EP0222176A1 - Echangeur de chaleur, notamment évaporateur et méthode pour la fabrication de celui-ci - Google Patents

Echangeur de chaleur, notamment évaporateur et méthode pour la fabrication de celui-ci Download PDF

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Publication number
EP0222176A1
EP0222176A1 EP86114077A EP86114077A EP0222176A1 EP 0222176 A1 EP0222176 A1 EP 0222176A1 EP 86114077 A EP86114077 A EP 86114077A EP 86114077 A EP86114077 A EP 86114077A EP 0222176 A1 EP0222176 A1 EP 0222176A1
Authority
EP
European Patent Office
Prior art keywords
pipe
plate
brazing
pipes
aluminum
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Withdrawn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
EP86114077A
Other languages
German (de)
English (en)
Inventor
Giuseppe Agabio
Pierluigi Picco
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.)
ARMCO SpA
Original Assignee
ARMCO SpA
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 ARMCO SpA filed Critical ARMCO SpA
Publication of EP0222176A1 publication Critical patent/EP0222176A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • 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
    • F28F1/14—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 longitudinally
    • F28F1/22—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 longitudinally the means having portions engaging further tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/02—Details of evaporators
    • F25B2339/023—Evaporators consisting of one or several sheets on one face of which is fixed a refrigerant carrying coil

