EP2025800B1 - Electric household appliance - Google Patents

Electric household appliance Download PDF

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Publication number
EP2025800B1
EP2025800B1 EP07114481.0A EP07114481A EP2025800B1 EP 2025800 B1 EP2025800 B1 EP 2025800B1 EP 07114481 A EP07114481 A EP 07114481A EP 2025800 B1 EP2025800 B1 EP 2025800B1
Authority
EP
European Patent Office
Prior art keywords
electric
rotation direction
laundry
household appliance
laundry drum
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.)
Active
Application number
EP07114481.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2025800A1 (en
Inventor
Silvano Cimetta
Simone Sacilotto
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.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
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 Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to EP07114481.0A priority Critical patent/EP2025800B1/en
Priority to EP16164403.4A priority patent/EP3106560B1/en
Priority to RU2008133789/12A priority patent/RU2471027C2/ru
Publication of EP2025800A1 publication Critical patent/EP2025800A1/en
Application granted granted Critical
Publication of EP2025800B1 publication Critical patent/EP2025800B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
    • D06F58/04—Details 
    • D06F58/08—Driving arrangements
    • 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
    • D06F2103/38—Time, e.g. duration
    • 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
    • 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
    • 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof
    • 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 present invention relates to an electric household appliance.
  • the present invention relates to an electric household appliance corresponding to a home washing machine with a laundry drying device, or to a home laundry tumble drier, to which the following description refers purely by way of example.
  • home tumble driers substantially comprise a parallelepiped-shaped casing; a cylindrical laundry drying tub or chamber fixed horizontally inside the casing, directly facing a laundry loading/unloading opening formed in the front face of the casing; a door hinged to the front face of the casing to rotate to and from a work position closing the opening in the front face to seal the drying tub; a cylindrical, perforated-wall laundry drum housed to rotate axially inside the drying tub; and an electric motor for rotating the laundry drum about its longitudinal axis inside the drying tub.
  • Tumble driers of the above type also comprise a hot-air generator designed to circulate inside the drying tub a stream of hot, low-moisture air, which, as it flows through the laundry drum, flows over and rapidly dries the laundry inside the drum.
  • the drier comprises a hot-air generator, in turn comprising a drying circuit connected to the drying tub; a heating element, normally defined by a single electric resistor located along the drying circuit to heat the air before it is fed into the drying tub; and a ventilation device, comprising an intake fan rotated by the electric motor to circulate the air inside the drying circuit.
  • Patent Application EP1564324A1 filed by the present Applicant, describes a drier featuring a memory containing various "normal” user-selectable drying programs, each of which controls the motor to rotate the fan and the drum at sufficiently high predetermined drying speeds; and a user-selectable "night drying program", which operates the fan and the drum at "low” rotation speed, i.e. lower than the "normal” drying program drying speeds, to reduce the noise level of the fan and drum.
  • Patent Application EP1564324A1 has various drawbacks. Reducing the rotation speed of the drum with respect to the normal drying program drying speeds, in fact, results in poor distribution of the laundry inside the drum, which tends to form into a ball, thus resulting, on the one hand, in uneven drying of the laundry on the inside, and, on the other, in overheating of the laundry on the outside.
  • DE 3820815 discloses a drum dryer in which laundry circulates due to a rotation of the washing drum which is operated conjointly with a process air blower and through which hot process air flows, the laundry may be circulated in a first drying section in alternate directions or alternatively only in one direction in which the blower operates at full load and be subjected to a flow of very hot process air in that one direction.
  • the operator has the choice if large laundry articles are to be dried to prevent entanglement of the wash by alternating the direction of rotation of the drum while on the other hand, if small laundry articles are to be dried, to reduce the drying time and the energy consumption by using only one direction of rotation of the drum.
  • an electric household appliance as claimed in Claim 1 and, preferably, though not necessarily, in any one of the Claims depending directly or indirectly on Claim 1.
  • Number 1 in Figure 1 indicates as a whole an electric household appliance preferably corresponding to a home laundry drier, which substantially comprises a preferably, though not necessarily, parallelepiped-shaped casing 2; a laundry drum 3, which houses the laundry for drying, and is housed in axially rotating manner inside casing 2, in a preferably, though not necessarily horizontal position, directly facing a laundry loading/unloading opening 2a formed in the front face of casing 2; a door 4 hinged to the front face of casing 2 to rotate to and from a work position closing opening 2a in the front face to seal laundry drum 3; and a preferably, though not necessarily, open-circuit hot-air generator 5 housed inside casing 2 and designed to circulate inside laundry drum 3 a stream of hot, low-moisture air, which flows over and rapidly dries the laundry inside the drum.
  • Drier 1 also comprises at least an electric motor 7 preferably a variable velocity rotation motor or similar for rotating laundry drum 3 about its longitudinal axis L, preferably, though not necessarily, inside a drying tub 6 housed inside casing 2.
  • longitudinal axis L coincides with the longitudinal axis L of drying tub 6.
  • hot-air generator 5 gradually draws air in from outside laundry drum 3; heats the intake air to a predetermined temperature; and draws the moisture-laden air out of laundry drum 3.
