EP1668304B1 - Heat exchanging unit for motor vehicles - Google Patents

Description

The invention relates to a heat exchanger unit according to the preamble of claim 1 for motor vehicles with a first heat exchanger having two spaced apart and substantially parallel manifolds which are fluidly connected to each other via a plurality of parallel arranged and spaced in the longitudinal direction of the manifolds connecting pipes ,

Such heat exchanger units are made JP 11337292 already known. They are used for example as a coolant radiator in motor vehicles.

In a heat exchanger unit known to the applicant, two manifolds, which have a rectangular cross-section perpendicular to their longitudinal axis, are connected by connecting pipes. In this design, an inlet and an outlet is provided.

In another, known to the applicant design of a heat exchanger two cylindrical manifolds are fluidly connected via connecting pipes, which also here an inlet and an outlet are provided. Furthermore, the applicant is aware that two different heat exchangers are joined together or arranged close to each other, one of which is a coolant radiator and the other is an air conditioning condenser on the air conditioning system.

The invention has for its object to provide a heat exchanger unit for motor vehicles, which is reliable, fluidically designed low and is inexpensive to produce.

According to the invention, a heat exchanger unit according to claim 1 is proposed.

In the following, exemplary or preferred embodiments of the invention are described in more detail with reference to the figures, whereby the invention should not be limited.

Fig. 1 shows an exemplary design of a heat exchanger unit 1 according to the invention in a partially schematic view.

The heat exchanger unit has a first heat exchanger 10, which is designed as a coolant radiator for a motor vehicle, and a second heat exchanger 12, which is designed as a climate condenser for a motor vehicle. Shown is also a first manifold 14 of the second heat exchanger 12, which is designed here in cross-section perpendicular to its longitudinal axis in two parts, but may also be designed in one piece. In cross-section perpendicular to the longitudinal axis of this first manifold of the second heat exchanger 12 has a substantially annular shape. Further, a heat exchanger block 16 is shown, which has a plurality of designed as flat tubes connecting tubes for the first heat exchanger 10 and a plurality of connecting tubes for the second heat exchanger 12th

The connecting tubes 18 connect the first manifold 20 of the first heat exchanger 10 with a second manifold of the first heat exchanger 10, not shown, fluidically. In a bottom wall 22, which is part of a jacket wall 26 extending around the longitudinal axis 24 of the first heat exchanger 10, and faces in the second header of the first heat exchanger 10, a plurality of openings or slots for receiving the headers 18, the first Heat exchanger 10 are assigned, provided. These slots 28 are asymmetrical with respect to the width 30, which is schematically indicated by the arrow 32 arranged. This asymmetry is such that its respective central axis, schematically indicated by reference numeral 34, is positioned closer to the second end 36 of the bottom wall 22 than the first end 38 of the bottom wall located at the other end.

At the second end 36 of the bottom wall 22, a second wall portion 40 connects, which extends at the indicated by the arrow 42 side of the bottom wall 22, which faces away from the second manifold of the first heat exchanger 10. Furthermore, extending from the first end 38 of the first manifold 20 of the first heat exchanger 10, a first wall portion and a first wall 44, also on the second manifold of the first heat exchanger 10 opposite side of the bottom wall 22nd

The wall 44 and the bottom wall 22 are each designed planar, and are substantially perpendicular to each other. The wall 44 moves away - seen in the direction of the width 32 of the bottom wall 22 - progressively from the first end 38 of the bottom wall, if - as indicated schematically by the arrow 50 - along this second wall in the plane perpendicular to the longitudinal axis 24 increasingly the first end 36 of the bottom wall approximates. The bottom wall 22 opposite wall 52 of the jacket wall 26 is designed substantially flat.

In the design according to Fig. 1 a, the wall 40 is convexly curved.

In Fig. 1a the wall 44 is shown disassembled.

In the transverse to the longitudinal axis 24 of the first manifold 20 of the first heat exchanger 10 cross section, the peripheral wall 26 is thus designed in two parts, and has a first, substantially U-shaped part, the bottom wall 22, the second wall 40 and the bottom wall 22 opposite wall 52 has.

The second part of this two-part design essentially has the first wall 54, which, however, has at its ends substantially perpendicularly angled flanges 54, 56, which overlap in the mounted state are arranged with the end portions of the bottom wall 22, and the bottom wall of the opposite wall 52.

The connection can be made for example by soldering or by welding, or by laser welding or by another suitable connection method.

At the two Axialendseiten of the first manifold 20 of the first heat exchanger 10, an axial end cover 56 is provided in the assembled state, which is also shown here disassembled. Also, this cover can be attached, for example, with the said connection method.

