EP1037003A2 - Freezing apparatus - Google Patents

Freezing apparatus Download PDF

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Publication number
EP1037003A2
EP1037003A2 EP99125803A EP99125803A EP1037003A2 EP 1037003 A2 EP1037003 A2 EP 1037003A2 EP 99125803 A EP99125803 A EP 99125803A EP 99125803 A EP99125803 A EP 99125803A EP 1037003 A2 EP1037003 A2 EP 1037003A2
Authority
EP
European Patent Office
Prior art keywords
temperature
freezer
compressor
during
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.)
Granted
Application number
EP99125803A
Other languages
German (de)
French (fr)
Other versions
EP1037003B1 (en
EP1037003A3 (en
Inventor
Matthias Wiest
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.)
Liebherr Hausgeraete Ochsenhausen GmbH
Original Assignee
LIEBHERR-HAUSGERAETE GmbH
Liebherr Hausgeraete Ochsenhausen GmbH
Liebherr Hausgeraete GmbH
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 LIEBHERR-HAUSGERAETE GmbH, Liebherr Hausgeraete Ochsenhausen GmbH, Liebherr Hausgeraete GmbH filed Critical LIEBHERR-HAUSGERAETE GmbH
Publication of EP1037003A2 publication Critical patent/EP1037003A2/en
Publication of EP1037003A3 publication Critical patent/EP1037003A3/en
Application granted granted Critical
Publication of EP1037003B1 publication Critical patent/EP1037003B1/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
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • F25D21/006—Defroster control with electronic control circuits
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles

Definitions

  • the invention relates to a freezer with a blower that is forced to Cooling circulating air via an evaporator, a compressor and a condenser including cooling circuit, and with a heater that during defrosting phases, during which preferably the compressor and the blower are out of operation, defrost the evaporator.
  • the temperature in the frozen food increases during the defrosting phases from the target value of approximately -18 ° C to a temperature in the range from -16 ° C to -17 ° C.
  • the object of the invention is therefore to provide a freezer of the type mentioned to create, in which no undesirable temperature increase during the defrosting phases in the frozen food above the target value.
  • this object is achieved in that a control device is provided that the temperature in the freezer compartment or in the frozen goods to a value below the target value.
  • the freezer it is ensured that during the defrosting phases the temperature in the frozen food does not rise above the target value since before each defrost phase by temporarily lowering the freezer compartment and frozen food temperature a cold reserve is created during the defrost phase ensures that the temperature in the frozen food does not exceed the setpoint increases.
  • the control device which is usually an electronic control device deals with a microprocessor, knows the defrost phases so that they the temperature drop in a reasonable time before the start of the defrosting phase can initiate and make.
  • the melting of the ice layer formed on the evaporator takes place during the defrost phase in a known manner, for example by electricity or heating gas.
  • the temperature drop before each defrost phase can be due to a longer run time of the compressor, through a higher compressor output and also by increasing the speed of the fan.
  • the compressor performance can be easily Way with variable speed compressors by increasing the compressor speed cause.
  • the temperature drop before each defrost phase can be about 1 ° C below the target value respectively. Larger or smaller reductions can be appropriate.
  • the control device can lower the temperature in the freezer compartment done in a simple manner before each defrosting phase in that the control device the switch-off value for the thermostat in the freezer lowers the lower value.
  • the temperature is plotted against time in the diagram.
  • Diagram shows the solid horizontal line 1 the target temperature of the Refrigerated goods, which is around -18 ° C.
  • the temperature in the freezer rises and falls sinusoidally, namely according to the switching on and off of the compressor, which is via a temperature sensor is controlled by the electronic control of the freezer.
  • the sinusoidal temperature profile is due to the wavy line 2 in the left part of the diagram shown, the highest temperatures just about with the target value 1 match.
  • a lowering takes place before the defrosting phase the freezer compartment temperature and thus also the temperature of the frozen goods between the lines characterizing the area of the temperature drop. Is the temperature of the frozen goods has been reduced to about -20 ° C to -21 ° C the compressor and the blower are switched off and it will start defrosting of the evaporator started.
  • the vertical Dashes the temperature in the freezer and in the frozen food increases on, but only in the manner shown below the target value 1.
  • the defrost phase has the temperature of the frozen food, as can be seen in the diagram, has not yet reached the target value, but is still below this, so that normal freezing can be resumed without the Temperature has risen above the set temperature.

