EP0772994B1 - Hydaulikkreislauf für eine Geschirrspülmaschine - Google Patents

Hydaulikkreislauf für eine Geschirrspülmaschine Download PDF

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Publication number
EP0772994B1
EP0772994B1 EP96117864A EP96117864A EP0772994B1 EP 0772994 B1 EP0772994 B1 EP 0772994B1 EP 96117864 A EP96117864 A EP 96117864A EP 96117864 A EP96117864 A EP 96117864A EP 0772994 B1 EP0772994 B1 EP 0772994B1
Authority
EP
European Patent Office
Prior art keywords
enlargement
dishwashing machine
tubular element
machine according
spraying
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
EP96117864A
Other languages
English (en)
French (fr)
Other versions
EP0772994A1 (de
Inventor
Giuseppe Marchitto
Fabio Roncati
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
Merloni Elettrodomestici 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 Merloni Elettrodomestici SpA filed Critical Merloni Elettrodomestici SpA
Publication of EP0772994A1 publication Critical patent/EP0772994A1/de
Application granted granted Critical
Publication of EP0772994B1 publication Critical patent/EP0772994B1/de
Anticipated expiration legal-status Critical
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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

  • the present invention refers to a dishwashing machine, comprising a washing chamber housing at least a crockery basket, to which a tubular element is associated within which a fluid is flowing from a pump, one end of said tubular element being connected with a rotary spraying element, where said spraying element has at least two arms, in particular opposite to each other, and where said tubular duct is engaged with the spraying element substantially in the joining area of said arms.
  • dishwashing machines It is known for dishwashing machines to be equipped with a washing chamber housing both an upper crockery basket and a lower crockery basket.
  • the crockery are washed through two rotating sprayers, which spray the wash liquid onto the crockery contained in each basket and are fed with pressurized liquid from a proper washing pump located in the machine basement.
  • the lower sprayer is generally fed and supported directly by the pump body through a tubular element coming from the bottom, whereas the upper sprayer can be fed in several ways through a special hydraulic circuit originating from said pump.
  • a first known technology in this respect is to provide a nozzle in the ceiling of the washing chamber fed through a duct from the pump, which sends a fluid jet downwards. This jet covers a run in the air before reaching a special funnel-shaped receiving element secured to the upper basket of the machine, which supports the upper sprayer in communication with it.
  • a dishwashing machine comprising a washing chamber housing at least a crockery basket to which a tubular element is associated, within which liquid coming from a pump flows; one end of said tubular element is connected to a rotating spraying element, which comprises two arms, where said tubular element is engaged with the spraying element substantially in the joining area of said arms; in said joining area the spraying element has a substantial enlargement with respect to its prevailing section, said enlargement developing according to a direction being substantially parallel to the section of the inlet of the spraying element.
  • Dishwashers of the known type have some problems concerning the wash-liquid flow within the sprayers; in particular, the sprayers of the known type are subject to charge losses, i.e. dissipation effects of the fluid pressure, bound to existing discontinuities in the hydraulic ducts.
  • the machine according to the present invention indicated by reference number 1 as a whole comprises a supporting frame 2 defining a washing tub 3 inside.
  • Number 4 indicates a vertical tubular element whose upper end is coupled with a lower sprayer 5 provided for the washing of the crockery contained in a lower basket 6 of the dishwasher.
  • the lower end of the tubular element 4 is connected with the delivery side of a pump indicated with P.
  • Number 7 indicates an upper crockery basket supporting a tubular element indicated with 8; an end of the tubular element 8 is connected with and supports an upper sprayer 9 provided for the washing of the crockery contained in the basket 7; the other end of the tubular element 8 is coupled during operation with an hydraulic take-off 10 forming part of an hydraulic circuit 11 fed by the pump P.
  • the sprayers 5 and 9 of the machine according to the present invention are obtained through a substantially similar technology; therefore, only the lower sprayer 5 will be detailed in the following description for simplicity's sake.
  • the sprayer 5 has two arms 7a and 7b, extending radially from opposite sides in respect to the tubular element 4 and provided with a plurality of spraying nozzles B for the washing fluid, which are so directed to splash all the crockery placed inside the basket 6 with a pressurized washing liquid fed through the tubular element 6 and the pair of arms 7a and 7b.
  • the coupling system between the tubular element 4 and the sprayer 5 is of the known type, which does not require any deeper description in this contest, as it will be enough to affirm that such a coupling allows the sprayer 5 to rotate.
  • Said rotation of the sprayer 5 occurs substantially around the axis of the tubular element 4 and is obtained through at least a couple of nozzles B delivering a part of the washing liquid along a direction having a tangential component to the circular path to be described by the sprayer.
  • an enlargement of the sprayer section having a concave profile indicated by 12, is defined on the upper internal surface of the sprayer 5 substantially in the joining area of both arms 7a and 7b.
  • the concavity of said profile is opposed to the liquid flow coming from the tubular element 4.
  • the profile 12 has a substantially general elliptic shape: such a profile can be obtained for instance by a simple drawing operation of the sprayer upper side 5, if made of metallic material, or by a simple molding operation in case the sprayer is made of plastic material.
  • the operation of the dishwashing machine, concerning the lower sprayer 5 is as follows.
  • the liquid jet coming from the pump P first enters the tubular element 4 and from here the sprayer 5.
  • the enlargement obtained by the profile 12 presets a liquid volume to the arms 7a and 7b being sufficient to attenuate the liquid jet further coming from the tubular element 4; thus, the enlargement obtained by the profile 12 allows to obtain a pressure tank.
  • a dishwashing machine comprising a spraying element, where the charge losses are reduced in a simple and low-cost manner, so as to increase washing efficiency in respect to the machines of the known type.
  • Another possible embodiment is to provide an enlargement also on the lower internal surface of the sprayer 5; this can be obtained by drawing or molding, or by properly shaping the joining area between the tubular element 4 and the sprayer 5.
  • the entire sprayer section i.e. the prevailing section of the arms 7a and 7b may not only have the above concave profile but also a substantially elliptic configuration.
  • the shape of the profile 12, which is concave and elliptic in the example, may be changed without modifying its function to obtain a pressure tank for the liquid flowing through both sprayer arms.
  • the above enlargement of the sprayer section may globally have a substantially spherical configuration.

