DE19846346C1 - Heat exchanger in layered structure has rectangular configuration in every second layer through extrusion of aluminum or aluminum alloy profile tubes - Google Patents

Abstract

A number of separated, adjacent chassis frames (5) are kept apart by longitudinal ribs (4). There are ribs of aluminum or aluminum alloy in a layer between two layers with profile tubes (2) and crossways to the longitudinal direction of the profile tubes arranged vertically to the wide side (10) of the aluminum tubes. Of three adjacent ribs, a longitudinal edge of the central rib is connected in one piece via cross rib with the longitudinal edge of one of the two adjacent ribs. The opposite longitudinal edge is connected via a further cross rib with the longitudinal edge of the other rib.

Description

DE 196 44 586 A1 includes a heat exchanger known, which is built up in layers. The layers alternately consist of a cross-section rectangular tubular extruded profiles with multiple channels and channels separated from one another by longitudinal webs on the other hand from corrugated fin configurations. It flows through the channels z. B. water or oil and in the longitudinal direction the corrugated ribs z. B. air. The corrugated fins take along their function as spacers for the layers Extruded profiles also function as heat conductors (Enlargement of the heat exchange surface touched) and which is true as a generator of turbulence. The connection of the Corrugated ribs with the outside of the extruded profiles follows by soldering. The end faces of the extruded profiles and possibly the end faces of the through the Wellrip pen formed longitudinal troughs lead into distribution or Sam  mel chambers for the two heat exchangers serve.

Furthermore, the corrugated fins have their entire air ducting length an even profile where improved by the heat transfer, but also the Pressure drop is increased.

In the known case, it is also not possible to Longitudinal bars of the extruded profiles effectively too professional lieren to turbulence to improve heat exchange to generate conditions. Also the ratio of Height of the extruded profiles to the distance between neighboring ones Longitudinal bars of maximum 3: 1 made of extruded green which are not enlarged. After all, it is problema table, anti-corrosion coatings on the air side to attach because after soldering the corrugated fins to the Extruded profiles due to the narrow un then formed accessible longitudinal channels such a coating in the Dipping process is difficult to apply.

GB 2 090 651 A is also a heat rope shear known, which has parallel walls through Longitudinal webs are spaced from each other, being parallel Longitudinal channels are formed. To the turmoil in the Channels to improve the heat exchange conditions are in the parallel walls Embossments extending along longitudinal channels are provided.

DE 94 06 559 U1 shows a hollow chamber profile made of Me tall, with parallel side walls. These are through smooth longitudinal webs spaced apart. Between two mutually adjacent smooth longitudinal webs extend according to an embodiment with corrugated longitudinal webs a height that is only part of the distance between the sides walls. The corrugated webs are each in one level next to the smooth longitudinal webs.

A second embodiment provides that between two adjacent smooth longitudinal webs corrugated longitudinal webs are provided, which also ge each other opposite flat side walls the. This creates longitudinal channels that are once from smooth longitudinal webs and once of corrugated longitudinal webs are limited.

The invention is based on the prior art, the Task to create a heat exchanger that is economically producible, the ste in heat exchange separates the media from one another perfectly contamination caused by the media Avoids areas and depending on the respective Heat exchange conditions an optimization of the media leading areas allowed.

According to the invention, this object is achieved in the features of claim 1.

After that, one of the heat exchangers will now be used Media in channels, which are made of aluminum or Aluminum alloys extruded profile tubes with a  rectangular flat configuration are formed. The Channels are separated from each other by longitudinal bars. The The width of the profile tubes is a multiple of their height. The ratio can be up to about 15: 1. Your ends open at the end are fastened in recesses, which are installed in tube plates, which are a distributor or a collection chamber for that flowing through the channels Limit medium.

