EP2929267B1 - Heat exchanger - Google Patents

Description

Technical area

The invention relates to a heat exchanger having a block of first and second flow channels, which are arranged adjacent to one another, wherein the block is open on an inflow side and on an outflow side of the first flow channels for inflow or outflow of a first fluid into or out of the first Flow channels, wherein the second flow channels have openings for the inflow and outflow of a second fluid, in particular according to the preamble of claim 1.

State of the art

Heat exchangers of the above type are known in the art, for example, for exhaust gas cooler or intercooler. In this case, exhaust gas or charge air is used as the first fluid, wherein a liquid coolant is used as the second fluid. The alternating arrangement of the first and the second flow channels causes a favorable cooling of the first fluid.

Such heat exchangers are known, for example, as disk heat exchangers or stacked plate heat exchangers. In disk heat exchangers, pairs of disks are connected to first fluid channels, with a plurality of successive pairs of disks forming the second fluid channels between them. In Stapelscheibenwärmeübertragern same discs are stacked on each other, wherein between the discs alternately first and second fluid channels are arranged.

A disadvantage of the disc or Stapelscheibenkonzepten is the resulting during production of the discs waste or cutting waste.

In heat exchangers in tube bundle design with a tube bundle, wherein the tubes of the tube bundle are welded into tube sheets, the assembly cost is relatively high.

Heat exchangers, in which second channels are arranged in a comb-like manner, so that first channels are formed between adjacent second channels, are, for example, made BE438312 or DE3226984 known.

Presentation of the invention, object, solution, advantages

Therefore, it is the object of the present invention to provide a heat exchanger above, which is easy to build up and with a reduced use of materials.

The object of the present invention is achieved by a heat exchanger with the features of claim 1.

An embodiment of the invention relates to a heat exchanger with a block of first and second flow channels, wherein the block is open on an inflow side and on an outflow side of the first flow channels for inflow and outflow of a first fluid into or out of the first flow channels, wherein the second flow channels have openings for the inflow and outflow of a second fluid, wherein the block consists of a first element and a second element, the first and the second element each form second flow channels and a side wall, wherein the elements are joined together so that the two side walls form opposite side walls of the block and the second flow channels extend between the side walls and form first flow channels between them and the side walls. This ensures that the existing number of second flow channels with the two side walls together form the block and record the first flow channels between the two second flow channels. Also preferably two second flow channels form the remaining side walls of the block, so that it is enclosed on four sides by a wall. These two flow channels are preferably two outer second flow channels. As a result, the entire block is formed by two elements. Possibly. In addition, it is also expedient if still turbulence inserts are inserted into the flow channels.

According to the invention, the second flow channels and the side wall of an element are made of a part by embossing and folding. In this case, the element is for example made of strip material, embossed and folded, so that between two layers of the strip material, a flow channel can flow the fluid of the first flow channel. By a circumferential embossing and a subsequent soldering or otherwise sealing the plurality of second flow channels can be formed.

Furthermore, it is expedient if the second flow channels and the side wall of an element are formed comb-like. As a result, it is easy to form a side wall and second flow channels protruding therefrom.

According to the invention, the second flow channels of one element engage between the second flow channels of the other element. This ensures that the two side walls face each other and the second flow channels are aligned parallel to each other.

Likewise, according to the invention, the second flow channels of an element are supported the side wall of the other element from. This will be a seal reaches the first flow channels, since they are arranged between the second flow channels.

Furthermore, it is expedient if the side wall of an element has at least one abutment region or abutment regions which serve to abut at least one end region or end regions of the second flow channels. These investment areas serve to support and secure placement before connecting or soldering, so that a defined position can be reached.

Furthermore, it is expedient if a second flow channel has an inlet and / or outflow opening at a region of its fold. Thus, the flow channel may be embossed in the region of the fold in order to achieve an inflow or outflow through the opening thus formed.

It is also expedient if a second flow channel has an inlet and / or outflow opening at one end region. It can thereby be achieved that the second flow channel can be supplied with the fluid from the same side as the other second flow channels which protrude from the other side wall. Thus, collection boxes are not needed on both sides. As a result, a simple configuration can be achieved.

It is particularly expedient if a side wall adjacent to openings in the end region of the second flow channel has openings in the system area. Thus, the openings in the end areas can be supplied.

