EP0076739B1 - Device for pumping liquid, and apparatus fitted with such a device - Google Patents

Device for pumping liquid, and apparatus fitted with such a device Download PDF

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Publication number
EP0076739B1
EP0076739B1 EP82401757A EP82401757A EP0076739B1 EP 0076739 B1 EP0076739 B1 EP 0076739B1 EP 82401757 A EP82401757 A EP 82401757A EP 82401757 A EP82401757 A EP 82401757A EP 0076739 B1 EP0076739 B1 EP 0076739B1
Authority
EP
European Patent Office
Prior art keywords
pump
impeller
air
air supply
blades
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82401757A
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German (de)
French (fr)
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EP0076739A1 (en
Inventor
Camille Barbier
Laurent Didier
Didier Viaud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Esswein SA
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Esswein SA
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Filing date
Publication date
Application filed by Esswein SA filed Critical Esswein SA
Priority to AT82401757T priority Critical patent/ATE13628T1/en
Publication of EP0076739A1 publication Critical patent/EP0076739A1/en
Application granted granted Critical
Publication of EP0076739B1 publication Critical patent/EP0076739B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/185—Rotors consisting of a plurality of wheels
    • 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
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4225—Arrangements or adaption of recirculation or discharge pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/12—Combinations of two or more pumps
    • 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
    • A47L15/4206—Tubular filters

