DE2653322C2 - Clothes dryer - Google Patents

Clothes dryer

Info

Publication number
DE2653322C2
DE2653322C2 DE2653322A DE2653322A DE2653322C2 DE 2653322 C2 DE2653322 C2 DE 2653322C2 DE 2653322 A DE2653322 A DE 2653322A DE 2653322 A DE2653322 A DE 2653322A DE 2653322 C2 DE2653322 C2 DE 2653322C2
Authority
DE
Germany
Prior art keywords
ptc
resistors
dryer
drying program
ptc resistors
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
Application number
DE2653322A
Other languages
German (de)
Other versions
DE2653322A1 (en
Inventor
Walter Dipl.-Phys. 8500 Nürnberg Heißmeier
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs 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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DE2653322A priority Critical patent/DE2653322C2/en
Priority to GB46814/77A priority patent/GB1553145A/en
Priority to NL7712547A priority patent/NL7712547A/en
Priority to CH1406977A priority patent/CH620723A5/en
Priority to IT29947/77A priority patent/IT1088287B/en
Publication of DE2653322A1 publication Critical patent/DE2653322A1/en
Application granted granted Critical
Publication of DE2653322C2 publication Critical patent/DE2653322C2/en
Expired legal-status Critical Current

Links

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
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/26—Heating arrangements, e.g. gas heating equipment
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • 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
    • D06F2103/52—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to electric heating means, e.g. temperature or voltage
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Drying Of Solid Materials (AREA)
  • Control Of Temperature (AREA)
  • Control Of Resistance Heating (AREA)

Description

Die Erfindung betrifft einen Wäschetrockner mit einer über die Trocknersteuerung schaltbaren PTC-Widerstandsheizung. The invention relates to a tumble dryer with a PTC resistance heater that can be switched via the dryer control.

Ein derartiger Wäschetrockner ist durch die DE-OS 59 035 bekannt.Such a tumble dryer is known from DE-OS 59 035.

Da der Widerstandswert eines PTC-Widerstands bei niedrigen Temperaturen klein ist, treten bei Wäschetrocknern derart hohe Einschaltströme auf, daß zusätzliche Überlastungsschutzeinrichtungen oder eine Zusatzheizung zum Vorheizen des Kaltleiters notwendig sind. Die Verwendung von PTC-Heizwiderständen beschränkte sich deshalb auf relativ kleine Heizleistungen. Since the resistance value of a PTC resistor is small at low temperatures, this is the case with tumble dryers such high inrush currents that additional overload protection devices or a Additional heating is required to preheat the PTC thermistor. The use of PTC heating resistors therefore limited to relatively small heating outputs.

Der Erfindung liegt die Aufgabe zugrunde, einen Wäschetrockner der eingangs genannten Art so auszubilden, daß ein Einsatz von PTC-Widerständen ohne die aufwendigen Zusatzvorrichtungen auch bei Leistungen um 3 KW möglich istThe invention is based on the object of providing a tumble dryer of the type mentioned at the outset train that a use of PTC resistors without the complex additional devices is possible even with a power of 3 KW

Diese Aufgabe wird erfindungsgemäß einmal dadurch gelöst daß die Heizung aus mehreren PTC-Widerständen (Kaltleitern) besteht die so angeordnet sind, daß die PTC-Widerstände durch die Trocknersteuerung aus einer Serienschaltung zu Beginn des Trockenprogrammes zeit- oder temperaturabhängig in eine Paralleloder Teilparallelschaltung umschaltbar sind. Durch die Serienschaltung der Kaltleiter bei Beginn des Trockenprogrammes summieren sich ihre Einzelwiderslände, so daß die Einschaltstromspitze abgesenkt wird. In der Parallelschaltung steht dann während des Trockenprogrammes die volle Heizleistung aller Kaltleiter zur Verfugung.According to the invention, this object is achieved once in that the heater consists of several PTC resistors (PTC thermistors) which are arranged in such a way that the PTC resistors are controlled by the dryer a series connection at the beginning of the drying program, depending on time or temperature, into a parallel or Partial parallel connection are switchable. By connecting the PTC thermistors in series at the start of the drying program Their individual resistances add up, so that the inrush current peak is reduced. In the In parallel connection, the full heating output of all PTC thermistors is available during the drying program Disposal.

