EP2323781A2 - Improved method for manufacturing a bent heat exchanger - Google Patents
Improved method for manufacturing a bent heat exchangerInfo
- Publication number
- EP2323781A2 EP2323781A2 EP09805526A EP09805526A EP2323781A2 EP 2323781 A2 EP2323781 A2 EP 2323781A2 EP 09805526 A EP09805526 A EP 09805526A EP 09805526 A EP09805526 A EP 09805526A EP 2323781 A2 EP2323781 A2 EP 2323781A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- manifold
- mandrel
- bend
- manifolds
- semi
- 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- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
- B21D7/024—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
- B21D11/10—Bending specially adapted to produce specific articles, e.g. leaf springs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
- B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
-
- 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
- F28D1/05383—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits
-
- 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
- F28D2001/0253—Particular components
- F28D2001/026—Cores
- F28D2001/0273—Cores having special shape, e.g. curved, annular
-
- 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
- F28D2001/0253—Particular components
- F28D2001/026—Cores
- F28D2001/028—Cores with empty spaces or with additional elements integrated into the cores
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/4935—Heat exchanger or boiler making
Definitions
- the invention relates to a method and apparatus for bending a brazed aluminum heater exchanger.
- Priority is claimed to provisional application 61/188,440, filed August 8, 2008.
- a typcial apparatus consists of a cylindrical solid mandrel that engages the tube the core face, between the manifolds, and opposed flat clamps engaging the outer core face and/or manifolds, one of which is held stationary and the other of which is swung in to bend the core around the cylindrical mandrel.
- the core is bent into a 90 degree, radiused corner or corners.
- Another issue is the behavior of the tubes and fins at the "corners" where the manifolds are bent. These can buckle and deform, presenting at least an aesthetic objection, if not a dimunition in performance. Fins may also pull away from the tubes in the bend area, decreasing performance. This limits how tight or small a bend radius can be achieved.
- Figure 1 is a front and top view of a heat exchanger having a core window prior to bending.
- Figure 1 is a face on view of a heat exchanger core having a core window prior to bending.
- Figure 2 is a cross section of Figure 1
- Figure 3 shows the cross section of Figure 2 post bending. .
- Figure 4 shows a perspective view of the bending apparatus.
- Figure 5 shows the same perspective apparatus view with the bent heat exchanger in place.
- Figure 6 shows a cross section through Figure 5.
- Figures 7A-D show progressive sequences of the bending process.
- a basic, pre bend core 10 is stacked and brazed as shown.
- Core 10 includes a series of what will ultimately be vertically oriented flat extruded aluminum tubes 12 running between parallel, upper and lower cylindrical aluminum manifolds 14.
- Manifolds 14 need not absolutely have a cylindrical cross section, although that is preferred for pressure resistance.
- Brazed between adjacent tubes 12 are conventional corrugated air fins or centers 16.
- Core 10 is conventional but for a deliberate removal of tubes 12, about eight or nine in number, leaving an open window 18 and an unslotted length of manifolds 14 of approximately 4 inches. This would vary depending on the size of the core. The open area would necessitate some accommodation in a typical core stacker mechanism, such a spacer to fill in the window 18 temporarily. While the provision of the window 18 at the bend area or corner (what will ultimately be a corner) is not new per se, the subject invention provides a novel apparatus and method that takes better advantage of the window 18 to provide a tight, symmetrical and undeformed bend, with minimal stress to adjacent tubes 12.
- the improved bending apparatus used in the method of the subject invention is designed to apply the bending force only to the manifolds 14, and to provide additional, active support of the manifolds 14 in the bend area in particular.
- a central post 20 rotatable about its center axis carries identical upper and lower semi-cylindrical bending mandrels 22, each of which has a semi cylindrical trough 24 bounded by semi cylindrical upper and lower trough edges 26 and 28.
- Trough 24 is semi cylindrical both along its length, and in its cross section, matching in its cross section the profile of manifold 14.
- Mandrel 22 also carries a straight back up clamp 30 which has a straight trough 32 of the same cross section as semicylindrcal trough 24, bounded by straight upper and lower edges 34 and 36.
