EP2294962B1 - Wash arm arrangement for a dishwasher - Google Patents

Wash arm arrangement for a dishwasher Download PDF

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Publication number
EP2294962B1
EP2294962B1 EP10178371.0A EP10178371A EP2294962B1 EP 2294962 B1 EP2294962 B1 EP 2294962B1 EP 10178371 A EP10178371 A EP 10178371A EP 2294962 B1 EP2294962 B1 EP 2294962B1
Authority
EP
European Patent Office
Prior art keywords
arm
support arm
spray
liquid
dishwasher
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
EP10178371.0A
Other languages
German (de)
French (fr)
Other versions
EP2294962A1 (en
Inventor
Anders Haegermarck
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 PL10178371T priority Critical patent/PL2294962T3/en
Publication of EP2294962A1 publication Critical patent/EP2294962A1/en
Application granted granted Critical
Publication of EP2294962B1 publication Critical patent/EP2294962B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • A47L15/14—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber
    • A47L15/18—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber with movably-mounted spraying devices
    • A47L15/22—Rotary spraying devices
    • A47L15/23—Rotary spraying devices moved by means of the sprays

Definitions

  • This invention relates to a wash arm arrangement for a dishwasher comprising a treatment chamber having one or several freely rotating support arms that are provided with one or several freely rotating spray arms through which liquid is distributed to the dish in the treatment chamber.
  • Conventional dishwashers of the household type are usually provided with an upper and a lower rotating wash arm provided with several spray nozzles distributing the cleaning liquid to the dish which is placed in the treatment chamber. At least one of the nozzles is arranged such that a reaction force is created causing the wash arm to rotate.
  • These spray systems have the disadvantage that the each spray of the rotating nozzle hits the same circle every revolution.
  • the purpose of this invention is, contrary to traditional wash arm systems, to use a dishwasher spraying system that is distributing the liquid in a non uniform way by driving the support arm in incremental steps. This means that a more effective and faster washing can be achieved resulting in less water and energy consumption. It also means a simple and cheap wash arm arrangement using a freely rotating support arm that is provided with a freely rotating spray arm for driving the support arm. The arrangement is such that all the liquid used in the washing procedure is arranged to flow through the spray nozzle and there is consequently no loss of flow in order to drive the support arm separately.
  • FIG. 1 shows a perspective view of a dishwasher according to the invention
  • Fig. 2 is a schematic plan view of the wash arm arrangement according to the invention
  • Fig. 3 is a section on the line III-III in Fig 2
  • Fig 4 shows the driving forces of the spray arm and the support arm.
  • Fig. 1 shows a dishwasher 10 having a treatments chamber 11 in which dish is inserted on a lower and an upper basket 12 and 13.
  • the treatment chamber is provided with a door 14 and has a wash arm arrangement 15 placed below the lower basket 12 as well as below the upper basket 13.
  • the dishwasher is in a conventional manner provided with a circulation pump that distributes a cleaning liquid from a collecting container at the bottom of the treatment chamber to the wash arm arrangement from which it is sprayed towards the dish which is placed on the baskets.
  • the wash arm arrangement 15 comprises a support arm 16 that is rotating freely on a feeding duct 17 to which the cleaning liquid is supplied by said circulation pump.
  • the support arm has a closed structure with the exception of an inlet opening 18 placed at the feeding duct 17 and an outlet sleeve 19 at the outer end of the support arm.
  • the outlet sleeve 19 supports a spray arm 20 that rotates freely on the sleeve.
  • the spray arm is provided with several nozzles 21 that direct the flow mainly vertically towards the dish.
  • the spray arm is further provided with an additional nozzle 22 at one of its ends through which a cleaning liquid jet is directed obliquely upwards or sideways.
  • the arrangement operates in the following way. Cleaning liquid is distributed from the feeding duct 17 via the opening 18 into the support arm 16 and further through the outlet sleeve 19 and the nozzles 21 via the spray arm 20. Simultaneously liquid is flowing out through the nozzle 22 mainly perpendicular to the length direction of the spray arm 20 causing a horizontal driving force F on the spray arm. This force F creates a momentum about the sleeve 19 such that the spray arm 20 starts to rotate. The rotation of the spray arm 20 generates a friction momentum C at the sleeve 19 that forces the support arm 16 to rotate.
  • the force F is transmitted to the support arm 16 through the sleeve 19 by its component F1 parallel to the support arm 16 and F2 perpendicular to it.
  • Component F2 creates a momentum around the feeding duct 17 which is added up to the friction momentum C at the sleeve 19 and contributes to the rotation of the support arm 16.
  • the support arm 16 rotates with periodical angular velocity originated by a constant component C (friction given by satellite rotation) added up to a periodical one given by the component F2 of the force F.
  • the support arm 16 is rotated in incremental steps. Due to that the increment steps are not fixed the position of the sprays will vary continuously thereby minimizing the risk for areas not being washed.
  • the system creates a heavy flow directed at the items above the wash arm and this flow transports the dirt away in an efficient manner.