Claims (9)

  1. Geschirrspülmaschine, enthaltend eine Waschkammer (3), die zumindest einen Geschirrkorb (6) aufnimmt, zu dem ein rohrförmiges Element (4) gehört, in dessen Innerem eine von einer Pumpe kommende Flüssigkeit strömt, wobei ein Ende des rohrförmigen Elementes (4) mit einem sich drehenden Sprühelement (5) verbunden ist, das zumindest zwei Arme (7a, 7b), die insbesondere einander gegenüberliegend angeordnet sind, enthält, und wobei das rohrförmige Element (4) mit dem Sprühelement (5) im Wesentlichen im Verbindungsbereich der Arme (7a, 7b) in Eingriff steht, wobei das Sprühelement (5) in dem Verbindungsbereich eine wesentliche Erweiterung (12) gegenüber seinem vorherrschenden Querrschnitt aufweist,
    dadurch gekennzeichnet, dass sich die Erweiterung (12) in eine Richtung entwickelt, die im Wesentlichen senkrecht zu dem Einlassabschnitt des Sprühelementes (4) verläuft, wobei die Erweiterung (12) vorgesehen ist, um einen Tank zu bilden, welcher die Geschwindigkeit der Flüssigkeit, die aus dem rohrförmigen Element (4) austritt, in Druck umwandelt, und/oder um ein Flüssigkeitsvolumen zu den Armen (7a, 7b) voreinzustellen, welches ausreichend ist, den Flüssigkeitsstrahl, welcher von dem rohrförmigen Element (4) weiterhin austritt, abzuschwächen.
  2. Geschirrspülmaschine nach Anspruch 1,
    dadurch gekennzeichnet, dass die Erweiterung (12) zumindest teilweise auf der innenliegenden Oberfläche des Sprühelementes (5) gegenüberliegend zu der Oberfläche ausgebildet ist, die im Eingriff mit dem rohrförmigen Element (4) steht.
  3. Geschirrspülmaschine nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass die Erweiterung zumindest aus einem im Wesentlichen konkaven Profilabschnitt (12) der innenliegenden Oberfläche des Sprühelementes (5) gebildet ist, wobei die Konkavität des Profilabschnitts (12) dem Flüssigkeitsstrom, der aus dem rohrförmigen Element (4) austritt, gegenüberliegt.
  4. Geschirrspülmaschine nach zumindest einem der vorstehenden Ansprüche,
    dadurch gekennzeichnet, dass die Erweiterung bzw. der konkave Profilabschnitt (12) eine im Wesentlichen elliptische Ausgestaltung besitzt.
  5. Geschirrspülmaschine nach zumindest einem der vorstehenden Ansprüche,
    dadurch gekennzeichnet, dass die Erweiterung bzw. der konkave Profilabschnitt (12) durch einen Ziehvorgang oder durch einen Gießvorgang des Abschnittes des Sprühelementes (5), wo er vorgesehen werden soll, erhalten wird.
  6. Geschirrspülmaschine nach zumindest einem der vorstehenden Ansprüche,
    dadurch gekennzeichnet, dass eine Erweiterung (12) ebenfalls an der gleichen innenliegenden Oberfläche des Sprühelementes (5), die in Eingriff mit dem rohrförmigen Element (4) steht, ausgebildet ist.
  7. Geschirrspülmaschine nach dem vorstehenden Anspruch,
    dadurch gekennzeichnet, dass die Erweiterung (12) durch einen Ziehvorgang oder durch einen Gießvorgang, d. h. durch geeignetes Verformen des Kupplungsbereiches zwischen dem rohrförmigen Element (4) und dem Sprühelement (5) gebildet ist.
  8. Geschirrspülmaschine nach zumindest einem der vorstehenden Ansprüche,
    dadurch gekennzeichnet, dass die Arme (7a, 7b) vorwiegend eine im Wesentlichen elliptische Form aufweisen.
  9. Geschirrspülmaschine nach zumindest einem der vorstehenden Ansprüche,
    dadurch gekennzeichnet, dass die Erweiterung (12) eine im Wesentlichen kugelförmige Gesamtform aufweist.
EP96117864A 1995-11-10 1996-11-07 Hydaulikkreislauf für eine Geschirrspülmaschine Expired - Lifetime EP0772994B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT95TO000909A IT1280478B1 (it) 1995-11-10 1995-11-10 Macchina lavastoviglie a circuito idraulico migliorato
ITTO950909 1995-11-10

