EP0370255A2 - Appareil frigorifique muni d'un évaporateur statique et d'une pluralité de compartiments à températures différentes - Google Patents

Appareil frigorifique muni d'un évaporateur statique et d'une pluralité de compartiments à températures différentes Download PDF

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Publication number
EP0370255A2
EP0370255A2 EP89119745A EP89119745A EP0370255A2 EP 0370255 A2 EP0370255 A2 EP 0370255A2 EP 89119745 A EP89119745 A EP 89119745A EP 89119745 A EP89119745 A EP 89119745A EP 0370255 A2 EP0370255 A2 EP 0370255A2
Authority
EP
European Patent Office
Prior art keywords
compartment
temperature
cubicle
evaporator
refrigerating apparatus
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Withdrawn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
EP89119745A
Other languages
German (de)
English (en)
Other versions
EP0370255A3 (fr
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
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 filed Critical Industrie Zanussi SpA
Publication of EP0370255A2 publication Critical patent/EP0370255A2/fr
Publication of EP0370255A3 publication Critical patent/EP0370255A3/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Withdrawn legal-status Critical Current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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures

Definitions

  • the present invention relates to a refrigerating apparatus equipped with an evaporator of the so-called "static”, i.e. unventilated, type and com­prising a plurality of compartments held at separate, preferably different, temperatures.
  • a refrigerating apparatus of this type is known for example from Italian patent application no. 48657 A/85, filed on Oct. 11, 1985.
  • it comprises a cubicle compartment normally held at approximately +5°C by a static evaporator with several elements, the bottom of which houses on the inside a further compartment geometrically separate from the cubicle but in heat exchange therewith.
  • the back wall and the bottom wall of the further compartment are associated with a deflector adapted to convey a natural flow of descend­ing air which, after being cooled by the evaporator, acts on the further compartment to cool it in a particularly sensitive way in order to keep it normally at a temperature of approximately 0°C.
  • the further compartment can be held at such a temperature only due to the fact that it is not substantially insulated thermally with respect to the cubicle (which can adversely affect the constancy of the tempera­ture), is disposed at the lowest and thus coldest point of the cubicle (which is an undesirable geometrical constraint), and is associated with the deflector which expediently conveys the natural flow of colder air (which represents a constructional complication).
  • a refrigerating apparatus with a static evaporator hav­ing a simple construction and equipped with a plurality of compartments at least one of which can be held at a lower temperature than that of the cubicle and can be disposed in any position with respect to the cubi­cle.
  • Another object of the invention is to provide a refrigerating appara­tus of the cited type which requires a minimal number of components and is equipped with at least one compartment normally held at a substantial­ly constant temperature of approximately 0°C for conserving particular food.
  • the refrigerating apparatus comprises an insulated cabinet 3 equipped with at least two dis­tinct, adjacent compartments 4 and 5 for conserving food at separate temperatures.
  • Compartments 4 and 5 are equipped with separate doors of access 6, 7 and compartment 5 (with its own door 7) is housed within compartment 4, preferably at the top for convenient access.
  • compartment 5 may also be disposed in a lower position within compartment 4, or the two compartments may be completely independent of each other (for ex­ample one above the other or side by side) and in such a case are only accessible independently via respective doors 6, 7.
  • the refrigerating apparatus is also equipped with one evaporator 8 of the so-called "static", i.e. unventilated, type which is connected to a re­frigerant circuit comprising a compressor 9, a condenser 10, a dehydrating filter 11 and a member 12 for laminating the flow of refrigerant.
  • a re­frigerant circuit comprising a compressor 9, a condenser 10, a dehydrating filter 11 and a member 12 for laminating the flow of refrigerant.
  • the apparatus is also provided with a means 13 for thermostatic tem­perature control (or thermostatic switch) that is known as such and housed for example within compartment 4.
  • Means 13 is associated with at least one probe 14 adapted to detect the temperature of evaporator 8.
  • means 13 effects the start and duration of the activated and deactivated phases of compressor 9 so as to hold compartment 4, the cubicle compartment, normally at a mean predetermined temperature for conserving food.
  • only a portion 18 of the heat exchange surface of evaporator 8 communicates directly with cubicle compartment 4; the evaporator is prolonged (upward in the example being described) in such a way that a further portion 19 of its heat exchange surface communicates directly with adjacent compartment 5.
  • the latter preferably has a smaller volume than cubicle 4 and is insu­lated in a particularly accurate way (for example with a thickening of its own walls) so as to be thermally insulated from cubicle compartment 4.
  • evaporator 8 is preferably smaller than sur­face 18, it is readily possible to provide a dimensional relationship be­tween the two aforesaid surfaces and the volumes of compartments 4, 5 in such a way that compartment 5 (due to its own thermal insulation as well) is normally held at a mean lower temperature than cubicle 4.
  • compartment 5 due to its own thermal insulation as well
  • refrigerant circuit 8-12 is controlled by means 13 to hold cubicle 4 at a mean temperature of +5°C
  • the temperature of compartment 5 can be readily held at a value of about 0°C for conserving particular food, such as meat and certain types of fruit.
  • corresponding defrosting phases of static evapora­tor 8 are realized automatically during the deactivated phases of compres­sor 9, the evaporator preferably being disposed vertically in correspond­ence with the back wall of the apparatus.
  • base wall 15 of compartment 5 ex­tends over the entire inside width of the apparatus and rests against evaporator 8 through the intermediary of a sealing lip 16.
  • the latter being of small dimensions, does not substantially alter the good thermal insulation between compartments 4 and 5 and allows the water produced by the defrosting of upper portion 19 of evaporator 8 to drip to a col­lecting tray 17 situated below.
  • Evaporator 8 is preferably of the so-called "hidden" type as described for example in Italian utility model no. 201.063; in this way the back inside wall of the apparatus can be perfectly flat, allowing for an optimal seal of sealing lip 16.
  • sealing lip 16 can be omitted if compartments 4 and 5 are side by side.
  • portion 19 of evaporator 8 communi­cating with colder compartment 5 is facilitated by the fact that said por­tion 19 has a lower mass than portion 18.
  • the latter communicates with warmer compartment 4 and, by conduction, tends to heat evaporator por­tion 19 during the defrosting phases.
  • compressor 9 is preferably controlled by the electric circuit of Fig. 2.
  • Compressor 9 is connected to heads 21, 22 of a power supply source via control means 13, which substantially comprises a thermostatic switch controlled by probe 14 and by a further probe 20.
  • probe 14 which is preferably, but not exclusively, housed within compartment 4, detects the temperature of evaporator 8 and is adapted to close thermo­static switch 13, thereby activating refrigerant circuit 9-12, when the temperature exceeds a predetermined maximum value.
  • Probe 20, is housed within compartment 5 to detect its ambient temper­ature and open thermostatic switch 13, thereby switching off compressor 9 and starting a corresponding defrosting phase of evaporator 8, when the temperature drops below a predetermined value (0°C in the example de­scribed).
  • the entire refrigerating apparatus functions in accordance with the predetermined mean temperature for the inside environment of compartment 5 while the temperature inside cubicle compartment 4 (whose constancy and precision is less important) is automatically regu­lated as a consequence, in accordance with the general dimensioning of the apparatus.
  • the inside surface of compartment 5 is made at least in part of a highly heat-conducting mate­rial, such as aluminum.
  • a highly heat-conducting mate­rial such as aluminum.
  • the inside surface of base wall 15 (which is the colder one in the example described) is covered with an aluminum layer 23 adapted to distribute uniformly in compartment 5 the thermal energy received by natural convection from surface 19 of evapo­rator 8. Furthermore, the temperature lag of the mass of heat-conducting layer 23 subsequently keeps the temperature within compartment 5 con­stant.

