EP0740716B1 - Amelioration apportee a l'agencement d'equilibrage dynamique d'un lave-linge - Google Patents

Amelioration apportee a l'agencement d'equilibrage dynamique d'un lave-linge Download PDF

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Publication number
EP0740716B1
EP0740716B1 EP95905617A EP95905617A EP0740716B1 EP 0740716 B1 EP0740716 B1 EP 0740716B1 EP 95905617 A EP95905617 A EP 95905617A EP 95905617 A EP95905617 A EP 95905617A EP 0740716 B1 EP0740716 B1 EP 0740716B1
Authority
EP
European Patent Office
Prior art keywords
hollow bodies
drum
washing machine
machine according
annular
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
EP95905617A
Other languages
German (de)
English (en)
Other versions
EP0740716A1 (fr
Inventor
Silvano Cimetta
Ingo Haberl
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 Zanussi SpA
Original Assignee
Electrolux Zanussi Elettrodomestici SpA
Electrolux Zanussi SpA
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Filing date
Publication date
Application filed by Electrolux Zanussi Elettrodomestici SpA, Electrolux Zanussi SpA filed Critical Electrolux Zanussi Elettrodomestici SpA
Publication of EP0740716A1 publication Critical patent/EP0740716A1/fr
Application granted granted Critical
Publication of EP0740716B1 publication Critical patent/EP0740716B1/fr
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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

Definitions

  • the present invention refers to clothes washing machine, in particular of the household type, provided with an improved arrangement for dynamically balancing its rotating drum.
  • washing machine of the front-loading type refers specially to a washing machine of the front-loading type, and for greater convenience of exemplification the following description is actually referred to such a type of washing machine, it can in an advantageous manner be applied also to other types of washing machines, in particular to the ones that are loaded from the top or even to the machines that have their drum rotating about a vertical axis.
  • said lobes are arranged so as to be regularly distributed along a single circumference that has its center coinciding with the center of gravity of the respective hollow body, even if the perimeter of said hollow body does not of course coincide with said circumference, and that said center of gravity of the hollow body is situated on the axis of rotation and symmetry of the drum.
  • Figure 1 illustrates a preferred embodiment of such a hollow body, which is provided with three lobes arranged at regular intervals along the perimeter.
  • the perimeter of the hollow body is formed by three curvilinear sections 3, which are represented in the Figure as three arcs of three respective circumferences having a radius R which is greater than the radius r of the circumference 2.
  • the distance (r-f) between the point 4 and the point 5 represents the difference in height which a movable weight being positioned on a lobe should overcome to reach said point 5 by opposing the centrifugal force generated by the rotation of the drum.
  • the balancing weight In order to reach intermediate points 6 situated along said perimeter, the balancing weight has to overcome a smaller, but in any case positive difference in height (r-f').
  • Figure 3 it shows a perimeter of a hollow body according to the present invention, wherein said three lobes 1 are joined by the three arcs of a circle A, B and C, which are centered at the points 0A, 0B and 0C, respectively.
  • said three arcs may now be assumed to be identical, so that also their respective radii and angles of curvature will be the same. If the radii a and a' are now drawn between the center 0A and both ends of the corresponding arc A, and if the same thing is done as far as the radii b and b', as well as the radii c and c' are concerned, it can be noticed that said six radii will intersect each other, while the intersection points, along with the afore cited centers 0A, 0B and 0C, will define the vertices of a hexagon H which is shown with dotted lines in the Figure.
  • Each inner point in said hexagon is more distant from a generic point P situated within any of said three arcs A, B and C than the radii of equal length a, a', b, b', c and c', for any position of said generic point P except for the extreme points of the three lobes 1.
