EP1775369A1 - Laundry dryer and method for detecting the drum rotation - Google Patents

Laundry dryer and method for detecting the drum rotation Download PDF

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Publication number
EP1775369A1
EP1775369A1 EP06120561A EP06120561A EP1775369A1 EP 1775369 A1 EP1775369 A1 EP 1775369A1 EP 06120561 A EP06120561 A EP 06120561A EP 06120561 A EP06120561 A EP 06120561A EP 1775369 A1 EP1775369 A1 EP 1775369A1
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EP
European Patent Office
Prior art keywords
drum
laundry drier
household laundry
conductive pad
rotational movement
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
EP06120561A
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German (de)
French (fr)
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EP1775369B1 (en
Inventor
Henrik Volkers
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
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BSH Bosch und Siemens Hausgeraete GmbH
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Publication of EP1775369A1 publication Critical patent/EP1775369A1/en
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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/20—Parameters relating to constructional components, e.g. door sensors
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/24—Spin speed; Drum movements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/28—Electric heating
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/58—Indications or alarms to the control system or to the user
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/50—Responding to irregular working conditions, e.g. malfunctioning of blowers

Definitions

  • the invention relates to a household laundry dryer and a method for detecting a rotational movement of a rotary drum of a household tumble dryer by means of an engine specified in the preamble of claims 1 and 11, respectively.
  • a rotatable drum for receiving dry material is driven by a motor.
  • the transmission of the drive torque of the motor takes place for example via a belt, which is optionally preceded by a submitted transmission for better control of the rotational speeds of the drum.
  • Due to faulty components or other errors, such as damage to the engine, a crack of the drive belt connecting the motor with the drum, slippage of the drive belt due to a low belt tension or jamming of the drum may lead to an interruption of the drive and the according to An abrupt standstill of the drum during the drying process of the dry material come.
  • a heater activated during the drying process for heating an air stream flowing through the dry material this can lead to overheating of components within the household tumble dryer.
  • Object of the present invention is to improve a household tumble dryer and a method for detecting a rotational movement of a drum of the type mentioned so that a structurally simple manner, a vast number of leading to a standstill of the drum errors can be determined.
  • the device for detecting a rotational movement or a standstill of the drum comprises a capacitive sensor, the first conductive pad is fixedly arranged on a co-rotating during the rotation of the drum part and the second conductive pad against the first pad.
  • the two conductive pads form an electrical capacitor whose first conductive pad rotates according to the rotational movement of the drum and the second conductive pad remains in place on the other hand.
  • the two conductive coverings are arranged so as to be stationary on the part rotating with the drum or, in contrast, in such a way that a gap forming the insulating dielectric is formed between the two coverings.
  • the capacitance of the capacitive sensor formed by the first and second conductive coating is determined.
  • the fact is taken into account that the drum caused by design-related irregularities such as folds, welds and embossing and manufacturing tolerances naturally has a certain imbalance and accordingly change the distance and the overlap of the two conductive pads in the course of rotation of the drum. The resulting in the course of the rotational movement of the drum capacitance change can be detected in a very simple manner.
  • the first conductive coating on the outer circumference of a drum neck or the drum itself.
  • the capacitive sensor can thereby be constructed very simple overall, the detection of the rotational movement or the standstill of the drum - for example, in contrast to a centrifugal switch on the drive shaft - can be performed directly on the drum itself.
  • a particularly simple design of the first conductive coating can be achieved in that it is formed directly by the outer peripheral surface of the drum or the drum neck.
  • at least the drum neck in the vast majority of cases consists of a conductive metal and is normally well grounded, so that the outer peripheral surface of the drum neck is particularly well suited for the formation of a capacitor.
  • the first conductive and co-rotating with the drum pad as the outer circumference of the drum or the drum neck completely circumferential annular coating. This can during the entire revolution of the drum, the capacitance change of the capacitive sensor can be determined.
  • the first conductive coating is formed by a separate from the drum or the drum neck part, which is then fixed, for example via an adhesive bond on the outer circumference of the drum or the drum neck.
  • a device 44 for detecting the rotational movement of the drum 16 near the rear side 14 of the housing 10 is provided.
  • This device 44 comprises a capacitive sensor 45 whose first conductive pad 46 is formed on the outer circumference of a drum neck 50 of the drum 16.
  • the first conductive pad 46 associated with the drum neck 50 is formed by the outer peripheral surface of the drum neck 50 itself.
  • the drum neck 50 is made of a conductive metal, wherein the drum neck 50 is grounded in the usual way.
  • the first pad 46 is formed as on the outer periphery of the drum neck 50 completely circumferential annular lining.
  • the first coating 46 extends only over a partial length on the outer circumference of the drum neck 50.
  • the around the drum neck 50th A second conductive pad 48 is arranged by means of a support member 52 on the housing 10 and opposite to the first conductive pad 46 stationary opposite circumferential first conductive pad 46 opposite.
  • the second conductive pad 48 is formed in the present embodiment of a small plate member which is arranged substantially parallel to the outer surface of the drum neck 50.
  • the two conductive pads 46, 48 are arranged at such a distance from each other that a gap is formed, which forms the insulating dielectric between the two pads 46, 48 of the capacitive sensor 45.
  • the dielectric consists of the ambient air present within the household tumble drier.
  • the capacitance over a certain period of time is determined by the measuring device 54 and checked whether there is a change in capacitance or whether the capacity of the sensor 45 from a predetermined value over the predetermined period does not deviate. If no capacitance change of the sensor 45 and thus a drum standstill are detected via the measuring device 54, then a fault signal can be signaled to the program control 40 via a signal line 60, for example. If necessary, the motor 24, the blower 32 and the heater 38 can be switched off via the program control 40 so that further damage within the household tumble drier can be effectively avoided.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Abstract