Landscapes

  • 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)
EP19890119745 1988-11-22 1989-10-24 Appareil frigorifique muni d'un évaporateur statique et d'une pluralité de compartiments à températures différentes Withdrawn EP0370255A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8845768A IT1225128B (it) 1988-11-22 1988-11-22 Apparecchio refrigerante con evaporatore statico e piu' scomparti a rispettive temperature
IT4576888 1988-11-22

Publications (2)

Publication Number Publication Date
EP0370255A2 true EP0370255A2 (fr) 1990-05-30
EP0370255A3 EP0370255A3 (fr) 1991-08-07

Family

ID=11258130

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890119745 Withdrawn EP0370255A3 (fr) 1988-11-22 1989-10-24 Appareil frigorifique muni d'un évaporateur statique et d'une pluralité de compartiments à températures différentes

Country Status (2)

Country Link
EP (1) EP0370255A3 (fr)
IT (1) IT1225128B (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE802638C (de) * 1948-10-02 1951-02-15 Metzenauer & Jung G M B H Verfahren zur UEberwachung der Temperatur und der Feuchtigkeit
US3263440A (en) * 1964-12-14 1966-08-02 Electrolux Ab Refrigeration
DE2501364C3 (de) * 1975-01-15 1981-09-17 Jurij Ivanovič Šerkašin Kühlschrank
DE3317074C2 (de) * 1983-05-10 1986-07-17 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Kombiniertes Kühl- und Gefriergerät, mit einem gemeinsamen Kälteaggregat

Also Published As

Publication number Publication date
EP0370255A3 (fr) 1991-08-07
IT8845768A0 (it) 1988-11-22
IT1225128B (it) 1990-11-02

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