EP1327127A1 - Refrigerating device with a temperature sensor - Google Patents

Refrigerating device with a temperature sensor

Info

Publication number
EP1327127A1
EP1327127A1 EP01974320A EP01974320A EP1327127A1 EP 1327127 A1 EP1327127 A1 EP 1327127A1 EP 01974320 A EP01974320 A EP 01974320A EP 01974320 A EP01974320 A EP 01974320A EP 1327127 A1 EP1327127 A1 EP 1327127A1
Authority
EP
European Patent Office
Prior art keywords
temperature
infrared sensor
interior
sensor
refrigerating
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Withdrawn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
EP01974320A
Other languages
German (de)
French (fr)
Inventor
Alexander Walter
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens 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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP1327127A1 publication Critical patent/EP1327127A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/04—Casings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/04—Casings
    • G01J5/041—Mountings in enclosures or in a particular environment
    • 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
    • F25D2700/12—Sensors measuring the inside temperature
    • 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
    • F25D29/005—Mounting of control devices

Definitions

  • the invention relates to a refrigerator with a temperature sensor for detecting an operating temperature of the refrigerator.
  • temperature-dependent resistors are conventionally used in refrigeration devices such as refrigerators, freezers or combination devices, which are connected via a wiring harness to a control circuit for regulating the cooling operation.
  • Wiring is required to route the measurement signal from the temperature-sensitive resistor to the control circuit. This wiring is sensitive to interference from electromagnetic interference.
  • the detected temperature is not necessarily that of the location to be monitored, but the temperature that arises in the temperature-sensitive resistor. In order to avoid falsification of the temperature measurement, it is therefore necessary to insulate it well against the uncooled outside area.
  • the object of the present invention is to provide a refrigeration device with a temperature sensor, in which the assembly of the temperature sensor is simplified, in which the sensitivity of the measurement signal of the temperature sensor to electromagnetic interference is reduced, and in which a failure due to thermal loads is excluded.
  • the operating temperature to be detected with the infrared sensor of this refrigerator can be an interior temperature of the refrigerator.
  • a black body can be provided in the interior of the refrigerator, with which the infrared sensor is in eye contact.
  • the temperature of an evaporator of the refrigerator can also be used as the operating temperature to be measured.
  • the infrared sensor is preferably in eye contact with a surface of the evaporator facing the interior of the refrigeration device. This allows the temperature of this surface of the evaporator, which is relevant for the cooling of the interior, to be measured directly, instead of the temperature of the rear, which is easier to achieve when measuring with a temperature-sensitive resistor, but which may be falsified by the influx of heat from the outside.
  • the infrared sensor does not have to be arranged in direct contact with the object whose temperature it is to measure, it is possible to arrange it in the immediate vicinity of the control circuit, in particular on a common circuit board with the control circuit; the control circuit and the temperature sensor can be prefabricated as a single unit and can be installed together in the refrigeration device according to the invention during assembly.
  • the temperature of the infrared sensor is not decisive for the measurement result, it can be installed in an uncooled outside area of the refrigerator. In such a case, it is desirable for it to be separated from a measurement area to be monitored by an infrared-transmissive window which blocks an unimpeded flow of heat into the interior of the refrigerator. If the distance between the infrared sensor and the measuring surface to be monitored by it is large, it is desirable that a lens is provided between the two for imaging the measuring surface onto a radiation-sensitive surface of the sensor. This lens can in particular form the window mentioned above at the same time.
  • FIG. 1 shows a schematic section through part of the housing of a refrigerator according to the invention in accordance with a first embodiment of the invention
  • Fig. 2 shows an analog section according to a second embodiment of the invention.
  • FIG. 1 shows a highly schematic section through the upper front corner of the housing of a refrigeration device according to the invention.
  • the refrigerator comprises a thermally insulating housing, of which part of an upper side 1 and a front side 2 with a door 3 mounted thereon can be seen in FIG. 1.
