EP1742001B1 - Refrigerator and/or freezing apparatus - Google Patents

Refrigerator and/or freezing apparatus Download PDF

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Publication number
EP1742001B1
EP1742001B1 EP20060013973 EP06013973A EP1742001B1 EP 1742001 B1 EP1742001 B1 EP 1742001B1 EP 20060013973 EP20060013973 EP 20060013973 EP 06013973 A EP06013973 A EP 06013973A EP 1742001 B1 EP1742001 B1 EP 1742001B1
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EP
European Patent Office
Prior art keywords
value
switch
evaporator
refrigerator
temperature
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.)
Expired - Fee Related
Application number
EP20060013973
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German (de)
French (fr)
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EP1742001A2 (en
EP1742001A3 (en
Inventor
Holger Jendrusch
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Liebherr Hausgeraete Ochsenhausen GmbH
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Liebherr Hausgeraete Ochsenhausen GmbH
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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
    • F25D29/00—Arrangement or mounting of control or safety devices
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/29—High ambient 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/31—Low ambient 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • 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
    • 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
    • F25D2700/14—Sensors measuring the temperature outside the refrigerator or freezer

Definitions

  • the invention relates to a refrigerator and / or freezer with a cooling circuit comprising at least one evaporator and at least one compressor, with a temperature sensor arranged in the region of the evaporator and with a control unit, which is in communication with the temperature sensor and with the compressor and the is designed so that it turns on the compressor when the temperature measured by means of the temperature sensor exceeds an upper limit (switch-on).
  • Known refrigerators and fridge-freezers have an evaporator on which a temperature sensor is arranged, which emits a characteristic of the evaporator temperature actual temperature. If the evaporator temperature increases when the compressor of the refrigeration circuit is switched off due to the incidence of heat and if this exceeds the 0 ° C limit, the evaporator defrosts. The defrosting of the evaporator is desirable to always ensure a good efficiency of the evaporator and thus a good cooling performance. If the actual temperature value determined by means of the evaporator temperature sensor reaches or exceeds a certain limit value (referred to below as the switch-on value), causes a control unit to turn on the compressor, whereupon the evaporator temperature drops.
  • a certain limit value referred to below as the switch-on value
  • the compressor When a lower limit value is reached (referred to below as the switch-off value), the compressor is switched off again. Due to the incidence of heat it comes again to a warming and thus to an increase in temperature at the evaporator temperature sensor, which again causes the control unit to turn on the compressor when the switch-on is reached again or exceeded.
  • the temperature during operation of the refrigerator and / or freezer oscillates between two values, wherein the resulting temperature profile may be, for example, sinusoidal or sawtooth with straight or curved lines or flanks.
  • the switch-on of the evaporator sensor is set correspondingly high, that is, the limit at which the compressor is turned on again, is comparatively high. This ensures that the evaporator is exposed for a sufficient amount of time to a temperature at which defrosting can occur.
  • a disadvantage of this high setting of the switch-on value is that this value has an effect at medium ambient temperatures, for example at 25 ° C. or even higher values, in such a way that comparatively large temporal temperature fluctuations occur in the space to be cooled, which is not optimal for energetic reasons is.
  • the setting temperature of the refrigeration section is calculated from the minimum and maximum values of the standard measuring points of the room to be cooled, said switch-on value considerably influences this setting temperature. If very high ambient temperatures, for example from 38 ° C. to 43 ° C., may result that the required minimum value of 5 ° C. of the cooling part is no longer achieved due to the comparatively high switch-on value, which precludes suitability of the device for certain areas of use can.
  • the US 6,006,530 discloses a refrigerator in the interior of which a fan is arranged to introduce the cold air cooled by the evaporator into the refrigeration compartment.
  • the fan is operated so that its rotational speed is increased with decreasing evaporator temperature.
  • the apparatus includes or is in communication with an ambient temperature sensor which senses the ambient temperature of the refrigerator and / or freezer, and that there is provided a unit for changing the ON value associated with the ambient temperature sensor and such is designed that at higher ambient temperatures, a lower switch-on value is set or selected as compared to lower ambient temperatures.
  • the control behavior of the device is thus improved by the use of an ambient temperature sensor and by the ambient temperature dependent switch-on values, that is to say limit values of the evaporator temperature at which the compressor is switched on.
  • the turn-on of the evaporator sensor, in which the compressor is turned on be set much lower at high ambient temperatures. It is conceivable, for example, that the limit at which the control unit causes the compressor to switch on is at low ambient temperatures at + 5 ° C. and at high ambient temperatures, for example at 0 ° C. or even lower.
  • switch-on values of less than 0 ° C is conceivable, as the temperature curve will reverberate after switching on the compressor so that a temperature rise above 0 ° C can occur, even if the switch-on value is 0 ° C or below 0 ° C ,
  • the unit for changing the switch-on value is designed such that the switch-on value is not changed within predetermined ranges of the ambient temperature and is reduced when reaching or exceeding an upper range limit and increased when a lower range limit is reached or exceeded. It is conceivable, for example, that one, two, three or more than three such areas are provided.