  • a first improvement which is rather an optimization, relates to the possibility of providing hollow bodies provided with a more or less large number of lobes, wherein the sections between contiguous lobes are more or less curved or straight.
  • This allows for a wide range of options that may be appropriately selected in view of optimizing, on the one hand, the minimum rotational speed at which the movable balancing weight are supposed to intervene and, on the other hand, their actual capacity of balancing the unbalanced drum ( Figures 2a, 2b).
  • a second improvement consists in the possibility of introducing a considerable plurality of movable balancing weights, such as for instance metal balls, in said hollow body. This is effective in increasing the balancing mass, and hence the balancing capacity even in front of markedly unbalanced loads, accordingly.
  • this has also the drawback that, in such a case, said balls tend, under the action of the centrifugal force, to form a single row of nonoverlapping balls.
  • a further improvement that is achieved thanks to said provision of a plurality of hollow bodies lies in the possibility of arranging said hollow bodies in contact with the side walls, ie. the front and/or back walls of the drum ( Figure 7), instead of having them arranged on the cylindrical surface thereof, where they would bring about the drawback of occupying a large portion of the space that is usually reserved to the inlet/outlet perforations provided for the passage of the wash liquor.
  • Figure 7 illustrates an embodiment provided with only two hollow bodies, but it will be appreciated that such an architecture may obviously be extended to include a greater number of hollow bodies arranged on the same side wall of the drum. Such an improvement extends to include both the case in which the hollow bodies have their lobes arranged on common radii, as this is shown in Figure 7, and the case in which said hollow bodies have their lobes arranged on different radii, as this is shown in Figure 7a.
  • lobed hollow bodies similarly apply also to the case in which one or more lobed hollow bodies are replaced, for each one of said hollow bodies, with a corresponding plurality of circular hollow bodies which may be either coplanar, and therefore provided with a different radius and fitted within each other, or arranged laterally in a side-by-side disposition, with their respective centers D1, D2, D3 in an off-center alignment with respect to the axis of the drum.
  • said combination of hollow bodies is manufactured as a single piece and, therefore, forms a cylinder, as it is shown by way of example in Figure 11, where also the cylindrical outer surface T of said piece comprising said hollow bodies is shown along with the projection on the exposed base of said cylinder of the three thichnesses d that delimitate said hollow bodies from each other.
  • a further advantageous improvement of the present invention consists also in the use of movable balancing weights that have the shape of a thick disk and are capable of being rotated inside said hollow bodies having a cross-section that is substantially similar to the cross-section of said disk D ( Figure 8). It is in fact widely appreciated that, as can be easily demonstrated, for an equal total volume occupied by the portion of hollow body filled with movable balancing weights, the weight of said movable balancing weights is greater if the latter are actually given such a disk-like shape than if they are given a ball-like shape, the most appropriate shapes and sizes being used in both cases in connection with the cross-section of the respective hollow bodies.
  • a further improvement consists in the use of movable balancing weights which, instead of being constituted by a plurality of separate, distinct solids, are formed by a thick fluid mass, preferably a liquid which has the purpose of sustaining the movement of and in which there are borne a high quantity of very small, high specific-gravity particles, such as sand, metal chips or powder, etc.
  • Such a combination would have the advantage of simplifying the construction of the movable balancing weights, while further improving the balancing capability, not only for the fact that a balancing mass provided in this way would not suffer from the discontinuities of distinct movable weights, but also for the fact that, under certain conditions, the ratio of the produced mass to the occupied volume may turn out to be still better than the one achievable in the afore illustrated case of the movable balancing weights being shaped as thick disks.