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

Abstract

The freezer has a fan that forces ambient air to be cooled over an evaporator of a coolant circuit contg. a compressor and a condenser and a heater that thaws the evaporator during thawing phases, during which the compressor and fan are pref. not operating. A controller lowers the temp. in the freezer compartment or of the frozen goods to below the desired value before each thawing phase.

Description

Die Erfindung betrifft ein Gefriergerät mit einem Gebläse, das zwangsweise zu kühlende Umluft über einen Verdampfer eines einen Kompressor und einen Kondensator einschließenden Kältekreislaufs führt, und mit einer Heizeinrichtung, die während Abtauphasen, während der vorzugsweise der Kompressor und das Gebläse außer Betrieb sind, den Verdampfer abtaut.The invention relates to a freezer with a blower that is forced to Cooling circulating air via an evaporator, a compressor and a condenser including cooling circuit, and with a heater that during defrosting phases, during which preferably the compressor and the blower are out of operation, defrost the evaporator.

Bei Gefriergeräten dieser Art schlägt sich von der Zwangsumluft mitgeführte Feuchtigkeit auf dem Verdampfer nieder, so daß sich auf diesem eine Eisschicht bildet, die während in größeren Abständen aufeinanderfolgenden Abtauphasen abgeschmolzen werden muß. Das von dem Verdampfer abtropfende ober ablaufende Wasser wird aufgefangen und in üblicher Weise abgeführt und vorzugsweise verdunstet. Das Abtauen des Verdampfers während der Abtauphasen kann in bekannter Weise durch Strom oder Heizgas erfolgen.In freezers of this type, the forced air entrains itself Moisture settles on the evaporator so that there is an ice layer on it forms, which melted during successive defrosting phases must become. The top draining from the evaporator Water is collected and removed in the usual way and preferably evaporated. Defrosting the evaporator during the defrost phases can be done in a known manner Way done by electricity or heating gas.

Bei bekannten Gefriergeräten ergibt sich während der Abtauphasen, während der Kompressor und das Gebläse außer Betrieb sind, zwangsläufig in dem Gefrierraum und auch in dem Gefriergut eine unerwünschte Temperaturerhöhung über den Soll-Wert. Beispielsweise steigt während der Abtauphasen die Temperatur in dem Gefriergut von dem Soll-Wert von etwa -18°C auf eine Temperatur an, die im Bereich von -16°C bis -17°C liegen kann.In known freezers results during the defrosting phases, during the The compressor and the blower are inoperative in the freezer compartment and also in the frozen goods an undesirable temperature increase above the target value. For example, the temperature in the frozen food increases during the defrosting phases from the target value of approximately -18 ° C to a temperature in the range from -16 ° C to -17 ° C.

Aufgabe der Erfindung ist es daher, ein Gefriergerät der eingangs angegebenen Art zu schaffen, bei dem während der Abtauphasen keine unerwünschte Temperaturerhöhung in dem Gefriergut über den Soll-Wert erfolgt.The object of the invention is therefore to provide a freezer of the type mentioned to create, in which no undesirable temperature increase during the defrosting phases in the frozen food above the target value.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß eine Steuereinrichtung vorgesehen ist, die vor jeder Abtauphase die Temperatur in dem Gefrierraum bzw. in dem Gefriergut auf einen Wert unter den Soll-Wert absenkt.According to the invention, this object is achieved in that a control device is provided that the temperature in the freezer compartment or in the frozen goods to a value below the target value.

Bei dem erfindungsgemäßen Gefriergerät ist gewährleistet, daß während der Abtauphasen die Temperatur in dem Gefriergut nicht über den Soll-Wert ansteigt, da vor jeder Abtauphase durch vorübergehende tiefere Absenkung der Gefrierraum- und Gefrierguttemperatur eine Kältereserve geschaffen wird, die während der Abtauphase gewährleistet, daß die Temperatur in dem Gefriergut nicht über den Soll-Wert ansteigt.In the freezer according to the invention it is ensured that during the defrosting phases the temperature in the frozen food does not rise above the target value since before each defrost phase by temporarily lowering the freezer compartment and frozen food temperature a cold reserve is created during the defrost phase ensures that the temperature in the frozen food does not exceed the setpoint increases.