  • control unit has a characteristic map which has certain ambient temperature ranges and upper limit values assigned thereto, that is, switch-on values for switching on the compressor.
  • control unit checks in which area the temperature measured by means of the evaporator temperature sensor falls and then determines the associated switch-on value.
  • the unit for changing the switch-on value is designed such that the switch-on value is changed continuously with the change of the ambient temperature. It is conceivable, for example, that the correct switch-on value based on the measured ambient temperature value is determined on the basis of a formula-related relationship between the ambient temperature and the switch-on value.
  • the change of the upper limit value or of the switch-on value can thus take place stepwise or continuously.
  • the unit for changing the switch-on is part of the control unit.
  • the unit for changing the switch-on value and the control unit are two separate components. It can thus be a structural unit or even different units.
  • a test means which compares the actual value of the temperature of the space to be cooled, for example, the cooling compartment of the device with a desired value and which is designed such that it makes a correction of the switch-on if the temperature setpoint is not or not within reached or fallen short of a certain period of time.
  • the test means makes a reduction of the switch-on value, so that the compressor is already switched on at lower temperatures and thus earlier a cooling power is generated. In this way, a compromise between achieving the desired temperature of the space to be cooled and ensuring the defrosting of the evaporator can be achieved.
  • the temperature sensor can be arranged directly on the evaporator, preferably in a sensor channel arranged on the evaporator or also in the region of the evaporator. It thus measures the evaporator temperature or the temperature of the atmosphere immediately surrounding the evaporator.
  • the control unit is designed such that it switches off the compressor when the temperature measured by the temperature sensor falls below a lower limit, ie a switch-off and that the switch-off is also changed in a change of the switch-on. It is conceivable that at a subsidence of the switch-on value, which makes sense at comparatively high ambient temperatures, cooling down to a very low switch-off value is not absolutely necessary. It can therefore be provided that the switch-off value is raised when the switch-on value is reduced, so that the span between the two limit values and thus also the temperature fluctuations are reduced.
  • the refrigerator and / or freezer according to the invention has a control unit which is connected on the one hand to the compressor of the cooling circuit and on the other hand with a temperature sensor which is received in a sensor channel of the evaporator of the device. Furthermore, a temperature sensor is connected to the control unit, which detects the ambient temperature of the device.
  • the ambient temperature sensor may be located directly on the device or even spaced therefrom.
  • the control unit has a map in which three ranges of ambient temperature with associated turn-on values, i. with the values of the measured by the evaporator temperature sensor temperature at which the compressor of the device is turned on, are linked.
  • the map is designed such that low ambient temperatures in the range below 16 ° C, for example, between 10 ° C and 16 ° C relatively high switch-on, that is, upper limits of, for example, 5 ° C are assigned. If the evaporator temperature sensor reports this temperature value, the control unit causes the compressor to be switched on at an ambient temperature in the range between 10 ° C and 16 ° C. As long as the temperature in the area of the evaporator is above 0 ° C, defrosting of the evaporator occurs.
  • the map of the control unit comprises a second range, for example, above 16 ° C to 38 ° C of the ambient temperature, which is associated with a lower turn-on value, for example, of 2.5 ° C.
  • a second range for example, above 16 ° C to 38 ° C of the ambient temperature, which is associated with a lower turn-on value, for example, of 2.5 ° C.
  • the map of the control unit has a third range from 38 ° C, for example, 38 ° C to 43 ° C, the low turn-on, for example, 0 ° C are assigned. If the value of 0 ° C is measured by the evaporator temperature sensor at such a high ambient temperature, the compressor is switched on. The switching on of the compressor and the associated cooling at comparatively low temperatures has the advantage that the cold room temperature can be maintained even at very high ambient temperatures, so that the required climate class ST (subtropical) or T (tropical) can be achieved.
  • the present invention ensures that defrosting is effectively ensured at low ambient temperatures, lower refrigerator temperature variations are obtained at ambient ambient temperatures, such as room temperature, which provides energy benefits, and achieves the required climate class at high ambient temperatures due to low turn-on values can be.

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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)

Description

Die Erfindung betrifft ein Kühl- und/oder Gefriergerät mit einem Kühlkreislauf, der wenigstens einen Verdampfer und wenigstens einen Kompressor umfaßt, mit einem im Bereich des Verdampfers angeordneten Temperaturfühler sowie mit einer Steuereinheit, die mit dem Temperaturfühler sowie mit dem Kompressor in Verbindung steht und die derart ausgeführt ist, dass sie den Kompressor einschaltet, wenn die mittels des Temperaturfühlers gemessene Temperatur einen oberen Grenzwert (Einschaltwert) übersteigt.The invention relates to a refrigerator and / or freezer with a cooling circuit comprising at least one evaporator and at least one compressor, with a temperature sensor arranged in the region of the evaporator and with a control unit, which is in communication with the temperature sensor and with the compressor and the is designed so that it turns on the compressor when the temperature measured by means of the temperature sensor exceeds an upper limit (switch-on).