Definitions

  • the invention refers to heat exchangers, particularly to the evaporators used in refrigerating circuits, which consist of a plate on which one or more pipes, particularly at least one winding pipe, or the like, are fixed.
  • the adhesion andthen the heat exchange between the pipes and the plate vary along the length of said pipes. These conditions cannot be sensibly improved even by increasing the contact surface between the pipe and the plate, for example, by using pipes having a profile with one plane surface, particularly a semicircular profile, instead of pipes having a circular profile.
  • the invention aims to eliminate the above stated drawbacks and its object is to realize a heat exchanger, particularly an evaporator, of the type as described in the preamble, having a coefficient of heat transmission between the pipe or pipes and the plate which is considerably higher than the coefficient being obtainable with the known constructions, and which at the same time is also substantial­ly constant along the said pipe or pipes.
  • the pipe or pipes consist of aluminum-steel pipes which are brazed or welded to an aluminum or aluminized-steel plate.
  • the invention is based on the recognition that thanks to its steel inner part, an aluminized-steel pipe withstands without being deformed, both the melting temperature of its aluminum covering that brings about the welding or brazing thereof to the aluminum or aluminized-­steel plate, and the pressures that must be applied on the pipe for keeping it adhering to the plate during the welding or brazing operation, while the said plate can bear both the said temperature and the said pressures without any particular difficulty or deformation problem, since it can be suitably supported, so that it may consist either of aluminized steel, or only of aluminum.
  • the welding or brazing according to the invention between the pipe and the plate produces a heat conductive intimate continuous connection between the pipe and the plate, and so a respective heat transmission coefficient that is considerably higher than the coefficient which was up to now obtainable in the known heat exchangers and particularly evaporators of the type as described in the preamble.
  • the brazed heat exchanger or evaporator according to the invention presents a substantial stability both of the heat transmission coefficient and the internal volume along the pipe or pipes, together with a good corrosion strength in a wet atmosphere, a good economy and an easthetic appearance.
  • the welding or brazing of the aluminized-steel pipe or pipes to the aluminum or aluminized-steel plate may be effected with any suitable method and device fit for the purpose, according to the type of material used for the pipe or pipes and for the plate, and according to the heat exchanger or evaporator to be obtained.
  • the pipe or pipes are pressed against the plate into direct contact therewith if welding, or with the interposition of any suitable brazing material if brazing, and the assembly is heated while keeping the said pressure thereon, up to a temperature being apt for producing at least a partial melting of the aluminum covering of the pipe and of an aluminum surface layer of the plate, and/or the melting of the interposed brazing material.
  • the brazing or welding of the aluminized-steel pipe or pipes to the aluminum or aluminized-steel plate is preferably effected with the use of a deoxidizer flux in a controlled atmosphere furnace, or without the use of a deoxidizer flux in a vacuum furnace.
  • a brazing alloy contain­ing not only a metal, preferably aluminum, but also at least one deoxidizer component and at least one component with a flux action.
  • a brazing Al Si Mg alloy, or the like is used.
  • numeral 1 denotes the winding pipe of an evaporator for a refrigerator
  • numeral 2 denotes the plate on which the said pipe 1 is to be fixed.
  • the refrigerating fluid flows through the pipe 1, while the plate 2 acts as surface for a heat exchange with the space or room to be cooled. Therefore, between the pipe 1 and the plate 2 a connection must be obtained that will guarantee the utmost possible coefficient of heat transmission.
  • the pipe 1 consists of an aluminized-steel pipe, that is to say, a pipe with a steel inner part 101 and an aluminum outer covering 201, and this pipe 1 is brazed onto the plate 2, which in the embodiment according to Figures 1 and 2, consists only of aluminum.
  • Any suitable alloy such as, for example, an Al Si Mg alloy, may be used as brazing material.
  • the brazing operation is, for example, carried out in the following manner: the winding pipe 1 is laid on plate 2 with the interposition of a strip of brazing alloy 3, which preferably is an Al Si Mg alloy, or the like, as shown in Figure 1.
  • a strip of brazing alloy 3 which preferably is an Al Si Mg alloy, or the like, as shown in Figure 1.
  • the pipe 1 and the plate 2 are then pressed against each other in a clamping device, as shown in Figures 5 and 6.
  • This device consists of a lower part 4, and the plate 2 is caused to rest on the upper, preferably continuous surface thereof.
  • the pipe 1 is pressed against the plate 2 with the interposition of the strip 3 of brazing alloy by the upper part 5 of the clamping device, which, as shown, may be continuous, or may have slots between the separate lengths of said winding pipe 1.
  • the two parts 4 and 5 of the clamping device are mutually tightened by means of screws 6 which are pivotally connected, for example, to the lower part 4, and are inserted into peripheral notches 105 in the upper part 5, while the nut screws 7 screwed down on the said screws 6, overlap the upper part 5 of the clamping device, as it appears particularly in Figure 5.
  • the assembly consisting of the winding pipe 1 and the plate 2, which in the clamping device 4, 5 are pressed against each other with the interposition of the strip 3 of brazing alloy, is heated in a controlled atmosphere furnace with the use of a deoxidizer flux, up to such a temperature, for example ranging between 250 and 620°C, as to cause the melting of the brazing alloy 3, and possibly also at least a part-melting of the contiguous zones of the aluminum covering 201 of pipe 1, and of a surface layer of the aluminum plate 2, whereby the brazing between the pipe 1 and the plate 2 is brought about, as shown in Figure 2.
  • a deoxidizer flux up to such a temperature, for example ranging between 250 and 620°C
  • the preferred brazing alloy is the Al Si Mg alloy, since the magnesium contained therein acts as deoxidizer, that is to say, it prevents the oxidation of aluminum, while silicon has a flux action, which reduces the melting point of aluminum and its surface tension.
  • the brazing filler material mainly consists of aluminum, and therefore it is like the material of the two surfaces to be brazed.
  • the embodiment according to Figures 3 and 4 differs from the above disclosed embodiment only in that in place of an aluminum plate 2, it is used an aluminized-steel plate 2, that is to say, a plate 2 having a steel core 102 provided with an aluminum covering 202 preferably on both of its faces, or at least on its face turned toward the winding pipe 1. Also in this case, the aluminized-steel pipe 1 is connected by brazing to the aluminized-steel plate 2 by means of a strip 3 of brazing alloy, preferably consisting of an Al Si Mg alloy, in the manner as described by referring to Figures 1, 2 and 5, 6.
  • the winding pipe 1 made from aluminized steel may be connected by welding, i.e., without any filler material, to the plate 2 also made particularly from aluminized steel.
  • the procedure is substantially the same as disclosed above, however without a strip 3 of brazing material being inter­posed between the pipe 1 and the plate 2, the pipe 1 /plate 2 assembly compressed within the clamping device 4, 5, being heated in a controlled atmosphere furnace with the use of flux, up to a temperature close to the melting of aluminum, i.e., of about 650°C.
  • the practical realization of an evaporator according to the invention for a refrigerating circuit may have, merely by way of a non-limiting example, the following values:
  • the aluminized-steel pipe 1 may have one of the most common diameters ranging between 4 and 10 mm, while the thickness of the wall of its steel inner part 101 may be in the order of 0.6 - 0.8 mm, with an aluminum covering 201 of a thickness between 20 and 200 micron.
  • the plate 2 may be of any suitable shape and size, but practically it seldom exceeds a maximum size of 1200 ⁇ 600 mm.
  • the thickness of the steel core 102 of the plate may be in the order of 0.3 - 1.5 mm, with an aluminum covering 202 having a thickness between 10 and 80 micron. Also a plate 2 made only from aluminum, may have a thickness between 0.3 and 1.5 mm.
  • the evaporators made according to the invention may have any suitable configuration and size, and may be used in any type of refrigerators and freezers. More particularly, the aluminum or aluminized-steel plate may be curved or bent in any desired manner, for example, it may be U-bent, after the aluminized-steel pipe having been welded or brazed thereto.

