US20070114007A1 - Heat exchanger - Google Patents
Heat exchanger Download PDFInfo
- Publication number
- US20070114007A1 US20070114007A1 US11/655,136 US65513607A US2007114007A1 US 20070114007 A1 US20070114007 A1 US 20070114007A1 US 65513607 A US65513607 A US 65513607A US 2007114007 A1 US2007114007 A1 US 2007114007A1
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- US
- United States
- Prior art keywords
- heat exchanger
- housing
- slots
- circumferential
- exhaust gas
- 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.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
- F28D7/1684—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation the conduits having a non-circular cross-section
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
- F01N3/043—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids without contact between liquid and exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/0236—Header boxes; End plates floating elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the invention relates to a heat exchanger, in particular an exhaust gas heat exchanger, heat exchanger, having a fluid channel, such as a tube or multiplicity of tubes, like a tube array, through which a first medium, such as exhaust gas, can flow, and a second fluid channel, such as a housing, through which a second medium, such as a coolant, can flow, the ends of the tube array being connected to the tube plates, for example in a cohesive manner, and the tube plates being connected to the housing, for example in a cohesive manner.
- a fluid channel such as a tube or multiplicity of tubes, like a tube array
- a first medium such as exhaust gas
- a second fluid channel such as a housing
- Such a heat exchanger as an exhaust gas heat exchanger has been disclosed by DE-A 199 07 163 from the applicant.
- the ends of a tube array are accommodated in appropriate openings in a tube plate and are welded to the tube plate.
- the tube array with the two tube plates is arranged in the housing, the tube plates being welded circumferentially to the shell of the housing.
- the tubes are firmly connected to the housing via the tube plate, which can lead to thermal stresses under certain conditions.
- Hot exhaust gas flows through the tubes on the inside and colder coolant flows on the outside and also washes around the inside of the housing.
- the different expansions of tubes and housing shell can lead to stresses which are no longer permissible, which can result, for example, in destruction of the tube-plate connection.
- a heat exchanger such as in particular an exhaust gas heat exchanger, having a fluid channel, such as a tube array, through which a first medium, such as exhaust gas, can flow, and a second fluid channel, such as a housing, through which a second medium, such as a coolant, can flow
- a first medium such as exhaust gas
- a second fluid channel such as a housing
- a second medium such as a coolant
- a sealing element such as a metal bellows, is arranged on the housing, covering and sealing the expansion element.
- the expansion element is formed in one piece with a sealing element.
- the expansion element is formed as a circumferential bead.
- a sealing element such as a metal bellows or another sealing element, for example made of plastic or an elastomer, is arranged on the housing, covering and sealing the expansion element.
- the expansion element can also be formed in one piece with the sealing element, for example as a circumferential bead, which performs the sealing function and the expansion function at the same time.
- the expansion element is at least one region of the housing that is provided with slots. It is expedient in this case if, as an expansion element, the housing or a region of the housing has slots which run transversely with respect to the longitudinal direction of the tubes and in the circumferential direction of the housing, which in each case extend only over part of the circumference and which in the circumferential direction partly overlap slots arranged offset axially.
- At least one group of slots having at least two slots is provided in the housing. It is advantageous if the at least one group of slots is arranged in a central region of the housing, as viewed in the longitudinal direction of the heat exchanger. It is also advantageous if the at least one group of slots is arranged in an end region or close to an end region of the housing, as viewed in the longitudinal direction of the heat exchanger.
- two groups of slots are provided.
- the two groups of slots are arranged in the two end regions or close to the end regions of the housing.
- the groups of slots has at least two or a multiplicity of slots, such as three, four, five, six, etc. slots.
- slots are arranged in the housing or in a group of slots, in each case two extending over less than half the circumference in one of two transverse planes and slotted regions of the other transverse plane being located opposite the non-slotted regions of a transverse plane.
- the slots are spaced apart and are formed in such a way that they run beside one another in a subregion of their extent and leave a narrow land between themselves.
- the slots are spaced apart and are formed in such a way that they run beside one another in a subregion of their extent and leave two narrow lands between themselves.
- the lands are distributed uniformly, as viewed in the circumferential direction of the housing.
- the slots have a teardrop shape in their end regions.
- the slots are introduced into the housing by means of one of the following processes: laser cutting, water jet cutting, sawing, milling, erosion or punching.
- expansion element and/or the sealing element is formed from one of the following materials: metal, steel, elastomer, silicone.
- expansion element and/or the sealing element is connected to a housing part or two housing parts or is formed in one piece with the latter.
- expansion element and/or the sealing element is connected to the housing by welding, soldering, by means of clamping elements or by means of adhesive bonding.
