US3452814A - Bell-end condenser tubes - Google Patents

Bell-end condenser tubes Download PDF

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Publication number
US3452814A
US3452814A US618479A US3452814DA US3452814A US 3452814 A US3452814 A US 3452814A US 618479 A US618479 A US 618479A US 3452814D A US3452814D A US 3452814DA US 3452814 A US3452814 A US 3452814A
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United States
Prior art keywords
bell
tube
heat exchanger
tubes
diameter
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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.)
Expired - Lifetime
Application number
US618479A
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English (en)
Inventor
Leonard A Malewicz
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.)
General Electric Co
Original Assignee
General Electric Co
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Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of US3452814A publication Critical patent/US3452814A/en
Anticipated expiration legal-status Critical
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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
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling

Definitions

  • a bell-end heat exchanger tube fabricated from a straight cylindrical tube portion and a bell-end stamping.
  • the bell-end stamping has a transition surface extending between a major diameter and a minor diameter thereof, a tangent to said surface lying in a plane substantially perpendicular to the axis of said bell-end stamping. The small end of the bell-end stamping overlaps the straight cylindrical tube portion.
  • the present invention relates to heat exchanger tubes. More particularly, the invention relates to heat exchanger tubes having bell-end portions of greater diameter than their finned tube members.
  • heat exchanger tubes In heat exchangers known to the prior art, it is common to have the heat exchanger tubes extending within the heat exchanger body from one tube sheet to another. It is desirable to have tubes removable from the tube sheet for servicing and replacement. If the tubes are of the type having a fin member extending radially therefrom, the hole in the tube sheet through which the tube is to be removed must necessarily be larger than the tube and fin diameter. For this purpose, heat exchanger tubes are often made with bell ends which have a diameter slightly larger than that of the tube fin. These bell ends are pressed into a tube sheet having similarly enlarged holes so that the finned tube member is removable from the heat exchanger.
  • Another object of the present invention is to provide a relatively economical method of producing bell-end heat exchanger tubes.
  • the present invention is practiced in one form by a heat exchanger tube having a bell end to which it is joined as by welding or other means.
  • the initial separation of the tube and the bell end permits the bell end pieces to be economically produced as by stamping.
  • the stamped bell end members have a short transition from their major to their minor diameter so that the finished heat exchanger tube has an improved proportion of working length to total length.
  • FIG. 1 is a longitudinal section of a bell-end heat exchanger tube according to the prior art
  • FIG. 2 is a longitudinal section of a bell-end heat exchanger tube according to the present invention.
  • FIG. 1 a typical bell-end heat exchanger tube of the prior art is shown.
  • the tube is generally indicated at 2 and has an expanded or bell-end portion 4 having a major diameter and a working length 6 having a smaller minor diameter.
  • the bell-end portion 4 of the tube is tightly fit within a hole 8 through a supporting tube sheet 10.
  • the working length 6 of the heat exchanger tube 2 is that portion of minor diameter and is surrounded by radial heat exchanger fins 12.
  • Bell-end portion 4 and working length 6 of the tube 2 are a single piece. That is, the bell-end 4 was formed by a process of deep drawing or expanding from a tube which was initially of a uniform minor diameter along its length. This deep drawing method of producing a bell-end tube necessitates the gradual transition from the minor to the major diameter as shown in the FIG. 1 tube. The axial length of the transition in tube 2 is effectively lost as a heat exchanger surface since the heat exchanger fins 12 are only added to the tube at its portion of uniform minor diameter, that is, along Working length 6.
  • a heat exchanger tube is generally indicated at 22 and comprises a bell-end portion 24 and a working length of minor diameter 26.
  • Bellend member 24 is fit within hole 28 through tube sheet 30.
  • the working length 26 of the heat exchanger tube 22 is surrounded by heat exchanger fins 32 having an outside diameter slightly less than diameter of hole 28 to permit removal of tube 22 therethrough.
  • Tube portion 26 is a member separate from bell-end portion 24.
  • Members 24 and 26 are lap-joined as by welding or brazing to form the integral heat exchanger tube 22.
  • bell-end portion 24 is a separate piece enables it to be produced by a stamping process from sheet stock and also permits it to be made with a relatively short transition length from its major to its minor diameter. That is, the bell-end portion 24 being separately made can be stamped out with a very abrupt transition from major to minor diameter.
  • the plane of the transition surface is substantially normal to the tube axis. The effect of this is that, having a shorter transition length, there is more working length in the heat exchanger tube 22. That is, fins 32 surround the working length 26 along a greater proportion of the total tube length. The distance from the tube sheet 30 to the nearest fin 32 is kept to a minimum because the axial length of member 24 is kept to a minimum.
  • the production process or method by which the heat exchanger tube of FIG. 2 is made that is, the stamping of part 24 and joining to part 22, is less expensive than the deep drawing or expanding operation of the prior art.
  • a heat exchanger tube in combination with a tube sheet, said tube having a separate bell-end member of uniform wall thickness substantially the sameas the tube wall thickness and a fin member joined thereto, said bellend member having a greater major diameter than said fin member, said bell-end member having a transition surface extending between the major and minor diameters 4- there'of, at'angentto said surface lying in a plane substantially perpendicular to the axis of said bell-end member, the smaller end of the bell-end member being lapjoined to said tube, the larger end of the bell-end member being disposed in a circular hole defined by said tube sheet for withdrawal of the tube and fins therefrom.
US618479A 1967-02-24 1967-02-24 Bell-end condenser tubes Expired - Lifetime US3452814A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US61847967A 1967-02-24 1967-02-24

