US20110226289A1 - Dishwasher - Google Patents
Dishwasher Download PDFInfo
- Publication number
- US20110226289A1 US20110226289A1 US13/121,510 US200913121510A US2011226289A1 US 20110226289 A1 US20110226289 A1 US 20110226289A1 US 200913121510 A US200913121510 A US 200913121510A US 2011226289 A1 US2011226289 A1 US 2011226289A1
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- United States
- Prior art keywords
- filter
- soil
- trap
- flow
- dishwasher
- 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.)
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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
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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
- A47L15/4204—Flat filters
-
- 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
- A47L15/14—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber
-
- 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
- A47L15/4223—Devices for water discharge, e.g. devices to prevent siphoning, non-return valves
-
- 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
- A47L15/4244—Water-level measuring or regulating arrangements
-
- 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
- A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
- A47L2401/34—Other automatic detections
-
- 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
- A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
- A47L2501/02—Water discharge, e.g. opening or closure of discharge valve
Definitions
- the present invention relates to a dishwasher comprising a washing chamber arranged for holding soiled items to be washed, a filter and a circulation pump.
- the circulation pump is operable to create a circulation flow of washing liquid through the washing chamber, through the filter and back to the washing chamber.
- the washing chamber is such arranged that, when the flow of washing liquid passes through the washing chamber, soil is released from the items to be washed and caught in the flow.
- the filter is such arranged that, when the flow of washing liquid with soil passes through the filter, soil is separated from the flow of washing liquid and caught at the filter.
- a problem with dishwashers of the above mentioned type is that the filter has a tendency to clog by soil particles that are caught at the filter. Therefore, conventional dishwashers are normally equipped with two filters, i.e. a fine-mesh filter and a coarse-mesh filter. The circulation flow is then divided between the two filters, wherein most of the flow passes through the coarse-mesh filter and the rest of the flow passes through the fine-mesh filter. Thereby, the major part of the larger soil particles will be caught at the coarse-mesh filter. The finer particles will only be caught at the fine-mesh filter, some instantly and some after passing through the coarse-mesh filter and passing through recirculation. Thus, this arrangement reduces the load on the fine-mesh filter.
- the filter might clog during the dishwashing. To achieve a desired washing result, the filter may need to be cleaned, which is cumbersome for the user.
- Dishwashers equipped with a filter cleaning function have previously been designed.
- One example of filter cleaning is flushing of water through the filter in a direction opposite to the circulation direction. Filter clogging could however still be a problem.
- the invention is based on the insight that it would be advantageous to remove soil from the circulation flow, preferably as quickly as possible. Due to the arrangement of a soil removing unit and a soil trap according to the present invention, soil is removed from the filter, and a soil trap, located separate from the circulation flow, can store the soil particles separate from the circulation flow. The risk of clogging the filter can thus be reduced. Furthermore, with reference to prior art dishwashers described above having a coarse-mesh filter and fine-mesh filter, wherein larger soil particles are caught at the coarse-mesh filter and there stored in the circulation flow, the present invention solves the problem of such larger particles continuously generating smaller soil particles that recirculate with the circulation flow. Thus, a dishwasher according to the present invention provides a more efficient filter system.
- a dishwasher comprising a washing chamber arranged for holding soiled items to be washed, a filter and a circulation pump.
- the circulation pump is operable to create a circulation flow of washing liquid through the washing chamber, through the filter and back to the washing chamber.
- the washing chamber is such arranged that, when the flow of washing liquid passes through the washing chamber, soil is released from the items to be washed and caught in the flow.
- the filter is such arranged that, when the flow of washing liquid with soil passes through the filter, soil is separated from the flow of washing liquid and caught at the filter.
- the dishwasher further comprises a soil trap, which is located separate from the circulation flow, and a soil removing unit comprising a transport unit for transport of the soil caught at the filter into the soil trap.
- the soil on the items to be washed is usually food scraps but can be any other substance the user wishes to wash off.
- the washing liquid is typically water with resolved dishwasher detergents but can be any other washing liquid.
- the soil removing unit of the present invention comprises a transport unit, arranged to transport the soil caught at the filter to the soil trap.
- the transport unit can be arranged to push or draw soil caught at the filter surface over the filter surface and into the soil trap.
- the transport unit can be arranged to push the soil by flushing a fluid substantially parallel to the filter surface towards the soil trap.
- the fluid can for example be the washing liquid, fresh water or a combination thereof. The fluid will follow the soil into the soil trap.
- Nozzles can be arranged at the periphery of the filter, directed towards the inlet of the soil trap.
- the transport unit can alternatively be arranged as a mechanical scraper.
- the soil removing unit can further comprise a filter cleaning unit, arranged to release soil from the filter such that it is more easily caught by the transport unit.
- the filter cleaning unit can be arranged to force fluid through the filter in a direction opposite to the circulation flow direction for releasing soil.
- the fluid can for example be the washing liquid, fresh water or combinations thereof.
- the filter cleaning unit can be arranged to provide air or gas bubbles through the filter.
- the main part of the filter is then preferably located below the washing liquid level in the dishwasher and the filter cleaning unit comprises air or gas outlets arranged for providing bubbles through the filter in a direction opposite the direction of the circulation flow. Bubbles through the filter are advantageous also due to that the bubbles initiate vibrations to the filter, which will loosen soil from the filter.