It is also expedient if the openings for the inflow and / or outflow of a fluid into or out of the second flow channels are arranged on a side wall of the block.

Furthermore, it is expedient if the openings for the inflow of a fluid into the second flow channels are provided with a collector with fluid inlet and the openings for the outflow of a fluid from the second flow channels are provided with a collector with fluid outlet.

It is particularly advantageous if the block is provided on its inflow side and / or on its outflow side of the first flow channels with a collector with inlet or outlet opening.

Advantageous developments of the present invention are described in the subclaims and the following description of the figures.

Brief description of the drawings

Fig.1

eine schematische Ansicht eines erfindungsgemäßen Wärmeübertragers mit einem Block erster und zweiter Strömungskanäle und mit einer Zu- und Abführung eines ersten Fluids,

Fig.2

ein erstes Element zur Bildung des Blocks erster und zweiter Strömungskanäle in einer perspektivischen Darstellung,

Fig.3

ein erstes Element zur Bildung des Blocks erster und zweiter Strömungskanäle in einer perspektivischen Darstellung,

Fig.4

ein zweites Element zur Bildung des Blocks erster und zweiter Strömungskanäle in einer perspektivischen Darstellung,

Fig.5

ein zweites Element zur Bildung des Blocks erster und zweiter Strömungskanäle in einer perspektivischen Darstellung,

Fig.6

ein Block erster und zweiter Strömungskanäle in einer perspektivischen Darstellung,

Fig.7

ein Block erster und zweiter Strömungskanäle in einer perspektivischen Darstellung,

Fig.8

eine weitere schematische Ansicht eines erfindungsgemäßen Wärmeübertragers mit einem Block erster und zweiter Strömungskanäle und mit einer Zu- und Abführung eines ersten Fluids,

Fig.9

eine weitere schematische Ansicht eines erfindungsgemäßen Wärmeübertragers mit einem Block erster und zweiter Strömungskanäle und mit einer Zu- und Abführung eines ersten Fluids, und

Fig.10

ein weiteres Element zur Bildung des Blocks erster und zweiter Strömungskanäle in einer perspektivischen Darstellung.

In the following the invention with reference to an embodiment with reference to a drawing will be explained in detail. In the drawing shows:

Fig.1

1 a schematic view of a heat exchanger according to the invention with a block of first and second flow channels and with an inlet and outlet of a first fluid,

Fig.2

a first element for forming the block of first and second flow channels in a perspective view,

Figure 3

a first element for forming the block of first and second flow channels in a perspective view,

Figure 4

a second element for forming the block of first and second flow channels in a perspective view,

Figure 5

a second element for forming the block of first and second flow channels in a perspective view,

Figure 6

a block of first and second flow channels in a perspective view,

Figure 7

a block of first and second flow channels in a perspective view,

Figure 8

1 is a further schematic view of a heat exchanger according to the invention with a block of first and second flow channels and with an inlet and outlet of a first fluid,

Figure 9

a further schematic view of a heat exchanger according to the invention with a block of first and second flow channels and with an inlet and outlet of a first fluid, and

Figure 10

a further element for forming the block of first and second flow channels in a perspective view.

Preferred embodiment of the invention

The Fig. 1 shows a heat exchanger 1 with a block 2, wherein the block 2 has first flow channels 3 and second flow channels 4. The block 2 is bounded by side walls 5, 6 to the outside and has at the two end faces 7, 8, to which the first flow channels 3 are open to flow, collectors 9, 10, which are provided with inlet and outlet openings 11, 12 ,

A first fluid can enter the collector 9 through the inlet opening 11, then pass through the first flow channels 3 and leave the heat exchanger 1 via the collector 10 and the outlet opening 12.

The end face 7 forms an inflow side of the first flow channels 3 of the block 2, wherein the end face 8, the outflow side of the first flow channels 3 of the Blocks 2 forms. On the inflow side and on the outflow side, the first flow channels 3 are open to inflow or outflow of a first fluid into the first flow channels 3 and out of the first flow channels 3, respectively.

In Fig. 1 Furthermore, it can be seen that the second flow channels 4 are provided on a side wall 6 with openings 13, 14 which serve for the inflow or outflow of a second fluid into the second flow channels 4 or out of the second flow channels 4.

