EP2359734A1 - Geschirrspüler - Google Patents

Geschirrspüler Download PDF

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Publication number
EP2359734A1
EP2359734A1 EP11003775A EP11003775A EP2359734A1 EP 2359734 A1 EP2359734 A1 EP 2359734A1 EP 11003775 A EP11003775 A EP 11003775A EP 11003775 A EP11003775 A EP 11003775A EP 2359734 A1 EP2359734 A1 EP 2359734A1
Authority
EP
European Patent Office
Prior art keywords
filter
outlet
sedimentation chamber
dishwasher according
inlet
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.)
Withdrawn
Application number
EP11003775A
Other languages
English (en)
French (fr)
Inventor
Stefan Füglein
Rolf Stahlmann
Gordon Elger
Matthieu Rousset
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.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
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 Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Publication of EP2359734A1 publication Critical patent/EP2359734A1/de
Withdrawn legal-status Critical Current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
    • A47L15/4246—Details of the tub
    • 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
    • A47L15/4219—Water recirculation
    • A47L15/4221—Arrangements for redirection of washing water, e.g. water diverters to selectively supply the spray arms

Definitions

  • the invention concerns a dishwasher, comprising a first wash circulation system with a wash circulation pump to circulate washing liquid from a sump to at least one spray device arranged in a wash tank.
  • washing liquid is normally drawn from a sump at the bottom of a wash tank, pumped by a circulation pump into spray arms distributing the wash liquid within the wash tank to remove soils from dishes located in dish baskets in the tank.
  • a filter screen or filter mesh is deposited on the outlet side of the circulation pump.
  • a fine filter or even a micro fine filter can be used.
  • backwash jets are directed against the filter in an attempt to clear the filter and prevent clogging.
  • the circulation pump itself needs to be actuated so that the backwash jets work against a high pressure so that cleaning may be incomplete.
  • behind a clogged filter increasing pressure builds up so that soil is pressed into the filter and embedding itself fixedly, so that it cannot be easily removed.
  • a filter in the sump normally comprising a fine filter surrounding the final drain inlet where only a coarse filter is provided.
  • Backwashing or cleaning filter is very complex and sophisticated in such a case, so that usually no micro-fine filters are used. Water or washing liquid passing the circumferential fine filter is recirculated again by the circulation pump.
  • filter clogging can adversely effect the dishwashers cleaning ability, causing poor washability and indirectly increased water and energy consumption.
  • a dishwasher of the above mentioned type wherein a second circulation system comprising a further pump and a filtration device is provided to filter washing liquid independently from actuation of the circulation pump of the first circulation system.
  • a second circulation system is provided, which is dedicated to the process of filtering the washing liquid.
  • the circulation pump of the first circulation system and the further pump driving the second circulation system can be controlled independently. Filtration and filter cleaning no longer effect the washing cycle itself, so that the freedom for cycle design is increased. Phases with 100 % filtration and/or 100 % filter cleaning are now possible.
  • Another advantage of the current invention is that a flat sump design can be achieved, since the filtration device no longer needs to be positioned in the sump itself, as well as backwashing devices. A reduction of the total water volume in the sump is possible.
  • the filtration device can comprise a micro fine filter and/or a fine filter. 100 % micro fine filtering is now possible without the risk of adversely effecting the dishwashers cleaning ability.
  • At least one filter of the filtration device forms part of the wall of the wash tank.
  • This filter can for example be a filter screen or a filter mesh and is preferably a micro fine filter. In this manner, a visible clue to the improved filtering is given to the customer. Additionally, easy replacement of the filter is possible and space is effectively used.
  • a device for backwashing the filter can advantageously be provided in the wash tank.
  • the device for backwashing the filter comprises nozzles located at the outwardly facing ends of at least one spray arm.
  • the device for backwashing the filter is preferably driven by the circulation pump of the first circulation system, while the further pump is not active. Cleaning of the filter forming part of the wall of the wash tank can this manner be effected at the same time the dishes are washed.
  • the first circulation system also comprises a filtration device.
  • this additional filtration device will only comprise coarse filters and/or fine filters, so that micro fine filtering remains the domain of the second circulation system.
  • Such an additional filtration device or part of the filtration device of the second circulation system may be located in the sump.
  • the already known fine filter placed in the sump can be used for the first as well as for the second circulation system.
