EP0150147A2 - Geschirrspüler mit Mikrofilter - Google Patents

Geschirrspüler mit Mikrofilter Download PDF

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Publication number
EP0150147A2
EP0150147A2 EP85400054A EP85400054A EP0150147A2 EP 0150147 A2 EP0150147 A2 EP 0150147A2 EP 85400054 A EP85400054 A EP 85400054A EP 85400054 A EP85400054 A EP 85400054A EP 0150147 A2 EP0150147 A2 EP 0150147A2
Authority
EP
European Patent Office
Prior art keywords
liquid
pump
filter
microfilter
tank
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.)
Granted
Application number
EP85400054A
Other languages
English (en)
French (fr)
Other versions
EP0150147B1 (de
EP0150147A3 (en
Inventor
Laurent Didier
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
Original Assignee
Esswein SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Esswein SA filed Critical Esswein SA
Publication of EP0150147A2 publication Critical patent/EP0150147A2/de
Publication of EP0150147A3 publication Critical patent/EP0150147A3/fr
Application granted granted Critical
Publication of EP0150147B1 publication Critical patent/EP0150147B1/de
Expired legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4202—Water filter means or strainers
    • A47L15/4208—Arrangements to prevent clogging of the filters, e.g. self-cleaning
    • 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
    • A47L15/4204—Flat filters

