DE102009050888A1 - Heat exchanger e.g. exhaust gas heat exchanger, for recirculation and cooling of exhaust gas of diesel engine of motor vehicle, has housing provided with housing casing, where housing casing and pipes are designed one-piece - Google Patents

Abstract

The exchanger (1) e.g. exhaust gas heat exchanger (2), has a housing (3) provided with a housing casing (4) and two housing cover walls, and bases provided with openings. Pipes (9) are formed as a flow channel (14) for conveying fluid i.e. exhaust gas, where ends of the channel are arranged in the openings of the bases. The pipes and the bases are arranged within the housing, so that another flow channel (15) is formed between the housing and the pipes for conveying other fluid i.e. coolant. The housing casing and the pipes are designed one-piece. Independent claims are also included for the following: (1) a method for manufacturing a heat exchanger (2) an arrangement for recirculation and cooling of exhaust gas of an internal-combustion engine.

Description

The invention relates to a heat exchanger according to the preamble of claim 1, a method for producing a heat exchanger according to the preamble of claim 6 and an arrangement for returning and cooling exhaust gas of an internal combustion engine according to the preamble of claim 15.

Heat exchangers, in particular exhaust gas heat exchangers, are used for various technical applications for the transfer of heat from a first fluid to a second fluid. In this case, both the first and the second fluid flows through the heat exchanger and the heat is transferred from the first to the second fluid or vice versa. In an exhaust gas heat exchanger exhaust gas is passed as the first fluid through a plurality of tubes designed as flat tubes. Coolant is passed around the flat tubes as the second fluid. Thus, heat is transferred to the cooling liquid from the hot exhaust gas and thus the exhaust gas is cooled.

Exhaust heat exchangers generally have a housing, two floors with openings and a plurality of tubes, the ends of which are arranged in the floors. The tubes with the two floors are arranged inside the housing, so that form a first flow channel in the tubes for the exhaust gas and a second flow channel between the tubes for the cooling liquid in the heat exchanger. The components of the heat exchanger generally consist of metal, in particular aluminum, and are preferably bonded together by means of soldering. Due to the high number of components of the exhaust gas heat exchanger made of aluminum, a difficult, complex and expensive production of the exhaust gas heat exchanger is required.

The DE 103 49 140 A1 shows a heat exchanger, in particular for a motor vehicle with a heat exchanger block, which on the primary side of a first medium through which can flow and on the secondary side of a second medium durchströmmbare pipes with flow channels and pipe ends. The pipe ends are arranged in end pieces, each with at least one bottom plate. The first medium can be conducted from an inlet chamber through the flow channels to an outlet chamber. A casing jacket enclosing the pipes has an inlet and an outlet for the second medium.

The WO 03/093751 A2 shows a heat exchanger, in particular charge air cooler for a motor vehicle, with at least one box with at least one chamber for dividing and / or collection of a flowing medium and at least one tube bundle, which consists of tubes which are communicatively connected to the at least one chamber, wherein the at least a box has a tube plate with openings into which the tubes of the tube bundle can be inserted, wherein at least one tube is formed at least in a region which is inserted in an opening of the tube plate, at least double-walled.

The object of the present invention is therefore to provide a heat exchanger, a method for the production of a heat exchanger and an arrangement for the return and cooling of exhaust gas of an internal combustion engine, which is simple and inexpensive to manufacture and ensures reliable operation of the heat exchanger, in particular has a sufficient tightness.

This object is achieved with a heat exchanger, in particular exhaust gas or charge air heat exchanger, comprising a housing with a housing shell and two Gehäusedeckwandungen, a first and a second bottom with openings, tubes as the first flow channel for passing a first fluid, in particular exhaust gas whose ends in the Openings of the first and second bottom are arranged, wherein the tubes and the first and / or second bottom are arranged within the housing, so that between the housing and the tubes, a second flow channel for passing a second fluid, in particular a cooling liquid is formed, wherein the housing shell and the tubes are integrally formed. The housing shell and the tubes are integrally formed, so that on the one hand they are very simple and inexpensive to manufacture and on the other hand no leaks between the housing shell and the tubes may occur and in the production of a connection of the housing shell with the tube in a separate manufacturing step is not required is, so that thereby costs can be saved in the production of the heat exchanger.

