EP0514279B1 - Dishwasher equipped with microfilter - Google Patents

Dishwasher equipped with microfilter Download PDF

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Publication number
EP0514279B1
EP0514279B1 EP19920401335 EP92401335A EP0514279B1 EP 0514279 B1 EP0514279 B1 EP 0514279B1 EP 19920401335 EP19920401335 EP 19920401335 EP 92401335 A EP92401335 A EP 92401335A EP 0514279 B1 EP0514279 B1 EP 0514279B1
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EP
European Patent Office
Prior art keywords
microfilter
liquid
liquid stream
stream
vessel
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EP19920401335
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German (de)
French (fr)
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EP0514279A1 (en
Inventor
Camille Barbier
Emile Delavaud
Benoit Gailledrat
Bernard Leclerc
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Esswein SA
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Esswein SA
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    • 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
    • A47L15/4208—Arrangements to prevent clogging of the filters, e.g. self-cleaning

Definitions

  • the present invention relates to a dishwasher provided with a microfilter.
  • Some dishwashers include, in addition to a medium filter and a coarse filter for filtering medium and large food particles detached from the dishes being washed, a microfilter to remove food microparticles which are suspended in the washing liquid. which often remain in the rinse aid and soil washed or rinsed dishes.
  • a safety valve of the spring type is mounted in the system for supplying this microfilter with liquid to be filtered to allow the liquid to escape.
  • overpressure in the tank of these devices at a point below their medium and large filters.
  • inlets of their pumps for draining and recycling liquid are also inlets of their pumps for draining and recycling liquid. Relatively large food particles in the stream of liquid ejected by the safety valve can thus be sucked up by their recycling pump and sent into their sprinkler reels. These food particles may clog the orifices of these reels and compromise the effectiveness of the washing and / or rinsing dishes.
  • Document EP-A-0 374 009 discloses a method for measuring the degree of soiling of dishes washed in a dishwasher, the result of the measurement influencing the progress of the operating program, but nothing is designed to prevent damage to the microfilter if it becomes dirty.
  • the present invention aimed at avoiding these drawbacks makes it possible to produce an economical dishwasher effective in washing and rinsing dishes, and provided with a microfilter the clogging of which with food particles is not likely to result in complete emptying of the liquid in the tank of the appliance.
  • a dishwasher fitted with medium and large filters and a microfilter supplied with liquid by a system for withdrawing a stream of liquid in the moving liquid in the bottom of the tank, and protected against overpressure of this liquid stream is characterized in that it comprises a safety pipe having a first low end connected to this liquid current sampling system and a second high end opening into the tank above these medium filters and coarse, at a point situated relative to the surface of this microfilter, at a height H, in order to constitute a column of liquid equivalent to a predetermined pressure (Pm) admitted without causing a malfunction of the apparatus, the current of liquid discharged by the dishwasher recycling pump passing through the safety pipe and pouring into the tank when the fouling of the microfilter is such that the pressure of liquid on the surface of the microfilter becomes greater than said predetermined pressure.
  • Pm predetermined pressure
  • an exemplary embodiment is illustrated below, illustrated by an appended drawing which represents a schematic and partial view of a dishwasher fitted with a microfilter.
  • a dishwasher 1 represented diagrammatically by broken lines comprises a tank 2, a lower dish basket 3, an upper dish basket 4, lower 5 and upper 6 reels, and a sump 8 in the bottom of the tank 2.
  • the sump 8 is in communication on the one hand through an intake pipe 9 with a liquid recycling pump 10 which sucks liquid in this sump and discharges it through pipes 12 and 13 in the lower sprinkler reels 5 and above 6, and on the other hand through an inlet 14, with a drain pump 18 which collects liquid in the lowest part of this sump 8 and discharges it outwards through a drain pipe 19.
  • a liquid recycling pump 10 which sucks liquid in this sump and discharges it through pipes 12 and 13 in the lower sprinkler reels 5 and above 6, and on the other hand through an inlet 14, with a drain pump 18 which collects liquid in the lowest part of this sump 8 and discharges it outwards through a drain pipe 19.
  • the sump 8 is covered by a medium filter 20 and a coarse filter 22.
  • the medium filter 20 separates the recycling pump 10, from the tank 2 and from the inlet 14 of the drain pump 18, and puts the tank 2 in communication with the inlet 14 of the drain pump 18, through its tubular opening 21 in which the coarse filter 22 is mounted.
