EP0217121A1 - Refrigerating apparatus having a heat exchanger adhesively secured to the wall of the refrigerating compartment - Google Patents

Refrigerating apparatus having a heat exchanger adhesively secured to the wall of the refrigerating compartment Download PDF

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Publication number
EP0217121A1
EP0217121A1 EP86111743A EP86111743A EP0217121A1 EP 0217121 A1 EP0217121 A1 EP 0217121A1 EP 86111743 A EP86111743 A EP 86111743A EP 86111743 A EP86111743 A EP 86111743A EP 0217121 A1 EP0217121 A1 EP 0217121A1
Authority
EP
European Patent Office
Prior art keywords
wall
heat exchanger
refrigerating
panel
refrigerating compartment
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.)
Granted
Application number
EP86111743A
Other languages
German (de)
French (fr)
Other versions
EP0217121B1 (en
Inventor
Paolo Marega
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.)
Industrie Zanussi SpA
Original Assignee
Industrie Zanussi SpA
Zanussi Elettrodomestici 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 Industrie Zanussi SpA, Zanussi Elettrodomestici SpA filed Critical Industrie Zanussi SpA
Priority to AT86111743T priority Critical patent/ATE39567T1/en
Publication of EP0217121A1 publication Critical patent/EP0217121A1/en
Application granted granted Critical
Publication of EP0217121B1 publication Critical patent/EP0217121B1/en
Expired 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
    • F25B39/022—Evaporators with plate-like or laminated elements
    • F25B39/024—Evaporators with plate-like or laminated elements with elements constructed in the shape of a hollow panel
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features
    • F25D23/06—Walls
    • 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

Definitions

  • the present invention relates to a refrigerating apparatus, particularly of the domestic type, comprising an evaporator acting as a heat exchanger made of metal and adhesively secured to the outer surface of a wall of a refrigerating compartment formed of a plastic material.
  • the rear wall of the refrigerating compartment and the surface of the evaporator participating in the thermal transition process are of planar configuration and connected in close contact with each other by means of a double-faced adhesive sheet or film interposed therebetween.
  • the plastic material of which the refrigerating compartment is made (usually polystyrene) has a thermal expansion coefficient which is about three times that of the material of the evaporator (usually aluminum). Variations of temperature (for instance during transport of the apparatus, on starting operation of the apparatus for the first time, or during normal operation thereof) thus result in different expansion of the two components, which has to be accommodated by the double-faced adhesive film.
  • the latter is selected to have an infinitesimally small thickness (about ten hundredth of a millimeter) so as not to interfere with the thermal exchange process, and also for economical reasons, in that a double-faced adhesive film of greater thickness, and thus more expensive, although ensuring a reliable mechanical connection, would excessively interfere with the thermal exchange process.
  • this object is attained in a refrigerating apparatus, particularly of the domestic type, comprising a refrigerating compartment having walls of a plastic material, and at least one panel-shaped heat exchanger made of metal and mounted in contact with a wall of said refrigerating compartment by means of a double-faced adhesive film interposed therebetween, characterized in that the thermal transition surface between said heat exchanger panel and the adjacent wall of said refrigerating compartment is provided with discontinuities acting as expansion joints.
  • FIG. 1 The figures of the drawing refer to a refrigerating apparatus provided with an evaporator/heat exchanger 5 of the so-called "hidden" type secured to the outer face of a rear wall 6 of a refrigerating compartment 7.
  • Evaporator/heat exchanger 5 is of the "panel" type made by joining two metal sheets, preferably of aluminium, for example by the roll-bond method.
  • the evaporator/heat exchanger may also be formed of a single metal sheet carrying a meandering tubular conduit secured thereto in a suitable manner and acting to convey a refrigerant.
  • Refrigerating compartment 7 is of box-shaped configuration formed preferably of polystyrene by injection molding, vacuum drawing or a similar process.
  • connection between evaporator panel 5 and rear wall 6 is accomplished by the interposition therebetween of a double-faced adhesive film (not shown) of an infinitesimally small thickness and having a surface area at least equal- ling that of evaporator panel 5.
  • the body of evaporator panel 5 is formed with transversely extending incisions 8 passing therethrough.(fig. 1).
  • conduits 11 for the refrigerant are formed to follow a course permitting the formation of a cruciform central incision 8A and of four peripheral incisions 8B.
  • the incisions 8 thus permit evaporator panel 5 to adapt itself to the greatest expansions and contractions to which plastic wall 6 may be subjected without surpassing the limits of the adhesion capacity of the double-faced adhesive film joining the two components.
  • the provision of the incisions 8 in evaporator panel 5 permits the dimensions of the latter to be increased over the limits imposed by the different thermal expansion characteristics of the materials employed and by the adhesion capacity of a double-faced adhesive film of infinitesimally small thickness. Any increase of the dimensions of the surface area of evaporator panel 5 may be accompanied by a corresponding increase of the number of incisions 8 acting as expansion joints, and thus of the number of partial surface areas defined therebetween.
  • evaporator panel 5 may be of conventional construction, that is, not provided with incisions 8, while rear wall 6 of refrigerating compartment 7 is of a modified construction.
  • Raised surface portions 9 may by way of example be of quadrangular shape, but may of course also have any other suitable configuration.
  • these areas 10 act as deformable diaphragms permitting plastic wall 6 to adapt itself to the smaller expansion and contraction of the metal evaporator panel 5.
  • Both of the described solutions permit an optimum bond to be achieved between a wall of a plastics material and a metallic heat exchanger by the interposition therebetween of a double-faced adhesive film of infinitesimally small thickness, with the metallic heat exchanger having a surface area of greater dimensions than formerly admissible in view of the adhesion capacity of a double-faced adhesive film of this type and of the different thermal expansion characteristics of the materials joined thereby. It is obvious that both of the described solutions may be employed in one and the same refrigerating apparatusso as to combine their individual advantages.
  • the object of the invention is thus attained without the employ of complicated and expensive connection systems or materials the processing of which is difficult.