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)
EP86114077A 1985-11-15 1986-10-10 Echangeur de chaleur, notamment évaporateur et méthode pour la fabrication de celui-ci Withdrawn EP0222176A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT12600/85A IT1188061B (it) 1985-11-15 1985-11-15 Scambiatore termico in particolare evaporatore e metodo per la sua fabbricazione
IT1260085 1985-11-15

Publications (1)

Publication Number Publication Date
EP0222176A1 true EP0222176A1 (fr) 1987-05-20

Family

ID=11142063

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86114077A Withdrawn EP0222176A1 (fr) 1985-11-15 1986-10-10 Echangeur de chaleur, notamment évaporateur et méthode pour la fabrication de celui-ci

Country Status (2)

Country Link
EP (1) EP0222176A1 (fr)
IT (1) IT1188061B (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3726075C1 (en) * 1987-08-06 1989-03-02 Thyssen Edelstahlwerke Ag Method of soldering steel parts and of producing catalyst supports, heat exchangers and soot filters
US5422459A (en) * 1992-03-12 1995-06-06 Zibo Electrothermal Appliances Factory Hot plate with shaped double walled electric heating element to promote heat transfer
US5509472A (en) * 1991-11-14 1996-04-23 Kabushiki Kaisha Toshiba Heat-resisting plate having a cooling structure and method of manufacturing it
WO1998035191A1 (fr) * 1997-02-10 1998-08-13 Raco S.P.A Procede de fabrication d'un evaporateur, un tel evaporateur et utilisation associee
WO2002103262A1 (fr) * 2001-06-15 2002-12-27 Ti Group Automotive Systems Limited Element de transfert thermique brase
WO2003085330A1 (fr) * 2002-04-11 2003-10-16 Grillo-Werke Ag Echangeur thermique et module collecteur plat heliothermique et son procede de production
EP1550834A1 (fr) * 2004-01-02 2005-07-06 Constantine Travassaros Panneau Rayonnant
WO2005121662A1 (fr) 2004-06-07 2005-12-22 BSH Bosch und Siemens Hausgeräte GmbH Evaporateur pour appareil frigorifique et procede de production de cet evaporateur
US8261567B2 (en) 2009-06-23 2012-09-11 Hussmann Corporation Heat exchanger coil with wing tube profile for a refrigerated merchandiser
CN102759226A (zh) * 2012-07-03 2012-10-31 广东奥马电器股份有限公司 一种蒸发器
CN106152617A (zh) * 2015-03-27 2016-11-23 河南新科隆电器有限公司 一种钎焊式冰箱用蒸发器及其制造方法
EP2199713B1 (fr) * 2008-12-22 2018-08-29 Eppendorf Ag Centrifugeuse de laboratoire
CN112222760A (zh) * 2019-06-30 2021-01-15 合肥太通制冷科技有限公司 一种钎焊式板管蒸发器生产工艺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2306772A (en) * 1940-03-12 1942-12-29 Mullins Mfg Corp Sheet and tube evaporator
US2386889A (en) * 1940-08-02 1945-10-16 Outboard Marine & Mfg Co Coil assembly
US4146164A (en) * 1977-11-09 1979-03-27 Aluminum Company Of America Production of aluminum brazing sheet
US4146163A (en) * 1977-11-09 1979-03-27 Aluminum Company Of America Production of aluminum brazing sheet

