EP2270273A1 - Waschmaschine - Google Patents

Waschmaschine Download PDF

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Publication number
EP2270273A1
EP2270273A1 EP20090008486 EP09008486A EP2270273A1 EP 2270273 A1 EP2270273 A1 EP 2270273A1 EP 20090008486 EP20090008486 EP 20090008486 EP 09008486 A EP09008486 A EP 09008486A EP 2270273 A1 EP2270273 A1 EP 2270273A1
Authority
EP
European Patent Office
Prior art keywords
drum
rear base
tub
washing machine
base
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
EP20090008486
Other languages
English (en)
French (fr)
Other versions
EP2270273B1 (de
Inventor
Mauro Cinello
Stefano Galassi
Marco Giovagnoni
Silvano Cimetta
Daniele Favaro
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 EP09008486.4A priority Critical patent/EP2270273B1/de
Publication of EP2270273A1 publication Critical patent/EP2270273A1/de
Application granted granted Critical
Publication of EP2270273B1 publication Critical patent/EP2270273B1/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
    • D06F37/02—Rotary receptacles, e.g. drums
    • D06F37/04—Rotary receptacles, e.g. drums adapted for rotation or oscillation about a horizontal or inclined axis
    • 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 refers to a laundry washing machine.
  • washing machines both “simple” washing machines (i.e. washing machines which can only wash and rinse the laundry) and washing-drying machines (i.e. washing machines which can also dry the laundry), usually comprise an external casing provided with a loading/unloading door which allows the access to a washing tub containing a rotary perforated drum in which the laundry to be washed can be loaded.
  • the tub is typically substantially cylindrical, and is provided with an opening for loading/unloading the laundry.
  • the opening for loading/unloading the laundry is provided on a frontal base of the tub, and the drum is associated to the tub by means of a rotating shaft which is supported by suitable bearings associated to a rear base of the tub.
  • the shaft typically protrudes out of the tub, so as to be connected, directly or by means of a suitable belt pulley, to an electric motor adapted to rotate the drum.
  • the washing tub of a front-loading washing machine is produced in a two-pieces construction, i.e. a front shell (comprising the frontal base and part of the lateral surface of the tub) and a rear shell (comprising the rear base and the rest of the lateral surface of the tub), by injection moulding of plastic material; the two shells are joined together by using known means, e.g. screws.
  • reinforcing ribs are integrally provided, so as to increase the strength of the structure; typically the ribs are arranged both circularly and radially in respect to the central portion of the rear wall.
  • a passing through hub (which may be metallic or plastic) is provided at the centre of the rear base for supporting the bearings of the rotating shaft; in many cases the hub is made with a core of cast iron, and is over injected by the plastic material.
  • the opening for loading/unloading the laundry is provided on a lateral surface of the tub, and the rotatable drum is supported by bearings usually distributed between the front base and the rear base of the tub.
  • EP 1 538 252 discloses a plastic tub for a clothes washing machine, in particular a washing machine of front-loading type, comprising a front shell and a rear shell, the rear shell being formed by a cylindrical envelope (or lateral surface) and a rear wall (or base) provided with reinforcing ribs.
  • a passing through hub is provided at the centre of the rear wall for supporting the bearing of a central shaft by means of which a clothes containing drum is driven into rotation within the tub; the hub is made by cast iron over injected by plastic material.
  • the rear circular wall of the rear shell is shaped with a plurality of ribbed circular sectors alternatively oriented in opposite axial direction, and at least one circular crown of radial ribs is provided around the hub.
  • the tub structure results with a reduced and constant thickness of the rear part of the tub, so as the injection moulding cycle for producing it is correspondingly reduced.
  • the convex and concave areas present at the rear wall of the tub generates turbulence also in the air movement during the spinning phase, which results in an increasing of the noise also during such a phase, and in an higher energy consumptions in the electric motor which rotates the drum.
  • washing liquid tends to collect in the concave areas present on the rear wall, and there is the risk that the rinsing water can't remove such liquid; these washing residues favour the proliferation of bacteria and/or scale, with the consequent production of bad odours.
  • the aim of the present invention is therefore to increase the mechanical resistance of the tub of a washing machine, assuring at the same time a low level of noise and a reduced risk of formation of washing residues.
  • Another object of the invention is to increase the volume internal to the drum of a washing machine without excessively increasing the external dimensions of the washing machine.