Abstract

A refrigerating apparatus, particularly of the domestic type, comprising a refrigerating compartment (7) having walls of a plastic material, and a panel-shaped metal evaporator (5) secured in contact with a wall (6) of the refrigerating compartment (7) by the interposition therebetween of a double-faced adhesive film
For permitting the evaporator to be constructed without dimensional limits the thermal transition surfaces between the heat exchanger panel (5) and the wall (6) are provided with expansion joints (8A, 88; 10).

Description

  • The present invention relates to a refrigerating apparatus, particularly of the domestic type, comprising an evaporator acting as a heat exchanger made of metal and adhesively secured to the outer surface of a wall of a refrigerating compartment formed of a plastic material.
  • In a refriegrator of this type, the rear wall of the refrigerating compartment and the surface of the evaporator participating in the thermal transition process are of planar configuration and connected in close contact with each other by means of a double-faced adhesive sheet or film interposed therebetween.
  • It is noted that the plastic material of which the refrigerating compartment is made (usually polystyrene) has a thermal expansion coefficient which is about three times that of the material of the evaporator (usually aluminum). Variations of temperature (for instance during transport of the apparatus, on starting operation of the apparatus for the first time, or during normal operation thereof) thus result in different expansion of the two components, which has to be accommodated by the double-faced adhesive film. The latter is selected to have an infinitesimally small thickness (about ten hundredth of a millimeter) so as not to interfere with the thermal exchange process, and also for economical reasons, in that a double-faced adhesive film of greater thickness, and thus more expensive, although ensuring a reliable mechanical connection, would excessively interfere with the thermal exchange process.
  • In the course of laboratory experiments it has been found that the different expansion of an evaporator made of aluminium and a wall made of polystyrene can be accommodated by this type of double-faced adhesive film only with an evaporator the surface dimensions of which do not exceed a certain value, for instance an area of about 30x40 cm.
  • The different expansion characteristics of these two materials have thus formerly limited the construction of evaporators to the dimensions stated above, or even smaller dimensions. In refrigerators requiring the use of evaporators of greater dimensions, the double-faced adhesive film had to be replaced by more complicated and expensive connection systems. In this context it is known from German Patent No. 3,329,614 to accomplish the connection between the wall of the refrigerating compartment and the heat exchanger or evaporator by interposing therebetween a layer of a gel-type viscous thixotropic material. This solution involves the employ of a difficultly treatable material, of suitable sealing means, and in many cases of additional supply containers for compensating possible losses of the connecting substance. This solution thus complicates the construction of the refrigerator while reducing, although not eliminating, the employ of adhesive substances.
  • It is therefore an object of the invention to achieve, soleley by the employ of the described double-faced adhesive film, an optimum interconnection between a cell made of a plastics material and an evaporator made of metal and having a greater surface area than formerly admissible with regard to the adhesive capacity of the double-faced adhesive film.
  • According to the invention, this object is attained in a refrigerating apparatus, particularly of the domestic type, comprising a refrigerating compartment having walls of a plastic material, and at least one panel-shaped heat exchanger made of metal and mounted in contact with a wall of said refrigerating compartment by means of a double-faced adhesive film interposed therebetween, characterized in that the thermal transition surface between said heat exchanger panel and the adjacent wall of said refrigerating compartment is provided with discontinuities acting as expansion joints.
  • The characteristics of the refrigerating apparatus according to the invention will become more clearly evident from the following description, given by way of example with reference to the accompanying drawings, wherein:
    • fig. 1 shows a diagrammatic front view of a metal evaporator mounted in contact with the refrigerating compartment,
