EP3562983A1 - A washer-dryer comprising dry friction damper - Google Patents

A washer-dryer comprising dry friction damper

Info

Publication number
EP3562983A1
EP3562983A1 EP17821476.3A EP17821476A EP3562983A1 EP 3562983 A1 EP3562983 A1 EP 3562983A1 EP 17821476 A EP17821476 A EP 17821476A EP 3562983 A1 EP3562983 A1 EP 3562983A1
Authority
EP
European Patent Office
Prior art keywords
coil
washer
dryer
cylinder
friction member
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.)
Withdrawn
Application number
EP17821476.3A
Other languages
German (de)
French (fr)
Inventor
Yunus Emre AYDOGDU
Ergin METIN
Bugra CETINKAYA
Salih YILDIRIM
Servet CATALTEPE
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.)
Arcelik AS
Original Assignee
Arcelik AS
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 Arcelik AS filed Critical Arcelik AS
Publication of EP3562983A1 publication Critical patent/EP3562983A1/en
Withdrawn legal-status Critical Current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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations

Definitions

  • the present invention relates to a washer-dryer comprising dampers damping the vibrational motions of the tub.
  • the tub in which laundry is loaded into the drum rotating within makes oscillation and vibration motions depending on the load and the number of revolutions during operation.
  • the tub is generally connected from its bottom to the base by means of dampers, and the dampers serve in reducing the transmission of the vibrations of the tub by damping them, and also acts as an energy transmission path transmitting the vibrations to the body.
  • the tub and the drive group make vibrational motions of maximum amplitude at the resonance frequency zone, when the washing machine shifts from the washing step to the spinning step.
  • the dampers prevent the tub from colliding into the body by damping vibrations of high amplitudes.
  • the vibration amplitude decreases and the damper whose friction forces are adjusted according to vibrations of high amplitudes, transmit the vibrations of lower amplitudes to the body generally without damping when a single-acting damper is being used.
  • Single-acting dry friction dampers exhibit the same effect in all vibration amplitudes, i.e. all displacements of the damper cylinder with respect to the piston. Almost all of the kinetic energy of the actuation group and the tub is transmitted to the body, generating noises upsetting the user, particularly when shifting from the washing revolutions to the spinning revolutions, and from the spinning revolutions to the washing revolutions, i.e. in the resonance zone.
  • dampers damping a higher amount of energy is needed due to increasing user demands for damping vibrations of both higher and lower amplitudes, and to wash laundry with a higher capacity.
  • Double-acting, electronic or hydraulic dampers are used to meet such demand, but they have higher costs.
  • Patent applications no. US2006010935 (A1) and US2005188472 (A1) relate to a damper utilizing magnetic forces and a washing machine having said damper.
  • the aim of the present invention is to realize a washer-dryer comprising dampers damping vibrational motions of higher and lower amplitudes of the tub and utilizing magnetic forces.
  • the damper used to damp the vibrational motion of the tub comprises a coil wrapped on the outer surface of the cylinder, applying magnetic field to the inner region of the cylinder upon being supplied with electric current by means of a power source, and a core acting as an electromagnet by being polarized in the radial direction by the action of the applied magnetic field.
  • the damper is of the dry friction type, and comprises a friction member fixed to the inner surface of the cylinder and contacting all around the piston, and permanent magnets placed all around the friction member, polarized in the radial direction, placed to the inner side of the core so that their identical poles face each other, and enabling the friction member to throttle the piston by pushing the friction member in radial direction according to the current passed through the coil and the magnitude of the magnetic field applied by the core.
  • the washer-dryer further comprises a control unit detecting the vibration amplitude of the tub during operation, and enabling applying current to the coil by means of the power source and applying pressure to the piston by the magnets pushing the friction member in radial direction from outside to inside, upon the vibration amplitude exceeding a predetermined top critical value.
  • the damping effect of the damper is increased in the periods of shifting from the washing revolutions to the spinning revolutions, or from the spinning revolutions to the washing revolutions.
  • the oscillation amplitudes of the tub decrease and the damping effect of the damper is reduced.
  • the damping affect can be modified by the current applied to the coil by the power source, and different damping effects are applied in accordance with each different oscillation amplitude.
