EP0514285A1 - Dishwasher with practically non-blockable microfilter - Google Patents

Dishwasher with practically non-blockable microfilter Download PDF

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Publication number
EP0514285A1
EP0514285A1 EP92401352A EP92401352A EP0514285A1 EP 0514285 A1 EP0514285 A1 EP 0514285A1 EP 92401352 A EP92401352 A EP 92401352A EP 92401352 A EP92401352 A EP 92401352A EP 0514285 A1 EP0514285 A1 EP 0514285A1
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EP
European Patent Office
Prior art keywords
microfilter
liquid
filtered
meshes
food particles
Prior art date
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Granted
Application number
EP92401352A
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German (de)
French (fr)
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EP0514285B1 (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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Publication of EP0514285A1 publication Critical patent/EP0514285A1/en
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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 microfilter dishwasher that is practically non-pluggable.
  • a flow of liquid to be filtered is usually created by bypassing the device's liquid circuit, and a microfilter is used in this liquid current to retain food microparticles, preventing them from re-entering the circuit liquid from the appliance and soil the dishes when washing or rinsing. As they accumulate, these microparticles block the mesh of the microfilter, and prevent passage of the current of liquid to be filtered.
  • the microfilter Periodically the microfilter is cleaned by a voluntary sending of a reverse current of liquid through its meshes to unclog these and drain the food particles retained by this microfilter.
  • the present invention aims to avoid these drawbacks, makes it possible to produce a dishwasher having a microfilter which is practically not clogged with food particles and thus does not require any manual cleaning, while helping to give the washed or rinsed dishes excellent cleanliness without trace of deposit of food microparticles.
  • a dishwasher is characterized in that it comprises means of annihilation and of slowing down the progression of these food particles at the entry and in the meshes of this 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 inlet 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.
  • a microfilter 40 illustrated in FIG. 1 is mounted in the tank 2 and filters small particles or food microparticles conveyed by a stream of liquid sent by the recycling pump 10 through a bypass pipe 27 and a partitioned section 15 of the inlet 14 of the drain pump 18.
  • This liquid stream represents only a fraction of the liquid discharged by the recycling pump 10.
  • the microfilter 40 lets filtered liquid through the tank 2 and retains food microparticles.
  • Two non-return type valves 16, 17 are mounted in the inlet 14 of the drain pump 18 to delimit the partitioned section 15.
  • the valve 16 separates the section 15 and the inlet opening of the drain pump 18 while the valve 17 separates the sump 8 and the section 15.
  • the valves 16 and 17 being normally in their closed position are capable of being opened only in the direction of the drain pump 18 but completely blocked in closing in the opposite direction.
  • the microfilter 40 gradually rids the liquid in the tank 2, of all these food microparticles, which makes it possible to obtain at the end of a washing or d '' rinse, clean dishes without traces of food particles. Clogging of this microfilter 40 by these food particles obstructs and gradually prevents a free passage of the stream of liquid to be filtered and simultaneously increases the level of the liquid pressure at the surface of the microfilter, which worsens the clogging of this microfilter and can deform it. .
  • the clogging of the microfilter 40 is a function both of the pressure of the stream of liquid to be filtered and of the time left for the food particles to penetrate and progress through the meshes of this microfilter.
  • the greater the pressure of the stream of liquid to be filtered the more the penetration and advancement of these food particles in the meshes of the microfilter 40 are deep and the more the clogging of this microfilter is solid or for a given pressure of this stream of liquid to be filtered, the greater the time left for the penetration and progression of these food particles the greater the advancement of these food particles in the meshes of the microfilter 40 and the more the clogging is confirmed.
  • this microfilter is usually removable and placed in an easily accessible location.
  • the means of annihilation and slowing down of the progression of the food particles transported by the stream of liquid to be filtered, at the inlet and in the meshes of the microfilter 40 are a combination of the first means operating by repelling, against the penetration and the progression of these food particles in the meshes of this microfilter and of the second means of exposure for a predetermined minimum time to, to these first means, during washing or rinsing, mesh by mesh or group of meshs by group of meshs of the "exit" face of this microfilter.
  • the "inlet” side and the "outlet” side of the microfilter are defined with respect to the flow of liquid passing through this microfilter. The "inlet” side is where the flow of liquid enters and the "outlet” side is where the stream comes out.
  • the first means operating by pushing against the penetration and the progression of food particles in the meshes of the microfilter 40 consist of one or more liquid jets 45, 46 projected by the sprinkler 5 on the face " outlet "of this microfilter 40 in a direction directly opposite to the direction of this stream of liquid to be filtered transporting these food particles.
  • This or these liquid jets 45, 46 are in fact on the downstream side of this stream of liquid to be filtered.
  • the second means of exposure for a predetermined minimum time to, to these first means, of the "outlet" face of this microfilter 40 comprise an assembly of this microfilter 40 in an area exposed to the jets of liquids 45, 46 projected by the reel sprinkler 5 and adjoining the axis of rotation 43 of this sprinkler 5.
  • liquid jets 45, 46 are perpendicular to the "outlet" face of the microfilter 40.
  • Certain known dishwashers include, below their lower spray reel and concentrically with the axis of rotation of the latter, a cylindrical microfilter with a vertically oriented wall and exposed to jets of liquid with a grazing incidence on its surface, originating from this watering reel.
  • These jets of liquid allow to push back towards the bottom, in a drain well, food waste on the surface of this microfilter, but prove to be unsuitable for delaying the penetration and progression of this waste in the meshes of this microfilter because these jets are located on the upstream side of the liquid stream passing through this microfilter and transporting this waste, and tend rather to push this waste against this microfilter and to accentuate their penetration and their progression in the meshes of the latter.
  • the microfilter is arranged in a zone below the lower spray reel adjoining the axis of rotation of this reel, the microfilter 40 being, in the example illustrated, concentric with the axis of rotation 43 of the lower watering reel 5 and arranged below the latter, on the other hand the microfilter comprises each mesh or each group of meshes of the surface of its "outlet" face, swept for a predetermined minimum time to by jets of liquid coming from the lower face of the lower watering reel and projected in a direction directly opposite to that of this current of liquid to be filtered coming from the opposite face of this microfilter. ie its "entry" side.
  • the liquid jets 45, 46 coming from the lower face of the lower watering reel 5 are projected perpendicular to the "outlet" face of the microfilter 40 with a predetermined power p for a given pressure Pm of liquid at filter on the "inlet" face of this microfilter 40.
  • these jets of liquid 45, 46 create against these food particles a powerful barrier and an effective repulsion which annihilate and slow down the penetration and the progression of these food particles in the meshes of this microfilter 40 and prevent the clogging and clogging of this latest.
  • the microfilter 40 being concentric with the axis of rotation 43 of the watering reel 5 and the liquid jets 45 and 46 being disposed in this reel from the proximity of this axis of rotation 43 towards the outside, at every instant there is at least one mesh or a group of meshes or an area of this microfilter swept by these jets of liquid.
  • the microfilter 40 is permanently subjected to the action of these jets of liquid 45, 46.
  • a scan for a predetermined minimum time t0 of each mesh or group of meshes of the microfilter 40 carried out by these jets of liquid 45, 46 does not leave the food particles transported by the current of liquid to be filtered, the time to become encrusted and progress in the meshes of this microfilter 40 and to cause an obstruction of this microfilter.
  • the microfilter 40 thus becomes practically non-pluggable for these food particles and does not require any periodic manual cleaning by brushing for example, and the microfilter 40 can without drawback be non-removable.
  • the liquid jets 45, 46 coming from the lower face of the lower watering reel 5 are arranged either on the two sides of the axis of rotation 43 to cover at all times on one side of this axis (side of the jets 46) , a partial internal radial scanning zone of this microfilter 40 and on the other side of this axis (side of the jets 45), a partial external radial scanning zone of this microfilter is on only one side of this axis of rotation 43 for cover at all times an entire radial area (not shown) of scanning of this microfilter, ie on both sides of this axis 43 to cover an entire diametral area (not shown) of scanning of this microfilter.
  • the efficiency of the liquid jets 45, 46 projected perpendicular to the face of the microfilter 40 which is arranged concentrically with the axis of rotation of the lower sprinkler 5 is further enhanced by means of adjusting the pressure of the liquid stream. of washing or rinsing to be filtered at this microfilter.
  • These means for adjusting the pressure of the current of washing or rinsing liquid to be filtered are constituted either by a safety valve of the spring valve type or by a height H of a column of liquid in a safety or shedding of the microfilter for an escape of the stream of liquid to be filtered in the event of clogging of this microfilter, either by an injector of the venturi type.
  • the microfilter 40 supplied with liquid by the recycling pump 10 through the bypass pipe 27 and the partitioned section 15 of the inlet 14 of the drain pump 18, is protected against an overpressure of the stream of liquid to be filtered by a safety or load shedding pipe 28 having a first low end connected to the bypass pipe 27 and a second high end 29 opens into the tank 2 au- above these medium filters 20 and coarse 22, at a point situated relative to the surface of this microfilter 25, at a height H, so as to constitute a column of liquid equivalent to a predetermined pressure Pm admitted without causing deformation of the microfilter 40 and an untimely emptying of the tank 2 through the drain pipe 19.
  • the force of penetration of the food particles into the meshes of the microfilter 40 is adjusted and at the same time reinforces the effectiveness of the repulsion against the penetration and progression of these food particles in the meshes of the microfilter 40, effected by the perpendicular jets of liquid 45, 46.
  • the food particles contained in the stream of liquid ejected from the safety or load shedding pipe 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 also avoided.
  • the microfilter 40 is supplied with liquid current by the recycling pump 10 through the bypass pipe 27 and an injector 50 of the venturi type disposed in the inlet 14 of the drain pump 18.
  • the chosen diameter of the outlet of the injector 50 determines the pressure of the stream of liquid to be filtered sent through the microfilter.
  • the injector 50 is on the one hand separated from the inlet opening of the drain pump 18 by a non-return type valve 52 and on the other hand in communication with the sump 8 of the tank 2 through the medium filter 20 and the coarse filter 22.
  • the microfilter 40 When the microfilter 40 is dirty, the current of liquid to be filtered which cannot pass through its meshes, flows back into the inlet 14 and returns to the sump 8 of the tank 2, the valve 52 in this inlet 14 being closed by a column of liquid formed in the drain pipe 19 when the dishwasher 1 begins to operate.
  • the nominal flow rate of the liquid stream to be filtered in the microfilter 40 is adjusted and at the same time the force of penetration of the food particles transported by this stream of liquid to be filtered in the meshes. of this microfilter.
  • the microfilter disposed in the vicinity of the axis of rotation of the lower sprinkler and having a surface in an arc of a circle extends only partially around this axis of rotation.
  • each mesh or group of meshes of the surface of the "outlet" face of this microfilter is subjected for a minimum predetermined time to the action of the jets of liquid coming from the underside of the lower watering reel and projected in a direction directly opposite to that of the current of liquid to be filtered coming from the opposite face of this microfilter, that is to say its "inlet" face.