Definitions

  • the present invention relates to a liquid pumping device and an apparatus such as a dishwasher provided with this pumping device.
  • An appliance such as a dishwasher usually has operating cycles which include different stages of treatment and corresponding baths. The end of each phase is often characterized by draining the water from the device.
  • the device's liquid pumping device thus comprises two pumps, a cycling pump giving energy to the water which exerts a mechanical action on the dishes and a drain pump. Most often, these pumps are driven by independent motors.
  • the pumping device comprises a single motor which on the other hand has two directions of rotation and on the shaft of which these two pumps are mounted or two stages of pumps one of which is intended for draining and the other is for cycling.
  • the cycling pump rotates in a predicted direction and the operation of the dishwasher is silent.
  • this cycling pump rotates in the opposite direction and the operation of the dishwasher becomes noisy.
  • a known solution consists in providing the latter with an air intake chimney which makes it possible to bring induced air at a point on the periphery of the turbine. the pump when this turbine rotates in the opposite direction to the direction of rotation during its cycling operation. This air intake allows the pump to slowly prime.
  • a solution similar to that above is also described in document US-A-3294102 where a dishwasher also includes two centrifugal type pumps driven by a motor with two directions of rotation, one serving as a cycling pump. and the other with a drain pump, the impeller of the cycling pump being provided with radial vanes delimited axially by an end flange.
  • the defusing of such a pump turns out to be too long and the part of the water which still remains in the pump is subjected to chopping by the blades of the turbine. This results in an unpleasant noise during this long defusing.
  • the present invention aims to avoid this drawback, allows for a liquid pumping device, economical, and silent regardless of the direction of rotation of its drive motor and an apparatus such as a dishwasher provided of such a pumping device.
  • a liquid pumping device having at least one centrifugal type pump driven by a motor with two directions of rotation, comprises, in this centrifugal pump on the one hand a wheel having main vanes oriented radially in one direction predetermined and axially delimited by at least one end flange, and auxiliary vanes produced on the external surface of this flange, and oriented radially in a direction opposite to that of these main blades, and on the other hand a intake chimney air coaxial with the pump impeller and having a first end, in communication with the interior of the body of this pump and being located near the auxiliary vanes of this impeller, and a second end emerging above the maximum level of liquid to be pumped, and open to air.
  • a dishwasher 1 produced according to the invention and illustrated in FIGS. 1 and 2 comprises, on the outside, a bodywork 2, and on the inside, a tank 3 in which dish baskets 4 and 5 are mainly mounted, spray reels 6 and 7 and a pumping device 8.
  • the pumping device 8 comprises at least one pump 9 intended for cycling the water which consists in sucking water 10 accumulated in the bottom of the tank 3 and in discharging it into the spraying reels 6 and 7.
  • the pumping device 8 further comprises a pump 11 intended for emptying the dishwasher 1, in other words the evacuation of water 10, and a motor 12 with two directions of rotation ensuring a drive of these two pumps whose wheels are fixed on a common shaft 13.
  • the pump 9 is a centrifugal type pump.
  • This pump 9 comprises a body 14, a impeller 15, an intake manifold 16, a supply line discharge 17 extended by hydraulic circuits from the dishwasher 1 to the spray reels 6 and 7, and according to an important characteristic of the invention, an air intake chimney 18, coaxial with the axis of rotation of the wheel 15 and having a first end in communication with the interior of the body 14 and a second end 19 emerging above the maximum level 20 of water in the tank 3 and open to air.
  • the wheel 15 comprises (FIG. 2) on the one hand main vanes 21 shown in broken lines in FIG.
  • auxiliary vanes 24 produced on the outer surface of the one of these flanges and oriented radially in a direction opposite to that of the main blades 21.
  • the wheel 15 is mounted with its auxiliary blades 24 facing the air intake chimney 18.
  • the pump 11 is a pump of the vane type which comprises a body 25 (FIG. 4) an intake opening 26 an intake pipe 27, a chamber 28 a vane wheel 29 which is fixed on the same shaft 13 as that of the wheel 15 of the centrifugal pump 9, a discharge pipe 30 and according to an important characteristic of the invention a non-return valve 31.
  • the intake opening 26 of the pump 11 and the intake manifold 16 of the pump 9 open into the same space 32 formed in the bottom of the tank 3 and which is located between the two pumps 9 and 11.
  • the common shaft 13 of the wheels 15 and 29 of the two pumps 9 and 11 is mounted through the space 32 and in alignment with the axis of the air intake chimney 18.
  • the water 10 from the dishwasher descends into the space 32 through a fixed filter 34, the removable well 35 forming an integral part of the filter 34 and the free spaces 33 being free for the passage of water.
  • the wheel 15 of the centrifugal pump 9 rotates in the direction provided for cycling the water 10 and the operation of the pump 9 is silent.
  • the water 10 is sucked into the intake manifold 16 and discharged through the line 17 into the reels 6 and 7.
  • the wheel 29 of the vane pump 11 rotates in a direction opposite to that provided for a emptying the dishwasher 1 while the non-return valve 31 prevents this pump 11 from sucking through its delivery pipe 30, air which can, for example, escape through the shaft passage hole 13 into the body of the pump 11, enter the space 32, enter the intake manifold 16 of the cycling pump 9 and seriously disturb the operation of the cycling pump 9. Thanks to its usual structure and despite this bad direction of rotation, the wheel 29 of the vane pump 11 does not induce more noise than when it turns in a good direction of rotation to perform a drain.
  • the pump 11 When the shaft 13 driven by the motor 12 rotates in the direction of arrow 37, the pump 11 sucks water 10 through its intake opening 26 and its intake pipe 27 and discharges it into its delivery pipe. discharge 30 through its non-return valve 31 which then turns on, to evacuate it towards the outside of the dishwasher while the pump 9 which rotates in a direction opposite to that provided for a cycling of the water 10 , also sucks water through its intake manifold 16 but discharges it into its pipe 17 with low pressure, low flow and normally an intolerable noise.
  • a pumping device 38 comprises, in addition, elements similar to those of the pumping device 8 of the first example and indicated by the same reference numbers, a channel 39 ensuring a connection between the end zone of the air intake chimney 18, which opens into the body 14 of the pump 9, and a hole 40 formed in the periphery of the upper wall of this body 14.
  • This channel 39 allows '' avoid an establishment, in the body 14 of the cycling pump 9, of a permanent air regime which causes difficulty in priming this pump 9, when starting this cycling pump 9, in a dishwasher without water, followed by filling the tank 3 of this dishwasher with water, during the operation of this pump 9.
  • a pumping device 48 comprises, in addition, elements similar to those of the pumping device 8 of the first example (FIG. 2) and indicated by the same reference numbers, a second chimney 49 having a first end in communication with the interior of the body 14 of the pump 9 and a second end or upper end, open outside of this pump 9, that is to say in the tank 3 of the example illustrated in FIG. 6, and at a predetermined level or height , lower than that of the end 19 of the air intake chimney 18.
  • This selected height of the second chimney 49 allows in a case of operation of the pump 9 from the start of filling with water from the tank 3, to cause priming of the pump 9 almost instantaneously when the level of this filling water reaches the upper end of this second chimney 49.
  • the priming of the pump 9 always occurs for a planned quantity of filling water in the tank 3, which makes it possible to avoid the formation of an air-water mixture in the pump 9 which generates a noisy operation thereof.
  • the body 14 of the pump 9 contains only air and the operation of the pump 9 only in the air is silent.
  • the filling water level rises in the tank 3 and exceeds the predetermined height of the second chimney 49, the entry of air into the body 14 of the pump 9 is greatly disturbed, and the water replaces very quickly to the air in this body 14 so that the formation of an air-water mixture is stopped from its birth, and the operation of the pump 9 remains silent.
  • the second chimney 49 is replaced by one or more holes drilled in the wall of the air intake chimney 18 at a chosen level or at different predetermined levels. This or these holes play the same function as that, described in a previous paragraph, of the second chimney 49, and allow silent operation of the pump 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Steroid Compounds (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

1. An apparatus for pumping liquids, comprising at least a centrifugal pump (9) including an impeller (15) having radial blades axially delimited by an end flange, said impeller being driven by a bidirectional motor (12), and including an air supply duct (18) in communication with the interior of the housing of said pump, characterised in that the impeller (15) carries main blades (21) which are radially oriented in a predetermined sense and axially delimited by at least one end flange (22, 23) and adapted to deliver the liquid upon rotation of the motor (12) in a predetermined sense, and the impeller is provided with auxiliary blades (24) which are formed on the outer surface of said flange (22) and are radially oriented in a sense opposite to that of the main blades (21) and adapted to supply air about the entire periphery of said impeller (15) to thereby rapidly drain the pump upon rotation of the motor (12) in an opposite direction, and characterised in that the air supply duct (18) is coaxial with the impeller (15) and has a first end which is in communication with the interior of the housing (14) of the pump (9) and is disposed on the side of the auxiliary blades (24) of the impeller (15), and has a second end (19) which extends upwardly beyond the maximum level of the pumped liquid and is open to the air.