  • a panel 4 is mounted on the front side 2, which can be a simple plastic molded part without its own significant thermal insulation effect.
  • an infrared sensor 7 In the space enclosed by the panel 4 and the front side 2, a control circuit and, on its surface facing the interior 6 of the refrigerator, an infrared sensor 7 are mounted on a circuit board 5.
  • Such an infrared sensor can detect the intensity of infrared radiation in different spectral ranges and, based on the intensity distribution, allow conclusions to be drawn about the temperature of the radiation source.
  • This infrared sensor can e.g. B. be of a similar type to those z. B. in so-called "ear thermometers" for body temperature measurement.
  • the infrared radiation from inside a refrigerator is significantly weaker and on average longer than that of a human body, on the other hand, the requirements for measurement accuracy when controlling a refrigerator are significantly lower than in the Body temperature measurement, so that such an infrared sensor is also considered suitable for regulating a refrigerator.
  • the attachment of the board 5 with the control circuit in the front area of the refrigerator has the advantage that it is possible to mount on the board 5 display elements such as a light-emitting diode 8, which are visible to a user through a window 9 of the panel 4, so that who can easily convince the proper functioning of the refrigerator at any time.
  • regulators e.g. B. for setting a target temperature of the interior, can be mounted directly on the board 5 and are still easily accessible to a user.
  • the infrared sensor 7 is opposite a window 10 made of an infrared-permeable material which is let into the front side 2 and through which the characteristic heat radiation of a black body 11 mounted in the interior 6 can fall onto the radiation-sensitive surface of the infrared sensor 7 essentially unhindered.
  • this black body 11 With the help of this black body 11, it is possible to specifically measure the temperature in a critical area of the interior 6. Especially the front upper area of the interior 6, where the black body 11 is shown in the figure, is such an area, since here due to the heat flow into the interior 6, which is strongest along the edges of the door 3, in the Usually set the highest temperatures in the interior.
  • the black body 11 so that the infrared sensor 7 has a "free view" of the interior 6 through the window 10.
  • This interior 6 also has the radiation characteristics of a black body in thermal equilibrium, so that if the black body 1 is left out, a temperature can be measured with the infrared sensor 7, which is averaged over the entire field of view of the infrared sensor 7.
  • the result of such an arrangement is the peculiarity that the measured values detected by the infrared sensor 7 can be "falsified", if there is refrigerated goods in its field of vision that has only recently been loaded into the refrigerator and has not yet reached its internal temperature.
  • the infrared radiation power of a body increases much more than linearly with its temperature.
  • Such “warm” refrigerated goods can therefore be sure of their cold surroundings.
  • the temperature detected by the infrared sensor is higher than an arithmetic mean of the temperature formed taking into account the “warm” refrigerated goods.
  • Such adulteration may be desirable here, however, because it makes it possible to regulate the cooling capacity of the refrigeration device well before the heat introduced with the new refrigerated goods has spread inside. In this way, heating of the interior by newly introduced, relatively warm refrigerated goods is reliably prevented without any complex circuitry measures being necessary for this.
  • FIG. 2 shows a section analogous to that of FIG. 1 through a further developed variant of a refrigeration device according to the invention.
  • FIG. 2 also shows a part of the rear wall 13 of its housing and an evaporator plate 14 arranged thereon.
  • the window 10 is replaced by a lens 15 which consists of the same material as the window 10 and can be embedded in a corresponding manner in the front 2 of the housing.
  • the lens 15 has the effect that the field of view 16 of the lens, which is delimited by broken lines in FIG. 2, is restricted in comparison to the embodiment from FIG. 1 and only covers a limited area 17 of the evaporator plate 14. With this arrangement, precise monitoring of the temperature of the evaporator plate 14 is possible across the interior 6.
  • the infrared sensor 7 Since the infrared sensor 7 is not exposed to the temperature fluctuations in the evaporator plate itself, its lifespan is not impaired thereby, and malfunctions in the operation of the refrigeration device are avoided.

Abstract

A refrigerating device is equipped with a temperature sensor in the form of an infrared sensor (7), for detecting an operating temperature of the device. Said infrared sensor (7) is located on a board (5) in a non-refrigerated area of the refrigerating device, together with a control circuit.