Between the layers formed from the profile tubes are now arranged layers that consist of a special len rib arrangement exist. The thin ones made of aluminum or aluminum alloys existing ribbon-like ribs extend at a distance next to each other across the longitudinal direction of the profile tubes and are on the broad sides of the Profile tubes arranged vertically. You decide also the width of these layers. On of three each the adjacent ribs is a longitudinal edge of the middle one Rib at least at their ends with a crossbar the longitudinal edge running in the same plane one of the two adjacent ribs connected in one piece. The ge opposite longitudinal edge of the middle rib is over another crossbar with which he is in the plane stretching longitudinal edge of the other rib also connected in pieces. That way at least end on the side of the ribs, depending on their length as well in intermediate areas, meandering areas created while the areas are adjacent Ribs between the ends enclosing the crossbars Are open to meanders. This design enables to fix ribs on both sides of the profile tubes and there to form by assembly units. These assembly units can then over the ends of the profile tubes to the end tube sheets. Through the open loading It is also possible to rich the ribs and also the  Outside of the profile tubes in the immersion process without any problems to be provided with anti-corrosion coatings.

The invention also allows both the Longitudinal webs of the profile tubes as well as on their broad sides in the course of their manufacture without further measures meet with which increases the turbulence in the channels to be able to get the heat out in this way to improve exchange.

Due to the construction according to the invention, such Heat exchangers, among other things, as charge air coolers find. The media are air and water or air and air in heat exchange. Water will be before moves through the channels of the profile tubes while air flows around the ribs in the longitudinal direction. On Instead of water, other fluids can also be used turn.

An even better definition of the ribs on the Breitsei ten of the profile tubes with the features of the claim 2 scored.

The special rib design according to claim 3 enables it, the ribs at least in the direction of flow of the the medium acting on the ribs lying in front to provide additional sections with turbulators. Such turbulators can by selective or linear forms or recesses of the ribs be educated.

A particularly advantageous embodiment of Turbula goals is seen in the features of claim 4. There after are the turbulators by cross-corrugation of the ribs educated. Such a cross corrugation is no problem possible that the ribs and crossbars made of sheet metal  stamped and then with regard to the end cuts meandering and in relation to the areas between between the meanders. Here the transverse waves can be specifically designed so that a course of heat transfer for thermodynamic reasons (alfa) for the generation of optimal heat transfer / Pressure drop ratios exist over the entire length is.

According to the features of claim 5, the front open ends of the ribbed profile tubes in Recesses from distribution chambers or collecting chambers for limit the medium flowing through the profile tubes Tube plates attached. The attachment is convenient by soldering.

Since the profile tubes made of aluminum or an aluminum Alloy extruded is the size of a heat exchanger according to the features of claim 6 thereby easily variable that using multiple profile tubes their narrow sides adjacent to each other butting in a row. In the In this case, the ends of these profile tubes can only be in one single recess of a tube sheet.

To increase the turbulence in the channels of the profile Pipes it is conceivable according to claim 7 that the Breitsei ten of the profile tubes with punctual pressed into the channels ellen or elongated troughs are provided. By an appropriate distribution of the troughs over the length Such a turbulence can be seen in a profile tube be witnessed that optimal heat transfer / Pressure drop ratios according to the thermodynami requirements over the entire length. Furthermore, it is designed accordingly Troughs possible to deform the longitudinal webs, so that  the straightness of the longitudinal webs to increase the turbu lenz and thus to improve the heat transfer conditions conditions is canceled.

If according to the features of claim 8 Longitudinal webs due to deformation of the extruded profile tubes get an S-shaped cross section, the straight middle sections of the longitudinal webs obliquely to the Broad sides run, it is within the scope of the invention advantageously possible the ratio of the height the channels to the distance of the longitudinal webs to ver largely change, and that over the previously from extruded technology maximum adjustable ratio of 3: 1 (The distances between the webs can theoretically be reduced to zero.). This can also do that Ratio of heat exchange area per unit volume be increased significantly. The S-shaped cross section of each Longitudinal web can already be pre-programmed during extrusion are extruded by using certain bending points the. It is then only necessary to insert the profile tubes in the load across the broad sides and together press as required by the exchange relationships gene.

The features of claim 9 can also be improved compression. In this case be sit the longitudinal webs V-shaped cross sections, whose Parting parallel to the broadsides stretching plane. These cross sections can also by means of a pre-programmed bending frame len during extrusion and subsequent compression the profile tubes are generated. But it is also conceivable that embossing strips are drawn through the channels that each have a longitudinal bead on one side, the press the longitudinal webs in the center so that when closing  press the profile tubes together over the broad sides desired V-shaped cross sections.