    • fig. 2 shows an alternative embodiment of the refrigerating apparatus according to the invention, depicting in particular a portion of the wall of the refrigerat- in compartment from the side not in contact with the evaporator or heat exchanger, and
    • fig. 3 shows a cross-sectional view of a portion of the refrigerating compartment taken along the line III-III in Fig. 2.
  • The figures of the drawing refer to a refrigerating apparatus provided with an evaporator/heat exchanger 5 of the so-called "hidden" type secured to the outer face of a rear wall 6 of a refrigerating compartment 7.
  • Evaporator/heat exchanger 5 is of the "panel" type made by joining two metal sheets, preferably of aluminium, for example by the roll-bond method. The evaporator/heat exchanger may also be formed of a single metal sheet carrying a meandering tubular conduit secured thereto in a suitable manner and acting to convey a refrigerant.
  • Refrigerating compartment 7 is of box-shaped configuration formed preferably of polystyrene by injection molding, vacuum drawing or a similar process.
  • The connection between evaporator panel 5 and rear wall 6 is accomplished by the interposition therebetween of a double-faced adhesive film (not shown) of an infinitesimally small thickness and having a surface area at least equal- ling that of evaporator panel 5.
  • In one embodiment of the refrigerating apparatus according to the invention, the body of evaporator panel 5 is formed with transversely extending incisions 8 passing therethrough.(fig. 1). To this purpose, conduits 11 for the refrigerant are formed to follow a course permitting the formation of a cruciform central incision 8A and of four peripheral incisions 8B.
  • As a result, the expansions and contractions to which evaporator panel 5 is subjected are no longer directly related to the overall dimensions of its entire surface, but only to the dimensions of the partial surface areas defined by incisions 8 and the outer boundaries of evaporator panel 5.
  • The incisions 8 thus permit evaporator panel 5 to adapt itself to the greatest expansions and contractions to which plastic wall 6 may be subjected without surpassing the limits of the adhesion capacity of the double-faced adhesive film joining the two components.
  • It is thus evident that the provision of the incisions 8 in evaporator panel 5 permits the dimensions of the latter to be increased over the limits imposed by the different thermal expansion characteristics of the materials employed and by the adhesion capacity of a double-faced adhesive film of infinitesimally small thickness. Any increase of the dimensions of the surface area of evaporator panel 5 may be accompanied by a corresponding increase of the number of incisions 8 acting as expansion joints, and thus of the number of partial surface areas defined therebetween.
  • Shown in figs. 2 and 3 is an alternative embodiment of the refrigerating apparatus according to the invention. In this case evaporator panel 5 may be of conventional construction, that is, not provided with incisions 8, while rear wall 6 of refrigerating compartment 7 is of a modified construction.
  • In particular, as shown in the cross-sectional view of fig. 3, the area of rear wall 6 coming into contact with evaporator panel 5 is formed with raised surface portions 9 projecting rearwards of rear wall 6 towards evaporator panel 5. Raised surface portions 9 may by way of example be of quadrangular shape, but may of course also have any other suitable configuration.
  • In this second embodiment, the different thermic behaviour of the two bonded elements is compensated by peripheral areas 10 of each raised surface area 9. In effect these areas 10 act as deformable diaphragms permitting plastic wall 6 to adapt itself to the smaller expansion and contraction of the metal evaporator panel 5.
  • Both of the described solutions permit an optimum bond to be achieved between a wall of a plastics material and a metallic heat exchanger by the interposition therebetween of a double-faced adhesive film of infinitesimally small thickness, with the metallic heat exchanger having a surface area of greater dimensions than formerly admissible in view of the adhesion capacity of a double-faced adhesive film of this type and of the different thermal expansion characteristics of the materials joined thereby. It is obvious that both of the described solutions may be employed in one and the same refrigerating apparatusso as to combine their individual advantages.
  • The object of the invention is thus attained without the employ of complicated and expensive connection systems or materials the processing of which is difficult.

