WO2011012684A2

WO2011012684A2 - Heat exchanger

Info

Publication number: WO2011012684A2
Application number: PCT/EP2010/061057
Authority: WO
Inventors: Mehmet Tosun; Boris Kerler; Karl Hammel; Ronald Keppler; Volker Velte; Mathias Wendorf; Jörg BERGMILLER
Original assignee: Behr Industry Gmbh & Co. Kg
Priority date: 2009-07-29
Filing date: 2010-07-29
Publication date: 2011-02-03
Also published as: DE102009035251A1; WO2011012684A3

Abstract

The invention relates to a heat exchanger, particularly for a motor vehicle, comprising a collector having a floor (3), wherein a plurality of passages (2) are formed in the floor (3), and a stack of flat tubes (1), wherein the ends of the flat tubes (1) each are inserted and fixed in the passages (2) in a fluid-tight matter, wherein the floor (3) is implemented at least in segments as a plurality of floor pieces (4) disposed adjacent to each other in a stack direction (T) of the flat tubes (1), wherein at least one of the passages (2) is formed in at least one of the floor pieces (4).

Description

heat exchangers

The invention relates to a heat exchanger, in particular for a motor vehicle, according to the preamble of claim 1 and a method for producing a heat exchanger according to the invention.

It is known to construct heat exchangers from a stack of flat tubes, wherein each of the flat tubes opens at the end into a passage of a bottom of a collector box. The passages are introduced as openings in a trained as Blechformteif soil.

It is the object of the invention to provide a heat exchanger whose exact design is easily changed.

This object is achieved according to the invention for a heat exchanger mentioned above with the characterizing Merkmaien of claim 1. The formation of the floor as a sequence of several floor pieces allows a modular construction of the floor, so that a vorratυng of universally usable components feed is made, in particular, the individual components can be produced by means of inexpensive and simple tools. In particular, the number of flat tubes or width of the heat exchanger in the stacking direction can be varied in a simple manner, depending on the requirements, so that a heat exchanger according to the invention offers cost advantages, in particular for small series and medium-sized series.

Generally, it is not necessary for the purposes of the invention that a passage is formed in each of the floor pieces. Some pieces of ground may be formed without draft. It is also possible that several passages are formed in the same bottom piece. In particular, the case is possible that exactly one passage is formed in each of the floor pieces. If several passages are formed in the same bottom piece, then depending on the requirements in the stacking direction, they can be arranged next to one another and / or one behind the other in a flow direction of the exchanger network (multi-row heat exchanger).

In a preferred Alisführungsform of the invention, the bottom pieces are materially interconnected, in a preferred detail design by means of soldering in a brazing furnace. Alternatively, a welding of the bottom pieces can be provided together. In general, the bottom pieces are advantageously made of aluminum or an aluminum alloy, in which case they may in particular be plated with solder on one or two sides. It may also be provided only a local solder coating in the region of a cohesive connection. The bottom pieces may also consist of a different material, for example stainless steel.

In a preferred embodiment of the invention, a box of the collector is secured by welding to the floor. In a floor according to the invention, which is »nodular built from Bodenstϋcken, is the Welding a collector a simple and effective way to complete a collector box. In an alternative embodiment of the invention, however, the collector can also be fixed cohesively together with the bottom and the flat tubes in the course of a soldering.

In a particularly preferred embodiment, positive-locking means are provided on at least some of the bottom pieces, whereby the bottom-pieces are aligned perpendicular to the stacking direction by the positive-locking means. As a result, the exact positioning of the individual floor pieces to each other is supported by formations on the bottom pieces themselves, so that the effort in the alignment of the floor pieces in the course of a mechanical pre-assembly (Kasseltierung) is reduced.

In a further embodiment of the invention, the bottom pieces have an overlap area for surface deletion with an adjacent bottom piece. In a preferred, but not necessary, detail configuration, the overlapping area extends substantially parallel to a plane of the floor. As a result, a particularly secure fixing of the floor pieces is made possible, wherein the amount of overlapping material can be kept low. In particular, the bottom in the stacking direction of the bottom pieces is particularly securely connected, so that a high resistance to thermally induced tensions, in particular in the stacking direction, is achieved during operation of the heat exchanger.

Generally advantageous, the floor pieces can have a raised edge which runs parallel to a longitudinal side of the floor. By juxtaposition of the ground pieces, an erected longitudinal edge of the base is formed overall, by means of which, for example, a fixing of a Facilitated collector box and a mechanical stabilization and stiffening of the soil is achieved. In a preferred detailed design, a stop surface for the positioned contact of an adjacent bottom piece can also be provided in the region of the edge of a bottom piece. By dimensionally accurate production of the stop surfaces as a dimensionally accurate and positional cassitation of the bottom pieces is particularly easy.