  • a microfilter 25 is mounted in the tank 2 and filters the small food particles or microparticles conveyed by a stream of liquid sent by the recycling pump 10 through a bypass pipe 27. This stream of liquid represents only a fraction liquid discharged by the recycling pump 10.
  • the microfilter 25 allows filtered liquid to pass into the tank 2 and retains food microparticles.
  • the microfilter 25 removes as and when measures the liquid in the tank 2, of all these food microparticles, which makes it possible to obtain, at the end of a washing or rinsing, clean dishes without trace of deposit of food particles.
  • a dishwasher 1 fitted with medium filters 20 and large filters 22 and a microfilter 25 supplied with liquid by a system for withdrawing a stream of liquid in liquid moving in the bottom of the tank and protected against an overpressure of liquid current due to clogging of this microfilter comprises a safety or discharge pipe 28 having a first lower end connected to this system of liquid current sampling and a second upper end 29 opens into the tank 2 above these medium filters 20 and coarse 22, at a point situated relative to the surface of this microfilter 25, at a height H, in order to constitute a column of liquid equivalent to a predetermined pressure Pm allowed without causing a malfunction of the device.
  • the system for withdrawing a stream of liquid supplying the microfilter 25 is constituted by a bypass line 27 connected by one of its ends to a discharge line of the liquid recycling pump and by its other end of this microfilter 25 through a partitioned section 15 of the inlet 14 of the drain pump 18, which communicates on one side with this drain pump 18 by a valve 16 and on the opposite side with the sump 8 by a valve 17, the valves 16 and 17 being non-return type valves.
  • the system for withdrawing a stream of liquid supplying the microfilter consists of a pipe having one end connected to this microfilter and another end placed in communication with an intake pipe of a pump.
  • the microfilter 25 is connected to the drain pump 18 through the valve 16, which aims to create during a drain of the tank 2, a reverse flow of liquid through the microfilter 25 to unclog or rid it of food particles that are retained there.
  • the valves 16 and 17 are in their closed positions during liquid microfiltration and in their open positions during emptying of the tank 2 or unclogging of the microfilter 25.
  • the safety pipe 28 comprises, near its upper end 29, a float 32 which indicates either by direct vision through a transparent wall of the pipe 28 or by a light or sound signal, on the one hand in its low position , an absence of liquid overpressure on the surface of the microfilter 25 or a clean microfilter 25 and on the other hand, in its high position a presence of liquid overpressure on the surface of this microfilter 25 or a fouled microfilter 25.
  • the recycling pump 10 sucks liquid filtered by the medium filter 20 and on the one hand discharges a large part of this liquid through the pipes 12, 13 and the reels watering 5, 6 on the dishes stored in the baskets 3, 4 and on the other hand a fraction of this liquid through the bypass pipe 27 and the microfilter 25 in the tank 2.
  • the food microparticles thus leaves retained by the microfilter 25 and separated as and when the washing or rinsing liquid.
  • the microfilter 25 gradually fouls and hinders the passage of the stream of liquid to be filtered, which causes the liquid pressure to rise on the surface of this microfilter.
  • this pressure of liquid on the surface of the microfilter 25 becomes greater than a predetermined pressure Pm admitted which does not deform or cause a crushing of the food particles present, aggravating the clogging of this microfilter, pressure equivalent to the column of liquid formed in the security pipe 28, the stream of liquid coming from the recycling pump 10 through the bypass line 27 avoids the difficult path of passage through the microfilter 25, takes the easy path of passage through the safety line 28, pours into the tank 2 above the medium and greasy filters 22, which on the one hand makes it possible to spare the microfilter 25 a deformation by a liquid pressure becoming too great and to avoid an untimely emptying of the tank of the apparatus and on the other hand to force the stream of liquid escaping from the safety line 28 to pass through the medium filter 20 which retains the excessively large es food particles before being sucked in again by the recycling pump 10 and thus avoid an untimely obstruction of
  • the draining pump sucks the liquid not only through the medium filters 20 and large 22 but also the microfilter 25.

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  • Filtration Of Liquid (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)

Description

La présente invention concerne un lave-vaisselle muni d'un microfiltre.The present invention relates to a dishwasher provided with a microfilter.

