DE102005010493A1 - Heat exchanger with flat tubes and flat heat exchanger tube - Google Patents

Heat exchanger with flat tubes and flat heat exchanger tube

Info

Publication number
DE102005010493A1
DE102005010493A1 DE200510010493 DE102005010493A DE102005010493A1 DE 102005010493 A1 DE102005010493 A1 DE 102005010493A1 DE 200510010493 DE200510010493 DE 200510010493 DE 102005010493 A DE102005010493 A DE 102005010493A DE 102005010493 A1 DE102005010493 A1 DE 102005010493A1
Authority
DE
Germany
Prior art keywords
heat exchanger
characterized
exchanger tubes
wall
tubes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE200510010493
Other languages
German (de)
Inventor
Peter Dr. Ing. Ambros
Wolfgang Dipl.-Ing. Knecht (Fh)
Andreas Dipl.-Ing. Stolz
Roland Dipl.-Ing. Strähle (FH)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Modine Manufacturing Co
Original Assignee
Modine Manufacturing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Modine Manufacturing Co filed Critical Modine Manufacturing Co
Priority to DE200510010493 priority Critical patent/DE102005010493A1/en
Publication of DE102005010493A1 publication Critical patent/DE102005010493A1/en
Application status is Pending legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/025Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements
    • F28F3/027Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements with openings, e.g. louvered corrugated fins; Assemblies of corrugated strips
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/04Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
    • F28F3/042Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element
    • F28F3/044Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element the deformations being pontual, e.g. dimples
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/001Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02Header boxes; End plates
    • F28F9/0219Arrangements for sealing end plates into casing or header box; Header box sub-elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00Tubular elements; Assemblies of tubular elements
    • F28F1/02Tubular elements of cross-section which is non-circular
    • F28F2001/027Tubular elements of cross-section which is non-circular with dimples

Abstract

The invention relates to a heat exchanger having an inlet collecting box (1) for distributing the medium into flat heat exchanger tubes (2) or to an outlet collecting box for receiving and passing the medium from the flat heat exchanger tubes (2), the collecting box (1 ) has a wall (3) extending around the periphery of the end (4) of a stack of the heat exchanger tubes (2) and over a certain length portion (5) thereof, the wall (3) having at least one inlet (20) and / or or an outlet (21) for the other medium, which flows between the heat exchanger tubes (2) has, and wherein in the flat heat exchanger tubes (2) an inner insert (15) is arranged, which with the two broad sides (55) of the heat exchanger tube ( 2) is metallically connected. DOLLAR A Further, a flat heat exchanger tube is described. In order to improve the resistance to thermal cycling significantly, the invention has provided that the inner insert (15) with at least one row (95) of cutouts (10) and a gutter (11) is formed to compensate for thermal cycling.

Description

  • The The invention relates to a heat exchanger with an inlet collecting box, around the medium on flat heat exchanger tubes to distribute or with an outlet collection box to the one medium from the flat heat exchanger tubes receive and forward, the collection box a wall which extends around the circumference of the end of a stack of heat exchanger tubes and over a certain length of the heat exchanger tubes extends, wherein the wall at least one inlet and / or a Outlet for the other medium, which flows between the heat exchanger tubes, has, and wherein in the flat heat exchanger tubes an inner insert is arranged, with both broad sides of the heat exchanger tube is metallically connected.
  • Further The invention relates to a flat heat exchanger tube with an inner insert.
  • The heat exchanger described above and a heat exchanger tube are in the non-prepublished European patent application with the application number EP 040 27 604.0 contain. There, a slot at the end of the inner insert was introduced into the same or provided an open towards the end conical cutout. Both measures resulted in a remarkable improvement in the compensation of thermal cycling.
  • The Inventors have set themselves the task described above Heat exchanger in such a way that it can withstand the enormous thermal cycling, For example, in an exhaust gas heat exchanger in an exhaust gas recirculation system, yet better able to withstand, and thus the requirements placed on him even better fulfilled. Furthermore, they want a flat heat exchanger tube suggest that to a higher Thermal cycling capability of it equipped heat exchanger leads.