Description

La présente invention concerne un dispositif de pompage de liquide et un appareil tel qu'un lave-vaisselle muni de ce dispositif de pompage.The present invention relates to a liquid pumping device and an apparatus such as a dishwasher provided with this pumping device.

Un appareil tel qu'un lave-vaisselle a habituellement des cycles de fonctionnement qui comprennent différentes phases de traitement et des bains correspondants. La fin de chaque phase est souvent caractérisée par une vidange de l'eau de l'appareil. Le dispositif de pompage de liquide de l'appareil comprend ainsi deux pompes, une pompe de cyclage donnant de l'énergie à l'eau qui exerce une action mécanique sur la vaisselle et une pompe de vidange. Le plus souvent, ces pompes sont entraînées par des moteurs indépendants.An appliance such as a dishwasher usually has operating cycles which include different stages of treatment and corresponding baths. The end of each phase is often characterized by draining the water from the device. The device's liquid pumping device thus comprises two pumps, a cycling pump giving energy to the water which exerts a mechanical action on the dishes and a drain pump. Most often, these pumps are driven by independent motors.

Dans d'autres lave-vaisselles, le dispositif de pompage comprend un seul moteur qui a par contre deux sens de rotation et sur l'arbre duquel sont montées ces deux pompes ou deux étages de pompes dont l'une est destinée à la vidange et l'autre est destinée au cyclage.In other dishwashers, the pumping device comprises a single motor which on the other hand has two directions of rotation and on the shaft of which these two pumps are mounted or two stages of pumps one of which is intended for draining and the other is for cycling.

Durant le cyclage de l'eau, la pompe de cyclage tourne dans un sens prévu et le fonctionnement du lave-vaisselle est silencieux. Pendant la vidange, cette pompe de cyclage tourne dans un sens opposé et le fonctionnement du lave-vaisselle devient bruyant.During the cycling of the water, the cycling pump rotates in a predicted direction and the operation of the dishwasher is silent. During draining, this cycling pump rotates in the opposite direction and the operation of the dishwasher becomes noisy.

Pour atténuer ce bruit de fonctionnement de la pompe de cyclage, une solution connue consiste à pourvoir celle-ci d'une cheminée de prise d'air qui permet d'amener de l'air induit en un point de la périphérie de la turbine de la pompe lorsque cette turbine tourne dans le sens opposé au sens de rotation durant son fonctionnement de cyclage. Cette arrivée d'air permet à la pompe de se désamorcer lentement. Une solution analogue à celle ci-dessus est également décrite dans le document US-A-3294102 où un lave-vaisselle' comprend aussi deux pompes de type centrifuge entraînées par un moteur à deux sens de rotation, l'une servant de pompe de cyclage et l'autre de pompe de vidange, la turbine de la pompe de cyclage étant pourvue d'aubes radiales délimitées axialement par un flasque d'extrémité. Cependant le désamorçage d'une telle pompe s'avère trop long et la partie de l'eau qui séjourne encore dans la pompe est soumise au hachage par les aubes de la turbine. Il en résulte un bruit désagréable durant ce long désamorçage.To reduce this operating noise of the cycling pump, a known solution consists in providing the latter with an air intake chimney which makes it possible to bring induced air at a point on the periphery of the turbine. the pump when this turbine rotates in the opposite direction to the direction of rotation during its cycling operation. This air intake allows the pump to slowly prime. A solution similar to that above is also described in document US-A-3294102 where a dishwasher also includes two centrifugal type pumps driven by a motor with two directions of rotation, one serving as a cycling pump. and the other with a drain pump, the impeller of the cycling pump being provided with radial vanes delimited axially by an end flange. However, the defusing of such a pump turns out to be too long and the part of the water which still remains in the pump is subjected to chopping by the blades of the turbine. This results in an unpleasant noise during this long defusing.

En outre dans la construction selon cette solution, le désamorçage de la pompe se produit d'une façon aléatoire.In addition, in the construction according to this solution, the defusing of the pump occurs randomly.

La présente invention ayant pour but d'éviter cet inconvénient, permet de réaliser un dispositif de pompage de liquide, économique, et silencieux quel que soit le sens de rotation de son moteur d'entraînement et un appareil tel qu'un lave-vaisselle muni d'un tel dispositif de pompage.The present invention aims to avoid this drawback, allows for a liquid pumping device, economical, and silent regardless of the direction of rotation of its drive motor and an apparatus such as a dishwasher provided of such a pumping device.

