EP1369075B1 - Geschirrspülmaschine - Google Patents

Geschirrspülmaschine Download PDF

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Publication number
EP1369075B1
EP1369075B1 EP20020425368 EP02425368A EP1369075B1 EP 1369075 B1 EP1369075 B1 EP 1369075B1 EP 20020425368 EP20020425368 EP 20020425368 EP 02425368 A EP02425368 A EP 02425368A EP 1369075 B1 EP1369075 B1 EP 1369075B1
Authority
EP
European Patent Office
Prior art keywords
dishwashing machine
section
delivery duct
electrical resistance
washing
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
EP20020425368
Other languages
English (en)
French (fr)
Other versions
EP1369075A1 (de
Inventor
Silvano Fumagalli
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.)
Candy SpA
Original Assignee
Candy 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 Candy SpA filed Critical Candy SpA
Priority to DE60232438T priority Critical patent/DE60232438D1/de
Priority to ES02425368T priority patent/ES2327614T3/es
Priority to EP20020425368 priority patent/EP1369075B1/de
Publication of EP1369075A1 publication Critical patent/EP1369075A1/de
Application granted granted Critical
Publication of EP1369075B1 publication Critical patent/EP1369075B1/de
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
    • A47L15/42—Details
    • A47L15/4285—Water-heater arrangements