The opposing conducting armatures (46,48) of a capacitive sensor (45) form an electrical capacitor and are arranged rigidly on the part rotating with the drum (16) to form a gap between the armatures for an insulating dielectric. The capacitance variation is detected by a measuring device (54) connected to the armatures by measuring cables (56,58). If the rotary movement of the drum is interrupted, there is no capacitance variation of the sensor and the drum is stopped. A fault signal is transmitted to a program control (40) through a signal cable (60). An independent claim is included for the method of detecting the rotary movement of a drum of a domestic layer.

Description

Die Erfindung betrifft einen Haushaltswäschetrockner und ein Verfahren zum Erkennen einer Drehbewegung einer mittels eines Motors drehbaren Trommel eines Haushaltswäschetrockners der im Oberbegriff der Patentansprüche 1 bzw. 11 angegebenen Art.The invention relates to a household laundry dryer and a method for detecting a rotational movement of a rotary drum of a household tumble dryer by means of an engine specified in the preamble of claims 1 and 11, respectively.

Bei derartigen, ganz allgemein beispielsweise aus der DE 102 59 344 A1 oder der DE 103 60 867 A1 als bekannt zu entnehmenden Haushaltswäschetrocknern wird eine drehbare Trommel zur Aufnahme von Trockengut mittels eines Motors angetrieben. Die Übertragung des Antriebsdrehmoments des Motors erfolgt dabei beispielsweise über einen Riemen, dem gegebenenfalls ein vorgelegtes Getriebe zur besseren Steuerung der Drehzahlen der Trommel vorgeschaltet ist. Durch fehlerhafte Bauteile oder andere Fehlerfälle, wie beispielsweise ein Schaden des Motors, ein Riss des den Motor mit der Trommel verbindenden Antriebsriemens, ein Durchrutschen des Antriebsriemens aufgrund einer zu geringen Riemenspannung oder ein Blockieren der Trommel kann es zu einer Unterbrechung des Antriebs und dem gemäß zu einem abrupten Stillstand der Trommel während des Trockenvorgangs des Trockenguts kommen. Insbesondere bei einer während des Trockenvorgangs aktivierten Heizung zur Erwärmung eines das Trockengut durchströmenden Luftstroms kann dies zu einer Überhitzung von Bauteilen innerhalb des Haushaltswäschetrockners führen.In such, in general, for example, from the DE 102 59 344 A1 or the DE 103 60 867 A1 As known to be removed household tumble driers a rotatable drum for receiving dry material is driven by a motor. The transmission of the drive torque of the motor takes place for example via a belt, which is optionally preceded by a submitted transmission for better control of the rotational speeds of the drum. Due to faulty components or other errors, such as damage to the engine, a crack of the drive belt connecting the motor with the drum, slippage of the drive belt due to a low belt tension or jamming of the drum may lead to an interruption of the drive and the according to An abrupt standstill of the drum during the drying process of the dry material come. In particular, in the case of a heater activated during the drying process for heating an air stream flowing through the dry material, this can lead to overheating of components within the household tumble dryer.

Aus diesem Grund sind bei heute üblichen Haushaltswäschetrocknern Einrichtungen vorgesehen, mit denen eine Drehbewegung respektive ein Stillstand der Trommel erkannt werden kann. Hierzu werden beispielsweise Fliehkraftschalter verwendet, welche eine Drehbewegung der Antriebswelle des Motors erfassen. Außerdem ist es bereits bekannt, das Reißen eines Antriebsriemens durch einen sog. Riemenrissschalter zu erkennen. Schließlich sind aus dem Haushaltswäschetrocknerbau auch Tachogeber als bekannt zu entnehmen, bei welchen ein Magnet an einem durch den Motor drehbewegten Teil wie beispielsweise der Trommel, dem Trommellagerrad oder einem Zahnrad angeordnet ist und dessen Drehbewegung beispielsweise mittels eines Hallelements oder eines anderen Erfassungsmittels aufgenommen wird.For this reason, devices are provided with today conventional household tumble driers, with which a rotational movement or a standstill of the drum can be detected. For this example, centrifugal switches are used, which detect a rotational movement of the drive shaft of the motor. In addition, it is already known to detect the tearing of a drive belt by a so-called. Belt breaker. Finally, from the Haushaltswäschetrocknerbau also speedometer as known can be found in which a magnet is arranged on a rotatable by the motor part such as the drum, the Drum wheel or a gear and whose rotation is received, for example by means of a Hall element or other detection means.