- the housing is capable of expanding in the same way as the tubes. This takes place as a result of elastic deformation of the housing shell in the region of the slots, more precisely between two axially offset slots.
- a metal bellows is arranged on the housing over the region of the slots, ensuring the necessary sealing and at the same time being able to follow the expansions of the housing.
- FIG. 1 shows a perspective view of part of an exhaust gas heat exchanger
- FIG. 2 shows a plan view of part of an exhaust gas heat exchanger
- FIG. 3 shows a side view of the part of the exhaust gas heat exchanger according to FIG. 2 and
- FIG. 4 shows a view of part of the exhaust gas heat exchanger with metal bellows
- FIG. 5 shows an extract of a heat exchanger
- FIGS. 6 a to 6 c show a view of arrangements of slots and lands
- FIG. 7 shows a partial view of a heat exchanger.
- FIG. 1 shows a perspective view of part of a heat exchanger, such as in particular an exhaust gas heat exchanger 1 , having a housing shell 2 which is approximately rectangular in cross section and which, in its end region 3 , is somewhat enlarged in cross section.
- the cross section can also have another geometry, such as round, polygonal, octagonal etc.
- the end 4 reveals the tube plate 5 with rectangular openings to accommodate fluid channels, such as exhaust gas tubes, which are not illustrated.
- the ends of these exhaust gas tubes are—as described, for example, in DE-A 199 07 163 already mentioned—welded to the tube plate which, in turn, is welded circumferentially to the housing shell 3 .
- an opening 7 for the inlet of coolant which is distributed in the interior of the housing region 3 in an annular channel, not illustrated, and from there flows through the heat exchanger on the outer side of the exhaust gas tubes.
- three slots 8 , 9 and 10 running in the circumferential direction of the housing can be seen, the slot 10 being offset axially with respect to the two slots 8 and 9 and likewise being offset in the circumferential direction.
- FIG. 2 shows these slots 9 and 10 in a plan view of the housing 2 / 3 of the heat exchanger 1 .
- the slots 9 and 10 extend in the direction of the circumference of the housing as far as a circular or teardrop-shaped opening 11 or 12 , respectively, which is intended to avoid notch stresses in this region.
- the slot 9 reaches as far as the outer edge 13
- the slot 10 as far as the outer edge 14 .
- the slot 9 runs onward in the circumferential direction from the edge 13 as far as the circular hole 15
- the slot 10 runs onward from the edge 14 as far as the circular hole 16 .
- Both slots 9 and 10 are offset axially approximately by a region of a few mm, for example 5 mm.
- the tube plate is indicated at the front end of the housing 3 by a dashed line 5 .
- the entire exhaust gas heat exchanger 1 is illustrated incompletely in FIGS. 1, 2 and 3 , inasmuch as a seal for the slots 9 and 10 with respect to the outside is missing—this seal, in the form of a metal bellows, will be described in FIG. 4 .
- FIG. 4 shows a view of part of the heat exchanger with the two housing regions 2 and 3 , a metal bellows 20 being arranged between these two regions—said bellows covers the slots, which cannot be seen in this depiction, as have been described in the previous FIGS. 1 to 3 .
- the metal bellows is matched to the cross section of the housing 2 / 3 and tightly connected to the latter via its circumferential edges 21 and 22 . As a result, coolant can no longer emerge to the outside from the interior of the housing via the slots—at the same time this metal bellows 20 is able to compensate for the expansions of the two housing regions 2 and 3 .
- FIG. 5 shows a part of a heat exchanger 100 in which four slots 110 to 113 are introduced into the wall 101 of the housing, the slots being offset axially and in the circumferential direction in such a way that lands, which act as expanding or bending beams, remain between the slots.
- one part of the heat exchanger can expand in such a way that the housing shell of the heat exchanger is flexible as a result of the bending beam or beams and ensures expansion of the housing.
- two bending beams are formed by the lands 120 to 123 for each face of the housing, this being the case on all four faces, that is to say even on the faces which cannot be seen in this view.
- FIGS. 6 a to 6 c show variants of designs of slots and lands which are machined into the housing shell in order to form the bending beams.
- two slots 150 , 151 are formed or introduced into the housing. Between the slots there is a land 153 , which serves as a bending beam. Provided at the ends of the slots are teardrop-shaped cutouts.
- two slots 160 , 161 , 162 are formed or introduced into the housing.
- two lands 163 and 164 which serve as bending beams. Teardrop-shaped cutouts are provided at the ends of the slots.
- the configuration of the slots of FIG. 6 c corresponds substantially to the configuration of FIG. 6 b, the slots being angled over in a region 170 , 171 . These regions can also be curved.
