EP1899523A1 - Lave-linge a clapet anti-retour - Google Patents

Lave-linge a clapet anti-retour

Info

Publication number
EP1899523A1
EP1899523A1 EP06755915A EP06755915A EP1899523A1 EP 1899523 A1 EP1899523 A1 EP 1899523A1 EP 06755915 A EP06755915 A EP 06755915A EP 06755915 A EP06755915 A EP 06755915A EP 1899523 A1 EP1899523 A1 EP 1899523A1
Authority
EP
European Patent Office
Prior art keywords
drain
return valve
washing machine
closing element
rest
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Withdrawn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
EP06755915A
Other languages
German (de)
English (en)
Inventor
Giovanni Bombardieri
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 EMEA SpA
Original Assignee
Indesit Co SpA
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 Indesit Co SpA filed Critical Indesit Co SpA
Publication of EP1899523A1 publication Critical patent/EP1899523A1/fr
Withdrawn legal-status Critical Current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
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements
    • D06F39/086—Arrangements for avoiding detergent wastage in the discharge conduit
    • 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
    • D06F37/42—Safety arrangements, e.g. for stopping rotation of the receptacle upon opening of the casing door

Definitions

  • the present invention relates to a washing machine, in particular a household washing machine or washing/drying machine, according to the preamble of claim 1.
  • the items to be washed are placed into a tub of the machine; in laundry washing machines and washing/drying machines, the laundry is placed into a drum located inside the tub.
  • a wash liquid typically water or a water solution
  • prewash the most common wash phases
  • wash the most common wash phases
  • rinse the most common wash phases
  • a washing agent detergent, softener, rinse aid, Certainly is typically introduced into the tub.
  • the wash liquid is drained.
  • the tub is fitted with a drain aperture connected to a drain duct, which in turn is connected to a drain pipe usually belonging to the hydraulic system of a building; at least a stop valve for the drain duct, a drain pump and a non-return valve are typically installed along the drain duct of the washing machine, in this order.
  • the stop valve is located immediately downstream of the drain aperture of the tub, and prevents the washing agents from leaving the tub during the wash phases; typically, the drain aperture of the tub is located in a low area of the machine, and the drain duct extends from said low area of the machine up to a high area of the same, where the drain duct connects to the drain pipe, at a height typically comprised between 60 cm and 90 cm.
  • a stop valve placed immediately downstream of the drain aperture of the tub a valve of the float-type is commonly used (the float being typically a plastic ball).
  • the drain duct is shut by the float due to the effect of the hydrostatic force exerted by the liquid being present in the drain duct, which is at a lower level than the float.
  • the non-return valve blocks any action of the liquid being present in the drain duct downstream of the non-return valve; in particular, it blocks the pressure action exerted by the liquid being present in the drain duct at a higher level than the float.
  • the general object of the present invention is to obtain a very good sealing of the stop valve located downstream of the drain aperture of the tub, also in the presence of a non-return valve.
  • the present invention is based on the idea of using a passage which transmits the liquid pressure from downstream to upstream of the non-return valve even when the latter is closed, with just a minimal reflux of liquid. In this way, pressure can be exerted on the float even when the non-return valve is closed.
  • the present invention also relates to a nonreturn valve.
  • Fig. 1 shows a schematic sectional view of a washing machine according to the present invention
  • Fig. 2 shows very schematically a non-return valve according to the present invention as used in the washing machine of Fig. 1. S aid description and said drawings are to be considered as non-limiting examples.
  • Fig. 1 shows a washing machine according to the present invention, indicated as a whole with reference number 1; in particular, said washing machine comprises a special non-return valve, indicated with reference number 7 and illustrated in Fig. 2.
  • the washing machine 1 comprises a tub 2 housing a drum 3, which is used for containing the laundry items to be washed; in Fig. 1, reference number 31 designates the laundry contained in drum 3.
  • Drum 3 is rotated about its axis 30 by an electric motor (not shown in Fig. 1) under the control of an electronic control unit (not shown in Fig. 1).
  • Tub 2 is provided with a drain aperture 21 connected to a drain duct of the washing machine, indicated as a whole with reference number 4.
  • Drain duct 4 is connected on a first end to drain aperture 21 and on a second end (upper right in Fig. 1) to a drain pipe (not shown in Fig. 1); in the example of Fig.1, said second end has an elbow.
  • drain duct 4 the following components are installed, in this order: a stop valve 5, a drain filter 8, a drain pump 6, and a non-return valve 7; a first portion 41 of drain duct 4 connects the drain aperture 21 to the inlet of stop valve 5; a second portion 42 of drain duct 4 connects the outlet of stop valve 5 to the inlet of drain filter 8; a third portion 43 of drain duct 4 connects the outlet of drain filter 8 to the inlet of drain pump 6; a fourth portion 44 of drain duct 4 connects the outlet of drain pump 6 to the inlet of non-return valve 7; a fifth portion 45 of drain duct 4 connects the outlet of non-return valve 7 to the drain pipe.
  • Fig. 1 is a schematic view, and therefore the lengths of portions 41, 42, 43, 44, 45 of drain duct 4 are merely explanatory; typically, for instance, both portions 41 and 44 are very short or at most absent.