Certains lave-vaisselle comprennent en plus d'un filtre moyen et d'un filtre gros pour un filtrage des moyennes et grosses particules alimentaires détachées de la vaisselle soumise au lavage, un microfiltre pour éliminer des microparticules alimentaires qui sont en suspension dans le liquide de lavage et qui restent souvent présentes encore dans le liquide de rinçage et souillent la vaisselle lavée ou rincée.Some dishwashers include, in addition to a medium filter and a coarse filter for filtering medium and large food particles detached from the dishes being washed, a microfilter to remove food microparticles which are suspended in the washing liquid. which often remain in the rinse aid and soil washed or rinsed dishes.

Ces microparticules alimentaires encrassent rapidement le microfiltre, gênent et/ou empêchent un libre passage du courant de liquide à filtrer et font monter la pression du liquide à la surface de ce microfiltre à une valeur qui peut le déformer, provoquer un écrassement des particules alimentaires présentes aggravant le colmatage du microfiltre et la désintégration de ces particules en microparticules encore plus fines et entraîner une sortie de liquide vers l'extérieur, à travers la pompe de vidange au repos et le tuyau de vidange et un risque de vidage complet du liquide dans la cuve de ces lave-vaiselle. Selon une solution connue pour limiter cette montée de pression de liquide à une valeur limite prédéterminée compatible avec ce microfiltre, un clapet de sécurité du type à ressort est monté dans le système d'alimentation de ce microfiltre en liquide à filtrer pour laisser échapper le liquide en surpression, dans la cuve de ces appareils en un point en dessous de leurs filtres moyen et gros. Or, au niveau de ce point se trouvent également des entrées de leurs pompes de vidange et de recyclage de liquide. Des particules alimentaires relativement grosses dans le courant de liquide éjecté par le clapet de sécurité peuvent être ainsi aspirées par leur pompe de recyclage et envoyées dans leurs moulinets d'arrosage. Ces particules alimentaires risquent d'obstruer les orifices de ces moulinets et de compromettre l'efficacité du lavage et/ou du rinçage de la vaisselle.These food microparticles quickly foul the microfilter, impede and / or prevent a free passage of the stream of liquid to be filtered and cause the pressure of the liquid on the surface of this microfilter to rise to a value which can deform it, causing a clogging of the food particles present. aggravating the clogging of the microfilter and the disintegration of these particles into even finer microparticles and causing an outflow of liquid towards the outside, through the drain pump at rest and the drain hose and a risk of complete emptying of the liquid in the tank of these dishwashers. According to a known solution for limiting this rise in liquid pressure to a predetermined limit value compatible with this microfilter, a safety valve of the spring type is mounted in the system for supplying this microfilter with liquid to be filtered to allow the liquid to escape. overpressure, in the tank of these devices at a point below their medium and large filters. However, at this point are also inlets of their pumps for draining and recycling liquid. Relatively large food particles in the stream of liquid ejected by the safety valve can thus be sucked up by their recycling pump and sent into their sprinkler reels. These food particles may clog the orifices of these reels and compromise the effectiveness of the washing and / or rinsing dishes.

On connaît d'après le document EP-A-0 374 009 un procédé de mesure du degré de salissure de la vaisselle lavée dans un lave-vaisselle, le résultat de la mesure influençant le déroulement du programme de fonctionnement, mais rien n'est prévu pour éviter l'endommagement du microfiltre en cas d'encrassement de celui-ci.Document EP-A-0 374 009 discloses a method for measuring the degree of soiling of dishes washed in a dishwasher, the result of the measurement influencing the progress of the operating program, but nothing is designed to prevent damage to the microfilter if it becomes dirty.

La présente invention visant à éviter ces inconvénients permet de réaliser un lave-vaisselle économique efficace dans le lavage et le rinçage de la vaisselle, et muni d'un microfiltre dont le colmatage par des particules alimentaires ne risque pas d'entraîner un vidage complet du liquide dans la cuve de l'appareil.The present invention aimed at avoiding these drawbacks makes it possible to produce an economical dishwasher effective in washing and rinsing dishes, and provided with a microfilter the clogging of which with food particles is not likely to result in complete emptying of the liquid in the tank of the appliance.