Eine weitere Lösung der Aufgabe besteht erfindungsgemäß darin, daß die Heizung aus mehreren PTC-Widerständen (Kaltleitern) besteht die in Parallelschaltung angeordnet sind, und daß zu Beginn des Trockenprogrammes durch die Trocknersteuerung nur so viele PTC-Widerstände an Spannung legbar sind, daß der Einscha'tstrorn unter einem Grenzwert liegt, und daß während des Trockenprogrammes weitere PTC-Widerstände zeit- oder temperaturabhängig unter Berücksichtigung der zulässigen Stromspitze zuschaltbar sind. Die Zeitkonstante, um die versetzt weitere PTC-Widerstände durch ein Programmschaltwerk oder einen Zeitschalter in den Heizstromkreis eingeschaltet werden, ergibt sich aus der Zeitdauer bis der bereits an Spannung liegende PTC-Widerstand die Temperatur erreicht, ab der sein Widerstandswert sprunghaft ansteigtAccording to the invention, a further solution to the problem consists in that the heater consists of several PTC resistors (PTC thermistors) are arranged in parallel, and that at the beginning of the During the drying program, only so many PTC resistors can be connected to voltage by the dryer control that the inrush current is below a limit value, and that during the drying program further PTC resistors, depending on time or temperature, are below Taking into account the permissible current peak can be switched on. The time constant by which the additional PTC resistors switched into the heating circuit by a program switch or a timer results from the time until the PTC resistor, which is already connected to voltage, reaches the temperature reached, from which its resistance increases by leaps and bounds

In vorteilhafter Weise kann eine Verkürzung der Zeitspanne bis zum Einschalten aller HeizwiderständeIt is advantageous to shorten the time until all heating resistors are switched on

ohne Oberschreiten der zulässigen Einschaltstromstärke erreicht werden, wenn die zu Beginn des Trockenprogrammes noch nicht eingeschalteten PTC-Widerstände vom erwärmten Trockenluftstrom beaufschlagt und dadurch vorgewärmt werden. Ein Vorwärmen der zuzuschaltenden PTC-Widerstände ist auch dadurch möglich, daß diese Widerstände in Wärmekontakt mit den bereits beheizten PTC-Widerständen stehen.without exceeding the permissible inrush current can be achieved if the PTC resistors are not yet switched on at the start of the drying program acted upon by the heated dry air flow and thereby preheated. Preheating the PTC resistors to be switched on are also possible in that these resistors are in thermal contact with the already heated PTC resistors.

Bei Wäschetrocknern mit elektronischer Trocknersteuerung wird den später einzuschaltenden PTC-Widerständen beispielsweise ein Thermofühler oder Bimetall zugeordnet, welche nach Erreichen einer vorgegebenen Temperatur diese Heizelemente an Spannung legen. Dabei ist es ebenfalls möglich, die nachzuschaltenden Heizelemente über den Trockenluftstrom oder durch die wirksamer Heizelemente vorzuheizen.In the case of tumble dryers with electronic dryer control, the PTC resistors to be switched on later For example, a thermal sensor or bimetal assigned, which after reaching a apply voltage to these heating elements at the specified temperature. It is also possible to use the downstream heating elements via the dry air flow or the more effective heating elements preheat.

Claims (3)