Definitions

  • the present invention relates to a dishwashing machine of the type comprising a washing chamber formed in a machine body, a pump for the washing water, means for spraying the washing water, a delivery duct for establishing fluid communication between the pump and the spraying means, and heating means for heating the water which is sprayed onto the dishes to be washed.
  • These heating means are usually provided in the form of electrical resistances, for example of the type comprising a plated tube, which are mounted by the water supply system, in heat exchange relation with the washing water.
  • This solution is constructionally complex, bulky and difficult to assemble, in addition to increasing the quantity of water drawn from the water mains and conveyed by the pump.
  • the heat exchange between the electrical resistance and the washing water varies depending on the volume of water present in the heating tank as well as on the quantity, speed and pressure with which the water is drawn from and supplied into the tank.
  • the heat exchange between the electrical resistance and washing water is very sensitive to variations in the filling level of the duct as well as the speed and pressure of the water, jeopardising reliable control over the temperature of the water sprayed onto the dishes.
  • the electrical resistance is mounted on the outside of the supply duct, forming for example a heating helix around said duct, which must be formed by metal pipes.
  • the electrical resistance in addition to heating the metal duct, also heats the environment outside the duct. Consequently, in order to avoid damage to the dishwashing machine, it is necessary to protect its sensitive parts or make it using a material which is heat-resistant.
  • EP 1 029 509 A1 and DE 199 08 804 disclose water heating systems and the relative controls in dish washers and in laundry washing machines.
  • the object proposed by the present invention is therefore that of solving the problems mentioned above, by providing a dishwashing machine with characteristics such as to ensure controlled and efficient heating of the washing water, without any risk of overheating.
  • a dishwashing machine according to the invention is indicated in its entirety by the reference number 1.
  • the dishwashing machine 1 comprises a machine body 2, inside which a washing chamber 3 is formed.
  • the washing chamber 3 is delimited by a bottom 4, by a top wall 6 and by side walls 5.
  • the washing chamber 3 and the machine body 2 have a front opening provided with a door, opening of which allows access inside the washing chamber 3 in order to introduce or remove the dishes.
  • the washing chamber 3 houses extractable baskets 7 inside which the dishes are positioned.
  • the washing chamber 3 has, arranged inside it, spraying means, preferably rotating arms 8 provided with a plurality of nozzles 9, through which the washing and rinsing water is delivered.
  • the water delivered by the spraying means is collected by means of gravity inside a storage basin 10 positioned underneath the bottom 4 of the washing chamber 3.
  • the bottom is formed so as to convey the water towards the abovementioned storage basin 10 and is provided with special openings 11 for allowing through-flow of the water.
  • the dishwashing machine 1 comprises a pump 12 which, by means of delivery ducts 13, conveys the pressurised washing or rinsing water to the spraying means 8.
  • the pump 12 may be supplied with water from the water mains or, alternatively, may draw the water from the storage basin 10.
  • the dishwashing machine 1 comprises a delivery duct 13 which establishes fluid communication between the pump 12 and the spraying means, for example the upper rotating arms 8.
  • the delivery duct comprises a section 14 which extends substantially vertically, preferably but not necessarily inside the washing chamber 3 from the bottom 4.
  • said section 14 extends adjacent to one of the side walls 5, preferably the wall opposite the front opening of the washing chamber 3.
  • the dishwashing machine 1 is equipped with at least one electrical heating resistance 15 associated with said section 14 of the delivery duct 13 so as to heat the washing water inside it and comprises thermal regulation means able to regulate the current supply of said electrical resistance 15 depending on the level of filling of the section 14 with washing water.
  • Said thermal regulation means comprise a microswitch 16 which can be actuated by means of a sensor detecting the pressure of the washing waterby a pressure membrane 17, for example arranged in the wall of the delivery duct 13.
  • the dishwashing machine 1 comprises flow regulating means for regulating the water filling level of said section 14.
  • said flow regulating means comprise a slow-return valve 18 able to limit and prevent rapid emptying of the section 14 of the delivery duct 13.
  • the slow-return valve 18 has a resistance such as to delay emptying of the section 14 containing the resistance 15 for the time necessary for cooling of the resistance 15.
  • the heating resistance 15 is housed inside said section 14 of the delivery duct 13, extending substantially along the whole of its length.
  • the section 14 itself is advantageously straight and extends vertically inside the washing chamber 3, occupying preferably the whole height thereof.
  • the electrical resistance 15, which is preferably U-shaped and has a sealing base-piece 19, is inserted inside said section 14 of the delivery duct 13 through a special opening provided along an elbow portion 20 thereof and equipped with suitable seals 21 so that the sealing base-piece 19 seals said opening hermetically, and the ends 22 of the resistance 15 for electrical connection, passing through said sealing base-piece 19, emerge from the delivery duct 13 so as to be connected to the electrical circuit of the dishwashing machine 1.
  • the part of the sealing base-piece 19 which is directed towards the inside of the delivery pipe is shaped so as to form a flow guide for the washing water.
  • a safety conveyor 23 able to collect the lost water due to any permeability between the sealing base-piece 19 and the opening and convey it into a safety basin.
  • the electrical resistance 15 extends substantially centrally inside the straight section 14 which may have a cross section suitably widened to house more easily the resistance 15 itself.
  • the resistance 15 inserted inside the delivery duct 13 preferably does not have any points of direct contact with the walls of the duct 13 and is therefore equipped with at least one spacer 24 made of material having a low coefficient of thermal conductivity, preferably ceramic material, for ensuring positioning thereof inside the delivery duct 13.
  • the pressure membrane 17, being deformed as a result of the water pressure, is intended to actuate the microswitch 16, which in turn regulates the current supply of the heating resistance 15 depending on the filling level of the section 14 containing the resistance 15 and more precisely depending on the degree of immersion of the resistance 15 in the washing water, interrupting for example automatically the supply of current to the resistance 15 when it is not immersed in the washing water.
  • the slow-return or non-return valve 18, which is arranged advantageously in said lower portion 25 of the delivery duct 13 between the pump 12 and the pressure sensor 17, allows the passage of the washing water from the pump 12, but delays and/or prevents the backflow of the water from the section 14 containing the resistance 15 towards the pump, ensuring a filling level of the section 14 such that the resistance 15 is always immersed in the water during the heating phases and during the delayed cooling phases owing to the thermal inertia of the resistance 15.
  • the pump 12 draws the washing water from the water mains or from the storage basin 10 and conveys it, via the delivery duct 13, to the spraying means 8. If the step in the washing or rinsing programme requires heating of the washing water, the resistance 15 inside the section 14 of the delivery duct 13 is supplied with electric current and, heating up, heats the washing water passing through said section 14.
  • the pressure sensor 17 actuates the microswitch 16, which reduces or interrupts the current supply of the resistance 15, thus preventing overheating of said resistance 15 and the walls of the delivery duct 13.
  • the slow-return or non-return valve 18 delays or prevents backflow of the water from the section 14 containing the resistance 15 towards the pump 12, so as to ensure that the electrical resistance 15, which is now deactivated, but still hot owing to its thermal inertia, is immersed in the water for the period during which it cools.
  • door-locking means are provided, said means being able to prevent undesirable opening of the dishwashing machine, for example during the heating phases, in order to avoid any deficiency of water around the resistance.
  • supplying of power to the heating resistance 15 and the pump 12 is controlled by means of a control unit, preferably on the basis of signals supplied by the pressure sensor 17 and any additional thermal sensors, the door-locking means and the washing programme selected.
  • the dimensions of the section 14 as well as those of the resistance 15 can obviously be adapted to the spatial constraints inside the dishwashing machine.
  • the resistance could for example be envisaged also inside a section of a delivery pipe for supplying the bottom spraying means so as to allow varied washing of the load inside the washing chamber 3.
  • the dishwashing machine 1 according to the invention has numerous advantages.
  • Regulation of the current supply of the resistance 15 may be performed both depending on the filling level of the section 14 containing the resistance 15 and depending on the pressure condition of the entire water, and more precisely depending on the filling level (hydrostatic pressure) and the flow speed (hydrodynamic pressure).
  • the flow regulating means, and more precisely the valve means 18 located inside the delivery duct 13, allow adjustment of the degree of immersion of the resistance 15 in the water, as well as the flow of the washing water, in particular during the transition phases of the washing cycle.
  • the dishwashing machine 1 ensures an optimum washing performance and reliable and safe operation, in particular in transition or emergency situations, such as sudden changes in the washing programme, unprogrammemed switching off of the dishwashing machine, opening of the door and deliberate interruption of the washing programme during the recycle phase.
  • the dishwashing machine according to the invention does not increase the quantity of water in use and leaves the flow circuit unchanged, avoiding moreover an excessive dispersion of heat.

