EP2730691A1 - Horizontalachsenwaschmaschine mit Unwuchtsausgleichsmitteln - Google Patents

Horizontalachsenwaschmaschine mit Unwuchtsausgleichsmitteln Download PDF

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Publication number
EP2730691A1
EP2730691A1 EP20120192170 EP12192170A EP2730691A1 EP 2730691 A1 EP2730691 A1 EP 2730691A1 EP 20120192170 EP20120192170 EP 20120192170 EP 12192170 A EP12192170 A EP 12192170A EP 2730691 A1 EP2730691 A1 EP 2730691A1
Authority
EP
European Patent Office
Prior art keywords
drum
washing machine
wrapper
machine according
laundry washing
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
EP20120192170
Other languages
English (en)
French (fr)
Other versions
EP2730691B1 (de
Inventor
Antonio Chiriatti
Gerd Maentele
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
Priority to PL12192170T priority Critical patent/PL2730691T3/pl
Priority to EP12192170.4A priority patent/EP2730691B1/de
Publication of EP2730691A1 publication Critical patent/EP2730691A1/de
Application granted granted Critical
Publication of EP2730691B1 publication Critical patent/EP2730691B1/de
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
    • 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
    • D06F37/22—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations in machines with a receptacle rotating or oscillating about a horizontal axis
    • D06F37/225—Damping vibrations by displacing, supplying or ejecting a material, e.g. liquid, into or from counterbalancing pockets
    • 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
    • D06F37/26—Casings; Tubs
    • D06F37/265—Counterweights mounted to the tub; Mountings therefor

Definitions

  • the present invention relates to a laundry washing machine comprising a rotatable drum having a generally horizontal axis of rotation, a tub coaxially aligned with said axis of rotation and surrounding said drum, and balancing means adapted to reduce the effects of unbalanced laundry load during spinning.
  • the usual means includes counterweights mounted on the tub in order to increase its overall mass therefore reducing its movements due to unbalance. This is a general measure adopted by the majority of washing machines, but of course the total mass of counterweight cannot overcome certain threshold and moreover, even if vibrations are reduced, mechanical stresses on bearings are not.
  • Other means includes specific control software capable of detecting unbalances condition of the load before going into full spinning speed. Even if such software means are effective in preventing the effects of unbalance, sometime they prevent the drum from rotating at an acceptable spinning speed, with the consequence that the laundry load is very wet at the end of the washing cycle.
  • a third group of means includes the use of balance rings attached at least to one end of the drum and containing a balancing material that is movable circumferentially around each balance ring through its interior cavity.
  • balancing material can be a plurality of metal balls, a liquid having high density or water.
  • US 6158257 discloses a horizontal axis clothes washing machines in which the drum is provided with two balance rings attached to the drum proximate corresponding spaced-apart ends of the drum, each ring having an axis coaxially with the axis of rotation of the drum.
  • wash water can enter and acts as the balancing material, with such washing/rinsing water being basically present in the balance rings only during the spinning phase of the washing cycle.
  • the two rings reduce the useful space of the drum, since they are placed on the outside surface of the drum.
  • Another drawbacks lies in the need of producing the drum flared radially outward toward the ends proximate the balance rings, in order to assure the proper flow of balancing wash water towards the ring.
  • an oscillating washing system 10 is mounted in a cabinet of a washing machine (not shown) with the interposition of suspension means of known type.
  • the system comprises a plastic tub 12 in which it is rotatably mounted a metal drum 14 having a front opening 16 for loading the laundry.
  • the plastic tub 12 has known fixing portion 12a for installing counterweights (not shown).
  • the wrapper 18 is provided with L-shaped bent edges 18a whose functions will be clear in the following description.
  • the wrapper is also provided with shaped apertures 20 ( figures 1 , 3 and 6 ).
  • Each aperture 20 has a rectangular shape and is somehow funnel-shaped so that one edge 20a (parallel to the rotation axis of the drum) is inclined while a second edge 20b, opposite to the first edge 20a, is substantially orthogonal to the surface of the wrapper 18.
  • Other opposite edges 20c, slightly inclined, define with edges 20a and 20b each funnel-shape aperture 20.
  • the rotation of the drum is driven by an electric motor (not shown) interposed between the tub 12 and an axle of the drum 14 (so called "direct-drive" motor).
  • direct-drive motor
  • the invention may be used in washing machines having a drum rotated by a motor with the interposition of a belt and pulley.
  • wash water passes through holes in the drum and collects into the wrapper 18, dynamically distributing in a way as to compensate the unbalance of the load.
  • the bent edges 18a of the wrapper 18 prevent that water flows immediately in the tub 12.
  • the wrapper 18 may assume different configurations shown in figure 4 , depending on the kind of unbalance in the drum (unbalance at the front, at the rear or in the middle of the drum). Independently on the kind of unbalance, the amount of water involved in the balancing is much higher that the water used in the known balancing rings. This effect can be shown in figures 6 to 8 which refer to experimental test carried out by the applicant with a drum having capacity of 64 liters.
  • Figure 6 refers to an artificial unbalanced load (rubber piece of 0,5 kg placed in the middle of the drum) with water added at high speed (1000 rpm).
  • the test shows that when water is added into the drum (timing highlighted by reference W in the figures), there is reduction of horizontal and vertical accelerations from 2 g to 1 g. Similar results are obtained for higher spinning speed (1400 rpm of figure 8 , with reduction from 2 g to 1 g). Good results are obtained also for unbalance load on one end of the drum (front end).
  • Figure 7 shows for the same artificial load of figures 6 and 8 placed on the front, when water is added to the wrapper at 1000 rpm the horizontal and vertical accelerations are reduced from 1 g to 0,75 g and from 0,75 g to 0,6 g respectively.
  • the shaped apertures 20 allows a discharge of water if rotation of the drum at low speed is carried out in the direction of arrow F (clockwise direction referred to figure 3 ).
  • the spin direction (arrow E) is counterclockwise.
  • the shaped aperture 20 have preferably a height different from the centre of the wrapper 10 compared to its ends. This is shown in figure 6a (where apertures 20 are placed on a same line parallel to the axis of the wrapper for explanatory purposes only) in which shaped apertures 20 with smallest height are in the middle of the wrapper 18.
  • the wrapper 18 has ends 18a with a Z-shaped cross section, i.e. with a flat portion 22 at 90° with respect to the cylindrical wall of the wrapper, followed by a short stiffening cylindrical portion 24 having a diameter smaller that the diameter of the wrapper 18.
  • a flat portion 22 On the flat portion 22 there are a plurality of slots 26 which allow a predetermined overflow of the wash water if its depth is higher than depth D.
  • the overall length of the wrapper 18 may be substantially identical to the length of the drum 14, but tests carried out by the applicant have shown that good balancing effect can be obtained by using a wrapper shorter than the drum, for instance with a length comprised between one third and one half of the length of the drum. This "short" version of the wrapper 18 is shown in figure 6 .
  • the wrapper 18 is preferably made of metal sheet but it can be also made of polymeric material, for instance a reinforced thermosetting or thermoplastic resin. Moreover the drum 14 can have a plurality of bulges directed towards the outside of the drum which act as radial supports for the wrapper, the connection between the metal drum and the metal wrapper being made by welding or by gluing. In all cases the wrapper is substantially integral with the drum.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
EP12192170.4A 2012-11-12 2012-11-12 Horizontalachsenwaschmaschine mit Unwuchtsausgleichsmitteln Active EP2730691B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL12192170T PL2730691T3 (pl) 2012-11-12 2012-11-12 Pralka z poziomą osią obrotu wyposażona w środki wyważające
EP12192170.4A EP2730691B1 (de) 2012-11-12 2012-11-12 Horizontalachsenwaschmaschine mit Unwuchtsausgleichsmitteln

