EP1929924A1 - Geschirrspüler - Google Patents

Geschirrspüler Download PDF

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Publication number
EP1929924A1
EP1929924A1 EP06025209A EP06025209A EP1929924A1 EP 1929924 A1 EP1929924 A1 EP 1929924A1 EP 06025209 A EP06025209 A EP 06025209A EP 06025209 A EP06025209 A EP 06025209A EP 1929924 A1 EP1929924 A1 EP 1929924A1
Authority
EP
European Patent Office
Prior art keywords
dishwasher
pump
impeller
filter receptacle
tub
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Withdrawn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
EP06025209A
Other languages
English (en)
French (fr)
Inventor
Stellan Wrangberth
Anders Tolf
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 EP06025209A priority Critical patent/EP1929924A1/de
Priority to PCT/EP2007/009837 priority patent/WO2008067898A1/en
Publication of EP1929924A1 publication Critical patent/EP1929924A1/de
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4202—Water filter means or strainers
    • A47L15/4206—Tubular filters
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4225—Arrangements or adaption of recirculation or discharge pumps
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4246—Details of the tub

Definitions

  • the present disclosure relates to a dishwasher, and especially to an arrangement related to the functional components of a dishwasher.
  • a dishwasher cabinet may need to fit within a space that is 817.5-877.5 mm high, 595 mm wide and 570 mm deep.
  • the functional components of a dishwasher relates to for example, a water circulation system of a dishwasher.
  • the water circulation system comprises a filter receptacle arranged in a bottom of the tub, and a washing pump connected to the filter receptacle via an inlet channel and connected to a sprinkler system in the tub via an outlet channel.
  • the washing pump is arranged to circulate water received from the tub via the filter receptacle such that water is propelled back into the tub via the sprinkler.
  • Prior art document JP 09-117401 shows a dishwasher that is arranged such as to increase storage place for tableware, i.e. to increase the volume and the height of the tub.
  • the washing pump is arranged such that a part of the impeller of the pump is at a higher vertical level than the bottom of the filter receptacle. If the washing pump is arranged on such a high vertical level compared to the filter receptacle, space below the tub can be saved.
  • there is a problem with arranging the washing pump on such a level because air can get into the impeller of the washing pump, which would impair the function of the washing pump, especially if air gets stuck in the impeller or if air is pumped through the pump outlet to the sprinkler.
  • the washing machine For taking care of any air in the pump, the washing machine is arranged with a passage that branches off from the pump outlet. Any air inside the washing pump will be guided through the passage back to the washing tub. Thereby, the pump and the sprinkler can work properly even if there is some air in the pump. Although this arrangement saves space, the placing of the washing pump below the pump, and especially the motor of the washing pump, takes considerable space, which may have been used to increase the tub height.
  • An object of the invention is to create a dishwasher in which the height of the tub is large compared to the total height of the dishwasher.
  • a pump motor driving the impeller can be placed above the impeller in accordance with claim 3. Then space is released below the tub, compared to a horizontal arrangement of the motor, space that could be used for increasing the height of the tub without increasing the total height or volume of the dishwasher.
  • a bottom of the impeller is arranged at the same or a higher vertical level than a filter receptacle bottom.
  • the height of the tub can be increased even more without increasing the total height of the dishwasher, and even more objects can be washed in the dishwasher.
  • the height and volume at the lower part of the tub can be increased further without increasing the total height and volume of the dishwasher.
  • the impeller of a washing pump is arranged on a high vertical level compared to the filter receptacle there is a risk that there is air instead of water in a house of the pump wherein the impeller is situated, when the impeller is actuated. This may result in a malfunction of the impeller.
  • the dishwasher is arranged to be filled with liquid (typically water) before the impeller is actuated, to such an extent that the impeller is at least partly covered with water when the impeller is actuated.
  • liquid typically water
  • the impeller can be placed on e.g. the vertical level indicated in claim 2 without risking malfunction.
  • the pump impeller does not need to be entirely immersed in water during a washing phase, but can operate in a surface region.
  • air ventilation means as provided in claim 7, it is possible to run the pump even with a very low water level, since air drawn through the pump inlet may be removed at the pump outlet.
  • the height of the tub can be increased even more, without increasing the total height of the dishwasher. At the same time the flow of liquid to the pump can be limited or balanced.