Furthermore, in Fig. 1a a stub 58 is shown, which opens into the first wall, or an opening 60 provided there, and is thus fluidly connected to the inner tube of the first manifold 20 of the first heat exchanger 10.

• Fig. 1b zeigt die Gestaltung gemäß Fig. 1 in montiertem Zustand.
• Fig. 1c zeigt eine Draufsicht der Gestaltung gemäß Fig. 1b. Dort ist insbesondere auch zu erkennen, dass das Sammelrohr 14 des ersten Wärmetauschers 12 im senkrecht zur Längsachse gelegenen Querschnitt zweiteilig gestaltet ist. Ferner ist in Fig. 1c gut zu erkennen, dass die Mittelachse 34 der Verbindungs- bzw. Flachrohre 18 des ersten Wärmetauschers 10 näher an dem zweiten Ende 36 der Bodenwand 22 gelegen ist, als an dem ersten Ende 38 dieser Bodenwand.

As indicated by the dashed line 66, the second wall 40, which is designed convexly curved, has a flow-guiding function, so that they fluid fluid flow of the inflowing through the inlet opening 58 fluid in the direction of the connecting tubes or flat tubes 18, or in the Bottom wall 22 provided slots 66 promotes.

• Fig. 1b shows the design according to Fig. 1 in assembled condition.
• Fig. 1c shows a plan view of the design according to Fig. 1b , There, it can also be seen in particular that the collecting tube 14 of the first heat exchanger 12 is designed in two parts in the cross section perpendicular to the longitudinal axis. Furthermore, in Fig. 1c It can be clearly seen that the central axis 34 of the connecting or flat tubes 18 of the first heat exchanger 10 is located closer to the second end 36 of the bottom wall 22 than at the first end 38 of this bottom wall.

This is illustrated by the distance a clarifying the distance between this center line 34 and the first end 36, and the distance b the distance between this center line 34 and the first end 38. In the design according to Fig. 1c is further shown, a first manifold 20 of the first heat exchanger 10, the manifold 14 of the second heat exchanger 12 contacted, which, however, may also be given differently, and in particular at a small distance.

Furthermore, in Fig. 1c illustrates that the second heat exchanger 12 of the connecting tubes 18 of the first heat exchanger having different connecting tubes, which are provided here with the reference numeral 70.

In Fig. 1c It is further shown that the first manifold 20 of the first heat exchanger 10 in the direction facing the first wall 44 projects beyond the connecting or flat tubes 18 of the first heat exchanger.

Femer is according to the design Fig. 1c clearly recognizable that the second wall or the second wall portion of the first manifold 20 of the first heat exchanger 10 is disposed on the second heat exchanger side facing the first manifold 20, and the first wall or the first wall portion 44 of the first manifold 20th of the first heat exchanger on the side facing away from the second heat exchanger side of the first manifold 20 of the first heat exchanger 10th

In the design according to the Fig. 1a to 1c All flat or connecting pipes 18 of the first heat exchanger open into the same inner space 80 of the first header 20 of the first heat exchanger or of the second header of the first heat exchanger 10, respectively.

However, it can also be provided that the interior space 80 of one or more of these manifolds is subdivided into different sections spaced apart in the axial direction of the respective manifold by intermediate walls.

Fig. 2 shows essentially the design according to the Fig. 1a - 1c However, although there, the first side wall 44 is not shown. Based on Fig. 2 in particular, an assembly tool will be explained.

Shown is in Fig. 2 a mounting tool 90 for mounting a heat exchanger having a bottom wall 22, and a wall opposite the bottom wall and a wall opposite thereto wall 22 and the bottom wall connecting wall 40, said walls a substantially, or very roughly, U- form a shaped structure.

The tool 90 has a tool body 92 having a plurality of parallel and axially spaced slots on the side. The tool 90 can be inserted into the U-shaped profile of the manifold 20, the U-shaped profile is held on the tool 90. In particular, it can be provided that the tool body 92 is substantially adapted to the corresponding U-shaped profile in its shape.

The laterally arranged slots, which extend out of the tool body 92 when mounted in the direction of the open side of the U-shape, serve to receive the flat tubes or connecting tubes 18. During assembly, the U-shaped portion of the manifold 20 is gripped and placed with its openings or slots on the connecting pipes 18. The connecting tubes 18 then extend through the bottom wall 22 and protrude into the slots 94 of the tool body 92. Subsequently, the tool body or the tool, as indicated schematically by the arrow 100, are again pulled out of the U-shaped part. The substantially continuous connecting slots 94 allow the corresponding removal of the tool 100. Before or after the removal of the tool, the connecting or flat tubes 18 can be connected to the bottom wall 22, such as soldered and / or welded. Then then the first wall 44 can be placed laterally and also with a suitable Connection methods, such as soldering and / or welding are attached to the U-shaped part.

