EP1029501B1 - Machine à laver la vaisselle à chauffage radiant - Google Patents

Machine à laver la vaisselle à chauffage radiant Download PDF

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Publication number
EP1029501B1
EP1029501B1 EP19990830076 EP99830076A EP1029501B1 EP 1029501 B1 EP1029501 B1 EP 1029501B1 EP 19990830076 EP19990830076 EP 19990830076 EP 99830076 A EP99830076 A EP 99830076A EP 1029501 B1 EP1029501 B1 EP 1029501B1
Authority
EP
European Patent Office
Prior art keywords
dishwasher according
delivery duct
washing chamber
chamber
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
EP19990830076
Other languages
German (de)
English (en)
Other versions
EP1029501A1 (fr
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 EP19990830076 priority Critical patent/EP1029501B1/fr
Priority to DE69923055T priority patent/DE69923055T2/de
Publication of EP1029501A1 publication Critical patent/EP1029501A1/fr
Application granted granted Critical
Publication of EP1029501B1 publication Critical patent/EP1029501B1/fr
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 dishwasher comprising a washing chamber formed in a machine body, a pump for the washing water, means for spraying the washing water, a delivery pipe for putting the pump into fluid communication with the spray means, and heating means disposed inside the washing chamber.
  • dishwashers have heating means which are switched on both during washing, in order to heat the washing water, and during the subsequent crockery-drying stage.
  • the requirement to be satisfied is for a capability to heat the water during the washing stage and, in particular, to heat the air during the subsequent drying stage.
  • there is a much-felt need to perform the drying stage whilst avoiding, as far as possible, the need to use motor-driven suction or pressure fans which lead to an increase in the cost of the dishwasher as well as increasing its structural complexity.
  • the aforesaid heating means are constituted, in most cases, by shielded electrical resistors which are disposed in a serpentine arrangement inside the washing chamber and, more precisely, in its base. It is appropriate to point out that, in order to supply the required amount of heat during washing and during the subsequent crockery-drying stage, it is necessary to use electrical resistors of considerable length. The resistors therefore extend over the greater part of the surface of the washing-chamber base.
  • the considerable extent of the heating element inside the washing chamber has a barrier effect on the flow of washing water towards the underlying collection tray, creating imbalances in the recycling of the washing water under pressure.
  • the location of the heating elements close to the base of the tank is dangerous because of the burns which they may cause even to a proficient and careful user of the dishwasher. This is due to the residual temperature of the heating elements which remains high for a prolonged period of time after the completion of the operating cycle of the machine.
  • the problem upon which the present invention is based is that of devising a dishwasher which has structural and functional characteristics such as to satisfy the aforementioned requirements and, at the same time, to prevent the problems referred to with reference to the dishwashers of the prior art.
  • a dishwasher according to the invention is generally indicated 1.
  • the dishwasher 1 comprises a machine body 2 inside which there is a washing chamber 3.
  • the washing chamber 3 is defined by a base 4, by an upper wall 6, and by side walls 5.
  • the washing chamber 3 and the body 2 of the dishwasher 1 have a front opening 7 in which there is a door 8, the opening of which affords access to the interior of the washing chamber 3 for the insertion or removal of the crockery.
  • the washing chamber houses removable baskets (not shown in the drawing) in which the crockery is placed.
  • the dishwasher 1 comprises means, disposed inside the washing chamber, for spraying washing water.
  • the dishwasher 1 has upper spray means 9 disposed in the upper portion of the washing chamber 3, that is, close to the upper wall 6.
  • the upper spray means 9 are constituted by rotary arms 10 having a plurality of nozzles through which the washing and rinsing water is supplied.
  • the washing water supplied by the spray means is collected by gravity in a collection tray 11 located beneath the base 4 of the washing chamber 3.
  • the base 4 is shaped so as to direct the water towards the collection tray 11 and has suitable holes through which the water can pass.
  • the dishwasher 1 comprises a pump 12 which sends the washing or rinsing water, under pressure, through delivery ducts, to the spray means.
  • the pump 12 may be supplied with water from the water mains or, alternatively, may draw water from the collection tank 11.
  • the dishwasher 1 comprises a delivery duct 14 which puts the pump 12 into fluid communication with the upper spray means 9.
  • the delivery duct 14 comprises a portion 15 which extends vertically from the base 4, inside the washing chamber 3.
  • the portion 15 of the delivery duct 14 extends close to a wall 5 of the washing chamber 3, more precisely, to the wall opposite the front opening 7.
  • the dishwasher 1 has heating means 16 which are located inside the washing chamber 3 and are associated with the portion 15 of the delivery duct 14 so as to heat it. As a result, the heating means 16 therefore extend close to the wall 5 of the washing chamber 3 opposite the front opening 7.
  • the heating means comprise an outer casing 18 defining, around the aforesaid portion 15 of the delivery duct 14, a chamber in which the heating elements 19 extend.