  • Another object of the invention is to reduce the weight of a wsahing machine without reducing the mechanical performances.
  • the Applicant has found that by making the internal surface of the rear base of the tub substantially smooth and substantially convex, it is possible to increase the mechanical resistance of the tub, assuring at the same time a low level of noise and a reduced risk of formation of washing residues.
  • a washing machine comprising a tub provided with a rear base and a lateral surface, the rear base comprising an internal surface substantially smooth and substantially convex.
  • number 1 indicates the washing tub 1 of a washing machine, not illustrated, according to the invention.
  • the washing tub 1 comprises a rear shell 2 (i.e. a box shaped body, opened at one end), provided with a rear base 3 (or wall or surface), substantially cylindrical, and with a lateral surface 4; advantageously the tub 1 also comprises a frontal shell 5 provided with a frontal base 6 (or wall or surface), substantially cylindrical, and with a lateral surface 7.
  • a rear shell 2 i.e. a box shaped body, opened at one end
  • the tub 1 also comprises a frontal shell 5 provided with a frontal base 6 (or wall or surface), substantially cylindrical, and with a lateral surface 7.
  • the rear shell 2 is substantially cylindrical, and it is preferably obtained in a single-piece construction by moulding of a plastic material; also the frontal shell 5 is opportunely substantially cylindrical, and it is preferably obtained in a single-piece construction by moulding of a plastic material.
  • the rear and/or the frontal shells are provided with liquid adduction/extraction means, adapted to allow the inlet and/or the outlet of washing/rinsing liquid (i.e. water or water mixed with washing products) in/from the tub 1;
  • these adduction/extraction means comprise, for example, one ore more pipe couplings, numbered 50 and 60 in the enclosed Figures, adapted to be connected to one or more pipes or ducts, not illustrated, fluidly connected to the washing/rinsing circuit of the washing machine, also not illustrated.
  • the rear shell 2 and the frontal shell 5 are joined together, in correspondence respectively of their lateral surfaces 4 and 7, by suitable joining means; advantageously the joining means comprise, for example, a first flange 4a, protruding radially from the free border of the lateral surface 4 of the rear shell 2, and a second flange 7a, protruding radially from the free border of the lateral surface 7 of the frontal shell 5, designed in order to fit one another.
  • the first and second flange can be advantageously fixed one another by suitable fixing means, comprising, for example, screws 8 or rivets, and/or gluing and/or welding, and/or snap-fitting.
  • a hub 9 is opportunely provided at/to the rear base 3, in which one or more bearings 10a, 10b are placed, preferably substantially cylindrical, adapted to bear a rotating shaft 11 associated to a rotatable drum 12 contained in the tub 1, which will be described in the following.
  • the hub 9 may be metallic (preferably it is made with a core of cast iron) and it may be over injected by the plastic material during the moulding of the rear shell 2.
  • the hub 9 is made of plastic.
  • the hub 9 is substantially cylindrical, it is placed substantially in correspondence of the central portion of the rear base 3, and it is provided, preferably at its ends, with one or more seats 9a, 9b, adapted to lodge respectively the one or more bearings 10a, 10b.
  • the rear base 3 comprises an internal surface 3a which is substantially smooth (i.e. it is substantially free from irregularities, roughness, or projections) and is substantially convex.
  • the internal surface 3a of the rear base 3 is curved.
  • the internal surface 3a of the rear base 3 is part of a substantially spherical surface, a portion of which is illustrated in Figure 6 and is numbered 13.
  • the shape of the internal surface 3a substantially coincides with a part of a substantially spherical surface 13.
  • the rear base 3 comprises reinforcing ribs 15, adapted to increase the strength of the structure, protruding from the rear base 3 towards the external of the tub 1, and preferably obtained in a single-piece construction with the rear base 3; the reinforcing ribs 15 are preferably arranged both circularly and radially with respect to the central portion of the rear base 3.
  • the washing machine is of the front-loading type, and therefore the frontal base 6 of the frontal shell 5 is provided with a first opening 16 adapted for allowing the loading/unloading of the laundry in/from the tub 1.
  • the present invention can be applied, with few modifications, also to a top-loading washing machine.
  • the washing machine comprises a drum 12, rotatably housed in the tub 1, substantially cylindrical and preferably metallic; advantageously the drum 1 comprises a rear base 17 (or wall or surface), and a frontal base 18 (or wall or surface), substantially circular, connected by a lateral surface or envelope 19.
