GB2090652A - Improvements Relating to Heat Exchangers - Google Patents

Improvements Relating to Heat Exchangers Download PDF

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Publication number
GB2090652A
GB2090652A GB8100014A GB8100014A GB2090652A GB 2090652 A GB2090652 A GB 2090652A GB 8100014 A GB8100014 A GB 8100014A GB 8100014 A GB8100014 A GB 8100014A GB 2090652 A GB2090652 A GB 2090652A
Authority
GB
United Kingdom
Prior art keywords
headers
aluminium alloy
tubes
disposed
header
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.)
Withdrawn
Application number
GB8100014A
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.)
British Aluminum Co Ltd
Original Assignee
British Aluminum Co Ltd
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 British Aluminum Co Ltd filed Critical British Aluminum Co Ltd
Priority to GB8100014A priority Critical patent/GB2090652A/en
Publication of GB2090652A publication Critical patent/GB2090652A/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/16—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes extruded

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

A heat exchanger assembly comprises a pair of seamless aluminium alloy headers 2, 3 disposed in spaced apart parallel relationship and formed (e.g. in walls 7 thereof) with spaced-apart elongate slots arranged to receive opposite ends of flattened tubes 8 of an aluminium alloy the outer surfaces of which are coated with a brazing alloy, end plates 8a, 17 extending between corresponding ends of the headers parallel with the tubes 8 and having their face-to-face surfaces coated with a brazing alloy, and inlet and outlet connections 5 communicating with the headers, the assembly (including e.g. corrugated strips 19) being brazed together in known manner. In particular the headers 2, 3 are impact extruded to provide a header of D-shaped cross-section with a base 4, and a connector 5 which may alternatively be a separate member. Portions of the plate 8a may form header end closures 10. <IMAGE>

