EP0343532A2 - Kühlvorrichtung mit mehreren auf jeweiligen Temperaturen gehaltenen Fächern - Google Patents

Kühlvorrichtung mit mehreren auf jeweiligen Temperaturen gehaltenen Fächern Download PDF

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Publication number
EP0343532A2
EP0343532A2 EP89109064A EP89109064A EP0343532A2 EP 0343532 A2 EP0343532 A2 EP 0343532A2 EP 89109064 A EP89109064 A EP 89109064A EP 89109064 A EP89109064 A EP 89109064A EP 0343532 A2 EP0343532 A2 EP 0343532A2
Authority
EP
European Patent Office
Prior art keywords
compartment
compressor
temperature
passage
evaporator
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Withdrawn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
EP89109064A
Other languages
English (en)
French (fr)
Other versions
EP0343532A3 (de
Inventor
Paolo Marega
Guiseppe Maneschi
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 EP0343532A2 publication Critical patent/EP0343532A2/de
Publication of EP0343532A3 publication Critical patent/EP0343532A3/de
Withdrawn legal-status Critical Current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
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/062—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators
    • F25D17/065—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators with compartments at different temperatures
    • 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
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/10—Sensors measuring the temperature of the evaporator

Definitions

  • the present invention relates to a refrigerating appliance having several compartments maintained at respective temperatures, of the type comprising a single-compressor refrigerant circuit controlled by a single thermostatic temperature control unit.
  • the refrigerating appliance comprises one storage compartment maintained at a food storage temperature of about +5 o C, and another compartment maintained at a lower temperature.
  • the appliance includes a single static evaporator disposed in heat-exchange relationship with the storage compartment and with a passage provided separate from the storage compartment and communicating with the lower-temperature compartment.
  • a fan is operable to create a forced air flow in a closed circuit extending along the passage and through the lower-temperature compartment, which is thereby indirectly, but intensely cooled by the evaporator.
  • the latter belongs to a single-compressor refrigerant circuit the energiz­ation and deenergization periods of whose compressor are controlled by a single thermostatic control unit which is responsive to the surface temperature of the evaporator and thus able to also control the evaporator defrosting operation.
  • thermostatic control means are provided for deenergizing the fan substantially for the duration of the defrosting operation to thereby avoid any excessive temperature rise in the lower-temper­ature compartment.
  • This solution is particularly advantageous in that it provides a particularly simple and reliable refrigerating appliance with optimum performance.
  • the ambient temperature within the lower-temperature compartment is substantially determined by the relative dimensions of the various components of the appliance, and is specifically - although only indirectly - a function of the surface temperature of the evaporator, so that it can vary within a relatively wide range, although this may normally be acceptable.
  • a refrigerating appliance having several compartments adapted to be maintained at respective temperatures, comprising a single-compressor refrigerant circuit controlled by a thermostatic control unit operable to cyclically determine operative and inoperative periods of said compressor for normally maintaining at least a first compartment at a food storage temperature.
  • the appliance further includes a static evaporator connected to said circuit and disposed in heat-exchange relationship with said first compartment and a passage substantially separated from said first compartment and communicating with at least one second compartment.
  • Blower means are normally operable to create a forced air flow in a closed circuit extending along said passage and through said second compartment, first control means being provided for deenergizing said blower means substantially for the duration of the inoperative periods of said compressor.
  • a refrigerating appliance of the type defined above is characterized by additionally comprising further control means adapted to sense the ambient temperature within said second compartment and to deenergize said blower means when said ambient temper­ature descends below a predetermined value.
  • This predetermined value is preferably smaller than that of the food storage temperature.
  • the refrigerating appliance has an insulated housing 6 enclosing at least two separate compartments 7 and 8 for the storage of foods at respective temperatures.
  • Each compartment 7, 8 is provided with a separate access door 9 and 10, respectively, compartment 8 with its door 10 being preferably housed within compartment 7.
  • the two compartments 7 and 8 may of course also be com­pletely separated from one another, as by being disposed side by side or one on top of the other, in which case they are independently accessible through their respective doors 9 and 10.
  • an evaporator 11 Associated to compartment 7 in heat-exchange relationship therewith is an evaporator 11 of the so-called "static" type forming part of a refrigerant circuit additionally including a compressor 12, a condenser 13, a demoistening filter 14 and a refrigerant flow laminator element 15.
  • the refrigerating appliance is further provided with a thermostatic temperature control unit 16 or thermostatic switch of a per se known type disposed for instance within compartment 7.
  • control unit 16 Associated to control unit 16 is a sensor 17 for detecting the temperature of evaporator 11; in a per se known manner control unit 16 is operable to determine the operative and inoperative periods of compressor 12 to thereby maintain the interior of com­partment 7 at a preselected mean temperature for the storage of foods, for instance at about +5 o C.
  • Evaporator 11 is automatically defrosted at predetermined intervals during inoperative periods of compressor 12.