  • FIG. 1 shows in cross section a side view of a drawer dishwasher according to an embodiment of the invention.
  • a drawer 1 of a drawer dishwasher comprises a washing tub 2 having a filter receptacle 3 formed in a bottom thereof.
  • the filter receptacle may be generally cylindrical, with a suction opening arranged at a vertical portion thereof, to draw water in a substantially horizontal direction.
  • the filter receptacle 3 is connected by an inlet channel 4 to a washing pump 5.
  • a "pump” is meant a device capable of displacing a gas and/or a liquid from an inlet 5a to an outlet 5b.
  • the washing pump 5 is arranged to suck water from the filter receptacle 3 via the inlet channel 4, and to pump the water back into the tub 2 via an outlet channel 10 to a sprinkler 15 (see fig. 2 ) arranged in the tub 2. In this way, the washing pump 5 is arranged to circulate water in the dishwasher during the washing phase.
  • the washing pump 5 is driven by a drive motor 8 connected to the washing pump 5, via e.g. a rotatable pump axle 7.
  • the washing pump is operated by an impeller 6, driven by the motor 8 via the pump axle 7.
  • the dishwasher may also have a drainage pump (not shown) for pumping water out of the washing machine after the washing phase is completed, or at least after a period of the washing phase is completed.
  • a drainage pump (not shown) for pumping water out of the washing machine after the washing phase is completed, or at least after a period of the washing phase is completed.
  • the impeller 6 of the washing pump 5 is arranged such that it is rotatable around a substantially vertical axis R.
  • An impeller normally has a wider extension in the direction perpendicular to the axis direction compared to in the axis direction.
  • the pump motor 8 when the impeller 6 is arranged such that it is rotatable around a substantially vertical axis, the pump motor 8 may be arranged vertically, in a direction upwards from the pump, outside the tub. Due to this measure, the height of the tub can be increased further without increasing the total height of the dishwasher, compared to the arrangement in JP 09-117401 , wherein the pump motor is arranged horizontally, below the tub, for driving a horizontally arranged impeller. Due to these measures, the whole washing pump 5 of the invention can be placed at the same vertical level or at a higher vertical level than the bottom 3a of the filter receptacle 3.
  • a bottom of the pump is arranged 6 mm above the bottom of the filter receptacle.
  • any air inside the impeller could rather easy be evacuated from the impeller through the pump outlet. This is because when the impeller is rotated around the horizontal axis, the outlet will at a certain occasion in each revolution be on a substantially higher vertical level compared to the inlet, and the air will gravitationally be driven out of the impeller.
  • the height of the tub in relation to the total height of the dishwasher will not be as advantageous with such an arrangement compared to an arrangement with an impeller rotatable around a vertical axis.
  • the inlet and the outlet will be on substantially the same level during a revolution and, since for solving the problem, the height of the impeller has to be low, there is more problematic to get air out of the impeller. Therefore, the pump inlet 5a could be arranged at the underside of the impeller. Also, to lower the risk of malfunction of the impeller due to air stuck in the impeller, the dishwasher may be arranged to be filled with water to such an extent that the impeller is at least partly covered with water when the impeller 6 is actuated by the pump motor 8.
  • the dishwasher is preferably filled with more water after the impeller has been actuated, such that the impeller can be almost totally covered with water. Any possible air is then pushed out of the impeller, when the impeller starts to propel water and air, and the air is vented out e.g. via the air ventilation means 9. Thereby, it is possible that the residual water in the dishwasher, when the dishwasher is not running, could be totally below the impeller 6.
  • the dishwasher has an arrangement 13 for sensing the water level in the washing pump 5 to detect when a pump housing surrounding the impeller 6 is sufficiently filled with water for the filling phase to end and the motor 8 to start driving the impeller.
  • the arrangement 13 for sensing the water level in the pump may be arranged to detect air pressure in a pipe 14, branching from any part of the air and/or liquid transporting system of the dishwasher, preferably downstream from the impeller 6.
  • the branch pipe 14 is directed upwards and is closed in an end proximate to the branching end such that when water enters the branch pipe, the air stuck in the branch pipe is compressed.
  • the arrangement 13 for sensing the water level is preferably a pressure control device.
  • the branch pipe 14 branches off from the lower part of the air ventilation means 9.
  • the arrangement 13 for sensing the water level may also be used during the washing phase to detect that there is enough water in the impeller 6. If the pressure would fall below a certain threshold value, the pressure control device may send a signal that will result in a stop of the motor 8.