In a further embodiment of the invention, some of the ground pieces are formed as not provided with a passage intermediate pieces, whereby a further subdivision of the components of the soil is given in each inexpensive to manufacture modules. In a preferred detailed design, the intermediate pieces, for example, extruded moldings, which are particularly preferably provided with a groove for receiving an edge of an adjacent bottom piece. In this way, a particularly safe and simple coffering and soldering done by the extruded and grooved intermediate pieces are used in alternation with bottom pieces, which have passages and in particular can be formed as sheet metal parts. In general, a heat exchanger according to the invention can have a single-row or multi-row bottom. A multi-row bottom can be formed, for example, by providing two passes successively in the same bottom piece in the direction perpendicular to the stacking direction. Alternatively, however, two bottom pieces can also be provided one behind the other perpendicular to the stacking direction in order to form a multi-row bottom.

The object of the invention is achieved for a method for producing a heat exchanger according to the invention having the features of claim 12. First, the bottom of the bottom pieces and the so-called block of flat tubes and optionally between the flat tubes arranged ribs separately cassetted. After such Vorkassettie- rυng these two component groups, which may be supported by suitable retaining clips, the two component groups are joined together, the ends of the flat tubes are inserted into the passages of the pre-assembled floor. After the cassetting of soil and block so carried out, the joint soldering of these component groups takes place in a brazing furnace.

In a preferred detailed design may also be provided the step that a collector box is welded to the soldered unit of soil and block. In an alternative embodiment, instead of welding the collector box, which is expediently carried out after the soldering operation, a common soldering of the collector box with base and block may also be provided. For this purpose, the header box is also pre-assembled mechanically with base and block prior to joint soldering.

Further features and advantages of the invention will become apparent from the embodiments described below and from the dependent claims.

Hereinafter, several preferred embodiments of the invention will be described and explained in more detail with reference to the accompanying drawings.

1 shows a partial spatial view of a first embodiment of a heat exchanger according to the invention.

FIG. 2 shows a three-dimensional view of a bottom of the heat exchanger of FIG. 1. FIG.

Fig. 3 shows a schematic plan view of the bottom of another

Ausführungsbetspiels of the invention.

Fig. 4 shows a partial spatial view of another embodiment of a heat exchanger according to the invention. 5 shows a partial spatial view of a bottom of the heat exchanger from FIG. 4.

Fig. 6 shows a partial spatial view of another embodiment of a heat exchanger according to the invention.

FIG. 7 shows a spatial view of the bottom of the heat exchanger of FIG. 6. FIG.

A heat exchanger according to the invention comprises a plurality of flat tubes 1, which are stacked parallel to one another in a stacking direction or depth direction T. Ribs (not shown) are arranged between the flat tubes, for example corrugated ribs or sieve ribs. The ends of the flat tubes 1 each open into passages 2 of a bottom 3 of a collector of the heat exchanger. The header of the heat exchanger is completed by means of a header box 8 to a closed space through which a liquid and / or gaseous fluid, e.g. Coolant, refrigerant or air, flows and is distributed to the individual flat tubes 1. In the present example, the collector box 8 is fluidly connected cohesively to the bottom 3 by welding an edge region 5. The base 3 with the flat tubes 1 and the ribs arranged therebetween is soldered in a material-locking manner after mechanical pre-assembly ("cassetting") In the present case, all of the components consist of an aluminum alloy, the flat tubes 1 and the bottom 3 solder plating for soldering in have the oven.

The bottom 3 comprises a plurality of bottom pieces 4, which are arranged one behind the other in the stacking direction T and fixed cohesively to one another. In each of the bottom pieces 4, one of the passages 2 for receiving one end of a flat tube 1 is formed. The bottom pieces 4 are made of formed, solder-plated sheets. The passages 2 are formed by a step-by-step punching in the floor tiles. bridge 4 introduced. In addition, in the exemplary embodiment according to FIG. 2, the bottom pieces 4 each comprise an overlapping region 5 in the manner of a step, which extends transversely to the depth direction T on one of the two longitudinal edges of a piece of fabric 4. Due to the step 5, there is a surface overlap with the adjoining bottom piece 4, so that a flat and particularly secure soldering of the adjoining bottom pieces in the overlapping area 5 is ensured. The soldered Hache the overlap region 5 runs parallel to the plane in which extends the substantially flat bottom 3 due to the gradual formation of the overlap region. In the example according to FIG. 1 and FIG. 2, the bottom pieces 4 arranged next to each other do not have a raised edge, so that a lower edge 8a of the collector box 8 running parallel to the depth direction T rests directly on the level of the bottom 3. Fig. 3 shows a bottom of a further embodiment of the invention, in which the bottom pieces 4 have on one side an overlap region 5 in the form of a plurality of projecting tongues 6, wherein edge-side tongues 6 abut directly on a raised edge 7 of the following bottom piece 4. In this way, a positive positioning of the bottom pieces 4 is ensured in a direction perpendicular to the stacking direction T direction. The tongues 6 may be formed in an alternative design as a single, up to the edge 7 continuous strip.