Then then the end cover 56 can be placed.

Fig. 3 shows an exemplary design of a heat exchanger unit according to the invention, which in particular also according to the Fig. 1a -1c can be designed, and / or can be such that they are using a tool according to Fig. 2 can be mounted.

In Fig. 3 In particular, it is shown that the cross section of the interior of the first manifold 20 of the first heat exchanger 10 of the longitudinal axis 24 of this manifold changed.

This is in the design according to Fig. 3 such that the inlet stub 58 of the first heat exchanger 10 is arranged in a first axial end region 90 of the first header tube 20 of the first heat exchanger 10, and the cross section of the interior of this first header tube 20 in the direction of the opposite end region 92, the second end region of the header tube 20th , rejuvenated.

In the design according to Fig. 3 this is so that the wall 94 facing the bottom wall 22 increasingly moves toward the bottom wall 22 in the direction of the second end region 92. This the bottom wall 22 opposite wall 52 is in the design according to Fig. 3 just designed.

By means of such a course of the wall, it can be taken into account that the fluid flowing in through the inlet connection 58 flows partly through the connecting tubes located in the upper region, so that in the lower end region of the collecting tube 20 facing the second end region 92 smaller amount of fluid flows, and at constant cross-section would be given a correspondingly high pressure drop.

In a particularly preferred embodiment, the cross-sectional profile in the direction of the longitudinal axis of the one collecting tube or, in particular, of the first collecting tube is adapted to the volumetric flow of the fluid in that this respective axial region of the respective collecting tube flows through.

Fig. 4a shows an exemplary, inventive design, the design according to the Fig. 1a - 1c similar and, where appropriate, also according to the design in Fig. 3 can be trained.

In the design according to Fig. 4a is unlike the design according to the Fig. 1a - 1c provided that the first manifold 20 of the first heat exchanger 10 is designed substantially in one piece in the cross section lying perpendicular to the longitudinal axis of this manifold.

Fig. 4b shows the design according to Fig. 4a in perspective view.

Claims (29)