  • These Task is at a heat exchanger according to the generic term according to the invention the use of the characterizing features of claim 1 solved. The flat according to the invention heat exchanger tube has the characterizing features of independent claim 21 and continuing education characteristics of dependent claims on. In the flat heat exchanger tube can For example, it is welded to a longitudinal seam or to act trailed flat tubes that are part of the heat exchanger. Between the flat tubes Corrugated ribs are arranged through which, for example, cooling air flows through. The Ends of the heat exchanger tubes stuck for example in openings a tube bottom connected to the wall of a collecting tank is. This is the construction known from the prior art, for example an air-cooled Intercooler or a coolant radiator for a motor vehicle. In the area of the ends of the heat exchanger tubes For example, according to the invention, the inner insert has two cutouts with a gutter to compensate for thermal cycling. The mentioned Area extends over the range of direct or indirect connection of the stack the heat exchanger tubes with the wall of the collecting tank. The mentioned area of the heat exchanger tubes or the inner inserts can continue, until about 1/3 of the total length of Inside bets, extend. Practically, the with cutouts and gutters provided area not be much longer than necessary, because the cutouts reduce the size of the heat transferring surface, which known to be in relation to the Performance has a negative impact.
  • Area heat exchanger tubes are those that have a smaller and a larger inner dimension, So not only those with parallel broadsides but for example also heat exchanger tubes with oval cross-section.
  • Area heat exchanger tubes are also in the sense of the present invention, those by two the both broad sides forming plates are formed, whereby the two Narrow sides of the tubes by one between the plates pasted Rod or the like are shown. Such construction finds one in many applications of heat exchangers. They are also found in fuel cell systems, for example.
  • Because the inner insert according to the characterizing part of claim 1 or claim 21 at least in the connecting region of the flat heat exchanger tubes with the wall of the collecting tank has at least one series of cutouts with a gutter to compensate for thermal cycling, the resistance of the heat exchanger according to the invention against thermal cycling was compared again significantly increased with the above-mentioned prior art, as the evaluation has shown carried out extensive series of experiments. The mentioned series can be configured as desired, for example straight or zig-zag. The number of temperature changes that have been achieved has been more than doubled by now, without hitherto causing any breaks or leaks. Improvements in this order They were not expected and they make it clear that even seemingly minor differences from the state of the art can lead to substantial advantages.
  • Interior inserts in the sense this proposal are those whose undulations flanking the Running direction between wave mountains and troughs extend. Training The wave flanks themselves are irrelevant and can therefore in many ways available. It is advantageous if the wave flanks in the longitudinal direction the inner insert are also formed wavy. The can Wave flanks parallel to each other or with a slope be educated.
  • The heat exchanger tubes are in one embodiment preferably by two each, and more preferably by two identical flat tube halves formed, which are connected at their edge flanges. This concept is particularly inexpensive and is characterized by high process reliability, especially in the Soldering out.
  • The heat exchanger tubes have in this embodiment manifestations on that for a distance between the heat exchanger tubes ensure that the distance is one flow channel for the other Medium forms.
  • The manifestations shut down the flow channels for the other Medium to the outside from. As a result, a largely caseless construction principle is realized, This is achieved through economical use of materials with the highest efficiency of heat exchange distinguished.
  • The Wall of the collecting tank has deformations, on the one hand a Contributing to stability and on the other hand a certain elasticity in thermal cycling allow.
  • at the heat exchanger according to the invention is the longitudinal section enclosed by the wall of the collecting tank the heat exchanger tubes of two connecting planes of the wall with the end of the pile of Limited heat exchanger tubes, wherein between the connection levels of the inlet and / or the outlet for the other medium are arranged / is
  • at a first embodiment is in the first connection level a tube plate with webs for Receiving the ends of the stack of heat exchanger tubes provided which is connected to the wall of the collecting tank.
  • One second embodiment has in place of the tube bottom in the first connection plane the peripheral contour of the stack of heat exchanger tubes performing connecting piece on, which is connected to the wall.
  • The second joint plane is directly through the wall of the header tank formed, wherein in the wall, the peripheral contour of the stack of heat exchanger tubes is trained. This allows the wall in cheaper Be prepared as a punched and deep-drawn part. In the Circumferential contour slots are available. In each slot is located an edge flange of a heat exchanger tube. Further are projections formed in the peripheral contour. Each lead closes one Furrow, each at the edge between two adjacent heat exchanger tubes is trained. With these measures will contribute to the achievement of quality soldering results done.
