EP3015587A1 - Waschmaschine - Google Patents

Waschmaschine Download PDF

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Publication number
EP3015587A1
EP3015587A1 EP14190484.7A EP14190484A EP3015587A1 EP 3015587 A1 EP3015587 A1 EP 3015587A1 EP 14190484 A EP14190484 A EP 14190484A EP 3015587 A1 EP3015587 A1 EP 3015587A1
Authority
EP
European Patent Office
Prior art keywords
drain
washing machine
pump
drain pump
float
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Withdrawn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
EP14190484.7A
Other languages
English (en)
French (fr)
Inventor
Tobias Bronn
Thomas Gross
Rainer Schuster
Ulrich Stegemeyer
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 EP14190484.7A priority Critical patent/EP3015587A1/de
Publication of EP3015587A1 publication Critical patent/EP3015587A1/de
Withdrawn legal-status Critical Current

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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
    • 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

Definitions

  • the present invention relates to a washing machine comprising a tub having a sump portion with a float and a drain line downwards the sump portion with a drain pump, said float being configured to prevent communication between the sump portion and the drain line when the drain pump is switched off and a liquid is present in the drain line.
  • This kind of washing machine is well known in the art, and it is disclosed for instance by US 4821537 .
  • Said float called also eco-ball in the industry, is driven by a back pressure deriving from the presence of washing liquid or water in the drain line after the drain pump has switched off.
  • the purpose of the float is mainly to prevent the dispensed detergent from sinking down into the drain line.
  • the water will fill the drain pump and will also flow up the circulating line which is connected to the top of the wash unit. This can be considered as a pressure peak. If now during the spinning where vibrations are present some foam is built up in the empty pump housing the pressure peak will lift up the foam inside the re-circulation hose. That can be visible for customer as undesired foam spite on the door glass or laundry.
  • a flap valve to the drain line, for instance at the drain pump outlet or in the drain line (close to pump), the pressure peak when drain pump is switched off will be entirely avoided and there will not be any remaining water inside drain hose that can start to pulse generating undesired noise.
  • the flap valve according to the invention is working more or less like a check valve or flow reducer, and in order to ensure the functionality of the float of the known washer eco system, the flap has a predetermined water leak, for instance created by having one or more very small opening(s) to allow the remaining water to flow back towards wash unit at very low flow and speed to seal the eco system.
  • a known washer 10 presents a tub 14 having a sump 12 using an eco-ball system 13 (whose float is indicated with reference numeral 13a).
  • an eco-ball system 13 whose float is indicated with reference numeral 13a.
  • a rotating drum 16 is mounted, and the tub 14 is sealed due to the buoyancy of the float 13a and of difference of water level D between water level A inside the tub 14 and water level B in a drain hose 18.
  • a drain pump 20 Downstream the eco-ball system 13 a drain pump 20 is mounted, which is figure 1 is shown as idle ("off").
  • FIG 2 the same washing machine of figure 1 is shown in a final phase of draining, i.e. when the drain pump 20 is running, the eco-ball system 13 is in an open configuration, there is a sort of air and water mixture in the pump 20 and the water column inside the drain hose 18 starts pulsating and generating annoying noises.
  • FIG 3 a washing machine according to the invention is shown, where for similar or identical components the same reference numbers of figures 1 and 2 are used.
  • a flap valve 22 is placed in the drain hose 18 which is opened by the water flow delivered by the drain pump 18 and behaves like a check valve.
  • the washing machine 10 is shown at the end of the draining phase, i.e. when the tub 14 is empty and no water remains to feed the drain pump 20. Due to the use of the flap valve 22, an uncoupling is realized between the water column inside drain hose 18 and air and water mixture inside the drain pump 20. In this configuration the flap valve 22 is in its closed position, while annoying pulsating noise is prevented. As shown in figure 5 , the flap valve 22 present a central small hole 22a of about 3 to 5 mm which allows the water column inside drain hose 18, once the drain pump 20 is switched off, to flow back smoothly to the eco-ball system 13, so that such system is able again to seal the tub 14.
  • FIG 6 a second embodiment of the invention is shown, particularly with reference to a washing machine having a circulating line 26 and a circulation pump 28.
  • a washing machine having a circulating line 26 and a circulation pump 28.
  • the flap valve 22 or similar non return valve with controlled leakage in the drain hose 18 downstream the drain pump 20 allows a smooth water back flow of washing liquid and a slow equalization of water level in the drain hose 18 and in the circulating line 26. This prevents possible foam spits into the drum 16 or over door glass (not shown) when drain pump 20 is switched off.
EP14190484.7A 2014-10-27 2014-10-27 Waschmaschine Withdrawn EP3015587A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14190484.7A EP3015587A1 (de) 2014-10-27 2014-10-27 Waschmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14190484.7A EP3015587A1 (de) 2014-10-27 2014-10-27 Waschmaschine

Publications (1)

Publication Number Publication Date
EP3015587A1 true EP3015587A1 (de) 2016-05-04

Family

ID=51790620

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14190484.7A Withdrawn EP3015587A1 (de) 2014-10-27 2014-10-27 Waschmaschine

Country Status (1)

Country Link
EP (1) EP3015587A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3041594A1 (de) * 1980-11-04 1982-05-13 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Waschmaschine mit einer vorrichtung zum zurueckfuehren der ablaufenden lauge
US4821537A (en) 1985-10-03 1989-04-18 Miele & Cie. Gmbh & Co. Washing machine or washing drying machine with devices to avoid losses of washing agent
DE4316598A1 (de) * 1993-05-18 1994-11-24 Licentia Gmbh Trommelwaschmaschine
WO2006129159A1 (en) * 2005-05-30 2006-12-07 Indesit Company S.P.A. Washing machine with non-return valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3041594A1 (de) * 1980-11-04 1982-05-13 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Waschmaschine mit einer vorrichtung zum zurueckfuehren der ablaufenden lauge
US4821537A (en) 1985-10-03 1989-04-18 Miele & Cie. Gmbh & Co. Washing machine or washing drying machine with devices to avoid losses of washing agent
DE4316598A1 (de) * 1993-05-18 1994-11-24 Licentia Gmbh Trommelwaschmaschine
WO2006129159A1 (en) * 2005-05-30 2006-12-07 Indesit Company S.P.A. Washing machine with non-return valve

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