Bekannte Kühlgeräte und Kühl-Gefrierkombinationen weisen einen Verdampfer auf, an dem ein Temperaturfühler angeordnet ist, der einen für die Verdampfertemperatur charakteristischen Temperatur-Istwert abgibt. Steigt die Verdampfertemperatur bei ausgeschaltetem Kompressor des Kühlkreislaufes aufgrund des Wärmeeinfalls an und übersteigt diese die 0°C-Grenze kommt es zu einem Abtauen des Verdampfers. Das Abtauen des Verdampfers ist erwünscht, um stets eine gute Effizienz des Verdampfers und somit eine gute Kühlleistung zu gewährleisten. Erreicht oder übersteigt der mittels des Verdampfer-Temperaturfühlers ermittelte Temperatur-Istwert einen bestimmten Grenzwert (im Folgenden als Einschaltwert bezeichnet), veranlasst eine Steuereinheit das Einschalten des Kompressors, woraufhin die Verdampfertemperatur absinkt. Bei Erreichen eines unteren Grenzwertes (im Folgenden als Ausschaltwert bezeichnet) wird der Kompressor wieder abgeschaltet. Aufgrund des Wärmeeinfalls kommt es erneut zu einer Erwärmung und somit zu einer Temperatursteigerung am Verdampfer-Temperaturfühler, der über die Steuereinheit erneut ein Einschalten des Kompressors veranlaßt, wenn der Einschaltwert wieder erreicht ist bzw. überschritten wird. Somit schwingt die Temperatur im Betrieb des Kühl- und/oder Gefriergerätes zwischen zwei Werten, wobei der sich ergebende Temperaturverlauf beispielsweise sinusförmig oder sägezahnförmig mit geraden oder gekrümmten Linien bzw. Flanken sein kann.Known refrigerators and fridge-freezers have an evaporator on which a temperature sensor is arranged, which emits a characteristic of the evaporator temperature actual temperature. If the evaporator temperature increases when the compressor of the refrigeration circuit is switched off due to the incidence of heat and if this exceeds the 0 ° C limit, the evaporator defrosts. The defrosting of the evaporator is desirable to always ensure a good efficiency of the evaporator and thus a good cooling performance. If the actual temperature value determined by means of the evaporator temperature sensor reaches or exceeds a certain limit value (referred to below as the switch-on value), causes a control unit to turn on the compressor, whereupon the evaporator temperature drops. When a lower limit value is reached (referred to below as the switch-off value), the compressor is switched off again. Due to the incidence of heat it comes again to a warming and thus to an increase in temperature at the evaporator temperature sensor, which again causes the control unit to turn on the compressor when the switch-on is reached again or exceeded. Thus, the temperature during operation of the refrigerator and / or freezer oscillates between two values, wherein the resulting temperature profile may be, for example, sinusoidal or sawtooth with straight or curved lines or flanks.

Um auch bei minimaler Umgebungstemperatur, das heißt geringem Wärmeeinfall von außen, und kältester Reglereinstellung des Gerätes stets eine sichere Abtauung des Verdampfers zu gewährleisten, wird der Einschaltwert des Verdampferfühlers entsprechend hoch festgelegt, das heißt der Grenzwert, bei dem der Kompressor wieder eingeschaltet wird, liegt vergleichsweise hoch. Damit wird sichergestellt, dass der Verdampfer eine ausreichende Zeitdauer einer Temperatur ausgesetzt ist, bei der ein Abtauen erfolgen kann.In order to always ensure a safe defrost of the evaporator even at minimum ambient temperature, ie low heat input from the outside, and coldest regulator setting of the device, the switch-on of the evaporator sensor is set correspondingly high, that is, the limit at which the compressor is turned on again, is comparatively high. This ensures that the evaporator is exposed for a sufficient amount of time to a temperature at which defrosting can occur.

Ein Nachteil dieser hohen Einstellung des Einschaltwertes besteht darin, dass sich dieser Wert bei mittleren Umgebungstemperaturen, beispielsweise bei 25 °C oder auch höheren Werten in der Weise auswirkt, dass vergleichsweise große zeitliche Temperaturschwankungen in dem zu kühlenden Raum entstehen, was aus energetischen Gründen nicht optimal ist.A disadvantage of this high setting of the switch-on value is that this value has an effect at medium ambient temperatures, for example at 25 ° C. or even higher values, in such a way that comparatively large temporal temperature fluctuations occur in the space to be cooled, which is not optimal for energetic reasons is.