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2306772A (en) * 1940-03-12 1942-12-29 Mullins Mfg Corp Sheet and tube evaporator
US2386889A (en) * 1940-08-02 1945-10-16 Outboard Marine & Mfg Co Coil assembly
US4146164A (en) * 1977-11-09 1979-03-27 Aluminum Company Of America Production of aluminum brazing sheet
US4146163A (en) * 1977-11-09 1979-03-27 Aluminum Company Of America Production of aluminum brazing sheet

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3726075C1 (en) * 1987-08-06 1989-03-02 Thyssen Edelstahlwerke Ag Method of soldering steel parts and of producing catalyst supports, heat exchangers and soot filters
US5509472A (en) * 1991-11-14 1996-04-23 Kabushiki Kaisha Toshiba Heat-resisting plate having a cooling structure and method of manufacturing it
US5422459A (en) * 1992-03-12 1995-06-06 Zibo Electrothermal Appliances Factory Hot plate with shaped double walled electric heating element to promote heat transfer
WO1998035191A1 (fr) * 1997-02-10 1998-08-13 Raco S.P.A Procede de fabrication d'un evaporateur, un tel evaporateur et utilisation associee
WO2002103262A1 (fr) * 2001-06-15 2002-12-27 Ti Group Automotive Systems Limited Element de transfert thermique brase
WO2003085330A1 (fr) * 2002-04-11 2003-10-16 Grillo-Werke Ag Echangeur thermique et module collecteur plat heliothermique et son procede de production
EP1550834A1 (fr) * 2004-01-02 2005-07-06 Constantine Travassaros Panneau Rayonnant
WO2005121662A1 (fr) 2004-06-07 2005-12-22 BSH Bosch und Siemens Hausgeräte GmbH Evaporateur pour appareil frigorifique et procede de production de cet evaporateur
US8701749B2 (en) 2004-06-07 2014-04-22 Bsh Bosch Und Siemens Hausgerate Gmbh Evaporator for a refrigerator and method for the production thereof
EP2199713B1 (fr) * 2008-12-22 2018-08-29 Eppendorf Ag Centrifugeuse de laboratoire
US8261567B2 (en) 2009-06-23 2012-09-11 Hussmann Corporation Heat exchanger coil with wing tube profile for a refrigerated merchandiser
CN102759226A (zh) * 2012-07-03 2012-10-31 广东奥马电器股份有限公司 一种蒸发器
CN106152617A (zh) * 2015-03-27 2016-11-23 河南新科隆电器有限公司 一种钎焊式冰箱用蒸发器及其制造方法
CN112222760A (zh) * 2019-06-30 2021-01-15 合肥太通制冷科技有限公司 一种钎焊式板管蒸发器生产工艺

Also Published As

Publication number Publication date
IT8512600A0 (it) 1985-11-15
IT1188061B (it) 1987-12-30

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