- the filter cleaning unit can alternatively or in addition to the bubbles comprise other vibration means for loosening of soil particles, for example biased, such as spring loaded agitating devices or devices imparting oscillating forces to the filter.
- the soil removing can be performed continuously, pulsed or at predetermined intervals.
- a pressure sensor can for example be arranged in the dishwasher, for example at the circulation pump, to indicate a pressure build up due to filter clogging, whereby soil removal can be initiated.
- the soil removing unit can also be activated at predetermined intervals.
- the filter cleaning unit is activated just before the transport unit, whereby soil particles are first loosened from the filter and then transported to the soil trap.
- the soil trap is preferably located separate from the circulation flow of washing liquid, whereby the circulation flow is not guided into the soil trap. Instead, the circulation flow is guided to the circulation pump via a sump.
- the sump is a container at the bottom of the dishwasher, which container is connected to the circulation pump and to the drain of the dishwasher.
- the sump is arranged below a glass trap, which is a very coarse filter arranged to protect the circulation pump from large particles like tooth picks or pieces of broken glass.
- the soil trap can preferably be a liquid-tight container for collecting the soil.
- the inlet of the soil trap can preferably be located at a position above a washing liquid level of the dishwasher. This is to let the soil fall by gravitation into the soil trap without tendency to float out of it.
- the inlet of the soil trap placed above the washing liquid level does further prevent the circulation flow from entering the soil trap.
- the circulation flow can then be recirculated via the sump, without any need of refill of washing liquid.
- the washing liquid can be refilled to keep a desired washing liquid level.
- the outlet of the soil trap is connected to the drain of the dishwasher.
- the circulation flow refers to the main part of the washing liquid, which is circulated by the circulation pump.
- the soil trap is a permeable or a semi-permeable container arranged separate from the circulation flow, for example a fine-mesh container.
- the fluid of the transport unit which has followed the soil into the soil trap, can then leak out through the wall of the soil trap and be conveyed into the sump. This is advantageous in that the liquid level in the soil trap would be self regulating at a low level. However, in such embodiments of the invention, there is a minor, auxiliary circulation flow through the soil trap.
- the washing liquid level in the dishwasher refers to the normal level of washing liquid in the dishwasher during normal operation of the circulation pump. However, periods, preferably shorter, of higher washing liquid levels, where washing liquid is allowed to flow into the soil trap, could be acceptable.
- valves can be arranged at the sump and at the outlet of the soil trap.
- the valves are open during drainage and closed during circulation or any other non-drainage situations during the dishwashing.
- the valves can alternatively be replaced by a drain pump, which is then turned on and off correspondingly to the opened and closed valves.
- the valves can be individually controlled. Alternatively, only one of the valves is replaced by the drain pump.
- the soil trap can further comprise a return flow inhibitor to prevent reflow of soil out of the soil trap and back into the circulation flow.
- the return flow inhibitor can for example be a hopper or funnel shaped trap device, downwards directed flanges, a screening sheet or a valve.
- the filter of the present invention can be a net, a fabric or a grating, but as the filter of the present invention is cleaned frequently, it can also, preferably, be a fine-mesh filter. In a dishwasher according to the prior art, the flow is divided to flow through a fine-mesh filter and a coarse-mesh filter, as described above in the background art section.
- the filter surface comprises a filter edge which can be arranged in connection to the inlet of the soil trap, whereby soil can be transferred by the transport unit from the filter surface and tip over the edge into the soil trap.
- the surface of the filter can also be inclined sloping downward away from the inlet of the soil trap, such that the filter edge proximal to the soil trap is raised relative the distal end to let the edge of the filter be above the washing liquid level as described above.
- the surface of the filter can be plane or be inclined such that the distal end of the filter is raised relative the edge proximal to the soil trap.
- the filter can be located completely or partly under the washing liquid level of the dishwasher. It is also possible to have the circulation flow passing through the filter above the washing liquid level of the dishwasher.
- the filter can be one integral unit or comprise several subfilters.
- the shape of the filter can be circular, triangular, rectangular, or combinations thereof.
- the surface of the filter can be flat or curved.
- the filter can be built up by several subfilters into the shape of for example a truncated pyramid or cone.
- the soil trap can be arranged in the centre of the sump or at one edge.
- the soil trap can be surrounded by filter surfaces, or the soil trap can be arranged to one side of the filter.
- the soil trap can be extended along the filter edge and/or centred between two filter surfaces.
- FIG. 1 is a perspective view of a dishwasher according to a preferred embodiment of the invention.
- FIG. 2 is a sectional perspective view of a part of a dishwasher according to an embodiment of the invention.
- FIG. 3 is a sectional view of the part of FIG. 2 , additionally showing the level of washing liquid and soil.
- FIG. 4 is a schematic diagram of flows according to an embodiment of the invention.
- FIG. 5 is a sectional perspective view of a part of a dishwasher according to an alternative embodiment of the invention.
- FIG. 6 is a sectional perspective view of a part of a dishwasher according to another alternative embodiment of the invention.
- FIG. 1 is a schematic perspective view of an embodiment of a dishwasher 1 according to the invention.
- the dishwasher 1 includes a washing chamber 3 , baskets 5 to hold soiled items to be washed, a spray arm 7 and a glass trap 9 arranged above a sump 17 .