Selon l'invention, un dispositif de pompage de liquide ayant au moins une pompe de type centrifuge entraînée par un moteur à deux sens de rotation, comprend, dans cette pompe centrifuge d'une part une roue ayant des aubes principales orientées radialement dans un sens prédéterminé et délimitées axialement par au moins un flasque d'extrémité, et des aubes auxiliaires réalisées sur la surface extérieure de ce flasque, et orientées radialement dans un sens opposé à celui de ces aubes principales, et d'autre part une cheminée de prise d'air coaxiale avec la roue de la pompe et ayant une première extrémité, en communication avec l'intérieur du corps de cette pompe et se trouvant à proximité des aubes auxiliaires de cette roue, et une deuxième extrémité émergeant au-dessus du niveau maximal de liquide à pomper, et ouverte à l'air.According to the invention, a liquid pumping device having at least one centrifugal type pump driven by a motor with two directions of rotation, comprises, in this centrifugal pump on the one hand a wheel having main vanes oriented radially in one direction predetermined and axially delimited by at least one end flange, and auxiliary vanes produced on the external surface of this flange, and oriented radially in a direction opposite to that of these main blades, and on the other hand a intake chimney air coaxial with the pump impeller and having a first end, in communication with the interior of the body of this pump and being located near the auxiliary vanes of this impeller, and a second end emerging above the maximum level of liquid to be pumped, and open to air.

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

  • la figure 1 représente une vue en perspective, schématique et partielle d'un lave-vaisselle réalisé selon l'invention,
  • la figure 2 représente à une autre échelle une vue schématique en coupe verticale de la partie inférieure de la cuve du lave-vaisselle de la figure 1, montrant un dispositif de pompage de liquide selon un premier exemple de réalisation de l'invention,
  • la figure 3 représente à une autre échelle une vue de dessus de la roue de la pompe centrifuge du dispositif de pompage de la figure 2,
  • la figure 4 représente à une autre échelle, une vue, en coupe suivant le plan IV-IV, de la figure 2 montrant la pompe de vidange du dispositif de pompage,
  • la figure 5 représente une vue d'un deuxième exemple de réalisation du dispositif de pompage de l'invention, et
  • la figure 6 représente une vue d'un troisième exemple de réalisation du dispositif de pompage de l'invention.
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 perspective view of a dishwasher produced according to the invention,
  • FIG. 2 represents on another scale a schematic view in vertical section of the lower part of the tank of the dishwasher of FIG. 1, showing a device for pumping liquid according to a first embodiment of the invention,
  • FIG. 3 shows on another scale a top view of the impeller of the centrifugal pump of the pumping device of FIG. 2,
  • FIG. 4 represents, on another scale, a view, in section along the plane IV-IV, of FIG. 2 showing the drain pump of the pumping device,
  • FIG. 5 represents a view of a second embodiment of the pumping device of the invention, and
  • Figure 6 shows a view of a third embodiment of the pumping device of the invention.

Un lave-vaisselle 1 réalisé selon l'invention et illustré dans les figures 1 et 2 comprend à l'extérieur, une carosserie 2, et à l'intérieur, une cuve 3 dans laquelle sont principalement montés des paniers à vaisselle 4 et 5, des moulinets d'aspersion 6 et 7 et un dispositif de pompage 8.A dishwasher 1 produced according to the invention and illustrated in FIGS. 1 and 2 comprises, on the outside, a bodywork 2, and on the inside, a tank 3 in which dish baskets 4 and 5 are mainly mounted, spray reels 6 and 7 and a pumping device 8.

Le dispositif de pompage 8 comprend au moins une pompe 9 destinée au cyclage de l'eau lequel consiste à aspirer de l'eau 10 accumulée dans le fond de la cuve 3 et à la refouler dans les moulinets d'aspersion 6 et 7. Dans un premier exemple illustré dans la figure 2, le dispositif de pompage 8 comprend en outre, une pompe 11 destinée à la vidange du lave-vaisselle 1, autrement dit l'évacuation de l'eau 10, et un moteur 12 à deux sens de rotation assurant un entraînement de ces deux pompes dont les roues sont fixées sur un arbre commun 13.The pumping device 8 comprises at least one pump 9 intended for cycling the water which consists in sucking water 10 accumulated in the bottom of the tank 3 and in discharging it into the spraying reels 6 and 7. In a first example illustrated in FIG. 2, the pumping device 8 further comprises a pump 11 intended for emptying the dishwasher 1, in other words the evacuation of water 10, and a motor 12 with two directions of rotation ensuring a drive of these two pumps whose wheels are fixed on a common shaft 13.