Landscapes

  • Washing And Drying Of Tableware (AREA)

Abstract

This invention relates to a wash arm arrangement for a dishwasher comprising a treatment chamber (11) having one or several freely rotating support arms (16) that are provided with one or several freely rotating spray arms (20) through which liquid is distributed to the dish in the treatment chamber (11). All the movement of the support arm (16) is created as reaction forces and/or moments from the spray out of the spray arm (20).

Description

  • This invention relates to a wash arm arrangement for a dishwasher comprising a treatment chamber having one or several freely rotating support arms that are provided with one or several freely rotating spray arms through which liquid is distributed to the dish in the treatment chamber.
  • Conventional dishwashers of the household type are usually provided with an upper and a lower rotating wash arm provided with several spray nozzles distributing the cleaning liquid to the dish which is placed in the treatment chamber. At least one of the nozzles is arranged such that a reaction force is created causing the wash arm to rotate. These spray systems have the disadvantage that the each spray of the rotating nozzle hits the same circle every revolution.
  • There also are previously known dishwasher arrangements, see for instance US 5477874 or DE 4416655 , operating with one or several rotating support arms on which a spray arm is rotating. The support arm as well as the spray arm are provided with several spray nozzles some of which are directed such that a horizontal force component is created directly on the support arm as well as the spray arm causing the two arms to rotate. This means that a part of the flow is used to rotate the support arm.
  • Another type of wash arm arrangement is shown in EP 727177 . According to this arrangement there is a reciprocating support arm provided with a rotating spray arm at each end. The support arm achieves its reciprocating motion by means of nozzles provided at the spray arms and the spray arms are mutually connected by means of a gear mechanism in order to synchronize the motion of the spray arms such that a balanced uniform motion is created. This is however a complicated and rather expensive solution.
  • The purpose of this invention is, contrary to traditional wash arm systems, to use a dishwasher spraying system that is distributing the liquid in a non uniform way by driving the support arm in incremental steps. This means that a more effective and faster washing can be achieved resulting in less water and energy consumption. It also means a simple and cheap wash arm arrangement using a freely rotating support arm that is provided with a freely rotating spray arm for driving the support arm. The arrangement is such that all the liquid used in the washing procedure is arranged to flow through the spray nozzle and there is consequently no loss of flow in order to drive the support arm separately.
  • An embodiment of the invention will now be described with reference to the accompanying drawing on which Fig. 1 shows a perspective view of a dishwasher according to the invention, Fig. 2 is a schematic plan view of the wash arm arrangement according to the invention, Fig. 3 is a section on the line III-III in Fig 2 whereas Fig 4 shows the driving forces of the spray arm and the support arm.
  • Fig. 1 shows a dishwasher 10 having a treatments chamber 11 in which dish is inserted on a lower and an upper basket 12 and 13. The treatment chamber is provided with a door 14 and has a wash arm arrangement 15 placed below the lower basket 12 as well as below the upper basket 13. The dishwasher is in a conventional manner provided with a circulation pump that distributes a cleaning liquid from a collecting container at the bottom of the treatment chamber to the wash arm arrangement from which it is sprayed towards the dish which is placed on the baskets.
  • The wash arm arrangement 15 comprises a support arm 16 that is rotating freely on a feeding duct 17 to which the cleaning liquid is supplied by said circulation pump. The support arm has a closed structure with the exception of an inlet opening 18 placed at the feeding duct 17 and an outlet sleeve 19 at the outer end of the support arm. The outlet sleeve 19 supports a spray arm 20 that rotates freely on the sleeve. The spray arm is provided with several nozzles 21 that direct the flow mainly vertically towards the dish. The spray arm is further provided with an additional nozzle 22 at one of its ends through which a cleaning liquid jet is directed obliquely upwards or sideways.
  • The arrangement operates in the following way. Cleaning liquid is distributed from the feeding duct 17 via the opening 18 into the support arm 16 and further through the outlet sleeve 19 and the nozzles 21 via the spray arm 20. Simultaneously liquid is flowing out through the nozzle 22 mainly perpendicular to the length direction of the spray arm 20 causing a horizontal driving force F on the spray arm. This force F creates a momentum about the sleeve 19 such that the spray arm 20 starts to rotate. The rotation of the spray arm 20 generates a friction momentum C at the sleeve 19 that forces the support arm 16 to rotate. At the same time the force F is transmitted to the support arm 16 through the sleeve 19 by its component F1 parallel to the support arm 16 and F2 perpendicular to it. Component F2 creates a momentum around the feeding duct 17 which is added up to the friction momentum C at the sleeve 19 and contributes to the rotation of the support arm 16. Eventually the support arm 16 rotates with periodical angular velocity originated by a constant component C (friction given by satellite rotation) added up to a periodical one given by the component F2 of the force F. By choosing suitable friction at the feeding duct 17 and at the sleeve 19 the support arm 16 is rotated in incremental steps. Due to that the increment steps are not fixed the position of the sprays will vary continuously thereby minimizing the risk for areas not being washed. Thus, the system creates a heavy flow directed at the items above the wash arm and this flow transports the dirt away in an efficient manner.