Selon l'invention, un lave-vaisselle muni de filtres moyen et gros et d'un microfiltre alimenté en liquide par un système de prélèvement d'un courant de liquide dans du liquide en mouvement dans le fond de la cuve, et protégé contre une surpression de ce courant de liquide, est caractérisé en ce qu'il comprend une canalisation de sécurité ayant une première extrémité basse reliée à ce système de prélèvement de courant de liquide et une deuxième extrémité haute débouchant dans la cuve au dessus de ces filtres moyen et gros, en un point situé par rapport à la surface de ce microfiltre, à une hauteur H, en vue de constituer une colonne de liquide équivalente à une pression prédéterminée (Pm) admise sans entraîner un mauvais fonctionnement de l'appareil, le courant de liquide refoulé par la pompe de recyclage du lave-vaisselle passant par la canalisation de sécurité et se déversant dans la cuve lorsque l'encrassement du microfiltre est tel que la pression de liquide à la surface du microfiltre devient supérieure à ladite pression prédéterminée.According to the invention, a dishwasher fitted with medium and large filters and a microfilter supplied with liquid by a system for withdrawing a stream of liquid in the moving liquid in the bottom of the tank, and protected against overpressure of this liquid stream, is characterized in that it comprises a safety pipe having a first low end connected to this liquid current sampling system and a second high end opening into the tank above these medium filters and coarse, at a point situated relative to the surface of this microfilter, at a height H, in order to constitute a column of liquid equivalent to a predetermined pressure (Pm) admitted without causing a malfunction of the apparatus, the current of liquid discharged by the dishwasher recycling pump passing through the safety pipe and pouring into the tank when the fouling of the microfilter is such that the pressure of liquid on the surface of the microfilter becomes greater than said predetermined pressure.

Pour mieux faire comprendre l'invention on en décrit ci-après un exemple de réalisation illustré par un dessin ci-annexé qui représente une vue schématique et partielle d'un lave-vaisselle muni d'un microfiltre.To better understand the invention, an exemplary embodiment is illustrated below, illustrated by an appended drawing which represents a schematic and partial view of a dishwasher fitted with a microfilter.

Un lave-vaisselle 1 représenté schématiquement par des traits discontinus comprend une cuve 2, un panier à vaisselle inférieur 3, un panier à vaisselle supérieur 4, des moulinets d'arrosage inférieur 5 et supérieur 6, et un puisard 8 dans le fond de la cuve 2.A dishwasher 1 represented diagrammatically by broken lines comprises a tank 2, a lower dish basket 3, an upper dish basket 4, lower 5 and upper 6 reels, and a sump 8 in the bottom of the tank 2.

Le puisard 8 est en communication d'une part à travers une canalisation d'admission 9 avec une pompe de recyclage de liquide 10 qui aspire du liquide dans ce puisard et le refoule à travers des canalisations 12 et 13 dans les moulinets d'arrosage inférieur 5 et supérieur 6, et d'autre part à travers une entrée 14, avec une pompe de vidange 18 qui recueille du liquide dans la partie la plus basse de ce puisard 8 et le refoule vers l'extérieur à travers un tuyau de vidange 19.The sump 8 is in communication on the one hand through an intake pipe 9 with a liquid recycling pump 10 which sucks liquid in this sump and discharges it through pipes 12 and 13 in the lower sprinkler reels 5 and above 6, and on the other hand through an inlet 14, with a drain pump 18 which collects liquid in the lowest part of this sump 8 and discharges it outwards through a drain pipe 19.

Le puisard 8 est recouvert par un filtre moyen 20 et un filtre gros 22. Le filtre moyen 20 sépare la pompe de recyclage 10, de la cuve 2 et de l'entrée 14 de la pompe de vidange 18, et met la cuve 2 en communication avec l'entrée 14 de la pompe de vidange 18, par son ouverture tubulaire 21 dans laquelle est monté le filtre gros 22.The sump 8 is covered by a medium filter 20 and a coarse filter 22. The medium filter 20 separates the recycling pump 10, from the tank 2 and from the inlet 14 of the drain pump 18, and puts the tank 2 in communication with the inlet 14 of the drain pump 18, through its tubular opening 21 in which the coarse filter 22 is mounted.