Landscapes

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

Claims (10)

  1. Lave-linge, en particulier du type ménager, comprenant un boítier externe, un bac de lavage, un tambour perforé de forme cylindrique contenue dans ledit bac et capable de tourner dedans autour de l'axe du cylindre pendant le lavage et l'essorage centrifuge, ledit tambour étant fourni avec un dispositif d'équilibrage dynamique composé d'une pluralité de corps creux étanches annulaires (P) faisant corps avec ledit tambour cylindrique, et une pluralité de masses d'équilibrage mobiles (P) qui sont capables de glisser librement dans lesdits corps creux, caractérisé en ce que:
    1) chaque corps creux (P) devra avoir un contour périphérique étanche qui est convexe le long de toute son extension, d'une façon telle que le segment joignant tout couple de points situé sur le périmètre du corps creux est entièrement contenu dans la surface délimitée par un tel périmètre;
    2) chaque corps creux devra représenter une pluralité de "lobes" (1), à savoir des portions de périmètre étant régulièrement distribuées le long dudit périmètre et situées à l'extérieur du cercle inscrit dans ledit périmètre.
  2. Lave-linge selon la revendication 1, caractérisé en ce que lesdits corps creux annulaires (P) sont disposés sur un plan et ce même plan et sont centrés coaxialement avec l'axe (O) du tambour, les profils annulaires respectifs dasdits corps creux annulaires ayant les dimensions les plus grandes et les plus petites telles qu'elles n'interfèrent pas ensemble.
  3. Lave-linge selon la revendication 1, caractérisé en ce que lesdits corps creux annulaires sont disposés de sorte qu'au moins deux d'entre eux sont situés côte à côte.
  4. Lave-linge selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdits corps creux tournent en relation les uns avec les autres, par rapport à l'axe du tambour, par un angle de 360°/(m.n), dans lequel m est le nombre de corps creux et n est le nombre de lobes de chaque corps creux.
  5. Lave-linge, en particulier du type ménager, comprenant un boítier externe, un bac de lavage, un tambour perforé de forme cylindrique contenu dans ledit bac et capable de tourner à l'intérieur autour de l'axe du cylindre pendant le lavage et l'essorage centrifuge, ledit tambour étant fourni avec un dispositif d'équilibrage dynamique composé d'une pluralité de corps creux étanches annulaires (P) faisant corps avec ledit tambour cylindrique, et une pluralité de masses d'équilibrage mobiles (P) qui sont capables de glisser librement dans lesdits corps creux, caractérisé en ce que:
    au moins un desdits corps creux annulaires se compose d'au moins une pluralité "S" de corps creux circulairas (11, 12, 13), chacun ayant son centre respectif (D1, D2, D3) tournant en relation avec le centre de chaque autre desdits corps creux, par rapport à l'axe du tambour, d'un angle de 360°/S;
    et lesdits corps creux (11, 12, 13) sont disposés d'une façon telle que leurs centres respectifs (C1, C2, C3) sont légèrement décentrés par rapport à l'axe du tambour.
  6. Lave-linge selon la revendication 5, caractérisé en ce que lesdits corps creux annulaires circulaires axialement décentrés les uns par rapport aux autres (11, 12, 13) ont des rayons différents (S1, S2, S3) et sont ajustés les uns dans les autres de façon coplanaire.
  7. Lave-linge selon la revendication 6, caractérisé en ce que lesdits corps creux annulaires circulaires axialement décentrés les uns par rapport aux autres ont la même épaisseur (H) et sont formés d'une seule pièce.
  8. Lave-linge selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdites masses d'équilibrage mobiles sont sous la forme d'un disque épais (D), la coupe transversale desdits corps creux étant rectangulaire et de dimensions telles que lesdites masses d'équilibrage mobiles sous la forme de disques épais peuvent y glisser en rotation.
  9. Lave-linge selon l'une quelconque des revendications 1 à 7, caractérisé en ce que la coupe desdits corps creux est rectangulaire et légèrement effilée vers le bord externe, un dégagement étant prévu entre la paroi interne desdits corps creux et les surfaces latérales desdites masses d'équilibrage mobiles.
  10. Lave-linge selon l'une quelconque des revendications 1 à 7, caractérisé en ce que lesdites masses d'équilibrage mobiles se composent de substances fluides denses.
EP95905617A 1994-01-28 1995-01-10 Amelioration apportee a l'agencement d'equilibrage dynamique d'un lave-linge Expired - Lifetime EP0740716B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT94PN000005A ITPN940005A1 (it) 1994-01-28 1994-01-28 Lavabiancheria con dispositivo perfezionato di bilanciamento dinamico
ITPN940005 1994-01-28
PCT/EP1995/000068 WO1995020702A1 (fr) 1994-01-28 1995-01-10 Amelioration apportee a l'agencement d'equilibrage dynamique d'un lave-linge

Publications (2)

Publication Number Publication Date
EP0740716A1 EP0740716A1 (fr) 1996-11-06
EP0740716B1 true EP0740716B1 (fr) 1998-07-08

Family

ID=11394858

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95905617A Expired - Lifetime EP0740716B1 (fr) 1994-01-28 1995-01-10 Amelioration apportee a l'agencement d'equilibrage dynamique d'un lave-linge

Country Status (7)

Country Link
EP (1) EP0740716B1 (fr)
JP (1) JPH09508044A (fr)
CA (1) CA2173471A1 (fr)
DE (1) DE69503356T2 (fr)
ES (1) ES2121341T3 (fr)
IT (1) ITPN940005A1 (fr)
WO (1) WO1995020702A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT238832Y1 (it) * 1995-02-01 2000-11-15 Zanussi Elettrodomestici Lavabiancheria con cesto antisbilanciamento perfezionato
IT1282930B1 (it) * 1995-10-13 1998-04-01 Electrolux Zanussi Elettrodome Lavabiancheria con dispositivo perfezionato di bilanciamento dinamico
KR101330732B1 (ko) 2009-10-23 2013-11-20 삼성전자주식회사 세탁기와 그 밸런서
ITUA20164457A1 (it) * 2016-06-16 2017-12-16 Antonio Francesco Chiriatti Bilanciatore per compensare sbilanciamento in cestello elettrodomestico

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1213067A (fr) * 1957-11-08 1960-03-29 Frame Machine à laver
US4044626A (en) * 1975-04-18 1977-08-30 Sanyo Electric Co., Ltd. Balancing ring of centrifugal extractor
GB1598399A (en) * 1977-06-02 1981-09-16 Hitachi Ltd Drum type automatic electric washing machine

Also Published As

Publication number Publication date
ITPN940005A0 (it) 1994-01-28
DE69503356T2 (de) 1998-11-19
ES2121341T3 (es) 1998-11-16
ITPN940005A1 (it) 1995-07-28
JPH09508044A (ja) 1997-08-19
WO1995020702A1 (fr) 1995-08-03
EP0740716A1 (fr) 1996-11-06
CA2173471A1 (fr) 1995-08-03
DE69503356D1 (de) 1998-08-13

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