  • the magnets apply pressure to the friction member in radial direction, the friction member throttles the piston all around by narrowing when the damping effect is increased, and a compact damper structure is thus obtained.
  • Figure 1 is a schematic view of a washer-dryer.
  • Figure 2 is a frontal view of a dry friction damper.
  • Figure 3 is a view of the A-A section of figure 2.
  • Figure 4 is a view of the detail C of figure 3.
  • Figure 5 is a view of the B-B section of figure 2.
  • the washer-dryer (1) comprises a drum (2) in which laundry is placed, a tub (3) making vibration (or oscillation) motion during operation by the action of the drum (2) rotating within, and a damper (6) damping the vibrational motion of the tub (3), having a cylinder (4) whose one end is connected to the tub (3), and a piston (5) whose one end is connected to the base, linearly moving in the cylinder (4).
  • the damper (6) of the invention comprises,
  • a coil (8) made of electrically conductive wire wrapped on the outer surface of the cylinder (4), and applying a magnetic field to the inner region of the cylinder (4) when supplied with electric current by a power source (7),
  • a friction member (10) having a ring shape, for example a mating ring preferably made of elastomer material fixed to the inner surface of the cylinder (4), contacting all around the piston (5), and
  • the damper (6) comprises a plurality of bar-shaped cores (9) arranged in the circumference of the cylinder (4) equally spaced all around the inner side of the coil (8), and a plurality of bar-shaped magnets (11) arranged in the circumference of the friction member (10) equally spaced and mutually with the cores (9).
  • the damper (6) comprises a ring shaped core (9) surrounding the cylinder (4) body at the inner side on the coil (8), and a ring shaped magnet (11) surrounding the friction member (10) nested and co-axially with the core (9).
  • the damper (6) further comprises a plastic shield (12) fitted around the coil (8) wrapped on the outer surface of the cylinder (4).
  • the washer-dryer (1) comprises a control unit (13) measuring the vibration amplitude of the tub (3) by means of displacement sensors or by another method, and enabling applying current to the coil (8) by means of the power source (7) and applying pressure to the piston (5) by the magnets (11) pushing the friction member (10) in radial direction from outside to inside, and increasing the friction force between the friction member (10) and the piston (5) and thus the damping effect of the damper (6), upon the vibration amplitude exceeding a predetermined top critical value.
  • the control unit (13) enables cutting the current applied from the power source (7) to the coil (8), and the friction member (10) applying no pressure to the piston (5) by deactivating the core (9) and thus magnet (11), upon the vibration amplitude of the tub (3) being lower than a predetermined base critical value.
  • the control unit (13) enables the power source (7) to apply the coil (8) currents of different values corresponding to different vibration amplitudes, the friction member (10) to apply pressure to the piston (5) according to each detected vibration amplitude, and increasing or decreasing the damping effect upon detecting vibration amplitudes between the predetermined base critical value and the top critical value.
  • the damping effect of the damper (6) is increased when the tub (3) oscillates with resonance frequency, particularly during shifting of the drum (2) from the washing revolutions to the spinning revolutions.
  • the damping effect of the damper (6) is reduced.
  • the damping affect can be modified by the current applied to the coil (8) by the power source (7), and different damping effects are applied in accordance with each different oscillation amplitude.
  • the damping effect can be modified so as to increase or decrease constantly instead of in steps, providing “smooth transitions” of the washer-dryer (1) from the washing revolutions to the spinning revolutions, or from the spinning revolutions to the washing revolutions.
  • the magnets (11) apply pressure to the friction member (10) in ‘’radial’’ direction from outside to inside, the friction member (10) throttles the piston (5) all around by “narrowing” when the damping effect is increased, and a compact damper (6) structure is thus obtained occupying less space.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)

Abstract

The present invention relates to a washer-dryer (1) comprising a drum (2) in which laundry is placed, a tub (3) making oscillation motion during operation by the action of the drum (2) rotating within, and a damper (6) damping the vibrational motion of the tub (3), having a cylinder (4) whose one end is connected to the tub (3), and a piston (5) whose one end is connected to the base, linearly moving in the cylinder (4).