In the context of the invention it is useful if the measure men according to claims 7 to 9 not together in one Shift. In every shift expedient only the same profiling measures be applied.

The invention is based on in the drawings gene illustrated embodiments explained in more detail. Show it:

Figure 1 is a perspective schematic representation of a section of a heat exchanger with layered profile tubes and fin configurations.

FIG. 2 shows an enlarged perspective illustration of a detail from FIG. 1 with a layer of profile tubes and two adjacent layers of fin configurations; FIG.

Figure 3 is a schematic perspective flow view of the manufacture of a rib configuration.

Figure 4 is a top view of a length portion of a rib configuration;

Fig. 5 is a diagram of the course of the heat transfer (alpha) over a partial length of the rib configuration of Fig. 4;

Fig. 6 in an enlarged view a cross section of a profile tube;

Fig. 7 is a cross section of a deformed section tube;

Figure 8 shows a cross section through a deformed profile tube according to another embodiment.

Fig. 9 shows a cross section through an embossing bar and

Fig. 10 in a perspective schematic illustration in terms of its broad sides deformed profile tube.

1 in Fig. 1 is a block-shaped compact heat exchanger made of an aluminum alloy in the form of a charge air cooler, the way in layer construction on the one hand extruded profile tubes 2 with a rectangular flat configuration and on the other hand rip pen configurations 3 .

A profile tube 2 according to FIG. 1 is shown in more detail in FIG. 6. The ratio of the width B to the height H is 6: 1. The longitudinal webs 4 formed during extrusion produce channels 5 which extend over the entire length of a profile tube 2 . The length is determined by the dimensions of the heat exchanger 1 . The ratio of the height H to the width B1 of the channels 5 is 3: 1.

As can also be seen from FIG. 1, the ends 6 of the profiled tubes 2 are fastened, in particular soldered, in recesses 7 fitted to the profiled tubes 2 in a tube plate 8 . The tube sheet 8 delimits a distribution chamber for one of the media in the heat exchange (here water), which flows through the profile tubes 2 according to the arrow PF, in a manner not illustrated in any more detail.

At the other end of the profile tubes 2 there is also a corresponding tube sheet which limits a collection chamber for the medium water, not shown in more detail.

In addition, it can be seen from FIG. 1 that in the layers with the profile tubes 2, a plurality of profile tubes 2 are arranged with their narrow sides 9 abutting one another in series ne.

Fig. 7 shows an embodiment of a profile tube 2 a, in which the longitudinal webs 4 a separating the channels 5 a have an S-shaped cross section between the broad sides 10 a. The straight central sections 11 run obliquely to the broad sides 10 a. 1 can be formed. Such a profile tube 2a is generated by exerting pressure P on the broad sides 10 of a profile tube 2 according to FIG 6, so that the ratio of the height H1 of the profile tube 2 a to the width B2 of the channels 5 a is greater than 3 can. The narrow sides 9 a run at the same angle to the broad sides 10 a as the central sections 11 of the longitudinal webs 4 a.

In FIG. 8 is a profile tube 2 b is illustrated, in which the b, the channels 5 b longitudinal separating bars 4 Zvi rule the broad sides aufwei sen 10 b V-shaped cross-sections, the apex 12 in a plane extending to b parallel to the broad sides 10 EE run. It can also be seen here that the ratio of the height H _{2 of} the profile tube 2 b to the width B3 of the channels 5 b can be formed to be greater than 3: 1. The narrow sides 9 b of the profile tube 2 b are compared to the cross section of the longitudinal webs 4 b.

The cross-sectional profile of the profile tube 2 b of FIG. 8 can be predetermined by corresponding bending points during extrusion and then generated by applying pressure P on the broad sides 10 of a profile tube 2 according to FIG. 6.

