EP0250909A2 - Steuereinrichtung für einen Kühlschrank mit automatischer Abtauung - Google Patents

Steuereinrichtung für einen Kühlschrank mit automatischer Abtauung Download PDF

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Publication number
EP0250909A2
EP0250909A2 EP87108043A EP87108043A EP0250909A2 EP 0250909 A2 EP0250909 A2 EP 0250909A2 EP 87108043 A EP87108043 A EP 87108043A EP 87108043 A EP87108043 A EP 87108043A EP 0250909 A2 EP0250909 A2 EP 0250909A2
Authority
EP
European Patent Office
Prior art keywords
commutator
evaporator
thermostat
electric power
controlled
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
EP87108043A
Other languages
English (en)
French (fr)
Other versions
EP0250909A3 (en
EP0250909B1 (de
Inventor
Paolo Marega
Luigi Paroni
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 EP0250909A2 publication Critical patent/EP0250909A2/de
Publication of EP0250909A3 publication Critical patent/EP0250909A3/en
Application granted granted Critical
Publication of EP0250909B1 publication Critical patent/EP0250909B1/de
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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • F25D21/008—Defroster control by timer
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2117—Temperatures of an evaporator

Definitions

  • the present invention relates to a device for controlling the operation of refrigerating apparatus of the so-called "no frost" type, i.e. comprising at least one evaporator which is periodically defrosted in an automatic manner.
  • apparatus of this type usually refrig­erators, comprise a substantially conventional refrigerant circuit including a compressor, a condenser, a throttle element and an evaporator.
  • the evaporator is preferably of the finned type and adapted to have a fan and defrosting heater means associated thereto.
  • ventil­ated evaporator be periodically defrosted in an automatic manner.
  • refrigerant apparatus of the type comprising a ventilated evaporator with an automatic defrosting control assembly of the type shown in fig. 1.
  • the motor 3 of the com­pressor and the motor 4 of the fan 5 associated to the evaporator are disposed in parallel and adapted to be connected to the terminals 6, 7 of an electric power supply through a thermostat breaker switch 8 and a con­trolled commutator switch 9 lying in series therewith.
  • thermostat breaker switch 8 is of the normally closed type and adapted to open when the temper­ature of the compartment cooled by the ventilated evapor­ator attains the desired nominal value of for instance -18°C.
  • Commutator switch 9 is controlled by an electromechanic or electronic timer 10 directly connected to terminals 6, 7 of the electric power supply.
  • Commutator switch 9 is norm­ally in the position shown in full lines for supplying power to electric motors 3 and 4, and is cyclically, for instance once in 24 hours, actuated by timer 10 to switch to the position shown in dotted lines for supplying power to at least one defrosting resistance heater 12 of the ventilated evaporator through a thermostat breaker switch 11.
  • Commutator switch 9 remains in its defrosting position for a preselected period of for instance 30 minutes, thermostat breaker switch 11 being normally closed an adapted to open when the evaporator attains a preselected temperature of for instance +5 °C considered sufficient for the defrosting operation.
  • timer 10 as well as motors 3 and 4 of the compressor and fan, respectively, are ener­gized, so that the refrigerant circuit is maintained in operation for the entire period determined by timer 10.
  • the latter cyclically actuates commutator switch 9 to assume the position shown in dotted lines for a fixed defrosting period during which motors 3 and 4 are deenerg­ized while defrosting resistance heater 12 is being energized. If thermostat breaker switch 11 indicates that the evaporator has attained its defrosting temperature before termination of the fixed period, resistance heater 12 is deenergized, whereas the refrigerant circuit is only reactivated on termination of the prefixed defrosting per­iod.
  • resistance heater 12 is deenerg­ized and motors 3 and 4 are again energized, even if for any reason the evaporator has not yet been completely defrosted.
  • the refrigerant circuit resumes its operation under anomalous conditions adversely affect­ing the overall performance of the refrigerating apparatus.
  • this object is attained in a control apparatus for a refrigerating appliance having a refrigerant circuit including a compressor and at least one evaporator of the automatic defrosting type, comprising a commutator switch controlled by timing means for cyclically switching from a first operative position, in which electric power is supplied to the motor of the compressor, to a second operative position, in which electric power is supplied to evaporator defrosting means via a thermostatic commutator switch when the latter is in a first operative position corresponding to a pre­determined low temperature value of the evaporator.
  • This control apparatus is characterized in that said thermostat commutator switch assumes a second operative position in response to a predetermined higher temperature value of said evaporator, said timing means being adapted to have electric power supplied thereto through said controlled commutator switch when in its first operative position, and through a series-connection of said controlled commut­ator switch and said thermostat commutator switch when in their respective second operative positions.
  • Fig. 2 shows a preferred embodiment of the control appar­atus according to the invention, wherein components corres­ponding to ones shown in fig. 1 are designated by the same reference numerals.
  • the control apparatus of fig. 2 sub­stantially shows only a few basic differences with respect to the embodiment of fig. 1.
  • timer 10 is not directly connected to terminals 6 and 7 of the electric power supply, but through commutator switch 9 controlled by itself. More specifically, timer 10 is supplied with electric power through commutator switch 9 when the latter is in its normal operative position indicated in full lines in fig.2.
  • thermo­stat commutator 11 which is responsive to the temperature of the evaporator (not shown), is of the type having two operative positions. More specifically, thermo­stat commutator 11 assumes the position shown in full lines in fig. 2 in response to a low temperature of for instance -20 °C of the evaporator, and the position shown in dotted lines in response to a higher temperature of for instance +5 °C.
  • connection 13 ensures that in the same manner as motors 3 and 4, timer 10 is supplied with electric power via the series-­connection of commutators 9 and 11 when they are both in the operative positions shown by dotted lines in fig. 2.
  • Timer 10 is effective to control commutator switch 9 in such a manner that it is normally in the operative position shown in full lines, and is cyclically, for instance once in 24 hours, switched to the operative position shown in dotted lines for a relatively short period of time of for instance 2 minutes.
  • This period of time is preferably shorter than the period of for example 5 minutes required by thermostat commutator 11, during normal operation of the refrigerating appliance, on termination of each evaporator defrosting operation to switch from the posit­ion shown in dotted lines and corresponding to the temper­ature of about +5 °C, to the position shown in full lines and corresponding to the temperature of about -20 °C.
  • the timing of this switching operation is of course calculated on the base of the operating characteristics of the refrig­erating appliance as a whole.
  • control apparatus The operation of the control apparatus according to the invention is substantially conventional and need not be described in detail. It is merely intended to point out some functional aspects deriving from the above indicated characteristics.
  • thermostat commutator 11 senses a low temperature of the evaporator (e.g. -20 °C), and is therefor in the operative position indicated in full lines, while commutator 9 is actuated by timer 10 to assume the position shown in dotted lines.
  • a low temperature of the evaporator e.g. -20 °C
  • thermostat breaker switch 8 is in its normally closed state.
  • thermostat switch 8 is adapted to open to thereby deenergize motors 3 and 4 when the temperature of the compartment refrigerated by the ventil­ated evaporator attains a predetermined low value.