Description

Kältegerät mit Temperatursensor Refrigeration device with temperature sensor
Die Erfindung betrifft ein Kältegerät mit einem Temperatursensor zum Erfassen einer Betriebstemperatur des Kältegeräts.The invention relates to a refrigerator with a temperature sensor for detecting an operating temperature of the refrigerator.
Für die Erfassung einer Betriebstemperatur wie etwa einer Innenraum-Temperatur oder der Temperatur eines Verdampfers werden bei Kältegeräten wie etwa Kühlschränken, Gefrierschränken oder Kombinationsgeräten herkömmlicherweise temperaturabhängige Widerstände eingesetzt, die über einen Kabelbaum mit einer Steuerschaltung zur Rege- lung des Kühlbetriebs verbunden sind.In order to record an operating temperature such as an interior temperature or the temperature of an evaporator, temperature-dependent resistors are conventionally used in refrigeration devices such as refrigerators, freezers or combination devices, which are connected via a wiring harness to a control circuit for regulating the cooling operation.
Diese seit langem übliche Technik weist eine Reihe von Nachteilen auf. Zum einen ist es notwendig, den temperaturempfindlichen Widerstand unmittelbar an dem Ort anzubringen, dessen Temperatur erfaßt werden soll. Die Steuerschaltung hingegen, die anhand der vom Temperatursensor erfassten Temperatur den Betrieb einer Kältemaschine regelt, befindet sich jedoch üblicherweise in einem ungekühltem Außenbereich des Kältegeräts, um Funktionsstörungen durch Kondensatbildung an der Steuerschaltung zu vermeiden. Die dadurch erzwungene örtliche Trennung von Steuerschaltung und Temperatursensor macht dessen Anbringung umständlich und dementsprechend kostspielig.This technique, which has long been common, has a number of disadvantages. On the one hand, it is necessary to attach the temperature-sensitive resistor directly to the location whose temperature is to be recorded. The control circuit, on the other hand, which regulates the operation of a refrigeration machine on the basis of the temperature detected by the temperature sensor, is however usually located in an uncooled outside area of the refrigeration device in order to avoid malfunctions due to the formation of condensate on the control circuit. The resulting local separation of the control circuit and the temperature sensor makes it difficult to install and accordingly expensive.
Es ist eine Verdrahtung erforderlich, um das Messsignal des temperatürempfindlichen Widerstandes zur Steuerschaltung zu führen. Diese Verdrahtung ist empfindlich gegen Störungen durch elektromagnetische Einstreuungen. Außerdem ist die erfasste Temperatur nicht zwangsläufig die des zu überwachenden Ortes, sondern die Temperatur, die sich in dem temperaturempfindlichen Widerstand einstellt. Um Verfälschungen der Temperaturmessung zu vermeiden, ist es daher notwendig, diesen gut gegen den ungekuhlten Außenbereich zu isolieren.Wiring is required to route the measurement signal from the temperature-sensitive resistor to the control circuit. This wiring is sensitive to interference from electromagnetic interference. In addition, the detected temperature is not necessarily that of the location to be monitored, but the temperature that arises in the temperature-sensitive resistor. In order to avoid falsification of the temperature measurement, it is therefore necessary to insulate it well against the uncooled outside area.
Insbesondere wenn ein solcher herkömmlicher Temperatursensor zur Überwachung der Temperatur eines Verdampfers eingesetzt wird, führen die starken Temperaturschwankungen, denen ein solcher Sensor ausgesetzt ist, und die von -40°C bei normalem Kühlbetrieb zu bis zu +8°C beim Abtaubetrieb erreichen können, zu erheblichen mechani- sehen Belastungen der Isolation des temperaturempfindlichen Widerstands, die Ausfälle zur Folge haben können.Especially when such a conventional temperature sensor is used to monitor the temperature of an evaporator, the strong temperature fluctuations to which such a sensor is exposed and which can reach from -40 ° C. in normal cooling operation to up to + 8 ° C. in defrost operation considerable mechanical see loads on the insulation of the temperature-sensitive resistor, which can lead to failures.