Description

    A WASHER-DRYER COMPRISING DRY FRICTION DAMPER
  • The present invention relates to a washer-dryer comprising dampers damping the vibrational motions of the tub.
  • In washer-dryers, the tub in which laundry is loaded into the drum rotating within, makes oscillation and vibration motions depending on the load and the number of revolutions during operation. The tub is generally connected from its bottom to the base by means of dampers, and the dampers serve in reducing the transmission of the vibrations of the tub by damping them, and also acts as an energy transmission path transmitting the vibrations to the body. The tub and the drive group make vibrational motions of maximum amplitude at the resonance frequency zone, when the washing machine shifts from the washing step to the spinning step. The dampers prevent the tub from colliding into the body by damping vibrations of high amplitudes. Upon reaching the spinning revolutions, the vibration amplitude decreases and the damper whose friction forces are adjusted according to vibrations of high amplitudes, transmit the vibrations of lower amplitudes to the body generally without damping when a single-acting damper is being used. Single-acting dry friction dampers exhibit the same effect in all vibration amplitudes, i.e. all displacements of the damper cylinder with respect to the piston. Almost all of the kinetic energy of the actuation group and the tub is transmitted to the body, generating noises upsetting the user, particularly when shifting from the washing revolutions to the spinning revolutions, and from the spinning revolutions to the washing revolutions, i.e. in the resonance zone. Using dampers damping a higher amount of energy is needed due to increasing user demands for damping vibrations of both higher and lower amplitudes, and to wash laundry with a higher capacity. Double-acting, electronic or hydraulic dampers are used to meet such demand, but they have higher costs.
  • Patent applications no. US2006010935 (A1) and US2005188472 (A1) relate to a damper utilizing magnetic forces and a washing machine having said damper.
  • The aim of the present invention is to realize a washer-dryer comprising dampers damping vibrational motions of higher and lower amplitudes of the tub and utilizing magnetic forces.
  • In the washer-dryer realized to achieve the aim of the present invention, the damper used to damp the vibrational motion of the tub, comprises a coil wrapped on the outer surface of the cylinder, applying magnetic field to the inner region of the cylinder upon being supplied with electric current by means of a power source, and a core acting as an electromagnet by being polarized in the radial direction by the action of the applied magnetic field.
  • The damper is of the dry friction type, and comprises a friction member fixed to the inner surface of the cylinder and contacting all around the piston, and permanent magnets placed all around the friction member, polarized in the radial direction, placed to the inner side of the core so that their identical poles face each other, and enabling the friction member to throttle the piston by pushing the friction member in radial direction according to the current passed through the coil and the magnitude of the magnetic field applied by the core.
  • The washer-dryer further comprises a control unit detecting the vibration amplitude of the tub during operation, and enabling applying current to the coil by means of the power source and applying pressure to the piston by the magnets pushing the friction member in radial direction from outside to inside, upon the vibration amplitude exceeding a predetermined top critical value.
  • During operation of the washer-dryer of the invention, the damping effect of the damper is increased in the periods of shifting from the washing revolutions to the spinning revolutions, or from the spinning revolutions to the washing revolutions. During steady state spinning revolutions, the oscillation amplitudes of the tub decrease and the damping effect of the damper is reduced. In the damper of the invention, the damping affect can be modified by the current applied to the coil by the power source, and different damping effects are applied in accordance with each different oscillation amplitude. Unlike the known vibration dampers being applied magnetic forces in axial direction in order to increase or decrease the damping force, the magnets apply pressure to the friction member in radial direction, the friction member throttles the piston all around by narrowing when the damping effect is increased, and a compact damper structure is thus obtained.
  • The washer-dryer realized to achieve the aims of the present invention is illustrated in the accompanying drawings, wherein:
  • Figure 1 is a schematic view of a washer-dryer.
  • Figure 2 is a frontal view of a dry friction damper.
  • Figure 3 is a view of the A-A section of figure 2.
  • Figure 4 is a view of the detail C of figure 3.
  • Figure 5 is a view of the B-B section of figure 2.
  • The elements in the figures are numbered individually and the correspondence of these numbers are given hereinafter.
    1. Washer-dryer
    2. Drum
    3. Tub
    4. Cylinder
    5. Piston
    6. Damper
    7. Power source
    8. Coil
    9. Core
    10. Friction member