Da die Angabetemperatur des Kühlteils aus Minimal- und Maximalwerten der Norm-Messstellen des zu kühlenden Raumes errechnet wird, beeinflusst der genannte Einschaltwert diese Angabetemperatur erheblich. Liegen sehr hohe Umgebungstemperaturen, beispielsweise von 38°C bis 43°C vor, kann dies dazu führen, dass aufgrund des vergleichsweise hohen Einschaltwertes der geforderte Minimalwert von 5°C des Kühlteils nicht mehr erreicht wird, was eine Eignung des Gerätes für bestimmte Einsatzbereiche ausschließen kann.Since the setting temperature of the refrigeration section is calculated from the minimum and maximum values of the standard measuring points of the room to be cooled, said switch-on value considerably influences this setting temperature. If very high ambient temperatures, for example from 38 ° C. to 43 ° C., may result that the required minimum value of 5 ° C. of the cooling part is no longer achieved due to the comparatively high switch-on value, which precludes suitability of the device for certain areas of use can.

Aus der Druckschrift EP 1 030 147 A1 ist ein Kühlgerät bekannt, dessen Kompressor bei Überschreiten eines Temperaturgrenzwertes eingeschaltet wird und bei Unterschreiten eines weiteren Temperaturgrenzwertes ausgeschaltet wird. Diese beiden Temperaturschaltwerte sind nicht fest vorgegeben, sondern werden in Abhängigkeit des Verhältnisses des Temperaturabfalls am Verdampfer bei eingeschaltetem Kompressor zum Anstieg der Temperatur bei ausgeschaltetem Kompressor verändert.From the publication EP 1 030 147 A1 a cooling device is known whose compressor is turned on when a temperature limit is exceeded and is turned off when falling below a further temperature limit. These two temperature switching values are not fixed, but are changed depending on the ratio of the temperature drop at the evaporator with the compressor on to increase the temperature when the compressor is switched off.

Die US 6,006,530 offenbart ein Kühlgerät, in dessen Innenraum ein Gebläse angeordnet ist, um die durch den Verdampfer gekühlte Kaltluft in das Kühlkompartiment einzubringen. Das Gebläse wird derart betrieben, dass dessen Drehgeschwindigkeit mit abnehmender Verdampfertemperatur angehoben wird.The US 6,006,530 discloses a refrigerator in the interior of which a fan is arranged to introduce the cold air cooled by the evaporator into the refrigeration compartment. The fan is operated so that its rotational speed is increased with decreasing evaporator temperature.

Es ist die Aufgabe der Erfindung, ein Kühl- und/oder Gefriergerät der eingangs genannten Art dahingehend weiterzubilden, dass das Kühlverhalten der Geräte verbessert wird.It is the object of the invention to develop a refrigerator and / or freezer of the type mentioned in such a way that the cooling behavior of the devices is improved.

Diese Aufgabe wird durch ein Kühl- und/oder Gefriergerät mit den Merkmalen des Anspruchs 1 gelöst. Danach ist vorgesehen, dass das Gerät einen Umgebungstemperaturfühler aufweist oder mit diesem in Verbindung steht, der die Umgebungstemperatur des Kühl- und/oder Gefriergerätes erfasst, und dass eine Einheit zur Änderung des Einschaltwertes vorgesehen ist, die mit dem Umgebungstemperaturfühler in Verbindung steht und die derart ausgeführt ist, dass bei höheren Umgebungstemperaturen ein geringerer Einschaltwert eingestellt oder ausgewählt wird als bei dem gegenüber geringeren Umgebungstemperaturen. Das Regelverhalten des Gerätes wird somit durch Einsatz eines Umgebungstemperaturfühlers und durch von der Umgebungstemperatur abhängige Einschaltwerte, das heißt Grenzwerte der Verdampfer-Temperatur verbessert, bei denen der Kompressor eingeschaltet wird.This object is achieved by a refrigerator and / or freezer with the features of claim 1. Thereafter, it is envisaged that the apparatus includes or is in communication with an ambient temperature sensor which senses the ambient temperature of the refrigerator and / or freezer, and that there is provided a unit for changing the ON value associated with the ambient temperature sensor and such is designed that at higher ambient temperatures, a lower switch-on value is set or selected as compared to lower ambient temperatures. The control behavior of the device is thus improved by the use of an ambient temperature sensor and by the ambient temperature dependent switch-on values, that is to say limit values of the evaporator temperature at which the compressor is switched on.

Da der Wärmeeinfall durch die Isolation bei hohen Umgebungstemperaturen wesentlichen höher ist als bei geringeren Temperaturen und somit die Abtauung wesentlich schneller erfolgt, kann der Einschaltwert des Verdampferfühlers, bei dem der Kompressor eingeschaltet wird, bei hohen Umgebungstemperaturen deutlich niedriger festgelegt werden. Denkbar ist beispielsweise, dass der Grenzwert, bei der die Steuereinheit das Einschalten des Kompressors veranlaßt bei geringen Umgebungstemperaturen bei +5°C und bei hohen Umgebungstemperaturen beispielsweise bei 0°C oder auch darunter liegt.Since the heat generated by the insulation at high ambient temperatures is substantially higher than at lower temperatures and thus the defrost is much faster, the turn-on of the evaporator sensor, in which the compressor is turned on, be set much lower at high ambient temperatures. It is conceivable, for example, that the limit at which the control unit causes the compressor to switch on is at low ambient temperatures at + 5 ° C. and at high ambient temperatures, for example at 0 ° C. or even lower.