- FIG. 7 shows a partial view of a heat exchanger 200 with fluid channels through which a first medium can flow.
- these are the fluid channels through which the exhaust gas flows.
- a second medium can flow between the fluid channels 201 and possibly around the latter as a further fluid channel, in order to cool the medium in the first fluid channel.
- This second fluid channel is therefore located within the housing 202 .
- a circumferential bead 210 is introduced into the housing at at least one point.
- the housing which is generally at a lower temperature than the inner channels during the operation of the heat exchanger, is able to expand when the inner channels expand on account of the thermal expansion, without destruction of the heat exchanger occurring.
- the bead 210 is in this case constituted, for example, by a semicircular bulge. However, it can also have another form, such as in a folded or meandering configuration.
- the bead can also be bulged inward, that is to say formed as an indentation. During the formation of the bead, it is expedient for the latter to be able to fulfill both expansion characteristics and sealing characteristics.
Abstract
The invention relates to an exhaust-gas thermal conductor, comprising a tube array with exhaust gas flowing therethrough and cooling medium flowing around the same. The tube array is welded to a tube base, connected to the housing. As a result of varying temperature effects on the tubes and on the housing whilst operating the exhaust gas thermal conductor, thermal stresses, as a result of differing expansion of the tubes and the housing, occur. According to the invention, said stresses may be avoided, whereby slots are arranged in the housing sleeve, which are externally sealed by means of a bellows.
Description
- The present application is a divisional of U.S. application Ser. No. 10/493,467, filed Jun. 22, 2004, which is the national stage of PCT/EP02/09487 filed Aug. 24, 2002, the entire contents of which are incorporated herein by reference.
- The invention relates to a heat exchanger, in particular an exhaust gas heat exchanger, heat exchanger, having a fluid channel, such as a tube or multiplicity of tubes, like a tube array, through which a first medium, such as exhaust gas, can flow, and a second fluid channel, such as a housing, through which a second medium, such as a coolant, can flow, the ends of the tube array being connected to the tube plates, for example in a cohesive manner, and the tube plates being connected to the housing, for example in a cohesive manner.
- Such a heat exchanger as an exhaust gas heat exchanger has been disclosed by DE-A 199 07 163 from the applicant. In this known design, the ends of a tube array are accommodated in appropriate openings in a tube plate and are welded to the tube plate. The tube array with the two tube plates is arranged in the housing, the tube plates being welded circumferentially to the shell of the housing. Thus, the tubes are firmly connected to the housing via the tube plate, which can lead to thermal stresses under certain conditions. Hot exhaust gas flows through the tubes on the inside and colder coolant flows on the outside and also washes around the inside of the housing. In particular in the case of relatively long tube lengths of such an exhaust gas heat exchanger, for example for commercial vehicles, the different expansions of tubes and housing shell can lead to stresses which are no longer permissible, which can result, for example, in destruction of the tube-plate connection.
- It is therefore an object of the invention to improve an exhaust gas heat exchanger of the type mentioned at the beginning to the effect that thermal stresses on account of different expansions are reduced or avoided, so that the heat exchanger achieves the service life which is normal in motor vehicles.
- This object is achieved by the features of patent claim 1.
- In a heat exchanger, such as in particular an exhaust gas heat exchanger, having a fluid channel, such as a tube array, through which a first medium, such as exhaust gas, can flow, and a second fluid channel, such as a housing, through which a second medium, such as a coolant, can flow, the ends of the tube array being connected to the tube plates, for example in a cohesive manner, and the tube plates being connected to the housing, for example in a cohesive manner, the object is preferably achieved by the housing having an expansion element.
- It is expedient in this case if a sealing element, such as a metal bellows, is arranged on the housing, covering and sealing the expansion element.
- It can also be advantageous if the expansion element is formed in one piece with a sealing element.
- Furthermore, it is expedient if the expansion element is formed as a circumferential bead.
- It is particularly advantageous, moreover, if a sealing element, such as a metal bellows or another sealing element, for example made of plastic or an elastomer, is arranged on the housing, covering and sealing the expansion element.
- The expansion element can also be formed in one piece with the sealing element, for example as a circumferential bead, which performs the sealing function and the expansion function at the same time.
- It is advantageous in this case if the expansion element is at least one region of the housing that is provided with slots. It is expedient in this case if, as an expansion element, the housing or a region of the housing has slots which run transversely with respect to the longitudinal direction of the tubes and in the circumferential direction of the housing, which in each case extend only over part of the circumference and which in the circumferential direction partly overlap slots arranged offset axially.