Claims (3)

1. A refrigerating apparatus, particularly of the domestic type, comprising a refrigerating compartment having walls of a plastic material, and at least one panel-shaped heat exchanger made of metal and mounted in contact with a wall of said refrigerating compartment by means of a double-faced adhesive film interposed therebetween, characterized in that the thermal transition surface between said heat exchanger panel (5) and the adjacent wall (6) of said refrigerating compartment (7) is provided with discontinuities (8A, 8B; 10) acting as expansion joints.
2. A refrigerating apparatus according to claim 1, characterized in that said discontinuities are formed as incisions (8A, 8B) passing transversely through the body of said heat exchanger panel (5).
3. A refrigerating apparatus according to claim 1, characterized in that said discontinuities are formed as recessed areas (10) in said wall (6) of said refrig- erating compartment (7) at the side facing towards said heat exchanger panel (5) ot positions determining interruptions of the continuity between areas (9) of said wall (6) contacting said heat exchanger panel (5) and between said areas (9) and adjacent surfaces of said wall (6) not in contact with said panel (5).
EP86111743A 1985-09-12 1986-08-25 Refrigerating apparatus having a heat exchanger adhesively secured to the wall of the refrigerating compartment Expired EP0217121B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86111743T ATE39567T1 (en) 1985-09-12 1986-08-25 REFRIGERATION UNIT WITH HEAT EXCHANGER ADHESIVE TO THE REFRIGERATOR WALL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4573785 1985-09-12
IT45737/85A IT1187293B (en) 1985-09-12 1985-09-12 REFRIGERATOR APPLIANCE WITH HEAT EXCHANGER ADHERING TO THE WALL OF THE REFRIGERATION COMPARTMENT

Publications (2)

Publication Number Publication Date
EP0217121A1 true EP0217121A1 (en) 1987-04-08
EP0217121B1 EP0217121B1 (en) 1988-12-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86111743A Expired EP0217121B1 (en) 1985-09-12 1986-08-25 Refrigerating apparatus having a heat exchanger adhesively secured to the wall of the refrigerating compartment

Country Status (4)