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  • Washing And Drying Of Tableware (AREA)
  • Detergent Compositions (AREA)

Abstract

Dishwasher with a microfilter which it is practically impossible to block with particles of food conveyed by a stream of washing or rinsing liquid to be filtered, characterised in that it comprises means for eliminating and slowing down the progression of these particles of food at the entry and in the meshes of this microfilter. <IMAGE>

Description

La présente invention concerne un lave-vaisselle à microfiltre pratiquement non bouchable. Dans un lave vaisselle connu à microfiltre, on crée habituellement par dérivation du circuit de liquide de l'appareil, un courant de liquide à filtrer et dispose dans ce courant de liquide, un microfiltre pour retenir des microparticules alimentaires, les empêcher de réintégrer le circuit de liquide de l'appareil et de souiller la vaisselle en lavage ou en rinçage. Au fur et à mesure de leur accumulation, ces microparticules bouchent les mailles du microfiltre, et interdisent le passage au courant de liquide à filtrer.The present invention relates to a microfilter dishwasher that is practically non-pluggable. In a known dishwasher with microfilter, a flow of liquid to be filtered is usually created by bypassing the device's liquid circuit, and a microfilter is used in this liquid current to retain food microparticles, preventing them from re-entering the circuit liquid from the appliance and soil the dishes when washing or rinsing. As they accumulate, these microparticles block the mesh of the microfilter, and prevent passage of the current of liquid to be filtered.

Périodiquement le microfiltre est nettoyé par un envoi volontaire d'un courant inverse de liquide à travers ses mailles pour déboucher celles-ci et vidanger les particules alimentaires retenues par ce microfiltre.Periodically the microfilter is cleaned by a voluntary sending of a reverse current of liquid through its meshes to unclog these and drain the food particles retained by this microfilter.