In particular, the housing shell and the tubes are manufactured as an extrusion profile part. The casing shell and the tubes are made by extrusion, making it particularly inexpensive and easy even with complex geometries with many tubes possible.

In a weitren embodiment of the housing shell and the tubes are integrally formed in a section perpendicular to an axis of the tubes. The axis is preferably a centric axis of the tubes, in particular flat tubes.

In a supplementary embodiment, the housing shell and the tubes and preferably the tubes are interconnected by means of webs and the webs are integrally formed with the housing shell and the tubes. By means of the webs, the tubes and the housing shell can be reliably connected to each other.

In an additional embodiment, the housing shell, the tubes and the webs are made as an extrusion profile part. The housing shell, the pipes and the webs are produced by extrusion. Thus, the pipes can be safely and reliably connected by means of the webs with the housing shell and the pipes with each other by means of the webs. Even a complex arrangement of many tubes within the housing shell can be easily, reliably and inexpensively manufactured in the production by extrusion.

Method according to the invention for producing a heat exchanger, in particular a heat exchanger described in this patent application, comprising the steps of: providing a housing with a housing jacket and two housing cover walls, providing pipes, arranging and fixing the pipes within the housing, so that a first Flow channel for passing a first fluid through the tubes is formed and second flow channel for passing a second fluid within the housing and outside the tubes is formed, wherein the housing shell and the tubes are extruded as an extrusion profile, so that the tubes are arranged and fixed within the housing shell are due to the extruding. The housing shell and the tubes are made by extrusion, so that the manufacture of the housing shell and the tubes is simple and inexpensive even with complex geometries with many tubes and on the other hand, an additional connection in another manufacturing or manufacturing step of the tubes with the housing shell is not required because already when extruding the extrusion profile, the tubes are connected to the housing shell due to the geometry of the extrusion profile. Thus, a further manufacturing step can be saved over the prior art and on the other hand is thus also a safe and reliable connection of the tubes with the housing shell possible. Due to the saved manufacturing step, the costs for the production of the heat exchanger can also be lowered.

Preferably, webs are extruded on the extrusion profile and the webs are used to fasten the pipes to the housing jacket and the pipes are fastened to one another with the webs and / or the extrusion profile is extruded from metal, in particular aluminum. The webs are extruded during extrusion of the extrusion profile, so that by means of the webs, the tubes are attached to the housing shell and also the tubes are fastened to each other by means of the webs. In this case, even complex geometries of the extrusion profile, in particular with many pipes, can be produced easily and inexpensively during extrusion. Due to this manufacturing method, a reliable sealing of the first and second flow channels within the extrusion profile is easily possible, because the first and second flow channel is produced within the extrusion profile during extrusion, so that a subsequent sealing and connection of components of the heat exchanger, namely the tubes and the Housing jacket, in a separate manufacturing step is no longer required. Due to the formation of webs, the tubes can also be arranged at any distance from the housing shell and also any distance between the tubes for forming the second flow channel, in particular for a cooling liquid, is possible.

In one variant, extrusion profile parts are separated from the extrusion profile. After extruding the extrusion profile with an extrusion die or an extruding extrusion profile parts are separated in predetermined lengths of the extrusion profile, z. B. sawn off or cut off. This extrusion profile parts, which were separated from the extrusion profile, are then further processed to produce the heat exchanger according to the invention.