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12192170.4A EP2730691B1 (de) 2012-11-12 2012-11-12 Horizontalachsenwaschmaschine mit Unwuchtsausgleichsmitteln

Publications (2)

Publication Number Publication Date
EP2730691A1 true EP2730691A1 (de) 2014-05-14
EP2730691B1 EP2730691B1 (de) 2016-09-28

Family

ID=47172520

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12192170.4A Active EP2730691B1 (de) 2012-11-12 2012-11-12 Horizontalachsenwaschmaschine mit Unwuchtsausgleichsmitteln

Country Status (2)

Country Link
EP (1) EP2730691B1 (de)
PL (1) PL2730691T3 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016138924A1 (en) * 2015-03-02 2016-09-09 Arcelik Anonim Sirketi A laundry machine with an improved fluid distribution load balance system
CN110714302A (zh) * 2018-07-13 2020-01-21 无锡小天鹅电器有限公司 衣物处理设备及其平衡环

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2463801A (en) * 1944-07-11 1949-03-08 Herbert E Page Clothes-washing machine
CH439201A (de) * 1966-10-27 1967-07-15 Schulthess & Co Ag Maschf Vorrichtung zum Ausgleich der Unwucht einer mit Wäsche beladenen, horizontalaxigen Zentrifugiertrommel
WO2011025312A2 (en) * 2009-08-27 2011-03-03 Lg Electronics Inc. Control method of laundry machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2463801A (en) * 1944-07-11 1949-03-08 Herbert E Page Clothes-washing machine
CH439201A (de) * 1966-10-27 1967-07-15 Schulthess & Co Ag Maschf Vorrichtung zum Ausgleich der Unwucht einer mit Wäsche beladenen, horizontalaxigen Zentrifugiertrommel
WO2011025312A2 (en) * 2009-08-27 2011-03-03 Lg Electronics Inc. Control method of laundry machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016138924A1 (en) * 2015-03-02 2016-09-09 Arcelik Anonim Sirketi A laundry machine with an improved fluid distribution load balance system
CN110714302A (zh) * 2018-07-13 2020-01-21 无锡小天鹅电器有限公司 衣物处理设备及其平衡环
CN110714302B (zh) * 2018-07-13 2024-10-18 无锡小天鹅电器有限公司 衣物处理设备及其平衡环

Also Published As

Publication number Publication date
EP2730691B1 (de) 2016-09-28
PL2730691T3 (pl) 2017-08-31

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