Claims (8)

  1. Dishwasher comprising a treatment chamber (11) and a wash arm arrangement having one or several freely rotating support arms (16) that are provided with one or several freely rotating spray arms (20) for driving the support arm (16), through which spray arm (20) liquid is distributed to the dish in the treatment chamber,
    characterized in that
    the liquid is distributed in a non uniform way by driving the support arm (16) in incremental steps,
    whereby the spray arm (20) is provided with at least one nozzle (22) arranged such that one horizontal reaction force component (F) from the jet flowing out from the nozzle creates a moment (C) for the spray arm (20) about its rotation centre as well as a moment (M) for the support arm (16) about its rotation centre, and
    whereby a suitable friction at the supporting means (17, 19) of the spray arm (20) and of the support arm (16) is chosen to achieve the rotation of the support arm (16) in incremental steps.
  2. Dishwasher according to claim 1, characterized in that all the movement of the support arm is created as reaction forces and/or moments from the spray out of the spray arm.
  3. Dishwasher according to claim 1 or 2, characterized in that all the liquid which is fed to the support arm (16) is arranged to flow out into the treatment chamber through the spray arm (20).
  4. Dishwasher according to any of claims 1-3, characterized in that the support arm (16) is a closed structure having one liquid inlet (18) and one liquid outlet (19).
  5. Dishwasher according to any of claims 1-4, characterized in that the spray arm (20) is provided with at least one nozzle (22) arranged such that one horizontal reaction force component (F) from the jet flowing out from the nozzle creates a moment (C) for the spray arm (20) about its rotation centre as well as a moment (M) for the support arm (16) about its rotation centre.
  6. Dishwasher according to any of claims 1-5, characterized in that the dishwasher is provided with at least one liquid feeding duct (17) on which the support arm is arranged to rotate.
  7. Dishwasher according to claim 6, characterized in that said support arm (16) is comprising an outlet sleeve (19) that supports a spray arm (20) freely rotating on the sleeve (19), and that a suitable friction at the feeding duct (17) and at the sleeve (19) is chosen to achieve the rotation of the support arm (16) in incremental steps.
  8. Dishwasher according to claim 7, characterized in that the support arm (16) is a closed structure having one liquid inlet (18) placed at the feeding duct (17) and one liquid outlet which is said outlet sleeve (19).
EP10178371.0A 2003-08-29 2004-08-24 Wash arm arrangement for a dishwasher Expired - Lifetime EP2294962B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10178371T PL2294962T3 (en) 2003-08-29 2004-08-24 Wash arm arrangement for a dishwasher

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0302325A SE0302325D0 (en) 2003-08-29 2003-08-29 Device for a dishwasher
EP04445085A EP1510168B1 (en) 2003-08-29 2004-08-24 Wash arm arrangement for a dishwasher