The webs are expediently removed in the region of two ends of the extrusion profile part. At the two ends of the extrusion profile part, wherein the extrusion profile part already has the tubes and the housing jacket after extrusion, a first and second bottom are to be inserted into the ends. So that a second flow channel is formed after the bottom within the extrusion profile part, in particular for passing a cooling liquid, in which the second fluid can flow perpendicular to an axis of the tubes between the tubes, it is necessary to partially remove the webs in the region of the ends. Because of this partial removal of the webs in the region of the ends of the extrusion profile part, the tubes are still firmly and reliably disposed within the housing shell due to existing extruded residual webs. The webs in the region of the ends can for example be cut out or clamped out.

In a further embodiment, a first floor and a second floor with openings are provided and the first floor and second floor are at the two ends of the Extrusionsprofilteiles attached so that the tubes are disposed in the openings of the first and second bottom and spaces between the tubes of the first bottom and second bottom are closed. Due to the arrangement of the first and second bottom with the openings at the ends of the housing shell and the extrusion profile part, the first flow channel is sealed fluid-tight at the ends of the extrusion profile part, because there is a fluid-tight connection between the tubes and the openings of the bottom.

In particular, an inlet opening and an outlet opening are incorporated in the housing shell for introducing and discharging the second fluid. An inlet opening and an outlet opening are required for introducing and discharging the second fluid, so that the second fluid in the second flow channel, which is formed between the housing shell, the first and second floor and outside the tubes, the second fluid, in particular the cooling fluid, can be in and out. In this case, the second fluid or the inlet and outlet opening is introduced to the effect that the heat exchanger is a heat exchanger according to a direct current or countercurrent principle.

In a further embodiment, a first diffuser and a second diffuser are each provided as Gehäusedeckwandung available.

In a supplementary variant, the first diffuser for introducing the first fluid into the tubes is attached to the extrusion profile part with the first bottom and the second bottom in the region of the first bottom and in the region of the second bottom of the second diffuser for discharging the first fluid from the Pipes attached. The first diffuser as the top wall of the housing is required so that the exhaust gas can be introduced into the pipes through an inlet opening for the exhaust gas at the first diffuser. Due to the existing first bottom at the end of the extrusion profile part or the housing shell, the first fluid, namely exhaust gas, does not flow into the second flow channel for cooling fluid. The second diffuser as the housing cover wall serves to selectively collect the exhaust gas flowing out of the tubes at the end in the first flow passage within the second diffuser, and then selectively discharge it through an exhaust outlet port on the second diffuser.

In a further variant, the extrusion profile part, the first bottom, the second bottom and / or the first diffuser and / or the second diffuser are bonded together, in particular by means of soldering. The components of the heat exchanger, namely the extrusion profile part, the first and / or second bottom and the first and / or second diffuser are or are plated with a solder. After joining the extruded extrusion profile part, with the first and second bottom and the attached first and second diffuser, these components can be introduced into a brazing furnace and soldered together there. As a result, there is a fluid-tight connection between the first and second bottom with the openings and the tubes arranged therein as well as the two diffusers on the extrusion profile part or the housing shell. Thus, the heat exchanger can be easily manufactured with a few manufacturing steps.

Arrangement according to the invention for returning and cooling exhaust gas of an internal combustion engine, in particular a diesel engine, comprising an exhaust gas line, preferably with an exhaust gas turbine, a charge air line with a charge air compressor drivable by the exhaust gas turbine, an exhaust gas recirculation line for conducting exhaust gas from the exhaust gas line to the charge air line, an exhaust gas heat exchanger for cooling exhaust gas in the exhaust gas recirculation line and / or a charge air heat exchanger for cooling charge air in the charge air line in the flow direction of the air after the charge air compressor, preferably an exhaust gas control element for controlling and / or regulating the amount of exhaust gas per unit time which can be conducted through the exhaust gas return line and / or or preferably a charge air control member for controlling and / or regulating the amount of charge air which can be conducted through the charge air line per unit time, wherein the exhaust gas heat exchanger and / or the charge air heat exchanger as an i n this protective right application described heat exchanger are designed and / or manufactured.