- FIG. 2 is a sectional perspective view of a part of a dishwasher 1 according to an embodiment of the invention, showing a glass trap 9 , a filter 11 , a soil trap 15 and a sump 17 .
- the glass trap 9 is a very coarse filter, in this example a plane surface covered with regularly distributed circular holes 10 . Underneath the glass trap 9 there is arranged a fine-mesh filter 11 .
- the filter 11 has the shape of a truncated cone with its centre part raised relatively its periphery part. In the centre of the filter 11 , the soil trap 15 is located.
- the filter comprises a filter surface having a filter edge and the inlet of the soil trap is arranged abutting against the filter edge.
- the soil trap 15 is a liquid-tight cylinder with its upper end at the level of the filter surface and its lower end 19 connected to a drain 20 , c.f. FIG. 4 .
- the soil trap 15 is on its inner cylinder surface provided with two return flow inhibitors 21 in the form of hopper-shaped trap devices.
- On the upper end of the soil trap 15 there is provided a handle 23 for gripping the soil trap 15 at removal, in case of a desired cleaning.
- the dishwasher further comprises a soil removing unit comprising a transport unit 25 and a filter cleaning unit 26 .
- the transport unit 25 is in this embodiment nozzles 27 for water jets arranged in a tube 29 , which is attached at the periphery of the filter 11 .
- the nozzles 27 are directed parallel to the surface of the filter 11 towards the soil trap 15 .
- the tube 29 with the nozzles 27 is connected to a water source (alternatively to the circulation flow).
- the nozzles can alternatively be provided in the wall at the periphery of the filter.
- the filter cleaning unit 26 is arranged to clean the filter 11 from soil 31 that is stuck or adhered to the surface of the filter 11 .
- the filter cleaning unit 26 shown in FIG. 2 and FIG. 3 comprises three perforated tubes 32 , 33 , 34 arranged as rings of three different diameters underneath the filter.
- the tubes 32 , 33 , 34 are provided with air outlets to provide bubbles through the filter 11 .
- the tubes 32 , 33 , 34 are connected to an air source (not shown).
- the sump 17 is arranged underneath the glass trap 9 and is surrounding the cylinder shaped soil trap 15 . At the lower part of the sump 17 there is provided two outlets, one circulation outlet 35 connected to the circulation pump 37 and one drain outlet 39 connected to the drain 20 .
- the drain outlet 39 is arranged at the bottom level of the sump 17 to assure that the dishwasher can be completely drained.
- FIG. 3 is a sectional view of the dishwasher 1 as shown in FIG. 2 , further showing the liquid levels 41 , 42 and soil particles 31 .
- the user places soiled items to be washed in the baskets 5 of the dishwasher 1 , closes the front and starts the dishwasher.
- the components of the washing liquid, water and dishwasher detergents enters to the sump 9 with an inlet flow 44 through an inlet 45 .
- the dishwasher is, to a predetermined level, filled up with the washing liquid. Thereafter the circulation pump 37 creates a circulation flow 43 of the washing liquid through the washing chamber 3 via the spray arm 7 , pass the soiled items, into the sump 17 , through the filter 11 and back to the washing chamber 3 .
- the items placed in the washing chamber 3 are cleaned by the flow 43 of washing liquid.
- the flow 43 of washing liquid passes through the washing chamber 3 and soil 31 is released from the items to be washed and caught in the flow 43 .
- the glass trap 9 at the bottom of the washing chamber 3 protects the circulation pump 37 from larger particles like tooth picks or pieces of broken glass.
- the soil removing unit 25 , 26 releases soil 31 from the filter 11 and transports the soil 31 into the soil trap 15 .
- the filter cleaning unit 26 flushes air, generating bubbles, which bubbles transfers up through the filter 11 in a direction which is opposite to the direction of the circulation flow and releases stuck and adhered soil 31 from the filter 11 . This is partly due to vibrations imparted to the filter by the passing bubbles.
- the amount of generated bubbles and the length of the time periods at which they are released, is adapted such that the circulation flow maintains a flow rate which is acceptable for the cleaning operation.
- the nozzles 27 of the transport unit 25 flushes water during a limited period of time, whereby soil 31 is transferred from the filter 11 , over the filter surface, over the filter edge and falls by gravity into the soil trap 15 .
- the soil trap 15 is located separate from the circulation flow 43 , and is arranged to collect soil 31 and keep the soil 31 separate from the circulation flow 43 .
- the soil trap 15 is provided with return flow inhibitors 21 , in the shape of hopper shaped trap devices, which counteracts a reflow of soil 31 back into the circulation flow 43 .
- the major part of the filter surface is located under the washing liquid level 41 in the sump 17 of the dishwasher. Consequently, the nozzles 27 are arranged to push the soil over the filter surface across a simultaneous circulation flow through the filter surface.
- one valve 53 is arranged at the drain outlet 39 of the sump 17 and one valve 55 is arranged at the bottom of the soil trap 15 . If the liquid level 42 in the soil trap 15 reaches a predetermined highest level, soil 31 and washing liquid is drained from the soil trap 15 by opening of the valve 55 . The soil 31 and the washing liquid in the soil trap 15 is then drained in a soil flow 47 .
