EP0974794B1 - Refrigerator with evaporator positioned within the preservation compartment roof - Google Patents

Refrigerator with evaporator positioned within the preservation compartment roof Download PDF

Info

Publication number
EP0974794B1
EP0974794B1 EP99113311A EP99113311A EP0974794B1 EP 0974794 B1 EP0974794 B1 EP 0974794B1 EP 99113311 A EP99113311 A EP 99113311A EP 99113311 A EP99113311 A EP 99113311A EP 0974794 B1 EP0974794 B1 EP 0974794B1
Authority
EP
European Patent Office
Prior art keywords
refrigerator
evaporator
roof
eutectic
preservation 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.)
Expired - Lifetime
Application number
EP99113311A
Other languages
German (de)
French (fr)
Other versions
EP0974794A3 (en
EP0974794A2 (en
Inventor
Enzo Whirpool Europe s.r.l. Rivis
Giuseppe Whirpool Europe s.r.l. Panighini
Christian Whirpool Europe s.r.l. Bonato
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.)
Whirlpool Corp
Original Assignee
Whirlpool 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 Whirlpool Corp filed Critical Whirlpool Corp
Publication of EP0974794A2 publication Critical patent/EP0974794A2/en
Publication of EP0974794A3 publication Critical patent/EP0974794A3/en
Application granted granted Critical
Publication of EP0974794B1 publication Critical patent/EP0974794B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features
    • F25D23/06—Walls
    • F25D23/061—Walls with conduit means
    • 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
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/006—Self-contained movable devices, e.g. domestic refrigerators with cold storage accumulators

Definitions

  • This invention relates generally to a domestic refrigerator comprising at least one preservation compartment cooled by evaporator means. More particularly, the invention relates to a domestic refrigerator with automatic defrosting.
  • Refrigerators are known in the most varied constructions, all tending to improve their power consumption and hence their efficiency, and to reduce the thermal load of the evaporator. However a margin always exists for possible improvements to known constructions aimed at achieving further benefits.
  • US-A-2589550 discloses a refrigerator with a preservation compartment surrounded by a tank filled with an eutectic brine.
  • GB-A-1216414 discloses a freezer compartment with a cold storer, which consists of a collapsible envelope and contains a fluid having great heat capacity.
  • An object of the invention is to improve refrigerators of the indicated type such as to appreciably lower their power consumption.
  • the reference numeral 1 indicates overall a refrigerator shown without its door and other members such as the compressor and condenser as these are conventional and do not concern the invention.
  • a conventional evaporator 4 extends in contact with the vertical rear wall 2 and possibly with the side walls which bound the preservation compartment 3 of the refrigerator.
  • a further evaporator 5 is provided in correspondence with the roof 6 which upperly bounds the preservation compartment.
  • This further evaporator can be a section of the other evaporator or be an evaporator connected to the preceding by a trottling means such as a conventional capillary 7.
  • the evaporator 5, whether forming a part or section of the evaporator 4 or whether connected to it via the capillary 7, is positioned upstream of the evaporator 4 with reference to the direction of flow of the refrigerant fluid through the evaporators.
  • the evaporator 5 is not in direct contact with the roof of the preservation compartment 3, but is spaced from it in that it rests either directly, or indirectly via a sheet for example of polyethylene or another similar plastic material, on a panel or cushion 9.
  • This latter is preferably divided into communicating or non-communicating compartments and comprises a flexible or substantially rigid eutectic-containing enclosure of plastic material such as polyethylene, or metal such as aluminium, or aluminized plastic, or plastic filled with a heat conducting material.
  • a substantially rigid enclosure In the case of a substantially rigid enclosure, it can be of a shape such as to compensate any deformation due to the changes of state of the eutectic so as not to deform the roof 6, in addition to the provision of expansion volumes for the eutectic within the enclosure.
  • the eutectic is chosen such as to change its state at a temperature of not less than -10°C, preferably 0°C, the layer formed by the eutectic (minus the thickness of the enclosure), ie the quantity of eutectic contained, and the type of eutectic being such that under the refrigerator operating conditions the roof temperature never falls below a value such as to result in formation of condensate or frost on the underside of the roof.
  • a possible electrical resistance element of suitable power for example positioned on that surface of the eutectic facing the compartment 3, can prevent condensate or frost appearing on said surface.
  • the resistance element can be advantageously replaced by a part of the usual capillary tube connecting the usual condenser (not shown) of the refrigeration circuit to said evaporator, and positioned in correspondence with said surfaces of the eutectic.
  • This has the advantage of recovering the energy dispensed by the eutectic in addition to preventing the formation of the condensate or frost.
  • eutectics are KNO 3 /H 2 O and KCl/H 2 O, or simply H 2 O.
  • the evaporator 5 upstream of the evaporator 4 can also be bonded to the eutectic cushion 9 by adhesives instead of resting thereon directly or indirectly.
  • the evaporators and the eutectic cushion are conventionally embedded in a mass of expanded polyurethane material 10. Arrangements are however possible, all falling within the scope of the invention, in which the evaporator 4 (ie that on the rear) and any evaporators or sections present on the side walls of the compartment are visible, ie not embedded and hence actually lying within the preservation compartment 3.
  • the roof evaporator 5 can also be provided in an exposed position, but in this case it will be substantially clad by the eutectic cushion.
  • the concept on which the invention is based consists of appreciably reducing (as much as by 20-30%) the refrigerator power consumption by virtue of the increase in the evaporating surface, the greater efficiency of the refrigeration cycle in that evaporation can take place at a higher temperature because of the greater evaporating surface, and a lower thermal load on the evaporator.
  • the arrangement of the invention is applicable not only to single-compartment refrigerators (such as that shown), but also to multicompartment refrigerators (combination type), including those with two compressors.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)