  • the additional filtration device or the part of the filtration device located in the sump only apply to the first or the second circulation system.
  • Such an additional filtration device, or part of the filtration device can, if assigned to the second circulation system, act as a prefiltering stage for a micro fine filter, for example forming part of the wall of the wash tank.
  • the further pump is the drain pump.
  • the drain pump not only drives the draining of water out of the dishwasher, but also the second circulation system.
  • a control unit of the dishwasher may then independently control operation of the drain pump so that either draining or filtration/cleaning of the filter or the filters is effected.
  • a backflow valve can be provided upstream of the drain pump.
  • the second circulation system comprises a sedimentation chamber located downstream of the drain pump and having a filter, in particular a micro fine filter, in its upper part.
  • a filter in particular a micro fine filter
  • water is pumped into the sedimentation chamber by the drain pump, at a pressure such that the water level just reaches the filter arranged in the upper part of the sedimentation chamber wall.
  • the filter can, like already mentioned, form a part of the wall of the wash tank.
  • the soil particles, which cannot pass the filter remain in the sedimentation chamber.
  • washing liquid may remain in the sedimentation chamber and the soil particles slowly begin to sediment, i.e. sink down to the bottom of the sedimentation chamber, where they can be simply drained away.
  • the dishwasher may comprise a junction having at least one inlet connected to the outlet side of the drain pump and at least two outlets, wherein a first outlet is connected to the sedimentation chamber and a second outlet is connected to a drain tube for final drainage of washing liquid.
  • a u-like bend of the drain tube for finally draining washing liquid can be located higher than the highest point of the second circulation system, in particular the sedimentation chamber.
  • washing liquid is pumped by the drain pump at a low pressure, the water level can only be raised to reach the filter located in the sedimentation chamber, but no water is drained. If driven at a higher speed, water can be drained. Still, the possibility exists that washing liquid may flow back into the wash tank during draining.
  • a switch is provided at the junction, wherein the switch is adapted to selectively connect at least the inlet and the first outlet and the inlet and the second outlet.
  • the at least two positions of the switch correspond to "filtration", i.e. use of the second circulation system, and "draining". If the switch is in a first position, connecting the inlet with the first outlet, washing liquid is circulated through the second circulation system, passing the sedimentation chamber and the filter. Please note that when the pump is turned off, soil particles begin to sink down to the bottom of the sedimentation chamber, which can preferably be adjacent to the junction and the switch. To drain water from the dishwasher, the switch is in the second position, connecting the inlet with the second outlet. On actuation of the pump, water is drained from the dishwasher.
  • water can be reloaded from the sedimentation chamber by turning the pump off and switching the switch back to the first position, so that water and soil particles residing at least in the lower part of the sedimentation chamber flow into the tub section between the backflow valve or the drain pump and the junction.
  • the switch is actuated into the second position and the soil-laden washing liquid can easily be drained.
  • this process can be repeated one or more times. In this manner, at least in multiple steps, the sedimentation chamber can be fully drained. Even heavy dirt can be handled. If the filter of the sedimentation chamber is formed as part of the wall of the wash tank and a device for backwashing the filter is used to clean the filter, the water accumulating in the sedimentation chamber can also be drained in this manner.
  • an outlet in the upper part of the sedimentation chamber can be connected to the drain tube such that an overflow for a completely filled sedimentation chamber is formed.
  • the drain pump is controllable to effect a tangential cleaning of the filter. This means, the drain pump is driven at a high speed so that the water passes tangentially along the filter in the sedimentation chamber, taking along the soil particles which are drained through the overflow and subsequently through the drain tube.
  • a backflow valve can be provided downstream of the outlet of the sedimentation chamber.
  • the junction can comprise a second inlet connected to an outlet in the upper part of the sedimentation chamber such that an overflow for a completely filled sedimentation chamber is formed and the switch can be actuated so that the first inlet is connected to the first outlet and at the same time the second inlet is connected to the first outlet, and so that the first inlet is connected to the second outlet.
  • the first position of the switch, connecting the first inlet to the first outlet and the second inlet to the second outlet allows for filtration of the washing liquid at a low speed of the drain pump. Even if the filter is clogged in such a situation, overflowing washing liquid can simply be drained through the final drain tube.