- valves 53 , 55 can alternatively be replaced by a drain pump, which is then turned on and off correspondingly to the opened and closed valves 53 , 55 .
- a drain pump which is then turned on and off correspondingly to the opened and closed valves 53 , 55 .
- only one of the valves 53 , 55 are replaced by a drain pump.
- the sump 17 and the soil trap 15 are drained through the drain 20 , by opening of the valves 53 , 55 (or alternatively by turning the drain pump on).
- FIG. 5 and FIG. 6 Alternative embodiments of the invention are shown in FIG. 5 and FIG. 6 . Only the divergence from the previously shown embodiment will be described here.
- the tubes 32 , 33 , 34 of the filter cleaning unit 26 in FIG. 2 and FIG. 3 has been replaced by a perforated hollow ring-shaped plate 51 .
- the perforations are nozzles, directed towards the under side of the filter.
- this plate can be connected to the source of fluid for filter cleaning, which can be air or gas (which can result in bubbles), recycled washing liquid, fresh water, etc.
- the shapes of the glass trap 9 , the filter 11 , the extension of the tubes 29 , 32 , 33 , 34 , the sump 17 , the soil trap 15 and the return flow inhibitors 21 are altered from circular to rectangular.
- the glass trap 9 and the fine-mesh filter 11 are of a flat, rectangular shape.
- the fine-mesh filter 11 is inclined with its raised edge adjacent to the inlet of the soil trap 15 .
- the soil trap 15 is a container with a rectangular through-cut.
- the sump 17 is located at on one side of the soil trap 15 .
- the tubes 29 , 32 , 33 , 34 are extended in one direction instead of, as the previously described, circular rings.
- the return flow inhibitors 21 are in the shape of flanges directed downwards. The function is as described with reference to the circular design, described with reference to FIG. 1-4 .
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- Water Supply & Treatment (AREA)
- Washing And Drying Of Tableware (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The present invention relates to a dishwasher (1) comprising a washing chamber (3) arranged for holding soiled items to be washed, a filter (11), a circulation pump (37), which is operable to create a circulation flow (43) of washing liquid through the washing chamber (3), through the filter (11) and back to the washing chamber (3). The washing chamber (3) is such arranged that, when the flow (43) of washing liquid passes through the washing chamber (3), soil (31) is released from the items to be washed and caught in the flow (43). The filter (11) is such arranged that, when the flow (43) of washing liquid with soil (31) passes through the filter, soil (31) is separated from the flow (43) of washing liquid and caught at the filter (11). The dishwasher (1) further comprises a soil trap (15), which is located separate from the circulation flow (43), and a soil removing unit (25, 26) comprising a transport unit (25) for transport of the soil (31) caught at the filter (11) into the soil trap (15).
Description
- The present invention relates to a dishwasher comprising a washing chamber arranged for holding soiled items to be washed, a filter and a circulation pump. The circulation pump is operable to create a circulation flow of washing liquid through the washing chamber, through the filter and back to the washing chamber. The washing chamber is such arranged that, when the flow of washing liquid passes through the washing chamber, soil is released from the items to be washed and caught in the flow. The filter is such arranged that, when the flow of washing liquid with soil passes through the filter, soil is separated from the flow of washing liquid and caught at the filter.
- A problem with dishwashers of the above mentioned type is that the filter has a tendency to clog by soil particles that are caught at the filter. Therefore, conventional dishwashers are normally equipped with two filters, i.e. a fine-mesh filter and a coarse-mesh filter. The circulation flow is then divided between the two filters, wherein most of the flow passes through the coarse-mesh filter and the rest of the flow passes through the fine-mesh filter. Thereby, the major part of the larger soil particles will be caught at the coarse-mesh filter. The finer particles will only be caught at the fine-mesh filter, some instantly and some after passing through the coarse-mesh filter and passing through recirculation. Thus, this arrangement reduces the load on the fine-mesh filter.
- However, also in these types of conventional dishwashers the filter might clog during the dishwashing. To achieve a desired washing result, the filter may need to be cleaned, which is cumbersome for the user.
- Dishwashers equipped with a filter cleaning function have previously been designed. One example of filter cleaning is flushing of water through the filter in a direction opposite to the circulation direction. Filter clogging could however still be a problem.
- It is therefore an object of the present invention to provide a dishwasher that alleviates at least some of the above mentioned problems.
- This object is achieved by a dishwasher having the features defined in the appended
claim 1. Preferred embodiments thereof are defined in the dependent claims 2-15. - Thus, the invention is based on the insight that it would be advantageous to remove soil from the circulation flow, preferably as quickly as possible. Due to the arrangement of a soil removing unit and a soil trap according to the present invention, soil is removed from the filter, and a soil trap, located separate from the circulation flow, can store the soil particles separate from the circulation flow. The risk of clogging the filter can thus be reduced. Furthermore, with reference to prior art dishwashers described above having a coarse-mesh filter and fine-mesh filter, wherein larger soil particles are caught at the coarse-mesh filter and there stored in the circulation flow, the present invention solves the problem of such larger particles continuously generating smaller soil particles that recirculate with the circulation flow. Thus, a dishwasher according to the present invention provides a more efficient filter system.