Un microfiltre 25 est monté dans la cuve 2 et assure un filtrage des petites particules ou microparticules alimentaires véhiculées par un courant de liquide envoyé par la pompe de recyclage 10 à travers une canalisation de dérivation 27. Ce courant de liquide ne représente qu'une fraction du liquide refoulé par la pompe de recyclage 10. Le microfiltre 25 laisse passer dans la cuve 2 du liquide filtré et retient des microparticules alimentaires, Durant le fonctionnement du lave-vaisselle 1 en lavage ou en rinçage, le microfiltre 25 débarrasse au fur et à mesure le liquide dans la cuve 2, de toutes ces microparticules alimentaires, ce qui permet d'obtenir en fin d'un lavage ou d'un rinçage, une vaisselle propre sans trace de dépôt de particules alimentaires. Un encrassement de ce microfiltre 25 par ces particules alimentaires gêne un libre passage du courant de liquide à filtrer et fait monter au niveau de la surface du microfiltre, la pression du liquide qui peut le déformer, provoquer un écrassement des particules alimentaires présentes aggravant le colmatage du microfiltre et la désintégration des particules alimentaires en microparticules plus fines et vidanger le lave-vaisselle.A microfilter 25 is mounted in the tank 2 and filters the small food particles or microparticles conveyed by a stream of liquid sent by the recycling pump 10 through a bypass pipe 27. This stream of liquid represents only a fraction liquid discharged by the recycling pump 10. The microfilter 25 allows filtered liquid to pass into the tank 2 and retains food microparticles. During the operation of the dishwasher 1 in washing or rinsing, the microfilter 25 removes as and when measures the liquid in the tank 2, of all these food microparticles, which makes it possible to obtain, at the end of a washing or rinsing, clean dishes without trace of deposit of food particles. Clogging of this microfilter 25 by these food particles impedes a free passage of the stream of liquid to be filtered and causes the pressure of the liquid which can deform it to level with the surface of the microfilter, causing a clogging of the food particles present, aggravating the clogging. microfilter and disintegration of food particles into finer microparticles and drain the dishwasher.

Selon l'invention, un lave-vaisselle 1 muni de filtres moyen 20 et gros 22 et d'un microfiltre 25 alimenté en liquide par un système de prélèvement d'un courant de liquide dans du liquide en mouvement dans le fond de la cuve et protégé contre une surpression de courant de liquide due à un colmatage de ce microfiltre comprend une canalisation de sécurité ou de décharge 28 ayant une première extrémité basse reliée à ce système de prélèvement de courant de liquide et une deuxième extrémité haute 29 débouche dans la cuve 2 au-dessus de ces filtres moyen 20 et gros 22, en un point situé par rapport à la surface de ce microfiltre 25, à une hauteur H, en vue de constituer une colonne de liquide équivalente à une pression prédéterminée Pm admise sans entraîner un mauvais fonctionnement de l'appareil.According to the invention, a dishwasher 1 fitted with medium filters 20 and large filters 22 and a microfilter 25 supplied with liquid by a system for withdrawing a stream of liquid in liquid moving in the bottom of the tank and protected against an overpressure of liquid current due to clogging of this microfilter comprises a safety or discharge pipe 28 having a first lower end connected to this system of liquid current sampling and a second upper end 29 opens into the tank 2 above these medium filters 20 and coarse 22, at a point situated relative to the surface of this microfilter 25, at a height H, in order to constitute a column of liquid equivalent to a predetermined pressure Pm allowed without causing a malfunction of the device.

Dans l'exemple illustré, le système de prélèvement d'un courant de liquide alimentant le microfiltre 25 est constitué par une canalisation de dérivation 27 branchée par une de ses extrémités à une conduite de refoulement de la pompe de recyclage de liquide et par son autre extrémité à ce microfiltre 25 à travers un tronçon cloisonné 15 de l'entrée 14 de la pompe de vidange 18, qui communique d'un côté avec cette pompe de vidange 18 par un clapet 16 et du côté opposé avec le puisard 8 par un clapet 17, les clapets 16 et 17 étant des clapets du type anti-retour. Dans une variante de réalisation non représentée, le système de prélèvement d'un courant de liquide alimentant le microfiltre est constitué par une canalisation ayant une extrémité reliée à ce microfiltre et une autre extrémité mise en communication avec une conduite d'admission d'une pompe de vidange à deux sens de rotation, un sens de rotation pour une alimentation du microfiltre en liquide à filtrer et un sens inverse de rotation pour une vidange de la cuve et un nettoyage ou décolmatage du microfiltre. Il en résulte que, quand le microfiltre 25 est encrassé et la pression de liquide sur la surface de ce microfiltre devient supérieure à Pm, le courant de liquide à filtrer venant de la pompe de recyclage 10 par la canalisation 27, emprunte la canalisation de sécurité 28 et se déverse dans la cuve 2, au-dessus des filtres moyen 20 et gros 22, à travers son extrémité haute 29. Les particules alimentaires contenues dans le courant de liquide éjecté de la canalisation de sécurité 28 sont alors retenues par le filtre moyen 20 et n'atteignent pas la pompe de recyclage 10 qui alimente les moulinets d'arrosage 5 et 6. Un risque d'obstruction des orifices de ces moulinets d'arrosage 5 et 6 est ainsi pratiquement inexistant.In the example illustrated, the system for withdrawing a stream of liquid supplying the microfilter 25 is constituted by a bypass line 27 connected by one of its ends to a discharge line of the liquid recycling pump and by its other end of this microfilter 25 through a partitioned section 15 of the inlet 14 of the drain pump 18, which communicates on one side with this drain pump 18 by a valve 16 and on the opposite side with the sump 8 by a valve 17, the valves 16 and 17 being non-return type valves. In an alternative embodiment not shown, the system for withdrawing a stream of liquid supplying the microfilter consists of a pipe having one end connected to this microfilter and another end placed in communication with an intake pipe of a pump. emptying system with two directions of rotation, one direction of rotation for supplying the microfilter with liquid to be filtered and an opposite direction of rotation for emptying the tank and cleaning or unclogging the microfilter. As a result, when the microfilter 25 is dirty and the liquid pressure on the surface of this microfilter becomes greater than Pm, the stream of liquid to be filtered coming from the recycling pump 10 through the line 27, borrows the safety line 28 and pours into the tank 2, above the medium filters 20 and large 22, through its upper end 29. The food particles contained in the stream of liquid ejected from the safety line 28 are then retained by the medium filter 20 and do not reach the recycling pump 10 which feeds the sprinklers 5 and 6. A risk of obstruction of the orifices of these sprinklers 5 and 6 is thus practically non-existent.