Description

SPECIFICATION Improvements Relating to Heat Exchangers This invention relates to heat exchangers and particularly, although not exclusively, to oil coolers for motor vehicles.
It is well known to construct oil coolers by using a plurality of pairs of pressed out plates of aluminium alloy the plates of each pair being placed together and being of such a shape that a passageway extends between them and having such holes at each end that when a plurality of pairs are arranged in a stack the holes form header tubes communicating with the passageways. Top and bottom plates are disposed at each end of the stack with appropiate inlet and outlet connections to the header tubes are corrugated aluminium alloy strips are disposed between each pair of plates. Appropriate, parts of the assembly have surfaces coated with a brazing alloy and the assembled stack is held in a jig and brazed. Numerous other constructions have also been proposed generally involving fabrication of header tubes and sometimes using flattened tubes to form the passageways.
All such constructions are comparatively complicated to assemble using a considerable number of different parts and are therefore expensive to produce. There are also fairly narrow practical limits on the sizes that may conveniently be made and the complexity of their design increases the likelihood of leakage. Even small reductions in production costs are important and it is an object of the present invention to provide an improved heat exchanger that is cheaper to produce, is flexible as to size and shape, and has a reduced number of mating surfaces to be sealed thus reducing the likelihood of leakage.
According to one aspect of the present invention a heat exchanger assembly comprises a pair of seamless aluminium alloy headers disposed in spaced apart parallel relationship and each formed with opposed pairs of spaced apart elongated slots to receive opposite ends of flattened tubes of an aluminium alloy the outer surfaces of which are coated with a brazing alloy, end plates having their inner surfaces coated with a brazing alloy extending between corresponding ends of the headers parallel with the flattened tubes and inlet and outlet connections communicating with the headers, the assembly being brazed together in known manner.
Corrugated aluminium alloy strips may be disposed between the flattened tubes in known manner.
Preferably each header is formed by impact extruding a slug of aluminium alloy. The base of each extrusion may be formed integrally with one of said connections. Separaters, coated with a brazing alloy may be disposed as a push fit within each header between selected ones of the slots to provide a series flow heat exchanger.
The above and other aspects of the present invention will now be described by way of example with reference to the accompanying drawing in which: Fig. 1 is a section on the line I-I of Fig. 2 and Fig. 2 is an underneath plan view of a heat exchanger with parts cut away.
Referring to the drawing a heat exchanger assembly indicated generally at 1, comprises an opposed pair of headers 2 and 3 each formed as a -D- shaped seamless tube. As shown the headers have been impact extruded from a heat treatable aluminium alloy such as 6063, the remainder of the "slug" employed constituting a base 4 integrally formed with a connector 5. Typically the headers may be about 75 mm long with a wall thickness of say 0.75 mm having been impact extruded from a slug 20 mm thick. Corresponding elongated slots 6 are formed in the opposed flat faces 7 of the headers to receive the ends of flattened tubes 8 as a sliding fit. The tubes are seam welded from single side clad brazing alloy such as number 7 which is suitable for vacuum brazing.A top plate 8a of an aluminium alloy having its inner surface coated with a brazing alloy is disposed at one end of the assembly and has dished parts 10 sealing the open ends of the headers 2 and 3. The outer ends 11 and 12 of the top plate 8a are reinforced with plates 13 and 14 and found with fixing apertures 1 6. A bottom plate 1 7 having its inner surface 18 coated with a brazing alloy is disposed av the opposite end of the assembly and has apertures to extend over the connectors 5. Corrugated strips 1 9 of aluminium alloy are disposed between the tubes 8 and respectively between the outermost tubes 8 and the top and bottom plates 8a and 17.
The assembly as described is supported in a suitable jig (not shown) and brazed together for example in a vacuum brazing operation.
It will be understood that separators shown in chain lines 20 could be provided as push fits in the headers to provide a series flow arrangement.
In the arrangement shown the connector 5 in the header 2 would be omitted and an alternative connector (not shown) would be provided for the header 3. With a different number of tubes 8 and by reversing one of the headers 2 and 3 the connectors 5 could be used for such a series flow arrangement.
By using impact extruded headers the bases 4 may readily be of such thickness that instead of providing integrally formed connectors 5 the latter may be screwed into threaded apertures in the bases.
It will also be appreciated that instead of impact extruding the headers the latter may be extruded in the conventional way. In this case, however, their wall thickness would need to be at least 1.5 mm and the number of mating surfaces to be brazed would be increased.
Claims
1. A heat exchanger assembly comprises a pair of seamless aluminium alloy headers disposed in spaced apart parallel relationship and each formed with opposed pairs of spaced apart