Description

  • This invention relates generally to a domestic refrigerator comprising at least one preservation compartment cooled by evaporator means. More particularly, the invention relates to a domestic refrigerator with automatic defrosting.
  • Refrigerators are known in the most varied constructions, all tending to improve their power consumption and hence their efficiency, and to reduce the thermal load of the evaporator.
    However a margin always exists for possible improvements to known constructions aimed at achieving further benefits.
  • US-A-2589550 discloses a refrigerator with a preservation compartment surrounded by a tank filled with an eutectic brine. JP 02017374, on which the preamble of the attached claim 1 is drafted, discloses a cold storage chamber having plate type heat ccumulating members into contact with the outer wall surfaces of an inner casing of the storage chamber.
    GB-A-1216414 discloses a freezer compartment with a cold storer, which consists of a collapsible envelope and contains a fluid having great heat capacity.
  • An object of the invention is to improve refrigerators of the indicated type such as to appreciably lower their power consumption.
  • This and further objects which will be apparent from the ensuing detailed description are attained by a refrigerator of the indicated type, the inventive aspects of which are defined in the accompanying claims.
  • The invention will be more apparent from the detailed description of preferred embodiments thereof given hereinafter by way of non-limiting example and illustrated on the accompanying drawings, on which:
    • Figure 1 is a schematic vertical section through a refrigerator according to the invention;
    • Figure 2 is a schematic section through the roof of the refrigerator of Figure 1;
    • Figure 3 is a schematic perspective view of that shown in Figure 2.
  • In the figures, the reference numeral 1 indicates overall a refrigerator shown without its door and other members such as the compressor and condenser as these are conventional and do not concern the invention.
  • A conventional evaporator 4 extends in contact with the vertical rear wall 2 and possibly with the side walls which bound the preservation compartment 3 of the refrigerator.
  • According to the invention a further evaporator 5 is provided in correspondence with the roof 6 which upperly bounds the preservation compartment. This further evaporator can be a section of the other evaporator or be an evaporator connected to the preceding by a trottling means such as a conventional capillary 7.
  • The evaporator 5, whether forming a part or section of the evaporator 4 or whether connected to it via the capillary 7, is positioned upstream of the evaporator 4 with reference to the direction of flow of the refrigerant fluid through the evaporators.
  • According to the invention, the evaporator 5 is not in direct contact with the roof of the preservation compartment 3, but is spaced from it in that it rests either directly, or indirectly via a sheet for example of polyethylene or another similar plastic material, on a panel or cushion 9. This latter is preferably divided into communicating or non-communicating compartments and comprises a flexible or substantially rigid eutectic-containing enclosure of plastic material such as polyethylene, or metal such as aluminium, or aluminized plastic, or plastic filled with a heat conducting material.
  • In the case of a substantially rigid enclosure, it can be of a shape such as to compensate any deformation due to the changes of state of the eutectic so as not to deform the roof 6, in addition to the provision of expansion volumes for the eutectic within the enclosure.
  • The eutectic is chosen such as to change its state at a temperature of not less than -10°C, preferably 0°C, the layer formed by the eutectic (minus the thickness of the enclosure), ie the quantity of eutectic contained, and the type of eutectic being such that under the refrigerator operating conditions the roof temperature never falls below a value such as to result in formation of condensate or frost on the underside of the roof. A possible electrical resistance element of suitable power, for example positioned on that surface of the eutectic facing the compartment 3, can prevent condensate or frost appearing on said surface. Alternatively the resistance element can be advantageously replaced by a part of the usual capillary tube connecting the usual condenser (not shown) of the refrigeration circuit to said evaporator, and positioned in correspondence with said surfaces of the eutectic. This has the advantage of recovering the energy dispensed by the eutectic in addition to preventing the formation of the condensate or frost. Examples of such eutectics are KNO3/H2O and KCl/H2O, or simply H2O.
  • The evaporator 5 upstream of the evaporator 4 can also be bonded to the eutectic cushion 9 by adhesives instead of resting thereon directly or indirectly.
  • In the refrigerator example shown on the drawings, the evaporators and the eutectic cushion are conventionally embedded in a mass of expanded polyurethane material 10. Arrangements are however possible, all falling within the scope of the invention, in which the evaporator 4 (ie that on the rear) and any evaporators or sections present on the side walls of the compartment are visible, ie not embedded and hence actually lying within the preservation compartment 3. The roof evaporator 5 can also be provided in an exposed position, but in this case it will be substantially clad by the eutectic cushion.
  • The concept on which the invention is based consists of appreciably reducing (as much as by 20-30%) the refrigerator power consumption by virtue of the increase in the evaporating surface, the greater efficiency of the refrigeration cycle in that evaporation can take place at a higher temperature because of the greater evaporating surface, and a lower thermal load on the evaporator.
  • The arrangement of the invention is applicable not only to single-compartment refrigerators (such as that shown), but also to multicompartment refrigerators (combination type), including those with two compressors.