Dans l'exemple illustré, le microfiltre 25 est relié à la pompe de vidange 18 à travers le clapet 16, ce qui a pour but de créer lors d'une vidange de la cuve 2, un courant inverse de liquide à travers le microfiltre 25 pour le décolmater ou le débarrasser des particules alimentaires qui y sont retenues. Les clapets 16 et 17 sont dans leurs positions de fermeture durant le microfiltrage de liquide et dans leurs positions d'ouverture durant une vidange de la cuve 2 ou le décolmatage du microfiltre 25. Dans un début de fonctionnement, la pompe de vidange 18 étant au repos, sous l'effet de la pression du courant liquide envoyé par la pompe de recyclage 10 vers le microfiltre 25, le clapet 17 est fermé et le clapet 16 est ouvert et l'ouverture du clapet 16 prend fin quand la colonne de liquide formée dans le tuyau de vidange 19 est équivalente à la colonne de liquide formée dans la canalisation de sécurité 28, c'est-à-dire la pression du courant de liquide au niveau du microfiltre 25.In the example illustrated, the microfilter 25 is connected to the drain pump 18 through the valve 16, which aims to create during a drain of the tank 2, a reverse flow of liquid through the microfilter 25 to unclog or rid it of food particles that are retained there. The valves 16 and 17 are in their closed positions during liquid microfiltration and in their open positions during emptying of the tank 2 or unclogging of the microfilter 25. In a start of operation, the drain pump 18 being at rest, under the effect of the pressure of the liquid current sent by the recycling pump 10 to the microfilter 25, the valve 17 is closed and the valve 16 is open and the opening of the valve 16 ends when the column of liquid formed in the drain pipe 19 is equivalent to the column of liquid formed in the safety line 28, that is to say the pressure of the stream of liquid at the level of the microfilter 25.

La canalisation de sécurité 28 comprend dans la proximité de son extrémité haute 29, un flotteur 32 qui indique soit par une vision directe à travers une paroi transparente de la canalisation 28 soit par un signal lumineux ou sonore, d'une part dans sa position basse, une absence de surpression de liquide à la surface du microfiltre 25 ou un microfiltre 25 propre et d'autre part, dans sa position haute une présence d'une surpression de liquide à la surface de ce microfiltre 25 ou un microfiltre 25 encrassé.The safety pipe 28 comprises, near its upper end 29, a float 32 which indicates either by direct vision through a transparent wall of the pipe 28 or by a light or sound signal, on the one hand in its low position , an absence of liquid overpressure on the surface of the microfilter 25 or a clean microfilter 25 and on the other hand, in its high position a presence of liquid overpressure on the surface of this microfilter 25 or a fouled microfilter 25.