Der Einsatz von Einschaltwerten von unter 0°C ist denkbar, da der Temperaturverlauf nach dem Einschalten des Kompressors nachschwingt, so dass es zu einem Temperaturanstieg über 0°C kommen kann, selbst wenn der Einschaltwert 0°C oder bei unter 0°C eingestellt ist.The use of switch-on values of less than 0 ° C is conceivable, as the temperature curve will reverberate after switching on the compressor so that a temperature rise above 0 ° C can occur, even if the switch-on value is 0 ° C or below 0 ° C ,

In weiterer Ausgestaltung der Erfindung ist die Einheit zur Änderung des Einschaltwertes derart ausgeführt, dass der Einschaltwert innerhalb vorgegebener Bereiche der Umgebungstemperatur nicht geändert wird und bei Erreichen oder Überschreiten einer oberen Bereichsgrenze verringert und bei Erreichen oder Überschreiten einer unteren Bereichsgrenze erhöht wird. Denkbar ist beispielsweise, dass ein, zwei, drei oder mehr als drei solcher Bereiche vorgesehen sind.In a further embodiment of the invention, the unit for changing the switch-on value is designed such that the switch-on value is not changed within predetermined ranges of the ambient temperature and is reduced when reaching or exceeding an upper range limit and increased when a lower range limit is reached or exceeded. It is conceivable, for example, that one, two, three or more than three such areas are provided.

Vorstellbar ist beispielsweise, dass die Steuereinheit ein Kennfeld aufweist, das bestimmte Umgebungstemperaturbereiche und diesem zugeordnete obere Grenzwerte, das heißt Einschaltwerte zum Einschalten des Kompressors aufweist. In diesem Fall prüft die Steuereinheit, in welchen Bereich die mittels des Verdampfer-Temperaturfühlers gemessene Temperatur fällt und ermittelt sodann den zugehörigen Einschaltwert.It is conceivable, for example, that the control unit has a characteristic map which has certain ambient temperature ranges and upper limit values assigned thereto, that is, switch-on values for switching on the compressor. In this case, the control unit checks in which area the temperature measured by means of the evaporator temperature sensor falls and then determines the associated switch-on value.

Als ein Beispiel kann genannt werden, dass bei geringen Umgebungstemperaturen bis 16°C ein hoher Einschaltwert, bei Umgebungstemperaturen ab 16°C bis 38°C ein mittlerer Einschaltwert und bei Umgebungstemperaturen ab 38°C ein geringer Einschaltwert eingestellt wird. Dabei handelt es sich selbstverständlich nur um ein Beispiel. Auch davon abweichende Bereich bzw. Bereichsgrenzen sind selbstverständlich denkbar.As an example it can be mentioned that at low ambient temperatures up to 16 ° C a high switch-on value is set, at ambient temperatures from 16 ° C to 38 ° C a medium switch-on value and at ambient temperatures from 38 ° C a low switch-on value. Of course this is just an example. Even deviating range or range limits are of course conceivable.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, dass die Einheit zur Änderung des Einschaltwertes derart ausgeführt ist, dass der Einschaltwert kontinuierlich mit der Änderung der Umgebungstemperatur geändert wird. Denkbar ist beispielsweise, dass anhand einer formelmäßigen Beziehung zwischen Umgebungstemperatur und Einschaltwert der korrekte Einschaltwert aufgrund des gemessenen Umgebungstemperaturwertes ermittelt wird.In a further embodiment of the invention, it is provided that the unit for changing the switch-on value is designed such that the switch-on value is changed continuously with the change of the ambient temperature. It is conceivable, for example, that the correct switch-on value based on the measured ambient temperature value is determined on the basis of a formula-related relationship between the ambient temperature and the switch-on value.

Die Änderung des oberen Grenzwertes bzw. des Einschaltwertes kann somit stufenweise oder kontinuierlich erfolgen.The change of the upper limit value or of the switch-on value can thus take place stepwise or continuously.

In weiterer Ausgestaltung der Erfindung ist die Einheit zur Änderung des Einschaltwertes Bestandteil der Steuereinheit. Selbstverständlich kann auch vorgesehen sein, dass die Einheit zur Änderung des Einschaltwertes und die Steuereinheit zwei voneinander getrennte Bauteile sind. Es kann sich somit um eine Baueinheit oder auch um verschiedene Einheiten handeln.In a further embodiment of the invention, the unit for changing the switch-on is part of the control unit. Of course, it can also be provided that the unit for changing the switch-on value and the control unit are two separate components. It can thus be a structural unit or even different units.