The openings 13, 14 as inflow openings or outflow openings are arranged one above the other in a direction perpendicular to the flow direction 15 of the first fluid. The openings 13 are arranged adjacent to the inlet of the first fluid at an end region of the second flow channels 4, wherein the openings 14 are arranged adjacent to the exit of the first fluid in the end region of the second flow channels 4. When the second fluid is flowed through the heat exchanger in countercurrent to the first fluid, the openings 14 represent the inflow opening and the openings 13 the outflow openings. With a flow through the co-current, the openings would reverse.

The FIGS. 2 and 3 show in a perspective view a first element 20, the second flow channels 21 and a side wall 22 has.

The first element 20 is formed of a strip material, being made by embossing and folding. The second flow channels 21 are double-walled and are formed by folds in the region of the side wall 22 at 23 and at the end regions 24 of the second flow channels. The second flow channels 21 have an embossment 25 on the edge, so that the upper side 26 can be connected at the edge to the underside 27 of the flow channel in order to generate a flow volume within the second flow channel 21. At the end regions 24, the second flow channels 21 are provided with the openings 28, 29 in order to allow a second fluid to flow into the second flow channel 21 or to flow out of the second flow channel 21. The side wall 22 has arcuate regions 30 which serve as abutment regions for abutment of end regions of two flow channels 21.

The side walls 22 have at their end portions angled ends 31 which serve to fix second flow channels 21 which project from an opposite side wall onto the present side wall.

The 4 and 5 show a second element 40 in a perspective view with second flow channels 41 and a side wall 42. The element 40 is preferably again formed of a strip material by embossing and folding, wherein the second flow channels 41 are again formed double-walled, with a respective contacting edge, so that between the edges of a volume is formed to achieve a flow. The flow channels 41 protrude from the side wall 42 substantially rectangular and comb-like, wherein the flow channels have openings 43, which serve the inflow or outflow from the flow channel. Furthermore, the side wall 42 has abutment regions 45, which serve to abut end regions 46 of the second flow channels. In the embodiment of 4 and 5 has the second element in the area of the contact areas 45 openings 47, which serve for the flow through second flow channels, which are arranged or applied in the contact area 45.

The 6 and 7 show a block 50 of first flow channels 51 and second flow channels 52. The first flow channels 51 are formed between the second flow channels 52. The block 50 consists of a first element 53 and a second element 54 according to the Fig. 2 to 5 , which are connected to each other such that the two flow channels 52 of the first element and the second element 53, 54 are mutually intermeshed, wherein the ends 55 of the flow channels 52 at the contact areas 56 of the side walls 53, 54 come into contact. The openings 28, 29 of the Fig. 2, 3rd aligned with openings 47 of the Fig. 4, 5 , so that an inflow and outflow into the second flow channels is possible, which are supported in their end regions at contact areas and which have their openings for inflow and outflow at these end regions.

The 8 and 9 show the heat exchanger 1 in other perspective views, wherein the block 2 can be seen from different sides. The side wall, which faces the side wall with the openings 13, 14, has no openings.

Furthermore, it can be seen that the collectors 9, 10 have a central inflow or outflow opening 11, 12 which is surrounded by a flange 16 in order to be able to connect the heat exchanger to a supply line, for example for exhaust gas or charge air.

The Fig. 10 shows an enlarged view of an arrangement of second flow channels 60 with side openings 61 for the inflow and outflow of a fluid. Embossments 63 are provided on the edge regions 62 in order to seal the flow channels against one another. No embossing is provided between these edge regions, so that the inlet or outlet openings 61 can be formed. The outer flow channels have a fold 64 in this area in order to be able to stably define the edges of the opening 61.

It is particularly advantageous if embossed dimples or beads are provided in the first and / or second flow channels for flow guidance. This can advantageously bring about a better cooling performance, reduced temperature peaks in poorly flowed through areas and / or improvements in the process by supporting the wall areas. This is particularly preferred in an embodiment of the heat exchanger for using a gaseous first fluid and a liquid second fluid, such as an exhaust gas coolant cooler, such as an indirect charge air cooler, in which the charge air is cooled by liquid coolant.

Furthermore, at least one of the flow channels may be formed without an inserted turbulence insert. For this purpose, the corresponding flow channel can have a wavy profiled separating surface for generating turbulences in the first and / or in the second fluid channels. This embodiment is preferred in liquid first and second fluid, such as in an oil-coolant radiator.