Publications (1)

Publication Number Publication Date
US3452814A true US3452814A (en) 1969-07-01

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ID=24477879

Family Applications (1)

Application Number Title Priority Date Filing Date
US618479A Expired - Lifetime US3452814A (en) 1967-02-24 1967-02-24 Bell-end condenser tubes

Country Status (4)

Country Link
US (1) US3452814A (de)
CH (1) CH477664A (de)
DE (1) DE1601198A1 (de)
FR (1) FR1553402A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4726168U (de) * 1971-04-09 1972-11-24
USRE33528E (en) * 1985-02-11 1991-01-29 Microtube-strip heat exchanger
ES2199060A1 (es) * 2002-05-30 2004-02-01 Valeo Termico Sa Intercambiador de calor para gases.
US20090065185A1 (en) * 2006-01-23 2009-03-12 Alstom Technology Ltd. Tube Bundle Heat Exchanger
JP2016168601A (ja) * 2015-03-11 2016-09-23 伸和コントロールズ株式会社 伝熱管の拡管方法
US20170064920A1 (en) * 2013-02-06 2017-03-09 The Curators Of The University Of Missouri Waste heat recovery systems and methods for a livestock barn
US10094626B2 (en) 2015-10-07 2018-10-09 Arvos Ljungstrom Llc Alternating notch configuration for spacing heat transfer sheets
US10175006B2 (en) 2013-11-25 2019-01-08 Arvos Ljungstrom Llc Heat transfer elements for a closed channel rotary regenerative air preheater
US10197337B2 (en) 2009-05-08 2019-02-05 Arvos Ljungstrom Llc Heat transfer sheet for rotary regenerative heat exchanger
US10378829B2 (en) 2012-08-23 2019-08-13 Arvos Ljungstrom Llc Heat transfer assembly for rotary regenerative preheater

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1091433A (en) * 1977-05-12 1980-12-16 Modine Manufacturing Company Welded heat exchanger and method of making

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1856618A (en) * 1930-05-23 1932-05-03 Griscom Russell Co Heat exchanger
US2227680A (en) * 1935-12-18 1941-01-07 Albert J Townsend Finned tubing or the like
US2716428A (en) * 1953-03-03 1955-08-30 Pennella Samuel Leak stopper for condenser tubes
US2816739A (en) * 1954-03-03 1957-12-17 Schutte & Koerting Co Tube and tube sheet assembly
US3150714A (en) * 1955-09-01 1964-09-29 Ind Co Kleinewefers Konst Cast heat exchanger tube assembly

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1856618A (en) * 1930-05-23 1932-05-03 Griscom Russell Co Heat exchanger
US2227680A (en) * 1935-12-18 1941-01-07 Albert J Townsend Finned tubing or the like
US2716428A (en) * 1953-03-03 1955-08-30 Pennella Samuel Leak stopper for condenser tubes
US2816739A (en) * 1954-03-03 1957-12-17 Schutte & Koerting Co Tube and tube sheet assembly
US3150714A (en) * 1955-09-01 1964-09-29 Ind Co Kleinewefers Konst Cast heat exchanger tube assembly

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4726168U (de) * 1971-04-09 1972-11-24
USRE33528E (en) * 1985-02-11 1991-01-29 Microtube-strip heat exchanger
ES2199060A1 (es) * 2002-05-30 2004-02-01 Valeo Termico Sa Intercambiador de calor para gases.
US20090065185A1 (en) * 2006-01-23 2009-03-12 Alstom Technology Ltd. Tube Bundle Heat Exchanger
US10914527B2 (en) 2006-01-23 2021-02-09 Arvos Gmbh Tube bundle heat exchanger
US9534850B2 (en) * 2006-01-23 2017-01-03 Arvos Technology Limited Tube bundle heat exchanger
US10197337B2 (en) 2009-05-08 2019-02-05 Arvos Ljungstrom Llc Heat transfer sheet for rotary regenerative heat exchanger
US10982908B2 (en) 2009-05-08 2021-04-20 Arvos Ljungstrom Llc Heat transfer sheet for rotary regenerative heat exchanger
US10378829B2 (en) 2012-08-23 2019-08-13 Arvos Ljungstrom Llc Heat transfer assembly for rotary regenerative preheater
US11092387B2 (en) 2012-08-23 2021-08-17 Arvos Ljungstrom Llc Heat transfer assembly for rotary regenerative preheater
US20170064920A1 (en) * 2013-02-06 2017-03-09 The Curators Of The University Of Missouri Waste heat recovery systems and methods for a livestock barn
US10537089B2 (en) * 2013-02-06 2020-01-21 The Curators Of The University Of Missouri Waste heat recovery systems and methods for a livestock barn
US10175006B2 (en) 2013-11-25 2019-01-08 Arvos Ljungstrom Llc Heat transfer elements for a closed channel rotary regenerative air preheater
JP2016168601A (ja) * 2015-03-11 2016-09-23 伸和コントロールズ株式会社 伝熱管の拡管方法
US10094626B2 (en) 2015-10-07 2018-10-09 Arvos Ljungstrom Llc Alternating notch configuration for spacing heat transfer sheets

Also Published As

Publication number Publication date
DE1601198A1 (de) 1970-12-10
FR1553402A (de) 1969-01-10
CH477664A (de) 1969-08-31

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