However, it is also conceivable that an embossing strip 13 according to FIG. 9 is drawn through the channels 4 of a profile tube 2 according to FIG. 6 after extrusion. By the longitudinal bead 14 at the embossing strip 13 bends 4 are then in turn to the pre-programmed longitudinal webs containing 10 staltung Querschnittsge the compression load of the broad sides of the longitudinal webs 4 b of FIG. Permit. 8

In Fig. 10 it is shown that by selectively pushing both wide sides 10 c of a profile tube 2 c, in selective form of troughs 15, whereby the longitudinal ribs 4 c are deformed, which in the channels 5 flowing medium c water in turbulence is added and mixed so that an improved heat exchange can be achieved. The troughs 15 can be pressed into the broad sides 10 c in such a targeted manner that an optimal heat transfer / pressure drop profile in the channels 5 c can be ensured.

The manufacture of a rib configuration 3 according to FIGS. 1 and 2 can be seen from FIG. 3.

For this purpose, an aluminum strip 16 is moved through a punch, not shown, and narrow rectangular recesses 17 are made in the aluminum strip 16 here. There arise in this way the edges of the aluminum bands 16 rich in the longitudinal direction closed Be 18th In addition, parallel to the randse-term areas 18 between these extending areas 19 are created in such a number as are necessary for the respective design factors of a heat exchanger 1 .

Within the scope of the invention, it can be assumed, as can also be seen from FIG. 2, that 2 edge regions 18 and a central region 19 are present.

After punching the recesses 17 , the edge regions 18 are separated at 33 in the example of embodiment after every tenth recess 17 ( FIG. 3) and then the surfaces 20 between the central region 19 and the edge regions 18 are provided with transverse shafts 21 . These transverse waves 21 then have an approximately zigzag shape.

After generating the cross shafts 21, the direction in longitudinal continuous regions 18 are 19 such U-shaped deformed such that three adjacent, with cross shafts 21 provided ribs 22, 23, 24 a longitudinal edge 25 of the central rib 23 by means of transverse webs 26 with the longitudinal edge 27 of the adjacent rib 22 , which extends in the same plane, and the opposite longitudinal edge 28 of the rib 23 are connected via further transverse webs 29 to the longitudinal edge 30 of the other rib 24 , which extends in this plane. The rib configuration 3 then arises, as can be seen in particular from FIG. 2.

This rib configuration 3 is then soldered across the transverse webs 29 as well as via the transverse shafts of the ribs 22 , 23 , 24 to the broad sides 10 of the profiled tubes 2 joined together via their narrow sides 9 , where a rib configuration 3 is provided on both broad sides 10 of the profiled tubes 2 is. As a result, an assembly unit 31 is formed ( FIG. 2), which can be handled by itself and can be inserted into the recesses 7 of the tube sheets 8 in the manner shown in FIG. 1 via the ends 6 of the finned tubes 2 and can be soldered to the tube sheets 8 is.

The transverse shafts 21 of the ribs 22 , 23 , 24 , which act as turbulators, serve, as can be seen in particular from FIGS. 4 and 5, to increase the turbulence of the medium according to arrow PF1 in the longitudinal direction of the ribs 22 , 23 , 24 . It can be seen from the diagram according to FIG. 5 belonging to FIG. 4 that, in comparison to the Mercer equation, where there is an essentially linear flow (solid curve), a curve (shown at points) is generated by the transverse waves 21 , After which the course of the heat transfer (alfa) is designed to generate optimal heat transfer / pressure drop ratios.