  • at the mentioned second embodiment are the broad sides of the heat exchanger tubes in Provided area of the second connection level with further formations, wherein adjacent heat exchanger tubes with the other formations abut each other and wherein the Height of the others Formations with the height matches the characteristics, around the flow channels between the heat exchanger tubes to disposal to deliver.
  • Especially It is advantageous if flocks of formations in the region of Entry and / or exit of existing between the heat exchanger tubes Flow channels arranged and steer the medium, for example, to cool the tubesheet. In order to can be another additional contribution to the solution the task will be done. Since the formations are soldered, Of course they do also a contribution to the strength.
  • The Invention will be described below in embodiments with reference to FIG attached Drawings described. The description contains further features and effects, which may be first later turn out to be particularly significant.
  • The Figures show the following:
  • 1 Overall view of a heat exchanger of an embodiment;
  • 2 Perspective view of a collection box part of the embodiment;
  • 3 Part of a heat exchanger tube;
  • 4 Part of another heat exchanger tube;
  • 5 false floor
  • 6 one end of a heat exchanger with the intermediate bottom
  • 7 similar 6 but partially showing the inner inserts of the heat exchanger tubes;
  • 8th - 14 various interior inserts for heat exchanger tubes;
  • 15 Extract from 16
  • 16 Partial view of an air-cooled intercooler with heat exchanger tubes having inner inserts;
  • It is in the embodiments of the 1 - 7 to an exhaust heat exchanger, which is involved in a manner not shown in the exhaust gas recirculation system of a motor vehicle and which uses the cooling liquid of the motor vehicle engine as a cooling medium. With the same advantages, the heat exchanger is to be used, for example, as an intercooler cooled by means of coolant or to be used for other purposes, in particular with advantages where high thermal cycling occurs.
  • The present invention should also be understood to mean that the heat exchanger can be flowed through in a U-shape, wherein the inlet 20 and the outlet 21 at one and the same collection box 1a are located. Also for this reason is in the preamble of claim 1 of "an inlet box 1 In the embodiments showing figures, however, is provided at both ends 4 the stack of heat exchanger tubes 2 one collecting box each 1 to arrange. Accordingly flows in the heat exchanger, which in the 1 is shown, the exhaust, for example, the left collection box 1b a, spreads on the heat exchanger tubes 2 flows through them and leaves the heat exchanger via the other (right) collection box 1b , The coolant enters the inlet 20 at the right collecting box 1a a, spreads to the flow channels 51 between the heat exchanger tubes 2 are arranged ( 6 or 7 ) and leaves the heat exchanger via the in the left collection box 1a intended exit 21 , The entry 20 and the exit 21 have an approximately rectangular cross-section in this embodiment. Advantageously, at the collecting boxes 1a each one made by means of forming of sheet metal holder 80 provided, which are around three sides of the collecting boxes 1a extends and is firmly soldered. The holder 80 indicates the entrance 20 or the exit 21 and a suitable sealing groove 81 so that the heat exchanger can be flanged directly to a connection plane, not shown, of an assembly, thus fastened and at the same time "supplied" with cooling liquid The stack of heat exchanger tubes 2 is made of an upper and a lower reinforcement plate 75 ( 7 ), because the sheet thickness of the heat exchanger tubes 2 is relatively small. It should thus be both a protection against mechanical impact on the pipes 2 as well as a higher stability of the entire heat exchanger can be achieved.
  • The 2 shows the collection box 1a in a first embodiment in perspective view, as in the embodiment of the 1 is present twice, except for the cross-sectional shape of the inlet 20 or outlet 21 in the 1 about rectangular and in the 2 is round. The 3 shows one of the existing there seven heat exchanger tubes 2 , The wall 3 of the collecting tank 1a has deformations 17 on, by the way, in the wall 3 of the collecting tank 1b can be provided. ( 1 ) There are also two levels of connection 30 and 40 between the wall 3 and the stack of heat exchanger tubes 2 , In the one connection level 40 is an immediate connection of the wall 3 provided with the stack. The wall 3 has an opening 100 representing the perimeter contour of the stack. These include slots 70 and projections 71 , Every slot 70 is for receiving an edge flange 52 thought that in 3 is shown. Also belongs to the opening 100 an upper and a lower gradation 74 to the reinforcing plates 75 also be able to record in it. In the other connection level 30 on the other hand, there is an indirect connection to the wall 3 present, since in this embodiment, an intermediate tube sheet 22 was provided. For this purpose, the edge of the wall 3 at 9 graded to allow the tubesheet 22 a seat with a stop in the wall 3 Has. The already mentioned slots 70 can also be found in the contour of the tubesheet 22 again, and they serve the same purpose there.