In a further embodiment, turbulence inserts are arranged inside the tubes, in particular flat tubes. The turbulence inserts, for example baffles, serve to generate a turbulent flow for the flow of the first fluid through the tubes, to increase the heat transfer from the first fluid to the second fluid or vice versa.

In a further embodiment, ribs or turbulence inserts, ie. H. within the second flow channel, in particular for the cooling liquid arranged. As a result, as turbulent a flow as possible when flowing around the tubes by means of the second fluid, in particular the cooling liquid can be achieved.

In the following, an embodiment of the invention will be described in more detail with reference to the accompanying drawings. It shows:

1 a cross section of a heat exchanger and

2 a section AA of the heat exchanger according to 1 ,

As exhaust gas heat exchanger 2 trained heat exchanger 1 serves to cool exhaust gas by means of cooling liquid. The exhaust gas heat exchanger 2 has a first flow channel 14 for passing a first fluid, namely exhaust gas on. A second flow channel 15 for passing a second fluid, namely cooling liquid, serves to transfer heat from the exhaust gas to the cooling liquid and thereby to cool the exhaust gas ( 1 and 2 ). The exhaust gas heat exchanger 2 is used in an arrangement not shown for recycling and cooling of exhaust gas of an internal combustion engine to cool the exhaust gas from the engine by means of coolant of the internal combustion engine and then again after cooling in the exhaust gas heat exchanger 2 a charge air duct, not shown, for further combustion in a combustion chamber of the internal combustion engine.

The exhaust gas heat exchanger 2 has a variety of flat tubes 10 trained pipes 9 on the inside of a casing 4 a housing 3 the exhaust gas heat exchanger 2 are arranged. The pipes 9 with each other and the connection between the flat tubes 10 and the housing shell 4 is by means of webs 12 executed ( 1 and 2 ). The flat tubes 10 are used to pass exhaust gas and a gap that extends inside the housing shell 4 trained and outside the flat tubes 10 is present, serves for the passage of cooling liquid as a second fluid. The housing jacket 4 , the footbridges 12 as well as the flat tubes arranged therein 10 are doing by extrusion from an extrusion profile part 13 produced. By means of an extruding machine, not shown, an extrusion profile with the geometry according to 1 extruded. After extruding the extrusion profile with the extruding machine, extrusion profile parts of the extrusion profile are produced 13 separated with a respective same length, in particular cut off. The extrusion profile part 13 has two ends 20 on. At the ends 20 of the extrusion profile part 13 or the housing shell 4 become the webs 12 in a direction parallel to an axis 11 the pipes 9 from the extrusion profile part 13 away. This can be done in the ends 20 of the extrusion profile part 13 each a first floor 6 and a second floor 7 , each with openings 8th , to be inserted. The openings 8th have the outer geometry of the flat tubes 10 on, leaving the flat tubes 10 in the openings 8th of the first and second floor 6 . 7 can be inserted. The first and second bottom is thus within the housing shell 4 arranged. This forms a distance between the first and second floor 6 . 7 as well as the rest of the webs 12 from which were not removed. Because of this distance between the first and second floor 6 . 7 as well as the existing remaining webs 12 Can the coolant between the pipes 10 also in a direction perpendicular to the axis 11 the pipes 10 stream. This is necessary for a uniform distribution of the cooling liquid within the second flow channel 15 ,

After attaching the first and second floor 6 . 7 at the two ends 20 of the extrusion profile part 13 , be on the ends 20 each a first diffuser 21 as Gehäusedeckwandung 5 and a second diffuser 22 as Gehäusedeckwandung 5 appropriate. These interconnected components of the heat exchanger 1 namely, the extrusion profile part 13 , the first and second floor 6 . 7 as well as the first and second diffuser 21 and 22 are then soldered together in a soldering oven. This forms a fluid-tight connection between the openings 8th of the first and second floor 6 . 7 and the flat tubes 10 out as well as between the first and second floor 6 . 7 and the extrusion profile part 13 , Further, the first and second diffusers 21 and 22 fluid-tight on the extrusion profile part 13 or the housing shell 4 attached.