La pompe 9 est une pompe du type centrifuge. Cette pompe 9 comprend un corps 14, une roue 15, une tubulure d'admission 16, une conduite de refoulement 17 prolongée par des circuits hydrauliques du lave-vaisselle 1 jusqu'aux moulinets d'aspersion 6 et 7, et selon une caractéristique importante de l'invention, une cheminée de prise d'air 18, coaxiale avec l'axe de rotation de la roue 15 et ayant une première extrémité en communication avec l'intérieur du corps 14 et une deuxième extrémité 19 émergeant au-dessus du niveau maximal 20 d'eau dans la cuve 3 et ouverte à l'air. La roue 15 comprend (figure 2) d'une part des aubes principales 21 représentées en traits discontinus dans la figure 3, orientées radialement dans un sens prédéterminé et délimitées par au moins un flasque d'extrémité, ces flasques étant deux (22, 23) dans l'exemple illustré, parallèles entre eux et perpendiculaires à l'axe de rotation de la roue 15, et d'autre part selon une autre caractéristique importante de l'invention, des aubes auxiliaires 24, réalisées sur la surface extérieure de l'un 22 de ces flasques et orientées radialement dans un sens opposé à celui des aubes principales 21. Dans la pompe centrifuge 9, la roue 15 est montée avec ses aubes auxiliaires 24 faisant face à la cheminée de prise d'air 18.The pump 9 is a centrifugal type pump. This pump 9 comprises a body 14, a impeller 15, an intake manifold 16, a supply line discharge 17 extended by hydraulic circuits from the dishwasher 1 to the spray reels 6 and 7, and according to an important characteristic of the invention, an air intake chimney 18, coaxial with the axis of rotation of the wheel 15 and having a first end in communication with the interior of the body 14 and a second end 19 emerging above the maximum level 20 of water in the tank 3 and open to air. The wheel 15 comprises (FIG. 2) on the one hand main vanes 21 shown in broken lines in FIG. 3, oriented radially in a predetermined direction and delimited by at least one end flange, these flanges being two (22, 23 ) in the example illustrated, parallel to each other and perpendicular to the axis of rotation of the wheel 15, and on the other hand according to another important characteristic of the invention, auxiliary vanes 24, produced on the outer surface of the one of these flanges and oriented radially in a direction opposite to that of the main blades 21. In the centrifugal pump 9, the wheel 15 is mounted with its auxiliary blades 24 facing the air intake chimney 18.

Dans l'exemple illustré (figure 2), la pompe 11 est une pompe du type à palettes qui comprend un corps 25 (figure 4) une ouverture d'admission 26 une conduite d'admission 27, une chambre 28 une roue à palettes 29 qui est fixée sur le même arbre 13 que celui de la roue 15 de la pompe centrifuge 9, une conduite de refoulement 30 et selon une caractéristique importante de l'invention un clapet anti-retour 31.In the example illustrated (FIG. 2), the pump 11 is a pump of the vane type which comprises a body 25 (FIG. 4) an intake opening 26 an intake pipe 27, a chamber 28 a vane wheel 29 which is fixed on the same shaft 13 as that of the wheel 15 of the centrifugal pump 9, a discharge pipe 30 and according to an important characteristic of the invention a non-return valve 31.

L'ouverture d'admission 26 de la pompe 11 et la tubulure d'admission 16 de la pompe 9 débouchent dans un même espace 32 formé dans le fond de la cuve 3 et qui se situe entre les deux pompes 9 et 11. L'arbre commun 13 des roues 15 et 29 des deux pompes 9 et 11 est monté à travers l'espace 32 et dans l'alignement de l'axe de la cheminée de prise d'air 18.The intake opening 26 of the pump 11 and the intake manifold 16 of the pump 9 open into the same space 32 formed in the bottom of the tank 3 and which is located between the two pumps 9 and 11. The common shaft 13 of the wheels 15 and 29 of the two pumps 9 and 11 is mounted through the space 32 and in alignment with the axis of the air intake chimney 18.

L'eau 10 du lave-vaisselle descend dans l'espace 32 à travers un filtre fixe 34, le puits amovible 35 faisant partie intégrante du filtre 34 et les espaces libres 33 étant libres au passage de l'eau.The water 10 from the dishwasher descends into the space 32 through a fixed filter 34, the removable well 35 forming an integral part of the filter 34 and the free spaces 33 being free for the passage of water.

Quand l'arbre 13 entraîné par le moteur 12 tourne dans le sens de la flèche 36, la roue 15 de la pompe centrifuge 9 tourne dans le sens prévu pour un cyclage de l'eau 10 et le fonctionnement de la pompe 9 est silencieux. L'eau 10 est aspirée dans la tubulure d'admissions 16 et refoulée à travers la conduite 17 dans les moulinets 6 et 7. Pendant ce temps, la roue 29 de la pompe à palette 11 tourne dans un sens contraire à celui prévu pour une vidange du lave-vaisselle 1 tandis que le clapet anti-retour 31 empêche cette pompe 11 d'aspirer à travers sa conduite de refoulement 30, de l'air qui peut par exemple s'échapper par le trou de passage de l'arbre 13 dans le corps de la pompe 11, entrer dans l'espace 32, pénétrer dans la tubulure d'admission 16 de la pompe de cyclage 9 et perturber gravement le fonctionnement de la pompe de cyclage 9. Grâce à sa structure habituelle et malgré ce mauvais sens de rotation, la roue 29 de la pompe à palette 11 n'induit pas plus de bruit que quand elle tourne dans un bon sens de rotation pour effectuer une vidange.When the shaft 13 driven by the motor 12 rotates in the direction of arrow 36, the wheel 15 of the centrifugal pump 9 rotates in the direction provided for cycling the water 10 and the operation of the pump 9 is silent. The water 10 is sucked into the intake manifold 16 and discharged through the line 17 into the reels 6 and 7. Meanwhile, the wheel 29 of the vane pump 11 rotates in a direction opposite to that provided for a emptying the dishwasher 1 while the non-return valve 31 prevents this pump 11 from sucking through its delivery pipe 30, air which can, for example, escape through the shaft passage hole 13 into the body of the pump 11, enter the space 32, enter the intake manifold 16 of the cycling pump 9 and seriously disturb the operation of the cycling pump 9. Thanks to its usual structure and despite this bad direction of rotation, the wheel 29 of the vane pump 11 does not induce more noise than when it turns in a good direction of rotation to perform a drain.