Patentansprüche:Patent claims: 1. Wäschetrockner mit einer über die Trocknersteuerung schaltbaren PTC-Widerstandsheizung, dadurch gekennzeichnet, daß die Heizung aus mehreren PTC-Widerständen (Kaltleitern) besteht, die so angeordnet sind, daß die PTC-Widerstände durch die Trocknersteuerung aus einer Serienschaltung zu Beginn des Troekenprogrammes zeit- oder temperaturabhängig in eine Paralle- oder Teilparallelschaltung umschaltbar sind.1. Tumble dryer with a PTC resistance heating switchable via the dryer control, characterized in that the heater consists of several PTC resistors (PTC thermistors), which are arranged so that the PTC resistors by the dryer control from a Series connection at the beginning of the drying program, depending on time or temperature, in a parallel or Partial parallel connection are switchable. Z Wäschetrockner mit einer über die Trocknersteuerung schaltbaren PTC-Widerstandsheizung, dadurch gekennzeichnet, daß die Heizung aus mehreren PTC-Widerständen (Kaltleitern) besteht, die in Parallelschaltung angeordnet sind, und daß zu Beginn des Trockenprogrammes durch die Trocknersteuerung nur so viele PTC-Widerstände an Spannung legbar sind, daß der Einschaltstrom unter einem Grenzwert liegt, und daß während des Trockenprogrammes weiiere PTC-Widersiände zeit- oder temperaturabhängig unter Berücksichtigung der zulässigen Stromspitze zuschaltbar sind.Z Tumble dryer with a PTC resistance heater that can be switched via the dryer control, characterized in that the heater consists of several PTC resistors (PTC thermistors), which are arranged in parallel, and that at the beginning of the drying program by the dryer control only so many PTC resistors can be connected to voltage that the inrush current falls below a limit value, and that during the drying program white PTC resistances Can be switched on depending on time or temperature, taking into account the permissible current peak. 3. Wäschetrockner nach Anspruch 2, dadurch gekennzeichnet, daß die während des Trockenprogrammes zuschaltbaren PTC-Widerstände in Wärmekontakt mit den bereits seit Prograrnmbeginn an Spannung liegenden PTC-Widerständen stehen oder durch den Trockenluftstrom vorheizbar sind.3. Clothes dryer according to claim 2, characterized in that the during the drying program Switchable PTC resistors in thermal contact with the ones that have been on since the start of the program Voltage-connected PTC resistors are or can be preheated by the dry air flow.
DE2653322A 1976-11-24 1976-11-24 Clothes dryer Expired DE2653322C2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE2653322A DE2653322C2 (en) 1976-11-24 1976-11-24 Clothes dryer
GB46814/77A GB1553145A (en) 1976-11-24 1977-11-10 Laundry drier
NL7712547A NL7712547A (en) 1976-11-24 1977-11-15 WASHER DRYER.
CH1406977A CH620723A5 (en) 1976-11-24 1977-11-17 Laundry drier
IT29947/77A IT1088287B (en) 1976-11-24 1977-11-23 DRYER WITH RESISTANCE DRYING AND HEATING WITH POSITIVE TEMPERATURE COEFFICIENT

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2653322A DE2653322C2 (en) 1976-11-24 1976-11-24 Clothes dryer

Publications (2)

Publication Number Publication Date
DE2653322A1 DE2653322A1 (en) 1978-06-01
DE2653322C2 true DE2653322C2 (en) 1982-04-22

Family

ID=5993843

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2653322A Expired DE2653322C2 (en) 1976-11-24 1976-11-24 Clothes dryer

Country Status (5)

Country Link
CH (1) CH620723A5 (en)
DE (1) DE2653322C2 (en)
GB (1) GB1553145A (en)
IT (1) IT1088287B (en)
NL (1) NL7712547A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022608C1 (en) * 2000-05-09 2001-10-25 Whirlpool Co Laundry dryer has positive temperature coefficient heating element in thermal contact with negative temperature coefficient heating element
DE10022613A1 (en) * 2000-05-09 2001-11-29 Whirlpool Co Condensation clothes dryer, has auxiliary resistance heater consisting one or more semiconductor resistors that heat coolant for heat pump circuit condenser

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2597222A1 (en) * 1986-04-11 1987-10-16 Ciapem Apparatus equipped with an electrical heating resistance

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51109556A (en) * 1975-03-24 1976-09-28 Hitachi Ltd

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022608C1 (en) * 2000-05-09 2001-10-25 Whirlpool Co Laundry dryer has positive temperature coefficient heating element in thermal contact with negative temperature coefficient heating element
DE10022613A1 (en) * 2000-05-09 2001-11-29 Whirlpool Co Condensation clothes dryer, has auxiliary resistance heater consisting one or more semiconductor resistors that heat coolant for heat pump circuit condenser
DE10022613C2 (en) * 2000-05-09 2002-04-25 Whirlpool Co Condensation dryer with heat pump and additional resistance heating

Also Published As

Publication number Publication date
NL7712547A (en) 1978-05-26
GB1553145A (en) 1979-09-19
IT1088287B (en) 1985-06-10
DE2653322A1 (en) 1978-06-01
CH620723A5 (en) 1980-12-15

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Legal Events

Date Code Title Description
OD Request for examination
8120 Willingness to grant licences paragraph 23
D2 Grant after examination
8363 Opposition against the patent
8339 Ceased/non-payment of the annual fee