In weiterer Ausgestaltung der Erfindung ist ein Prüfmittel vorgesehen, das den Istwert der Temperatur des zu kühlenden Raumes, beispielsweise des Kühlfaches des Gerätes mit einem Sollwert vergleicht und das derart ausgeführt ist, dass es eine Korrektur des Einschaltwertes vornimmt, wenn der Temperatursollwert nicht oder nicht innerhalb einer bestimmten Zeitspanne erreicht oder unterschritten wird. Insbesondere bei hohen Umgebungstemperaturen, beispielsweise ab 38°C, kann der Fall eintreten, dass aufgrund des vergleichsweise großen Wärmeeinfalls von außen der Temperatursollwert des zu kühlenden Raumes des Gerätes nicht oder nicht innerhalb einer bestimmten Zeitspanne erreicht wird. Um dies zu verhindern, kann vorgesehen sein, dass das Prüfmittel eine Verringerung des Einschaltwertes vornimmt, so dass der Kompressor bereits bei geringeren Temperaturen eingeschaltet wird und somit früher eine Kühlleistung erzeugt wird. Auf diese Weise lässt sich ein Kompromiß zwischen dem Erreichen der gewünschten Temperatur des zu kühlenden Raumes und der Sicherstellung des Abtauens des Verdampfers erzielen.In a further embodiment of the invention, a test means is provided which compares the actual value of the temperature of the space to be cooled, for example, the cooling compartment of the device with a desired value and which is designed such that it makes a correction of the switch-on if the temperature setpoint is not or not within reached or fallen short of a certain period of time. In particular, at high ambient temperatures, for example from 38 ° C, the case may occur that due to the comparatively large heat from the outside of the temperature setpoint of the space to be cooled of the device is not or not achieved within a certain period of time. In order to prevent this, it can be provided that the test means makes a reduction of the switch-on value, so that the compressor is already switched on at lower temperatures and thus earlier a cooling power is generated. In this way, a compromise between achieving the desired temperature of the space to be cooled and ensuring the defrosting of the evaporator can be achieved.

Der Temperaturfühler kann unmittelbar am Verdampfer, vorzugsweise in einem am Verdampfer angeordneten Fühlerkanal oder auch im Bereich des Verdampfers angeordnet sein. Er mißt somit die Verdampfertemperatur bzw. die Temperatur der den Verdampfer unmittelbar umgebenden Atmosphäre.The temperature sensor can be arranged directly on the evaporator, preferably in a sensor channel arranged on the evaporator or also in the region of the evaporator. It thus measures the evaporator temperature or the temperature of the atmosphere immediately surrounding the evaporator.

Gemäß einer weiteren Ausgestaltung der Erfindung ist vorgesehen, dass die Steuereinheit derart ausgeführt ist, dass sie den Kompressor ausschaltet, wenn die mittels des Temperaturfühlers gemessene Temperatur einen unteren Grenzwert, d.h. einen Ausschaltwert unterschreitet und dass der Ausschaltwert bei einer Änderung des Einschaltwertes ebenfalls geändert wird. Es ist denkbar, dass bei einer Absenkung des Einschaltwertes, wie sie bei vergleichsweise hohen Umgebungstemperaturen sinnvoll ist, eine Abkühlung bis zu einem sehr geringen Ausschaltwert nicht unbedingt erforderlich ist. Somit kann vorgesehen sein, dass der Ausschaltwert angehoben wird, wenn der Einschaltwert verringert wird, so dass sich die Spanne zwischen den beiden Grenzwerten und somit auch die Temperaturschwankungen verringern.According to a further embodiment of the invention it is provided that the control unit is designed such that it switches off the compressor when the temperature measured by the temperature sensor falls below a lower limit, ie a switch-off and that the switch-off is also changed in a change of the switch-on. It is conceivable that at a subsidence of the switch-on value, which makes sense at comparatively high ambient temperatures, cooling down to a very low switch-off value is not absolutely necessary. It can therefore be provided that the switch-off value is raised when the switch-on value is reduced, so that the span between the two limit values and thus also the temperature fluctuations are reduced.

Weitere Einzelheiten und Vorteile der Erfindung werden anhand eines im Folgenden dargestellten Ausführungsbeispiels näher erläutert.Further details and advantages of the invention will be explained in more detail with reference to an embodiment shown below.

Das erfindungsgemäße Kühl- und/oder Gefriergerät weist eine Steuereinheit auf, die einerseits mit dem Kompressor des Kühlkreislaufes und andererseits mit einem Temperaturfühler in Verbindung steht, der in einem Fühlerkanal des Verdampfers des Gerätes aufgenommen ist. Mit der Steuereinheit steht des Weiteren ein Temperaturfühler in Verbindung, der die Umgebungstemperatur des Gerätes erfasst. Der Umgebungstemperaturfühler kann unmittelbar am Gerät oder auch davon beabstandet angeordnet sein.The refrigerator and / or freezer according to the invention has a control unit which is connected on the one hand to the compressor of the cooling circuit and on the other hand with a temperature sensor which is received in a sensor channel of the evaporator of the device. Furthermore, a temperature sensor is connected to the control unit, which detects the ambient temperature of the device. The ambient temperature sensor may be located directly on the device or even spaced therefrom.