Aufgabe der vorliegenden Erfindung ist es, einen Haushaltswäschetrockner sowie ein Verfahren zum Erkennen einer Drehbewegung einer Trommel der eingangs genannten Art so zu verbessern, dass auf baulich einfache Weise eine überwiegende Zahl von zum Stillstand der Trommel führenden Fehlerfällen ermittelt werden können.Object of the present invention is to improve a household tumble dryer and a method for detecting a rotational movement of a drum of the type mentioned so that a structurally simple manner, a vast number of leading to a standstill of the drum errors can be determined.

Diese Aufgabe wird erfindungsgemäß durch einen Haushaltswäschetrockner und ein Verfahren zum Erkennen einer Drehbewegung einer Trommel mit den Merkmalen der Patentansprüche 1 bzw. 11 gelöst. Vorteilhafte Ausgestaltungen mit zweckmäßigen und nicht-trivialen Weiterbildungen der Erfindung sind in den übrigen Patentansprüchen beschrieben.This object is achieved by a household laundry dryer and a method for detecting a rotational movement of a drum with the features of claims 1 and 11, respectively. Advantageous embodiments with expedient and non-trivial developments of the invention are described in the remaining claims.

Bei dem Haushaltswäschetrockner nach der Erfindung umfasst die Einrichtung zum Erkennen einer Drehbewegung bzw. eines Stillstandes der Trommel einen kapazitiven Sensor, dessen erster leitfähiger Belag an einem bei der Drehbewegung der Trommel mitdrehenden Teil und dessen zweiter leitfähiger Belag gegenüber dem ersten Belag ortsfest angeordnet ist. Mit anderen Worten bilden die beiden leitfähigen Beläge einen elektrischen Kondensator, dessen erster leitfähiger Belag entsprechend der Drehbewegung der Trommel mitgedreht und dessen zweiter leitfähiger Belag demgegenüber an Ort und Stelle verbleibt. Die beiden leitfähigen Beläge sind dabei so an dem mit der Trommel mitdrehenden Teil bzw. demgegenüber ortsfest angeordnet, dass sich zwischen den beiden Belägen ein das isolierende Dielektrikum bildender Spalt ausbildet.In the household laundry drier according to the invention, the device for detecting a rotational movement or a standstill of the drum comprises a capacitive sensor, the first conductive pad is fixedly arranged on a co-rotating during the rotation of the drum part and the second conductive pad against the first pad. In other words, the two conductive pads form an electrical capacitor whose first conductive pad rotates according to the rotational movement of the drum and the second conductive pad remains in place on the other hand. In this case, the two conductive coverings are arranged so as to be stationary on the part rotating with the drum or, in contrast, in such a way that a gap forming the insulating dielectric is formed between the two coverings.

Beim hierzu erfindungsgemäß vorgesehenen Verfahren zum Erkennen einer Drehbewegung der Trommel wird dabei die Kapazität des durch den ersten und zweiten leitfähigen Belag gebildeten kapazitiven Sensors ermittelt. Hierbei wird dem Umstand Rechnung getragen, dass die Trommel bedingt durch konstruktionsbedingte Unregelmäßigkeiten wie Falze, Schweißnähte und Prägungen sowie fertigungstechnische Toleranzen naturgemäß eine gewisse Unwucht aufweist und sich demgemäß der Abstand und die Überschneidung der beiden leitfähigen Beläge im Verlauf der Drehbewegung der Trommel ändern. Die hierdurch im Verlauf der Drehbewegung der Trommel entstehende Kapazitätsänderung kann dabei auf äußerst einfache Weise erfasst werden.When inventively provided for detecting a rotational movement of the drum, the capacitance of the capacitive sensor formed by the first and second conductive coating is determined. Here, the fact is taken into account that the drum caused by design-related irregularities such as folds, welds and embossing and manufacturing tolerances naturally has a certain imbalance and accordingly change the distance and the overlap of the two conductive pads in the course of rotation of the drum. The resulting in the course of the rotational movement of the drum capacitance change can be detected in a very simple manner.

