WO2012142071A1 - Heat exchanger - Google Patents

Heat exchanger Download PDF

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Publication number
WO2012142071A1
WO2012142071A1 PCT/US2012/032985 US2012032985W WO2012142071A1 WO 2012142071 A1 WO2012142071 A1 WO 2012142071A1 US 2012032985 W US2012032985 W US 2012032985W WO 2012142071 A1 WO2012142071 A1 WO 2012142071A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubes
tube
return
heat exchanger
return tube
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.)
Ceased
Application number
PCT/US2012/032985
Other languages
French (fr)
Inventor
Eric Konkle
Loren D. Hoffman
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.)
Carrier Corp
Original Assignee
Carrier Corp
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 Carrier Corp filed Critical Carrier Corp
Priority to US14/111,043 priority Critical patent/US20140027101A1/en
Publication of WO2012142071A1 publication Critical patent/WO2012142071A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • 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
    • F28D1/047—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 bent, e.g. in a serpentine or zig-zag
    • F28D1/0477—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 bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/02—Fastening; Joining by using bonding materials; by embedding elements in particular materials
    • F28F2275/025—Fastening; Joining by using bonding materials; by embedding elements in particular materials by using adhesives
    • 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
    • Y10T29/49377—Tube with heat transfer means
    • Y10T29/49378—Finned tube
    • Y10T29/4938—Common fin traverses plurality of tubes

Definitions

  • the subject matter disclosed herein relates to heat exchangers. More specifically, the subject disclosure relates to construction of heat exchanger coils for tube-fin heat exchangers or the like.
  • Tube-fin heat exchangers are typically constructed of a plurality of hairpin tubes which pass through holes in a plurality of fins.
  • the hairpin tubes are typically U-shaped to with the open legs of the hairpin protruding through an end fin, or an end sheet of the heat exchanger.
  • a U-shaped return tube is secured to each open leg of the hairpin to connect the hairpin to adjacent hairpins of the heat exchanger.
  • the hairpin Before securing the return to the hairpin, the hairpin is expanded to create a mechanical joint with the fins, and each end of the hairpin is expanded into a bell shape to receive the return tube.
  • the expansion and belling operations require that the inside of the hairpin is lubricated, and a residue from the lubricant typically remains in the hairpin after these operations.
  • the return is then inserted into the belled open end of the hairpin and the components are joined by an adhesive between an outer surface of the return and an inner surface of the hairpin.
  • the presence, however, of the lubricant residue in the hairpin interferes with the bonding action of the adhesive, resulting in leaks, so the hairpin must first be thoroughly cleaned before this bonding operation, which increases cost of the heat exchanger.
  • the inner surface of the hairpin may include rifling or other surface enhancements to improve performance of the heat exchanger. The presence of these enhancements also interferes with the bonding process by presenting an uneven surface for the return tube to affix to.
