EP0326049A1 - Kühlvorrichtung für mehrere Temperaturen mit einem Einkompressorkühlkreislauf und mit nur einer Temperaturregelvorrichtung - Google Patents

Kühlvorrichtung für mehrere Temperaturen mit einem Einkompressorkühlkreislauf und mit nur einer Temperaturregelvorrichtung Download PDF

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Publication number
EP0326049A1
EP0326049A1 EP89101047A EP89101047A EP0326049A1 EP 0326049 A1 EP0326049 A1 EP 0326049A1 EP 89101047 A EP89101047 A EP 89101047A EP 89101047 A EP89101047 A EP 89101047A EP 0326049 A1 EP0326049 A1 EP 0326049A1
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EP
European Patent Office
Prior art keywords
temperature
evaporator
compartment
refrigerating apparatus
control device
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Withdrawn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
EP89101047A
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English (en)
French (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 EP0326049A1 publication Critical patent/EP0326049A1/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Withdrawn legal-status Critical Current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
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
    • F25D2317/065—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the air return
    • F25D2317/0653—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the air return through the mullion
    • 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
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
    • F25D2317/067—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by air ducts
    • 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
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/04—Refrigerators with a horizontal mullion
    • 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 mul­ti-temperature refrigerating apparatus of the type provided with a single-compressor refrigerating cir­cuit and a single thermostatic temperature control device.
  • One of the compartments is usually kept at a rating temperature of about +5°C for storing fresh food, while the other compartment is kept at a rating temperature of about -18°C for preserving frozen foodstuffs.
  • Refrigerators of this kind may be provi­ded with separate refrigerating circuits for the dif­ferent compartments, or may comprise a single refri­gerating circuit having a single compressor and re­levant evaporators which are hydraulically connected through valves which are controlled according to the various operative conditions.
  • the operating temperature is determined by ON/OFF cycl­ing of the compressor and is usually controlled by means of one single adjustable thermostatic device capable of monitoring the temperature of the evapo­rator which is associated with the storage compart­ment and possibly the temperature of the air inside the storage compartment.
  • the compressor is switched off when the temperature of the storage compartment evaporator decreases below a relevant, predetermined minimum value, whereas it is switched on again when the temperature of the storage compart­ment evaporator raises over a given maximum value.
  • the temperature inside the compartments depends on the duty cycle of the compressor, as well as on the general sizing of the refrigerator, the loading con­ditions and the environment temperature.
  • the evaporator of the freezing compartment is of the ventilated type, whereas the evaporator of the sto­rage compartment is a so-called "static", i.e. non-­ventilated, evaporator to prevent fresh food from being excessively dehydrated.
  • Refrigerators of the kind referred to above automatically provide for substantial defro­sting of the static evaporator of the storage com­partment during the common off-phases of the compres­sor (which are usually performed every hour and last about 30 min.).
  • the ventilated evapora­tor of the freezing compartment is defrosted perio­dically (every 24 hours, for example) by means of a timer that for short periods (e.g., 15 min.) opera­tes suitable defrost resistances and de-energizes the fan of the ventilated evaporator, and the com­pressor as well.
  • Utilization of the timer involves a co­stly and complicated construction of the whole refri­gerator, which is also scarcely reliable in opera­tion.
  • a multi-temperature refrigerating ap­paratus having a single-compressor refrigerating cir­cuit and a single thermostatic temperature control device.
  • the apparatus comprises at least a storage compartment at a temperature suitable to preserve goods and at least a further compartment at a lower temperature, each compartment being separate and pro­vided with a relevant access door, and further com­prises a static evaporator which is connected in the said circuit and is arranged in correspondence of and in heat-exchange relationship with the storage compartment.
  • the temperature control device detects the temperature of the evaporator and is capable of controlling operation of the compressor to perform cyclical evaporator defrost phases.
  • the refrigerat­ing apparatus is characterized in that the static evaporator at least partially is in heat-exchange relationship also with a conduit substantially sepa­rate with respect to the storage compartment and pro­vided with at least an inlet and at least an outlet which communicate with the said further compartment to form a closed-loop path for an air-flow which can be forced by blowing means.
  • the refrigerating apparatus comprises an insulated cabinet 6 provided with at least two separate compartments 7 and 8, respecti­vely for preserving fresh food and frozen foodstuffs, for instance.
  • Compartments 7 and 8 are provided with relevant access doors 9,10.
  • a storage compartment, 7 it is arranged a static evaporator 11 which is connected in a refrigerating circuit includ­ing also a compressor 12, a condenser 13, a dehydrat­ing filter 14 and a throttling element 15.
  • the refrigerating apparatus is further provided with a thermostatic temperature control de­vice 16, known per sè and preferably located inside the storage compartment 7.