Cependant un tel courant inverse de liquide se révèle souvent impuissant à débarrasser les mailles du microfiltre, de ces particules alimentaires qui y pénètrent profondément et s'y accrochent solidement. Le microfiltrage du liquide de lavage ou de rinçage devient alors aléatoire ou finit par être complètement interrompu. Un nettoyage manuel par brossage par exemple de ce microfiltre s'impose si l'on veut obtenir une vaisselle lavée ou rincée dépourvue de toute trace de dépôt de microparticules alimentaires.However, such a reverse flow of liquid often proves to be incapable of ridding the meshes of the microfilter of these food particles which penetrate therein deeply and cling to it securely. The microfiltration of the washing or rinsing liquid then becomes random or ends up being completely interrupted. Manual cleaning by brushing, for example, of this microfilter is essential if you want to obtain washed or rinsed dishes devoid of any trace of deposit of food microparticles.

La présente invention visant à éviter ces inconvénients, permet de réaliser un lave-vaisselle ayant un microfiltre pratiquement non bouchable par des particules alimentaires et n'exigeant ainsi aucun nettoyage manuel, tout en contribuant à donner à la vaisselle lavée ou rincée une excellente propreté sans trace de dépôt de microparticules alimentaires.The present invention aims to avoid these drawbacks, makes it possible to produce a dishwasher having a microfilter which is practically not clogged with food particles and thus does not require any manual cleaning, while helping to give the washed or rinsed dishes excellent cleanliness without trace of deposit of food microparticles.

Selon l'invention, un lave-vaisselle est caractérisé en ce qu'il comprend des moyens d'annihilation et de ralentissement de la progression de ces particules alimentaires à l'entrée et dans les mailles de ce microfiltre.According to the invention, a dishwasher is characterized in that it comprises means of annihilation and of slowing down the progression of these food particles at the entry and in the meshes of this microfilter.

Pour mieux faire comprendre l'invention, on en décrit ci-après un certain nombre d'exemples de réalisation, illustrés par des dessins ci-annexés dont :

  • la figure 1 représente une vue schématique et partielle d'un lave-vaisselle à microfiltre pratiquement non bouchable par des particules alimentaires, et
  • la figure 2 représente une variante de réalisation du lave-vaisselle de la figure 1.
To better understand the invention, a number of embodiments are described below, illustrated by the attached drawings, including:
  • FIG. 1 represents a schematic and partial view of a microfilter dishwasher practically not clogable with food particles, and
  • FIG. 2 represents an alternative embodiment of the dishwasher of FIG. 1.

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 inlet 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, qui arrête les grosses et moyennes particules alimentaires, 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 à travers laquelle est monté le filtre gros 22 qui arrête les grosses particules alimentaires ou les gros déchets risquant de bloquer le fonctionnement de cette pompe de vidange 18.
Un microfiltre 40 illustré dans la figure 1 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 et un tronçon cloisonné 15 de l'entrée 14 de la pompe de vidange 18.The sump 8 is covered by a medium filter 20 and a coarse filter 22. The medium filter 20, which stops large and medium food particles, separates the recycling pump 10 from the tank 2 and from the inlet 14 of the drain 18, and puts the tank 2 in communication with the inlet 14 of the drain pump 18, through its tubular opening 21 through which is mounted the large filter 22 which stops large food particles or large waste likely to block the operation of this drain pump 18.
A microfilter 40 illustrated in FIG. 1 is mounted in the tank 2 and filters small particles or food microparticles conveyed by a stream of liquid sent by the recycling pump 10 through a bypass pipe 27 and a partitioned section 15 of the inlet 14 of the drain pump 18.

Ce courant de liquide ne représente qu'une fraction du liquide refoulé par la pompe de recyclage 10. Le microfiltre 40 laisse passer dans la cuve 2 du liquide filtré et retient des microparticules alimentaires.This liquid stream represents only a fraction of the liquid discharged by the recycling pump 10. The microfilter 40 lets filtered liquid through the tank 2 and retains food microparticles.

Deux clapets du type antiretour 16, 17 sont montés dans l'entrée 14 de la pompe de vidange 18 pour délimiter le tronçon cloisonné 15. Le clapet 16 sépare le tronçon 15 et l'ouverture d'admission de la pompe de vidange 18 tandis que le clapet 17 sépare le puisard 8 et le tronçon 15. Les clapets 16 et 17 étant normalement dans leur position de fermeture sont susceptibles d'être ouverts uniquement dans la direction de la pompe de vidange 18 mais complètement bloqués en fermeture dans la direction opposée.Two non-return type valves 16, 17 are mounted in the inlet 14 of the drain pump 18 to delimit the partitioned section 15. The valve 16 separates the section 15 and the inlet opening of the drain pump 18 while the valve 17 separates the sump 8 and the section 15. The valves 16 and 17 being normally in their closed position are capable of being opened only in the direction of the drain pump 18 but completely blocked in closing in the opposite direction.

Durant le fonctionnement du lave-vaisselle 1 en lavage ou en rinçage, le microfiltre 40 débarrasse au fur et à mesure le liquide dans le 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 40 par ces particules alimentaires gêne et empêche progressivement un libre passage du courant de liquide à filtrer et simultanément fait monter au niveau de la surface du microfiltre, la pression du liquide qui aggrave le colmatage de ce microfiltre et peut le déformer. Selon une constatation inattendue menant à l'invention, le colmatage du microfiltre 40 est fonction à la fois de la pression du courant de liquide à filtrer et du temps laissé aux particules alimentaires pour pénétrer et progresser dans les mailles de ce microfiltre. Autrement dit pour un temps donné laissé à la pénétration et à la progression de ces particules alimentaires, plus la pression du courant de liquide à filtrer est grande, plus la pénétration et l'avancement de ces particules alimentaires dans les mailles du microfiltre 40 sont profonds et plus le colmatage de ce microfiltre est solide ou pour une pression donnée de ce courant de liquide à filtrer, plus le temps laissé à la pénétration et à la progression de ces particules alimentaires est important, plus l'avancement de ces particules alimentaires dans les mailles du microfiltre 40 est grand et plus le colmatage est confirmé.During the operation of the dishwasher 1 in washing or in rinsing, the microfilter 40 gradually rids the liquid in the tank 2, of all these food microparticles, which makes it possible to obtain at the end of a washing or d '' rinse, clean dishes without traces of food particles. Clogging of this microfilter 40 by these food particles obstructs and gradually prevents a free passage of the stream of liquid to be filtered and simultaneously increases the level of the liquid pressure at the surface of the microfilter, which worsens the clogging of this microfilter and can deform it. . According to an unexpected finding leading to the invention, the clogging of the microfilter 40 is a function both of the pressure of the stream of liquid to be filtered and of the time left for the food particles to penetrate and progress through the meshes of this microfilter. In other words for a given time left for the penetration and progression of these food particles, the greater the pressure of the stream of liquid to be filtered, the more the penetration and advancement of these food particles in the meshes of the microfilter 40 are deep and the more the clogging of this microfilter is solid or for a given pressure of this stream of liquid to be filtered, the greater the time left for the penetration and progression of these food particles the greater the advancement of these food particles in the meshes of the microfilter 40 and the more the clogging is confirmed.