- In this case, in one exemplary embodiment, it can be expedient if at least one group of slots having at least two slots is provided in the housing. It is advantageous if the at least one group of slots is arranged in a central region of the housing, as viewed in the longitudinal direction of the heat exchanger. It is also advantageous if the at least one group of slots is arranged in an end region or close to an end region of the housing, as viewed in the longitudinal direction of the heat exchanger.
- In a further exemplary embodiment, it is advantageous if two groups of slots are provided. In this case, it can be advantageous if the two groups of slots are arranged in the two end regions or close to the end regions of the housing. Likewise, it can be expedient if the groups of slots has at least two or a multiplicity of slots, such as three, four, five, six, etc. slots.
- According to a further idea of the invention, it can be expedient if four slots are arranged in the housing or in a group of slots, in each case two extending over less than half the circumference in one of two transverse planes and slotted regions of the other transverse plane being located opposite the non-slotted regions of a transverse plane.
- According to the invention, in a further exemplary embodiment it is expedient if, given an arrangement of two slots per group of slots, the slots are spaced apart and are formed in such a way that they run beside one another in a subregion of their extent and leave a narrow land between themselves.
- In a further embodiment of the invention, it is expedient if, given an arrangement of three slots per group of slots, the slots are spaced apart and are formed in such a way that they run beside one another in a subregion of their extent and leave two narrow lands between themselves.
- It can also be expedient if, given a group of slots, at least two lands or a multiplicity of lands, such as three, four, etc., are formed, as viewed over the circumference of the housing.
- It is likewise advantageous if, given a group of slots with an arrangement of two lands per group, the lands lie opposite one another, as viewed in the radial direction of the housing.
- Moreover, it is expedient if, given a group of slots with an arrangement of two or more lands per group, the lands are distributed uniformly, as viewed in the circumferential direction of the housing.
- It is advantageous if four lands are formed by four slots which partly intersect at four points of the housing, that is to say that in each case two slots partly intersect in a region and thus form the land.
- It is expedient if four times two parallel lands are formed by six slots which partly intersect at four points of the housing.
- It is also expedient if the slots have a teardrop shape in their end regions.
- Moreover, it is expedient if the slots are introduced into the housing by means of one of the following processes: laser cutting, water jet cutting, sawing, milling, erosion or punching.
- It is also advantageous if the expansion element and/or the sealing element is formed from one of the following materials: metal, steel, elastomer, silicone.
- Likewise, it is expedient if the expansion element and/or the sealing element is connected to a housing part or two housing parts or is formed in one piece with the latter.
- According to the invention, it is expedient if the expansion element and/or the sealing element is connected to the housing by welding, soldering, by means of clamping elements or by means of adhesive bonding.
- If, in the case of such an exhaust gas heat exchanger, differential expansion occurs between the exhaust gas tubes and the housing shell, then, on account of the slots running transversely with respect to the longitudinal direction of the tubes, the housing is capable of expanding in the same way as the tubes. This takes place as a result of elastic deformation of the housing shell in the region of the slots, more precisely between two axially offset slots. In order that the coolant which washes around the tubes does not emerge into the open from the slots in the housing, a metal bellows is arranged on the housing over the region of the slots, ensuring the necessary sealing and at the same time being able to follow the expansions of the housing. On account of these measures, thermal stresses and component damage or destruction caused by them are avoided, even in the case of long heat exchanger lengths.