  • a heat exchanger includes a plurality of fins and a plurality of tubes extending through the plurality of fins.
  • the heat exchanger includes a plurality of return tubes, each return tube connected to tube ends of desired tubes of the plurality of tubes.
  • At least one return tube of the plurality of end tubes is configured such that an inner surface of the at least one return tube is secured to an outer surface of the tube end.
  • a method of assembling a heat exchanger includes inserting a plurality of tubes through a plurality of fins. Desired tubes of the plurality of tubes are connected via a plurality of return tubes. Each return tube connects one or more of the plurality of tubes by inserting a tube end of a tube of the plurality of tubes into an return tube end of the return tube.
  • FIG. 1 is a cross-sectional view of an embodiment of a heat exchanger
  • FIG. 2 is a cross-sectional view of another embodiment of a heat exchanger.
  • FIG. 1 Shown in FIG. 1 is an embodiment of an improved tube-fin heat exchanger 10.
  • the heat exchanger 10 includes a plurality of fins 12, with a plurality of tubes 14 extending therethrough.
  • the tubes 14 may be hairpin, or u-shaped, tubes as shown in FIG. 1, which extend through the fins 12 twice along their length, or may be straight tubes 14, or otherwise configured to extend through the fins 12 only once along their length.
  • an interior of the tube 14 may include enhancements, for example, grooves 16, to improve heat transfer capability of the tube 14. Though grooves 16 are shown in FIG. 1, it is to be appreciated that other forms of enhancements such as bumps, dimples, etc. are contemplated within the present scope.
  • a return tube 18 is secured over ends 20 of adjacent tubes 14.
  • the return tube 18 connects a first tube 14a and a second tube 14b to allow a flow of, for example, refrigerant 22 from the first tube 14a through the return tube 18 and into the second tube 14b.
  • the return tube 18 is substantially U-shaped.
  • Each return tube end 24 has an opening large enough to be located over the tube end 20.
  • the return tube end 24 is secured to the tube end 20 through the utilization of an adhesive layer 28 between an outer tube surface 30 and an inner return tube surface 32.
  • Securing the return tube 18 to the outer tube surface 30 provides better adhesion between the return tube 18 and the tube 14 since the adhesive layer 28 does not contact any lubricant residue present in an interior 34 of the tube 14 from bending or expansion operations. Improved adhesion between the return tube 18 and the tube 14 reduces leakage from the heat exchanger 10 thereby improving heat exchanger 10 performance.
  • the return tube ends 24 may be expanded, or belled, to increase a size of the opening to allow for placement over the tube end 20. This allows for reduction in cross-sectional size of the remainder of the return tube 18, if so desired.
  • the tubes 14 and return tubes 18 may be formed from any desired material such as aluminum, copper, steel, stainless steel, or alloys of one or more of the foregoing, plastics or composites.
  • the adhesive layer 28 may be of an anaerobic adhesive or, for example, an epoxy adhesive.