  • Stop valve 5 is of the well-known float type; in Fig. 1, it is schematized through a chamber 50 within which a float 51, typically a plastic ball, can move. In Fig. 1, valve 5 is shown in the closed state, in particular with its float 51 positioned high to shut the upper aperture of chamber 50. During the drain phase, float 51 is down next to the lower aperture of chamber 50; of course, the area around the lower aperture of chamber 50 is shaped in such a way as to allow the wash liquid to flow even when float 51 is down.
  • washing machine 1 is shown in an operating condition wherein there is wash liquid in tub 2 and in drain duct 4 nearly up to its upper elbow; in this operating condition, stop valve 5 and non-return valve 7 are both closed.
  • Fig. 2 shows schematically a particularly advantageous, but not restrictive, example of embodiment of the non-return valve according to the present invention.
  • Valve 7 comprises a body with a cavity 70 having an inlet aperture 74 and an outlet aperture 75; during the drain phase, the wash liquid flows from inlet aperture 74, through cavity 70, to outlet aperture 75 as indicated by the arrows in Fig. 2.
  • Cavity 70 houses a closing element consisting of a flexible tang 71, e.g. made of natural or synthetic rubber; tang 71 is fastened to an inner wall of cavity 70 so that, when at rest, tang 71 shuts inlet aperture 74 by resting on an annular element 72, and the valve is therefore closed.
  • valve 7 consists in the presence of a passage which connects inlet aperture 74 to outlet aperture 75 even when tang 71 is closed; in the example of Fig. 2, this passage is a hole 73 in a central area of tang 71.
  • non-return valve 7 is located immediately downstream of drain pump 6; thus, inlet aperture 74 of valve 7 corresponds to the outlet of pump 6.
  • the diameter of inlet aperture 74 is typically 1 cm to 2 cm; the diameter of outlet aperture 75 is typically 1 cm to 2 cm; the diameter of hole 73 may be 2 to 6 mm.
  • drain pump 6 During the drain phase, the wash liquid arriving at inlet aperture 74 under the action of drain pump 6 presses tang 71, thereby bending it; in this way, the liquid can flow without substantially encountering any obstacles inside cavity 70 and then, through outlet aperture 75 and portion 45 of drain duct 4, in the drain pipe.
  • drain pump 6 When tub 2 is completely empty, drain pump 6 will no longer deliver any liquid to valve 7, so that tang 71 returns to its rest position due to its elasticity and valve 7 closes; the liquid in drain duct 4 downstream of valve 7, i.e.
  • a washing machine comprises:
  • a tub for containing items to be washed provided with a drain aperture, - a drain duct connected on a first end to the drain aperture and adapted to be connected on a second end to a drain pipe; at least the following components are placed along the drain duct, in this order:
  • a drain duct stop valve said stop valve being of the float type, a drain pump, a non-return valve; a passage connects a first portion of the drain duct downstream of the nonreturn valve to a second portion of the drain duct upstream of the non-return valve.
  • Said passage may be obtained in many different ways and may have different lengths depending on how the present invention is implemented; said passage must be made in such a way as to transmit the pressure from downstream to upstream of the non-return valve under static conditions, as well as to greatly limit the flow of liquid from downstream to upstream of the non-return valve under dynamic conditions.
  • the non-return valve minimises the cavitation noise produced by the drain pump.
  • the passage minimises a perfect sealing of the stop valve is obtained also in the presence of a non-return valve, even when the latter is closed. Due to its simplicity and inexpensiveness, the present invention is therefore suited to being applied particularly advantageously to household washing machines or washing/drying machines; as a matter of fact, it is clear that the same problem could also be solved by using much more complex and costly solutions based, for example, on solenoid valves.
  • a simple way to obtain the desired technical effect consists in providing a passage having a small cross-section at least for a certain length.
  • the passage may be configured and arranged in such a way as to connect a first portion of the drain duct immediately downstream of the non-return valve to a second portion immediately upstream of the non-return valve; with this solution, for instance, the passage can be associated with or integrated into the non-return valve, and no additional components are required.
  • a simple and cheap but effective non-return valve particularly suited to the present invention comprises a closing element substantially consisting of a flexible tang, a revolving lid or a movable body within a cavity.
  • the passage may simply consist of at least one hole in the closing element, preferably located in a central area of the closing element, as in the example of Fig. 2.
  • the diameter of said hole In order to allow pressure to be transmitted while limiting the liquid flow, the diameter of said hole must be chosen within a range of approx. 2 mm to approx. 6 mm; with smaller diameters, the hole would tend to be clogged by dirt and/or detergent; larger diameters would not allow to obtain a sufficient restriction of the liquid flow.
  • At least one hole in a fixed element may be provided.
  • the non-return valve comprises an annular rest and the closing element rests on said rest in the event of a reflux
  • the passage may simply consist of at least one hole in the rest; the above considerations would apply to this hole as well.
  • the washing machine according to the present invention may also be provided with a drain filter along the drain duct.
  • a drain filter Preferably, such a filter should be located immediately upstream of the drain pump, as in the example of Fig. 1.
  • the non-return valve it may advantageously be located immediately downstream of the drain pump; this solution would minimize the quantity of liquid which may give rise to pump cavitation noise.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Abstract