Durant un fonctionnement du lave-vaisselle 1 en lavage ou en rinçage, la pompe de recyclage 10 aspire du liquide filtré par le filtre moyen 20 et refoule d'une part une grande partie de ce liquide à travers les canalisations 12, 13 et les moulinets d'arrosage 5, 6 sur la vaisselle entreposée dans les paniers 3, 4 et d'autre part une fraction de ce liquide à travers la canalisation de dérivation 27 et le microfiltre 25 dans la cuve 2. Les microparticules alimentaires sort ainsi retenues par le microfiltre 25 et séparées au fur et à mesure du liquide de lavage ou de rinçage.During operation of the dishwasher 1 in washing or in rinsing, the recycling pump 10 sucks liquid filtered by the medium filter 20 and on the one hand discharges a large part of this liquid through the pipes 12, 13 and the reels watering 5, 6 on the dishes stored in the baskets 3, 4 and on the other hand a fraction of this liquid through the bypass pipe 27 and the microfilter 25 in the tank 2. The food microparticles thus leaves retained by the microfilter 25 and separated as and when the washing or rinsing liquid.

Le microfiltre 25 s'encrasse progressivement et gêne le passage du courant de liquide à filtrer, ce qui fait monter la pression de liquide à la surface de ce microfiltre. Quand cette pression de liquide à la surface du microfiltre 25 devient supérieure à une pression prédéterminée Pm admise qui ne déforme ni provoque un écrassement des particules alimentaires présentes aggravant le colmatage de ce microfiltre, pression équivalente à la colonne de liquide formée dans la canalisation de sécurité 28, le courant de liquide venant de la pompe de recyclage 10 par la canalisation de dérivation 27 évite la voie difficile de passage à travers le microfiltre 25, emprunte la voie facile de passage à travers la canalisation de sécurité 28, se déverse dans la cuve 2 au-dessus des filtres moyen 20 et gras 22, ce qui permet d'une part d'épargner au microfiltre 25 une déformation par une pression de liquide devenant trop importante et d'éviter une vidange intempestive de la cuve de l'appareil et d'autre part d'obliger le courant de liquide échappé de la canalisation de sécurité 28 à repasser par le filtre moyen 20 qui retient les trop grosses particules alimentaires avant d'être aspiré de nouveau par la pompe de recyclage 10 et d'éviter ainsi une obstruction inopportune des orifices des moulinets d'arrosage 5, 6 par ces trop grosses particules alimentaires et un mauvais résultat de lavage ou rinçage de la vaisselle. Le flotteur 32 poussé par le courant de liquide venant de la pompe de recyclage 10, occupe sa position haute et signale le colmatage du microfiltre 25. Lors d'une vidange de la cuve 2, la pompe de vidange aspire le liquide à travers non seulement les filtres moyen 20 et gros 22 mais également le microfiltre 25. Le courant de liquide aspiré à travers le microfiltre 25 par la pompe de vidange 18 dans un sens inverse de celui du courant de liquide à filtrer traversant ce microfiltre 25, vidange les particules alimentaires retenues dans le microfiltre 25 et le nettoie efficacement.The microfilter 25 gradually fouls and hinders the passage of the stream of liquid to be filtered, which causes the liquid pressure to rise on the surface of this microfilter. When this pressure of liquid on the surface of the microfilter 25 becomes greater than a predetermined pressure Pm admitted which does not deform or cause a crushing of the food particles present, aggravating the clogging of this microfilter, pressure equivalent to the column of liquid formed in the security pipe 28, the stream of liquid coming from the recycling pump 10 through the bypass line 27 avoids the difficult path of passage through the microfilter 25, takes the easy path of passage through the safety line 28, pours into the tank 2 above the medium and greasy filters 22, which on the one hand makes it possible to spare the microfilter 25 a deformation by a liquid pressure becoming too great and to avoid an untimely emptying of the tank of the apparatus and on the other hand to force the stream of liquid escaping from the safety line 28 to pass through the medium filter 20 which retains the excessively large es food particles before being sucked in again by the recycling pump 10 and thus avoid an untimely obstruction of the orifices of the sprinkler reels 5, 6 by these too large food particles and a poor washing or rinsing result of the dishes. The float 32 pushed by the current of liquid coming from the recycling pump 10, occupies its high position and signals the clogging of the microfilter 25. During a draining of the tank 2, the draining pump sucks the liquid not only through the medium filters 20 and large 22 but also the microfilter 25. The stream of liquid sucked through the microfilter 25 by the drain pump 18 in a direction opposite to that of the stream of liquid to be filtered passing through this microfilter 25, empties the food particles retained in the microfilter 25 and cleans it effectively.