Landscapes

  • Washing And Drying Of Tableware (AREA)

Claims (16)

  1. Geschirrspülmaschine (1), enthaltend eine Spülkammer (3), die in einem Maschinenkörper (2) ausgebildet ist, eine Pumpe (2) für das Spülwässer, eine Spritzeinrichtung (8) für das Spülwässer, eine Versorgungsleitung (13), die eine Fluidverbindung zwischen der Pumpe (12) und der Spritzeinrichtung (8) herstellt, und eine Heizeinrichtung, einen elektrischen Widerstand (15), der mit einem Abschnitt der Versorgungsleitung (13) verbunden ist, enthaltend eine Temperaturregeleinrichtung (16, 17), die in der Lage ist, die Stromversorgung des elektrischen Widerstandes (15) in Abhängigkeit des Füllstandes des Abschnittes (14) mit Spülwässer zu regeln,
    dadurch gekennzeichnet, dass die Temperaturregeleinrichtung (16, 17) einen Mikroschalter (16), der die Stromversorgung des elektrischen Widerstandes (15) regelt, und eine Druckmembran (17) enthält, die in Abhängigkeit des Spülwasserdrucks verformt werden kann und so beschaffen ist, dass sie den Mikroschalter (16) durch diese Verformung betätigt.
  2. Geschirrspülmaschine (1) nach Anspruch 1, bei der der Drucksensor eine Druckmembran (17) ist, die in der Wand der Versorgungsleitung (13) angebracht ist.
  3. Geschirrspülmaschine (1) nach einem der vorhergehenden Ansprüche, enthaltend eine Durchflussregeleinrichtung (18), die in der Lage ist, den Füllstand des Abschnittes (14) mit Spülwässer zu regeln.
  4. Geschirrspülmaschine (1) nach Anspruch 3, bei der die Durchflussregeleinrichtung (18) ein Verzögerungs-Rückschlagventil (18) enthält, das in der Lage ist, die Entleerung des Abschnittes (14) der Versorgungsleitung (13) zu verzögern und zu verhindern.
  5. Geschirrspülmaschine (1) nach einem der vorhergehenden Ansprüche, bei der sich der elektrische Widerstand (15) im Abschnitt (14) der Versorgungsleitung (13) befindet.
  6. Geschirrspülmaschine (1) nach Anspruch 5, bei der der Abschnitt (14) der Versorgungsleitung im wesentlichen gerade ist.
  7. Geschirrspülmaschine (1) nach Anspruch 5 oder 6, bei der der Abschnitt (14) der Versorgungsleitung (13) im wesentlichen vertikal in der Spülkammer (3) verläuft.
  8. Geschirrspülmaschine (1) nach einem der Ansprüche 5 bis 7, bei der der elektrische Widerstand (15) zentral im Abschnitt (14) in einem Abstand von der Wand der Versorgungsleitung (13) verläuft.
  9. Geschirrspülmaschine (1) nach einem der Ansprüche 5 bis 8, bei der der elektrische Widerstand (15) mit weinigstens einem Abstandhalter (24) versehen ist, der aus einem Material besteht, das einen niedrigen Temperaturleitkoeffizienten hat, wie etwa einem keramischen Material, um eine Positionierung desselben im Abschnitt (14) sicherzustellen.
  10. Geschirrspülmaschine (1) nach einem der Ansprüche 5 bis 9, bei der der elektrische Widerstand (15) im wesentlichen U-förmig ist, wobei seine Enden (22) für die elektrische Verbindung abgedichtet aus der Versorgungsleitung (13) hervorragen.
  11. Geschirrspülmaschine (1) nach einem der Ansprüche 5 bis 10, bei der sich der Abschnitt (14) der Versorgungsleitung (13) im wesentlichen über die gesamte Höhe der Spülkammer (3) erstreckt und sich der elektrische Widerstand (15) im wesentlichen über die gesamte Höhe des Abschnittes (14) erstreckt.
  12. Geschirrspülmaschine (1) nach einem der Ansprüche 5 bis 11, bei der der Abschnitt (14) der Versorgungsleitung (13) einen geweitete Querschnitt hat.
  13. Geschirrspülmaschine (1) nach einem der Ansprüche 5 bis 12, bei der bei Abhängigkeit von Anspruch 5 das Verzögerungs-Rückschlagventil (18) in der Versorgungsleitung wischen der Pumpe (12) und dem Abschnitt (14) angeordnet ist, der den elektrischen Widerstand (15) enthält.
  14. Geschirrspülmaschine (1) nach Anspruch 12, bei der die Druckmembran (17) in der Versorgungsleitung wischen dem Verzögerungs-Rückschlagventil (18) und dem Abschnitt (14) angeordnet ist, der den elektrischen Widerstand (15) enthält.
  15. Geschirrspülmaschine (1) nach einem der vorhergehenden Ansprüche, weiterhin enthaltend eine Türverriegelungseinrichtung, die in der Lage ist zu verhindern, dass die Geschirrspülmaschine nährend des Spülprogramms geöffnet wird.
  16. Geschirrspülmaschine (1) nach einem der vorhergehenden Ansprüche, bei der der Heizwiderstand (15) in einem Abschnitt (14) des hydraulischen Systems der Geschirrspülmaschine (1) angeordnet ist, der eine variable Versorgung der oberen und der unteren Spritzeinrichtung in der Spülkammer (3) gestattet.
EP20020425368 2002-06-05 2002-06-05 Geschirrspülmaschine Expired - Lifetime EP1369075B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE60232438T DE60232438D1 (de) 2002-06-05 2002-06-05 Geschirrspülmaschine
ES02425368T ES2327614T3 (es) 2002-06-05 2002-06-05 Maquina lavavajillas mejorada.
EP20020425368 EP1369075B1 (de) 2002-06-05 2002-06-05 Geschirrspülmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20020425368 EP1369075B1 (de) 2002-06-05 2002-06-05 Geschirrspülmaschine

