show two particularly preferred embodiments the training and arrangement of an internal Heat exchange fluid acted upon flat tubes 2 in the deflection the floods.

The deflection of the floods can be complete or partially done in the flat tube 2 itself, as with two alternatives in Fig. 2 on the one hand and in Fig. 4 on the other is shown. In the primarily schematically meant Representation of Fig. 2 can also be objectively such Detect embodiment in which at the end of the relevant Flat tube 2, the partition 20 is completely omitted. alternative can this partition 20 also with the flow connection serving openings 46 may be formed analogous to FIG. 4, wherein here a number of two openings is shown at the However, place a single opening as well as a number of more than two openings 46 can occur.

If the diversion between the two floods exclusively analogous to FIG. 2 or FIG. 4 within the flat tube If it is sufficient, the relevant flat tube at the end, which does not communicate with its collector 8, just finish, e.g. by clamping and brazing. The Embodiments according to FIG. 2 and FIG. 4 show instead an end of the respective flat tube 2 by a separate cup-shaped element 48. Its arrangement gives the possibility on a deflection of the floods in the flat tube itself even to refrain entirely and instead the diversion in the concerned cup-shaped element 48 exclusively. But you can also be a hybrid between the two embodiments take part, where the diversion partially within the Flat tube and partially within the cup-shaped element is made. Preferred and meant within the scope of the illustration is the arrangement in which the deflection is exclusive takes place in the flat tube and the respective cup-shaped element 48th only to the frontal conclusion of the respective flat tube. 2 is provided.

In the embodiment according to FIG. 2, in accordance with the representation in FIGS. 1 and 3, the cup-shaped element 48 is slipped over at a free end of the relevant flat tube 2. This type of termination of an open end of a flat tube is to be understood here only as an example of a possibility of the design of a heat exchanger to which the invention relates.
Fig. 4 shows, in contrast, the variant according to the invention, is dispensed with in the separate training and arrangement of the cup-shaped part 48 and its function is taken over by appropriate cup-shaped formation 48 of the tube sheet 10 with.

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

Claims (2)

1. Heat exchanger, in particular heating heat exchanger, engine radiator, condenser or evaporator, 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 headers (8a, 8b), of which a first header (8a) is arranged in the region of the first ends and a second header (8b) in the region of the second ends of the flat tubes (2),
   the flat tubes (2) being capable of being acted upon by their internal heat exchange fluid in an individual or grouped sequence alternately at their first ends from the first header (8a) and at their second ends from the second header (8b),
   the first header (8a) being designed with an inflow (30) and return flow (32) of a first heat exchange fluid and the second header (8b) being designed with an inflow (30) and a return flow (32) of a second heat exchange fluid different from the first, and
   those ends of the flat tubes (2) which face away from their header (8a, 8b) being provided with a U-shaped flow reversal (22) in the flat tube (2),
   characterized by end closures (48), separate from the flat tubes (2), for those ends of the flat tubes which are also formed in the tube sheet (10) of a header (8) which is provided for acting upon other flat tubes (2) with internal heat exchange fluid.
2. Heat exchanger according to Claim 1, characterized in that, for the flow reversal (22), at least one orifice (46) is provided in the partition (20) between oppositely directed adjacent flows (16, 18) of the same flat tube (2).

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