Im Unterschied zu bekannten Fliehkraftschaltern an der Antriebswelle - welche beispielsweise einen Riss des Antriebsriemens nicht erfassen können - und Riemenrissschaltern -welche beispielsweise einen durchrutschenden Antriebsriemen nicht erkennen - ermöglicht der erfindungsgemäße Einsatz eines kapazitiven Sensors unmittelbar an einem bei der Drehbewegung der Trommel mitdrehenden Teil die Erfassung annähernd aller Fehlerfälle, die zu einem Stillstand der Trommel während des Trockenvorgangs führen können. Dabei erfolgt die Messung auf besonders einfache und zuverlässige Weise.In contrast to known centrifugal force switches on the drive shaft - which can not detect, for example, a crack of the drive belt - and belt breakers - which, for example, do not recognize a slipping drive belt - allows the inventive use of a capacitive sensor directly on a co-rotating during the rotation of the drum part, the detection approximately all faults that can lead to a standstill of the drum during the drying process. The measurement is carried out in a particularly simple and reliable manner.

So hat es sich beispielsweise als insbesondere vorteilhaft gezeigt, den ersten leitfähigen Belag am Außenumfang eines Trommelhalses oder der Trommel selbst auszubilden. Der kapazitive Sensor kann hierdurch insgesamt sehr einfach aufgebaut sein, wobei die Erkennung der Drehbewegung bzw. des Stillstandes der Trommel - beispielsweise im Unterschied zu einem Fliehkraftschalter an der Antriebswelle - unmittelbar an der Trommel selbst durchgeführt werden kann. Eine besonders einfache Gestaltung des ersten leitfähigen Belages kann dadurch erreicht werden, dass dieser unmittelbar durch die Außenumfangsfläche der Trommel bzw. des Trommelhalses gebildet wird. Erfahrungsgemäß besteht zumindest der Trommelhals in den allermeisten Fällen aus einem leitfähigen Metall und ist normalerweise gut geerdet, so dass sich die Außenumfangsfläche des Trommelhalses auf besonders gute Weise für die Bildung eines Kondensators eignet.For example, it has proven particularly advantageous to form the first conductive coating on the outer circumference of a drum neck or the drum itself. The capacitive sensor can thereby be constructed very simple overall, the detection of the rotational movement or the standstill of the drum - for example, in contrast to a centrifugal switch on the drive shaft - can be performed directly on the drum itself. A particularly simple design of the first conductive coating can be achieved in that it is formed directly by the outer peripheral surface of the drum or the drum neck. Experience has shown that at least the drum neck in the vast majority of cases consists of a conductive metal and is normally well grounded, so that the outer peripheral surface of the drum neck is particularly well suited for the formation of a capacitor.

Als weiter vorteilhaft hat es sich gezeigt, den ersten leitfähigen und mit der Trommel mitdrehenden Belag als am Außenumfang der Trommel bzw. des Trommelhalses vollständig umlaufender Ringbelag auszubilden. Hierdurch kann während der gesamten Umdrehung der Trommel die Kapazitätsänderung des kapazitiven Sensors ermittelt werden. Gleichfalls wäre es natürlich auch denkbar, den ersten leitfähigen Belag nur bereichsweise am Außenumfang der Trommel anzuordnen. So wäre es beispielsweise denkbar, den ersten leitfähigen Belag lediglich an einem Viertel oder der Hälfte des Außenumfangs vorzusehen. Dabei wäre es natürlich auch denkbar, dass der leitfähige Belag von einem von der Trommel oder dem Trommelhals separaten Teil gebildet wird, welches dann beispielsweise über eine Klebverbindung am Außenumfang der Trommel bzw. des Trommelhalses fixiert wird.As a further advantage, it has been shown to form the first conductive and co-rotating with the drum pad as the outer circumference of the drum or the drum neck completely circumferential annular coating. This can during the entire revolution of the drum, the capacitance change of the capacitive sensor can be determined. Likewise, it would of course also conceivable to arrange the first conductive coating only in regions on the outer circumference of the drum. For example, it would be conceivable to provide the first conductive coating only on a quarter or half of the outer circumference. It would of course also conceivable that the conductive coating is formed by a separate from the drum or the drum neck part, which is then fixed, for example via an adhesive bond on the outer circumference of the drum or the drum neck.