Publications (2)

Publication Number Publication Date
EP1369075A1 EP1369075A1 (de) 2003-12-10
EP1369075B1 true EP1369075B1 (de) 2009-05-27

Family

ID=29433247

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020425368 Expired - Lifetime EP1369075B1 (de) 2002-06-05 2002-06-05 Geschirrspülmaschine

Country Status (3)

Country Link
EP (1) EP1369075B1 (de)
DE (1) DE60232438D1 (de)
ES (1) ES2327614T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103281945A (zh) * 2010-12-31 2013-09-04 Lg电子株式会社 洗碗机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012105903A1 (de) * 2012-07-03 2014-01-09 Miele & Cie. Kg Geschirrspülmaschine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9024419D0 (en) * 1990-11-09 1991-01-02 Ist Lab Ltd Heating apparatus
EP0591774B1 (de) * 1992-09-23 1997-08-27 Miele & Cie. GmbH & Co. Geschirrspülmaschine mit einem Durchlauferhitzer
DE19852569A1 (de) * 1998-11-13 2000-05-18 Miele & Cie Umwälzpumpe, insbesondere für wasserführnde Haushaltgeräte
EP1029501B1 (de) * 1999-02-15 2005-01-05 CANDY S.p.A. Geschirrspülmaschine mit einem Heizstrahler
DE19908804C5 (de) * 1999-03-01 2014-05-15 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Betrieb einer Waschmaschine und automatisch gesteuerte Waschmaschine hierfür

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103281945A (zh) * 2010-12-31 2013-09-04 Lg电子株式会社 洗碗机

Also Published As

Publication number Publication date
EP1369075A1 (de) 2003-12-10
ES2327614T3 (es) 2009-11-02
DE60232438D1 (de) 2009-07-09

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