EP1154066A2 - Wäschetrockner mit PTC Widerstandsheizung - Google Patents

Wäschetrockner mit PTC Widerstandsheizung Download PDF

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Publication number
EP1154066A2
EP1154066A2 EP01104872A EP01104872A EP1154066A2 EP 1154066 A2 EP1154066 A2 EP 1154066A2 EP 01104872 A EP01104872 A EP 01104872A EP 01104872 A EP01104872 A EP 01104872A EP 1154066 A2 EP1154066 A2 EP 1154066A2
Authority
EP
European Patent Office
Prior art keywords
ntc
ptc
heater
resistors
clothes dryer
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
EP01104872A
Other languages
English (en)
French (fr)
Other versions
EP1154066A3 (de
EP1154066B1 (de
Inventor
Reinhold c/o Whirlpool Europe s.r.l. Pöhler
Gismar c/o Whirlpool Europe s.r.l. Eck
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.)
Whirlpool Corp
Original Assignee
Whirlpool Corp
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 Whirlpool Corp filed Critical Whirlpool Corp
Publication of EP1154066A2 publication Critical patent/EP1154066A2/de
Publication of EP1154066A3 publication Critical patent/EP1154066A3/de
Application granted granted Critical
Publication of EP1154066B1 publication Critical patent/EP1154066B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/26—Heating arrangements, e.g. gas heating equipment

Definitions

  • the invention concerns a clothes dryer with a PTC resistance heater for the drying air that is conducted via a blower through the dryer drum.
  • the PTC resistor be preheated with an auxiliary heater.
  • the heater consist of several PTC resistors that are arranged so that they can be switched from a series-connection at the beginning of the drying program to parallel or partially-parallel-connection by the program control depending on the time or temperature. This increases the complexity of the program control, however.
  • the problem of the invention is to create a heater for a clothes dryer of the initially-cited type that independently reduces the starting current, automatically adapts to the operating conditions, and protects from overheating.
  • a line-side NTC heater consisting of at least one NTC resistor is series-connected to the PTC resistance heater, and at least one PTC resistor of the PTC resistance heater thermally contacts an NTC resistor of the line-side NTC heater.
  • the high cold resistance of the NTC resistors limits the starting current during the cold-start in the series-connection to the PTC resistors.
  • the overall resistance circuit of the NTC and PTC resistors automatically controls itself so that a controller is no longer necessary.
  • the resistance of the PTC resistors continues to decrease and prevents the heater from overheating so that an independent safety circuit is not required for overload protection.
  • the entire resistance heater contacts the hot drying air so that the overall resistance automatically adapts to the predominant operating conditions, and the PTC and NTC resistors that are in thermal contact with each other assume the regulatory function.
  • the overall heater contacts the drying air automatically since it is located in an air channel through which the drying air flows.
  • the line-side NTC heater limits the starting current in the cold-start phase by its temperature-related resistance characteristic, while in the heating phase, the PTC resistance heater limits the heating current by its temperature-related resistance characteristic and protects against overheating.
  • a simple electrical design of the overall heater is provided by joining the PTC resistors in the PTC resistance heater in a series-connection, parallel-connection or mixed connection, and joining the NTC resistors in the line-side NTC heater in series-connection, parallel-connection, or a mixed connection to obtain the desired resistance characteristic for all phases of the drying procedure.
  • the design is distinguished in that the PTC and NTC resistors are preferably designed as plates and electrically contact plate-shaped contact bodies and/or plate shaped cooling bodies with cooling ribs, and that the contact bodies and cooling bodies in the PTC resistance heater and line-side NTC heater contact the PTC resistors and NTC resistors corresponding to the overall heating system.
  • the thermal contact between the PTC resistance heater and line-side NTC heater is provided as follows: At least one PTC resistor electrically and thermally contacts a surface of at least one cooling body, and at least one NTC resistor electrically and thermally contacts the other surface.
  • Fig. 1 schematically illustrates a closed drying air circuit of a clothes dryer.
  • the clothes to be dried are put into the dryer drum 2 and then circulated by the rotating dryer drum 2.
  • the dryer drum 2 rotates on an axis 3.
  • the front of the dryer drum 2 is connected to an air channel 7 with a blower 4 that sucks the drying air from the dryer drum 2 and pushes it through a subsequent condenser 8. This cools and dehydrates the drying air.
  • the drying air passes through the air channel 9 and the following heating element 1 into the air channel 5 and then returns into the opposing side of the dryer drum 2. Then the dehydrated and heated drying air again absorbs evaporated moisture from the clothes 6 and is again fed through the drying air circuit.
  • an overall resistance heater consisting of NTC and PTC resistors is installed at the transition from air channel 9 to air channel 5.
  • This overall resistance heater 1 consists of a series-connected line-side NTC heater VH, and a PTC resistance heater WH.
  • the line-side NTC heater VH there are two NTC resistors NTC1 and NTC2 followed by two parallel-connected PTC resistors PTC1 and PTC2 or PTC3 and PTC4.
  • the phase L of an AC voltage is applied to a plate-shaped metal contact body KK.
  • the metal contact body KK is electrically and thermally connected to the two plate-shaped NTC resistors NTC1 and NTC2.
  • the NTC resistors NTC1 and NTC2 are electrically and thermally connected via plate-shaped metal cooling bodies K1 provided with cooling ribs to two PTC resistors PTC1 and PTC2, or PTC3 and PTC4.
  • the two PTC resistors PTC1 and PTC2 or PTC3 and PTC4 are electrically parallel-connected.
  • the metal cooling bodies K2 are connected to the zero pole N of the AC voltage.
  • the two metal cooling bodies K1 and K2 can also be connected to each other in an electrically conductive manner so that the two NTC resistors NTC1 and NTC2 are also parallel-connected.
  • Several parallel-connected NTC resistors that are electrically and thermally connected can also be between the metal contact bodies KK and the metal cooling body/bodies K1.
  • More than two parallel-connected PTC resistors can also be between the metal cooling bodies K1 and K2.
  • the resistance characteristic of the overall resistance circuit can hence be optimally adapted to conditions during a cold-start and heating, and the resistance characteristic can be adapted as desired by selecting the NTC and PTC resistors with their associated characteristics.
  • the circuit diagram to the overall resistance circuit 1 consisting of the NTC and PTC resistors can be varied and used to attain the desired resistance characteristics.
  • the overall resistance heater 1 is installed in the air channel LK between sections 9 and 5. Phase L of the AC voltage is applied to a metal contact body KK.
  • the single NTC resistor functions as a line-side NTC heater VH that has electrically an direct thermal contact with another metal contact body KK1.
  • the NTC and PTC resistors are mutually heated via their thermal connection.
  • the geometric arrangement of the heater in Fig. 4 reduces the voltage difference between the metal contact bodies KK and KK1 as well as metal cooling bodies K1, K2, Kn and the surrounding air channel LK as can be seen from the circuit diagram in Fig. 5 in which the connecting points of resistors are provided with corresponding references.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP01104872A 2000-05-09 2001-02-28 Wäschetrockner mit PTC Widerstandsheizung Expired - Lifetime EP1154066B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10022608 2000-05-09
DE10022608A DE10022608C1 (de) 2000-05-09 2000-05-09 Wäschetrockner mit einer PTC-Widerstandsheizung