- An exemplary embodiment of the invention is illustrated in the drawing and will be described in more detail in the following text. In the drawing:
-
FIG. 1 shows a perspective view of part of an exhaust gas heat exchanger, -
FIG. 2 shows a plan view of part of an exhaust gas heat exchanger, -
FIG. 3 shows a side view of the part of the exhaust gas heat exchanger according toFIG. 2 and -
FIG. 4 shows a view of part of the exhaust gas heat exchanger with metal bellows, -
FIG. 5 shows an extract of a heat exchanger, -
FIGS. 6 a to 6 c show a view of arrangements of slots and lands, and -
FIG. 7 shows a partial view of a heat exchanger. -
FIG. 1 shows a perspective view of part of a heat exchanger, such as in particular an exhaust gas heat exchanger 1, having ahousing shell 2 which is approximately rectangular in cross section and which, in itsend region 3, is somewhat enlarged in cross section. However, the cross section can also have another geometry, such as round, polygonal, octagonal etc. The end 4 reveals thetube plate 5 with rectangular openings to accommodate fluid channels, such as exhaust gas tubes, which are not illustrated. The ends of these exhaust gas tubes are—as described, for example, in DE-A 199 07 163 already mentioned—welded to the tube plate which, in turn, is welded circumferentially to thehousing shell 3. Provided in thehousing region 3 is anopening 7 for the inlet of coolant, which is distributed in the interior of thehousing region 3 in an annular channel, not illustrated, and from there flows through the heat exchanger on the outer side of the exhaust gas tubes. Finally, approximately in the transition region of thehousing regions slots slot 10 being offset axially with respect to the twoslots -
FIG. 2 shows theseslots housing 2/3 of the heat exchanger 1. Theslots shaped opening slot 9 reaches as far as theouter edge 13, and theslot 10 as far as theouter edge 14. - As can be seen in
FIG. 3 , theslot 9 runs onward in the circumferential direction from theedge 13 as far as thecircular hole 15, and theslot 10 runs onward from theedge 14 as far as thecircular hole 16. Bothslots housing 3 by adashed line 5. The entire exhaust gas heat exchanger 1 is illustrated incompletely inFIGS. 1, 2 and 3, inasmuch as a seal for theslots FIG. 4 . -
FIG. 4 shows a view of part of the heat exchanger with the twohousing regions housing 2/3 and tightly connected to the latter via itscircumferential edges housing regions -
FIG. 5 shows a part of aheat exchanger 100 in which fourslots 110 to 113 are introduced into thewall 101 of the housing, the slots being offset axially and in the circumferential direction in such a way that lands, which act as expanding or bending beams, remain between the slots. - As a result, one part of the heat exchanger can expand in such a way that the housing shell of the heat exchanger is flexible as a result of the bending beam or beams and ensures expansion of the housing.
- As shown in
FIG. 5 , two bending beams are formed by thelands 120 to 123 for each face of the housing, this being the case on all four faces, that is to say even on the faces which cannot be seen in this view. -
FIGS. 6 a to 6 c show variants of designs of slots and lands which are machined into the housing shell in order to form the bending beams. - In
FIG. 6 a, twoslots land 153, which serves as a bending beam. Provided at the ends of the slots are teardrop-shaped cutouts. - In
FIG. 6 b, twoslots lands - The configuration of the slots of
FIG. 6 c corresponds substantially to the configuration ofFIG. 6 b, the slots being angled over in aregion -
FIG. 7 shows a partial view of aheat exchanger 200 with fluid channels through which a first medium can flow. In the exemplary embodiment of an exhaust gas heat exchanger, these are the fluid channels through which the exhaust gas flows. - A second medium can flow between the
fluid channels 201 and possibly around the latter as a further fluid channel, in order to cool the medium in the first fluid channel. This second fluid channel is therefore located within thehousing 202. - For the purpose of improved mechanical decoupling on account of the different thermal expansion of the walls of the
channels 201 and thehousing 202, acircumferential bead 210 is introduced into the housing at at least one point. As a result, the housing, which is generally at a lower temperature than the inner channels during the operation of the heat exchanger, is able to expand when the inner channels expand on account of the thermal expansion, without destruction of the heat exchanger occurring. - The
bead 210 is in this case constituted, for example, by a semicircular bulge. However, it can also have another form, such as in a folded or meandering configuration. The bead can also be bulged inward, that is to say formed as an indentation. During the formation of the bead, it is expedient for the latter to be able to fulfill both expansion characteristics and sealing characteristics.
Claims (19)
1. A heat exchanger comprising:
a tube array, through which a first medium can flow;
a housing, through which a second medium can flow, wherein the housing has a circumference and includes an expansion element; and
at least one tube plate,
wherein ends of the tube array are connected to the at least one tube plate,
wherein the at least one tube plate is connected to the housing, and
wherein the expansion element is formed in one piece with a sealing element.
2. The heat exchanger as claimed in claim 1 , wherein the expansion and sealing element is a circumferential bead.
3. The heat exchanger as claimed in claim 2 , wherein the circumferential bead is formed from one of the following materials: metal, steel, elastomer, and silicone.
4. The heat exchanger as claimed in claim 2 , wherein the circumferential bead is a semicircular bulge, a folded configuration, or a meandering configuration.
5. The heat exchanger as claimed in claim 2 , wherein the circumferential bead is bulged inward into a form of an indentation.
6. The heat exchanger as claimed in claim 1 , wherein the expansion and sealing element is a plurality of circumferential beads.
7. The heat exchanger as claimed in claim 6 , wherein the plurality of circumferential beads is formed from one of the following materials: metal, steel, elastomer, and silicone.
8. The heat exchanger as claimed in claim 6 , wherein each circumferential bead in the plurality of circumferential beads is a semicircular bulge, a folded configuration, a meandering configuration, or bulged inward in the form of an indentation.