- the troughs 24 and 32 are sized to fit closely around the manifolds 14, with the upper edges 26 and 34 aligned along the center line (12 o'clock position) of manifold 14, but with the lower edges 28 and 36 just clearing the inner of core 10.
- the lower one of the mandrels 22 is an exact mirror image of the upper one, so it is to be awakestood that the terms "upper edge” and "lower edge” would be reversed, even though the basic shape is the same.
- a semi cylincrical lobe 38 Extending radially inwardly from the semi cylindrical mandrel lower edge 28 is a semi cylincrical lobe 38, which is concentric to upper edge 26, and which subtends enough arc length to substantialy equal the straight length of that portion of the manifold 14 located within the window 18.
- a pair of pressure plate dies 40 located on the opposite side of core 10, one oppossed to each mandrel 22, each has a semi cylidrical, straight trough 42 equal in cross section to mandrel straight trough 32, bounded by upper and lower edges 44 and 46.
- Upper edge 44 also is aligned with the center line of manifold 14, while the lower edge 46 clears the outer face of core 10.
- a straight lobe 48 Extending inwardly form the lower edge 46 is a straight lobe 48, beginning just in from the end of each die 40, which is coplanar to upper edge 44 and which has a straight length substantially equal to the arc length of semi cylindrcal lobe 38.
- a pair of clamp plates 50 each of which has a straight trough 52 of semi cylindrical cross section equal in size to the mandrel back up clamp straight trough 32, is each located opposed to a respective mandrel back up clamp 30.
- post 20 is turned counter clockwise, thereby swinging the mandrels 22 in the same direction, and the clamp plates 50 engaged with the mandrel back up clams 30 are swung in the same direction about the same pivot axis to maintain the tight grip on the manifods 14.
- This serves to pull that portion of the manifolds 14 to the right of the tangency line, that portion encompassed by the windows 18, around and into the mandrel semicylindrical trough 24.
- the plressure plate die 40 is slid staight to the left at a rate sufficient to maintain the straight lobe 48 in rolling, non-sliding contact with the semicylindrical lobes 38, which move into the windows 18 as the manifolds 14 are bent into a matching radius and the straight lobes 48 concurrently move out of the bending windows 18. Therefore, during the entire bending process, that part of the manifolds 14 moving into the bend is continuously supported by the troughs 26 and 42 between the upper trough edges 26 and 44. which maintain rolling contact, and the lower lobe edges 38 and 48, which also maintain rolling contact.
- a continously rolling area of profile support located centered on the dotted line of tangency maintains the profile, supporting both the inner half of the profile in one trough and the outer half of the profile in another trough, throughout the bend. (Upper and lower, as designations, would be reversed for the lower mandrel 22, of course) This serves both to maintain the circular profile of the manifolds as well as to protect the joints of the tubes 12 with the manifolds 14, since all of the bending force is applied to the manfolds 14 only. This allows the radius of the bend to be tightened, as well. [0018] While this invention has been described in terms of the preferred embodiments thereof, it is not intended to be so limited, but rather only to the extent set forth in the claims that follow.
- the basic invention entails supporting the entire profile of that portion of the manifolds located within the open area of the window during the bending process, between a rotatable cylindrical mandrel supporting the inner side of the mandrels, which has the desired radius and inner arc length of the bend to be created, and an opposed straight pressure die supporting the other side of that portion of the manifolds, and which slides along its length at a rate that maintains a continual rolling contact between it and the cylindrical mandrel as the bending force is applied, however it is applied, and until the bend is completed. It is an additional advantage to provide a pair of clamping elements in the lead of the bend area, by incorporating a straight back up clamp on the mandrel and an opposed clamp plate.