Die Steuereinrichtung, bei der es sich in der Regel um eine elektronische Steuereinrichtung mit einem Mikroprozessor handelt, kennt die Abtauphasen, so daß sie in einer angemessenen Zeit vor Beginn der Abtauphase die Temperaturabsenkung einleiten und vornehmen kann.The control device, which is usually an electronic control device deals with a microprocessor, knows the defrost phases so that they the temperature drop in a reasonable time before the start of the defrosting phase can initiate and make.

Das Abschmelzen der auf den Verdampfer gebildeten Eisschicht erfolgt während der Abtauphase in bekannter Weise, beispielsweise durch Strom oder Heizgas.The melting of the ice layer formed on the evaporator takes place during the defrost phase in a known manner, for example by electricity or heating gas.

Die Temperaturabsenkung vor jeder Abtauphase kann durch eine längere Laufzeit des Kompressors, durch eine höhere Kompressorleistung und auch durch Drehzahlerhöhung des Gebläses erfolgen. Die Kompressorleistung läßt sich auf einfache Weise bei drehzahlvariablen Kompressoren durch Erhöhung der Kompressordrehzahl bewirken. The temperature drop before each defrost phase can be due to a longer run time of the compressor, through a higher compressor output and also by increasing the speed of the fan. The compressor performance can be easily Way with variable speed compressors by increasing the compressor speed cause.

Die Temperaturabsenkung vor jeder Abtauphase kann etwa um 1°C unter Soll-Wert erfolgen. Größere oder kleinere Absenkungen können zweckmäßig sein.The temperature drop before each defrost phase can be about 1 ° C below the target value respectively. Larger or smaller reductions can be appropriate.

Die Absenkung der Temperatur in dem Gefrierraum kann durch die Steuereinrichtung in einfacher Weise vor jeder Abtauphase dadurch erfolgen, daß die Steuereinrichtung den Ausschaltwert für den im Gefrierraum befindlichen Thermostaten auf den tieferen Wert senkt.The control device can lower the temperature in the freezer compartment done in a simple manner before each defrosting phase in that the control device the switch-off value for the thermostat in the freezer lowers the lower value.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung, in der in einem Diagramm der Verlauf der Temperaturkurven dargestellt ist, näher erläutert.An embodiment of the invention is described below with reference to the drawing in which is shown in a diagram of the course of the temperature curves, explained in more detail.

In dem Diagramm ist die Temperatur über der Zeit aufgetragen worden. In dem Diagramm zeigt die durchgezogene waagerechte Linie 1 die Soll-Temperatur des Kühlguts an, die bei etwa -18°C liegt. Während des normalen Gefriergerätbetriebes steigt und fällt die Temperatur in dem Gefrierraum sinusförmig an und ab, und zwar entsprechend der Ein- und Ausschaltung des Kompressors, der über einen Temperaturfühler von der elektronischen Steuerung des Gefriergeräts gesteuert wird. Der sinusförmige Temperaturverlauf ist durch die Wellenlinie 2 im linken Teil des Diagramms dargestellt, wobei die höchsten Temperaturen etwa gerade mit dem Soll-Wert 1 übereinstimmen.The temperature is plotted against time in the diagram. By doing Diagram shows the solid horizontal line 1 the target temperature of the Refrigerated goods, which is around -18 ° C. During normal freezer operation the temperature in the freezer rises and falls sinusoidally, namely according to the switching on and off of the compressor, which is via a temperature sensor is controlled by the electronic control of the freezer. The sinusoidal temperature profile is due to the wavy line 2 in the left part of the diagram shown, the highest temperatures just about with the target value 1 match.