For this purpose, an inserted turbulence insert, in particular a turbulence insert, can be provided in the flow channel for the first fluid in the first and / or second fluid channel. This is preferred with gaseous first fluid.

The heat exchanger is preferably designed as a cross-flow or cross-countercurrent heat exchanger. Preferably, no collecting boxes for the first fluid are provided. It is preferably a design for heat exchangers with a large cross-section for the first fluid, in particular for a heat exchanger of components in a cooling module in the incoming air of the vehicle, such as a coolant radiator, oil cooler, air conditioner etc.

As materials of the heat exchanger is preferably steel or aluminum or an aluminum alloy.

As exemplary embodiments of a collector of the second fluid, it is possible, if this is provided with a circumferential curl, to increase the contact surface and possibly to achieve a better soldering result and possibly a higher strength. Alternatively, it is also a staple form in which the collector also includes the folded matrix above and below.

The collector can also be stapled to it in the manufacturing process for positioning on other elements of the heat exchanger, such as by tack welds.

It is particularly advantageous if both sides consist of the same, repetitive comb or loop contour, which, however, differ by different positions of the openings for the first and the second fluid. It is particularly advantageous if the two comb profiles have the identical structure, but if necessary they differ by the number of channels for the second fluid can. The flow through the heat exchanger would then be referred to as the Z-flow with an odd number of channels for the second fluid.

It may also be advantageous if an additional base and cover plate is provided to facilitate a positive connection between the collector for the first fluid and the matrix, and to increase the strength.

Furthermore, the heat exchanger can also be designed as a so-called one-shot soldering, and if necessary, including holder and other peripheral parts are soldered in one.

Claims (9)

1. A heat exchanger having a block (2, 50) of first (3) and second (4, 21, 41) flow ducts, wherein the block is designed to be open at an inflow side (11) and at an outflow side (12) of the first flow ducts (3) for the inflow and outflow of a first fluid into and out of the first flow ducts (3), wherein the second flow ducts (4, 21, 41) have openings (13, 14) for the inflow and outflow of a second fluid, wherein the block (2, 50) is composed of a first element (20) and of a second element (40), wherein the first and the second element each form second flow ducts (4, 21, 41) and a side wall (22, 42), wherein the elements are joined together such that the two side walls (22, 42) form opposite side walls of the block (2, 50) and the second flow ducts (4, 21, 41) extend between the side walls (22, 42) and form first flow ducts (3) between themselves and the side walls, characterised in that the second flow ducts (4, 21, 41) and the side wall (22, 42) of an element (20, 40) are manufactured from one part by stamping and folding and the second flow ducts (4, 21, 41) of one element (20, 40) engage between the second flow ducts (4, 21, 41) of the other element (20, 40), wherein the second flow ducts (4, 21, 41) of one element (20, 40) are supported on the side wall (22, 42) of the respective other element (20, 40).
2. The heat exchanger as claimed in claim 1, characterised in that the second flow ducts (4, 21, 41) and the side wall of an element are of comb-like configuration.
3. The heat exchanger as claimed in claim 1 or 2, characterised in that the side wall of an element (20, 40) has at least one abutment region (45), or abutment regions, which serve for the abutment of at least one end region, or end regions, of the second flow ducts.
4. The heat exchanger as claimed in at least one of the preceding claims, characterised in that a second flow duct (4, 21) has an inflow and/or outflow opening (28, 29) in a region of its fold.
5. The heat exchanger as claimed in at least one of the preceding claims, characterised in that a second flow duct (4, 41) has an inflow and/or outflow opening (43, 44) in an end region.
6. The heat exchanger as claimed in claim 3, characterised in that a side wall has openings (47) in the abutment region adjacent to openings in the end region of the second flow duct.
7. The heat exchanger as claimed in one of the preceding claims, characterised in that the openings for the inflow and/or outflow of a fluid (28, 29, 43, 44) into or out of the second flow ducts are arranged on a side wall of the block.
8. The heat exchanger as claimed in one of the preceding claims, characterised in that the openings for the inflow of a fluid into the second flow ducts are equipped with a manifold with a fluid inlet, and the openings for the outflow of a fluid out of the second flow ducts are equipped with a manifold with a fluid outlet.
9. The heat exchanger as claimed in one of the preceding claims, characterised in that the block is equipped, on its inflow side and/or on its outflow side of the first flow ducts, with a manifold (9, 10) with an inflow and/or outflow opening.

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