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements Relating to Heat Exchangers This invention relates to heat exchangers and particularly, although not exclusively, to oil coolers for motor vehicles. It is well known to construct oil coolers by using a plurality of pairs of pressed out plates of aluminium alloy the plates of each pair being placed together and being of such a shape that a passageway extends between them and having such holes at each end that when a plurality of pairs are arranged in a stack the holes form header tubes communicating with the passageways. Top and bottom plates are disposed at each end of the stack with appropiate inlet and outlet connections to the header tubes are corrugated aluminium alloy strips are disposed between each pair of plates. Appropriate, parts of the assembly have surfaces coated with a brazing alloy and the assembled stack is held in a jig and brazed. Numerous other constructions have also been proposed generally involving fabrication of header tubes and sometimes using flattened tubes to form the passageways. All such constructions are comparatively complicated to assemble using a considerable number of different parts and are therefore expensive to produce. There are also fairly narrow practical limits on the sizes that may conveniently be made and the complexity of their design increases the likelihood of leakage. Even small reductions in production costs are important and it is an object of the present invention to provide an improved heat exchanger that is cheaper to produce, is flexible as to size and shape, and has a reduced number of mating surfaces to be sealed thus reducing the likelihood of leakage. According to one aspect of the present invention a heat exchanger assembly comprises a pair of seamless aluminium alloy headers disposed in spaced apart parallel relationship and each formed with opposed pairs of spaced apart elongated slots to receive opposite ends of flattened tubes of an aluminium alloy the outer surfaces of which are coated with a brazing alloy, end plates having their inner surfaces coated with a brazing alloy extending between corresponding ends of the headers parallel with the flattened tubes and inlet and outlet connections communicating with the headers, the assembly being brazed together in known manner. Corrugated aluminium alloy strips may be disposed between the flattened tubes in known manner. Preferably each header is formed by impact extruding a slug of aluminium alloy. The base of each extrusion may be formed integrally with one of said connections. Separaters, coated with a brazing alloy may be disposed as a push fit within each header between selected ones of the slots to provide a series flow heat exchanger. The above and other aspects of the present invention will now be described by way of example with reference to the accompanying drawing in which: Fig. 1 is a section on the line I-I of Fig. 2 and Fig. 2 is an underneath plan view of a heat exchanger with parts cut away. Referring to the drawing a heat exchanger assembly indicated generally at 1, comprises an opposed pair of headers 2 and 3 each formed as a -D- shaped seamless tube. As shown the headers have been impact extruded from a heat treatable aluminium alloy such as 6063, the remainder of the "slug" employed constituting a base 4 integrally formed with a connector 5. Typically the headers may be about 75 mm long with a wall thickness of say 0.75 mm having been impact extruded from a slug 20 mm thick. Corresponding elongated slots 6 are formed in the opposed flat faces 7 of the headers to receive the ends of flattened tubes 8 as a sliding fit. The tubes are seam welded from single side clad brazing alloy such as number 7 which is suitable for vacuum brazing.A top plate 8a of an aluminium alloy having its inner surface coated with a brazing alloy is disposed at one end of the assembly and has dished parts 10 sealing the open ends of the headers 2 and 3. The outer ends 11 and 12 of the top plate 8a are reinforced with plates 13 and 14 and found with fixing apertures 1 6. A bottom plate 1 7 having its inner surface 18 coated with a brazing alloy is disposed av the opposite end of the assembly and has apertures to extend over the connectors 5. Corrugated strips 1 9 of aluminium alloy are disposed between the tubes 8 and respectively between the outermost tubes 8 and the top and bottom plates 8a and 17. The assembly as described is supported in a suitable jig (not shown) and brazed together for example in a vacuum brazing operation. It will be understood that separators shown in chain lines 20 could be provided as push fits in the headers to provide a series flow arrangement. In the arrangement shown the connector 5 in the header 2 would be omitted and an alternative connector (not shown) would be provided for the header 3. With a different number of tubes 8 and by reversing one of the headers 2 and 3 the connectors 5 could be used for such a series flow arrangement. By using impact extruded headers the bases 4 may readily be of such thickness that instead of providing integrally formed connectors 5 the latter may be screwed into threaded apertures in the bases. It will also be appreciated that instead of impact extruding the headers the latter may be extruded in the conventional way. In this case, however, their wall thickness would need to be at least 1.5 mm and the number of mating surfaces to be brazed would be increased. Claims
1. A heat exchanger assembly comprises a pair of seamless aluminium alloy headers disposed in spaced apart parallel relationship and each formed with opposed pairs of spaced apart elongated siots to receive opposite ends of flattened tubes of an aluminium alloy the outer surfaces of which are coated with a brazing alloy, end plates having their inner surfaces coated with a brazing alloy extending between corresponding ends of the headers parallel with the flattened tubes and inlet and outlet connections communicating with the headers, the assembly being brazed together in known manner.
2. An assembly according to claim 1 in which corrugated aluminium alloy strips are disposed between the flattened tubes in known manner.
3. An assembly according to claim 1 or claim 2 in which each header is formed by impact extruding a slug of aluminium alloy.
4. An assembly according to any one of the preceding claims in which the base of each extrusion is formed integrally with one of said connections.
5. An assembly according to any one of the preceding claims in which separators coated with a brazing alloy are disposed as a push fit within each header between selected ones of the slots to provide a series flow heat exchanger.
GB8100014A 1981-01-02 1981-01-02 Improvements Relating to Heat Exchangers Withdrawn GB2090652A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8100014A GB2090652A (en) 1981-01-02 1981-01-02 Improvements Relating to Heat Exchangers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8100014A GB2090652A (en) 1981-01-02 1981-01-02 Improvements Relating to Heat Exchangers