  • the water level may be sensed by some kind of floatation device arranged somewhere in the inlet channel 4 or the discharge channel 10.
  • the impeller may operate in the water surface, thereby drawing in both water and air.
  • a ventilation device 9, 9a, 9b is connected to the pump outlet 5b.
  • any air drawn in through the pump will be vented through the ventilation device, while water may be output through the water outlet channel 10 to a sprinkler (not shown) that distributes water onto washed objects placed in the tub 2.
  • the ventilation device 9 When air is drawn through the pump, this is ventilated through the ventilation device 9, 9a, 9b, and when only water is drawn through the pump, a water jet may be provided through the ventilation device.
  • the water jet may be used to provide additional wetting of the washed objects in the tub 2, in addition to the sprinkler.
  • the ventilation device 9 may be connected to the tub 2, through e.g. an opening in the tub.
  • FIG. 2 shows schematically a top view of cross-section of a drawer dishwasher according to an embodiment of the invention.
  • This figure shows the pump motor 8 placed in a corner of the drawer 1, arranged above the impeller 6.
  • the pump motor is manufactured to be sufficiently slim in a horizontal direction, it will not influence the length of a spray arm 15 arranged in the bottom of the tub 2, which spray arm is arranged to, when in use, rotate around its central axis 16 and spray water received from the washing pump 5 through nozzles arranged on the spray arm 15.
  • the pump 5 is connected via the inlet channel 4 to an opening in a substantially vertical surface of the filter receptacle 3, to draw the liquid in a substantially horizontal direction there from, to thereby limiting or balancing the flow of liquid to the pump 5.
  • the filter receptacle 3 is provided with a screen 11 providing a slot 12 between the lower edge of the screen 11 and the bottom 3a of the filter receptacle 3. The slot limits or balances the flow of liquid to the pump 5 with the purpose of achieving an even suction power in all positions of the filter receptacle 3.
  • the filter receptacle 3 By balancing the flow of liquid in this way, the filter receptacle 3 could be produced with a lower height compared to prior art filter receptacles, without risking that air will be sucked into the filter and further to the pump, which would result in a pressure fall in the water circulation system.
  • the flow of liquid is preferably balanced by designing the screen such that the slot between the screen and the bottom of the filter receptacle in each position of the screen is proportional to the distance from the opening of the inlet channel.
  • the filter receptacle 3 is substantially cylindrical and has a horizontal diameter that is more than 1.5 times its vertical height, preferably more than 2 times, most preferably more than 3 times. By this measure, low flow speed is provided through the filter receptacle 3, which minimizes generation of foam, which would otherwise occur when running at a low water level. If the height of the filter receptacle is decreased, the diameter is increased such that the area of the receptacle for water to pass through is kept substantially constant.
  • an upstream portion of the inlet channel 4 has a wider cross section than a downstream portion of the inlet channel 4.
  • a high flow rate can be provided into the pump 5.
  • This is advantageously realized by providing the upstream portion of the inlet channel 4 with a substantially circular cross section, and the downstream portion of the inlet channel 4 with a substantially semi-circular cross section.
  • other realizations can be thought of, such as providing the inlet channel with a continuously narrowing cross-section in the direction of the pump 5.
  • the air ventilation means 9, 9a, 9b comprises an upstream ventilation channel section 9a connected, at a first end, to the pump outlet 5b and a downstream ventilation channel section 9b, connected to a second end of the upstream ventilation channel section 9a.
  • the cross section of the upstream ventilation channel section 9a is larger than the cross-section of the downstream ventilation channel section 9b.
  • the arrangement described in the application could be used in any dishwasher, such as drawer dishwashers. Since the pump 5 is placed inside a drawer of the drawer dishwasher, the total height of the dishwasher drawer can be on a low level, compared to the height of the tub 2. For this reason, the dishwasher will also be easy to handle when a drawer is drawn out of the dishwasher. Also, since the number of components placed outside the drawer is minimized, the risk of components getting stuck and thereby risking damage when a drawer is drawn out is low.
  • the invention may be used in drawer dishwashers with one drawer, or drawer dishwashers with two or more drawers, wherein one drawer is arranged on top of the other drawer(s). In such a multi-drawer dishwasher, the arrangement of the invention may be used in one drawer, in more than one drawer, or in all drawers of the dishwasher.