Quand l'arbre 13 entraîné par le moteur 12 tourne dans le sens de la flèche 37, la pompe 11 aspire de l'eau 10 à travers son ouverture d'admission 26 et sa conduite d'admission 27 et la refoule dans sa conduite de refoulement 30 au travers de son clapet anti-retour 31 qui devient alors passant, pour l'évacuer vers l'extérieur du lave-vaisselle tandis que la pompe 9 qui tourne dans un sens opposé à celui prévu pour un cyclage de l'eau 10, aspire aussi de l'eau par sa tubulure d'admission 16 mais la refoule dans sa conduite 17 avec une faible pression, un faible débit et normalement un bruit intolérable.When the shaft 13 driven by the motor 12 rotates in the direction of arrow 37, the pump 11 sucks water 10 through its intake opening 26 and its intake pipe 27 and discharges it into its delivery pipe. discharge 30 through its non-return valve 31 which then turns on, to evacuate it towards the outside of the dishwasher while the pump 9 which rotates in a direction opposite to that provided for a cycling of the water 10 , also sucks water through its intake manifold 16 but discharges it into its pipe 17 with low pressure, low flow and normally an intolerable noise.

En effet, dans un tel sens de rotation, les aubes principales 21 de la roue 15 de la pompe 9 cisaillent l'eau 10 et devraient provoquer un intense phénomène de cavitation qui engendre un important bruit. Cependant, dans la pompe centrifuge 9 réalisée selon l'invention, un tel bruit ne se produit pas. En effet quand la roue 15 tourne dans le sens de la flèche 37, ses aubes auxiliaires 24 centrifugent l'eau 10 qui se trouve dans la partie au-dessus du flasque 22 et créant une dépression dans la partie basse de la cheminée de prise d'air 18. L'air appelé par cette dépression, entrant dans le,corps 14 de la pompe 9 par cette cheminée 18 est centrifugé par des aubes auxiliaires 24 vers toute la périphérie de la roue 15. L'arrivée de l'air sur tous les points de la périphérie de la roue 15 provoque un désamorçage quasi instantané de la pompe 9. Les aubes principales 21 de la roue 15 de la pompe 9 ne sont plus alors en contact avec de l'eau 10 mais de l'air ainsi appelé. Le phénomène de cavitation et le grand bruit qui devrait en résulter s'évanouissent ainsi dès leur naissance, et par conséquent, le fonctionnement de la pompe 9 reste silencieux même dans le cas où sa roue 15 tourne dans un sens opposé à celui prévu pour un cyclage de l'eau.Indeed, in such a direction of rotation, the main vanes 21 of the wheel 15 of the pump 9 shear the water 10 and should cause an intense cavitation phenomenon which generates a significant noise. However, in the centrifugal pump 9 produced according to the invention, such noise does not occur. When the wheel 15 turns in the direction of arrow 37, its auxiliary vanes 24 centrifuge the water 10 which is in the part above the flange 22 and creating a depression in the lower part of the intake chimney. 'Air 18. The air drawn by this depression, entering the body 14 of the pump 9 through this chimney 18 is centrifuged by auxiliary vanes 24 towards the entire periphery of the wheel 15. The arrival of air on all the points of the periphery of the wheel 15 causes an almost instantaneous defusing of the pump 9. The main blades 21 of the wheel 15 of the pump 9 are no longer in contact with water 10 but air thus called. The cavitation phenomenon and the great noise which should result therefrom thus vanish from their birth, and consequently, the operation of the pump 9 remains silent even in the case where its wheel 15 rotates in a direction opposite to that provided for a water cycling.

Selon un deuxième exemple de réalisation, illustré dans la figure 5, un dispositif de pompage 38 comprend, en plus, des éléments analogues à ceux du dispositif de pompage 8 du premier exemple et indiqués par les mêmes numéros de référence, un canal 39 assurant une liaison entre la zone d'extrémité de la cheminée de prise d'air 18, qui débouche dans le corps 14 de la pompe 9, et un trou 40 formé dans la périphérie de la paroi supérieure de ce corps 14. Ce canal 39 permet d'éviter un établissement, dans le corps 14 de la pompe de cyclage 9, d'un régime permanent d'air qui provoque une difficulté d'amorçage de cette pompe 9, lors d'un démarrage de cette pompe de cyclage 9, dans un lave-vaisselle sans eau, suivi d'un remplissage en eau de la cuve 3 de ce lave-vaisselle, durant le fonctionnement de cette pompe 9.According to a second exemplary embodiment, illustrated in FIG. 5, a pumping device 38 comprises, in addition, elements similar to those of the pumping device 8 of the first example and indicated by the same reference numbers, a channel 39 ensuring a connection between the end zone of the air intake chimney 18, which opens into the body 14 of the pump 9, and a hole 40 formed in the periphery of the upper wall of this body 14. This channel 39 allows '' avoid an establishment, in the body 14 of the cycling pump 9, of a permanent air regime which causes difficulty in priming this pump 9, when starting this cycling pump 9, in a dishwasher without water, followed by filling the tank 3 of this dishwasher with water, during the operation of this pump 9.