Im Stand der Technik ist es bekannt, während der Abtauphase den Kompressor und das Gebläse abzustellen, so daß die Gefrierraumtemperatur und damit auch die Temperatur des Kühlguts ansteigt, wie es die gestrichelte Kurve 2 zwischen den die Abtauphase kennzeichnenden Linien zeigt. Erst nach Beendigung der Abtauphase werden der Kompressor und das Gebläse wieder eingeschaltet, so daß sich im rechten Teil des Diagramms wieder der übliche Gefrierbetrieb ergibt, bei dem die Kühlraumtemperatur sinusförmig ansteigt und abfällt. It is known in the prior art to use the compressor during the defrost phase and turn off the blower so that the freezer compartment temperature and thus also the temperature of the refrigerated goods rises, as is the dashed curve 2 between the the lines showing the defrosting phase. Only after the defrost phase has ended the compressor and the blower are switched on again, so that in the right part of the diagram the usual freezing mode again results, in which the cold room temperature rises and falls sinusoidally.

Bei dem erfindungsgemäßen Gefriergerät erfolgt vor der Abtauphase eine Absenkung der Gefrierraumtemperatur und damit auch der Temperatur des Gefrierguts zwischen den den Bereich der Temparturabsenkung kennzeichnenden Linien. Ist die Temperatur des Gefrierguts etwa auf -20°C bis -21 °C abgesenkt worden, werden der Kompressor und das Gebläse abgeschaltet und es wird mit dem Abtauen des Verdampfers begonnen. Während dieser Abtauphase, die durch die senkrechten Striche gekennzeichnet ist, steigt die Temperatur im Gefrierraum und im Gefriergut an, aber nur in der dargestellten Weise bis unter den Soll-Wert 1. Bei Beendigung der Abtauphase hat die Gefrierguttemperatur, wie aus dem Diagramm ersichtlich, noch nicht den Soll-Wert erreicht, sondern er liegt noch unter diesem, so daß der normale Gefrierbetrieb wieder aufgenommen werden kann, ohne daß die Temperatur über die Soll-Temperatur gestiegen ist.In the freezer according to the invention, a lowering takes place before the defrosting phase the freezer compartment temperature and thus also the temperature of the frozen goods between the lines characterizing the area of the temperature drop. Is the temperature of the frozen goods has been reduced to about -20 ° C to -21 ° C the compressor and the blower are switched off and it will start defrosting of the evaporator started. During this defrost phase, the vertical Dashes, the temperature in the freezer and in the frozen food increases on, but only in the manner shown below the target value 1. At termination the defrost phase has the temperature of the frozen food, as can be seen in the diagram, has not yet reached the target value, but is still below this, so that normal freezing can be resumed without the Temperature has risen above the set temperature.

Claims (6)

Gefriergerät mit einem Gebläse, das zwangsweise zu kühlende Umluft über einen Verdampfer eines einen Kompressor und einen Kondensator einschließenden Kältekreislaufs führt, und mit einer Heizeinrichtung, die während Abtauphasen, während der vorzugsweise der Kompressor und das Gebläse außer Betrieb sind, den Verdampfer abtaut,
dadurch gekennzeichnet,
daß eine Steuereinrichtung vorgesehen ist, die vor jeder Abtauphase die Temperatur in dem Gefrierraum bzw. dem Gefriergut auf einen Wert unter dem Soll-Wert absenkt.Freezer with a blower that forcibly circulates the recirculated air through an evaporator of a refrigeration circuit including a compressor and a condenser, and with a heating device that defrosts the evaporator during defrosting phases, during which the compressor and the blower are preferably out of operation,
characterized,
that a control device is provided which lowers the temperature in the freezer compartment or the frozen goods to a value below the target value before each defrosting phase. Gefriergerät nach Anspruch 1, dadurch gekennzeichnet, daß die Temperaturabsenkung durch eine längere Laufzeit des Kompressors erfolgt. Freezer according to claim 1, characterized in that the temperature drop due to a longer running time of the compressor. Gefriergerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Temperaturabsenkung durch eine höhere Kompressorleistung erfolgt.Freezer according to claim 1 or 2, characterized in that the temperature reduction done by a higher compressor output. Gefriergerät nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Temperaturabsenkung durch Drehzahlerhöhung des Gebläses erfolgt.Freezer according to one of claims 1 to 3, characterized in that the temperature is reduced by increasing the speed of the fan. Gefriergerät nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Temperaturabsenkung etwa 1°C unter den Soll-Wert beträgt.Freezer according to one of claims 1 to 4, characterized in that the temperature drop is about 1 ° C below the target value. Gefriergerät nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Steuereinrichtung vor jeder Abtauphase den Ausschaltwert für den im Gefrierraum befindlichen Thermostat auf den tieferen Wert setzt.Freezer according to one of claims 1 to 5, characterized in that the control device sets the switch-off value for the in the freezer compartment before each defrost phase thermostat to the lower value.
EP99125803A 1999-03-17 1999-12-23 Freezing apparatus Expired - Lifetime EP1037003B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19911979 1999-03-17
DE19911979A DE19911979A1 (en) 1999-03-17 1999-03-17 Freezer