  • washing liquid is directly drained to the drain tube. If the switch is in the second position, connecting the first inlet to the second outlet, washing liquid can be directly be drained.
  • the switch can additionally be actuated so that the first inlet is connected to the first outlet and at the same time the second inlet and the second outlet are closed.
  • This third position is especially preferable if a sensor device adapted to sense a clogging of the filter is used, for example a hydrostatic sensor connected to the upper end of the sedimentation chamber. If during filtration of the washing liquid the filter is clogged, washing liquid filling the overflow is not drained through the drain tube, but confined to the overflow so that a strong increase in pressure can be measured. Adequate measures can be taken in such a case, like notifying the user that the filter is to be cleanned. Cleaning or draining of the filter is again effected in the first position of the switch, when the second inlet is connected to the second outlet.
  • a flat sump can be realised, possibly comprising a flat fine filter acting as a pre-filtering stage for the filtration system.
  • a sensor device adapted to sense a clogging of the filter can be provided.
  • This sensor device can be hydrostatic sensor, which, in case a sedimentation chamber is provided, can be connected to the upper end of the sedimentation chamber.
  • clogging of the filter can be detected in such a configuration and countermeasures can be taken and/or a warning can be output to a user to exchange or manually clean the filter.
  • Fig. 1 shows a dishwasher 1 according to the first variant of the invention. It comprises a wash tank 2 wherein soiled dishes can be loaded in dish baskets (not shown) to be washed. Two spray arms 3, 4 are provide in the wash tank 2. During operation of the dishwasher 1, washing liquid is drawn from a sump 5 by a circulation pump 6 and recirculated into the wash tank 2 via the spray arms 3, 4. While circulating in this first circulation system 7, the washing liquid passes a flat fine filter 8 located in the sump 5.
  • the fine filter 8 is part of a filtration device 9 of the first circulation system 7. However, filtration in the first circulation system 7 depends on the actuation of the circulation pump 6, and no micro fine filtering is available.
  • a coarse filter 25 can be provided in the sump 5 where washing liquid is drained.
  • the dishwasher 1 comprises a second circulation system 10 comprising a filtration device 11 with a micro fine filter 12 to filter washing liquid independently from actuation of the circulation pump 6 of the first circulation system 7.
  • the second circulation system 10 is driven by the drain pump 13, by which usually water is drained from the sump 5 to a drain tube 14.
  • the dishwasher 1 comprises a junction 15 with a switch 16.
  • the junction 15 has one inlet connected to the outlet side of the drain pump 13 and two outlets, namely a first outlet connected to a sedimentation chamber 17 and a second outlet connected to the drain tube 14.
  • the switch 16 can be actuated between two positions.
  • the inlet In a first position, the inlet is connected to a first outlet, in a second position the inlet is connected to the second outlet. Also provided are backflow valves 18 preventing the flowback of water into the sump 5 or the sedimentation chamber 17. Please note that the narrow, lower portion 24 is also a part of the sedimentation chamber 17.
  • the micro fine filter 12 is arranged so that it forms part of the wall 19 of the wash tank 2. Washing liquid passing through the micro fine filter 12 from the sedimentation chamber 17 is directly recirculated into the wash tank 2.
  • the micro fine filter 12 can easily be cleaned by backwashing using a device 20 for backwashing the filter 12 located in the wash tank 2.
  • the device 20 comprises nozzles 21 arranged circumferentially around the upper spray arm 3 facing outwardly, so that backwash jets ejected from the nozzles 21 hit the micro fine filter 12, thereby cleaning it.
  • nozzles aimed at the filter 12 can be provided at the lower spray arm 4 or other spray devices.
  • the switch 16 is actuated into the first position, connecting the inlet to the first outlet and therewith the sedimentation chamber 17.
  • the drain pump 13 is now actuated at a speed which raises the washing liquid level in the sedimentation chamber to a height in which washing liquid can just pass the filter 12. In this manner, the pressure exerted on the filter 12 is as low as possible, preventing soil particles from being pressed into the filter mesh or screen. This means, soil particles at or in the filter 12 can usually still be removed by actuation of the device 20 for backwashing the filter 12.
  • the drain pump 13 is stopped and the switch 16 is actuated to the second position, now connecting the inlet to the second outlet and therewith the drain tube 14. Meanwhile, the soil particles in the remaining column of washing liquid filling the sedimentation chamber 17 begin to sink down to the bottom of the sedimentation chamber 17, i.e. the lower portion 24. There, the sedimented particles remain close to the switch 16.
