EP0771899B1 - Method of drying articles of washing in a drum washing drier - Google Patents

Method of drying articles of washing in a drum washing drier Download PDF

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Publication number
EP0771899B1
EP0771899B1 EP96115094A EP96115094A EP0771899B1 EP 0771899 B1 EP0771899 B1 EP 0771899B1 EP 96115094 A EP96115094 A EP 96115094A EP 96115094 A EP96115094 A EP 96115094A EP 0771899 B1 EP0771899 B1 EP 0771899B1
Authority
EP
European Patent Office
Prior art keywords
rotation
phase
process air
drum
forward direction
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 - Lifetime
Application number
EP96115094A
Other languages
German (de)
French (fr)
Other versions
EP0771899A3 (en
EP0771899A2 (en
Inventor
Thomas c/o Whirlpool Europe s.r.l. Zerrer
Susanne c/o Whirlpool Europe s.r.l. Hoersch
Luise c/o Whirlpool Europe s.r.l. Chirstmann
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 EP0771899A2 publication Critical patent/EP0771899A2/en
Publication of EP0771899A3 publication Critical patent/EP0771899A3/en
Application granted granted Critical
Publication of EP0771899B1 publication Critical patent/EP0771899B1/en
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
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/50—Control of washer-dryers characterised by the purpose or target of the control
    • D06F33/70—Control of the operating time, e.g. reduction of overall operating time
    • 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
    • D06F2103/28—Air properties
    • D06F2103/34—Humidity
    • 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
    • D06F2103/28—Air properties
    • D06F2103/36—Flow or velocity
    • 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
    • D06F2103/44—Current 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
    • 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
    • D06F2105/16—Air properties
    • D06F2105/24—Flow or velocity
    • 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
    • D06F2105/30—Blowers
    • 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
    • D06F2105/36—Condensing arrangements, e.g. control of water injection therefor
    • 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
    • D06F2105/52—Changing sequence of operational steps; Carrying out additional operational steps; Modifying operational steps, e.g. by extending duration of steps
    • 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
    • D06F25/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and having further drying means, e.g. using hot air 
    • 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
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity
    • 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
    • D06F58/46—Control of the operating time

Definitions

  • the invention relates to a method of drying articles of washing in a drum washing drier, in which the articles of washing are circulated by rotary movements of the drum, the drum being driven in common with a process air blower in the same or alternating directions of rotation, and having heated process air flowing therethrough, the air output of the process air blower being increased in the forward direction of rotation and being reduced in the reverse direction of rotation, the drying procedure including three phases - start phase, main drying phase and final phase - the temperature in the circuit of process air being detected, and the process air blower and a drum being permanently driven in the forward direction of rotation during the start phase.
  • a method of this type is known from EP 0 358 849 B1.
  • the main drying phase begins only when a temperature approaching the predetermined drying temperature (e.g. 60°C) is reached, operation then being basically with alternating directions of rotation or, by means of selection by the person operating, it is determined whether operation is to be exclusively in the forward direction of rotation or with alternating directions of rotation.
  • a temperature approaching the predetermined drying temperature e.g. 60°C
  • the object of the invention is to provide a method of the type already mentioned in which the time spent in reverse operation during the drying procedure is reduced to a minimum and thus the drying time of the drying procedure is shortened, and the life-expectancy of the drum washing drier is increased.
  • This object is achieved according to the invention in that, during the main drying phase, operation is switched over for a period from the forward direction of rotation to alternating directions of rotation (reversing) only when a predetermined maximum temperature is reached, the period of time being predetermined or terminated when a predetermined minimum temperature is reached, and in that, in the final phase, operation is with alternating directions of rotation, or in that, when there is a condenser in the process air circuit, the temperature differential is measured at the condenser, in that, during the main drying phase, the drum and the process air blower are switched over for a period from the forward direction of rotation to alternating directions of rotation when a maximum temperature differential is reached, the alternating directions of rotation being terminated when a predetermined minimum temperature differential is reached, and in that, in the final phase, operation is optionally in the forward direction of rotation or with alternating directions of rotation.
  • operation during the main drying phase is substantially only in the forward direction.
  • the predetermined maximum temperature or temperature differential is only reached if the drum is improperly loaded, which for example can be caused by overloading or the introduction of a plurality of large towelling articles.
  • Proper loading according to DIN or IEC therefore leads as a rule to no reverse operation during the main drying phase, so that a frequency of switching of the control contacts occurs only in exceptional cases.
  • the times for the start phase, the main drying phase and the final phase can be constantly predetermined or also adjustable.
  • the temperature in the process air circuit is measured, this is preferably effected after it has passed through the drum, in the air duct of the process air circuit.
  • the diagram in Fig. 1 gives the temperature curve of a drying procedure in dependence on the running time of the drum washing drier, the extended curve showing the normal situation.
  • drum and process air blower are operated in the forward direction of rotation, i.e. the direction of rotation with the increased air output can increase the temperature during the main drying phase and reach or exceed a predetermined maximum value.
  • Operation is then switched to reverse, in fact only for a predetermined period, as Fig.1 shows, or this period continues until, due to reverse operation, the temperature has dropped to a predetermined maximum value, or falls below it.
  • For the remaining time in the main drying phase operation is switched back to the forward direction of rotation.
  • the final phase which, like the start phase, is considerably shorter than the main drying phase, operation is switched to reverse.
  • the diagram in Fig.2 shows the drying procedure in which the temperature differential is detected at the condenser of a process air circuit.
  • monitoring is undertaken to see whether the temperature differential reaches or exceeds a predetermined maximum value.
  • operation is switched to reverse, until the temperature differential has again dropped to a predetermined minimum value. Thereafter operation continues in the forward direction with high air output.
  • operation is optionally in the forward direction of rotation or in reverse with alternating directions of rotation. In this respect reverse operation can proceed with a strictly predetermined switching cycle.
  • the choice of operation in the final phase may be effected by the person operating or by measurement of a predetermined parameter which indicates the degree of drying.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)