  • Evaporator 11 is preferably extended upwards to extend into a passage 18 which in the described example is defined by a rear wall 3 of compartment 8, the rear wall of compartment 7 and respective portions of the lateral walls of compartment 7.
  • passage 18 is substantially separated from compartment 7 proper by a lip seal 4 or the like extending transversely adjacent the bottom of compartment 8.
  • the upper portion of evaporator 11 is thus in heat-­exchanging relationship with passage 18, the latter having at least one inlet 21 and at least one outlet port 22 communicating with compartment 8.
  • a motor-driven fan 23 or the like is preferably disposed within compartment 8, specifically within a flow guide passage 19, and operable to create a forced air flow in a closed circuit.
  • This air flow flows from compartment 8 through guide passage 19 and along passage 18, in heat-exchange relationship with evaporator 11, to subsequently return into compartment 8.
  • the latter is thus indirectly - but nevertheless intensely, thanks to the forced circulation - refrigerated by the same evaporator 11 also used for refrigerating compartment 7.
  • the mean temperature within compartment 7 may be kept at about +5 o C, while the temperature within compartment 8 may be notice­ably below 0 o C when fan 23 is in operation.
  • thermostatic control means 5 including a sensor 20 for detecting the ambient temperature within compartment 8, and operable to deenergize fan 23, which is normally in its operative state, when the temperature drops below a predetermined fixed value.
  • this predetermined value is about 0 o C to -1 o C and thus corresponds to the optimum temperature for the storage of certain foods, such as meat and certain types of fruit.
  • Fan 23 has of course also to be deenergized during the defrosting periods of evaporator 11, to thereby avoid an excessive temperature rise within compartment 8, substantivelyially as described in the Italian Patent Application No. 45703 A/88 cited above.
  • this operating mode of the refrigerating appliance may be achieved by connecting compressor 12 to the terminals 25, 26 of an electric power source through the thermostatic switch 16 controlled by sensor 17. Connected in parallel to compressor 12 is the series-connected circuit formed of the motor 27 operating fan 23, and thermostatic switch 5 controlled by sensor 20.
  • thermostatic switch 16 is closed to energize compressor 12, resulting in the operation of refrigerant circuit 11 to 15 as a whole.
  • thermo­static switch 16 When on the other hand sensor 17 detects a temperature of evaporator 11 lying below a preselected value, thermo­static switch 16 is caused to open to thereby deenergize compressor 12 for a period during which evaporator 11 is being defrosted.
  • the water produced by the defrosting operation flows downwards by the action of gravity and collects in a channel 30 (fig. 1) disposed in the lower part of the appliance, from which it is drained through a drain port 24.
  • the lip seal 4 permits the water produced by defrosting the upper portion of evaporator 11 associated to passage 18 to flow downwards into channel 30; on the other hand, however, and as already explained above, lip seal 4 acts as a thermal insulation separating passage 18 from compartment 7.
  • the cyclical energization and deenergization of compressor 12, as determined by the dimensions of the various components, is controlled to maintain compartment 7 at a mean temperature of about +5 o C.
  • thermostatic switch 16 As long as thermostatic switch 16 is closed, motor 27 of fan 23 is normally also energized through thermostatic switch 5, which remains closed until sensor 20 detects a temperature in compartment 8 which is lower than a predetermined fixed value of 0 o C to -1 o C in the present example.
  • thermostatic control assembly 5, 20 acts to repeatedly energize and deenergize fan 23, to thereby maintain the temperature within compartment 8 at a substantially accurate and constant value, independent of and different from the temperature within compartment 7.
  • Fan 23 is of course always inoperative as long as thermostatic switch 16 is opened for the periodical defrosting of evaporator 11; this prevents an undesirable temperature rise within compartment 8, as already explained, and contributes to maintaining the temperature within compartment 8 substantially constant at the predetermined value defined above.
  • motor 27 may preferably be located outside compartment 8 and connected to fan 23 by a drive transmission shaft sealingly extending through an opening 28 formed in a wall of the compartment. In this manner the heat generated by the operation of motor 27 will not have the least influence on the temperature within com­partment 8.
  • the described refrigerating appliance may of course be modified in any manner within the scope of the invention. It may for instance additionally include one or several freezer compartments, and the predetermined temperature within compartment 8 may be different from the value defined above by way of example. By varying the dimensions of the various components, these values may be selected to be equal to or greater than those of the ambient temperature within compartment 7.
  • thermostatic switches 5 and 16 may be adjustable for permitting the user to vary the fixed value of the temperature within compartment 8 and/or of the mean temperature within compartment 7.
  • Passage 18 may also be designed in a different manner, and evaporator 11 may be arranged differently, as for instance descibed in the already cited Italian Patent Application No. 45703 A/88.
  • compartments 7 and 8 may likewise arranged in a different manner, for instance above one another or side by side, with the associated access doors 9 and 10, respectively, completely independent of each other.
  • thermostatic control means 5 may be associated to electronic control circuitry (of a per se known type and therefore not shown) for permitting the rotational speed of fan 23 to be varied in proportion to albeit slight variations of the temperature within compartment 8; in any case, of course, fan 23 is deenerg­ized when the temperature within compartment 8 drops below the above defined predetermined value.