  • This chamber defined by the outer casing 18 houses a thermally-conductive material, for example aluminium, which promotes the transmission of heat from the heating elements 19 to the portion 15 of the delivery duct 14 and to the outer casing 18.
  • a thermally-conductive material for example aluminium
  • the above-mentioned chamber is preferably filled with a thermally-conductive material.
  • the chamber is filled with an aluminium casting 20 in which the heating elements 19 and the portion 15 of the delivery duct 14 are embedded.
  • the chamber may be filled with thermally-conductive material, for example, in the form of small balls.
  • the outer casing 18 is preferably made of a thermally-conductive material, for example, a metal.
  • this casing may advantageously be made of stainless steel.
  • the two opposite head ends of the chamber defined by the outer casing 18 are closed by respective end elements 21.
  • the heating elements 19 comprise shielded electrical resistors having tubular cross-sections and shaped so as to have a serpentine arrangement.
  • the ends of the electrical resistors advantageously project from the base 4 of the washing chamber 3 so that they can easily be supplied.
  • the electrical resistors used have a power of 15-20 W/cm 2 and their length, that is, the length of the serpentine arrangement, is determined in dependence on the thermal power required during the washing and drying stages.
  • the outer casing 18 advantageously extends parallel to the aforementioned wall 5 of the washing chamber 3 so as to have a substantially flattened shape which reduces to the minimum the space which it occupies inside the washing chamber 3.
  • the aforementioned flattened shape of the heating means prevents the above-mentioned problem of the barrier effects on the flow of washing water directed towards the collection tray mentioned with reference to dishwashers of the prior art.
  • the outer surface of the casing 18 is advantageously smooth so as to promote running of the water drops thereon.
  • the water sprayed by the spray means forms a constant thin layer of water on the outer surface of the casing 18.
  • the formation of this thin layer of water achieves the dual advantage of speeding up the recovery of the water in the underlying collection tray 11 and of further heating the washing water.
  • the outer casing 18 may be made of various materials, the use of epoxy resins, for example, being advantageous for some uses.
  • the delivery duct 14 is generally made of plastics material, since it suffices for only its portion 15 which is embedded in the aluminium casting 20 to be made of metal or other thermally-conductive material.
  • the aforesaid portion 15 is preferably made of an corrosion-resistant material such as stainless steel.
  • the unit comprising the outer casing 18, the end elements 21, the heating elements 19, and the aluminium casting 20 forms an instantaneous radiant heater 16 which can heat the water contained in the portion 15 of the delivery duct 14.
  • the radiant heater 16 also enables all of the heat produced by the heating elements 19 to be released into the washing chamber 3.
  • the radiant heater 16 can consequently advantageously be used for generating all of the heat required during the crockery-drying stage.
  • the location of the heating element close to the wall 5 of the washing chamber 3 opposite the front opening 7 is particularly advantageous. In fact, in prevents a user of the dishwasher 1 from having any contact with the element during the normal operations to insert crockery in the removable baskets of the washing chamber 3 or to remove crockery therefrom, avoiding the danger of burns.
  • the location of the heating elements inside the aluminium casting 20 prevents malodorous deposits from forming thereon and avoids exposure of the heating elements to surface attack by calcareous solutions which, over time, give rise to surface encrustation of the resistors. It need hardly be pointed out that such encrustations reduce the thermal efficiency of the resistors and cause known phenomena of local overheating of the heating element which compromises its useful life.
  • Figure 4 shows a variant of the radiant heater 16.
  • the radiant heater has no outer casing 18, the casting 22 of thermally-conductive material being exposed directly to the atmosphere of the washing chamber 3.
  • the heating elements 19 and the portion 15 of the delivery duct 14 are embedded in a protected position inside the casting 22 of thermally-conductive material.
  • Figures 5 and 6 show a different variant of the radiant heater of the dishwasher 1.
  • This embodiment is simpler and less expensive than the previous embodiments, being particularly suitable for the production of more economical dishwashers or those in which there is no provision for the additional stage for drying the crockery by means of resistors supplied dry.
  • the outer casing of the radiant heater is constituted directly by a portion 23 of the delivery duct 14 which extends vertically from the base 4, inside the washing chamber 3.
  • the portion 23 has a larger surface area than the rest of the delivery duct 14 and is shaped so as to have a substantially flattened shape.
  • the heating elements 19 extend inside the above-mentioned portion 23 of the delivery duct 14 so as to be in direct contact with the washing water.
  • the dishwasher according to the invention satisfies the above-mentioned requirements and prevents the problems referred to with reference to the dishwashers of the prior art.