  • hot-air generator 5 continuously draws in, heats, and feeds outside air into laundry drum 3 to rapidly dry the laundry inside the drum, and exhausts the moisture-laden air from laundry drum 3 to the outside.
  • hot-air generator 5 comprises an air intake manifold 8 having a first end connected to the rear wall of laundry drum 3, and a second end connected to an air intake 9 formed preferably, though not necessarily, in casing 2; an electric heating device 10 located preferably, though not necessarily, along intake manifold 8 to heat the airflow through intake 9; an exhaust manifold 11 connecting laundry drum 3 to an exhaust outlet 12 in a wall of casing 2; and a centrifugal fan 13 located preferably, though not necessarily, along exhaust manifold 11 to produce, inside intake manifold 8 and exhaust manifold 11, a stream of air which flows through laundry drum 3 and over the laundry inside the drum, and is then exhausted to the outside.
  • an air intake manifold 8 having a first end connected to the rear wall of laundry drum 3, and a second end connected to an air intake 9 formed preferably, though not necessarily, in casing 2
  • an electric heating device 10 located preferably, though not necessarily, along intake manifold 8 to heat the airflow through intake 9
  • an exhaust manifold 11 connecting laundry drum
  • Centrifugal fan 13 is connected by a transmission mechanism (shown by the dash line) to electric motor 7, which rotates both fan 13 and laundry drum 3 about their respective axes of rotation.
  • heating device 10 comprises two or more passive electric components 15, which dissipate electric power by Joule effect to heat the air supply to laundry drum 3; and a control module 16 for controlling passive electric components 15 to regulate the energy dissipated by passive electric components 15 in the form of heat by Joule effect.
  • control module 16 controls electric motor 7 to rotate laundry drum 3 in a first rotation direction D1 or a second rotation direction D2 opposite first rotation direction D1, and controls passive electric components 15 to regulate the electric power P E dissipated by passive electric components 15 in the form of heat, so that the temperature t of the air heated by passive electric components 15 assumes a first value t 1 when laundry drum 3 is rotated in the first rotation direction D1, or a second value t 2 , different from first value t 1 , when laundry drum 3 is rotated in the second rotation direction D2.
  • passive electric components 15 of heating device 10 comprise resistors 15 series- or parallel-connected to one another between two electric power lines 18 at respective reference voltages; and control module 16 comprises a number of switching devices 19, each interposed between one of the two power lines 18 and a respective resistor 15.
  • heating device 10 comprises two resistors 15, each connected to a power line 18 via a respective switching device 19. More specifically, the two resistors 15 may have different resistances, e.g. one of the two resistors 15 may have a higher resistance than the other.
  • Drier 1 also comprises an electronic control unit 20, which controls electric motor 7 to vary the rotation speed v and/or the rotation direction D of the drive shaft 7a of the motor, and controls control module 16 to regulate the energy dissipated by resistors 15 and so vary the heat produced and, hence, the temperature t of the air supply to drum 3.
  • an electronic control unit 20 which controls electric motor 7 to vary the rotation speed v and/or the rotation direction D of the drive shaft 7a of the motor, and controls control module 16 to regulate the energy dissipated by resistors 15 and so vary the heat produced and, hence, the temperature t of the air supply to drum 3.
  • electronic control unit 20 comprises a memory unit 21 containing a number of user-selectable drying programs, each comprising information indicating: total drying cycle time DT; the rotation speed/s v of drum 3 during the drying cycle; and the electric power supply P E to resistors 15.
  • the drying programs comprise at least one "low-noise drying program" containing the following parameters : total drying program time DT; rotation time/s of motor 7 in a first rotation direction D1; rotation time/s of motor 7 in a second rotation direction D2 opposite to said first rotation direction D1; rotation speed v1 of motor 7 in the first rotation direction D1; and rotation speed v2 of motor 7 in the second rotation direction D2.
  • Drier 1 also comprises an interface unit 22, which allows the user to select the low-noise drying program from the various memorized drying programs, and so transmit a signal to electronic control unit 20 to commence drying the laundry in accordance with the low-noise program.
  • the first configuration of switching devices 19 activated by control unit 20 may comprise closing a first switching device 19 to power a first resistor 15, and opening a second switching device 19 to zero heat generation by the second resistor 15; and the second configuration of switching devices 19 may comprise closing the second switching device 19 to power the second resistor 15, and opening the first switching device 19 to zero Joule heat generation by the first resistor 15.
  • the change in the rotation direction of drum 3 in the low-noise drying program conveniently prevents balling of the laundry, by distributing it on the inner wall of drum 3 and so enabling uniform drying; while the reduction in Joule heat generated as the drum rotates in second rotation direction D2, i.e. after the laundry is distributed on the inner wall of laundry drum 3, reduces the air temperature t2 ⁇ t1, and so greatly reduces the risk of overheating the laundry inside drum 3.
  • the low-noise drying cycle may either terminate the drying cycle or repeat the above steps, i.e. alternate rotation directions D1 and D2 and/or relative rotation speeds v1 and v2 of motor 7 for predetermined times ⁇ Ti.
  • the drier as described above is extremely advantageous, by not only ensuring a low noise level, but also preventing balling and, at the same time, overheating and possible damage, of the laundry.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP07114481.0A 2007-08-17 2007-08-17 Electric household appliance Active EP2025800B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP07114481.0A EP2025800B1 (en) 2007-08-17 2007-08-17 Electric household appliance
EP16164403.4A EP3106560B1 (en) 2007-08-17 2007-08-17 Electric household appliance
RU2008133789/12A RU2471027C2 (ru) 2007-08-17 2008-08-15 Бытовой электрический прибор