Publications (1)

Publication Number Publication Date
GB2090652A true GB2090652A (en) 1982-07-14

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4825941A (en) * 1986-07-29 1989-05-02 Showa Aluminum Kabushiki Kaisha Condenser for use in a car cooling system
US5107926A (en) * 1990-04-03 1992-04-28 Thermal Components, Inc. Manifold assembly for a parallel flow heat exchanger
US5125454A (en) * 1991-08-27 1992-06-30 Thermal Components, Inc. Manifold assembly for a parallel flow heat exchanger
US5152339A (en) * 1990-04-03 1992-10-06 Thermal Components, Inc. Manifold assembly for a parallel flow heat exchanger
US5190100A (en) * 1986-07-29 1993-03-02 Showa Aluminum Corporation Condenser for use in a car cooling system
US5246064A (en) * 1986-07-29 1993-09-21 Showa Aluminum Corporation Condenser for use in a car cooling system
US5355941A (en) * 1993-09-17 1994-10-18 Ford Motor Company Sealing apparatus for a heat exchanger manifold
US5363910A (en) * 1991-11-15 1994-11-15 Nippondenso Co., Ltd. Heat exchanger
US5458190A (en) * 1986-07-29 1995-10-17 Showa Aluminum Corporation Condenser
US5482112A (en) * 1986-07-29 1996-01-09 Showa Aluminum Kabushiki Kaisha Condenser
US5622220A (en) * 1993-03-05 1997-04-22 Doowon Climate Control Co., Ltd. Heat exchanger for automobile air conditioning system
USRE35655E (en) * 1986-07-29 1997-11-11 Showa Aluminum Corporation Condenser for use in a car cooling system
USRE35742E (en) * 1986-07-29 1998-03-17 Showa Aluminum Corporation Condenser for use in a car cooling system
US5881456A (en) * 1997-03-20 1999-03-16 Arup Alu-Rohr Und Profil Gmbh Header tubes for heat exchangers and the methods used for their manufacture
US5934366A (en) * 1997-04-23 1999-08-10 Thermal Components Manifold for heat exchanger incorporating baffles, end caps, and brackets
US6145589A (en) * 1997-04-23 2000-11-14 Thermal Components A Division Of Insilco Corporation Manifold for heat exchanger and baffles therefor
US6830100B2 (en) * 2001-11-02 2004-12-14 Thermalex, Inc. Extruded manifold
AT506309B1 (en) * 2008-06-03 2009-08-15 Pustelnik Philipp Dipl Ing PLATE COOLER FOR LIQUIDS

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE35711E (en) * 1986-07-29 1998-01-06 Showa Aluminum Corporation Condenser for use in a car cooling system
US5190100A (en) * 1986-07-29 1993-03-02 Showa Aluminum Corporation Condenser for use in a car cooling system
US5246064A (en) * 1986-07-29 1993-09-21 Showa Aluminum Corporation Condenser for use in a car cooling system
USRE35742E (en) * 1986-07-29 1998-03-17 Showa Aluminum Corporation Condenser for use in a car cooling system
US5458190A (en) * 1986-07-29 1995-10-17 Showa Aluminum Corporation Condenser
US5482112A (en) * 1986-07-29 1996-01-09 Showa Aluminum Kabushiki Kaisha Condenser
US4825941A (en) * 1986-07-29 1989-05-02 Showa Aluminum Kabushiki Kaisha Condenser for use in a car cooling system
USRE35655E (en) * 1986-07-29 1997-11-11 Showa Aluminum Corporation Condenser for use in a car cooling system
US5107926A (en) * 1990-04-03 1992-04-28 Thermal Components, Inc. Manifold assembly for a parallel flow heat exchanger
US5152339A (en) * 1990-04-03 1992-10-06 Thermal Components, Inc. Manifold assembly for a parallel flow heat exchanger
US5125454A (en) * 1991-08-27 1992-06-30 Thermal Components, Inc. Manifold assembly for a parallel flow heat exchanger
US5363910A (en) * 1991-11-15 1994-11-15 Nippondenso Co., Ltd. Heat exchanger
US5622220A (en) * 1993-03-05 1997-04-22 Doowon Climate Control Co., Ltd. Heat exchanger for automobile air conditioning system
US5355941A (en) * 1993-09-17 1994-10-18 Ford Motor Company Sealing apparatus for a heat exchanger manifold
US5881456A (en) * 1997-03-20 1999-03-16 Arup Alu-Rohr Und Profil Gmbh Header tubes for heat exchangers and the methods used for their manufacture
US5934366A (en) * 1997-04-23 1999-08-10 Thermal Components Manifold for heat exchanger incorporating baffles, end caps, and brackets
US6056047A (en) * 1997-04-23 2000-05-02 Thermal Components, A Division Of Insilco Corporation Manifold for heat exchanger and baffles therefor
US6145589A (en) * 1997-04-23 2000-11-14 Thermal Components A Division Of Insilco Corporation Manifold for heat exchanger and baffles therefor
US6830100B2 (en) * 2001-11-02 2004-12-14 Thermalex, Inc. Extruded manifold
AT506309B1 (en) * 2008-06-03 2009-08-15 Pustelnik Philipp Dipl Ing PLATE COOLER FOR LIQUIDS
US9587887B2 (en) 2008-06-03 2017-03-07 Alpver Vermoegens—Und Liegenschaftsverwaltungs GmbH Plate cooler for fluids

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