Selon un troisième exemple de réalisation, illustré dans la figure 6, un dispositif de pompage 48 comprend, en plus, des éléments analogues à ceux du dispositif de pompage 8 du premier exemple (figure 2) et indiqués par les mêmes numéros de référence, une deuxième cheminée 49 ayant une première extrémité en communication avec l'intérieur du corps 14 de la pompe 9 et une deuxième extrémité ou extrémité supérieure, ouverte à l'extérieur de cette pompe 9, c'est-à-dire dans la cuve 3 de l'exemple illustré dans la figure 6, et à un niveau ou hauteur, prédéterminé, inférieur à celui de l'extrémité 19 de la cheminée de prise d'air 18. Cette hauteur choisie de la deuxième cheminée 49 permet dans un cas d'un fonctionnement de la pompe 9 dès le début d'un remplissage en eau de la cuve 3, de provoquer un amorçage de la pompe 9 de manière presque instantanée au moment où le niveau de cette eau de remplissage atteint l'extrémité supérieure de cette deuxième cheminée 49.According to a third exemplary embodiment, illustrated in FIG. 6, a pumping device 48 comprises, in addition, elements similar to those of the pumping device 8 of the first example (FIG. 2) and indicated by the same reference numbers, a second chimney 49 having a first end in communication with the interior of the body 14 of the pump 9 and a second end or upper end, open outside of this pump 9, that is to say in the tank 3 of the example illustrated in FIG. 6, and at a predetermined level or height , lower than that of the end 19 of the air intake chimney 18. This selected height of the second chimney 49 allows in a case of operation of the pump 9 from the start of filling with water from the tank 3, to cause priming of the pump 9 almost instantaneously when the level of this filling water reaches the upper end of this second chimney 49.

Il en résulte que l'amorçage de la pompe 9 se produit toujours pour une quantité prévue d'eau de remplissage dans la cuve 3, ce qui permet d'éviter une formation d'un mélange air-eau dans la pompe 9 qui engendre un fonctionnement bruyant de celle-ci. En effet au début d'un remplissage en eau de la cuve 3 avec la pompe 9 tournant, le corps 14 de la pompe 9 ne contient que de l'air et le fonctionnement de la pompe 9 uniquement dans l'air est silencieux. Quand le niveau d'eau de remplissage monte dans la cuve 3 et dépasse la hauteur prédéterminée de la deuxième cheminée 49, l'entrée d'air dans le corps 14 de la pompe 9 est fortement perturbée, et l'eau se substitue très rapidement à l'air dans ce corps 14 de manière que la formation d'un mélange air-eau est arrêtée dès sa naissance, et le fonctionnement de la pompe 9 reste silencieux.As a result, the priming of the pump 9 always occurs for a planned quantity of filling water in the tank 3, which makes it possible to avoid the formation of an air-water mixture in the pump 9 which generates a noisy operation thereof. In fact, at the start of filling the tank 3 with water with the pump 9 rotating, the body 14 of the pump 9 contains only air and the operation of the pump 9 only in the air is silent. When the filling water level rises in the tank 3 and exceeds the predetermined height of the second chimney 49, the entry of air into the body 14 of the pump 9 is greatly disturbed, and the water replaces very quickly to the air in this body 14 so that the formation of an air-water mixture is stopped from its birth, and the operation of the pump 9 remains silent.

Dans une variante de réalisation non illustrée, la deuxième cheminée 49 est remplacée par un ou plusieurs trous percés dans la paroi de la cheminée de prise d'air 18 à un niveau choisi ou à' des niveaux différents prédéterminés. Ce ou ces trous jouent la même fonction que celle, décrite dans un paragraphe précédent, de la deuxième cheminée 49, et permettent un fonctionnement silencieux de la pompe 9.In an alternative embodiment not shown, the second chimney 49 is replaced by one or more holes drilled in the wall of the air intake chimney 18 at a chosen level or at different predetermined levels. This or these holes play the same function as that, described in a previous paragraph, of the second chimney 49, and allow silent operation of the pump 9.