9. A heat exchanger comprising:
a tube array, through which a first medium can flow;
a housing, through which a second medium can flow, wherein the housing has a circumference and includes an expansion element; and
at least one tube plate,
wherein ends of the tube array are connected to the at least one tube plate,
wherein the at least one tube plate is connected to the housing, and
wherein the expansion element is formed as at least one circumferential bead.
10. The heat exchanger as claimed in claim 9 , wherein a sealing element is arranged on the housing for covering and sealing the expansion element.
11. The heat exchanger as claimed in claim 10 , wherein the sealing element comprises metal bellows.
12. The heat exchanger as claimed in claim 9 , wherein the at least one circumferential bead is formed from one of the following materials: metal, steel, elastomer, and silicone.
13. The heat exchanger as claimed in claim 9 , wherein the at least one circumferential bead is configured to provide a sealing function.
14. The heat exchanger as claimed in claim 9 , wherein the at least one circumferential bead is a semicircular bulge, a folded configuration, or a meandering configuration.
15. The heat exchanger as claimed in claim 9 , wherein the at least one circumferential bead is bulged inward in a form of an indentation.
16. The heat exchanger as claimed in claim 9 , wherein the at least one circumferential bead comprises a plurality of circumferential beads.
17. The heat exchanger as claimed in claim 16 , wherein the plurality of circumferential beads is formed from one of the following materials: metal, steel, elastomer, and silicone.
18. The heat exchanger as claimed in claim 16 , wherein the plurality of circumferential beads is configured to provide a sealing function.
19. The heat exchanger as claimed in claim 16 , wherein each circumferential bead in the plurality of circumferential beads is a semicircular bulge, a folded configuration, a meandering configuration, or bulged inward in a form of an indentation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/655,136 US20070114007A1 (en) | 2001-10-24 | 2007-01-19 | Heat exchanger |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10152595 | 2001-10-24 | ||
DE10152595.8 | 2001-10-24 | ||
PCT/EP2002/009487 WO2003036214A1 (en) | 2001-10-24 | 2002-08-24 | Thermal conductor |
US10/493,467 US7174948B2 (en) | 2001-10-24 | 2002-08-24 | Heat exchanger |
US11/655,136 US20070114007A1 (en) | 2001-10-24 | 2007-01-19 | Heat exchanger |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/493,467 Division US7174948B2 (en) | 2001-10-24 | 2002-08-24 | Heat exchanger |
PCT/EP2002/009487 Division WO2003036214A1 (en) | 2001-10-24 | 2002-08-24 | Thermal conductor |
Publications (1)
Publication Number | Publication Date |
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US20070114007A1 true US20070114007A1 (en) | 2007-05-24 |
Family
ID=7703635
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/493,467 Expired - Lifetime US7174948B2 (en) | 2001-10-24 | 2002-08-24 | Heat exchanger |
US11/655,136 Abandoned US20070114007A1 (en) | 2001-10-24 | 2007-01-19 | Heat exchanger |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/493,467 Expired - Lifetime US7174948B2 (en) | 2001-10-24 | 2002-08-24 | Heat exchanger |
Country Status (9)
Country | Link |
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US (2) | US7174948B2 (en) |
EP (1) | EP1444474B1 (en) |
JP (1) | JP4006734B2 (en) |
KR (1) | KR100945335B1 (en) |
CN (1) | CN100363703C (en) |
AT (1) | ATE452323T1 (en) |
DE (2) | DE50214106D1 (en) |
MX (1) | MXPA04003883A (en) |
WO (1) | WO2003036214A1 (en) |
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US20050161206A1 (en) * | 2003-12-19 | 2005-07-28 | Peter Ambros | Heat exchanger with flat tubes |
US20090025916A1 (en) * | 2007-01-23 | 2009-01-29 | Meshenky Steven P | Heat exchanger having convoluted fin end and method of assembling the same |
US20090194266A1 (en) * | 2008-01-29 | 2009-08-06 | Conrad Joachim | Straight tube heat exchanger with expansion joint |