Quand leur pénétration dans les mailles du microfiltre est profonde, ces particules alimentaires sont difficiles à être délogées et une obstruction du microfiltre 40 devient persistante.When their penetration into the meshes of the microfilter is deep, these food particles are difficult to be dislodged and an obstruction of the microfilter 40 becomes persistent.

Pour cette raison, dans des lave-vaisselle connus à microfiltre, leur microfiltre doit être périodiquement nettoyé manuellement par brossage par exemple pour le délivrer d'une gênante obstruction par des particules alimentaires, bien que ce microfiltre soit déjà exposé, pour son décolmatage, à un ou plusieurs passages d'un courant de liquide à travers ses mailles suivant un sens opposé à celui du courant de liquide à filtrer.For this reason, in known dishwashers with microfilter, their microfilter must be periodically cleaned manually by brushing for example to deliver it from a troublesome obstruction by food particles, although this microfilter is already exposed, for its unclogging, to one or more passages of a stream of liquid through its meshes in a direction opposite to that of the stream of liquid to be filtered.

Pour faciliter un nettoyage manuel du microfiltre, ce microfiltre est habituellement démontable et disposé dans un endroit aisément accessible.To facilitate manual cleaning of the microfilter, this microfilter is usually removable and placed in an easily accessible location.

Selon l'invention, un lave-vaisselle à microfiltre pratiquement non bouchable par des particules alimentaires transportées par un courant de liquide de lavage ou de rinçage à filtrer comprend des moyens d'annihilation et de ralentissement de la progression de ces particules alimentaires dans les mailles de ce microfiltre.According to the invention, a microfilter dishwasher practically not clogable by food particles transported by a current of washing or rinsing liquid to be filtered comprises means for annihilating and slowing down the progression of these food particles in the meshes of this microfilter.

L'efficacité de ces moyens d'annihilation et de ralentissement de la progression des particules alimentaires dans les mailles du microfiltre est, selon l'invention, encore renforcée quand ils sont combinés avec des moyens de réglage de la pression du courant de liquide à filtrer au niveau de ce microfiltre. Ces moyens de réglage de pression contribuant à réduire la force de pénétration de ces particules alimentaires dans les mailles de ce microfiltre.The effectiveness of these means of annihilation and of slowing down the progression of food particles in the meshes of the microfilter is, according to the invention, further enhanced when they are combined with means for adjusting the pressure of the stream of liquid to be filtered. at the level of this microfilter. These pressure adjustment means helping to reduce the force of penetration of these food particles into the meshes of this microfilter.

Les moyens d'annihilation et de ralentissement de la progression des particules alimentaires transportées par le courant de liquide à filtrer, à l'entrée et dans les mailles du microfiltre 40 sont une combinaison des premiers moyens opérant par repoussement, à l'encontre de la pénétration et de la progression de ces particules alimentaires dans les mailles de ce microfiltre et des deuxièmes moyens d'exposition pendant un temps minimum prédéterminé to, à ces premiers moyens, au cours du lavage ou rinçage, maille par maille ou groupe de mailles par groupe de mailles de la face "sortie" de ce microfiltre. La face "entrée" et la face "sortie" du microfiltre sont définies par rapport au courant de liquide traversant ce microfiltre. La face "entrée" est celle où entre ce courant de liquide et la face "sortie" est celle où sort ce courant.The means of annihilation and slowing down of the progression of the food particles transported by the stream of liquid to be filtered, at the inlet and in the meshes of the microfilter 40 are a combination of the first means operating by repelling, against the penetration and the progression of these food particles in the meshes of this microfilter and of the second means of exposure for a predetermined minimum time to, to these first means, during washing or rinsing, mesh by mesh or group of meshs by group of meshs of the "exit" face of this microfilter. The "inlet" side and the "outlet" side of the microfilter are defined with respect to the flow of liquid passing through this microfilter. The "inlet" side is where the flow of liquid enters and the "outlet" side is where the stream comes out.

Les premiers moyens opérant par repoussement à l'encontre de la pénétration et de la progression des particules alimentaires dans les mailles du microfiltre 40 sont constitués par un ou des jets de liquide 45, 46 projetés par le moulinet d'arrosage 5 sur la face "sortie" de ce microfiltre 40 suivant un sens directement opposé au sens de ce courant de liquide à filtrer transportant ces particules alimentaires. Ce ou ces jets de liquide 45, 46 se trouvent en effet du côté aval de ce courant de liquide à filtrer. Les deuxièmes moyens d'exposition pendant un temps minimum prédéterminé to, à ces premiers moyens, de la face " sortie " de ce microfiltre 40 comprennent un montage de ce microfiltre 40 dans une zone exposée aux jets de liquides 45, 46 projetés par le moulinet d'arrosage 5 et jouxtant l'axe de rotation 43 de ce moulinet d'arrosage 5.The first means operating by pushing against the penetration and the progression of food particles in the meshes of the microfilter 40 consist of one or more liquid jets 45, 46 projected by the sprinkler 5 on the face " outlet "of this microfilter 40 in a direction directly opposite to the direction of this stream of liquid to be filtered transporting these food particles. This or these liquid jets 45, 46 are in fact on the downstream side of this stream of liquid to be filtered. The second means of exposure for a predetermined minimum time to, to these first means, of the "outlet" face of this microfilter 40 comprise an assembly of this microfilter 40 in an area exposed to the jets of liquids 45, 46 projected by the reel sprinkler 5 and adjoining the axis of rotation 43 of this sprinkler 5.