Landscapes

  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Washing And Drying Of Tableware (AREA)
EP06025209A 2006-12-06 2006-12-06 Geschirrspüler Withdrawn EP1929924A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP06025209A EP1929924A1 (de) 2006-12-06 2006-12-06 Geschirrspüler
PCT/EP2007/009837 WO2008067898A1 (en) 2006-12-06 2007-11-14 Dishwasher

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06025209A EP1929924A1 (de) 2006-12-06 2006-12-06 Geschirrspüler

Publications (1)

Publication Number Publication Date
EP1929924A1 true EP1929924A1 (de) 2008-06-11

Family

ID=38008238

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06025209A Withdrawn EP1929924A1 (de) 2006-12-06 2006-12-06 Geschirrspüler

Country Status (2)

Country Link
EP (1) EP1929924A1 (de)
WO (1) WO2008067898A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011126524A1 (en) * 2010-03-30 2011-10-13 Nidec Motor Corporation Offset inlet dishwasher pumps
IT201700089318A1 (it) * 2017-08-03 2019-02-03 J P Ind S P A Vaschetta di pescaggio o adescamento per macchine lavatrici
EP2816945B1 (de) * 2012-02-24 2021-04-28 Premark FEG L.L.C. Doppelförderpumpe und waschmaschine damit

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US8627832B2 (en) 2010-12-13 2014-01-14 Whirlpool Corporation Rotating filter for a dishwashing machine
US8746261B2 (en) 2009-12-21 2014-06-10 Whirlpool Corporation Rotating drum filter for a dishwashing machine
US9687135B2 (en) 2009-12-21 2017-06-27 Whirlpool Corporation Automatic dishwasher with pump assembly
US9119515B2 (en) 2010-12-03 2015-09-01 Whirlpool Corporation Dishwasher with unitary wash module
US9918609B2 (en) 2009-12-21 2018-03-20 Whirlpool Corporation Rotating drum filter for a dishwashing machine
US8667974B2 (en) 2009-12-21 2014-03-11 Whirlpool Corporation Rotating filter for a dishwashing machine
US9668636B2 (en) 2010-11-16 2017-06-06 Whirlpool Corporation Method and apparatus for dishwasher with common heating element for multiple treating chambers
US9113766B2 (en) 2010-11-16 2015-08-25 Whirlpool Corporation Method and apparatus for dishwasher with common heating element for multiple treating chambers
US9034112B2 (en) 2010-12-03 2015-05-19 Whirlpool Corporation Dishwasher with shared heater
US9107559B2 (en) 2011-05-16 2015-08-18 Whirlpool Corporation Dishwasher with filter assembly
US8733376B2 (en) 2011-05-16 2014-05-27 Whirlpool Corporation Dishwasher with filter assembly
US20120318296A1 (en) 2011-06-20 2012-12-20 Whirlpool Corporation Ultra micron filter for a dishwasher
US9005369B2 (en) 2011-06-20 2015-04-14 Whirlpool Corporation Filter assembly for a dishwasher
US9861251B2 (en) 2011-06-20 2018-01-09 Whirlpool Corporation Filter with artificial boundary for a dishwashing machine
US9010344B2 (en) 2011-06-20 2015-04-21 Whirlpool Corporation Rotating filter for a dishwashing machine
US9265401B2 (en) 2011-06-20 2016-02-23 Whirlpool Corporation Rotating filter for a dishwashing machine
US9301667B2 (en) 2012-02-27 2016-04-05 Whirlpool Corporation Soil chopping system for a dishwasher
US9237836B2 (en) 2012-05-30 2016-01-19 Whirlpool Corporation Rotating filter for a dishwasher
US9730570B2 (en) 2012-05-30 2017-08-15 Whirlpool Corporation Reduced sound with a rotating filter for a dishwasher
US9451862B2 (en) 2012-06-01 2016-09-27 Whirlpool Corporation Dishwasher with unitary wash module
US9532700B2 (en) 2012-06-01 2017-01-03 Whirlpool Corporation Dishwasher with overflow conduit
US9833120B2 (en) 2012-06-01 2017-12-05 Whirlpool Corporation Heating air for drying dishes in a dishwasher using an in-line wash liquid heater
US9554688B2 (en) 2012-10-23 2017-01-31 Whirlpool Corporation Rotating filter for a dishwasher and methods of cleaning a rotating filter