  • At least a probe 17, capable of detect­ing the temperature of the evaporator 11, is associa­ted to the control device 16; in a way know per sé, the control device 16 determinates start and dura­tion of the ON/OFF phases of the compressor, so as to normally keep the storage compartment 7 at a pre­determined average temperature of about +5°C.
  • the thermostatic control de­vice also determinates the temperature of the fur­ther compartment 8 to be normally kept at an average value of about -18°C, for instance, which value also depends on the general sizing of the refrigerating apparatus, its loading conditions, etc.
  • the static evaporator 11 has a substantially plane configuration, is arranged ver­tically and forms an air-tight partition wall bet­ween the storage compartment 7 and a conduit 18 ex­tending upwards in correspondence of the rear wall of the cabinet 6.
  • the conduit 18 is preferably U-shaped and is in heat-ex­change relationship with the rear surface 19 of the static evaporator 11, whose front wall 20 - on the contrary - obviously is in heat-exchange relation­ship with the storage compartment 7.
  • conduit 18 termina­tes with at least an inlet aperture 21 and at least an outlet aperture 22 which communicate with the fur­ther, or freezing, compartment 8 to form a closed-­loop path for an air-flow which can be forced by blowing means like a motor-driven fan 23, or the li­ke, preferably located in the same compartment 8.
  • This air-flow is indicated by the arrows in Figs. 1 and 2 and circulates from the freezing compartment 8 through the conduit 18, where it is in heat-exchan­ge relationship with the surface 19 of the evapora­tor, and then is conveyed again into the freezing compartment 8.
  • compartment 8 advantageously is of the ventilated type and is indirectly refrige­rated by the same static evaporator 11 which also refrigerates the storage compartment 7 in which it is accomodated.
  • the static evaporator 11 is preferably provided with a substantially plane sur­face 20 and a surface 19 which is shaped in the most suitable way, for example with a finned or corruga­ted configuration, or with a fred cross-section as shown in Fig. 3, in order to increase the surface which is in heat-exchange relationship with the con­duit 18.
  • the fan 23 is controlled (in a way known per sè and now shown in Figs. 1 and 2) by the thermostatic control device 16.
  • the control device 16 operates fan 23 only during the ON phases of the compressor, whereas it de-energizes the fan during the cyclical defrost phases of the static evaporator 11.
  • an air flow is forced by the fan 23, in order to transfer to the further compartment 8 the heat-exchange occurring between evaporator 11 and conduit 18, only during the normal operation of the refrigerating circuit.
  • the de-energization of the fan 23 during the defrost phases keeps the freezing compartment 8 ther­mally insulated with respect to static evaporator 11, in this way preventing an undesirable temperature in­crease from occurring in the same compartment 8.
  • the operation of the refrigerating apparatus can be fur­ther improved by cyclically operating and de-energi­zing the fan 23, at the end and at the beginning, respectively, of the defrost phases with a delay which enables to take advantage of the thermic iner­tia of the static evaporator 11.
  • the ti­me-constant device 28 may be of any suitable type; for instance, it can be an electronic or thermoelec­tric device, or the like.
  • compressor 12 and device 28 are supplied and de-energized at the same time by the thermostatic control device 16, 17, depending on the temperature of evaporator 11; the motor-driven fan 23 is operated and de-energized via swith 27 accord­ing to the operation of the refrigerating circuit, but with a delay (determined by device 28) which ena­bles to take advantage of the thermic inertia of sta­tic evaporator 11, as stated above.
  • probe 29 is suitable to detect the temperature of static evaporator 11, li­ke probe 17 does, and to open, respectively close, swith 27 when such a temperature for instance has a value of -10°C (higher than the value in response to which switch 16 opens), respectively -15°C (lower than the value in response to which switch 16 is closed).
  • control circuit is apparent also in this case: the operation of the who­le refrigerating apparatus substantially occurs as described above with reference to Fig. 4, with the only difference that the fan 23 is cyclically actua­ted and de-energized with a delay, with respect to the corresponding operation of the compressor 12, which is not fixed but rather depends on the actual temperature of evaporator 11.
  • the fan 23 can transfer to the freezing compartment 8 the heat-exchange occurring between the static eva­porator 11 and the conduit 18 when the temperature of the same evaporator certainly has a value which at least is lower than -10°C.
  • the re­frigerating apparatus according to the invention has very good performances with regard to both com­partments 7 and 8, even though it requires one sin­gle common evaporator instead of an evaporator for each compartment.
  • the single evaporator 11 is of the static type and is cyclically defrosted, thanks to the thermostatic control device 16, with­out requiring specific defrost heating resistances and a timer for controlling the same.
  • the refrige­rating apparatus not only has a simple construction and can be easily assem­ bled, but is also particularly reliable in operation.
  • the conduit 18 can be shaped with a dif­ferent configuration and/or can be arranged in a dif­ferent region of the apparatus, for instance in cor­respondence of a side wall of the cabinet 6; more­over, the refrigerating apparatus can be arranged and set up substantially upside down with respect to the embodiment shown in Fig.1.
  • the static evaporator 11 can be made and/or positioned in a different way; for instance, it can be of the kind which is "con­cealed” with respect to the storage compartment 7, as disclosed in Italian utility model No. 201.063.
  • the refrigerating apparatus described above further includes a channel duct 24, communicating with the bottom of the conduit 18 and with a collecting vessel 30 located beneath the eva­porator 11 inside compartment 7, in order to perform drainage of the melting water from both evaporator surfaces 19 and 20, in a way known per sè.