Dans l'exemple illustré, les jets de liquide 45, 46 sont perpendiculaires à la face "sortie" du microfiltre 40.In the example illustrated, the liquid jets 45, 46 are perpendicular to the "outlet" face of the microfilter 40.

Certains lave-vaisselle connus comprennent en dessous de leur moulinet inférieur d'arrosage et concentriquement à l'axe de rotation de ce dernier, un microfiltre cylindrique à paroi verticalement orientée et exposée à des jets de liquide à incidence rasante sur sa surface, issus de ce moulinet d'arrosage. Ces jets de liquide permettent de refouler vers le bas, dans un puits de vidange, des déchets alimentaires sur la surface de ce microfiltre, mais se révèlent inadaptés à retarder la pénétration et la progression de ces déchets dans les mailles de ce microfiltre car ces jets se trouvent du côté amont du courant de liquide traversant ce microfiltre et transportant ces déchets, et tendent plutôt à pousser ces déchets contre ce microfiltre et à accentuer leur pénétration et leur progression dans les mailles de ce dernier.Certain known dishwashers include, below their lower spray reel and concentrically with the axis of rotation of the latter, a cylindrical microfilter with a vertically oriented wall and exposed to jets of liquid with a grazing incidence on its surface, originating from this watering reel. These jets of liquid allow to push back towards the bottom, in a drain well, food waste on the surface of this microfilter, but prove to be unsuitable for delaying the penetration and progression of this waste in the meshes of this microfilter because these jets are located on the upstream side of the liquid stream passing through this microfilter and transporting this waste, and tend rather to push this waste against this microfilter and to accentuate their penetration and their progression in the meshes of the latter.

Il en résulte que les microfiltres de ces lave-vaisselle connus ne sont pas décolmatés et s'encrassent rapidement durant le fonctionnement de ces appareils. Un nettoyage manuel de ces microfiltres par brossage par exemple devient nécessaire pour les débarrasser des particules alimentaires qui pénètrent profondément dans leurs mailles.As a result, the microfilters of these known dishwashers are not unclogged and clog quickly during the operation of these devices. Manual cleaning of these microfilters by brushing for example becomes necessary to rid them of food particles which penetrate deep into their meshes.

Dans un lave-vaisselle réalisé selon l'invention, d'une part le microfiltre est disposé dans une zone en-dessous du moulinet inférieur d'arrosage jouxtant l'axe de rotation de ce moulinet, le microfiltre 40 étant, dans l'exemple illustré, concentrique à l'axe de rotation 43 du moulinet inférieur d'arrosage 5 et disposé en-dessous de ce dernier, d'autre part le microfiltre comprend chaque maille ou chaque groupe de mailles de la surface de sa face " sortie ", balayé pendant un temps minimum prédéterminé to par des jets de liquide issus de la face inférieure du moulinet inférieur d'arrosage et projetés suivant un sens directement opposé à celui de ce courant de liquide à filtrer venant de la face opposée de ce microfiltre c'est-à-dire sa face "entrée".In a dishwasher produced according to the invention, on the one hand the microfilter is arranged in a zone below the lower spray reel adjoining the axis of rotation of this reel, the microfilter 40 being, in the example illustrated, concentric with the axis of rotation 43 of the lower watering reel 5 and arranged below the latter, on the other hand the microfilter comprises each mesh or each group of meshes of the surface of its "outlet" face, swept for a predetermined minimum time to by jets of liquid coming from the lower face of the lower watering reel and projected in a direction directly opposite to that of this current of liquid to be filtered coming from the opposite face of this microfilter. ie its "entry" side.

Pour une vitesse donnée de rotation du moulinet inférieur d'arrosage où partent des jets de liquide de balayage du microfiltre, plus ces jets de liquide s'éloignent de l'axe de rotation de ce moulinet, plus la vitesse d'entraînement de ces jets est grande et par conséquent plus le temps de passage t de ces jets de liquide dans chaque maille ou chaque groupe de mailles de ce microfiltre est court.For a given speed of rotation of the lower watering reel where jets of microfilter sweeping liquid leave, the more these liquid jets move away from the axis of rotation of this reel, the more the speed of drive of these jets is large and therefore the shorter the passage time t of these jets of liquid in each mesh or each mesh group of this microfilter is short.

Pour une pression donnée de liquide sur la face "entrée" du microfiltre et une puissance prédéterminée des jets de liquide de balayage projetés sur la face "sortie" de ce microfiltre et lorsque le temps de passage t des ces jets de liquides dans chaque maille ou groupe de mailles de ce microfiltre est trop court ou insuffisant, l'action de ces jets de liquide dévient insignifiante ou nulle, car l'entrée des particules alimentaires dans la ou les mailles de ce microfiltre n'est pas retardée et les particules alimentaires qui se trouvent déjà dans la ou les mailles de ce microfiltre, ne sont pas repoussées ou délogées. Dans l'exemple illustré, les jets de liquide 45, 46 issus de la face inférieure du moulinet inférieur d'arrosage 5 sont projetés perpendiculairement à la face "sortie" du microfiltre 40 avec une puissance prédéterminée p pour une pression donnée Pm de liquide à filtrer sur la face "entrée" de ce microfiltre 40. Etant dirigés en opposition directe avec le sens du courant de liquide à filtrer transportant des particules alimentaires, et pendant un temps minimum préétabli de passage to dans chaque maille ou groupe de mailles du microfiltre 40, ces jets de liquide 45, 46 créent contre ces particules alimentaires un puissant barrage et une efficace repoussée qui annihilent et ralentissent la pénétration et la progression de ces particules alimentaires dans les mailles de ce microfiltre 40 et empêchent l'encrassement et le colmatage de ce dernier.For a given pressure of liquid on the face "inlet" of the microfilter and a predetermined power of the jets of sweeping liquid projected onto the "outlet" face of this microfilter and when the time of passage t of these jets of liquids in each mesh or group of meshes of this microfilter is too short or insufficient, the action of these jets of liquid becomes insignificant or zero, because the entry of food particles into the mesh (s) of this microfilter is not delayed and the food particles which are already in the mesh (s) of this microfilter, are not repelled or dislodged. In the example illustrated, the liquid jets 45, 46 coming from the lower face of the lower watering reel 5 are projected perpendicular to the "outlet" face of the microfilter 40 with a predetermined power p for a given pressure Pm of liquid at filter on the "inlet" face of this microfilter 40. Being directed in direct opposition to the direction of the current of liquid to be filtered carrying food particles, and for a pre-established minimum time of passage to in each mesh or group of meshes of the microfilter 40 , these jets of liquid 45, 46 create against these food particles a powerful barrier and an effective repulsion which annihilate and slow down the penetration and the progression of these food particles in the meshes of this microfilter 40 and prevent the clogging and clogging of this latest.