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227546A (en) * 1978-09-06 1980-10-14 The Maytag Company Dishwasher fluid control system
DE8317398U1 (de) * 1982-06-21 1983-10-27 Indesit Industria Elettrodomestici Italiana S.p.A., 10040 Rivalta Geschirrspuelmaschine
WO1993012706A1 (en) * 1991-12-20 1993-07-08 Fisher & Paykel Limited Dishwasher
JPH09117401A (ja) * 1995-10-27 1997-05-06 Matsushita Electric Ind Co Ltd 食器洗い機
WO2001060229A1 (en) * 2000-02-15 2001-08-23 Electrolux Zanussi S.P.A. Dishwashing machine provided with an electric-hydraulic functional unit
JP2002165745A (ja) * 2001-11-30 2002-06-11 Matsushita Electric Ind Co Ltd 食器洗い機
EP1264570A1 (de) * 2000-02-14 2002-12-11 Matsushita Electric Industrial Co., Ltd. Geschirrspülmaschine
JP2003000514A (ja) * 2001-06-19 2003-01-07 Rinnai Corp 引出し式食器洗浄機
EP1417923A2 (de) * 2002-11-05 2004-05-12 Matsushita Electric Industrial Co., Ltd. Geschirrspülmaschine

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227546A (en) * 1978-09-06 1980-10-14 The Maytag Company Dishwasher fluid control system
DE8317398U1 (de) * 1982-06-21 1983-10-27 Indesit Industria Elettrodomestici Italiana S.p.A., 10040 Rivalta Geschirrspuelmaschine
WO1993012706A1 (en) * 1991-12-20 1993-07-08 Fisher & Paykel Limited Dishwasher
JPH09117401A (ja) * 1995-10-27 1997-05-06 Matsushita Electric Ind Co Ltd 食器洗い機
EP1264570A1 (de) * 2000-02-14 2002-12-11 Matsushita Electric Industrial Co., Ltd. Geschirrspülmaschine
WO2001060229A1 (en) * 2000-02-15 2001-08-23 Electrolux Zanussi S.P.A. Dishwashing machine provided with an electric-hydraulic functional unit
JP2003000514A (ja) * 2001-06-19 2003-01-07 Rinnai Corp 引出し式食器洗浄機
JP2002165745A (ja) * 2001-11-30 2002-06-11 Matsushita Electric Ind Co Ltd 食器洗い機
EP1417923A2 (de) * 2002-11-05 2004-05-12 Matsushita Electric Industrial Co., Ltd. Geschirrspülmaschine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011126524A1 (en) * 2010-03-30 2011-10-13 Nidec Motor Corporation Offset inlet dishwasher pumps
EP2816945B1 (de) * 2012-02-24 2021-04-28 Premark FEG L.L.C. Doppelförderpumpe und waschmaschine damit
IT201700089318A1 (it) * 2017-08-03 2019-02-03 J P Ind S P A Vaschetta di pescaggio o adescamento per macchine lavatrici
WO2019025849A1 (en) * 2017-08-03 2019-02-07 J.P. Industries S.P.A. PRIMING OR SUCTION TANK FOR WASHING MACHINES

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