- According to one aspect of the invention, there is provided a dishwasher comprising a washing chamber arranged for holding soiled items to be washed, a filter and a circulation pump. The circulation pump is operable to create a circulation flow of washing liquid through the washing chamber, through the filter and back to the washing chamber. The washing chamber is such arranged that, when the flow of washing liquid passes through the washing chamber, soil is released from the items to be washed and caught in the flow. The filter is such arranged that, when the flow of washing liquid with soil passes through the filter, soil is separated from the flow of washing liquid and caught at the filter. The dishwasher further comprises a soil trap, which is located separate from the circulation flow, and a soil removing unit comprising a transport unit for transport of the soil caught at the filter into the soil trap.
- The soil on the items to be washed is usually food scraps but can be any other substance the user wishes to wash off. The washing liquid is typically water with resolved dishwasher detergents but can be any other washing liquid.
- The soil removing unit of the present invention comprises a transport unit, arranged to transport the soil caught at the filter to the soil trap. The transport unit can be arranged to push or draw soil caught at the filter surface over the filter surface and into the soil trap. The transport unit can be arranged to push the soil by flushing a fluid substantially parallel to the filter surface towards the soil trap. The fluid can for example be the washing liquid, fresh water or a combination thereof. The fluid will follow the soil into the soil trap. Nozzles can be arranged at the periphery of the filter, directed towards the inlet of the soil trap. The transport unit can alternatively be arranged as a mechanical scraper.
- The soil removing unit can further comprise a filter cleaning unit, arranged to release soil from the filter such that it is more easily caught by the transport unit. The filter cleaning unit can be arranged to force fluid through the filter in a direction opposite to the circulation flow direction for releasing soil. The fluid can for example be the washing liquid, fresh water or combinations thereof.
- Additionally or alternatively, the filter cleaning unit can be arranged to provide air or gas bubbles through the filter. The main part of the filter is then preferably located below the washing liquid level in the dishwasher and the filter cleaning unit comprises air or gas outlets arranged for providing bubbles through the filter in a direction opposite the direction of the circulation flow. Bubbles through the filter are advantageous also due to that the bubbles initiate vibrations to the filter, which will loosen soil from the filter.
- The filter cleaning unit can alternatively or in addition to the bubbles comprise other vibration means for loosening of soil particles, for example biased, such as spring loaded agitating devices or devices imparting oscillating forces to the filter.
- The soil removing can be performed continuously, pulsed or at predetermined intervals. To indicate the need for soil removal, a pressure sensor can for example be arranged in the dishwasher, for example at the circulation pump, to indicate a pressure build up due to filter clogging, whereby soil removal can be initiated. The soil removing unit can also be activated at predetermined intervals. Preferably, the filter cleaning unit is activated just before the transport unit, whereby soil particles are first loosened from the filter and then transported to the soil trap.
- The soil trap is preferably located separate from the circulation flow of washing liquid, whereby the circulation flow is not guided into the soil trap. Instead, the circulation flow is guided to the circulation pump via a sump. The sump is a container at the bottom of the dishwasher, which container is connected to the circulation pump and to the drain of the dishwasher. The sump is arranged below a glass trap, which is a very coarse filter arranged to protect the circulation pump from large particles like tooth picks or pieces of broken glass. The soil trap can preferably be a liquid-tight container for collecting the soil. The inlet of the soil trap can preferably be located at a position above a washing liquid level of the dishwasher. This is to let the soil fall by gravitation into the soil trap without tendency to float out of it. The inlet of the soil trap placed above the washing liquid level does further prevent the circulation flow from entering the soil trap. The circulation flow can then be recirculated via the sump, without any need of refill of washing liquid. Alternatively, if the flow of washing liquid into the soil trap results in a lowered washing liquid level in the sump, the washing liquid can be refilled to keep a desired washing liquid level. The outlet of the soil trap is connected to the drain of the dishwasher.
- The circulation flow refers to the main part of the washing liquid, which is circulated by the circulation pump. In an alternative embodiment, the soil trap is a permeable or a semi-permeable container arranged separate from the circulation flow, for example a fine-mesh container. The fluid of the transport unit, which has followed the soil into the soil trap, can then leak out through the wall of the soil trap and be conveyed into the sump. This is advantageous in that the liquid level in the soil trap would be self regulating at a low level. However, in such embodiments of the invention, there is a minor, auxiliary circulation flow through the soil trap.
- The washing liquid level in the dishwasher refers to the normal level of washing liquid in the dishwasher during normal operation of the circulation pump. However, periods, preferably shorter, of higher washing liquid levels, where washing liquid is allowed to flow into the soil trap, could be acceptable.
- For control of the level of soil and washing liquid, valves can be arranged at the sump and at the outlet of the soil trap. The valves are open during drainage and closed during circulation or any other non-drainage situations during the dishwashing. The valves can alternatively be replaced by a drain pump, which is then turned on and off correspondingly to the opened and closed valves. The valves can be individually controlled. Alternatively, only one of the valves is replaced by the drain pump.