Die Steuereinheit weist ein Kennfeld auf, in dem drei Bereiche der Umgebungstemperatur mit zugehörigen Einschaltwerten, d.h. mit den Werten der mittels des Verdampfer-Temperaturfühlers gemessenen Temperatur, bei denen der Kompressor des Gerätes eingeschaltet wird, verknüpft sind.The control unit has a map in which three ranges of ambient temperature with associated turn-on values, i. with the values of the measured by the evaporator temperature sensor temperature at which the compressor of the device is turned on, are linked.

Das Kennfeld ist derart ausgeführt, dass niedrigen Umgebungstemperaturen im Bereich unter 16 °C, beispielsweise zwischen 10°C und 16°C verhältnismäßig hohe Einschaltwerte, das heißt obere Grenzwerte von beispielsweise 5°C zugeordnet sind. Meldet der Verdampfer-Temperaturfühler diesen Temperaturwert, veranlaßt die Steuereinheit bei einer Umgebungstemperatur in dem genannten Bereich zwischen 10°C und 16°C das Einschalten des Kompressors. Solange sich die Temperatur im Bereich des Verdampfers oberhalb von 0°C befindet, kommt es zu einem Abtauen des Verdampfers.The map is designed such that low ambient temperatures in the range below 16 ° C, for example, between 10 ° C and 16 ° C relatively high switch-on, that is, upper limits of, for example, 5 ° C are assigned. If the evaporator temperature sensor reports this temperature value, the control unit causes the compressor to be switched on at an ambient temperature in the range between 10 ° C and 16 ° C. As long as the temperature in the area of the evaporator is above 0 ° C, defrosting of the evaporator occurs.

Das Kennfeld der Steuereinheit umfasst einen zweiten Bereich von beispielsweise über 16°C bis 38°C der Umgebungstemperatur, der ein geringerer Einschaltwert von beispielsweise von 2,5°C zugeordnet ist. Dies bedeutet, dass für den Fall, dass die Umgebungstemperatur in dem Bereich von über 16°C bis 38°C liegt ein Einschalten des Kompressors dann veranlaßt wird, wenn der Verdampfer-Temperaturfühler eine Temperatur von 2,5°C erfaßt. Dadurch wird die Spanne zwischen dem Ein- und Ausschaltwert verringert, so dass größere Temperaturschwankungen vermieden werden, was aus energetischen Gründen eine Verbesserung gegenüber vorbekannten Geräten darstellt.The map of the control unit comprises a second range, for example, above 16 ° C to 38 ° C of the ambient temperature, which is associated with a lower turn-on value, for example, of 2.5 ° C. This means that in the event that the ambient temperature is in the range above 16 ° C to 38 ° C, the compressor is switched on when the evaporator temperature sensor detects a temperature of 2.5 ° C. Thereby, the margin between the on and off value is reduced, so that larger temperature fluctuations are avoided, which represents an improvement over prior art devices for energy reasons.

Das Kennfeld der Steuereinheit weist einen dritten Bereich ab 38°C auf, beispielsweise 38°C bis 43°C, dem geringe Einschaltwerte beispielsweise 0°C zugeordnet sind. Wird bei einer derartig hohen Umgebungstemperatur seitens des Verdampfer-Temperaturfühlers der Wert 0°C gemessen, wird der Kompressor eingeschaltet. Das Einschalten des Kompressors und die damit verbundene Kühlung bei vergleichsweise geringen Temperaturen bringt den Vorteil mit sich, dass die Kühlraumtemperatur auch bei sehr hohen Umgebungstemperaturen eingehalten werden kann, so dass die geforderte Klimaklasse ST (subtropisch) oder T (tropisch) erreicht werden kann.The map of the control unit has a third range from 38 ° C, for example, 38 ° C to 43 ° C, the low turn-on, for example, 0 ° C are assigned. If the value of 0 ° C is measured by the evaporator temperature sensor at such a high ambient temperature, the compressor is switched on. The switching on of the compressor and the associated cooling at comparatively low temperatures has the advantage that the cold room temperature can be maintained even at very high ambient temperatures, so that the required climate class ST (subtropical) or T (tropical) can be achieved.

Die vorliegende Erfindung stellt in bevorzugter Ausgestaltung sicher, dass bei niedrigen Umgebungstemperaturen wirksam eine Abtauung gewährleistet wird, bei mittleren Umgebungstemperaturen, wie beispielsweise Raumtemperatur geringere Kühlraumtemperaturschwankungen erhalten werden, was energetische Vorteile mit sich bringt, und bei hohen Umgebungstemperaturen aufgrund der geringen Einschaltwerte die geforderte Klimaklasse erreicht werden kann.The present invention, in a preferred embodiment, ensures that defrosting is effectively ensured at low ambient temperatures, lower refrigerator temperature variations are obtained at ambient ambient temperatures, such as room temperature, which provides energy benefits, and achieves the required climate class at high ambient temperatures due to low turn-on values can be.