Le microfiltre 40 étant concentrique à l'axe de rotation 43 du moulinet d'arrosage 5 et les jets de liquide 45 et 46 étant disposés dans ce moulinet depuis la proximité de cet axe de rotation 43 vers l'extérieur, à chaque instant il existe au moins une maille ou un groupe de mailles ou une zone de ce microfiltre balayé par ces jets de liquide. Ainsi le microfiltre 40 est en permanence soumis à l'action de ces jets de liquide 45, 46.The microfilter 40 being concentric with the axis of rotation 43 of the watering reel 5 and the liquid jets 45 and 46 being disposed in this reel from the proximity of this axis of rotation 43 towards the outside, at every instant there is at least one mesh or a group of meshes or an area of this microfilter swept by these jets of liquid. Thus, the microfilter 40 is permanently subjected to the action of these jets of liquid 45, 46.

Un balayage pendant un temps miminum prédéterminé to de chaque maille ou groupe de mailles du microfiltre 40 effectué par ces jets de liquide 45, 46 ne laisse pas aux particules alimentaires transportées par le courant de liquide à filtrer, le temps de s'incruster et progresser dans les mailles de ce microfiltre 40 et d'entraîner une obstruction de ce microfiltre. Le microfiltre 40 devient ainsi pratiquement non bouchable pour ces particules alimentaires et n'exige aucun nettoyage manuel périodique par brossage par exemple, et le microfiltre 40 peut sans inconvénient être non démontable.A scan for a predetermined minimum time t0 of each mesh or group of meshes of the microfilter 40 carried out by these jets of liquid 45, 46 does not leave the food particles transported by the current of liquid to be filtered, the time to become encrusted and progress in the meshes of this microfilter 40 and to cause an obstruction of this microfilter. The microfilter 40 thus becomes practically non-pluggable for these food particles and does not require any periodic manual cleaning by brushing for example, and the microfilter 40 can without drawback be non-removable.

Les jets de liquide 45, 46 issus de la face inférieure du moulinet inférieur d'arrosage 5 sont disposés soit sur les deux côtés de l'axe de rotation 43 pour couvrir à chaque instant sur un côté de cet axe (côté des jets 46), une zone radiale partielle intérieure de balayage de ce microfiltre 40 et sur l'autre côté de cet axe (côté des jets 45), une zone radiale partielle extérieure de balayage de ce microfiltre soit sur un seul côté de cet axe de rotation 43 pour couvrir à chaque instant une zone radiale entière (non représentée) de balayage de ce microfiltre soit sur les deux côtés de cet axe 43 pour couvrir une zone diamétrale entière (non représentée) de balayage de ce microfiltre.The liquid jets 45, 46 coming from the lower face of the lower watering reel 5 are arranged either on the two sides of the axis of rotation 43 to cover at all times on one side of this axis (side of the jets 46) , a partial internal radial scanning zone of this microfilter 40 and on the other side of this axis (side of the jets 45), a partial external radial scanning zone of this microfilter is on only one side of this axis of rotation 43 for cover at all times an entire radial area (not shown) of scanning of this microfilter, ie on both sides of this axis 43 to cover an entire diametral area (not shown) of scanning of this microfilter.

L'efficacité des jets de liquide 45, 46 projetés perpendiculairement à la face du microfiltre 40 qui est disposé concentriquement à l'axe de rotation du moulinet inférieur d'arrosage 5 est encore renforcée par des moyens de réglage de la pression du courant de liquide de lavage ou de rinçage à filtrer au niveau de ce microfiltre.The efficiency of the liquid jets 45, 46 projected perpendicular to the face of the microfilter 40 which is arranged concentrically with the axis of rotation of the lower sprinkler 5 is further enhanced by means of adjusting the pressure of the liquid stream. of washing or rinsing to be filtered at this microfilter.

Ces moyens de réglage de la pression du courant de liquide de lavage ou de rinçage à filtrer sont constitués soit par une valve de sécurité du type à soupape à ressort soit par une hauteur H d'une colonne de liquide dans une canalisation de sécurité ou de délestage du microfiltre pour un échappement du courant de liquide à filtrer en cas d'un colmatage de ce microfiltre, soit par un injecteur du type venturi.These means for adjusting the pressure of the current of washing or rinsing liquid to be filtered are constituted either by a safety valve of the spring valve type or by a height H of a column of liquid in a safety or shedding of the microfilter for an escape of the stream of liquid to be filtered in the event of clogging of this microfilter, either by an injector of the venturi type.

Dans l'exemple illustré, le microfiltre 40 alimenté en liquide par la pompe de recyclage 10 à travers la canalisation de dérivation 27 et le tronçon cloisonné 15 de l'entrée 14 de la pompe de vidange 18, est protégé contre une surpression du courant de liquide à filtrer par une canalisation de sécurité ou de délestage 28 ayant une première extrémité basse reliée à la canalisation de dérivation 27 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, de manière à constituer une colonne de liquide équivalente à une pression prédéterminée Pm admise sans provoquer une déformation de microfiltre 40 et une vidange intempestive de la cuve 2 à travers le tuyau de vidange 19.In the example illustrated, the microfilter 40 supplied with liquid by the recycling pump 10 through the bypass pipe 27 and the partitioned section 15 of the inlet 14 of the drain pump 18, is protected against an overpressure of the stream of liquid to be filtered by a safety or load shedding pipe 28 having a first low end connected to the bypass pipe 27 and a second high end 29 opens into the tank 2 au- above these medium filters 20 and coarse 22, at a point situated relative to the surface of this microfilter 25, at a height H, so as to constitute a column of liquid equivalent to a predetermined pressure Pm admitted without causing deformation of the microfilter 40 and an untimely emptying of the tank 2 through the drain pipe 19.