Aufgabe der vorliegenden Erfindung ist, ein Kältegerät mit einem Temperatursensor anzugeben, bei dem die Montage des Temperatursensors vereinfacht ist, bei dem die Emp- findlichkeit des Messsignals des Temperatursensors gegen elektromagnetische Einstreuungen verringert ist, und bei dem ein Ausfall infolge thermischer Belastungen ausgeschlossen ist.The object of the present invention is to provide a refrigeration device with a temperature sensor, in which the assembly of the temperature sensor is simplified, in which the sensitivity of the measurement signal of the temperature sensor to electromagnetic interference is reduced, and in which a failure due to thermal loads is excluded.
Die Aufgabe wird gelöst durch ein Kältegerät nach Anspruch 1.The object is achieved by a refrigeration device according to claim 1.
Die mit dem Infrarotsensor dieses Kältegeräts zu erfassende Betriebstemperatur kann eine Innenraumtemperatur des Kältegeräts sein. In diesem Fall kann im Innenraum des Kältegeräts ein schwarzer Körper vorgesehen werden, mit dem der Infrarotsensor in Blickkontakt steht.The operating temperature to be detected with the infrared sensor of this refrigerator can be an interior temperature of the refrigerator. In this case, a black body can be provided in the interior of the refrigerator, with which the infrared sensor is in eye contact.
Als zu messende Betriebstemperatur kommt auch die Temperatur eines Verdampfers des Kältegeräts in Frage. In diesem Fall steht der Infrarotsensor vorzugsweise mit einer dem Innenraum des Kältegeräts zugewandten Oberfläche des Verdampfers in Blickkontakt. Dies erlaubt es direkt die Temperatur dieser für die Kühlung des Innenraums relevanten Oberfläche des Verdampfers zu messen, anstelle der bei Messung mit einem temperaturempfindlichen Widerstand leichter erreichbaren, aber eventuell durch Wärmezustrom von außen verfälschten Temperatur der Rückseite. Da der Infrarotsensor nicht in unmittelbarem Kontakt mit dem Gegenstand angeordnet sein muß, dessen Temperatur er messen soll, ist es möglich, ihn in unmittelbarer Nachbarschaft zur Steuerschaltung, insbesondere auf einer gemeinsamen Platine mit der Steuerschaltung anzuordnen; so können die Steuerschaltung und der Temperatursensor als eine Baueinheit vorgefertigt und bei der Montage gemeinsam in das erfindungsgemäße Kältegerät eingebaut werden.The temperature of an evaporator of the refrigerator can also be used as the operating temperature to be measured. In this case, the infrared sensor is preferably in eye contact with a surface of the evaporator facing the interior of the refrigeration device. This allows the temperature of this surface of the evaporator, which is relevant for the cooling of the interior, to be measured directly, instead of the temperature of the rear, which is easier to achieve when measuring with a temperature-sensitive resistor, but which may be falsified by the influx of heat from the outside. Since the infrared sensor does not have to be arranged in direct contact with the object whose temperature it is to measure, it is possible to arrange it in the immediate vicinity of the control circuit, in particular on a common circuit board with the control circuit; the control circuit and the temperature sensor can be prefabricated as a single unit and can be installed together in the refrigeration device according to the invention during assembly.
Da die Temperatur des Infrarotsensors für das Meßergebnis nicht ausschlaggebend ist, kann er in einem ungekuhlten Außenbereich des Kältegeräts angebracht sein. In einem solchen Fall ist es wünschenswert, daß er von einer zu überwachenden Meßfläche durch ein Infrarotdurchlässiges Fenster getrennt ist, das einen ungehinderten Zustrom von Wärme in den Innenraum des Kältegeräts blockiert. Wenn die Entfernung zwischen dem Infrarotsensor und der von ihm zu überwachenden Meßfläche groß ist, ist es wünschenswert, daß zwischen beiden eine Linse zum Abbilden der Meßfläche auf eine strahlungsempfindliche Fläche des Sensors vorgesehen ist. Dabei kann diese Linse insbesondere gleichzeitig das oben erwähnte Fenster bilden.Since the temperature of the infrared sensor is not decisive for the measurement result, it can be installed in an uncooled outside area of the refrigerator. In such a case, it is desirable for it to be separated from a measurement area to be monitored by an infrared-transmissive window which blocks an unimpeded flow of heat into the interior of the refrigerator. If the distance between the infrared sensor and the measuring surface to be monitored by it is large, it is desirable that a lens is provided between the two for imaging the measuring surface onto a radiation-sensitive surface of the sensor. This lens can in particular form the window mentioned above at the same time.
Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen mit Bezug auf die beigefügten Figuren. Es zeigen:Further features and advantages of the invention result from the following description of exemplary embodiments with reference to the attached figures. Show it:
Fig. 1 einen schematisierten Schnitt durch einen Teil des Gehäuses eines erfindungs- gemäßen Kältegeräts gemäß einer ersten Ausgestaltung der Erfindung; und1 shows a schematic section through part of the housing of a refrigerator according to the invention in accordance with a first embodiment of the invention; and
Fig. 2 einen analogen Schnitt gemäß einer zweiten Ausgestaltung der Erfindung.Fig. 2 shows an analog section according to a second embodiment of the invention.
Fig. 1 zeigt einen stark schematisierten Schnitt durch die obere vordere Ecke des Gehäu- ses eines erfindungsgemäßen Kältegeräts. Das Kältegerät umfaßt ein thermisch isolierendes Gehäuse, von dem in der Fig. 1 ein Teil einer Oberseite 1 und einer Frontseite 2 mit daran montierter Tür 3 zu sehen ist.1 shows a highly schematic section through the upper front corner of the housing of a refrigeration device according to the invention. The refrigerator comprises a thermally insulating housing, of which part of an upper side 1 and a front side 2 with a door 3 mounted thereon can be seen in FIG. 1.
Oberhalb der Tür 3 ist an der Frontseite 2 eine Blende 4 montiert, bei der es sich um ein einfaches Kunststoff-Formteil ohne wesentliche eigene thermische Isolationswirkung handeln kann.Above the door 3, a panel 4 is mounted on the front side 2, which can be a simple plastic molded part without its own significant thermal insulation effect.
In dem von der Blende 4 und der Frontseite 2 umschlossenen Raum ist auf einer Platine 5 eine Steuerschaltung und, an ihrer dem Innenraum 6 des Kältegeräts zugewandten Ober- fläche, ein Infrarotsensor 7 montiert. Ein solcher Infrarotsensor kann die Intensität von Infrarotstrahlung in verschiedenen Spektralbereichen erfassen und anhand der Intensitätsverteilung einen Rückschluß auf die Temperatur der Strahlungsquelle zulassen. Dieser Infrarotsensor kann z. B. vom einem ähnlichen Typ sein wie jene, die z. B. in sogenannten „Ohrthermometern" für die Körpertemperaturmessung eingesetzt werden. Zwar ist die Infrarotstrahlung aus dem Innern eines Kältegeräts deutlich schwächer und im Mittel langwelliger als die eines menschlichen Körpers, andererseits sind die Anforderungen an die Messgenauigkeit bei der Regelung eines Kältegeräts deutlich niedriger als bei der Körpertemperaturmessung, so dass ein derartiger Infrarotsensor auch für Regelung eines Kältegeräts für geeignet angesehen wird.In the space enclosed by the panel 4 and the front side 2, a control circuit and, on its surface facing the interior 6 of the refrigerator, an infrared sensor 7 are mounted on a circuit board 5. Such an infrared sensor can detect the intensity of infrared radiation in different spectral ranges and, based on the intensity distribution, allow conclusions to be drawn about the temperature of the radiation source. This infrared sensor can e.g. B. be of a similar type to those z. B. in so-called "ear thermometers" for body temperature measurement. Although the infrared radiation from inside a refrigerator is significantly weaker and on average longer than that of a human body, on the other hand, the requirements for measurement accuracy when controlling a refrigerator are significantly lower than in the Body temperature measurement, so that such an infrared sensor is also considered suitable for regulating a refrigerator.