  • From the 2 is a remarkable education at the edge of the opening 100 in the wall 3 to recognize, also on the edge of the apertures of the tubesheet 22 is available. This is that the edge of the opening 100 and the edge of the apertures with only a small amount of draft 101 are formed, but which contributes to the fact that even with a relatively small wall thickness of the wall 3 a perfect solder joint with the pipes 2 is reached. The passage 101 points to the middle of the heat exchanger. The passage 101 is by appropriate design of the punch for the production of the opening 100 realized, and he is thus feasible without additional effort. This training of the opening 100 is present in all embodiments of the exhaust gas heat exchanger, even if the other pictures do not show that in detail.
  • As the 3 also shows lies between the two connection levels 30 and 40 a length section 5 the heat exchanger tubes 2 , The heat exchanger tubes 2 be in stacking direction 8th ( 6 ) to a stack of heat exchanger tubes 2 composed. The reinforcing plates 75 ( 7 ) are added. As will be described below, an inner liner is used 15 in one of two identical flat tube halves 2a . 2 B existing heat exchanger tube 2 inserted. The flat tube halves 2a . 2 B be by means of bent tabs 53 on the edge flange 52 held together. The stack is over the length range 5 the heat exchanger tubes with the collecting boxes 1a assembled, with each edge flange 52 of each heat exchanger tube 2 in the connection layer 40 in a slot available there 70 comes to rest and in the other connection level 30 in a slot available there 70 of the tube bottom 22 sitting. (see above)
  • The 6 and 7 show the situation at one end 4 the heat exchanger tubes 2 or the heat exchanger. As these figures show, is between the heat exchanger tubes 2 each a flow channel 51 formed, through which the cooling liquid can flow. To describe the formation of the flow channels 51 should again on the 3 and 4 be returned. There you can see that the identical flat tube halves 2a . 2 B are provided with formations. Of particular importance are the two at the longitudinal edges of the identical flat tube halves 2a . 2 B extending formations 50 , which are between two joined heat exchanger tubes 2 a flow channel 51 to lock. On the broadsides 55 the heat exchanger tubes 2 There are more surveys 54 , Near the connection level 30 is a series with projections 56 has been provided, which serves to equalize the flow of the cooling liquid, which enters or exits there in the vicinity. (see arrows, 4 )
  • As the 7 further clearly shows are in all heat exchanger tubes 2 corrugated interior inserts 15 , In the interior inserts 15 the embodiment shown are those whose wavy edges 90 are corrugated in the longitudinal direction and in the transverse direction. Is in 7 by the partial longitudinal section shown there, in the picture right, recognizable. Furthermore, it is very easy to see from this illustration that the wave flanks 90 cutouts 10 and gutters 11 exhibit. In this illustrated embodiment are 7 rows 95 round cutouts 10 to recognize, by each a gutter 11 are separated from each other. Thus, the changes in length due to temperature changes in the stacking direction 8th the heat exchanger tubes 2 approved or compensated. In particular, the clarity of improving the resistance to thermal cycling was surprising.
  • Because the temperature changes in an exhaust gas heat exchanger due to the height of the temperature differences and the frequency of temperature changes to limits, which are just with the usual materials (stainless steel, aluminum) and joining techniques - at least considering cost-effective manufacturing processes of mass production - are just feasible The inventors dealt with additional training measures, and they were able to demonstrate their advantage in the experiment. To describe such a measure is again on the 4 Referenced. It is to be discussed a difference that consists in that the projections 56 on the flat tube halves 2a . 2 B were changed. In the area of the connection level 30 were flocks of protrusions 56 concentrated, which direct the incoming cooling liquid so that a substantial part of it first at the connection level 40 is steered before this in the flow channels 51 can continue to flow. Thus, a better temperature compensation should be achieved and thus should also be served the goal to improve the thermal cycling capacity.