Description

  • The invention relates to a method of drying articles of washing in a drum washing drier, in which the articles of washing are circulated by rotary movements of the drum, the drum being driven in common with a process air blower in the same or alternating directions of rotation, and having heated process air flowing therethrough, the air output of the process air blower being increased in the forward direction of rotation and being reduced in the reverse direction of rotation, the drying procedure including three phases - start phase, main drying phase and final phase - the temperature in the circuit of process air being detected, and the process air blower and a drum being permanently driven in the forward direction of rotation during the start phase.
  • A method of this type is known from EP 0 358 849 B1. In this known method the main drying phase begins only when a temperature approaching the predetermined drying temperature (e.g. 60°C) is reached, operation then being basically with alternating directions of rotation or, by means of selection by the person operating, it is determined whether operation is to be exclusively in the forward direction of rotation or with alternating directions of rotation.
  • As the main drying phase as a rule takes up the major proportion of the drying time, there results in the drying procedure a considerable period during which the machine operates with alternating directions of rotation. Long periods of reverse operation however involve an increase in the drying time and of the frequency of switching of the switch contacts, leading to a reduction in the life-expectancy of the drum washing drier.
  • The object of the invention is to provide a method of the type already mentioned in which the time spent in reverse operation during the drying procedure is reduced to a minimum and thus the drying time of the drying procedure is shortened, and the life-expectancy of the drum washing drier is increased.
  • This object is achieved according to the invention in that, during the main drying phase, operation is switched over for a period from the forward direction of rotation to alternating directions of rotation (reversing) only when a predetermined maximum temperature is reached, the period of time being predetermined or terminated when a predetermined minimum temperature is reached, and in that, in the final phase, operation is with alternating directions of rotation, or in that, when there is a condenser in the process air circuit, the temperature differential is measured at the condenser, in that, during the main drying phase, the drum and the process air blower are switched over for a period from the forward direction of rotation to alternating directions of rotation when a maximum temperature differential is reached, the alternating directions of rotation being terminated when a predetermined minimum temperature differential is reached, and in that, in the final phase, operation is optionally in the forward direction of rotation or with alternating directions of rotation.
  • In this method, operation during the main drying phase is substantially only in the forward direction. The predetermined maximum temperature or temperature differential is only reached if the drum is improperly loaded, which for example can be caused by overloading or the introduction of a plurality of large towelling articles. Proper loading according to DIN or IEC therefore leads as a rule to no reverse operation during the main drying phase, so that a frequency of switching of the control contacts occurs only in exceptional cases.
  • The times for the start phase, the main drying phase and the final phase, depending on the embodiment, can be constantly predetermined or also adjustable.
  • If the temperature in the process air circuit is measured, this is preferably effected after it has passed through the drum, in the air duct of the process air circuit.
  • The invention will now be explained in more detail with reference to embodiments given by way of example and illustrated in the drawings, which show:
    • Fig. 1:
    a diagram of the drying procedure on the basis of a temperature measurement in the process air circuit, and
    Fig.2:
    a diagram of the drying procedure on the basis of a temperature differential at the condenser of a process air circuit.
  • The diagram in Fig. 1 gives the temperature curve of a drying procedure in dependence on the running time of the drum washing drier, the extended curve showing the normal situation. As the operating state of drum and process air blower, given under the diagram, shows, no reversing takes place during the start and main drying phases, i.e. drum and process air blower are operated in the forward direction of rotation, i.e. the direction of rotation with the increased air output can increase the temperature during the main drying phase and reach or exceed a predetermined maximum value. Operation is then switched to reverse, in fact only for a predetermined period, as Fig.1 shows, or this period continues until, due to reverse operation, the temperature has dropped to a predetermined maximum value, or falls below it. For the remaining time in the main drying phase operation is switched back to the forward direction of rotation. In the final phase which, like the start phase, is considerably shorter than the main drying phase, operation is switched to reverse.
  • The diagram in Fig.2 shows the drying procedure in which the temperature differential is detected at the condenser of a process air circuit. During the main drying phase, monitoring is undertaken to see whether the temperature differential reaches or exceeds a predetermined maximum value. Then operation is switched to reverse, until the temperature differential has again dropped to a predetermined minimum value. Thereafter operation continues in the forward direction with high air output. In the final phase operation is optionally in the forward direction of rotation or in reverse with alternating directions of rotation. In this respect reverse operation can proceed with a strictly predetermined switching cycle. The choice of operation in the final phase may be effected by the person operating or by measurement of a predetermined parameter which indicates the degree of drying.