Claims (6)

  1. Dishwasher equipped with medium (20) and coarse (22) filters and with a microfilter (25) supplied with liquid via a system for taking off a liquid stream from the liquid moving in the bottom of the vessel, and protected from an overpressure of this liquid stream, characterized in that it comprises a safety line (28) having a first, bottom end connected to this liquid-stream take-off system and a second, top end (29) emerging into the vessel (2) above these medium (20) and coarse (22) filters, at a point located with respect to the surface of this microfilter (25) at a height (H), for the purpose of constituting a liquid column equivalent to a predetermined pressure (Pm) allowed without resulting in incorrect operation of the apparatus, the liquid stream delivered by the recirculating pump (10) of the dishwasher passing via the safety line (28) and discharging into the vessel when the fouling of the microfilter (25) is such that the liquid pressure at the surface of the microfilter becomes higher than the said predetermined pressure.
  2. Dishwasher according to Claim 1, characterized in that the system for taking off a liquid stream supplying the microfilter (25) is constituted by a branch line (27) connected up via one of its ends to a delivery pipe from the liquid recirculating pump (10) and via its other end to this microfilter (25) through a partitioned section (15) of the inlet (14) of the draining pump (18).
  3. Dishwasher according to Claim 1, characterized in that the system for taking off a liquid stream supplying the microfilter is constituted by a line having a first end connected to the microfilter and a second end brought into communication with an inlet pipe of a draining pump having two rotation directions, one rotation direction for supplying the microfilter with liquid to be filtered and a reverse rotation direction for draining the vessel and for cleaning or unclogging this microfilter.
  4. Dishwasher according to Claim 2, characterized in that, in the system for taking off a liquid stream supplying the microfilter (25), the partitioned section (15) of the inlet (14) of the draining pump (18) is closed at the two ends by two valves (16, 17) of the non-return type which are in their closed positions during filtering of liquid by the microfilter (25) and in their open positions during draining of the vessel (2).
  5. Dishwasher according to Claim 4, characterized in that, in the valves (16, 17) partitioning the common section (15) of the inlet (14) of the draining pump (18), the valve (16) which brings the microfilter (25) into communication with this draining pump (18) is opened under the effect of the pressure of the liquid stream supplying the microfilter (25), at a start of operation until a liquid column formed in a drain pipe (19) is equivalent to a liquid column formed in the safety line (28), that is to say the pressure of this liquid stream at this microfilter (25).
  6. Dishwasher according to Claim 1, characterized in that the safety line (28) comprises, in the vicinity of its top end (29), a float (32) which indicates presence or absence of a liquid overpressure at the surface of the microfilter (25).
EP19920401335 1991-05-17 1992-05-15 Dishwasher equipped with microfilter Expired - Lifetime EP0514279B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9106013A FR2676348B1 (en) 1991-05-17 1991-05-17 DISHWASHER PROVIDED WITH A MICROFILTER.
FR9106013 1991-05-17

Publications (2)

Publication Number Publication Date
EP0514279A1 EP0514279A1 (en) 1992-11-19
EP0514279B1 true EP0514279B1 (en) 1995-02-15

Family

ID=9412890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920401335 Expired - Lifetime EP0514279B1 (en) 1991-05-17 1992-05-15 Dishwasher equipped with microfilter

Country Status (4)

Country Link
EP (1) EP0514279B1 (en)
DE (1) DE69201402T2 (en)
ES (1) ES2068683T3 (en)
FR (1) FR2676348B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4400877C2 (en) * 1994-01-14 1997-07-31 Aeg Hausgeraete Gmbh Process for the detection of soiled sieves in household dishwashers

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT292251B (en) * 1968-05-15 1971-08-25 Zanussi A Spa Industrie Washing machine, in particular dish washing machine
FR2499396A1 (en) * 1981-02-06 1982-08-13 Esswein Sa Dishwashing machine with pump pressure transducer - uses pump to spray water onto dishes and pressure transducer to cut off water inlet solenoid when sufficient water is admitted
FR2558366B1 (en) * 1984-01-20 1987-04-10 Esswein Sa LIQUID MICROFILTRING DISHWASHER
FR2640489B1 (en) * 1988-12-16 1994-06-03 Esswein Sa DISHWASHING PROCESS AND DISHWASHER IMPLEMENTING THE SAME

Also Published As

Publication number Publication date
DE69201402T2 (en) 1995-08-10
FR2676348B1 (en) 1993-07-23
EP0514279A1 (en) 1992-11-19
FR2676348A1 (en) 1992-11-20
DE69201402D1 (en) 1995-03-23
ES2068683T3 (en) 1995-04-16

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