Die Anbringung der Platine 5 mit der Steuerschaltung im Frontbereich des Kältegeräts bringt den Vorteil, daß es möglich ist, auf der Platine 5 Anzeigeelemente wie etwa eine Leuchtdiode 8 anzubringen, die durch ein Fenster 9 der Blende 4 für einen Benutzer sichtbar sind, so daß sich dieser jeder Zeit leicht vom ordnungsgemäßen Funktionieren des Kältegeräts überzeugen kann. Auch Regler, z. B. zum Einstellen einer Solltemperatur des Innenraums, können so direkt auf der Platine 5 montiert werden und sind für einen Benutzer dennoch gut zugänglich.The attachment of the board 5 with the control circuit in the front area of the refrigerator has the advantage that it is possible to mount on the board 5 display elements such as a light-emitting diode 8, which are visible to a user through a window 9 of the panel 4, so that who can easily convince the proper functioning of the refrigerator at any time. Also regulators, e.g. B. for setting a target temperature of the interior, can be mounted directly on the board 5 and are still easily accessible to a user.
Der Infrarotsensor 7 liegt einem in die Frontseite 2 eingelassenen Fenster 10 aus einem Infrarot durchlässigen Material gegenüber, durch das die charakteristische Wärmestrahlung eines in dem Innenraum 6 angebrachten Schwarzen Körpers 11 im wesentlichen ungehindert auf die strahlungsempfindliche Oberfläche des Infrarotsensors 7 fallen kann.The infrared sensor 7 is opposite a window 10 made of an infrared-permeable material which is let into the front side 2 and through which the characteristic heat radiation of a black body 11 mounted in the interior 6 can fall onto the radiation-sensitive surface of the infrared sensor 7 essentially unhindered.
Mit Hilfe dieses Schwarzen Körpers 11 ist es möglich, gezielt die Temperatur in einem kritischen Bereich des Innenraums 6 zu messen. Gerade der vordere obere Bereich des Innenraums 6, wo in der Fig. der schwarze Körper 11 eingezeichnet ist, ist ein solcher Bereich, da sich hier infolge des Wärmezustroms in den Innenraum 6, der entlang der Ränder der Tür 3 am stärksten ist, in der Regel die höchsten Temperaturen des Innenraums einstellen.With the help of this black body 11, it is possible to specifically measure the temperature in a critical area of the interior 6. Especially the front upper area of the interior 6, where the black body 11 is shown in the figure, is such an area, since here due to the heat flow into the interior 6, which is strongest along the edges of the door 3, in the Usually set the highest temperatures in the interior.
Es ist jedoch auch möglich, den Schwarzen Körper 11 fortzulassen, so daß der Infrarotsensor 7 durch das Fenster 10 gewissermaßen „freien Blick" in den Innenraum 6 hat. Die- ser Innenraum 6 hat im thermischen Gleichgewicht ebenfalls die Strahlungscharakteristik eines Schwarzen Körpers; so daß bei Weglassen des Schwarzen Körpers 1 mit dem Infrarotsensor 7 eine Temperatur gemessen werden kann, die über das gesamte Blickfeld des Infrarotsensors 7 gemittelt ist. Bei einer solchen Anordnung ergibt sich die Besonderheit, daß die von dem Infrarotsensor 7 erfaßten Meßwerte „verfälscht" sein können, wenn sich in dessen Blickfeld Kühlgut befindet, das erst vor kurzem in das Kältegerät geladen worden ist und dessen Innentemperatur noch nicht angenommen hat. Die Infrarot- Strahlungsleistung eines Körpers nimmt nämlich wesentlich stärker als linear mit seiner Temperatur zu. Derartiges „warmes" Kühlgut kann daher seine kalte Umgebung gewis- sermaßen „überstrahlen". Die von dem Infrarotsensor erfasste Temperatur liegt in einem solchen Fall höher als ein unter Berücksichtigung des „warmen" Kühlguts gebildeter a- rithmetischer Mittelwert der Temperatur. Eine solche Verfälschung kann hier jedoch durchaus erwünscht sein, weil sie es ermöglicht, die Kühlleistung des Kältegeräts hoch zu regeln, noch bevor sich die mit dem neuen Kühlgut eingetragene Wärme im Innenraum ausgebreitet hat. Auf diese Weise wird eine Erwärmung des Innenraums durch neu eingebrachtes, relativ warmes Kühlgut zuverlässig verhindert, ohne daß hierfür irgendwelche aufwendigen schaltungstechnischen Maßnahmen erforderlich wären.However, it is also possible to omit the black body 11 so that the infrared sensor 7 has a "free view" of the interior 6 through the window 10. This interior 6 also has the radiation characteristics of a black body in thermal equilibrium, so that if the black body 1 is left out, a temperature can be measured with the infrared sensor 7, which is averaged over the entire field of view of the infrared sensor 7. The result of such an arrangement is the peculiarity that the measured values detected by the infrared sensor 7 can be "falsified", if there is refrigerated goods in its field of vision that has only