- the manifold profile could be a shape other than round, meaning that the various supporting troughs would have a different matching cross sectional shape (square or elliptical), but the rolling contact lobes that provide all round support to the profile would have the same basic structure.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18844008P | 2008-08-08 | 2008-08-08 | |
PCT/US2009/052910 WO2010017336A2 (en) | 2008-08-08 | 2009-08-06 | Improved method for manufacturing a bent heat exchanger |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2323781A2 true EP2323781A2 (en) | 2011-05-25 |
EP2323781A4 EP2323781A4 (en) | 2014-04-09 |
Family
ID=41664190
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09805526.2A Withdrawn EP2323781A4 (en) | 2008-08-08 | 2009-08-06 | Improved method for manufacturing a bent heat exchanger |
Country Status (4)
Country | Link |
---|---|
US (1) | US20110185574A1 (en) |
EP (1) | EP2323781A4 (en) |
CN (1) | CN102215995A (en) |
WO (1) | WO2010017336A2 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102689147B (en) * | 2012-03-19 | 2014-11-05 | 辽宁省机械研究院有限公司 | High-speed straightening dimensioning blanking process and equipment for aluminum flat pipe of automobile air conditioner |
CN103100585A (en) * | 2012-10-19 | 2013-05-15 | 上海大俊凯电器科技有限公司 | Heat exchanger bending processing method |
US10006662B2 (en) | 2013-01-21 | 2018-06-26 | Carrier Corporation | Condensing heat exchanger fins with enhanced airflow |
CN103759553B (en) * | 2014-02-17 | 2016-05-11 | 丹佛斯微通道换热器(嘉兴)有限公司 | Heat-exchanger rig and heat source unit |
US11585609B2 (en) * | 2014-05-06 | 2023-02-21 | Sanhua (Hangzhou) Micro Channel Heat Exchanger Co., Ltd. | Bent heat exchanger |
CN103925745B (en) * | 2014-05-06 | 2016-04-06 | 杭州三花微通道换热器有限公司 | Bendable heat exchanger |
EP3452771B1 (en) * | 2016-05-03 | 2022-08-31 | Carrier Corporation | Heat exchanger arrangement |
CN207113298U (en) * | 2017-07-27 | 2018-03-16 | 杭州三花微通道换热器有限公司 | Heat exchanger and heat-exchanger rig |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4727737A (en) * | 1986-12-31 | 1988-03-01 | Heil-Quaker Home Systems, Inc. | Method and apparatus for bending a heat exchanger coil |
JP2000154992A (en) * | 1998-11-18 | 2000-06-06 | Daikin Ind Ltd | Air heat exchanger |
JP2005090806A (en) * | 2003-09-16 | 2005-04-07 | Matsushita Electric Ind Co Ltd | Heat exchanger |
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US2996100A (en) * | 1957-04-08 | 1961-08-15 | Dravo Corp | Method and apparatus for bending pipe to short radh with minimum thinning of the outer wall thickness at the bend |
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US20110094257A1 (en) * | 2008-03-20 | 2011-04-28 | Carrier Corporation | Micro-channel heat exchanger suitable for bending |
EP2123372B1 (en) * | 2008-05-21 | 2011-05-11 | BLM S.p.A. | Method for bending pipes, rods, profiled sections and similar blanks, and corresponding device |
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-
2009
- 2009-08-06 WO PCT/US2009/052910 patent/WO2010017336A2/en active Application Filing
- 2009-08-06 CN CN2009801308905A patent/CN102215995A/en active Pending
- 2009-08-06 EP EP09805526.2A patent/EP2323781A4/en not_active Withdrawn
- 2009-08-06 US US13/056,155 patent/US20110185574A1/en not_active Abandoned
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---|---|---|---|---|
US4727737A (en) * | 1986-12-31 | 1988-03-01 | Heil-Quaker Home Systems, Inc. | Method and apparatus for bending a heat exchanger coil |
JP2000154992A (en) * | 1998-11-18 | 2000-06-06 | Daikin Ind Ltd | Air heat exchanger |
JP2005090806A (en) * | 2003-09-16 | 2005-04-07 | Matsushita Electric Ind Co Ltd | Heat exchanger |
Non-Patent Citations (1)
Title |
---|
See also references of WO2010017336A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2010017336A3 (en) | 2011-06-23 |
EP2323781A4 (en) | 2014-04-09 |
CN102215995A (en) | 2011-10-12 |
US20110185574A1 (en) | 2011-08-04 |
WO2010017336A2 (en) | 2010-02-11 |
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