Claims (6)

  1. A refrigerator with at least one preservation compartment (3) cooled by evaporator means (4, 5), the evaporator means (4, 5) comprising a part (4) involving at least one of the vertical walls of the preservation compartment (3) and a part (5) positioned in correspondence with the roof (6) of the preservation compartment (3), characterised in that only the evaporator part (5) in correspondence with the roof (6) transmits its cold to the compartment (3) via an eutectic layer (9), and the evaporator part (4) involving the vertical wall or walls being positioned downstream of the other part in the direction of flow of the refrigerant fluid.
  2. A refrigerator as claimed in claim 1, wherein the eutectic is chosen such as to have a solidification temperature of not less than -10°C, preferably 0°C, so that under operating conditions the roof temperature does not fall below a value such as to cause condensate or frost to form on the underside of the roof (6) of the preservation compartment (3).
  3. A refrigerator as claimed in the preceding claims, wherein the eutectic layer (9) is enclosed in an enclosure defining a cushion on which that part (5) of the evaporator means relative to the roof (6) lies either directly or indirectly.
  4. A refrigerator as claimed in claim 3, characterised in that the enclosure is flexible.
  5. A refrigerator as claimed in claim 3, characterised in that the enclosure is rigid.
  6. A refrigerator as claimed in claim 1, wherein the evaporator parts (4, 5) are connected together via a capillary (7).
EP99113311A 1998-07-22 1999-07-09 Refrigerator with evaporator positioned within the preservation compartment roof Expired - Lifetime EP0974794B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI981693 1998-07-22
IT98MI001693A ITMI981693A1 (en) 1998-07-22 1998-07-22 REFRIGERATOR WITH EVAPORATOR PLACED IN THE SKY OF THE STORAGE COMPARTMENT

Publications (3)

Publication Number Publication Date
EP0974794A2 EP0974794A2 (en) 2000-01-26
EP0974794A3 EP0974794A3 (en) 2000-07-12
EP0974794B1 true EP0974794B1 (en) 2006-09-13

Family

ID=11380491

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99113311A Expired - Lifetime EP0974794B1 (en) 1998-07-22 1999-07-09 Refrigerator with evaporator positioned within the preservation compartment roof

Country Status (4)