Claims (8)

1. An apparatus for pumping liquids, comprising at least a centrifugal pump (9) including an impeller (15) having radial blades axially delimited by an end flange, said impeller being driven by a bidirectional motor (12), and including an air supply duct (18) in communication with the interior of the housing of said pump, characterised in that the impeller (15) carries main blades (21) which are radially oriented in a predetermined sense and axially delimited by at least one end flange (22, 23) and adapted to deliver the liquid upon rotation of the motor (12) in a predetermined sense, and the impeller is provided with auxiliary blades (24) which are formed on the outer surface of said flange (22) and are radially oriented in a sense opposite to that of the main blades (21) and adapted to supply air about the entire periphery of said impeller (15) to thereby rapidly drain the pump upon rotation of the motor (12) in an opposite direction, and characterised in that the air supply. duct (18) is coaxial with the impeller (15) and has a first end which is in communication with the interior of the housing (14) of the pump (9) and is disposed on the side of the auxiliary blades (24) of the impeller (15), and has a second end (19) which extends upwardly beyond the maximum level of the pumped liquid and is open to the air.
2. An apparatus as claimed in claim 1, comprising a second pump (11) whose impeller (29) is mounted on the same shaft (13) as the impeller (15) of the first pump (9), said shaft (13) being mounted such that it passes through a space (32) intermediate said two pumps (9, 11) in which the intake conduit (16) of the centrifugal pump (9) terminates, characterised in that said apparatus comprises as said second pump a vane-type pump (11) which is provided, on the one hand, with an intake port (26) opening into said space (32) intermediate said two pumps (9, 11) and, on the other hand, with a delivery conduit (30) including a non-return valve (31) which prevents the pump (11) from taking in air that might escape and enter the pump (9) to interfere with the operation thereof.
3. An apparatus as claimed in claim 1, characterised in that it comprises in the centrifugal pump (9) an impeller (15) whose main blades (21) are delimited at the ends thereof by two flanges that are parallel to each other and perpendicular to the axis of rotation of said impeller (15).
4. An apparatus as claimed in any of the claims 1 to 3, characterised in that it is provided at the level of the centrifugal pump (9) with a passage (39) which establishes communication between the end zone of the air supply duct (18) opening into the housing (14) of said centrifugal pump (9) and a hole (40) formed in the periphery of the top wall of the housing (14) of said pump (9).
5. An apparatus as claimed in any of the claims 1 to 3, characterised in that it is provided with a second duct (49) which has a first end in communication with the interior of the housing (14) of the pump (9) and a second end open to the environment of said pump (9) at a predetermined level or height below the level of the air supply duct (18).
6. An apparatus as claimed in any of the claims 1 to 3, characterised in that it is provided in the wall of the air supply duct (18) with one or several holes that are drilled at a selected level.
7. An apparatus as claimed in any of the claims 1 to 3, characterised in that it is provided in the wall of the air supply duct (18) with a plurality of holes which are drilled at different predetermined levels.
8. Use of the pumping apparatus (8) as claimed in any of the claims 1 to 7 in an appliance such as a dish washing machine, characterised in that in said appliance the centrifugal pump (9) of the pumping apparatus (8, 38, 48) serves as circulating pump for the water (10) and the vanetype pump (11) serves as drain pump for the appliance.
EP82401757A 1981-10-02 1982-09-28 Device for pumping liquid, and apparatus fitted with such a device Expired EP0076739B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82401757T ATE13628T1 (en) 1981-10-02 1982-09-28 DEVICE FOR PUMPING A LIQUID AND MACHINE FITTED WITH SUCH DEVICE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8118640 1981-10-02
FR8118640A FR2514082B1 (en) 1981-10-02 1981-10-02 LIQUID PUMPING DEVICE AND APPARATUS PROVIDED WITH SUCH A DEVICE

Publications (2)

Publication Number Publication Date
EP0076739A1 EP0076739A1 (en) 1983-04-13
EP0076739B1 true EP0076739B1 (en) 1985-06-05

Family

ID=9262710

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401757A Expired EP0076739B1 (en) 1981-10-02 1982-09-28 Device for pumping liquid, and apparatus fitted with such a device

Country Status (5)

Country Link
EP (1) EP0076739B1 (en)
AT (1) ATE13628T1 (en)
DE (1) DE3264062D1 (en)
DK (1) DK429982A (en)
FR (1) FR2514082B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1201783B (en) * 1986-11-27 1989-02-02 Zanussi Elettrodomestici PUMPING GROUP IN PARTICULAR FOR DISHWASHER MACHINES
DK1334689T3 (en) * 1991-12-20 2006-09-25 Fisher & Paykel Appliances Ltd dishwasher
EP1973459B1 (en) * 2005-12-09 2020-09-09 LG Electronics Inc. Dish washer

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3294102A (en) * 1964-12-09 1966-12-27 Whirlpool Co Dishwashing apparatus having improved pump means
DE1933672A1 (en) * 1969-07-02 1971-01-14 Moczala Dr Ing Helmut Motor-pump unit
AT323367B (en) * 1972-07-31 1975-07-10 Bosch Hausgeraete Gmbh DISHWASHER WITH A PUMP COMBINATION
US3973866A (en) * 1975-01-02 1976-08-10 Vaughan Co., Inc. Centrifugal chopping slurry pump

Also Published As

Publication number Publication date
FR2514082B1 (en) 1985-12-06
EP0076739A1 (en) 1983-04-13
ATE13628T1 (en) 1985-06-15
FR2514082A1 (en) 1983-04-08
DK429982A (en) 1983-04-03
DE3264062D1 (en) 1985-07-11

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