  • washing liquid can be drained from the sump 5 to the drain tube 14.
  • the portion 22 between the sump-side backflow valve 18 and the switch 16 can at least partly be emptied.
  • the switch 16 is again actuated into the first position so that at least part of the washing liquid column in the sedimentation chamber 17, in particular the lower part containing the soil particles, flows into the portion 22.
  • the switch 16 is then again actuated into the second position, so that the washing liquid reloaded from the sedimentation chamber 17 containing the soil particles can be drained through the drain tube 14.
  • This process of draining the sedimentation chamber 17 can, if required, be repeated one or several times, for example, if it cannot be completely drained in one step.
  • the switch is again actuated into the first position, washing liquid from the sedimentation chamber 17 containing soil particles is drained into the portion 22, the switch is again actuated into the second position, and the washing liquid is drained.
  • the micro fine filter 12 as part of the wall 19 of the wash tank 2 can be seen by the user looking into the dishwasher, assuring him of a good cleaning performance wherein soil particles are less often recirculated through the first circulation system 7. Additionally, the micro fine filter 12 can easily be disassembled and cleaned by hand.
  • the dishwasher also comprises a hydrostatic sensor 23, located at the upper end of the sedimentation chamber 17.
  • the hydrostatic sensor 23 measures a high pressure and therefore countermeasures and/or warnings to the user can be effected.
  • Fig. 2 shows a dishwasher 1' according to the second variant, wherein like parts are designated by like numerals.
  • the first circulation system 7 and the part of a filter device 9 located in the sump 5 are similar in all embodiments, thus, the description is omitted in the following.
  • the drain pump 13 also acts as a further pump, having a switch 16 at a junction 15 downstream.
  • an outlet 26 is provided in the upper part of the sedimentation chamber 17. This outlet 26 is connected to the final drain tube 14 so that an overflow 27 of a completely filled sedimentation chamber 17 is formed.
  • a backflow valve 28 is provided along the overflow 27.
  • the overflow 27 may be used in a tangential cleaning step for the filter 12.
  • the switch 16 is in a first position, so that the inlet on the drain pump 13 side and the first outlet leading to the sedimentation chamber are connected.
  • the drain pump 13 is then driven at a high speed, so that washing liquid passes tangentially upwards along the filter 12, which again can be a micro fine filter, taking with it soil particles sticking to the filter or sedimented in the sedimentation chamber 17.
  • the soil-laden washing liquid then passes through the overflow 27 and is discharged through the drain tube 14.
  • a device 20 for backwashing the filter 12 is in principle not needed, but may additionally be provided.
  • soil accumulated in the lower portion 24 of the sedimentation chamber 17 can also be drained using the same process as described with reference to fig. 1 , i.e, at least partly emptying the section 22, moving the switch 16 to the first position, moving the switch 16 to the second position and again driving the pump.
  • a third variant of a dishwasher 1" according to the invention is shown in fig. 3 .
  • the difference to the variant in fig. 2 is that in this case a second inlet connected to the overflow 27 is provided at the junction 15 and a different switch 16' is used which can be actuated into three positions.
  • the switch 16' comprises a rotatable actuator 29 having an expanded section 30 at one side. This configuration allows to dispense with the backflow valve 28.
  • the switch 16' can be actuated into three positions shown in fig. 5 , each corresponding to a mode of function of the dishwasher 1".
  • a first position I the first inlet corresponding to the section 22 is connected to the first outlet corresponding to the sedimentation chamber 17, while the second inlet corresponding to the overflow 27 and the second outlet corresponding to the drain tube 14 are blocked.
  • the filter 12 of the filtration device 11 and the sedimentation chamber 17 are used for filtration of the washing liquid in the second circulation system 10. Washing liquid is pumped into the sedimentation chamber 17 by the drain pump 13 at a low speed such that at nearly zero pressure washing liquid may pass through the filter 12 into the wash tank 2, thereby being filtered.
  • a hydrostatic sensor 23 can again be used in this variant to detect clogging of the filter 12.
  • the third position III connects a first inlet corresponding to the section 22 to the first outlet corresponding to the sedimentation chamber 17 and at the same time the second inlet corresponding to the overflow 27 to the second outlet corresponding to the drain tube 14.
  • a tangential cleaning of the filter 12 as described above with reference to fig. 2 can be effected while the drain pump 13 runs at a high speed. Washing liquid is pumped from the sump 5 through the section 22, then through switch 16' into the sedimentation chamber 17, passing the filter 12. Afterwards, the washing liquid passes the overflow 27, again flows through switch 16' to be drained through a drain tube 14.