Bei der Durchführung des erfindungsgemäßen Verfahrens hat es sich zudem als vorteilhaft gezeigt, die Kapazitätsänderungen des kapazitiven Sensors über eine vorbestimmte Zeitdauer zu ermitteln. Hierdurch wird eine besonders sichere Erkennung eines Trommelstillstandes ermöglicht. Wird während dieser vorbestimmten Zeitdauer keine Kapazitätsänderung ermittelt, so wird ein Signal beispielsweise zum Abschalten einer Heizung und/oder des Motors erzeugt.In carrying out the method according to the invention, it has also proven to be advantageous to determine the capacitance changes of the capacitive sensor over a predetermined period of time. This allows a particularly secure detection of a drum standstill. If no change in capacitance is determined during this predetermined period of time, then a signal is generated, for example, to switch off a heater and / or the motor.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines bevorzugten Ausführungsbeispiels sowie anhand der Zeichnung; diese zeigt:

  • Eine schematische Schnittansicht durch einen Haushaltswäschetrockner mit einer mittels eines Motors drehbaren Trommel und einer Einrichtung zum Erkennung der Drehbewegung der Trommel.
  • Von einem Haushaltswäschetrockner ist in der Figur im Wesentlichen ein Gehäuse 10 mit einer Ober- und Unterseite sowie einer vorderen Stirnseite 12 und einer Rückseite 14 erkennbar. Innerhalb des Haushaltswäschetrockners ist eine drehbare Trommel 16 angeordnet, welche mit einer Trommelwelle 18 und einer fest mit der Rückseite 14 verbundenen Wellenbuchse 20 - um die Trommelachse T drehbar - gehalten ist. An ihrem der vorderen Stirnseite 12 zugeordneten Ende ist die Trommel 16 außerdem über ein Trommellagerrad 22 gehalten. Zum Drehantrieb der Trommel 16 ist ein Motor 24 vorgesehen, der ein mit einem Antriebsriemen 26 in Eingriff stehendes Zahnrad 28 dreht. Hierzu steht der Antriebsriemen 26 mit einer am Außenumfang der Trommel 16 vorgesehenen und nicht dargestellten Zahnung im Eingriff.
  • Über eine Beschickungstür 30 in der Stirnseite 12 des Gehäuses 10 kann die Trommel mit nassem Trockengut befüllt. Während des Trockenvorgangs wird die Trommel 16 bzw. das sich darin befindende Trockengut mit einem Luftstrom beaufschlagt, der über ein Gebläse 32 erzeugt wird. Das Gebläse 32 ist im vorliegenden Ausführungsbeispiel innerhalb eines Auslasskanals 34 nahe der Stirnseite 12 des Gehäuses 10 angeordnet. In einem Einlasskanal 36 nahe der Rückseite 14 des Gehäuses 10 ist eine Heizung 38 angeordnet, mit welcher der durch die Trommel 16 bzw. das Trockengut strömende Luftstrom erwärmt werden kann. Der Trockenvorgang ist über eine Programmsteuerung 40 steuerbar, welche mit einer Bedieneinheit 42 in Kontakt steht.
Further advantages, features and details of the invention will become apparent from the following description of a preferred embodiment and from the drawing; this shows:
  • A schematic sectional view through a household laundry dryer with a drum rotatable by a motor and means for detecting the rotational movement of the drum.
  • From a household tumble dryer in the figure, a housing 10 with a top and bottom and a front end face 12 and a rear side 14 is substantially recognizable. Within the household tumble dryer, a rotatable drum 16 is arranged, which is held with a drum shaft 18 and a firmly connected to the back 14 shaft bushing 20 - rotatable about the drum axis T. At its front end 12 associated end of the drum 16 is also held on a drum bearing wheel 22. For the rotary drive of the drum 16, a motor 24 is provided which one with a Drive belt 26 engaged gear 28 rotates. For this purpose, the drive belt 26 is provided with a provided on the outer circumference of the drum 16 and not shown teeth in engagement.
  • About a feed door 30 in the end face 12 of the housing 10, the drum can be filled with wet dry material. During the drying process, the drum 16 or the dry matter therein is subjected to an air flow, which is generated by a blower 32. The fan 32 is arranged in the present embodiment within an outlet channel 34 near the end face 12 of the housing 10. In an inlet channel 36 near the back 14 of the housing 10, a heater 38 is arranged, with which the air flow flowing through the drum 16 and the dry material can be heated. The drying process can be controlled via a program control 40, which is in contact with an operating unit 42.