L'invention concerne un lave-linge (1), plus précisément un lave-linge domestique ou un lave-linge/séchoir, comprenant une cuve (2) destinée à contenir des articles (31) à laver et dotée d'un orifice d'évacuation (21), et un conduit d'évacuation (4) relié par une première extrémité à l'orifice d'évacuation (21) de la cuve et par une seconde extrémité à un tuyau d'évacuation; au moins les composants suivants sont situés dans cet ordre le long du conduit d'évacuation (4): une vanne d'arrêt (5) du type flottant (51) qui ferme le conduit d'évacuation (4), une pompe d'évacuation (6), et un clapet anti-retour (7); un passage (73) relie une première partie (45) du conduit d'évacuation en aval du clapet anti-retour (7) à une seconde partie (44) du conduit d'évacuation en amont du clapet anti-retour (7).
EP06755915A 2005-05-30 2006-05-26 Lave-linge a clapet anti-retour Withdrawn EP1899523A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000365A ITTO20050365A1 (it) 2005-05-30 2005-05-30 Macchina di lavaggio con valvola antiriflusso
PCT/IB2006/001389 WO2006129159A1 (fr) 2005-05-30 2006-05-26 Lave-linge a clapet anti-retour

Publications (1)

Publication Number Publication Date
EP1899523A1 true EP1899523A1 (fr) 2008-03-19

Family

ID=36933344

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06755915A Withdrawn EP1899523A1 (fr) 2005-05-30 2006-05-26 Lave-linge a clapet anti-retour

Country Status (3)

Country Link
EP (1) EP1899523A1 (fr)
IT (1) ITTO20050365A1 (fr)
WO (1) WO2006129159A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITRN20070021A1 (it) * 2007-04-05 2008-10-06 Indesit Co Spa Macchina di lavaggio.
ATE505579T1 (de) * 2007-11-28 2011-04-15 Arcelik As Waschmaschine
ES2347114B1 (es) * 2008-12-12 2011-08-18 Bsh Electrodomesticos España, S.A. Maquina lavadora.
ES2378921B1 (es) * 2009-10-08 2013-03-19 Bsh Electrodomésticos España, S.A. Válvula de desagüe para orificio de desagüe de cuba de máquina lavadora y máquina lavadora con dicha válvula de desagüe.
EP3015587A1 (fr) * 2014-10-27 2016-05-04 Whirlpool Corporation Machine à laver
US10179963B2 (en) 2015-07-27 2019-01-15 Whirlpool Corporation Fabric treating appliance
DE102016203743A1 (de) * 2016-03-08 2017-09-14 BSH Hausgeräte GmbH Wäschepflegegerät mit einem Ablaufschlauch
CN106436193B (zh) * 2016-08-30 2018-10-19 无锡小天鹅股份有限公司 用于滚筒洗衣机的排水组件和具有其的滚筒洗衣机

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987002078A1 (fr) * 1985-10-03 1987-04-09 Miele & Cie. Gmbh & Co. Machine a laver ou machine a laver/sechoir
DE10212136C1 (de) * 2002-03-19 2003-10-30 Siemens Ag Spülventil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006129159A1 *

Also Published As

Publication number Publication date
WO2006129159A1 (fr) 2006-12-07
ITTO20050365A1 (it) 2006-11-30

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