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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)
EP89101047A 1988-01-29 1989-01-20 Kühlvorrichtung für mehrere Temperaturen mit einem Einkompressorkühlkreislauf und mit nur einer Temperaturregelvorrichtung Withdrawn EP0326049A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4570388 1988-01-29
IT45703/88A IT1220739B (it) 1988-01-29 1988-01-29 Apparecchio refrigerante a piu' temperature con circuito frigorigeno monocompressore e singola regolazione termostatica di temperatura

Publications (1)

Publication Number Publication Date
EP0326049A1 true EP0326049A1 (de) 1989-08-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP89101047A Withdrawn EP0326049A1 (de) 1988-01-29 1989-01-20 Kühlvorrichtung für mehrere Temperaturen mit einem Einkompressorkühlkreislauf und mit nur einer Temperaturregelvorrichtung

Country Status (2)

Country Link
EP (1) EP0326049A1 (de)
IT (1) IT1220739B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0651216A1 (de) * 1993-11-03 1995-05-03 Liebherr-Hausgeräte Gmbh Haushaltskühl- oder -gefrierschrank
DE29603848U1 (de) * 1996-03-01 1997-05-28 Liebherr-Hausgeräte GmbH, 88416 Ochsenhausen Kühlschrank mit einem Kühlfach und einem Kaltlagerfach
WO2001055655A1 (de) * 2000-01-25 2001-08-02 Liebherr-Hausgeräte GmbH Kühlgerät mit einem kühl-, einem kaltlager- und einem gefrierfach
EP1152200A1 (de) * 2000-05-04 2001-11-07 Hermann Forster AG Kühlschrank
EP1162420A1 (de) * 2000-06-08 2001-12-12 Whirlpool Corporation Kühlschrank
EP1255233A3 (de) * 2001-04-30 2004-06-30 F.A.S. International S.p.A. Gekühlter Verkaufsautomat
DE102011113211A1 (de) * 2011-09-12 2013-03-14 Liebherr-Hausgeräte Ochsenhausen GmbH Kühl- und/oder Gefriergerät

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB896723A (en) * 1960-02-17 1962-05-16 Gen Motors Corp Forced-air refrigerator
US3077747A (en) * 1960-12-05 1963-02-19 Jr Clark E Johnson Defrosting system for refrigeration apparatus
FR2100982A1 (de) * 1970-06-26 1972-03-31 Roberti Henri
FR2454068A1 (fr) * 1979-04-09 1980-11-07 Electrolux Ab Ensemble combine refrigerateur et congelateur et son procede de refrigeration
US4722200A (en) * 1986-12-29 1988-02-02 Whirlpool Corporation Segregated air supply for an accurately temperature controlled compartment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB896723A (en) * 1960-02-17 1962-05-16 Gen Motors Corp Forced-air refrigerator
US3077747A (en) * 1960-12-05 1963-02-19 Jr Clark E Johnson Defrosting system for refrigeration apparatus
FR2100982A1 (de) * 1970-06-26 1972-03-31 Roberti Henri
FR2454068A1 (fr) * 1979-04-09 1980-11-07 Electrolux Ab Ensemble combine refrigerateur et congelateur et son procede de refrigeration
US4722200A (en) * 1986-12-29 1988-02-02 Whirlpool Corporation Segregated air supply for an accurately temperature controlled compartment

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0651216A1 (de) * 1993-11-03 1995-05-03 Liebherr-Hausgeräte Gmbh Haushaltskühl- oder -gefrierschrank
DE29603848U1 (de) * 1996-03-01 1997-05-28 Liebherr-Hausgeräte GmbH, 88416 Ochsenhausen Kühlschrank mit einem Kühlfach und einem Kaltlagerfach
WO2001055655A1 (de) * 2000-01-25 2001-08-02 Liebherr-Hausgeräte GmbH Kühlgerät mit einem kühl-, einem kaltlager- und einem gefrierfach
US7127904B2 (en) 2000-01-25 2006-10-31 Liebherr-Hausgeräte GmbH Refrigerating appliance comprising a refrigerating compartment, a cold storage compartment and a freezer compartment
EP1152200A1 (de) * 2000-05-04 2001-11-07 Hermann Forster AG Kühlschrank
EP1162420A1 (de) * 2000-06-08 2001-12-12 Whirlpool Corporation Kühlschrank
EP1255233A3 (de) * 2001-04-30 2004-06-30 F.A.S. International S.p.A. Gekühlter Verkaufsautomat
DE102011113211A1 (de) * 2011-09-12 2013-03-14 Liebherr-Hausgeräte Ochsenhausen GmbH Kühl- und/oder Gefriergerät

Also Published As

Publication number Publication date
IT1220739B (it) 1990-06-21
IT8845703A0 (it) 1988-01-29

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