Damit eine unerwünschte Unterbrechung der Drehbewegung der Trommel 16 bzw. ein Stillstand - beispielsweise aufgrund eines Schadens des Motors 24, eines Reißens oder Durchrutschens des Antriebsriemens 26 oder eines Blockierens der Trommel 16 - ermittelt werden kann, ist eine Einrichtung 44 zum Erkennen der Drehbewegung der Trommel 16 nahe der Rückseite 14 des Gehäuses 10 vorgesehen. Diese Einrichtung 44 umfasst einen kapazitiven Sensor 45, dessen erster leitfähiger Belag 46 am Außenumfang eines Trommelhalses 50 der Trommel 16 ausgebildet ist. Im vorliegenden Ausführungsbeispiel ist der dem Trommelhals 50 zugeordnete erste leitfähige Belag 46 durch die Außenumfangsfläche des Trommelhalses 50 selbst gebildet. Hierzu ist der Trommelhals 50 aus einem leitfähigen Metall gestaltet, wobei der Trommelhals 50 in üblicher Weise geerdet ist. Außerdem ist im vorliegenden Ausführungsbeispiel der erste Belag 46 als am Außenumfang des Trommelhalses 50 vollständig umlaufender Ringbelag ausgebildet. Gleichfalls wäre es natürlich auch denkbar, dass sich der erste Belag 46 lediglich über eine Teillänge am Außenumfang des Trommelhalses 50 erstreckt. Außerdem wäre es auch denkbar, den ersten Belag 46 als separates Teil auszubilden und beispielsweise mittels einer Klebverbindung an dem Trommelhals 50 zu befestigen. Dem um den Trommelhals 50 umlaufenden ersten leitfähigen Belag 46 gegenüberliegend ist ein zweiter leitfähiger Belag 48 mittels eines Tragteils 52 am Gehäuse 10 und gegenüber dem ersten leitfähigen Belag 46 ortsfest angeordnet. Der zweite leitfähige Belag 48 ist im vorliegenden Ausführungsbeispiel von einem kleinen Plattenteil gebildet, welches im Wesentlichen flächenparallel zum Außenumfang des Trommelhalses 50 angeordnet ist. Die beiden leitfähigen Beläge 46, 48 sind dabei in einem derartigen Abstand zueinander angeordnet, dass ein Spalt entsteht, welcher das isolierende Dielektrikum zwischen den beiden Belägen 46, 48 des kapazitiven Sensors 45 bildet. Das Dielektrikum besteht demgemäß im vorliegenden Ausführungsbeispiel aus der innerhalb des Haushaltswäschetrockners vorliegenden Umgebungsluft.In order that an unwanted interruption of the rotational movement of the drum 16 or a standstill - for example, due to damage of the motor 24, a rupture or slippage of the drive belt 26 or a blocking of the drum 16 - can be determined, is a device 44 for detecting the rotational movement of the drum 16 near the rear side 14 of the housing 10 is provided. This device 44 comprises a capacitive sensor 45 whose first conductive pad 46 is formed on the outer circumference of a drum neck 50 of the drum 16. In the present embodiment, the first conductive pad 46 associated with the drum neck 50 is formed by the outer peripheral surface of the drum neck 50 itself. For this purpose, the drum neck 50 is made of a conductive metal, wherein the drum neck 50 is grounded in the usual way. In addition, in the present embodiment, the first pad 46 is formed as on the outer periphery of the drum neck 50 completely circumferential annular lining. Likewise, it would of course also be conceivable that the first coating 46 extends only over a partial length on the outer circumference of the drum neck 50. In addition, it would also be conceivable to form the first covering 46 as a separate part and to fix it to the drum neck 50, for example by means of an adhesive bond. The around the drum neck 50th A second conductive pad 48 is arranged by means of a support member 52 on the housing 10 and opposite to the first conductive pad 46 stationary opposite circumferential first conductive pad 46 opposite. The second conductive pad 48 is formed in the present embodiment of a small plate member which is arranged substantially parallel to the outer surface of the drum neck 50. The two conductive pads 46, 48 are arranged at such a distance from each other that a gap is formed, which forms the insulating dielectric between the two pads 46, 48 of the capacitive sensor 45. Accordingly, in the present exemplary embodiment, the dielectric consists of the ambient air present within the household tumble drier.

Zwischen dem zweiten leitfähigen Belag 48 und dem Tragteil 52 ist eine im vorliegenden Ausführungsbeispiel nicht gezeigte Isolation vorgesehen. Als im Rahmen der Erfindung mit umfasst ist es zu betrachten, dass anstelle des hier vorgesehenen einen kapazitiven Sensors 45 natürlich auch mehrere am Außenumfang des Trommelhalses 50 angeordnet sein können. Dies wäre im vorliegenden Ausführungsbeispiel einfach dadurch zu verwirklichen, dass eine Mehrzahl von zweiten leitfähigen Belägen 48 gegenüber dem Außenumfang des Trommelhalses 50 verteilt angeordnet werden.Between the second conductive pad 48 and the support member 52, an insulation not shown in the present embodiment is provided. As part of the invention, it should be considered that instead of the capacitive sensor 45 provided here, it is of course also possible for a plurality to be arranged on the outer circumference of the drum neck 50. In the present exemplary embodiment, this would be achieved simply by arranging a plurality of second conductive coverings 48 distributed relative to the outer circumference of the drum neck 50.