US20090250201A1 (en) * | 2008-04-02 | 2009-10-08 | Grippe Frank M | Heat exchanger having a contoured insert and method of assembling the same |
US20100025024A1 (en) * | 2007-01-23 | 2010-02-04 | Meshenky Steven P | Heat exchanger and method |
WO2017019601A1 (en) * | 2015-07-24 | 2017-02-02 | Fulton Group N.A., Inc. | Compliant heating system comprising a metallic expansion joint |
US10989441B2 (en) | 2015-07-13 | 2021-04-27 | Fulton Group N.A., Inc. | High efficiency fluid heating system exhaust manifold |
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Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1593537A (en) * | 1924-05-28 | 1926-07-20 | Calorizing Company | Heat exchanger |
US1776292A (en) * | 1926-01-19 | 1930-09-23 | Nat Aniline & Chem Co Inc | Expansion compensator |
US1826521A (en) * | 1930-04-03 | 1931-10-06 | Albin J Nott | Surface condenser |
US2232936A (en) * | 1940-05-02 | 1941-02-25 | Allis Chaimers Mfg Company | Expansion joint |
US2336879A (en) * | 1942-07-10 | 1943-12-14 | Universal Oil Prod Co | Reactor |
US4974569A (en) * | 1989-03-04 | 1990-12-04 | Dr. Ing. H.C.F. Porsche Ag | Cylinder block and crankcase |
US5022581A (en) * | 1989-05-05 | 1991-06-11 | Productech Inc. | Welding parts having different thermal expansions |
US5584340A (en) * | 1995-08-07 | 1996-12-17 | Heatcraft Inc. | Heat exchanger with flexible tube support |
US6129142A (en) * | 1997-12-18 | 2000-10-10 | Alliedsignal Inc. | Radiator thermal expansion joint and method for making the same |
US6260612B1 (en) * | 1999-05-20 | 2001-07-17 | Toyo Radiator Co., Ltd. | “Stacked” type heat exchanger |
US6269870B1 (en) * | 1998-04-24 | 2001-08-07 | Behr Gmbh & Co. | Exhaust heat exchanger |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6102A (en) * | 1849-02-06 | Improvement in coloring bricks | ||
DE1029841B (en) * | 1956-12-15 | 1958-05-14 | Kuehnle Kopp Kausch Ag | Tubular heat exchangers with tubes made of materials with little tensile strength, for example graphite |
GB1585045A (en) * | 1977-06-28 | 1981-02-18 | Westinghouse Electric Corp | Heat exchanger with double walled tubes |
GB2147403B (en) * | 1983-09-28 | 1987-05-07 | Nat Nuclear Corp Ltd | Tube-in-shell heat exchangers |
DE3435093A1 (en) | 1984-09-25 | 1986-04-03 | Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co KG, 7000 Stuttgart | HEAT EXCHANGER WITH A PACK OF TUBES ARRANGED IN A HOUSING |
JPS6393415U (en) | 1986-12-08 | 1988-06-16 | ||
FR2625301A3 (en) | 1987-12-23 | 1989-06-30 | Valeo Chausson Thermique | Plate heat exchanger, particularly for a motor vehicle, and manufacturing process allowing such an exchanger to be obtained |
DE3934232C1 (en) | 1989-10-13 | 1991-04-11 | Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart, De | |
JPH056226U (en) | 1991-07-05 | 1993-01-29 | 三木プーリ株式会社 | Eccentric declination universal shaft coupling |
JPH0590168U (en) * | 1992-04-24 | 1993-12-07 | 三菱重工業株式会社 | Laminated plate heat exchanger |
DE19519633C2 (en) * | 1995-05-30 | 2000-06-21 | Behr Industrietech Gmbh & Co | Intercooler |
DE29612361U1 (en) | 1996-07-19 | 1996-08-29 | Wahler Gmbh & Co Gustav | Cooler for gaseous or liquid media, in particular exhaust gas cooler, for an internal combustion engine |
DE19907163C2 (en) | 1998-04-24 | 2003-08-14 | Behr Gmbh & Co | Heat exchanger, in particular exhaust gas heat exchanger |
JP4213787B2 (en) | 1998-07-13 | 2009-01-21 | 株式会社三五 | Partition plate structure in exhaust parts of internal combustion engine |
CN2379651Y (en) * | 1999-07-21 | 2000-05-24 | 刘焕波 | Telescopic sleeve |
JP3631406B2 (en) * | 1999-12-28 | 2005-03-23 | 株式会社日本触媒 | Multitubular reactor for catalytic gas phase oxidation reactions. |
DE10009179C2 (en) | 2000-02-26 | 2002-07-18 | Xcellsis Gmbh | Plate heat exchanger |
-
2002
- 2002-08-24 MX MXPA04003883A patent/MXPA04003883A/en active IP Right Grant
- 2002-08-24 WO PCT/EP2002/009487 patent/WO2003036214A1/en active Application Filing
- 2002-08-24 DE DE50214106T patent/DE50214106D1/en not_active Expired - Lifetime