Landscapes

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

Abstract

A heat exchanger includes a plurality of fins and a plurality of tubes extending through the plurality of fins. The heat exchanger includes a plurality of return tubes, each return tube connected to tube ends of desired tubes of the plurality of tubes. At least one return tube of the plurality of end tubes is configured such that an inner surface of the at least one return tube is secured to an outer surface of the tube end. A method of assembling a heat exchanger includes inserting a plurality of tubes through a plurality of fins. Desired tubes of the plurality of tubes are connected via a plurality of return tubes. Each return tube connects one or more of the plurality of tubes by inserting a tube end of a tube of the plurality of tubes into a return tube end of the return tube.

Description

HEAT EXCHANGER
BACKGROUND OF THE INVENTION
[0001] The subject matter disclosed herein relates to heat exchangers. More specifically, the subject disclosure relates to construction of heat exchanger coils for tube-fin heat exchangers or the like.
[0002] Tube-fin heat exchangers are typically constructed of a plurality of hairpin tubes which pass through holes in a plurality of fins. The hairpin tubes are typically U-shaped to with the open legs of the hairpin protruding through an end fin, or an end sheet of the heat exchanger. A U-shaped return tube is secured to each open leg of the hairpin to connect the hairpin to adjacent hairpins of the heat exchanger.
[0003] Before securing the return to the hairpin, the hairpin is expanded to create a mechanical joint with the fins, and each end of the hairpin is expanded into a bell shape to receive the return tube. The expansion and belling operations require that the inside of the hairpin is lubricated, and a residue from the lubricant typically remains in the hairpin after these operations. The return is then inserted into the belled open end of the hairpin and the components are joined by an adhesive between an outer surface of the return and an inner surface of the hairpin. The presence, however, of the lubricant residue in the hairpin interferes with the bonding action of the adhesive, resulting in leaks, so the hairpin must first be thoroughly cleaned before this bonding operation, which increases cost of the heat exchanger. Further, the inner surface of the hairpin may include rifling or other surface enhancements to improve performance of the heat exchanger. The presence of these enhancements also interferes with the bonding process by presenting an uneven surface for the return tube to affix to.
BRIEF DESCRIPTION OF THE INVENTION
[0004] According to one aspect of the invention, a heat exchanger includes a plurality of fins and a plurality of tubes extending through the plurality of fins. The heat exchanger includes a plurality of return tubes, each return tube connected to tube ends of desired tubes of the plurality of tubes. At least one return tube of the plurality of end tubes is configured such that an inner surface of the at least one return tube is secured to an outer surface of the tube end.
[0005] According to another aspect of the invention, a method of assembling a heat exchanger includes inserting a plurality of tubes through a plurality of fins. Desired tubes of the plurality of tubes are connected via a plurality of return tubes. Each return tube connects one or more of the plurality of tubes by inserting a tube end of a tube of the plurality of tubes into an return tube end of the return tube.
[0006] These and other advantages and features will become more apparent from the following description taken in conjunction with the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] The subject matter, which is regarded as the invention, is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other features, and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
[0008] FIG. 1 is a cross-sectional view of an embodiment of a heat exchanger; and
[0009] FIG. 2 is a cross-sectional view of another embodiment of a heat exchanger.
[0010] The detailed description explains embodiments of the invention, together with advantages and features, by way of example with reference to the drawings.
DETAILED DESCRIPTION OF THE INVENTION
[0011] Shown in FIG. 1 is an embodiment of an improved tube-fin heat exchanger 10. The heat exchanger 10 includes a plurality of fins 12, with a plurality of tubes 14 extending therethrough. The tubes 14 may be hairpin, or u-shaped, tubes as shown in FIG. 1, which extend through the fins 12 twice along their length, or may be straight tubes 14, or otherwise configured to extend through the fins 12 only once along their length. In some embodiments, an interior of the tube 14 may include enhancements, for example, grooves 16, to improve heat transfer capability of the tube 14. Though grooves 16 are shown in FIG. 1, it is to be appreciated that other forms of enhancements such as bumps, dimples, etc. are contemplated within the present scope. [0012] A return tube 18 is secured over ends 20 of adjacent tubes 14. The return tube 18 connects a first tube 14a and a second tube 14b to allow a flow of, for example, refrigerant 22 from the first tube 14a through the return tube 18 and into the second tube 14b. In some embodiments, the return tube 18 is substantially U-shaped. Each return tube end 24 has an opening large enough to be located over the tube end 20. The return tube end 24 is secured to the tube end 20 through the utilization of an adhesive layer 28 between an outer tube surface 30 and an inner return tube surface 32. Securing the return tube 18 to the outer tube surface 30 provides better adhesion between the return tube 18 and the tube 14 since the adhesive layer 28 does not contact any lubricant residue present in an interior 34 of the tube 14 from bending or expansion operations. Improved adhesion between the return tube 18 and the tube 14 reduces leakage from the heat exchanger 10 thereby improving heat exchanger 10 performance.
[0013] Referring now to FIG. 2, in some embodiments, the return tube ends 24 may be expanded, or belled, to increase a size of the opening to allow for placement over the tube end 20. This allows for reduction in cross-sectional size of the remainder of the return tube 18, if so desired.
[0014] The tubes 14 and return tubes 18 may be formed from any desired material such as aluminum, copper, steel, stainless steel, or alloys of one or more of the foregoing, plastics or composites. Further, the adhesive layer 28 may be of an anaerobic adhesive or, for example, an epoxy adhesive.
[0015] While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the spirit and scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.