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07114481.0A EP2025800B1 (en) 2007-08-17 2007-08-17 Electric household appliance

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP16164403.4A Division EP3106560B1 (en) 2007-08-17 2007-08-17 Electric household appliance
EP16164403.4A Previously-Filed-Application EP3106560B1 (en) 2007-08-17 2007-08-17 Electric household appliance

Publications (2)

Publication Number Publication Date
EP2025800A1 EP2025800A1 (en) 2009-02-18
EP2025800B1 true EP2025800B1 (en) 2016-04-13

Family

ID=38926399

Family Applications (2)

Application Number Title Priority Date Filing Date
EP16164403.4A Active EP3106560B1 (en) 2007-08-17 2007-08-17 Electric household appliance
EP07114481.0A Active EP2025800B1 (en) 2007-08-17 2007-08-17 Electric household appliance

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP16164403.4A Active EP3106560B1 (en) 2007-08-17 2007-08-17 Electric household appliance

Country Status (2)

Country Link
EP (2) EP3106560B1 (ru)
RU (1) RU2471027C2 (ru)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008019921A1 (de) 2008-04-21 2009-10-22 BSH Bosch und Siemens Hausgeräte GmbH Hausgerät zur Trocknung von Wäschestücken und Verfahren zum Betreiben eines derartigen Hausgeräts
PL2519673T3 (pl) * 2009-12-31 2014-05-30 Arcelik As Pralka z zabezpieczeniem przed przeciążeniem silnika

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1585938A1 (de) * 1963-01-18 1969-09-18 Siemens Elektrogeraete Gmbh Nach dem Trommelprinzip arbeitender Waeschetrockner
US3309783A (en) * 1964-03-09 1967-03-21 Gen Electric Clothes drying machine having reversing drum drive means
GB2051330A (en) * 1979-06-15 1981-01-14 Philips Electronic Associated Clothes dryer
DE3820815A1 (de) * 1988-06-20 1989-12-21 Bosch Siemens Hausgeraete Verfahren zum trocknen von waeschestuecken in einem trommeltrockner und hierzu geeigneter trommeltrockner
RU2089691C1 (ru) * 1995-02-03 1997-09-10 Государственное предприятие "Завод им.Я.М.Свердлова" Способ стирки белья в стиральных машинах барабанного типа
EP1564324A1 (en) * 2004-02-10 2005-08-17 Electrolux Home Products Corporation N.V. Variable speed low-noise household clothes drying machine
EP1568817B1 (en) * 2004-02-25 2008-07-23 CANDY S.p.A. Laundry drier

Also Published As

Publication number Publication date
EP3106560A1 (en) 2016-12-21
EP2025800A1 (en) 2009-02-18
EP3106560B1 (en) 2018-06-06
RU2471027C2 (ru) 2012-12-27
RU2008133789A (ru) 2010-02-20

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