Definitions

  • the present invention relates to a liquid microfiltration dishwasher.
  • a dishwasher usually includes a filter designed to separate the waste removed from the dishes, the washing and rinsing liquid of the latter.
  • This filter is often placed in the tank of the machine, between the underside of the lowest spray arm and the inlet of the spray or rinsing liquid recycling pump.
  • the washing or rinsing liquid falling from the dish baskets passes through this filter under the effect of gravity before reaching the inlet of this watering or recycling liquid pump and the majority of the waste being in this liquid is retained by this filter.
  • the filtered liquid is again discharged by this sprinkler or recycling pump, into the spray arms of the machine and projected onto the dishes in the dish baskets to clean them, and a new cycle of circulation of the liquid begins again.
  • the liquid is evacuated by a drain pump.
  • known dishwashers make it possible to obtain clean dishes in each of their operating programs with a relatively large predetermined quantity of water admitted for the washing and rinsing phases.
  • the present invention provides a solution to the problem identified above and relating to micro-waste in the dishwasher.
  • a dishwasher having in its tank, a recycling pump and a drain pump driven by the same electric motor and filtering and microfiltration devices for large, medium and micro-waste is characterized in that it includes in combination in the first place a pump recycling and a drain pump driven by the same electric motor rotating in both directions of rotation, the drain pump being provided with a non-return valve on its discharge line; secondly, a medium filter separating from the rest of the tank, the two recycling and draining pumps arranged in the bottom of this tank, and thirdly a microfilter, which create during the washing and rinsing of the dishes, by the recycling pump a stream of liquid through the medium filter to rid it of large and medium waste, and by the drain pump, a stream of liquid already filtered by this medium filter, through the microfilter to rid it of micro-waste, and during the emptying, an evacuation of the liquid from the tank by the emptying pump rotating in the opposite direction to that allowing the microfiltration.
  • 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, sprinklers 6 and 7, a pumping device 8, on the one hand means carrying out a standard simultaneous filtering of all the liquid to rid it of large and medium waste and on the other hand means carrying out a micro progressive filtration of this liquid to get rid of micro-waste or small waste.
  • the pumping device 8 comprises in the example illustrated on the one hand a pump 10 intended for recycling of liquid which consists in sucking up liquid accumulated in the bottom of the tank 3 and in discharging it into the sprinkler reels 6 and 7 which spray liquid on the dishes to clean or rinse them and on the other hand a pump 11 intended for the emptying of the dishwasher 1, in other words the evacuation of the liquid and a motor 12 with two directions of rotation ensuring a drive of these two pumps, the wheels of which are fixed to a common shaft 13.
  • the recycling pump is a centrifugal type pump.
  • This pump 10 comprises a body 14, a impeller 15, an inlet opening 16 and a discharge line 17 extended by hydraulic circuits from the dishwasher 1 to the sprinkler reels 6 and 7.
  • the drain pump 11 is a vane type pump which comprises a body 18, an intake opening 19, an intake pipe 20, a chamber 21, a vane wheel 22 which is fixed on the same shaft 13 as that of the wheel 15 of the centrifugal pump, a discharge line 23 and a non-return valve 24.
  • the intake opening 19 of the drain pump 11 and the intake manifold 16 of the pump 10 open into the same space 25 formed in the lowest part of the bottom of the tank 3 and which is located between the two pumps 10 and 1I.
  • the common shaft 13 of the wheels 15 and 22 of the two pumps 10 and 11 is mounted through this space 25.
  • the wheels 15 and 22 of the two pumps may have independent shafts and be driven by independent motors rotating in both directions, not shown, or the two pumps 10 and 11 may be equivalent pumps of another known type than those described above, without departing from the scope of the present invention.
  • the means carrying out a standard filtering of the liquid and the means carrying out a microfiltration are constituted by a device for filtering 9 of liquid which comprises at least two independent filters, one of which is a medium filter carrying out a standard filtering which rids or separates this liquid, of large and medium waste and the other a microfilter serving to rid or separate the liquid from the maximum micro-waste or small size waste that has passed through the medium filter.
  • the means carrying out standard filtering can comprise either a medium filter or a coarse filter for ridding or separating this liquid from large waste and a medium filter for ridding or separating this liquid from large and medium waste.
  • a coarse filter is a filter having large meshes of the order of 5 millimeters
  • a medium filter is a filter having medium meshes of the order of one millimeter
  • a microfilter is a filter having fine meshes of the order of a few tenths of a millimeter, for example two tenths of a millimeter.
  • the microfilter is placed in communication with the drain pump through a fraction of the surface of the intake opening thereof. It follows that the entry of liquid into the drain pump 11 takes place both through the intake opening of this pump, through the microfilter and through the passage opening for the shaft of this pump.
  • microfiltration is intended for filtering liquid which is already subjected to filtering with a medium filter.
  • liquid stream passing through the medium filter is preferably created by the recycling pump while the liquid stream passing through the microfilter is preferably created by the drain pump.
  • the filtering device 9 comprises a medium filter 26, a coarse filter 28 and a microfilter 29.
  • the filtering device 9 is mounted in the lower part of the tank 3 under the reel lower watering hose or the lower reel 6 to completely separate the two pumps 10 and 11 from the rest of the tank 3 and the washing or rinsing liquid that has fallen from the dishes, so that during washing and rinsing everything the liquid in the tank can only be admitted into pumps 10 and 11 after having been rid of its large or medium-sized waste.
  • This filtered liquid is then discharged by the recycling pump 10 into the watering reels 6-7 and projected from these reels onto the dishes to clean or rinse them before falling back into the bottom 3 of the tank for a new filtering and a new cycle of the liquid while part of this filtered liquid is returned by the drain pump 11 into the tank 3 through the microfilter 29 so as to be gradually freed of micro-waste.
  • the medium filter 26 can be removable or fixed and have a flat or slightly conical active surface whose convexity is turned upwards.