In the Ausfbehrungsbeispie! 4, similar to the example according to FIG. 3, an erected edge 7 is present, wherein the overlapping regions 5 are formed as continuous graduations, similar to the first exemplary embodiment. The straightened and at its end approximately perpendicular to the level of the bottom 3 stationary edge 7 also serves to improve

Fixing the collector box 8 (see Fig. 4). The collector box 8 is from the outside, in an alternative embodiment, also from the inside, flat on the raised edge 7. The cohesive fixing of the box 8 can done by welding along the edge 7 or by soldering.

In the exemplary embodiment according to FIG. 5, furthermore, the surfaces of the erected edge 7 of a respective bottom piece 4 in the stacking direction T are designed as stop surfaces 9, so that the bottom pieces 4 are precisely positioned by abutment against the stop surfaces 9. A corresponding dimensional tolerance with respect to the abutment surfaces 9 is einzuhatten in manufacturing.

In the embodiment of FIG. 6, a differently shaped bottom piece 10 is inserted in the manner of an intermediate piece between each two provided with a passage bottom pieces 4. While the bottom pieces 4 are sheet metal parts similar to those in the previous examples, the intermediate pieces 10 are formed as extruded moldings which are bent at their ends uniformly with the bottom pieces 4 to a respective portion of the rim 7. The cross-sectional shape of the extruded intermediate pieces 10 is substantially H-shaped, with one of the two grooves of the "H" in the stacking direction T facing an adjacent bottom piece 4. The bottom pieces 4 have no stepped overlapping areas, in contrast to the exemplary embodiment according to FIG. but simple plane and at the end portions 7 upturned edges, wherein the edges protrude into the grooves of the spacers 10 and are soldered flat in the grooves with the spacers 10.

In the present embodiments, the floors 3 are each completely constructed from the bottom pieces shown, wherein the collector box 8 without further components directly to the bottom 3 can be fixed. Depending on the shape of the collector box, it may also be provided that the base has specially shaped bottom pieces or end pieces (not shown) at its ends situated in the stacking direction T, by means of which An optimized connection to the end-side end walls of a collector box 8 is achieved.

With regard to its use and further embodiment, a heat exchanger according to the invention can be formed as required.

In particular, it may be a coolant radiator, a charge air cooler or an evaporator and / or condenser / gas cooler of an air conditioning system of a motor vehicle. Your motor vehicle can be a

Passenger car or a commercial vehicle act, in particular a vehicle that is made in small and medium-sized series, such as

Example an agricultural utility vehicle.

It is understood that the respective features of the individual embodiments can be usefully combined depending on the requirements.

Claims

Patent claims

Heat exchanger, in particular for a motor vehicle, comprising a collector with a base (3), a plurality of passages (2) being formed in the base (3). and a stack of flat tubes (1), the flat tubes (1) each being inserted at the end into the passages (2) and secured in a fluid-tight manner,

characterized.

that the base (3) is formed at least in sections from a plurality of base pieces (4) arranged one next to the other in a stacking direction (T) of the flat tubes (1), with at least one of the passages in at least some of the base pieces (4).

(2) Is designed heat exchanger according to claim 1, characterized in that the base pieces (4) are connected to one another in a cohesive manner, in particular by means of soldering in a soldering oven. Heat exchanger according to one of the preceding claims, characterized in that a box (8) of the collector is welded to the bottom

(3) is fixed. Heat exchanger according to one of the preceding claims, characterized in that on at least some of the base pieces

(4) positive means (6) are provided, through which Positive means (6) align the base pieces perpendicular to the stacking direction (T).

5. Heat exchanger according to one of the preceding claims, characterized in that the base pieces (4) have an overlapping area (5) for flat soldering to an adjacent base piece (4), in particular the overlapping area (5) being in the Extends essentially parallel to a plane of the floor (3).

6. Heat exchanger according to one of the preceding statements, characterized in that the base pieces (4) have a raised edge (7) which runs parallel to a long side of the base (3).

7. Heat exchanger according to claim β, characterized in that

A stop surface in the area of the edge (7).

(9) is provided for the positioned contact of an adjacent base piece (4). 8. Heat exchanger according to one of the preceding claims, characterized in that some of the base pieces (10) are designed as intermediate pieces that do not have a passage. θ. Heat exchanger according to claim 8, characterized in that the intermediate pieces (10) are extruded molded parts, in particular with a groove for receiving an edge of an adjacent floor piece (4).

10. Heat exchanger according to one of the preceding claims, characterized in that the base (3) is designed in one or more rows

11. A method for producing a heat exchanger according to one of the preceding claims, comprising the steps:

-Assembling the floor (3) from the floor pieces (4) with mechanical fixation;

-Assembling a block from the flat tubes (1) and ribs arranged between them with mechanical fixation;

-Attach the base (3) to the block; and

-soldering the base (3) and the block together in one

soldering oven.

12. The method according to claim 11, characterized by the step:

-Welding a collector box (8) to the soldered base and block unit.

13. The method according to claim 12, characterized by the step:

-mechanical assembly of a collector box (8) on the base (3) and soldering the collector box (8), base (3) and block together.