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP04445085A Division EP1510168B1 (en) 2003-08-29 2004-08-24 Wash arm arrangement for a dishwasher
EP04445085.6 Division 2004-08-24

Publications (2)

Publication Number Publication Date
EP2294962A1 EP2294962A1 (en) 2011-03-16
EP2294962B1 true EP2294962B1 (en) 2016-01-13

Family

ID=28673219

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10178371.0A Expired - Lifetime EP2294962B1 (en) 2003-08-29 2004-08-24 Wash arm arrangement for a dishwasher
EP04445085A Expired - Lifetime EP1510168B1 (en) 2003-08-29 2004-08-24 Wash arm arrangement for a dishwasher

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP04445085A Expired - Lifetime EP1510168B1 (en) 2003-08-29 2004-08-24 Wash arm arrangement for a dishwasher

Country Status (4)

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EP (2) EP2294962B1 (en)
AT (1) ATE521271T1 (en)
PL (2) PL2294962T3 (en)
SE (1) SE0302325D0 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004043772A1 (en) * 2004-09-10 2006-03-30 Electrolux Home Products Corp. N.V. Dishwasher with a spraying device
EP2215952A1 (en) 2009-02-09 2010-08-11 Electrolux Home Products Corporation N.V. Spray arm assembly for a dishwasher
ATE525008T1 (en) * 2009-07-28 2011-10-15 Electrolux Home Prod Corp SPRAY ARM ASSEMBLY FOR DISHWASHER
EP2389851B1 (en) * 2010-05-25 2013-10-16 Electrolux Home Products Corporation N.V. Wash arm arrangement for a dishwasher
KR101764293B1 (en) * 2012-09-07 2017-08-03 삼성전자주식회사 Nozzle assembly for dish washer and dish washer having the same
US10667668B2 (en) 2013-06-27 2020-06-02 Whirlpool Corporation Dishwasher with rotationally mounted sprayer
CA2935896A1 (en) 2014-03-24 2015-10-01 Electrolux Appliances Aktiebolag Dishwasher comprising at least one dishwasher spray arm
DE102015225331A1 (en) * 2015-12-15 2017-06-22 Haier Deutschland GmbH Dishwasher, sprayer for a dishwasher and method for operating a dishwasher
US11191417B2 (en) * 2016-07-08 2021-12-07 Electrolux Appliances Aktiebolag Wash arm assembly
EP3481270B1 (en) * 2016-07-08 2021-09-08 Electrolux Appliances Aktiebolag Wash arm assembly and dishwasher comprising wash arm assembly
CN109965816B (en) * 2017-12-28 2024-01-16 宁波方太厨具有限公司 Cleaning machine
CN113693533A (en) * 2021-08-30 2021-11-26 珠海格力电器股份有限公司 Dish washing machine, washing control method thereof and spray arm washing method

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1600196A (en) * 1968-12-31 1970-07-20
CH519902A (en) * 1970-01-29 1972-03-15 Frame Sa Spray rotor of an industrial glass and dishwashing machine
US3771725A (en) * 1972-05-12 1973-11-13 Gen Electric Washing appliance having an improved spray arm assembly
US5477874A (en) 1993-08-13 1995-12-26 Matsushita Electric Industrial Co., Ltd. Dishwasher
DE4416655A1 (en) * 1994-05-11 1995-11-16 Heinz Gutoehrlein Spray arm for domestic electric dishwashing machine
IT1275155B (en) * 1995-02-15 1997-07-30 Smeg Spa REVOLVING DISHWASHER GROUP FOR DISHWASHER EQUIPPED WITH A HORIZONTAL ALTERNATE MOTOR
IT1275156B (en) 1995-02-15 1997-07-30 Smeg Spa REVOLVING DISHWASHER GROUP FOR DISHWASHER EQUIPPED WITH A HORIZONTAL ALTERNATE MOTOR

Also Published As

Publication number Publication date
EP1510168B1 (en) 2011-08-24
PL2294962T3 (en) 2016-06-30
EP2294962A1 (en) 2011-03-16
EP1510168A3 (en) 2006-05-10
PL1510168T3 (en) 2012-01-31
SE0302325D0 (en) 2003-08-29
ATE521271T1 (en) 2011-09-15
EP1510168A2 (en) 2005-03-02
EP1510168A9 (en) 2010-12-08

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