Claims

CLAIMS:
1. A heat exchanger comprising: a plurality of fins; a plurality of tubes extending through the plurality of fins; and a plurality of return tubes, each return tube connected to tube ends of desired tubes of the plurality of tubes, at least one return tube of the plurality of end tubes configured such that an inner surface of the at least one return tube is secured to an outer surface of the tube end.
2. The heat exchanger of Claim 1, wherein the at least one return tube is secured to the tube end via an adhesive layer disposed between the inner surface and the tube end.
3. The heat exchanger of Claim 2, wherein the adhesive layer comprises one of an anaerobic adhesive or an epoxy adhesive.
4. The heat exchanger of Claim 1 wherein the at least one return tube has a belled- shape at a return tube end.
5. The heat exchanger of Claim 1, wherein at least one return tube of the plurality of return tubes is substantially U-shaped.
6. The heat exchanger of Claim 1, wherein at least one tube of the plurality of tubes is substantially U-shaped.
7. The heat exchanger of Claim 1, wherein one or more of the plurality of tubes and the plurality of return tubes are formed from one of an aluminum, a copper, a steel, a stainless steel, a plastic or a composite material.
8. A method of assembling a heat exchanger comprising: inserting a plurality of tubes through a plurality of fins; and connecting desired tubes of the plurality of tubes via a plurality of return tubes, each return tube connecting to one or more of the plurality of tubes by inserting a tube end of a tube of the plurality of tubes into an return tube end of the return tube.
9. The method of claim 8, further comprising securing the return tube end to the tube end via an adhesive.
10. The method of Claim 9, wherein the adhesive comprises one of an anaerobic adhesive or an epoxy adhesive.
11. The method of Claim 8, further comprising expanding the return tube end before insertion of the tube end into the return tube end.
12. The method of Claim 8, wherein at least one tube of the plurality of tubes passes through the plurality of fins more than once.
PCT/US2012/032985 2011-04-12 2012-04-11 Heat exchanger Ceased WO2012142071A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/111,043 US20140027101A1 (en) 2011-04-12 2012-04-11 Heat exchanger

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201161474603P 2011-04-12 2011-04-12
US61/474,603 2011-04-12

Publications (1)

Publication Number Publication Date
WO2012142071A1 true WO2012142071A1 (en) 2012-10-18

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PCT/US2012/032985 Ceased WO2012142071A1 (en) 2011-04-12 2012-04-11 Heat exchanger

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US (1) US20140027101A1 (en)
WO (1) WO2012142071A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160061536A1 (en) * 2014-08-26 2016-03-03 Cerro Flow Products Llc Heat Exchanger and Method of Assembling the Same

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160341483A1 (en) * 2014-07-13 2016-11-24 Guntner U.S. Llc Heat Exchange Device with Variable Tube Material
JP2017223387A (en) * 2016-06-14 2017-12-21 株式会社サムソン Feed water preheater
JP6821057B2 (en) 2017-12-11 2021-01-27 三菱電機株式会社 Finless heat exchanger and refrigeration cycle equipment

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US3750248A (en) * 1968-06-14 1973-08-07 Emhart Corp Method for making evaporator or condenser construction
US5211221A (en) * 1991-11-26 1993-05-18 Mccord Heat Transfer Method and apparatus for joining coolant tubes of a heat exchanger
DE202010015200U1 (en) * 2010-11-06 2011-03-17 Cabero Wärmetauscher Gmbh & Co. Kg heat exchangers

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FR2673275B1 (en) * 1991-02-26 1994-01-07 Valeo Thermique Moteur DEVICE FOR CONNECTING A HEAT EXCHANGER, OF THE COIL TYPE, TO A FLUID CIRCULATION TUBING.
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KR20090022841A (en) * 2007-08-31 2009-03-04 엘지전자 주식회사 Heat exchanger of the refrigerating device, its refrigerant tube and its manufacturing method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1525743A1 (en) * 1966-07-19 1969-03-13 Minnesota Mining & Mfg Method and device for making glued pipe connections
US3750248A (en) * 1968-06-14 1973-08-07 Emhart Corp Method for making evaporator or condenser construction
US5211221A (en) * 1991-11-26 1993-05-18 Mccord Heat Transfer Method and apparatus for joining coolant tubes of a heat exchanger
DE202010015200U1 (en) * 2010-11-06 2011-03-17 Cabero Wärmetauscher Gmbh & Co. Kg heat exchangers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160061536A1 (en) * 2014-08-26 2016-03-03 Cerro Flow Products Llc Heat Exchanger and Method of Assembling the Same

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