Wird nun die Trommel 16 gedreht, so entstehen am Trommelhals 50 aufgrund von fertigungsbedingten Toleranzen Unwuchten im Bereich seines Außenumfangs, so dass sich der Abstand und die Überschneidung der beiden leitfähigen Beläge 46, 48 während der Drehbewegung der Trommel 16 permanent ändert. Diese Kapazitätsänderung kann durch eine geeignete Messeinrichtung 54 erfasst werden, welche über Messleitungen 56, 58 mit dem ersten und zweiten Belag 46, 48 verbunden ist. Wird nun aufgrund eines Fehlerfalls die Drehbewegung der Trommel 16 unterbrochen bzw. steht diese still, so wird demgemäß über die Messeinrichtung 54 keine Kapazitätsänderung mehr erfasst. Hierzu wird die Kapazität über einen gewissen Zeitraum durch die Messeinrichtung 54 ermittelt und überprüft, ob eine Kapazitätsänderung vorliegt bzw. ob die Kapazität des Sensors 45 von einem vorbestimmten Wert über den vorbestimmten Zeitraum nicht abweicht. Wird über die Messeinrichtung 54 demgemäß keine Kapazitätsänderung des Sensors 45 und somit ein Trommelstillstand festgestellt, so kann beispielsweise über eine Signalleitung 60 ein Störungssignal an die Programmsteuerung 40 gemeldet werden. Über die Programmsteuerung 40 ist dann gegebenenfalls der Motor 24, das Gebläse 32 sowie die Heizung 38 abschaltbar, damit weitere Schäden innerhalb des Haushaltswäschetrockners wirksam vermieden werden können.If the drum 16 is now rotated, imbalances in the region of its outer circumference arise on the drum neck 50 due to production-related tolerances, so that the distance and the intersection of the two conductive linings 46, 48 changes permanently during the rotational movement of the drum 16. This capacitance change can be detected by a suitable measuring device 54, which is connected via measuring lines 56, 58 to the first and second coverings 46, 48. If, due to an error, the rotational movement of the drum 16 is interrupted or if it stands still, then no capacity change is detected by the measuring device 54. For this purpose, the capacitance over a certain period of time is determined by the measuring device 54 and checked whether there is a change in capacitance or whether the capacity of the sensor 45 from a predetermined value over the predetermined period does not deviate. If no capacitance change of the sensor 45 and thus a drum standstill are detected via the measuring device 54, then a fault signal can be signaled to the program control 40 via a signal line 60, for example. If necessary, the motor 24, the blower 32 and the heater 38 can be switched off via the program control 40 so that further damage within the household tumble drier can be effectively avoided.

Claims (14)