Publications (3)

Publication Number Publication Date
EP1037003A2 true EP1037003A2 (en) 2000-09-20
EP1037003A3 EP1037003A3 (en) 2000-10-25
EP1037003B1 EP1037003B1 (en) 2003-06-25

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Application Number Title Priority Date Filing Date
EP99125803A Expired - Lifetime EP1037003B1 (en) 1999-03-17 1999-12-23 Freezing apparatus

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EP (1) EP1037003B1 (en)
AT (1) ATE243452T1 (en)
DE (2) DE19911979A1 (en)
ES (1) ES2203000T3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112050532A (en) * 2020-09-15 2020-12-08 长虹美菱股份有限公司 Single-system refrigerator constant-temperature chamber and control method thereof
IT202100000182A1 (en) * 2021-01-07 2022-07-07 Carel Ind Spa METHOD OF OPERATING A REFRIGERATOR EQUIPMENT AND REFRIGERATOR EQUIPMENT

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114353299B (en) * 2021-12-07 2023-06-16 珠海格力电器股份有限公司 Control method of air conditioning system and air conditioning system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4569205A (en) * 1983-07-25 1986-02-11 Kabushiki Kaisha Toshiba Electric refrigerator having improved freezing and defrosting characteristics
US4646536A (en) * 1984-10-05 1987-03-03 Kabushiki Kaisha Toshiba Refrigeration with automatic defrost and rapid cooling
US5038575A (en) * 1987-02-14 1991-08-13 Kabushiki Kaisha Toshiba Refrigerator with defrost override system
JPH09138045A (en) * 1995-11-15 1997-05-27 Matsushita Refrig Co Ltd Operation control device for refrigerator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4569205A (en) * 1983-07-25 1986-02-11 Kabushiki Kaisha Toshiba Electric refrigerator having improved freezing and defrosting characteristics
US4646536A (en) * 1984-10-05 1987-03-03 Kabushiki Kaisha Toshiba Refrigeration with automatic defrost and rapid cooling
US5038575A (en) * 1987-02-14 1991-08-13 Kabushiki Kaisha Toshiba Refrigerator with defrost override system
JPH09138045A (en) * 1995-11-15 1997-05-27 Matsushita Refrig Co Ltd Operation control device for refrigerator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 09, 30. September 1997 (1997-09-30) & JP 09 138045 A (MATSUSHITA REFRIG CO LTD), 27. Mai 1997 (1997-05-27) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112050532A (en) * 2020-09-15 2020-12-08 长虹美菱股份有限公司 Single-system refrigerator constant-temperature chamber and control method thereof
IT202100000182A1 (en) * 2021-01-07 2022-07-07 Carel Ind Spa METHOD OF OPERATING A REFRIGERATOR EQUIPMENT AND REFRIGERATOR EQUIPMENT
EP4027082A1 (en) * 2021-01-07 2022-07-13 Carel Industries S.p.A. Method of actuation of a refrigeration apparatus and refrigeration apparatus

Also Published As

Publication number Publication date
ES2203000T3 (en) 2004-04-01
EP1037003B1 (en) 2003-06-25
DE19911979A1 (en) 2000-09-28
EP1037003A3 (en) 2000-10-25
DE59906091D1 (en) 2003-07-31
ATE243452T1 (en) 2003-07-15

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