Claims (17)

  1. Lave-vaisselle comprenant une chambre de lavage (3) formée dans un corps de machine (2), une pompe (12) pour l'eau de lavage, des moyens de pulvérisation (9, 10) pour pulvériser l'eau de lavage, un conduit distributeur (14) pour mettre la pompe (12) en communication de fluide avec lesdits moyens de pulvérisation (9, 10), et des moyens de chauffage (18, 19, 20, 21), associés à une portion (15) du conduit distributeur (14) afin de la chauffer, caractérisé en ce que lesdits moyens de chauffage et au moins ladite portion (15) du conduit distributeur (14) sont disposés à l'intérieur de la chambre de lavage (3).
  2. Lave-vaisselle selon la revendication 1, dans lequel les moyens de chauffage comprennent un boítier externe (18) définissant une chambre autour de ladite portion (15) du conduit distributeur (14), des éléments de chauffage (19) étant ajustés dans la chambre.
  3. Lave-vaisselle selon la revendication 2, dans lequel la chambre renferme un matériau thermoconducteur pour favoriser la transmission de chaleur des éléments de chauffage (19) à ladite portion (15) du conduit distributeur (14) associée à ceux-ci et au boítier externe (18) .
  4. Lave-vaisselle selon la revendication 3, dans lequel la chambre est remplie par une pièce coulée (20) de matériau thermoconducteur, les éléments de chauffage (19) et ladite portion (15) du conduit distributeur (14) étant enrobés dans la pièce coulée (20).
  5. Lave-vaisselle selon la revendication 3 ou la revendication 4, dans lequel le matériau thermoconducteur est de l'aluminium.
  6. Lave-vaisselle selon la revendication 2, dans lequel le boítier externe (18) est fait de métal.
  7. Lave-vaisselle selon la revendication 6, dans lequel le boítier externe (18) est fait d'acier inoxydable.
  8. Lave-vaisselle selon la revendication 2, dans lequel le boítier externe (18) est fait de résine époxy.
  9. Lave-vaisselle selon la revendication 1, dans lequel les moyens de chauffage comprennent des éléments de chauffage disposés près de ladite portion (15) du conduit distributeur (14), les éléments de chauffage (18) et ladite portion (15) du conduit distributeur (14) étant enrobés dans une pièce coulée (20) de matériau thermoconducteur.
  10. Lave-vaisselle selon la revendication 1, dans lequel les moyens de chauffage comprennent des éléments de chauffage (19) s'étendant à l'intérieur de ladite portion (15) du conduit distributeur (14), qui est positionnée à l'intérieur de la chambre de lavage (3).
  11. Lave-vaisselle selon la revendication 2, la revendication 9 ou la revendication 10, dans lequel ladite portion (15) du conduit distributeur (14) est faite de métal.
  12. Lave-vaisselle selon la revendication 2, la revendication 9 ou la revendication 10, dans lequel les éléments de chauffage (19) comprennent au moins une résistance électrique s'étendant en un agencement en serpentin.
  13. Lave-vaisselle selon la revendication 12, dans lequel les extrémités de ladite au moins une résistance électrique en serpentin font saillie depuis la base (4) de la chambre de lavage (3).
  14. Lave-vaisselle selon la revendication 1, dans lequel les moyens de chauffage ont une forme sensiblement aplatie.
  15. Lave-vaisselle selon la revendication 1, dans lequel les moyens de chauffage sont positionnés près d'une paroi (5) de la chambre de lavage (3).
  16. Lave-vaisselle selon la revendication 15, dans lequel la chambre de lavage (3) comprend une ouverture avant (7) et les moyens de chauffage sont positionnés près de la paroi de la chambre de lavage (3) à l'opposé de l'ouverture avant (7).
  17. Lave-vaisselle selon la revendication 1, dans lequel les moyens (9, 10) pour pulvériser l'eau de lavage sont situés dans la partie supérieure de la chambre de lavage (3), et dans lequel le conduit distributeur (14) s'étend verticalement depuis la base (4) de la chambre de lavage (3), près d'une paroi (5) de celle-ci.
EP19990830076 1999-02-15 1999-02-15 Machine à laver la vaisselle à chauffage radiant Expired - Lifetime EP1029501B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19990830076 EP1029501B1 (fr) 1999-02-15 1999-02-15 Machine à laver la vaisselle à chauffage radiant
DE69923055T DE69923055T2 (de) 1999-02-15 1999-02-15 Geschirrspülmaschine mit einem Heizstrahler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19990830076 EP1029501B1 (fr) 1999-02-15 1999-02-15 Machine à laver la vaisselle à chauffage radiant