Country Link
EP (1) EP0974794B1 (en)
DE (1) DE69933174T2 (en)
ES (1) ES2273454T3 (en)
IT (1) ITMI981693A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103175362A (en) * 2011-12-21 2013-06-26 Lg电子株式会社 Refrigerator having auxiliary cooling device
WO2013156839A1 (en) * 2012-04-16 2013-10-24 Lg Electronics Inc. Cooling element for refrigerator
WO2016035958A1 (en) * 2014-09-05 2016-03-10 삼성전자주식회사 Evaporator, refrigeration device using evaporator, and refrigeration device control method

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19948480A1 (en) * 1999-10-08 2001-04-12 Bsh Bosch Siemens Hausgeraete Heat exchangers such as evaporators, condensers or the like
DE10057590B4 (en) * 2000-11-21 2005-10-06 Palux Ag cooling device
DE10126818A1 (en) * 2001-06-01 2002-12-05 Bsh Bosch Siemens Hausgeraete Evaporator for refrigerator has coolant channel fed between two side walls, at least one made of flexurally weak plastic foil material, coolant channel is made from pipeline
DE102004035017A1 (en) * 2004-07-20 2006-02-16 BSH Bosch und Siemens Hausgeräte GmbH Refrigerating appliance with cold storage
ITVA20070010U1 (en) * 2007-02-16 2008-08-17 Whirlpool Co NO-FROST REFRIGERATOR
ITMI20071259A1 (en) 2007-06-22 2008-12-23 High Technology Partecipation REFRIGERATOR FOR FRESH PRODUCTS WITH PASSIVE MEANS OF UNIFORMING TEMPERATURE WITHOUT VENTILATION AND MAINTAINING THERMAL PERFORMANCES AND RELATIVE HUMIDITY EVEN IN THE ABSENCE OF ELECTRICITY.
WO2012062314A1 (en) * 2010-11-08 2012-05-18 A/S Vestfrost Refrigerator with a temperature buffer
ITFI20110018A1 (en) 2011-02-02 2012-08-03 C P S I Srl Consulenze Progettazio Ni E Servizi I REFRIGERATOR APPARATUS.
WO2012123036A1 (en) * 2011-03-14 2012-09-20 BSH Bosch und Siemens Hausgeräte GmbH Refrigeration device having a heat store
US9618254B2 (en) 2011-07-21 2017-04-11 Lg Electronics Inc. Refrigerator
DE102016007155A1 (en) * 2016-06-13 2017-12-14 Liebherr-Hausgeräte Lienz Gmbh Fridge and / or freezer
DE102017101011A1 (en) 2017-01-19 2018-07-19 Hupfer Metallwerke Gmbh & Co. Kg Food dispenser and method for operating a food dispenser
DE102017212423A1 (en) * 2017-07-20 2019-01-24 BSH Hausgeräte GmbH Refrigeration unit with circulating evaporator

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2589550A (en) * 1943-07-14 1952-03-18 Admiral Corp Two temperature refrigerator
DE1601053A1 (en) * 1967-11-14 1970-08-20 Bauknecht Gmbh G Cooling device
JPS623659Y2 (en) * 1981-01-19 1987-01-27
JPH0827117B2 (en) * 1988-03-17 1996-03-21 サンデン株式会社 Cold storage with cool storage material
JPH0217374A (en) * 1988-07-04 1990-01-22 Sanden Corp Cold storage chamber

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103175362A (en) * 2011-12-21 2013-06-26 Lg电子株式会社 Refrigerator having auxiliary cooling device
CN103175362B (en) * 2011-12-21 2015-11-25 Lg电子株式会社 There is the refrigerator of auxiliary cooling equipment
WO2013156839A1 (en) * 2012-04-16 2013-10-24 Lg Electronics Inc. Cooling element for refrigerator
EP2751504A4 (en) * 2012-04-16 2015-06-03 Lg Electronics Inc Cooling element for refrigerator
WO2016035958A1 (en) * 2014-09-05 2016-03-10 삼성전자주식회사 Evaporator, refrigeration device using evaporator, and refrigeration device control method

Also Published As

Publication number Publication date
EP0974794A3 (en) 2000-07-12
ITMI981693A1 (en) 2000-01-22
DE69933174T2 (en) 2007-09-20
DE69933174D1 (en) 2006-10-26
EP0974794A2 (en) 2000-01-26
ES2273454T3 (en) 2007-05-01
ITMI981693A0 (en) 1998-07-22

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