  • the drum 12 is provided with a plurality of holes, not illustrated, obtained on the lateral surface or envelope 19 and/or on the rear and/or frontal bases 17, 18, in order to allow a washing liquid contained in the tub 1 to flow into and out of the drum 12.
  • the drum 12 comprises one or more lifters 20 (or elevators or diverter), adapted to improve the stirring of the laundry during the rotation of the drum 12;
  • the lifters 20 are substantially prismatic elements fixed to the internal face of the lateral surface or envelope 19 of the drum 12, and positioned with their longitudinal axis substantially parallel to the rotation axis 21 of the drum 12.
  • the washing machine is a front-loading washing machine, and therefore on the frontal base 18 of the drum 12 a second opening 22 is obtained, allowing the loading/unloading of the laundry in/from the drum 12.
  • the present invention can be applied, with few modifications, also to a top-loading washing machine.
  • the rear base 17 of the drum 12 comprises an external surface 17a, facing the rear base 3 of the tub 1; in the embodiment illustrated in the enclosed Figures, on the rear base 17 of the drum 12 a plurality of concave and convex regions are defined, having different curvatures, which increase the mechanical strength of the rear base 17.
  • the external surface 17a of the rear base 17 of the drum 12 is substantially concave; in particular, with reference to the enclosed figures, the external surface 17a comprises three concave regions 100 adapted to be associated to the branches 26 of a spider 24, which will be described in the following.
  • concave regions 100 are not necessarily three; in a further embodiment, not illustrated, they may be also two, four, five, or any suitable number.
  • At least part of the external surface 17a of the rear base 17 of the drum 12 is curved.
  • At least part of the external surface 17a is part of a substantially spherical surface, a portion of which is illustrated in Figure 6 and is numbered 23; with particular reference to the embodiment illustrated in the enclosed Figures, at least the concave regions 100 of the external surface 17a are curved and are part of a the spherical surface 23.
  • the substantially spherical surface 23 has substantially the same diameter of the substantially spherical surface 13 which defines at least part of the internal surface 3a of the rear base 3 of the rear shell 2.
  • At least part of the external surface 17a is substantially parallel to the internal surface 3a of the rear base 3 of the rear shell 2; with particular reference to the embodiment illustrated in the enclosed Figures, at least the three concave regions 100 of the external surface 17a are substantially parallel to the internal surface 3a.
  • the whole external surface 17a is smooth and concave (i.e. not provided with convex and concave regions, but fully concave); in this case the whole external surface 17a (and therefore not only a part of the external surface 17a) is advantageously curved and is part of a substantially spherical surface and is substantially parallel to the internal surface 3a of the rear base 3 of the rear shell 2.
  • he washing machine comprises a spider 24 (or supporting star) supporting the shaft 11 and fixed to the external surface 17a of the rear base 17 of the drum 12; the spider 24 is advantageously metallic.
  • the spider 24 comprises a central region 25, from which a plurality of branches 26 radially protrudes; the branches 26 are curved in such a way that they can be associated to the rear base 17 of the drum. 12.
  • branches 26 are placed respectively substantially in correspondence to the concave regions 100 of the external surface 17a of the rear base 17 of the drum 12.
  • the branches 26 may be preferably fixed to the rear base 17 of the drum 12, in correspondence of their free end 26a, by suitable fixing means, comprising for example suitable screws or rivets, not illustrated, and/or by gluing and/or welding.
  • the length of the branches 26 is such that the free ends 26a of the branches 26 is positioned substantially in correspondence to the external border of the rear base 17.
  • branches 26 of the spider 24 are provided with a rear surface 27, opposite to the drum 12 and facing the rear base 3 of the tub 1, at least part of which is substantially concave.
  • the rear surface 27 of the branches 26 is at least partially curved.
  • At least part of the rear surface 27 of the branches 26 is part of a substantially spherical surface, a portion of which is illustrated in Figure 6 and is numbered 28.
  • the substantially spherical surface 28 has substantially the same diameter of the substantially spherical surface 13 which defines at least part of the internal surface 3a of the rear base 3 of the rear shell 2.
  • At least part of the rear surface 27 of the branches 26 of the spider 24 is substantially parallel to the internal surface 3a of the rear base 3 of the rear shell 2.