Publications (2)

Publication Number Publication Date
EP0772994A1 EP0772994A1 (de) 1997-05-14
EP0772994B1 true EP0772994B1 (de) 2002-04-17

Family

ID=11413954

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96117864A Expired - Lifetime EP0772994B1 (de) 1995-11-10 1996-11-07 Hydaulikkreislauf für eine Geschirrspülmaschine

Country Status (4)

Country Link
EP (1) EP0772994B1 (de)
DE (1) DE69620709T2 (de)
ES (1) ES2175010T3 (de)
IT (1) IT1280478B1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19812329C1 (de) * 1998-03-20 1999-06-10 Whirlpool Co Geschirrspülmaschine mit dreh- und abnehmbarem Sprüharm
US6431188B1 (en) * 2000-04-03 2002-08-13 Whirlpool Corporation Dishwasher spray arm feed system
CN100423680C (zh) * 2003-09-28 2008-10-08 乐金电子(天津)电器有限公司 洗碗柜喷射器
DE102006007327A1 (de) 2006-02-16 2007-08-30 BSH Bosch und Siemens Hausgeräte GmbH Geschirrspülmaschine mit Sprühvorrichtung
US8732652B2 (en) 2007-06-15 2014-05-20 Blackberry Limited System and method for creating multi-mode applications
CN109414149B (zh) 2016-07-08 2022-03-22 伊莱克斯电器股份公司 洗涤臂组件和洗碗机
WO2019086107A1 (en) 2017-10-31 2019-05-09 Electrolux Appliances Aktiebolag Wash arm assembly
EP3703547B1 (de) 2017-10-31 2024-03-13 Electrolux Appliances Aktiebolag Sprüharmanordnung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1308314A1 (ru) * 1985-10-08 1987-05-07 Всесоюзный Научно-Исследовательский Экспериментально-Конструкторский Институт Электробытовых Машин И Приборов Разбрызгиватель посудомоечной машины

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5449011A (en) * 1993-10-08 1995-09-12 General Electric Company Dish washing machine with improved wash mechanism

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1308314A1 (ru) * 1985-10-08 1987-05-07 Всесоюзный Научно-Исследовательский Экспериментально-Конструкторский Институт Электробытовых Машин И Приборов Разбрызгиватель посудомоечной машины

Also Published As

Publication number Publication date
ITTO950909A1 (it) 1997-05-10
IT1280478B1 (it) 1998-01-20
EP0772994A1 (de) 1997-05-14
ITTO950909A0 (de) 1995-11-10
DE69620709D1 (de) 2002-05-23
ES2175010T3 (es) 2002-11-16
DE69620709T2 (de) 2002-11-28

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