Il en résulte que, quand le microfiltre 40 est encrassé et la pression de liquide au niveau de la surface de ce microfiltre devient supérieure à Pm, ou à la hauteur H de la colonne de liquide dans la canalisation de sécurité 28, le courant de liquide à filtrer venant de la pompe de recyclage 10 par la canalisation 27, emprunte la canalisation de sécurité ou voie de délestage 28 et se déverse dans la cuve 2, au-dessus des filtres moyen 20 et gros 22, à travers son extrémité haute 29.As a result, when the microfilter 40 is dirty and the liquid pressure at the surface of this microfilter becomes greater than Pm, or at the height H of the liquid column in the safety line 28, the liquid stream to be filtered coming from the recycling pump 10 through the pipe 27, borrows the safety pipe or load-shedding path 28 and pours into the tank 2, above the medium filters 20 and coarse 22, through its high end 29.

En réglant la hauteur H de la colonne de liquide formée dans la canalisation de sécurité ou de délestage 28 on règle la force de pénétration des particules alimentaires dans les mailles du microfiltre 40 et renforce en même temps l'efficacité du repoussement à l'encontre de la pénétration et de la progression de ces particules alimentaires dans les mailles du microfiltre 40, effectués par les jets perpendiculaires de liquide 45, 46. Les particules alimentaires contenues dans le courant de liquide éjecté de la canalisation de sécurité ou de délestage 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 également évité.By adjusting the height H of the column of liquid formed in the safety or load-shedding line 28, the force of penetration of the food particles into the meshes of the microfilter 40 is adjusted and at the same time reinforces the effectiveness of the repulsion against the penetration and progression of these food particles in the meshes of the microfilter 40, effected by the perpendicular jets of liquid 45, 46. The food particles contained in the stream of liquid ejected from the safety or load shedding pipe 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 also avoided.

Dans une variante de réalisation illustrée à la figure 2, le microfiltre 40 est alimenté en courant de liquide par la pompe de recyclage 10 à travers la canalisation de dérivation 27 et un injecteur 50 du type venturi disposé dans l'entrée 14 de la pompe de vidange 18. Le diamètre choisi de la sortie de l'injecteur 50 détermine la pression du courant de liquide à filtrer envoyé à travers le microfiltre. Dans l'entrée 14, l'injecteur 50 est d'une part séparé de l'ouverture d'admission de la pompe de vidange 18 par un clapet du type anti-retour 52 et d'autre part en communication avec le puisard 8 de la cuve 2 à travers le filtre moyen 20 et le filtre gros 22.In an alternative embodiment illustrated in the figure 2, the microfilter 40 is supplied with liquid current by the recycling pump 10 through the bypass pipe 27 and an injector 50 of the venturi type disposed in the inlet 14 of the drain pump 18. The chosen diameter of the outlet of the injector 50 determines the pressure of the stream of liquid to be filtered sent through the microfilter. In inlet 14, the injector 50 is on the one hand separated from the inlet opening of the drain pump 18 by a non-return type valve 52 and on the other hand in communication with the sump 8 of the tank 2 through the medium filter 20 and the coarse filter 22.

Quand le microfiltre 40 est encrassé, le courant de liquide à filtrer ne pouvant pas passer à travers ses mailles, reflue dans l'entrée 14 et retourne dans le puisard 8 de la cuve 2, le clapet 52 dans cette entrée 14 étant fermé par une colonne de liquide formée dans le tuyau de vidange 19 lors du début du fonctionnement du lave-vaisselle 1.When the microfilter 40 is dirty, the current of liquid to be filtered which cannot pass through its meshes, flows back into the inlet 14 and returns to the sump 8 of the tank 2, the valve 52 in this inlet 14 being closed by a column of liquid formed in the drain pipe 19 when the dishwasher 1 begins to operate.

En choisissant la dimension de la sortie de l'injecteur 50, on règle le débit nominal du courant de liquide à filtrer dans le microfiltre 40 et en même temps la force de pénétration des particules alimentaires transportées par ce courant de liquide à filtrer dans les mailles de ce microfiltre.By choosing the size of the outlet of the injector 50, the nominal flow rate of the liquid stream to be filtered in the microfilter 40 is adjusted and at the same time the force of penetration of the food particles transported by this stream of liquid to be filtered in the meshes. of this microfilter.

Dans une autre variante de réalisation non représentée, le microfiltre disposé dans la proximité de l'axe de rotation du moulinet inférieur d'arrosage et ayant une surface en arc de cercle ne s'étend que partiellement autour de cet axe de rotation. Périodiquement chaque maille ou groupe de mailles de la surface de la face "sortie" de ce microfiltre est soumis(e) pendant un temps minimum prédéterminé to à l'action des jets de liquide issus de la face inférieure du moulinet inférieur d'arrosage et projetés suivant un sens directement opposé à celui du courant de liquide à filtrer venant de la face opposée de ce microfiltre, c'est-à-dire sa face "entrée". Ces jets de liquide créent contre les particules alimentaires transportées par ce courant de liquide à filtrer un puissant barrage et une efficace repoussée qui annihibent et ralentissent leur pénétration et leur progression dans cette maille ou ce groupe de mailles et empêchent l'encrassement et le colmatage de ce microfiltre.In another alternative embodiment, not shown, the microfilter disposed in the vicinity of the axis of rotation of the lower sprinkler and having a surface in an arc of a circle extends only partially around this axis of rotation. Periodically each mesh or group of meshes of the surface of the "outlet" face of this microfilter is subjected for a minimum predetermined time to the action of the jets of liquid coming from the underside of the lower watering reel and projected in a direction directly opposite to that of the current of liquid to be filtered coming from the opposite face of this microfilter, that is to say its "inlet" face. These jets of liquid create against the food particles transported by this current of liquid to be filtered a powerful barrier and an effective repulsion which annihilate and slow down their penetration and progression in this mesh or this group of meshes and prevent fouling and clogging of this microfilter.