  • It has been thought of in an alternative design, the tube sheet 22 through an intermediate floor 26 to replace that in the 5 and 6 is shown. In the 4 is shown that to the flat tube halves 2a . 2 B have to be modified. In short, that's why they got across the broadsides 55 the ends 4 the flat tube halves 2a . 2 B reaching further forms 57 attached, whose height with the height of the along the long sides running characteristics 50 matches. The further formations 57 adjacent heat exchanger tubes 2 lie against each other and each include a flow channel 51 from. That's why can on a traditional tube sheet 22 with bars 25 be waived. As the mentioned figures show, the intermediate floor 26 - in a similar way to the wall 3 in the other connection plane - with slots 70 and protrusions 71 equipped to the peripheral contour of the stack of heat exchanger raw 2 correspond to. The connection of the false floor 26 with the wall 3 is done via a gradation 9 the Wall 3 which has a stop and a seat for the intermediate floor 26 offers, similar to the tubesheet 22 that in connection with the 2 has been described. The peripheral contour in the intermediate floor 26 also has paragraphs 74 for receiving the reinforcing plates 75 on. ( 7 ) By providing an intermediate floor 26 an additional weight and cost reduction is achieved. In the 6 was with the reference number 72 hinted at what was under the furrows 72 to understand, in each case one of the projections 71 protrudes into it.
  • The 8th shows the end of a flat heat exchanger tube 2 with a further modified interior insert 15 , There they own between the broadsides 55 of the heat exchanger tube 2 extending undulations 90 a curved contour, causing them also in the direction between the broadsides 55 are yielding. Such formed from a sheet metal strip and welded heat exchanger tubes 2 can be provided throughout the heat exchanger. From this representation is particularly clear that the rows 95 of cutouts 10 and intermediate bridges 11 over the entire width of the inner insert 15 or the heat exchanger tube 2 extend what is the preferred training. However, within the meaning of the present proposal, rows of 95 be spoken when the cutouts 10 and gutters 11 not in all wavefronts 90 are located. The same applies to the training of the rows 95 itself. Shown are only straight rows 95 , For example, zig-zagging rows 95 are equally useful.
  • The 9 - 14 show another training of the kind that in the flanks 90 the wavy interior inserts 15 a linear wall thinning 16 was incorporated, which serves as a predetermined breaking point. The breaking point 16 goes through all the intermediate bridges 11 therethrough. It is drawn as a line in the mentioned figures, the otherwise different inner inserts 15 show in partial views. These figures make it clear that the shape and size of the cutouts 10 and the gutters 11 , are not subject to any special provisions and therefore can be formed depending on the application, in order to achieve the desired advantages in terms of thermal cycling capacity. As in 10 can be shown, the cross-sectional shape of the cutouts 10 and the size of each cross section from the end of the inner liner 15 be changed towards the middle. In the 10 are also particularly far protruding cantilevers 12 present, which have proven to be very advantageous in the implementation of the soldering process, which is known to take place in a finely tuned temperature range in which the materials are already in a "doughy" state 12 prevent gravity-induced "collapse" in the joints in this condition.
  • The 15 and 16 show the application of flat heat exchanger tubes 2 in connection with an air-cooled intercooler. The charge air cooler has a collection box 1 with a wall 3 , The ends 4 the heat exchanger tubes 2 stuck in openings of a tube plate 22 and they have been soldered in there, for example. The tube sheet 22 represents a connection level 30 The nature of the indirect connection between the wall provided in this example 3 and the heat exchanger tube 2 - Via an intermediate tube sheet 22 - is irrelevant. The sometimes extremely hot charge air flows through the heat exchanger tubes 2 and between the pipes 2 there are corrugated ribs 99 through which cooling air flows. The bridges 25 between the openings in the tubesheet 22 are in cross-section provided with a contour, as is clear from the 6 can be seen to support the flexible behavior under thermal cycling. In the pipes 2 is an indoor use 15 , In the 16 were two pipes 2 cut open to show it. The interior use 15 has rows 95 of cutouts 10 and gutters 11 on, in the longitudinal direction of the inner insert 15 at least a little way into it. Two or three such rows 95 may already be sufficient in this embodiment to achieve the intended effects. The heat exchanger tubes 2 This embodiment are designed as welded flat tubes and have as a further difference to the application as exhaust heat exchanger no surveys on their broadsides 55 , In this case, he can not use cutouts 10 and intermediate bridges 11 provided much larger section of the inner liner 15 with cuts or the like, not shown, the turbulence enhancing training be provided. The interior inserts 15 but can also, as is preferably the case in the application as an exhaust gas heat exchanger, completely closed wave flanks 90 in the mentioned much larger section.