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)
  • Defrosting Systems (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
EP87108043A 1986-07-03 1987-06-03 Steuereinrichtung für einen Kühlschrank mit automatischer Abtauung Expired EP0250909B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT45734/86A IT1201778B (it) 1986-07-03 1986-07-03 Dispositivo di controllo per apparecchio refrigerante a sbrinamento automatico
IT4573486 1986-07-03

Publications (3)

Publication Number Publication Date
EP0250909A2 true EP0250909A2 (de) 1988-01-07
EP0250909A3 EP0250909A3 (en) 1989-04-26
EP0250909B1 EP0250909B1 (de) 1992-10-28

Family

ID=11257891

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87108043A Expired EP0250909B1 (de) 1986-07-03 1987-06-03 Steuereinrichtung für einen Kühlschrank mit automatischer Abtauung

Country Status (4)

Country Link
EP (1) EP0250909B1 (de)
DE (1) DE3782363T2 (de)
ES (1) ES2035831T3 (de)
IT (1) IT1201778B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2587098A1 (fr) * 1985-09-12 1987-03-13 Candy Elettrodomestici Appareil frigorifique equipe d'un dispositif de degivrage perfectionne
DE4006468C1 (en) * 1990-03-01 1991-08-08 Danfoss A/S, Nordborg, Dk Defroster for refrigerator using compressor motor - supplied with electricity via thermostat switch controlled by sensor and actuator
EP0598612A3 (de) * 1992-11-18 1995-02-22 Whirlpool Co Steuereinrichtung des Abtauprozesses.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854915A (en) * 1973-04-10 1974-12-17 Amf Inc Demand defrost control system
US4346564A (en) * 1979-03-31 1982-08-31 Ranco Incorporated Defrosting control apparatus
US4373350A (en) * 1981-07-09 1983-02-15 General Electric Company Heat pump control/defrost circuit
US4439995A (en) * 1982-04-05 1984-04-03 General Electric Company Air conditioning heat pump system having an initial frost monitoring control means
US4530218A (en) * 1984-02-27 1985-07-23 Whirlpool Corporation Refrigeration apparatus defrost control

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2587098A1 (fr) * 1985-09-12 1987-03-13 Candy Elettrodomestici Appareil frigorifique equipe d'un dispositif de degivrage perfectionne
DE4006468C1 (en) * 1990-03-01 1991-08-08 Danfoss A/S, Nordborg, Dk Defroster for refrigerator using compressor motor - supplied with electricity via thermostat switch controlled by sensor and actuator
EP0598612A3 (de) * 1992-11-18 1995-02-22 Whirlpool Co Steuereinrichtung des Abtauprozesses.

Also Published As

Publication number Publication date
IT8645734A0 (it) 1986-07-03
EP0250909A3 (en) 1989-04-26
EP0250909B1 (de) 1992-10-28
IT1201778B (it) 1989-02-02
ES2035831T3 (es) 1993-05-01
DE3782363D1 (de) 1992-12-03
DE3782363T2 (de) 1993-03-11

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