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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)
EP89109064A 1988-05-23 1989-05-19 Kühlvorrichtung mit mehreren auf jeweiligen Temperaturen gehaltenen Fächern Withdrawn EP0343532A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4573088 1988-05-23
IT45730/88A IT1220753B (it) 1988-05-23 1988-05-23 Apparecchio refrigerante con piu' scomparti a rispettive temperature

Publications (2)

Publication Number Publication Date
EP0343532A2 true EP0343532A2 (de) 1989-11-29
EP0343532A3 EP0343532A3 (de) 1990-06-20

Family

ID=11257838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89109064A Withdrawn EP0343532A3 (de) 1988-05-23 1989-05-19 Kühlvorrichtung mit mehreren auf jeweiligen Temperaturen gehaltenen Fächern

Country Status (2)

Country Link
EP (1) EP0343532A3 (de)
IT (1) IT1220753B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5966951A (en) * 1997-06-24 1999-10-19 Ab Electrolux Absorption refrigerator with automatic defrosting
WO2002065035A1 (en) 2001-02-15 2002-08-22 Lg Electronics Inc. Auxiliary storage system for refrigerator
DE102011079198A1 (de) 2011-07-14 2013-01-17 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät, insbesondere haushaltskältegerät

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2741098A (en) * 1955-04-25 1956-04-10 Gen Electric Two temperature refrigerator
GB896723A (en) * 1960-02-17 1962-05-16 Gen Motors Corp Forced-air refrigerator
GB1176986A (en) * 1966-04-01 1970-01-07 Giovanni Borghi An Air Circulation Refrigerating Apparatus
SE7903117L (sv) * 1979-04-09 1980-10-10 Electrolux Ab Sett och anordning vid en kombinerad kyl- och frysmobel
US4481787A (en) * 1982-07-16 1984-11-13 Whirlpool Corporation Sequentially controlled single evaporator refrigerator
US4722200A (en) * 1986-12-29 1988-02-02 Whirlpool Corporation Segregated air supply for an accurately temperature controlled compartment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5966951A (en) * 1997-06-24 1999-10-19 Ab Electrolux Absorption refrigerator with automatic defrosting
WO2002065035A1 (en) 2001-02-15 2002-08-22 Lg Electronics Inc. Auxiliary storage system for refrigerator
EP1362210A4 (de) * 2001-02-15 2005-09-07 Lg Electronics Inc Zusätzliches lagerungssystem für kühlschranke
DE102011079198A1 (de) 2011-07-14 2013-01-17 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät, insbesondere haushaltskältegerät

Also Published As

Publication number Publication date
IT8845730A0 (it) 1988-05-23
IT1220753B (it) 1990-06-21
EP0343532A3 (de) 1990-06-20

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