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  • Washing And Drying Of Tableware (AREA)
  • Cleaning By Liquid Or Steam (AREA)
EP11003775A 2007-08-08 2007-08-08 Geschirrspüler Withdrawn EP2359734A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07015582A EP2022385B1 (de) 2007-08-08 2007-08-08 Geschirrspüler

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP07015582.5 Division 2007-08-08

Publications (1)

Publication Number Publication Date
EP2359734A1 true EP2359734A1 (de) 2011-08-24

Family

ID=38871562

Family Applications (2)

Application Number Title Priority Date Filing Date
EP11003775A Withdrawn EP2359734A1 (de) 2007-08-08 2007-08-08 Geschirrspüler
EP07015582A Not-in-force EP2022385B1 (de) 2007-08-08 2007-08-08 Geschirrspüler

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP07015582A Not-in-force EP2022385B1 (de) 2007-08-08 2007-08-08 Geschirrspüler

Country Status (10)

Country Link
US (1) US20110197934A1 (de)
EP (2) EP2359734A1 (de)
KR (1) KR20100041834A (de)
CN (1) CN101778590B (de)
AT (1) ATE510487T1 (de)
AU (1) AU2008286021B2 (de)
CA (1) CA2695918A1 (de)
PL (1) PL2022385T3 (de)
RU (1) RU2451480C2 (de)
WO (1) WO2009018903A1 (de)

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RU2451480C2 (ru) 2012-05-27
RU2010108337A (ru) 2011-09-20
US20110197934A1 (en) 2011-08-18
CN101778590A (zh) 2010-07-14
KR20100041834A (ko) 2010-04-22
AU2008286021B2 (en) 2011-03-24
EP2022385B1 (de) 2011-05-25
CA2695918A1 (en) 2009-02-12
CN101778590B (zh) 2013-03-06
ATE510487T1 (de) 2011-06-15
WO2009018903A1 (en) 2009-02-12
EP2022385A1 (de) 2009-02-11
PL2022385T3 (pl) 2011-10-31
AU2008286021A1 (en) 2009-02-12

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