Haushaltswäschetrockner mit einer mittels eines Motors (24) drehbaren Trommel (16) zur Aufnahme von Trockengut und mit einer Einrichtung (44) zum Erkennen einer Drehbewegung der Trommel (16),
dadurch gekennzeichnet,dass die Einrichtung(44)zum Erkennen einer Drehbewegung der Trommel (16) einen kapazitiven Sensor (45) umfasst, dessen erster leitfähiger Belag (46) an einem bei der Drehbewegung der Trommel (16) mitdrehenden Teil (50) und dessen zweiter leitfähiger Belag (48) gegenüber dem ersten leitfähigen Belag (46) ortsfest angeordnet ist.Household laundry drier comprising a drum (16) rotatable by a motor (24) for receiving dry material and having means (44) for detecting rotational movement of the drum (16),
characterized in that the means (44) for detecting a rotational movement of the drum (16) comprises a capacitive sensor (45), the first conductive pad (46) on a during the rotation of the drum (16) co-rotating part (50) and its second conductive pad (48) opposite to the first conductive pad (46) is arranged stationary. Haushaltswäschetrockner nach Anspruch 1,
dadurch gekennzeichnet, dass der erste leitfähige Belag (46) am Außenumfang eines Trommelhalses (50) der Trommel (16) ausgebildet ist.Household laundry drier according to claim 1,
characterized in that the first conductive pad (46) on the outer circumference of a drum neck (50) of the drum (16) is formed. Haushaltswäschetrockner nach Anspruch 1,
dadurch gekennzeichnet, dass der erste leitfähige Belag (46) am Außenumfang der Trommel (16) ausgebildet ist.Household laundry drier according to claim 1,
characterized in that the first conductive pad (46) is formed on the outer circumference of the drum (16). Haushaltswäschetrockner nach einem der Ansprüche 2 oder 3,
dadurch gekennzeichnet, dass der erste leitfähige Belag (46) durch die Außenumfangsfläche der Trommel (16) beziehungsweise des Trommelhalses gebildet ist.Household tumble dryer according to one of claims 2 or 3,
characterized in that the first conductive pad (46) is formed by the outer peripheral surface of the drum (16) or drum neck. Haushaltswäschetrockner nach einem der Ansprüche 2 bis 4,
dadurch gekennzeichnet, dass der erste leitfähige Belag (46) als am Außenumfang der Trommel (16) beziehungsweise des Trommelhalses (50) vollständig umlaufender Ringbelag ausgebildet ist.Household laundry drier according to one of claims 2 to 4,
characterized in that the first conductive coating (46) as on the outer circumference of the drum (16) and the drum neck (50) is completely formed annular lining. Haushaltswäschetrockner nach einem der Ansprüche 2 bis 5,
dadurch gekennzeichnet, dass der zweite leitfähige Belag (48) von einem Plattenteil gebildet ist, welches im wesentlichen flächenparallel zum Außenumfang der Trommel (16) beziehungsweise des Trommelhalses (50) angeordnet ist.Household laundry drier according to one of claims 2 to 5,
characterized in that the second conductive coating (48) is formed by a plate part, which is substantially parallel to the surface is arranged to the outer periphery of the drum (16) or the drum neck (50). Haushaltswäschetrockner nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet, dass zwischen dem zweiten leitfähigen Belag (48) und einem diesen haltenden Tragteil (52) eine Isolation vorgesehen ist.Household laundry drier according to one of claims 1 to 6,
characterized in that an insulation is provided between the second conductive coating (48) and a support member (52) holding this. Haushaltswäschetrockner nach einem der Ansprüche 2 bis 7,
dadurch gekennzeichnet, dass eine Mehrzahl von zweiten leitfähigen Belägen (48) vorgesehen sind, welche gegenüber dem Außenumfang der Trommel (18) beziehungsweise des Trommelhalses (50) verteilt angeordnet sind.Household laundry drier according to one of claims 2 to 7,
characterized in that a plurality of second conductive pads (48) are provided which are arranged distributed with respect to the outer circumference of the drum (18) or the drum neck (50). Haushaltswäschetrockner nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet, dass die Einrichtung (44) zum Erkennen einer Drehbewegung der Trommel (16) über eine Programmsteuerung (40) mit einer Heizung (38), einem Gebläse (32) und/oder dem Motor (24) verbunden ist.Household laundry drier according to one of claims 1 to 8,
characterized in that the means (44) for detecting a rotational movement of the drum (16) via a program control (40) with a heater (38), a fan (32) and / or the motor (24) is connected. Haushaltswäschetrockner nach einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet, dass die Einrichtung (44) zum Erkennen einer Drehbewegung der Trommel (16) eine Messeinrichtung (54) umfasst, mit der eine Kapazitätsänderung des kapazitiven Sensors (45) ermittelbar ist.Household laundry drier according to one of claims 1 to 9,
characterized in that the means (44) for detecting a rotational movement of the drum (16) comprises a measuring device (54), with which a capacitance change of the capacitive sensor (45) can be determined. Verfahren zum Erkennen einer Drehbewegung einer mittels eines Motors (24) drehbaren Trommel (16) eines Haushaltswäschetrockners, bei welchem über eine Einrichtung (44) eine Drehbewegung der Trommel (16) ermittelt wird,
dadurch gekennzeichnet, dass die Kapazitätsänderung eines kapazitiven Sensors (45) umfassend einen ersten leitfähigen Belag (46) an einem bei der Drehbewegung der Trommel (16) mitdrehenden Teil (50) und einen gegenüber dem ersten Belag (46) ortsfesten zweiten leitfähigen Belag (48) ermittelt wird.Method for detecting a rotational movement of a drum (16) of a household laundry drier which can be rotated by means of a motor (24), in which a rotary movement of the drum (16) is determined by means (44),
characterized in that the capacitance change of a capacitive sensor (45) comprising a first conductive pad (46) on a during the rotational movement of the drum (16) co-rotating part (50) and a second conductive pad (48) fixed relative to the first pad (46) is determined. Verfahren nach Anspruch 11,
dadurch gekennzeichnet, dass die Kapazitätsänderung des kapazitiven Sensors (45) über eine vorbestimmte Zeitdauer ermittelt wird.Method according to claim 11,
characterized in that the capacitance change of the capacitive sensor (45) is determined over a predetermined period of time. Verfahren nach Anspruch 12,
dadurch gekennzeichnet, dass im Falle keiner Kapazitätsänderung des kapazitiven Sensors (45) während der vorbestimmten Zeitdauer ein Signal über die Erkennung eines Trommelstillstands erzeugt wird.Method according to claim 12,
characterized in that in the case of no capacitance change of the capacitive sensor (45) during the predetermined period of time, a signal is generated on the detection of a drum standstill. Verfahren nach Anspruch 13,
dadurch gekennzeichnet, dass nach der Erkennung eines Trommelstillstands eine Heizung (38), ein Gebläse (32) und/oder der Motor (24) abgeschalten wird.Method according to claim 13,
characterized in that after the detection of a drum standstill, a heater (38), a fan (32) and / or the motor (24) is turned off.
EP06120561A 2005-10-12 2006-09-13 Laundry dryer and method for detecting the drum rotation Not-in-force EP1775369B1 (en)

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ATE420237T1 (en) 2009-01-15
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DE102005048890A1 (en) 2007-04-19
DE502006002563D1 (en) 2009-02-26

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