  • The Application of the described features causes fractures in the Connection heat exchanger tube / tubesheet much less common.
  • The made of metal parts of the heat exchanger will be needed prepared by known methods, so that they are metallic in the soldering oven can be connected.

Claims (23)

  1. Heat exchanger with an inlet collecting box ( 1 ) to the medium in flat heat exchanger tubes ( 2 ), or with an outlet collection box to the medium from the flat heat exchanger tubes ( 2 ) and forward the collection box ( 1 ) one Wall ( 3 ) which extends around the circumference of the end ( 4 ) a stack of the heat exchanger tubes ( 2 ) and over a certain length ( 5 ) thereof, wherein the wall ( 3 ) at least one inlet ( 20 ) and / or an outlet ( 21 ) for the other medium, which between the heat exchanger tubes ( 2 ), and wherein in the flat heat exchanger tubes ( 2 ) an inner insert ( 15 ) arranged with the two broadsides ( 55 ) of the heat exchanger tube ( 2 ) is metallically connected, characterized in that the inner insert ( 15 ) with at least one row ( 95 ) of excerpts ( 10 ) and a gutter ( 11 ) is designed to compensate for thermal cycling.
  2. Heat exchanger according to claim 1, characterized in that the inner insert ( 15 ) is preferably a corrugated sheet in the longitudinal and transverse direction and a plurality of each by a gutter ( 11 ) separate rows ( 95 ) of excerpts ( 10 ) in the wave flanks ( 90 ) are arranged.
  3. Heat exchanger according to claim 1 or 2, characterized in that a plurality of rows ( 95 ) of excerpts ( 10 ) and several intermediate webs ( 11 ) in the longitudinal direction of the inner insert ( 15 ), wherein the length of the cutouts ( 10 ) provided portion of the inner insert ( 15 ) not more than 1/3 of the total length of an indoor use ( 15 ) and the remaining length of the inner insert ( 15 ) essentially without cutouts ( 10 ) is trained.
  4. Heat exchanger according to claim 1, 2 or 3, characterized in that the size and shape of the cutouts ( 10 ) and the intermediate webs ( 11 ) is variable.
  5. Heat exchanger according to one of the preceding claims, characterized in that the first cutout ( 10 ) at the end of the interior inserts ( 15 ) an open section ( 10 ).
  6. Heat exchanger according to claim 5, characterized in that the first cutout ( 10 ) Cantilevers ( 12 ) through the mountains and valleys of the wavy inner liner ( 15 ) are formed, wherein the cantilevers ( 12 ) are soldered to the inner wall of the heat exchanger tube and during soldering, can support the stability of the connection structure.
  7. Heat exchanger according to one of the preceding claims, characterized in that in the intermediate webs ( 11 ) at least one predetermined breaking point ( 13 ) is incorporated.
  8. Heat exchanger according to claim 1, characterized in that the heat exchanger tubes ( 2 ) preferably by two and particularly preferably by two identical flat tube halves ( 2a . 2 B ) are formed, which at their edge flanges ( 52 ) are connected.
  9. Heat exchanger according to one of the preceding claims, characterized in that the heat exchanger tubes ( 2 ) outward-pointing characteristics ( 50 ) in the stack of heat exchanger tubes ( 2 ) for a distance between the heat exchanger tubes ( 2 ), wherein in each case a respective flow channel ( 51 ) is formed for the other medium.
  10. Heat exchanger according to claim 1, characterized in that the wall ( 3 ) of the collecting tank ( 1 ) Deformations ( 17 ), which on the one hand contribute to the stability and on the other hand allow a certain elasticity in thermal cycling.
  11. Heat exchanger according to one of the preceding claims, characterized in that that of the wall ( 3 ) enclosed length section ( 5 ) of the heat exchanger tubes ( 2 ) of two connection levels ( 30 . 40 ) with the end ( 4 ) of the stack of heat exchanger tubes ( 2 ), whereby between the connection levels ( 30 . 40 ) in the wall ( 3 ) the inlet ( 20 ) and / or the outlet ( 21 ) are arranged for the other medium / is.
  12. Heat exchanger according to claim 11, characterized in that in the first connection plane ( 30 ) a tubesheet ( 22 ) with bars ( 25 ) for receiving the ends of the stack of heat exchanger tubes ( 2 ) provided with the wall ( 3 ) of the collecting tank ( 1 ) connected is.