Publications (2)

Publication Number Publication Date
EP1029501A1 EP1029501A1 (fr) 2000-08-23
EP1029501B1 true EP1029501B1 (fr) 2005-01-05

Family

ID=8243276

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19990830076 Expired - Lifetime EP1029501B1 (fr) 1999-02-15 1999-02-15 Machine à laver la vaisselle à chauffage radiant

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EP (1) EP1029501B1 (fr)
DE (1) DE69923055T2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20120184U1 (de) * 2001-12-13 2002-06-13 Kulbach Egon Energie-Spar-Spülmaschine II
DE60232438D1 (de) * 2002-06-05 2009-07-09 Candy Spa Geschirrspülmaschine
CN107361714B (zh) * 2017-09-20 2023-05-26 佛山市顺德区美的洗涤电器制造有限公司 底座组件及洗碗机

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1226248B (de) * 1963-03-25 1966-10-06 Miele & Cie Maschinenfabrik Desinfektion von Geschirr od. dgl. in Geschirrspuelmaschinen fuer Krankenhaeuser od. dgl.
DE3138293A1 (de) * 1981-09-25 1983-07-14 Elpag AG Chur, 7001 Chur Durchlauferhitzer
JPH0686751A (ja) * 1992-09-09 1994-03-29 Matsushita Electric Ind Co Ltd 食器洗い乾燥機
DE59307198D1 (de) * 1992-09-23 1997-10-02 Miele & Cie Geschirrspülmaschine mit einem Durchlauferhitzer
IT238849Y1 (it) * 1995-05-26 2000-11-15 Zanussi Elettrodomestici Lavastoviglie con mezzi elettrici di riscaldamento

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Publication number Publication date
DE69923055D1 (de) 2005-02-10
DE69923055T2 (de) 2005-06-16
EP1029501A1 (fr) 2000-08-23

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