Reference list

1

- heat exchanger

2nd

- Profile tubes from

1

2nd

a- profile tube

2nd

b- profile tube

2nd

c- profile tube

3rd

- Rib configurations

4th

- Longitudinal bars from

2nd

4th

a- longitudinal bars of

2nd

a

4th

b- longitudinal bars of

2nd

b

4th

c- longitudinal bars of

2nd

c

5

- channels in

2nd

5

a- channels in

2nd

a

5

b- channels in

2nd

b

5

c channels in

2nd

c

6

- ends of

2nd

7

- Cutouts in

8th

8th

- tube sheet

9

- narrow sides of

2nd

9

a- narrow sides of

2nd

a

9

b- narrow sides of

2nd

b

9

c- narrow sides of

2nd

c

10th

- Broad sides of

2nd

10th

a- broadsides of

2nd

a

10th

b- broad sides of

2nd

b

10th

c- broadsides of

2nd

c

11

- middle sections of

4th

a

12th

- crown of

4th

b

13

- Embossing bar

14

- Longitudinal bead on

13

15

- hollows in

10th

c

16

- Aluminum tape

17th

- Cutouts in

16

18th

- marginal areas of

16

19th

- central areas of

16

20th

- areas between

18th

and

19th

21

- cross waves

22

- rib

23

- rib

24th

- rib

25th

- Long edge of

23

26

- Crossbars between

22

and

23

27

- Long edge of

22

28

- Long edge of

23

29

- Crossbars between

23

and

24th

30th

- Long edge of

24th

31

- assembly unit

32

- Section

22

,

23

,

24th

33

- separating cut
B-width of

2nd

B1- width of

5

B2- width of

5

a
B3- width of

5

b
EE level through

12th

H- height of

2nd

H1- height of

2nd

a
H2- height of

2nd

b
PF arrow
PF1 arrow

Claims (9)

1. Heat exchanger in layered construction, which in every second layer is formed by extrusion of aluminum or an aluminum alloy profile tubes ( 2 , 2 a-c) rectangular configuration with a plurality of adjacent channels separated by longitudinal webs ( 4 , 4 a-c) ( 5 , 5 a-c) and between each two layers with profiled tubes ( 2 , 2 a-c) a layer with spacing next to one another transversely to the longitudinal direction of the profiled tubes ( 2 , 2 a-c) and to the broad sides ( 10 , 10 a-c) of the profiled tubes ( 2 , 2 a-c) vertically arranged ribs ( 22 , 23 , 24 ) made of aluminum or an aluminum alloy, in which of three adjacent ribs ( 22 , 23 , 24 ) a longitudinal edge ( 25 ) of the central rib ( 23) at least at their ends via a transverse web (26) with extending in the same plane longitudinal edge (27) of one of the two adjacent ribs (22) and the constricting gegenüberlie longitudinal edge (28) via a further transverse web (29) of the other rib (24) are integrally connected with the said plane extending in the longitudinal edge (30). 2. Heat exchanger according to claim 1, wherein the ribs ( 22 , 23 , 24 ) and the transverse webs ( 26 , 29 ) on the broad sides ( 10 , 10 a-c) of the profiled tubes ( 2 , 2 a-c) are attached flat. 3. Heat exchanger according to claim 1 or 2, wherein the ribs ( 22 , 23 , 24 ) at least in the flow direction of the ribs ( 22 , 23 , 24 ) acting medium lying at the front length sections ( 32 ) with turbulators ( 21 ) are. 4. Heat exchanger according to claim 3, wherein the turbu lators ( 21 ) by transverse corrugation of the ribs ( 22 , 23 , 24 ) are formed. 5. Heat exchanger according to one of claims 2 to 4, wherein the front ends of the finned profile tubes ( 2 , 2 a-c) in recesses ( 7 ) of distribution chambers or collecting chambers for the medium flowing through the profile tubes ( 2 , 2 ac) delimiting Rohrbö the ( 8 ) are attached. 6. Heat exchanger according to one of claims 1 to 5, in which a plurality of profile tubes ( 2 , 2 a-c) with their adjacent narrow sides ( 9 , 9 a-c) are arranged adjacent to one another in a row. 7. Heat exchanger according to one of claims 1 to 6, in which the broad sides ( 10 c) of the profile tubes ( 2 c) are provided with punctiform or elongated depressions ( 15 ) pressed into the channels ( 5 c). 8. Heat exchanger according to one of claims 1 to 6, in which the channels ( 5 a) in a profile tube ( 2 a) separating longitudinal webs ( 4 a) between the broad sides ( 10 a) have S-shaped cross sections, the straight central sections ( 11 ) run obliquely to the broad sides ( 10 a). 9. Heat exchanger according to one of claims 1 to 6, in which the channels ( 5 b) in a profile tube ( 2 b) separating longitudinal webs ( 4 b) between the broad sides ( 10 b) have V-shaped cross sections, the apex ( 12 ) run in a plane (EE) extending parallel to the broad sides ( 10 b).