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EP (1) EP0217121B1 (en)
AT (1) ATE39567T1 (en)
DE (1) DE3661574D1 (en)
IT (1) IT1187293B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0569720A1 (en) * 1992-05-12 1993-11-18 AEG Hausgeräte GmbH Refrigerating apparatus with evaporator
WO1996035089A1 (en) * 1995-05-05 1996-11-07 Bundy International Limited Refrigerating appliances
EP0797060A2 (en) * 1996-03-20 1997-09-24 Luigi Fieramonte A process for applying a metal sheet to the outer surface of a refrigerating container
FR2898187A1 (en) * 2006-03-03 2007-09-07 Alcan Rhenalu Sa PROCESS FOR MANUFACTURING INTEGRATED CIRCUIT ALUMINUM PANELS FOR THERMAL EXCHANGERS WITH IMPROVED PERFORMANCE / COST RATIO
WO2010029052A2 (en) * 2008-09-09 2010-03-18 Arcelik Anonim Sirketi A refrigerator
CN102135351A (en) * 2011-04-22 2011-07-27 海信容声(广东)冰箱有限公司 Anti-liner cracking refrigerator evaporator
DE102010042068A1 (en) * 2010-10-06 2012-04-12 Behr Gmbh & Co. Kg Heat exchanger
WO2012142769A1 (en) * 2011-04-22 2012-10-26 海信容声(广东)冰箱有限公司 Refrigerator evaporator able to prevent inner liner from cracking

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2936598A (en) * 1957-06-14 1960-05-17 Gen Motors Corp Refrigerating apparatus
US4498713A (en) * 1982-10-25 1985-02-12 Whirlpool Corporation Thermal stress relief in refrigerators
DE3408867A1 (en) * 1984-03-10 1985-09-12 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Heat exchanger, in particular an evaporator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2936598A (en) * 1957-06-14 1960-05-17 Gen Motors Corp Refrigerating apparatus
US4498713A (en) * 1982-10-25 1985-02-12 Whirlpool Corporation Thermal stress relief in refrigerators
DE3408867A1 (en) * 1984-03-10 1985-09-12 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Heat exchanger, in particular an evaporator

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0569720A1 (en) * 1992-05-12 1993-11-18 AEG Hausgeräte GmbH Refrigerating apparatus with evaporator
WO1996035089A1 (en) * 1995-05-05 1996-11-07 Bundy International Limited Refrigerating appliances
EP0797060A2 (en) * 1996-03-20 1997-09-24 Luigi Fieramonte A process for applying a metal sheet to the outer surface of a refrigerating container
EP0797060A3 (en) * 1996-03-20 1998-04-15 Luigi Fieramonte A process for applying a metal sheet to the outer surface of a refrigerating container
FR2898187A1 (en) * 2006-03-03 2007-09-07 Alcan Rhenalu Sa PROCESS FOR MANUFACTURING INTEGRATED CIRCUIT ALUMINUM PANELS FOR THERMAL EXCHANGERS WITH IMPROVED PERFORMANCE / COST RATIO
WO2007101927A1 (en) * 2006-03-03 2007-09-13 Rubanox Chambery Method for producing aluminum panels comprising an integrated circuit for heat exchangers
WO2010029052A2 (en) * 2008-09-09 2010-03-18 Arcelik Anonim Sirketi A refrigerator
WO2010029052A3 (en) * 2008-09-09 2011-03-03 Arcelik Anonim Sirketi A refrigerator
CN102149989A (en) * 2008-09-09 2011-08-10 阿塞里克股份有限公司 A refrigerator
CN102149989B (en) * 2008-09-09 2013-12-25 阿塞里克股份有限公司 Refrigerator
DE102010042068A1 (en) * 2010-10-06 2012-04-12 Behr Gmbh & Co. Kg Heat exchanger
US8826663B2 (en) 2010-10-06 2014-09-09 Behr Gmbh & Co. Kg Heat exchanger
CN102135351A (en) * 2011-04-22 2011-07-27 海信容声(广东)冰箱有限公司 Anti-liner cracking refrigerator evaporator
WO2012142769A1 (en) * 2011-04-22 2012-10-26 海信容声(广东)冰箱有限公司 Refrigerator evaporator able to prevent inner liner from cracking

Also Published As

Publication number Publication date
DE3661574D1 (en) 1989-02-02
EP0217121B1 (en) 1988-12-28
ATE39567T1 (en) 1989-01-15
IT1187293B (en) 1987-12-23
IT8545737A0 (en) 1985-09-12

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