recently been loaded into the refrigerator and has not yet reached its internal temperature. The infrared radiation power of a body increases much more than linearly with its temperature. Such “warm” refrigerated goods can therefore be sure of their cold surroundings. In such a case, the temperature detected by the infrared sensor is higher than an arithmetic mean of the temperature formed taking into account the “warm” refrigerated goods. Such adulteration may be desirable here, however, because it makes it possible to regulate the cooling capacity of the refrigeration device well before the heat introduced with the new refrigerated goods has spread inside. In this way, heating of the interior by newly introduced, relatively warm refrigerated goods is reliably prevented without any complex circuitry measures being necessary for this.
Fig. 2 zeigt einen Schnitt analog dem der Fig. 1 durch eine weiterentwickelte Variante eines erfindungsgemäßen Kältegeräts. Zusätzlich zu den bereits in Fig. 1 gezeigten und oben beschriebenen Elementen des Kältegeräts zeigt Fig. 2 auch einen Teil der Rückwand 13 von dessen Gehäuse sowie einer daran angeordneten Verdampferplatte 14. Das Fenster 10 ist bei dieser Variante durch eine Linse 15 ersetzt, die aus dem gleichen Material wie das Fenster 10 besteht und in entsprechender Weise in die Frontseite 2 des Ge- häuses eingelassen sein kann.FIG. 2 shows a section analogous to that of FIG. 1 through a further developed variant of a refrigeration device according to the invention. In addition to the elements of the refrigeration device already shown in FIG. 1 and described above, FIG. 2 also shows a part of the rear wall 13 of its housing and an evaporator plate 14 arranged thereon. In this variant, the window 10 is replaced by a lens 15 which consists of the same material as the window 10 and can be embedded in a corresponding manner in the front 2 of the housing.
Die Linse 15 hat die Wirkung, daß das in der Fig. 2 durch gestrichelte Linien begrenzte Blickfeld 16 der Linse im Vergleich zu der Ausgestaltung aus Fig. 1 eingeschränkt ist und lediglich einen begrenzten Bereich 17 der Verdampferplatte 14 erfaßt. Mit dieser Anord- nung ist quer durch den Innenraum 6 eine genaue Überwachung der Temperatur der Verdampferplatte 14 möglich.The lens 15 has the effect that the field of view 16 of the lens, which is delimited by broken lines in FIG. 2, is restricted in comparison to the embodiment from FIG. 1 and only covers a limited area 17 of the evaporator plate 14. With this arrangement, precise monitoring of the temperature of the evaporator plate 14 is possible across the interior 6.
Da der Infrarotsensor 7 den Temperaturschwankungen in der Verdampferplatte selbst nicht ausgesetzt ist, ist seine Lebensdauer hierdurch nicht beeinträchtigt, und Störungen im Betrieb des Kältegeräts werden vermieden.Since the infrared sensor 7 is not exposed to the temperature fluctuations in the evaporator plate itself, its lifespan is not impaired thereby, and malfunctions in the operation of the refrigeration device are avoided.
Diverse Weiterentwicklungen der oben beschriebenen Ausführungsbeispiele sind im Rahmen der vorliegenden Erfindung möglich. So ist es z.B. denkbar, eine Mehrzahl von Infrarotsensoren an der Platine 5 anzubringen, die jeweils über ein eigenes Fenster ein Blickfeld im Innenraum 6 des Kältegeräts überwachen. Eine solche differenzierte Temperaturüberwachung ermöglicht es der Steuerschaltung z.B., neu eingebrachtes Kühlgurt, das nur lokal zu erhöhten Temperaturmeßwerten führt, von einer allgemeinen Funktions- Störung zu Unterscheiden, bei der infolge eines Ausfalls der Kühlung die Temperatur des gesamten Innenraums 6 ansteigt. Various further developments of the exemplary embodiments described above are possible within the scope of the present invention. For example, it is conceivable to attach a plurality of infrared sensors to the circuit board 5, each of which monitors a field of view in the interior 6 of the refrigerator via a separate window. Such differentiated temperature monitoring enables the control circuit, for example, newly introduced cooling belt, which only leads locally to increased temperature measurements, from a general functional Disturbance to distinguish, in which the temperature of the entire interior 6 rises due to a failure of the cooling.