Claims (9)

Lave-vaisselle à microfltre pratiquement non bouchable par des particules alimentaires transportées par un courant de liquide de lavage ou de rinçage à filtrer, caractérisé en ce qu'il comprend des premiers moyens d'annihilation et de ralentissement (40, 43, 45, 46) de la progression de ces particules alimentaires à l'entrée et dans les mailles de ce microfiltre (40), combinés avec des seconds moyens de réglage de la pression de ce courant de liquide à filtrer, au niveau de ce microfiltre, réduisant la force de pénétration des particules alimentaires dans les mailles du microfiltre (40).Microfilters dishwasher practically not clogable by food particles transported by a current of washing or rinsing liquid to be filtered, characterized in that it comprises first means of annihilation and slowing down (40, 43, 45, 46 ) of the progression of these food particles at the entry and in the meshes of this microfilter (40), combined with second means for adjusting the pressure of this stream of liquid to be filtered, at the level of this microfilter, reducing the force of penetration of the food particles into the meshes of the microfilter (40). Lave-vaisselle selon la revendication 1, caractérisé en ce que les moyens d'annihilation et de ralentissement de la progression de ces particules alimentaires à l'entrée et dans les mailles du microfiltre sont constitués par un ou plusieurs jets de liquide (45, 46) projeté(s) par un moulinet d'arrosage (5) sur la face "sortie" du microfiltre (40) suivant un sens directement opposé au sens du courant de liquide à filtrer transportant ces particules alimentaires.Dishwasher according to claim 1, characterized in that the means for annihilating and slowing down the progression of these food particles at the inlet and in the meshes of the microfilter consist of one or more jets of liquid (45, 46 ) projected (s) by a watering reel (5) on the "outlet" face of the microfilter (40) in a direction directly opposite to the direction of the stream of liquid to be filtered transporting these food particles. Lave-vaisselle selon l'une ou l'autre des revendications 1 et 2, caractérisé en ce que les moyens de réglage de la pression du courant de liquide à filtrer au niveau du microfiltre (40) sont constitués par une valve de sécurité du type à ressort.Dishwasher according to either of Claims 1 and 2, characterized in that the means for adjusting the pressure of the stream of liquid to be filtered at the microfilter (40) consist of a safety valve of the type on springs. Lave-vaisselle selon 'une ou l'autre des revendications 1 et 2, caractérisé en ce que les moyens de réglage de la pression du courant de liquide à filtrer, au niveau du microfiltre (40) sont constitués par une hauteur H d'une colonne de liquide dans une canalisation de sécurité ou de délestage (28) du microfiltre (40).Dishwasher according to either of Claims 1 and 2, characterized in that the means for adjusting the pressure of the stream of liquid to be filtered, at the microfilter (40) consist of a height H of a column of liquid in a safety or load-shedding line (28) of the microfilter (40). Lave-vaisselle selon l'une ou l'autre des revendications 1 et 2, caractérisé en ce que les moyens de réglage de la pression du courant de liquide à filtrer au niveau du microfiltre (40) sont constitués par un injecteur du type venturi (50).Dishwasher according to either of Claims 1 and 2, characterized in that the means for adjusting the pressure of the stream of liquid to be filtered at the microfilter (40) consist of an injector of the venturi type ( 50). Lave-vaisselle selon l'une quelconque des revendications précédentes, caractérisé en ce que les jets de liquides (45, 46) sont projetés perpendiculairement sur la face " sortie" du microfiltre (40).Dishwasher according to any one of the preceding claims, characterized in that the liquid jets (45, 46) are projected perpendicularly on the "outlet" face of the microfilter (40). Lave-vaisselle selon l'une quelconque des revendications précédentes, caractérisé en ce que le microfiltre ayant une surface en arc de cercle est monté autour de l'axe de rotation du moulinet d'arrosage (5) et exposé aux jets de liquide constituant les premiers moyens.Dishwasher according to any one of the preceding claims, characterized in that the microfilter having a surface in an arc of a circle is mounted around the axis of rotation of the watering reel (5) and exposed to the jets of liquid constituting the first means. Lave-vaisselle selon l'une quelconque des revendications précédentes, caractérisé en ce que dans le microfiltre (40), à tout instant durant le lavage et le rinçage, au moins une maille ou un groupe de mailles est soumis(e) à l'action des jets de liquide constituant les premiers moyens.Dishwasher according to any one of the preceding claims, characterized in that in the microfilter (40), at any time during the washing and rinsing, at least one mesh or a group of meshes is subjected to the action of the liquid jets constituting the first means. Lave-vaisselle selon l'une quelconque des revendications précédentes, caractérisé en ce que dans le microfiltre, périodiquement durant le lavage et le rinçage, chaque maille ou groupe de mailles est soumis(e) pendant un temps minimum prédéterminé to à l'action des jets de liquide constituant les premiers moyens.Dishwasher according to any one of the preceding claims, characterized in that in the microfilter, periodically during washing and rinsing, each mesh or group of mesh is subjected for a minimum predetermined time to the action of liquid jets constituting the first means.
EP19920401352 1991-05-17 1992-05-18 Dishwasher with practically non-blockable microfilter Expired - Lifetime EP0514285B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9106014 1991-05-17
FR9106014A FR2676349B1 (en) 1991-05-17 1991-05-17 MICROFILTER DISHWASHER NEARLY CLOSABLE.

Publications (2)

Publication Number Publication Date
EP0514285A1 true EP0514285A1 (en) 1992-11-19
EP0514285B1 EP0514285B1 (en) 1995-10-18

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EP19920401352 Expired - Lifetime EP0514285B1 (en) 1991-05-17 1992-05-18 Dishwasher with practically non-blockable microfilter

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EP (1) EP0514285B1 (en)
DE (1) DE69205490T2 (en)
ES (1) ES2077993T3 (en)
FR (1) FR2676349B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101135855B1 (en) * 2004-12-07 2012-04-16 엘지전자 주식회사 A self drainage preventing structure of a dish washer
KR20060085782A (en) * 2005-01-25 2006-07-28 엘지전자 주식회사 A sump of dish washer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3491780A (en) * 1967-12-11 1970-01-27 Maytag Co Self-cleaning filter for dishwasher
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
EP0082592A1 (en) * 1981-11-09 1983-06-29 KITCHENAID, INC. (a Delaware corporation) Dishwasher

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4038103A (en) * 1976-07-27 1977-07-26 Hobart Corporation Dishwasher filter flushing system
FR2569973B1 (en) * 1984-09-11 1987-06-12 Esswein Sa LIQUID MICROFILTRING DISHWASHER

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3491780A (en) * 1967-12-11 1970-01-27 Maytag Co Self-cleaning filter for dishwasher
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
EP0082592A1 (en) * 1981-11-09 1983-06-29 KITCHENAID, INC. (a Delaware corporation) Dishwasher

Also Published As

Publication number Publication date
ES2077993T3 (en) 1995-12-01
DE69205490T2 (en) 1996-03-14
EP0514285B1 (en) 1995-10-18
FR2676349B1 (en) 1995-03-31
FR2676349A1 (en) 1992-11-20
DE69205490D1 (en) 1995-11-23

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