Publications (3)

Publication Number Publication Date
EP1154066A2 true EP1154066A2 (de) 2001-11-14
EP1154066A3 EP1154066A3 (de) 2002-10-16
EP1154066B1 EP1154066B1 (de) 2003-12-17

Family

ID=7641339

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01104872A Expired - Lifetime EP1154066B1 (de) 2000-05-09 2001-02-28 Wäschetrockner mit PTC Widerstandsheizung

Country Status (3)

Country Link
EP (1) EP1154066B1 (de)
DE (2) DE10022608C1 (de)
ES (1) ES2211677T3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1154065A3 (de) * 2000-05-09 2002-10-16 Whirlpool Corporation Kondensationwäschetrockner mit Wärmepumpe und zusätzlicher Widerstandheizung
WO2004042132A3 (en) * 2002-11-07 2004-06-10 Irca Spa Conduit with improved electric heating element and clothes drying machine provided with such a conduit
CN117188123A (zh) * 2022-05-31 2023-12-08 无锡小天鹅电器有限公司 衣物处理设备及衣物处理设备的控制方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050101660A (ko) * 2004-04-19 2005-10-25 엘지전자 주식회사 건조겸용 드럼세탁기
DE102020103796A1 (de) 2020-02-13 2021-08-19 Miele & Cie. Kg Trockner

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51109556A (de) * 1975-03-24 1976-09-28 Hitachi Ltd
DE2653322C2 (de) * 1976-11-24 1982-04-22 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Wäschetrockner
JP2722701B2 (ja) * 1989-08-23 1998-03-09 松下電器産業株式会社 衣類乾燥機
DE10022613C2 (de) * 2000-05-09 2002-04-25 Whirlpool Co Kondensations-Wäschetrockner mit Wärmepumpe und Zusatz-Widerstandsheizung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1154065A3 (de) * 2000-05-09 2002-10-16 Whirlpool Corporation Kondensationwäschetrockner mit Wärmepumpe und zusätzlicher Widerstandheizung
WO2004042132A3 (en) * 2002-11-07 2004-06-10 Irca Spa Conduit with improved electric heating element and clothes drying machine provided with such a conduit
CN117188123A (zh) * 2022-05-31 2023-12-08 无锡小天鹅电器有限公司 衣物处理设备及衣物处理设备的控制方法

Also Published As

Publication number Publication date
DE10022608C1 (de) 2001-10-25
EP1154066A3 (de) 2002-10-16
ES2211677T3 (es) 2004-07-16
EP1154066B1 (de) 2003-12-17
DE60101500D1 (de) 2004-01-29
DE60101500T2 (de) 2004-10-14

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