  13. Heat exchanger according to claim 11, characterized in that in the first connection plane ( 30 ) a the peripheral contour of the stack of heat exchanger tubes ( 2 ) having intermediate bottom ( 26 ) arranged with the wall ( 3 ) connected is.
  14. Heat exchanger according to one of claims 11-13, characterized in that the second connection plane ( 40 ) directly through the wall ( 3 ) of the collecting tank ( 1 ) is formed, wherein in the wall ( 3 ) the peripheral contour of the stack of heat exchanger tubes ( 2 ) is cut out.
  15. Heat exchanger according to claim 14, characterized in that the peripheral contour slots ( 70 ) for receiving the edge flanges ( 52 ) of the heat exchanger tubes ( 2 ) and protrusions ( 71 ) for closing the between two heat exchanger tubes ( 2 ) formed furrows ( 72 ) having.
  16. Heat exchanger after one of the protrude the claims, characterized in that the broadsides ( 55 ) of the heat exchanger tubes ( 2 ) in the area of the first connection level ( 30 ) with further formations ( 56 . 57 ) are provided, wherein adjacent heat exchanger tubes ( 2 ) with the further formations ( 57 or 56 ) abut each other and wherein the height of the further formations ( 57 ) and the level of expression ( 50 ) to the flow channels ( 51 ) between the heat exchanger tubes ( 2 ) to provide.
  17. Heat exchanger according to claim 16, characterized in that the further characteristics ( 57 ) in the region of the inlet or outlet of the flow channels ( 51 are arranged and divide the flow, so that a part of the flow, for example. On the tubesheet ( 22 ) is directed to cool this.
  18. Heat exchanger according to claims 16 and 17, characterized in that the characteristics ( 56 ) are concentrated in flocks and have expedient shapes.
  19. Heat exchanger according to one of the preceding claims, characterized in that the collecting box ( 1 ) is preferably designed in several parts, wherein it has an inlet or outlet collection box ( 1b ) for which a medium which is preferably designed in the manner of a diffuser and an inlet or outlet collection box ( 1a ) for the other medium extending over a certain length ( 5 ) of the end ( 4 ) of the stack of heat exchanger tubes ( 2 ).
  20. Heat exchanger according to one of the preceding claims, characterized that the heat exchanger as by means of liquid cooled exhaust gas heat exchanger in exhaust gas recirculation systems of motor vehicles or used as intercooler.
  21. Flat heat exchanger tube ( 2 ) with an inner insert ( 15 ), with the broadsides ( 55 ) of the heat exchanger tube ( 2 ) is metallically connected, wherein the heat exchanger tube ( 2 ) Is part of a heat exchanger, the at least one collecting tank ( 1 ) with a wall ( 3 ), which directly or indirectly with the heat exchanger tube ( 2 ), wherein the inner liner ( 15 ), changes in length caused by temperature change in the direction approximately transverse to the broad sides ( 55 ) of the heat exchanger tube ( 2 ), characterized in that the inner liner ( 15 ) with at least one row ( 95 ) of excerpts ( 10 ) and a gutter ( 11 ) is designed to compensate for thermal cycling.
  22. Flat heat exchanger tube according to claim 21, characterized in that a corrugated inner insert ( 15 ) is provided, the wave edges ( 90 ) between the broadsides ( 55 ), the cutouts ( 10 ) and the gutter ( 11 ) at least predominantly in the wave flanks ( 90 ) are formed.
  23. Flat heat exchanger tube according to claim 21 or 22, characterized in that the length of the cutouts ( 10 ) and intermediate webs ( 11 ) not more than 1/3 of the total length of an indoor use ( 15 ) should be.
DE200510010493 2005-03-08 2005-03-08 Heat exchanger with flat tubes and flat heat exchanger tube Pending DE102005010493A1 (en)

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DE200510010493 DE102005010493A1 (en) 2005-03-08 2005-03-08 Heat exchanger with flat tubes and flat heat exchanger tube
EP06003570A EP1701125A3 (en) 2005-03-08 2006-02-22 Heat exchanger with flat tubes and flat tube for heat exchanger
US11/367,611 US20060201663A1 (en) 2005-03-08 2006-03-03 Heat exchanger and flat tubes

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EP1701125A3 (en) 2011-10-26
EP1701125A2 (en) 2006-09-13

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