- 2002-08-24 AT AT02779275T patent/ATE452323T1/en not_active IP Right Cessation
- 2002-08-24 KR KR1020047006012A patent/KR100945335B1/en active IP Right Grant
- 2002-08-24 EP EP02779275A patent/EP1444474B1/en not_active Expired - Lifetime
- 2002-08-24 US US10/493,467 patent/US7174948B2/en not_active Expired - Lifetime
- 2002-08-24 CN CNB028259548A patent/CN100363703C/en not_active Expired - Fee Related
- 2002-08-24 DE DE10238882A patent/DE10238882A1/en not_active Withdrawn
- 2002-08-24 JP JP2003538670A patent/JP4006734B2/en not_active Expired - Fee Related
-
2007
- 2007-01-19 US US11/655,136 patent/US20070114007A1/en not_active Abandoned
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1593537A (en) * | 1924-05-28 | 1926-07-20 | Calorizing Company | Heat exchanger |
US1776292A (en) * | 1926-01-19 | 1930-09-23 | Nat Aniline & Chem Co Inc | Expansion compensator |
US1826521A (en) * | 1930-04-03 | 1931-10-06 | Albin J Nott | Surface condenser |
US2232936A (en) * | 1940-05-02 | 1941-02-25 | Allis Chaimers Mfg Company | Expansion joint |
US2336879A (en) * | 1942-07-10 | 1943-12-14 | Universal Oil Prod Co | Reactor |
US4974569A (en) * | 1989-03-04 | 1990-12-04 | Dr. Ing. H.C.F. Porsche Ag | Cylinder block and crankcase |
US5022581A (en) * | 1989-05-05 | 1991-06-11 | Productech Inc. | Welding parts having different thermal expansions |
US5584340A (en) * | 1995-08-07 | 1996-12-17 | Heatcraft Inc. | Heat exchanger with flexible tube support |
US6129142A (en) * | 1997-12-18 | 2000-10-10 | Alliedsignal Inc. | Radiator thermal expansion joint and method for making the same |
US6269870B1 (en) * | 1998-04-24 | 2001-08-07 | Behr Gmbh & Co. | Exhaust heat exchanger |
US6260612B1 (en) * | 1999-05-20 | 2001-07-17 | Toyo Radiator Co., Ltd. | “Stacked” type heat exchanger |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050161206A1 (en) * | 2003-12-19 | 2005-07-28 | Peter Ambros | Heat exchanger with flat tubes |
US8261816B2 (en) | 2003-12-19 | 2012-09-11 | Modine Manufacturing Company | Heat exchanger with flat tubes |
US20090025916A1 (en) * | 2007-01-23 | 2009-01-29 | Meshenky Steven P | Heat exchanger having convoluted fin end and method of assembling the same |
US20100025024A1 (en) * | 2007-01-23 | 2010-02-04 | Meshenky Steven P | Heat exchanger and method |
US8424592B2 (en) | 2007-01-23 | 2013-04-23 | Modine Manufacturing Company | Heat exchanger having convoluted fin end and method of assembling the same |
US9395121B2 (en) | 2007-01-23 | 2016-07-19 | Modine Manufacturing Company | Heat exchanger having convoluted fin end and method of assembling the same |
US20090194266A1 (en) * | 2008-01-29 | 2009-08-06 | Conrad Joachim | Straight tube heat exchanger with expansion joint |
US20090250201A1 (en) * | 2008-04-02 | 2009-10-08 | Grippe Frank M | Heat exchanger having a contoured insert and method of assembling the same |
US8516699B2 (en) | 2008-04-02 | 2013-08-27 | Modine Manufacturing Company | Method of manufacturing a heat exchanger having a contoured insert |
US10989441B2 (en) | 2015-07-13 | 2021-04-27 | Fulton Group N.A., Inc. | High efficiency fluid heating system exhaust manifold |
WO2017019601A1 (en) * | 2015-07-24 | 2017-02-02 | Fulton Group N.A., Inc. | Compliant heating system comprising a metallic expansion joint |
GB2557109A (en) * | 2015-07-24 | 2018-06-13 | Fulton Group N A Inc | Compliant heating system comprising a metallic expansion joint |
Also Published As
Publication number | Publication date |
---|---|
JP2005506510A (en) | 2005-03-03 |
US7174948B2 (en) | 2007-02-13 |
EP1444474B1 (en) | 2009-12-16 |
WO2003036214A1 (en) | 2003-05-01 |
MXPA04003883A (en) | 2005-02-17 |
KR20040052251A (en) | 2004-06-22 |
DE10238882A1 (en) | 2003-05-08 |
CN100363703C (en) | 2008-01-23 |
CN1608194A (en) | 2005-04-20 |
ATE452323T1 (en) | 2010-01-15 |
KR100945335B1 (en) | 2010-03-08 |
JP4006734B2 (en) | 2007-11-14 |
US20050034843A1 (en) | 2005-02-17 |
DE50214106D1 (en) | 2010-01-28 |
EP1444474A1 (en) | 2004-08-11 |
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