Claims

Patentansprüche claims
1. Kältegerät mit einem Temperatursensor zur Erfassung einer Betriebstemperatur des Gerätes, dadurch gekennzeichnet, dass der Temperatursensor ein Infrarot- sensor (7) ist.1. Refrigeration device with a temperature sensor for detecting an operating temperature of the device, characterized in that the temperature sensor is an infrared sensor (7).
2. Kältegerät nach Anspruch 1 , dadurch gekennzeichnet, dass die Betriebstemperatur die Temperatur eines Innenraums (6) des Kältegeräts ist.2. Refrigeration device according to claim 1, characterized in that the operating temperature is the temperature of an interior (6) of the refrigeration device.
3. Kältegerät nach Anspruch 2, dadurch gekennzeichnet, dass der Infrarotsensor3. Refrigerating appliance according to claim 2, characterized in that the infrared sensor
(7) mit einem in dem Innenraum (6) angeordneten Schwarzen Körper (11) in Blickkontakt steht.(7) is in eye contact with a black body (11) arranged in the interior (6).
4. Kältegerät nach Anspruch 1 , dadurch gekennzeichnet, dass die Betriebs- temperatur die Temperatur eines Verdampfers (14) des Kältegeräts ist.4. Refrigerating device according to claim 1, characterized in that the operating temperature is the temperature of an evaporator (14) of the refrigerating device.
5. Kältegerät nach Anspruch 4, dadurch gekennzeichnet, dass der Infrarotsensor (7) mit einer dem Innenraum (6) des Kältegeräts zugewandten Oberfläche des Verdampfers (14) in Blickkontakt steht.5. Refrigerating device according to claim 4, characterized in that the infrared sensor (7) is in eye contact with a surface of the evaporator (14) facing the interior (6) of the refrigerating device.
6. Kältegerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Infrarotsensor (7) mit einer Steuerschaltung für die Betriebstemperatur verbunden und in unmittelbarer Nachbarschaft zu dieser angeordnet ist.6. Refrigerating appliance according to one of the preceding claims, characterized in that the infrared sensor (7) is connected to a control circuit for the operating temperature and is arranged in the immediate vicinity of this.
7. Kältegerät nach Anspruch 6, dadurch gekennzeichnet, dass der Infrarotsensor (7) auf einer gemeinsamen Platine (5) mit der Steuerschaltung angeordnet ist.7. Refrigerating appliance according to claim 6, characterized in that the infrared sensor (7) is arranged on a common circuit board (5) with the control circuit.
8. Kältegerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Temperatursensor in einem ungekuhlten Außenbereich des Kälte- geräts angebracht ist und von einer zu überwachenden Messfläche durch ein infrarotdurchlässiges Fenster (10, 15) getrennt ist. 8. Refrigerating appliance according to one of the preceding claims, characterized in that the temperature sensor is mounted in an uncooled outer area of the refrigerating appliance and is separated from a measuring surface to be monitored by an infrared-transparent window (10, 15).
9. Kältegerät nach Anspruch 8, dadurch gekennzeichnet, dass der Temperatursensor unter einer Frontblende (4) des Kältegeräts untergebracht ist.9. Refrigeration device according to claim 8, characterized in that the temperature sensor is accommodated under a front panel (4) of the refrigeration device.
10. Kältegerät nach einem der vorhergehenden Ansprüche, gekennzeichnet durch eine Linse (15) zum Abbilden einer Messfläche (17) auf eine strahlungsempfind- liehe Fläche des Temperatursensors. 10. Refrigerating appliance according to one of the preceding claims, characterized by a lens (15) for imaging a measuring surface (17) on a radiation-sensitive surface of the temperature sensor.
EP01974320A 2000-10-10 2001-10-01 Refrigerating device with a temperature sensor Withdrawn EP1327127A1 (en)

Applications Claiming Priority (3)

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DE10050074 2000-10-10
DE10050074A DE10050074A1 (en) 2000-10-10 2000-10-10 Refrigeration device with temperature sensor has infrared sensor for detecting operating temperature of refrigeration device, namely operating temperature of inner volume of device
PCT/EP2001/011350 WO2002031453A1 (en) 2000-10-10 2001-10-01 Refrigerating device with a temperature sensor

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EP (1) EP1327127A1 (en)
JP (1) JP2004511764A (en)
KR (1) KR20030040487A (en)
CN (1) CN1220036C (en)
AU (1) AU2001293859A1 (en)
BR (1) BR0114244A (en)
DE (1) DE10050074A1 (en)
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CN1220036C (en) 2005-09-21
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KR20030040487A (en) 2003-05-22
DE10050074A1 (en) 2002-04-18
US20040003611A1 (en) 2004-01-08
PL360730A1 (en) 2004-09-20
BR0114244A (en) 2003-10-07
CN1469992A (en) 2004-01-21
JP2004511764A (en) 2004-04-15

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