1. A heat exchanging unit for motor vehicles, having a first heat exchanger that has two headers situated essentially parallel to one another at a distance from one another, connected to one another fluidically via a multiplicity of connecting pipes that are situated parallel to one another and at a distance from one another in a longitudinal direction of the headers, wherein the jacket wall of the respective header, extending around the respective longitudinal axis of the respective header, is limited in the direction facing the respective other header by a flat wall segment, the pipe floor, and wherein the connecting pipes stand perpendicular to these flat pipe floors, wherein further a first wall segment of the jacket wall of this first header is connected in a first end area of the pipe floor of the first header and wherein a second wall segment of the jacket wall of this first header is connected in the opposite, other end area of this pipe floor, wherein further an inlet connecting piece opens into this first wall segment that is connected fluidically to the interior of the first header and wherein an outlet connecting piece opens in one of the headers that is connected fluidically to the interior of the relevant header, wherein the connecting pipes open into the first header asymmetrically with respect to the width of the pipe floor oriented perpendicular to the longitudinal axis of the first header, characterised in that the second wall segment, in the cross-section regarded perpendicular to the header longitudinal axis, increasingly approaches the first end area or first end of the pipe floor as it extends away from the second end area of the pipe floor in the direction regarded perpendicular to the longitudinal axis of the connecting pipes and perpendicular to the longitudinal axis of the header, wherein the second wall segment of the first header of the first heat exchanger is convexly curved or has convexly curved segments, regarded in the cross-section perpendicular to the header longitudinal axis, and in that the first header is limited at the side of the jacket wall facing away from the connecting pipes by a flat wall segment, or a flat wall, and in that the first wall segment has a flat construction.
2. The heat exchanging unit according to one of the preceding claims, characterised in that the inlet connecting piece extends perpendicular to the longitudinal axis of the connecting pipes.
3. The heat exchanging unit according to one of the preceding claims, characterised in that the connecting pipes open asymmetrically into the pipe floor in such a way that their central longitudinal axes are at a greater distance from the first end of the pipe floor than is the central longitudinal axis of the pipe floor.
4. The heat exchanging unit according to one of the preceding claims, characterised in that the connecting pipes are formed as flat pipes.
5. The heat exchanging unit according to claim 4, characterised in that the flat pipes are situated in such a way that the planes fixed by them are situated parallel to one another and perpendicular to the longitudinal axis of the first header of the first heat exchanger.
6. The heat exchanging unit according to one of the preceding claims, characterised in that it has a first heat exchanger having two headers that are essentially parallel to one another and are situated at a distance from one another and that are connected to one another fluidically via a multiplicity of connecting pipes situated parallel to one another and at a distance from one another in the longitudinal direction of the headers, wherein the jacket wall of the respective header, extending around the respective longitudinal axis of the respective header, is limited in the direction facing the respective other header by a flat wall segment, the pipe floor, and wherein the cross-section of the interior of at least one of these headers changes, preferably tapers, along its longitudinal axis.
7. The heat exchanging unit according to one of the preceding claims, characterised in that the first header of the first heat exchanger changes in its cross-section along its longitudinal axis.
8. The heat exchanging unit according to one of the preceding claims, characterised in that the first header of the first heat exchanger tapers in its cross-section along its longitudinal axis.
9. The heat exchanging unit according to one of the preceding claims, characterised in that the inlet connecting piece is situated in a first axial end area of the first header.
10. The heat exchanging unit according to claim 9, characterised in that the cross-section of the first header of the first heat exchanger tapers in the direction of the second axial end area of the first header.
11. The heat exchanging unit according to one of the preceding claims, characterised in that the cross-section of the first header of the first heat exchanger tapers from its first axial end in the direction of the opposed, second axial end, in that the wall segment, situated opposite the floor wall, of the jacket wall of the first header of the first heat exchanger runs increasingly toward the floor wall along the longitudinal axis of the first header, in the direction oriented towards the second axial end.
12. The heat exchanging unit according to one of the preceding claims, characterised in that the first header is constructed in one piece in the cross-section situated perpendicular to its longitudinal axis.
13. The heat exchanging unit according to one of the preceding claims, characterised in that in the cross-section situated perpendicular to its longitudinal axis, the first header is constructed in multiple parts, in particular in two parts.
14. The heat exchanging unit according to one of the preceding claims, characterised in that in the cross-section situated perpendicular to its longitudinal axis, the first header is constructed in two parts, wherein the dividing plane is situated essentially parallel to the longitudinal axis of the connecting pipes.
15. The heat exchanging unit according to claim 14, characterised in that the dividing plane is situated in the area of the wall having the first wall segment.
16. The heat exchanging unit according to claim 15, characterised in that the wall having the first wall segment has an essentially flat construction, and has, at its end areas in the jacket direction of the first header, flanges that are bent off in essentially perpendicular fashion and that are connected in overlapping fashion to an end segment of the floor wall and of the wall situated opposite the floor wall.
17. The heat exchanging unit according to one of the preceding claims, characterised in that the second wall segment of the first header of the first heat exchanger has a fluidic conducting function for the fluid supplied through the inlet connecting piece, and diverts this fluid flowing through the inlet connecting piece in the direction of the connecting pipes, or supports this deflection.
18. The heat exchanging unit according to one of the preceding claims, characterised in that the flat pipes essentially have the same width and are situated such that they are positioned one over the other so as to essentially coincide.
19. The heat exchanging unit according to one of the preceding claims, characterised in that the first heat exchanger is a radiator of a motor vehicle.
20. The heat exchanging unit according to one of the preceding claims, characterised in that fluid flows through the connecting pipes essentially in parallel and in the same direction of flow.
21. The heat exchanging unit according to one of the preceding claims, characterised in that a second heat exchanger is provided that is different from the first heat exchanger and that has a separate fluid circuit.
22. The heat exchanging unit according to claim 21, characterised in that the second heat exchanger has two parallel headers situated at a distance from one another that are connected to one another fluidically via a multiplicity of connecting pipes situated in parallel.
23. The heat exchanging unit according to one of claims 21 and 22, characterised in that the second heat exchanger is an air-conditioning condenser of a motor vehicle.
24. The heat exchanging unit according to one of the preceding claims, characterised in that the first and/or the second heat exchanger is made of aluminium, and is preferably made essentially completely of aluminium.
25. The heat exchanging unit according to one of claims 21 to 24, characterised in that the first and the second heat exchanger are connected to one another.
26. The heat exchanging unit according to one of the preceding claims, characterised in that a sealing end plate is provided axially at the end of at least one of the headers, on one or both ends of the header, in particular on both axial ends of the first header of the first heat exchanger.
27. The heat exchanging unit according to claim 26, characterised in that at least one cover plate of the first heat exchanger, situated axially on the end of a header, is a cover plate of the second heat exchanger, or is connected to such a cover plate.
28. The heat exchanging unit according to one of claims 21 to 27, characterised in that the second wall, or the second wall segment, of the first header of the first heat exchanger faces the second heat exchanger, and the first wall, or the first wall segment, is situated on the side of the first heat exchanger facing away from the second heat exchanger.
29. The heat exchanging unit according to one of the preceding claims, characterised in that the outlet connecting piece opens into the second header of the first heat exchanger.

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