- The soil trap can further comprise a return flow inhibitor to prevent reflow of soil out of the soil trap and back into the circulation flow. The return flow inhibitor can for example be a hopper or funnel shaped trap device, downwards directed flanges, a screening sheet or a valve. The filter of the present invention can be a net, a fabric or a grating, but as the filter of the present invention is cleaned frequently, it can also, preferably, be a fine-mesh filter. In a dishwasher according to the prior art, the flow is divided to flow through a fine-mesh filter and a coarse-mesh filter, as described above in the background art section. By filtering the circulation flow only through a fine-mesh filter, and frequently or regularly remove the soil caught at the filter to prevent clogging of the filter, the recirculated washing liquid is more completely cleaned. Thus, the cleaning efficiency of the filter and the operation reliability of the dishwasher according to the invention is improved.
- The filter surface comprises a filter edge which can be arranged in connection to the inlet of the soil trap, whereby soil can be transferred by the transport unit from the filter surface and tip over the edge into the soil trap. The surface of the filter can also be inclined sloping downward away from the inlet of the soil trap, such that the filter edge proximal to the soil trap is raised relative the distal end to let the edge of the filter be above the washing liquid level as described above. Alternatively the surface of the filter can be plane or be inclined such that the distal end of the filter is raised relative the edge proximal to the soil trap.
- The filter can be located completely or partly under the washing liquid level of the dishwasher. It is also possible to have the circulation flow passing through the filter above the washing liquid level of the dishwasher.
- The filter can be one integral unit or comprise several subfilters. The shape of the filter can be circular, triangular, rectangular, or combinations thereof. The surface of the filter can be flat or curved. The filter can be built up by several subfilters into the shape of for example a truncated pyramid or cone.
- The soil trap can be arranged in the centre of the sump or at one edge. The soil trap can be surrounded by filter surfaces, or the soil trap can be arranged to one side of the filter. The soil trap can be extended along the filter edge and/or centred between two filter surfaces.
-
FIG. 1 is a perspective view of a dishwasher according to a preferred embodiment of the invention. -
FIG. 2 is a sectional perspective view of a part of a dishwasher according to an embodiment of the invention. -
FIG. 3 is a sectional view of the part ofFIG. 2 , additionally showing the level of washing liquid and soil. -
FIG. 4 is a schematic diagram of flows according to an embodiment of the invention. -
FIG. 5 is a sectional perspective view of a part of a dishwasher according to an alternative embodiment of the invention. -
FIG. 6 is a sectional perspective view of a part of a dishwasher according to another alternative embodiment of the invention. -
FIG. 1 is a schematic perspective view of an embodiment of adishwasher 1 according to the invention. Thedishwasher 1 includes awashing chamber 3,baskets 5 to hold soiled items to be washed, aspray arm 7 and aglass trap 9 arranged above asump 17. -
FIG. 2 is a sectional perspective view of a part of adishwasher 1 according to an embodiment of the invention, showing aglass trap 9, afilter 11, asoil trap 15 and asump 17. Theglass trap 9 is a very coarse filter, in this example a plane surface covered with regularly distributedcircular holes 10. Underneath theglass trap 9 there is arranged a fine-mesh filter 11. Thefilter 11 has the shape of a truncated cone with its centre part raised relatively its periphery part. In the centre of thefilter 11, thesoil trap 15 is located. The filter comprises a filter surface having a filter edge and the inlet of the soil trap is arranged abutting against the filter edge. - The
soil trap 15 is a liquid-tight cylinder with its upper end at the level of the filter surface and itslower end 19 connected to adrain 20, c.f.FIG. 4 . Thesoil trap 15 is on its inner cylinder surface provided with tworeturn flow inhibitors 21 in the form of hopper-shaped trap devices. On the upper end of thesoil trap 15, there is provided ahandle 23 for gripping thesoil trap 15 at removal, in case of a desired cleaning. - The dishwasher further comprises a soil removing unit comprising a
transport unit 25 and afilter cleaning unit 26. Thetransport unit 25 is in this embodiment nozzles 27 for water jets arranged in atube 29, which is attached at the periphery of thefilter 11. Thenozzles 27 are directed parallel to the surface of thefilter 11 towards thesoil trap 15. Thetube 29 with thenozzles 27 is connected to a water source (alternatively to the circulation flow). The nozzles can alternatively be provided in the wall at the periphery of the filter. - The
filter cleaning unit 26 is arranged to clean thefilter 11 fromsoil 31 that is stuck or adhered to the surface of thefilter 11. Thefilter cleaning unit 26 shown inFIG. 2 andFIG. 3 comprises threeperforated tubes tubes filter 11. Thetubes - The
sump 17 is arranged underneath theglass trap 9 and is surrounding the cylinder shapedsoil trap 15. At the lower part of thesump 17 there is provided two outlets, onecirculation outlet 35 connected to thecirculation pump 37 and onedrain outlet 39 connected to thedrain 20. Thedrain outlet 39 is arranged at the bottom level of thesump 17 to assure that the dishwasher can be completely drained. - An example of the operation of an embodiment of a dishwasher will now be described with reference to
FIG. 1 ,FIG. 2 ,FIG. 3 andFIG. 4 .FIG. 3 is a sectional view of thedishwasher 1 as shown inFIG. 2 , further showing theliquid levels soil particles 31. - As a start, the user places soiled items to be washed in the
baskets 5 of thedishwasher 1, closes the front and starts the dishwasher. - The components of the washing liquid, water and dishwasher detergents, enters to the