  • the medium filter 26 comprises in its active surface a depression 31 for receiving a removable assembly 32 consisting of a microfilter 29, and a coarse filter 28.
  • This coarse filter or drain filter 28 comprises a receptacle 34 whose bottom is a large mesh element.
  • the receptacle 34 of the large filter 28 is itself housed in a well 35 arranged in one end of the depression 31. This well 35 is in direct and exclusive communication with the inlet opening 19 of the drain pump.
  • the large filter 28 is intended to retain large waste which could hamper the operation of the drain pump II.
  • the microfilter 29 comprises a microfiltration pot 33 consisting of a closed box provided with an inlet pipe 36, at least a portion of the wall of which consists of a very fine mesh element 27.
  • the upper wall of the microfilter pot consists of the fine mesh element 27 of the order of a few tenths of a millimeter, for example two tenths of a millimeter, while the side and bottom walls are solid walls, and the inlet pipe puts the microfiltration pot 33 into communication with the outside.
  • This inlet manifold 36 has its free end 37 facing downwards, so that when the removable assembly 32 is placed in the depression 31 of the medium filter 26 which is already mounted in the bottom of the tank 3 , this free end 37 of the inlet pipe 36 covers and encloses a connection pipe 38 of a liquid guide channel 39 formed in the opening 19 and the intake pipe 20 of the drain pump 11.
  • the drain pump 11 during the drain rotates in one direction to suck liquid from the bottom 25 of the tank 3, through its inlet opening 19, and discharge it through the pipe.
  • discharge 23 and the non-return valve 24 to the outside of the machine, and during the washing and rinsing of the dishes turns in the opposite direction to discharge through the channel the guide the liquid 39, the connecting pipes 38 and pipe inlet 36, the microfiltration pot 33 and the fine mesh element 27 of the microfilter 29 and return to the tank 3, part of the liquid in the bottom of the tank 3.
  • the micro-waste is then retained in the microfiltration pot 33 by the fine mesh element 27 of the microfilter 29.
  • the liquid in the tank 3 is thus gradually freed of micro-waste and the dishes cleaned with a liquid thus filtered requires only a reduced quantity of water in the washing and rinsing sequences of the operating programs of the dishwasher 1, compared to those required in known devices, while obtaining clean cleaned dishes when it comes out of the machine.
  • the dishwasher 1 thus comprises in the first place a combination of a recycling pump 10 and a drain pump 11 driven by the same electric motor rotating in both directions of rotation, the drain pump being provided with a non-return valve on its discharge line; second, a mdyen filter separating from the rest of the tank, the two recycling and emptying pumps arranged in the bottom of this cuvée, and thirdly a microfilter, which create during the washing and rinsing of the dishes, by the recycling pump a current of liquid through the medium filter to get rid of large and medium waste, and by the drain pump, a stream of liquid already filtered by the medium filter, through the microfilter to get rid of micro-waste, and during the drain, an evacuation liquid from the tank by the drain pump rotating in the opposite direction to that allowing microfiltration.
  • the recycling 10 and drain 11 pumps mounted on a common shaft 13 rotate in the direction of arrow 40.
  • the recycling pump 10 sucks a large part of the liquid which has passed through the medium filter 26 and discharges it into the sprinkler reels 6 and 7 while the drain pump 11, because of the presence of the non-return valve 24 on the discharge line, sucks through a passage opening 42 of the shaft of its wheel 22 a part of the liquid which has already passed through the medium filter 26 and discharges it through the microfilter 29 into the tank 3 for microfiltration of the liquid.
  • the two pumps 10 and 11 thus create in the tank 3, two independent streams of liquid for filtering the latter.
  • the two pumps 10 and 11 rotate in the opposite direction to the previous one, indicated by an arrow 41.
  • the recycling pump 10 is in this case primed, following an entry of air through an air intake chimney 45, while the drain pump 11 sucks the liquid and discharges it outside through its discharge pipe 23 and its non-return valve 24.
  • the liquid sucked comes from different circuits: firstly the liquid sucked results from a suction of liquid from the bottom of the tank 3 through the large filter 28 in its intake opening 19 and its suction pipe 20; secondly the sucked liquid results from a aspiration of liquid through the fine mesh element 27, the microfiltration pot 33 of the microfilter 29, the pipes 36, 38, the liquid guide channel 39, in the suction line 20; thirdly, the aspirated liquid results from a suction of liquid through the passage opening 42 of the shaft.
  • the second suction liquid circuit has several advantages. This second circuit of aspirated liquid which crosses the microfiltration pot 33 makes it possible to entrain the micro-wastes which are retained there and to evacuate them.
  • the microfilter 29 does not hinder the recycling of the liquid carried out by the recycling pump 10 and therefore the cleaning of the dishes, while allowing a progressive microfiltration of this liquid.
  • the meshes of the medium filter 26 which occupies the majority of the surface of the bottom of the tank 3 of the dishwasher, have been determined so that the flow of recycling liquid is sufficient for effective washing and rinsing of the dishes, despite the presence of waste retained by these filters.
  • the quantity of liquid consequently the quantity of liquid provided for each phase of the operating programs is thus advantageously reduced compared to that required in a known dishwasher, without compromising the efficiency of the machine.
  • a reduction in the quantity of liquid results in an advantageous reduction in the consumption of electrical energy in the implementation of each of the pro operating grams of the dishwasher 1.
  • the dishwasher 1 produced according to the invention is therefore economical in its operation.
  • the microfilter 29 can be mounted in the tank 3 below the medium filter 26 in the part where the recycling 10 and drain 11 pumps are located, and placed in communication with the drain pump 11 in view of an operation similar to that of the microfilter of the example illustrated and described in the preceding paragraphs.
  • the liquid discharged through the microfilter 29 by the drain pump 11, following the washing and rinsing of the dishes is discharged into the tank 3 in the space below the medium filter 26 instead of being returned in the tank 3 in the space above this medium filter 26.
  • the recycling pump 10 then returns to the watering reels, liquid filtered both by the medium filter 26 and partially by the microfilter 29.