Claims (9)

  1. A refrigerator and/or freezer with a cooling circuit which comprises at least one evaporator and at least one compressor, with an evaporator temperature sensor arranged in the region of the evaporator and with a control unit which is connected with the evaporator temperature sensor and with the compressor and which is designed such that it switches the compressor on when the temperature measured by means of the evaporator temperature sensor exceeds an upper limit value (switch-on value),
    characterized in
    that an ambient temperature sensor is provided, which detects the ambient temperature of the refrigerator and/or freezer, and that a unit for changing the switch-on value is provided, which is connected with the ambient temperature sensor and is designed such that at higher ambient temperatures a lower switch-on value is set or selected than at comparatively lower ambient temperatures.
  2. The refrigerator and/or freezer according to claim 1, characterized in that the unit for changing the switch-on value is designed such that the switch-on value is not changed within specified ranges of the ambient temperature and upon reaching or exceeding an upper range limit is lowered and upon reaching or exceeding a lower range limit is increased.
  3. The refrigerator and/or freezer according to claim 2, characterized in that two, three or more than three of such ranges are provided.
  4. The refrigerator and/or freezer according to any of claims 2 or 3, characterized in that at low ambient temperatures down to 16 °C a high switch-on value, at ambient temperatures from 16 °C to 38 °C a medium switch-on value lying below the high switch-on value, and at ambient temperatures from 38 °C a low switch-on value lying below the medium switch-on value is set.
  5. The refrigerator and/or freezer according to claim 1, characterized in that the unit for changing the switch-on value is designed such that the switch-on value is changed continuously with the change of the ambient temperature.
  6. The refrigerator and/or freezer according to any of the preceding claims, characterized in that the unit for changing the switch-on value is part of the control unit or is designed separate from the same.
  7. The refrigerator and/or freezer according to any of the preceding claims, characterized in that a testing means is provided, which compares the actual value of the temperature of the space to be cooled of the appliance with a temperature setpoint and which is designed such that it performs a correction of the switch-on value, when the temperature setpoint is not reached or fallen short of or not reached or fallen short of within a certain time interval.
  8. The refrigerator and/or freezer according to any of the preceding claims, characterized in that the temperature sensor arranged in the region of the evaporator is arranged directly at the evaporator, preferably in a sensor channel arranged at the evaporator, or in the vicinity of the evaporator.
  9. The refrigerator and/or freezer according to any of the preceding claims, characterized in that the control unit is designed such that it switches the compressor off, when the temperature measured by means of the temperature sensor falls below a lower limit value (switch-off value), and that the switch-off value likewise is changed with a change of the switch-on value.
EP20060013973 2005-07-08 2006-07-05 Refrigerator and/or freezing apparatus Expired - Fee Related EP1742001B1 (en)

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DE202005010779 2005-07-08
DE202005012456U DE202005012456U1 (en) 2005-07-08 2005-08-08 Fridge and / or freezer

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EP1742001A3 EP1742001A3 (en) 2011-09-21
EP1742001B1 true EP1742001B1 (en) 2014-05-28

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DE202008012411U1 (en) * 2008-08-14 2009-12-17 Liebherr-Hausgeräte Ochsenhausen GmbH Fridge and / or freezer
DE102012007826A1 (en) * 2011-05-11 2012-11-15 Liebherr-Hausgeräte Ochsenhausen GmbH Fridge and / or freezer
CN114608258A (en) * 2022-03-11 2022-06-10 长虹美菱股份有限公司 Defrosting control method of refrigerator refrigerating system based on electronic expansion valve

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US5524444A (en) * 1994-12-16 1996-06-11 Robertshaw Controls Company Temperature control of an appliance using ambient air temperature determination
DE19510268B4 (en) * 1995-03-21 2004-12-09 Liebherr-Hausgeräte Ochsenhausen GmbH Refrigerator with a normal cold room and a freezer compartment and cooling process
KR19980083487A (en) * 1997-05-15 1998-12-05 윤종용 Refrigeration control device and method
DE19828061C1 (en) * 1998-06-24 1999-12-23 Danfoss As Method for controlling the temperature of a refrigerator and temperature control device for a refrigerator
DE69916231D1 (en) * 1999-02-19 2004-05-13 Ranco Inc Of Delaware Wilmingt Regulator and method for controlling the temperature in a refrigerator
BR8200405U (en) * 2002-03-08 2003-04-08 Quantum Ind E Com De Equipamen Electronic controller for refrigerator

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ES2471405T3 (en) 2014-06-26
EP1742001A3 (en) 2011-09-21
DE202005012456U1 (en) 2006-11-16

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