sump 9 with aninlet flow 44 through aninlet 45. The dishwasher is, to a predetermined level, filled up with the washing liquid. Thereafter thecirculation pump 37 creates acirculation flow 43 of the washing liquid through thewashing chamber 3 via thespray arm 7, pass the soiled items, into thesump 17, through thefilter 11 and back to thewashing chamber 3. - During circulation in the
dishwasher 1, the items placed in thewashing chamber 3 are cleaned by theflow 43 of washing liquid. Theflow 43 of washing liquid passes through thewashing chamber 3 andsoil 31 is released from the items to be washed and caught in theflow 43. Theglass trap 9 at the bottom of thewashing chamber 3 protects thecirculation pump 37 from larger particles like tooth picks or pieces of broken glass. When theflow 43 of washing liquid withsoil 31 passes through thefilter 11, after having passed theglass trap 9,soil 31 is caught at thefilter 11 and separated from theflow 43 of washing liquid. - Regularly during the circulation, at predetermined intervals, the
soil removing unit soil 31 from thefilter 11 and transports thesoil 31 into thesoil trap 15. Just before a transporting water flush by thetransport unit 25, thefilter cleaning unit 26 flushes air, generating bubbles, which bubbles transfers up through thefilter 11 in a direction which is opposite to the direction of the circulation flow and releases stuck and adheredsoil 31 from thefilter 11. This is partly due to vibrations imparted to the filter by the passing bubbles. The amount of generated bubbles and the length of the time periods at which they are released, is adapted such that the circulation flow maintains a flow rate which is acceptable for the cleaning operation. - Subsequently, the
nozzles 27 of thetransport unit 25 flushes water during a limited period of time, wherebysoil 31 is transferred from thefilter 11, over the filter surface, over the filter edge and falls by gravity into thesoil trap 15. - The
soil trap 15 is located separate from thecirculation flow 43, and is arranged to collectsoil 31 and keep thesoil 31 separate from thecirculation flow 43. Thesoil trap 15 is provided withreturn flow inhibitors 21, in the shape of hopper shaped trap devices, which counteracts a reflow ofsoil 31 back into thecirculation flow 43. - In this embodiment, the major part of the filter surface is located under the
washing liquid level 41 in thesump 17 of the dishwasher. Consequently, thenozzles 27 are arranged to push the soil over the filter surface across a simultaneous circulation flow through the filter surface. - For control of the
washing liquid level 41 in the and theliquid level 42 in thesoil trap 15, onevalve 53 is arranged at thedrain outlet 39 of thesump 17 and onevalve 55 is arranged at the bottom of thesoil trap 15. If theliquid level 42 in thesoil trap 15 reaches a predetermined highest level,soil 31 and washing liquid is drained from thesoil trap 15 by opening of thevalve 55. Thesoil 31 and the washing liquid in thesoil trap 15 is then drained in asoil flow 47. - The
valves closed valves valves - The
circulation flow 43 that has entered thesump 17 and passed thefilter 11, then recirculates by thecirculation pump 37 back into thewashing chamber 3. - When the washing operation is finished, the
sump 17 and thesoil trap 15 are drained through thedrain 20, by opening of thevalves 53, 55 (or alternatively by turning the drain pump on). - Finally the user opens the front of the dishwasher and removes the items from the baskets, which items now are cleaned from soil.
- Alternative embodiments of the invention are shown in
FIG. 5 andFIG. 6 . Only the divergence from the previously shown embodiment will be described here. - In
FIG. 5 thetubes filter cleaning unit 26 inFIG. 2 andFIG. 3 has been replaced by a perforated hollow ring-shapedplate 51. The perforations are nozzles, directed towards the under side of the filter. Just as for thetubes - In
FIG. 6 the shapes of theglass trap 9, thefilter 11, the extension of thetubes sump 17, thesoil trap 15 and thereturn flow inhibitors 21 are altered from circular to rectangular. Theglass trap 9 and the fine-mesh filter 11 are of a flat, rectangular shape. The fine-mesh filter 11 is inclined with its raised edge adjacent to the inlet of thesoil trap 15. Thesoil trap 15 is a container with a rectangular through-cut. Thesump 17 is located at on one side of thesoil trap 15. Thetubes return flow inhibitors 21 are in the shape of flanges directed downwards. The function is as described with reference to the circular design, described with reference toFIG. 1-4 . - Although described with reference to a preferred embodiment of the present invention, it should be readily apparent to one of ordinary skill in the art that various changes and/or modifications can be made without departing from the scope of the invention as set forth in the accompanying claims. In general, the invention is only intended to be limited to the following claims.
Claims (15)
1. A dishwasher, comprising a washing chamber arranged for holding soiled items to be washed, a filter, a circulation pump, which is operable to create a circulation flow of washing liquid through the washing chamber, through the filter and back to the washing chamber, wherein the washing chamber is such arranged that, when the flow of washing liquid passes through the washing chamber, soil is released from the items to be washed and caught in the flow, and wherein the filter is such arranged that, when the flow of washing liquid with soil passes through the filter, soil is separated from the flow of washing liquid and caught at the filter, wherein the dishwasher further comprises a soil trap, which is located separate from the circulation flow, and a soil removing unit comprising a transport unit for transport of the soil caught at the filter into the soil trap.
2. A dishwasher according to claim 1 , wherein the soil trap is a liquid-tight container for collecting soil.
3. A dishwasher according to claim 1 , wherein an inlet of the soil trap is located at a position above a washing liquid level of the dishwasher.