  • the rear surface 27 of the branches 26 comprises a smooth curved region 27a, which is part of a substantially spherical surface 28, and a further hollow region defining a cavity 27b.
  • the whole rear surface 27 of the branches 26 is smooth and curved, and it is part of the substantially spherical surface 28.
  • the internal surface 3a f the rear base 3 of the rear shell 2, at least part of the rear surface 27 of the branches 26 of the spider 24, and at least part of the external surface 17a of the rear base 17 of the drum 12, are opportunely substantially parallel one another.
  • the internal surface 3a f the rear base 3 of the rear shell 2, at least part of the rear surface 27 of the branches 26 of the spider 24, and at least part of the external surface 17a of the rear base 17 of the drum 12, are opportunely part of three spherical surfaces which have substantially the same diameter.
  • the shaft 11 is fixed to the central region 25 of the spider 24, and protrudes perpendicularly to such a central region 25; preferably the shaft 11 is fixed to the spider 24 by burying one end of the shaft 11 inside the central region 25 during the moulding of the spider 24.
  • the spider 24, and therefore the drum 12 fixed to the latter is rotatably associated to the tub 1 by the insertion of the shaft 11 in one or more bearings 10a, 10b placed into suitable seats 9a, 9b provided in the hub 9.
  • At least one of the one or more bearings 10a, 10b (with reference to the enclosed Figures, the bearing numbered 10a) is advantageously positioned at least partially between the drum 12 and a plane 300 passing through the contact regions of the free ends 26a of the branches 26 of the spider 24 and the external surface 17a of the rear base 17 of the drum 12.
  • the particular positioning of the bearing 10a increases also the mechanical resistance of the structure.
  • the free end 11 a of the shaft 11 exits the tub 1 through the hub 9, so as to be fixed to rotating means adapted to rotate the drum 12 with respect to the tub 1.
  • the rotating means advantageously comprise a pulley 29, fixed to the free end 11a of the shaft 11, and connected, preferably by a belt, not illustrated, to a suitable electrical motor 30, associated, for example, to the tub 1.
  • an electric motor can be mounted directly on the shaft 11.
  • rear shells 2 with a fixed diameter to frontal shells 5 with the same fixed diameter but with different lengths, it is possible to obtain washing tubs 1 of different volumes and with the same fixed diameter (arid therefore with different lengths); for the same purpose it is alternatively possible to join frontal shells 5 with a fixed diameter to rear shells 2 with the same fixed diameter, but with different lengths.
  • the tub may be obtained, for example, by the joint of two shells, both of them being substantially equal to the rear shell 2 described with reference to the enclosed Figures.
  • An opening for loading/unloading the laundry could be provided on the lateral surface of the tub.
  • the drum could comprise, in this case, two bases substantially equal to the rear base 17 of the drum 12 described with reference to the enclosed Figures; each base is connected, preferably by a spider substantially equal to the one described with reference to the enclosed Figures, to a shaft rotatably associated respectively to one of the bases of the two shells of the tub.
  • An opening for loading/unloading the laundry could be in this case provided on the lateral surface of the drum.
  • washing machine which, thanks to the smoothness and to the particular shape (preferably substantially spherical) of the internal surface of the first base of the tub, assures a high mechanical resistance of the tub, coupled with a low level of noise and with a reduced risk of formation of washing residues which should favour the proliferation of bacteria and/or scale.