Landscapes

  • Washing And Drying Of Tableware (AREA)
EP19850400054 1984-01-20 1985-01-11 Geschirrspüler mit Mikrofilter Expired EP0150147B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8400892A FR2558366B1 (fr) 1984-01-20 1984-01-20 Lave-vaisselle a microfiltrage de liquide
FR8400892 1984-01-20

Publications (3)

Publication Number Publication Date
EP0150147A2 true EP0150147A2 (de) 1985-07-31
EP0150147A3 EP0150147A3 (en) 1985-09-18
EP0150147B1 EP0150147B1 (de) 1988-06-22

Family

ID=9300328

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850400054 Expired EP0150147B1 (de) 1984-01-20 1985-01-11 Geschirrspüler mit Mikrofilter

Country Status (3)

Country Link
EP (1) EP0150147B1 (de)
DE (1) DE3563411D1 (de)
FR (1) FR2558366B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0178202A1 (de) * 1984-09-11 1986-04-16 Esswein S.A. Geschirrspüler mit Mikrofilter für Flüssigkeit
EP0514279A1 (de) * 1991-05-17 1992-11-19 Esswein S.A. Mit Mikrofilter ausgestattete Waschmaschine
US8342194B2 (en) 2005-08-20 2013-01-01 Premark Feg L.L.C. Conveyor ware washer

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU527001B2 (en) * 1978-12-29 1983-02-10 Hobart International Inc. Warewasher bypass soil collector
US4392891A (en) * 1980-07-02 1983-07-12 Hobart Corporation Dishwasher soil collecting circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0178202A1 (de) * 1984-09-11 1986-04-16 Esswein S.A. Geschirrspüler mit Mikrofilter für Flüssigkeit
EP0514279A1 (de) * 1991-05-17 1992-11-19 Esswein S.A. Mit Mikrofilter ausgestattete Waschmaschine
FR2676348A1 (fr) * 1991-05-17 1992-11-20 Esswein Sa Lave-vaisselle muni d'un microfiltre.
US8342194B2 (en) 2005-08-20 2013-01-01 Premark Feg L.L.C. Conveyor ware washer

Also Published As

Publication number Publication date
FR2558366B1 (fr) 1987-04-10
FR2558366A1 (fr) 1985-07-26
EP0150147B1 (de) 1988-06-22
EP0150147A3 (en) 1985-09-18
DE3563411D1 (en) 1988-07-28

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