An inlet opening 18 for cooling liquid and an outlet opening 19 for coolant as the second fluid becomes after soldering the components 6 . 7 . 13 . 21 and 22 in the housing shell 4 incorporated. Deviating from this, the inlet and outlet 18 . 19 also immediately after the separation of the extrusion profile part 13 be incorporated by the extrusion profile or in the subsequent manufacturing steps, for example after the introduction of the first and second soil 6 . 7 inside the casing 4 ,

In the heat exchanger 1 can thus through an inlet opening 16 for exhaust gas at the first diffuser 21 Exhaust be introduced, which subsequently by the plurality of flat tubes 10 flows and then after flowing through the flat tubes 10 in the second diffuser 22 is collected again and through an outlet opening 17 for exhaust gas controlled from the heat exchanger 1 is discharged. The cooling fluid is through the inlet opening 18 initiated and through the outlet opening 19 discharged.

Overall, considered with the heat exchanger according to the invention 1 and the inventive method for producing the heat exchanger 1 significant benefits. The housing jacket 4 with the large number of flat tubes arranged therein 10 can be made very easily and cheaply by extruding aluminum become. Even with a large number of flat tubes 10 inside the casing 4 can the extrusion profile part 13 be made simple and inexpensive. This manufacturing process ensures a safe and reliable seal. This can reduce the cost of manufacturing the heat exchanger 1 be lowered.

LIST OF REFERENCE NUMBERS

1

Heat exchanger

2

Exhaust gas heat exchanger

3

casing

4

housing jacket

5

Gehäusedeckwandung

6

First floor

7

Second floor

8th

Openings in ground

9

Tube

10

flat tubes

11

Axis of the pipes

12

web

13

Extrusion profile part

14

First flow channel for exhaust gas

15

Second flow channel for coolant

16

Inlet opening for exhaust gas

17

Exhaust opening for exhaust gas

18

Inlet opening for coolant

19

Outlet opening for coolant

20

Ends of the housing shell or extrusion profile part

21

First diffuser

22

Second diffuser

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10349140 A1 [0004]
• WO 03/093751 A2 [0005]

Claims (15)