  • the particular shape (preferably substantially spherical) of the rear base of the rear shell, and the particular positioning of the bearings with respect to the rear base of the drum and to the spider allows reducing the resitance to blending stress which must be provided by the hub, and therefore allow using a hub with a lower diameter, reducing in this way the weight and the costs of the washing macine.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
EP09008486.4A 2009-06-29 2009-06-29 Waschmaschine Active EP2270273B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09008486.4A EP2270273B1 (de) 2009-06-29 2009-06-29 Waschmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09008486.4A EP2270273B1 (de) 2009-06-29 2009-06-29 Waschmaschine

Publications (2)

Publication Number Publication Date
EP2270273A1 true EP2270273A1 (de) 2011-01-05
EP2270273B1 EP2270273B1 (de) 2016-01-27

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ID=41153205

Family Applications (1)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106567222A (zh) * 2014-09-29 2017-04-19 青岛海尔滚筒洗衣机有限公司 一种滚筒洗衣机
EP3339491A4 (de) * 2015-08-19 2018-12-05 Teknia Bilbao XXI, Sociedad Limitada Trommelbaugruppe für eine waschmaschine
EP3421655A4 (de) * 2016-02-25 2019-10-23 TCL Home Appliances (Hefei) Co., Ltd. Innenzylinderanordnung für waschmaschine und trommelwaschmaschine
CN110761028A (zh) * 2019-10-10 2020-02-07 无锡小天鹅电器有限公司 衣物处理装置
CN110777502A (zh) * 2019-10-10 2020-02-11 无锡小天鹅电器有限公司 衣物处理装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0595040A1 (de) * 1992-10-29 1994-05-04 ELECTROLUX ZANUSSI ELETTRODOMESTICI S.p.A. Verfahren zur Herstellung einer Kunststofftrommel und so erhaltene Trommel
EP1538252A1 (de) 2003-12-01 2005-06-08 Electrolux Home Products Corporation N.V. Laugenbehälter aus Kunststoff für eine Wäschewaschmaschine
EP1619286A2 (de) * 2004-07-20 2006-01-25 Lg Electronics Inc. Trommelwaschmaschine und Lagergehäuse hierfür
JP2007061542A (ja) * 2005-09-02 2007-03-15 Matsushita Electric Ind Co Ltd ドラム式洗濯機
WO2008010674A2 (en) * 2006-07-20 2008-01-24 Lg Electronics Inc. Drum type laundry machine
WO2008102396A2 (en) * 2007-02-21 2008-08-28 Meccanica Generale S.R.L. Washing machine tank provided with external reinforcing cap on bottom wall
FR2921079A1 (fr) * 2007-09-13 2009-03-20 Lg Electronics Inc Machine a laver du type a tambour.
CN201236285Y (zh) * 2008-07-28 2009-05-13 南京乐金熊猫电器有限公司 滚筒洗衣机防漏水装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0595040A1 (de) * 1992-10-29 1994-05-04 ELECTROLUX ZANUSSI ELETTRODOMESTICI S.p.A. Verfahren zur Herstellung einer Kunststofftrommel und so erhaltene Trommel
EP1538252A1 (de) 2003-12-01 2005-06-08 Electrolux Home Products Corporation N.V. Laugenbehälter aus Kunststoff für eine Wäschewaschmaschine
EP1619286A2 (de) * 2004-07-20 2006-01-25 Lg Electronics Inc. Trommelwaschmaschine und Lagergehäuse hierfür
JP2007061542A (ja) * 2005-09-02 2007-03-15 Matsushita Electric Ind Co Ltd ドラム式洗濯機
WO2008010674A2 (en) * 2006-07-20 2008-01-24 Lg Electronics Inc. Drum type laundry machine
WO2008102396A2 (en) * 2007-02-21 2008-08-28 Meccanica Generale S.R.L. Washing machine tank provided with external reinforcing cap on bottom wall
FR2921079A1 (fr) * 2007-09-13 2009-03-20 Lg Electronics Inc Machine a laver du type a tambour.
CN201236285Y (zh) * 2008-07-28 2009-05-13 南京乐金熊猫电器有限公司 滚筒洗衣机防漏水装置

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106567222A (zh) * 2014-09-29 2017-04-19 青岛海尔滚筒洗衣机有限公司 一种滚筒洗衣机
EP3339491A4 (de) * 2015-08-19 2018-12-05 Teknia Bilbao XXI, Sociedad Limitada Trommelbaugruppe für eine waschmaschine
EP3421655A4 (de) * 2016-02-25 2019-10-23 TCL Home Appliances (Hefei) Co., Ltd. Innenzylinderanordnung für waschmaschine und trommelwaschmaschine
US10883217B2 (en) 2016-02-25 2021-01-05 Tcl Home Appliances (Hefei) Co., Ltd. Washing machine inner cylinder assembly and drum-type washing machine
CN110761028A (zh) * 2019-10-10 2020-02-07 无锡小天鹅电器有限公司 衣物处理装置
CN110777502A (zh) * 2019-10-10 2020-02-11 无锡小天鹅电器有限公司 衣物处理装置
CN110777502B (zh) * 2019-10-10 2022-09-23 无锡小天鹅电器有限公司 衣物处理装置

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