    11. Magnet
    12. Plastic shield
    13. Control unit
  • N-S: Magnet poles
  • The washer-dryer (1) comprises a drum (2) in which laundry is placed, a tub (3) making vibration (or oscillation) motion during operation by the action of the drum (2) rotating within, and a damper (6) damping the vibrational motion of the tub (3), having a cylinder (4) whose one end is connected to the tub (3), and a piston (5) whose one end is connected to the base, linearly moving in the cylinder (4).
  • The damper (6) of the invention comprises,
  • - a coil (8) made of electrically conductive wire wrapped on the outer surface of the cylinder (4), and applying a magnetic field to the inner region of the cylinder (4) when supplied with electric current by a power source (7),
  • - at least one ferromagnetic core (9) acquiring electromagnet property by being polarized in radial direction (N-S and S-N) by the magnetic field applied by the coil (8),
  • - a friction member (10) having a ring shape, for example a mating ring preferably made of elastomer material fixed to the inner surface of the cylinder (4), contacting all around the piston (5), and
  • - at least one magnet (11) of permanent type placed all around the friction member (10) nested and co-axially with the coil (8) and the core (9), the magnet being polarized in radial direction (N-S and S-N) and its identical poles with the core (9) facing each other, enabling applying pressure to the piston (5) by pushing the friction member (10) in radial direction all around from outside to inside according to the current passed from the coil (8) and the magnitude of the magnetic field applied by the core (9), and enabling modification of the friction force between the friction member (10) and the piston (5) and thus the damping effect of the damper (6).
  • In an embodiment of the invention, the damper (6) comprises a plurality of bar-shaped cores (9) arranged in the circumference of the cylinder (4) equally spaced all around the inner side of the coil (8), and a plurality of bar-shaped magnets (11) arranged in the circumference of the friction member (10) equally spaced and mutually with the cores (9).
  • In another embodiment of the invention, the damper (6) comprises a ring shaped core (9) surrounding the cylinder (4) body at the inner side on the coil (8), and a ring shaped magnet (11) surrounding the friction member (10) nested and co-axially with the core (9). The damper (6) further comprises a plastic shield (12) fitted around the coil (8) wrapped on the outer surface of the cylinder (4).
  • In an embodiment of the invention, the washer-dryer (1) comprises a control unit (13) measuring the vibration amplitude of the tub (3) by means of displacement sensors or by another method, and enabling applying current to the coil (8) by means of the power source (7) and applying pressure to the piston (5) by the magnets (11) pushing the friction member (10) in radial direction from outside to inside, and increasing the friction force between the friction member (10) and the piston (5) and thus the damping effect of the damper (6), upon the vibration amplitude exceeding a predetermined top critical value.
  • The control unit (13) enables cutting the current applied from the power source (7) to the coil (8), and the friction member (10) applying no pressure to the piston (5) by deactivating the core (9) and thus magnet (11), upon the vibration amplitude of the tub (3) being lower than a predetermined base critical value.
  • The control unit (13) enables the power source (7) to apply the coil (8) currents of different values corresponding to different vibration amplitudes, the friction member (10) to apply pressure to the piston (5) according to each detected vibration amplitude, and increasing or decreasing the damping effect upon detecting vibration amplitudes between the predetermined base critical value and the top critical value.
  • In the washer-dryer (1), the damping effect of the damper (6) is increased when the tub (3) oscillates with resonance frequency, particularly during shifting of the drum (2) from the washing revolutions to the spinning revolutions. When the oscillation amplitudes of the tub (3) decrease during steady state spinning revolutions of the drum (2), the damping effect of the damper (6) is reduced. In the damper (6) of the invention, the damping affect can be modified by the current applied to the coil (8) by the power source (7), and different damping effects are applied in accordance with each different oscillation amplitude. When consecutive oscillation amplitudes of varying values are detected, the damping effect can be modified so as to increase or decrease constantly instead of in steps, providing “smooth transitions” of the washer-dryer (1) from the washing revolutions to the spinning revolutions, or from the spinning revolutions to the washing revolutions. In addition, unlike the state of the art vibration dampers being applied magnetic forces in “axial” direction in order to increase or decrease the damping force, the magnets (11) apply pressure to the friction member (10) in ‘’radial’’ direction from outside to inside, the friction member (10) throttles the piston (5) all around by “narrowing” when the damping effect is increased, and a compact damper (6) structure is thus obtained occupying less space.