Claims (5)

  1. Method of drying articles of washing in a drum washing drier, in which the articles of washing are circulated by rotary movements of the drum, the drum being driven in common with a process air blower in the same or alternating directions of rotation, and having heated process air flowing therethrough, the air output of the process air blower being increased in the forward direction of rotation and being reduced in the reverse direction of rotation, the drying procedure including three phases - start phase, main drying phase and final phase - and the temperature in the circuit of process air being detected, and the process air blower and a drum being permanently driven in the forward direction of rotation during the start phase,
    characterised in that,
    during the main drying phase, operation is switched over for a period from the forward direction of rotation to alternating directions of rotation (reversing) only when a predetermined maximum temperature is reached, the period of time being predetermined or terminated when a predetermined minimum temperature is reached,
    and in that, in the final phase, operation is with alternating directions of rotation.
  2. Method according to claim 1,
    characterised in that,
    when there is a condenser in the process air circuit, the temperature differential is measured at the condenser, in that , during the main drying phase, the drum and the process air blower are switched over for a period from the forward direction of rotation to alternating directions of rotation when a maximum temperature differential is reached, the alternating directions of rotation being terminated when a predetermined minimum temperature differential is reached, and in that, in the final phase, operation is optionally in the forward direction of rotation or with alternating directions of rotation.
  3. Method according to claim or 2,
    characterised in that
    the times for the start phase, the main drying phase and the final phase are constant and predetermined.
  4. Method according to claim or 2,
    characterised in that
    the times for the start phase, the main drying phase and the final phase are adjustable for the drying procedure.
  5. Method according to one of claims 1, 3 or 4,
    characterised in that
    the temperature in the process air circuit is measured after the drum.
EP96115094A 1995-10-20 1996-09-20 Method of drying articles of washing in a drum washing drier Expired - Lifetime EP0771899B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19539155A DE19539155C1 (en) 1995-10-20 1995-10-20 Clothes tumble dryer more durable by minimised alternating drum motion
DE19539155 1995-10-20

Publications (3)

Publication Number Publication Date
EP0771899A2 EP0771899A2 (en) 1997-05-07
EP0771899A3 EP0771899A3 (en) 1998-10-14
EP0771899B1 true EP0771899B1 (en) 2002-04-03

Family

ID=7775392

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96115094A Expired - Lifetime EP0771899B1 (en) 1995-10-20 1996-09-20 Method of drying articles of washing in a drum washing drier

Country Status (2)

Country Link
EP (1) EP0771899B1 (en)
DE (2) DE19539155C1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3820815A1 (en) * 1988-06-20 1989-12-21 Bosch Siemens Hausgeraete METHOD FOR DRYING LAUNDRY PIECES IN A DRUM DRYER AND DRUM DRYER SUITABLE FOR THIS
DE4032079C2 (en) * 1990-10-10 1999-03-04 Aeg Hausgeraete Gmbh Process for drying laundry in a program-controlled drum dryer

Also Published As

Publication number Publication date
DE69620341T2 (en) 2002-11-07
DE69620341D1 (en) 2002-05-08
EP0771899A3 (en) 1998-10-14
EP0771899A2 (en) 1997-05-07
DE19539155C1 (en) 1997-01-23

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