Heat exchanger ( 1 ), in particular exhaust gas or charge air heat exchanger ( 2 ), comprising - a housing ( 3 ) with a housing shell ( 4 ) and two Gehäusedeckwandungen ( 5 ), - a first floor ( 6 ) and a second floor ( 7 ) with openings ( 8th ), - pipes ( 9 ) as the first flow channel ( 14 ) for passing a first fluid, in particular exhaust gas, whose ends in the openings ( 8th ) of the first and second floor ( 6 . 7 ), wherein - the pipes ( 9 ) and the first and / or second floor ( 6 . 7 ) within the housing ( 3 ) are arranged so that between the housing ( 3 ) and the pipes ( 9 ) a second flow channel ( 15 ) for passing a second fluid, in particular a cooling liquid, is formed, characterized in that the housing jacket ( 4 ) and the pipes ( 9 ) are integrally formed. Heat exchanger according to claim 1, characterized in that the housing shell ( 4 ) and the pipes ( 9 ) as an extrusion profile part ( 13 ) are made. Heat exchanger according to one or more of the preceding claims, characterized in that the housing jacket ( 4 ) and the pipes ( 9 ) in a section perpendicular to an axis ( 11 ) of the pipes ( 9 ) are integrally formed. Heat exchanger according to one or more of the preceding claims, characterized in that the housing jacket ( 4 ) and the pipes ( 9 ) and preferably the tubes ( 9 ) with each other by means of webs ( 12 ) and the webs ( 12 ) are integrally formed with the housing shell and the tubes. Heat exchanger according to claim 4, characterized in that the housing shell ( 4 ), the pipes ( 9 ) and the webs ( 12 ) as an extrusion profile part ( 13 ) are made. Method for producing a heat exchanger ( 1 ), in particular a heat exchanger ( 1 ) according to one or more of the preceding claims, comprising the steps of: - providing a housing ( 3 ) with a housing shell ( 4 ) and two Gehäusedeckwandungen ( 5 ), - providing pipes ( 9 ), - arranging and fixing the pipes ( 9 ) within the housing ( 3 ), so that - a first flow channel ( 14 ) for passing a first fluid through the tubes ( 9 ) is formed and - second flow channel ( 15 ) for passing a second fluid within the housing ( 3 ) and outside the pipes ( 9 ) is formed, characterized in that the housing shell ( 4 ) and the pipes ( 9 ) are extruded as an extrusion profile so that the tubes ( 9 ) within the housing shell ( 4 ) are arranged and fixed due to the extrusion. A method according to claim 6, characterized in that on the extrusion profile webs ( 12 ) are extruded and with the webs ( 12 ) the pipes ( 9 ) on the housing shell ( 4 ) and the pipes ( 9 ) with the webs ( 12 ) are attached to each other and / or the extrusion profile of metal, in particular aluminum, is extruded. A method according to claim 6 or 7, characterized in that from the extrusion profile extrusion profile parts ( 13 ) are separated. Method according to claim 8, characterized in that the webs ( 12 ) in the region of two ends ( 20 ) of the extrusion profile part ( 13 ) are removed. Method according to claim 8 or 9, characterized in that a first floor ( 6 ) and a second floor ( 7 ) with openings ( 8th ) and the first floor ( 6 ) and second floor ( 7 ) at the two ends ( 20 ) of the extrusion profile part ( 13 ) who attached the, so that the pipes ( 9 ) in the openings ( 8th ) of the first and second floor ( 6 . 7 ) and spaces between the tubes ( 9 ) from the first floor ( 6 ) and second floor ( 7 ) are closed. Method according to one or more of claims 6 to 10, characterized in that in the housing shell ( 4 ) an inlet opening ( 18 ) and an outlet opening ( 19 ) is incorporated for introducing and discharging the second fluid. Method according to one or more of claims 6 to 11, characterized in that a first diffuser ( 21 ) and a second diffuser ( 22 ) each as Gehäusedeckwandung ( 5 ) to provide. A method according to claim 12, characterized in that on the extrusion profile part ( 13 ) with the first floor ( 6 ) and the second floor ( 7 ) in the area of the first floor ( 6 ) the first diffuser ( 21 ) for introducing the first fluid into the tubes ( 9 ) and in the area of the second floor ( 7 ) the second diffuser ( 22 ) for discharging the first fluid from the tubes ( 9 ) is attached. Method according to one or more of claims 10 to 13, characterized in that the extrusion profile part ( 13 ), the first floor ( 6 ), the second floor ( 7 ) and / or the first diffuser ( 21 ) and / or the second diffuser ( 22 ) cohesively, in particular by means of soldering, are connected to each other. Arrangement for the return and cooling of exhaust gas of an internal combustion engine, in particular a diesel engine, comprising - an exhaust pipe, preferably with an exhaust gas turbine, - a charge air line with a, preferably driven by the exhaust gas turbine, charge air compressor, - an exhaust gas recirculation line for conducting exhaust gas from the exhaust pipe to the Charge air line, - an exhaust gas heat exchanger for cooling exhaust gas in the exhaust gas recirculation line and / or a charge air heat exchanger for cooling charge air in the charge air line in the flow direction of the air after the charge air compressor, - preferably an exhaust gas control member for controlling and / or regulating the controllable through the exhaust gas recirculation line amount of exhaust gas per unit time and / or preferably a charge air control member for controlling and / or regulating the charge air through the charge air duct amount of charge air per unit time, characterized in that the exhaust gas heat exchanger and / or the Ladeluftwä heat exchanger as a heat exchanger ( 1 ) are formed according to one or more of claims 1 to 5 and / or the exhaust gas heat exchanger and / or the charge air heat exchanger with a method according to one or more of claims 6 to 14 are prepared.

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