Claims (7)

  1. A washer-dryer (1) comprising a drum (2) in which laundry is placed, a tub (3) making vibrational motion during operation by the action of the drum (2) rotating within, and a damper (6) damping the vibrational motion of the tub (3), having a cylinder (4) and a piston (5) linearly moving in the cylinder (4), characterized by the damper (6) comprising
    - a coil (8) wrapped on the outer surface of the cylinder (4), and applying a magnetic field to the inner region of the cylinder (4) when supplied with electric current by a power source (7),
    - at least one ferromagnetic core (9) polarized in radial direction by the magnetic field applied by the coil (8),
    - a friction member (10) fixed to the inner surface of the cylinder (4), having a ring shape contacting all around the piston (5), and
    - at least one magnet (11) placed all around the friction member (10) nested and co-axially with the coil (8) and the core (9), the magnet being polarized in radial direction and its identical poles with the core (9) facing each other, enabling applying pressure to the piston (5) by pushing the friction member (10) in radial direction from outside to inside, according to the current passed from the coil (8) and the magnitude of the magnetic field applied and by the core (9).
  2. A washer-dryer (1) according to claim 1, characterized by the damper (6) comprising a plurality of bar-shaped cores (9) arranged in the circumference of the cylinder (4), equally spaced all around the inner side of the coil (8), each of the cores being polarized in radial direction by the coil (8), and a plurality of bar-shaped magnets (11) arranged in the circumference of the friction member (10) equally spaced and mutually with the cores (9).
  3. A washer-dryer (1) according to claim 1, characterized by the damper (6) comprising a ring shaped core (9) surrounding the cylinder (4) body at the inner side on the coil (8), and a ring shaped magnet (11) surrounding the friction member (10) nested and co-axially with the core (9).
  4. A washer-dryer (1) according to any one of claims 1 to 3, characterized by the damper (6) comprising a plastic shield (12) fitted around the coil (8) wrapped on the outer surface of the cylinder (4).
  5. A washer-dryer (1) according to any one of claims 1 to 3, characterized by a control unit (13) measuring the vibration amplitude of the tub (3), and enabling applying current to the coil (8) by means of the power source (7) and applying pressure to the piston (5) by the magnets (11) pushing the friction member (10) in radial direction from outside to inside upon the vibration amplitude exceeding a predetermined top critical value.
  6. A washer-dryer (1) according to claim 5, characterized by the control unit (13) enabling cutting the current applied from the power source (7) to the coil (8), and the friction member (10) applying no pressure to the piston (5), upon the vibration amplitude of the tub (3) being lower than a predetermined base critical value.
  7. A washer-dryer (1) according to claims 5 or 6, characterized by the control unit (13) enabling the power source (7) to apply to the coil (8) currents of different values corresponding to different vibration amplitudes, upon detecting vibration amplitudes between the base critical value and the top critical value.
EP17821476.3A 2016-12-27 2017-11-24 A washer-dryer comprising dry friction damper Withdrawn EP3562983A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2016/19654A TR201619654A2 (en) 2016-12-27 2016-12-27 WASHING DRYER WITH DRY FRICTION SHOCK ABSORBER
PCT/EP2017/080288 WO2018121940A1 (en) 2016-12-27 2017-11-24 A washer-dryer comprising dry friction damper

Publications (1)

Publication Number Publication Date
EP3562983A1 true EP3562983A1 (en) 2019-11-06

Family

ID=60812014

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17821476.3A Withdrawn EP3562983A1 (en) 2016-12-27 2017-11-24 A washer-dryer comprising dry friction damper

Country Status (3)

Country Link
EP (1) EP3562983A1 (en)
TR (1) TR201619654A2 (en)
WO (1) WO2018121940A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3874082B1 (en) * 2018-11-02 2023-11-08 Arçelik Anonim Sirketi A washer/dryer comprising a shock absorber

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6378671B1 (en) * 2000-03-29 2002-04-30 Lord Corporation Magnetically actuated motion control device
US20040231374A1 (en) * 2003-05-20 2004-11-25 Chang Jae Won Damper for washing machine
KR100548309B1 (en) * 2004-07-13 2006-02-02 엘지전자 주식회사 Damper using magnetic force and washing machine having the same

Also Published As

Publication number Publication date
TR201619654A2 (en) 2018-07-23
WO2018121940A1 (en) 2018-07-05

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