4. A dishwasher according to claim 1 , wherein the filter comprises a filter surface having a filter edge and an inlet of the soil trap arranged adjacent to that filter edge.
5. A dishwasher according to claim 4 , wherein the filter surface is inclined sloping downwards away from the inlet of the soil trap.
6. A dishwasher according to claim 1 , wherein the transport unit is arranged to push soil caught at the filter surface over the filter surface and into the soil trap.
7. A dishwasher according to claim 6 , wherein the transport unit is arranged to flush a fluid substantially parallel to the filter surface for transport of the soil in the fluid into the soil trap.
8. A dishwasher according to claim 1 , wherein the soil removing unit comprises a filter cleaning unit, which is arranged to release soil from the filter such that it is more easily caught by the transport unit.
9. A dishwasher according to claim 8 , wherein the filter cleaning unit is arranged to force fluid through the filter in a direction opposite to the circulation flow direction for releasing soil.
10. A dishwasher according to claim 8 , wherein the main part of the filter is located below the washing liquid level of the dishwasher during the major part of a circulation operation and wherein the filter cleaning unit comprises air or gas outlets arranged for providing bubbles through the filter in a direction opposite the direction of the circulation flow.
11. A dishwasher according to claim 1 , wherein the filter is a fine-mesh filter.
12. A dishwasher according to claim 1 , wherein the soil trap comprises a return flow inhibitor to prevent reflow of soil out of the soil trap and back into the circulation flow.
13. A dishwasher according to claim 12 , wherein the return flow inhibitor is a hopper shaped trap device.
14. A dishwasher according to claim 1 , wherein the soil trap is connected to a drain pump.
15. A dishwasher according to claim 1 , wherein the filter has the shape of a truncated cone and the inlet of the soil trap is a liquid-tight open cylinder located at the centre of the filter.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08018545.7 | 2008-10-23 | ||
EP08018545A EP2179685B1 (en) | 2008-10-23 | 2008-10-23 | Dishwasher |
PCT/EP2009/007408 WO2010046056A1 (en) | 2008-10-23 | 2009-10-15 | Dishwasher |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2009/007408 A-371-Of-International WO2010046056A1 (en) | 2008-10-23 | 2009-10-15 | Dishwasher |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US15/058,855 Continuation US9955847B2 (en) | 2008-10-23 | 2016-03-02 | Dishwasher |
Publications (1)
Publication Number | Publication Date |
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US20110226289A1 true US20110226289A1 (en) | 2011-09-22 |
Family
ID=40202920
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US13/121,510 Abandoned US20110226289A1 (en) | 2008-10-23 | 2009-10-15 | Dishwasher |
US15/058,855 Expired - Fee Related US9955847B2 (en) | 2008-10-23 | 2016-03-02 | Dishwasher |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/058,855 Expired - Fee Related US9955847B2 (en) | 2008-10-23 | 2016-03-02 | Dishwasher |
Country Status (5)
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US (2) | US20110226289A1 (en) |
EP (1) | EP2179685B1 (en) |
CN (1) | CN102215729B (en) |
AU (1) | AU2009306754B2 (en) |
WO (1) | WO2010046056A1 (en) |
Cited By (9)
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US20120186609A1 (en) * | 2011-01-21 | 2012-07-26 | Bsh Bosch Und Siemens Hausgerate Gmbh | Dishwasher |
US20140209130A1 (en) * | 2013-01-31 | 2014-07-31 | Carl Runge | Mobile sanitary wash system and apparatus |
US20150246377A1 (en) * | 2012-09-28 | 2015-09-03 | Dow Global Technologies Llc | Washing maching including integral filter module and aerator |
USD776372S1 (en) | 2014-06-05 | 2017-01-10 | Wolf Appliance, Inc. | Dishwasher tub bottom |
US9655494B2 (en) | 2014-06-05 | 2017-05-23 | Wolf Appliance, Inc. | Dishwasher filtration system |
USD840117S1 (en) | 2016-09-23 | 2019-02-05 | Wolf Appliance, Inc. | Dishwasher water softener cap |
USD842558S1 (en) | 2016-09-23 | 2019-03-05 | Wolf Appliance, Inc. | Dishwasher filter cap |
AU2017307903B2 (en) * | 2016-08-04 | 2020-02-06 | Lg Electronics Inc. | Dish washer |
USD900417S1 (en) * | 2013-10-29 | 2020-10-27 | Whirlpool Corporation | Sprayer for dish washing machine |
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EP2499954B1 (en) * | 2011-03-17 | 2017-05-10 | Electrolux Home Products Corporation N.V. | Dishwasher with a bistable filter |
AU2012326378B2 (en) * | 2011-10-20 | 2015-05-21 | Premark Feg L.L.C. | Ware washer with at least one washing system realized as a recirculating circuit |
EP2844125A1 (en) * | 2012-05-04 | 2015-03-11 | Arçelik Anonim Sirketi | A dishwasher comprising a filter |
CN113576364A (en) * | 2015-02-13 | 2021-11-02 | 菲舍尔和佩克尔应用有限公司 | Washing system of washing electric appliance |
CN105080880B (en) * | 2015-08-10 | 2018-08-17 | 卢小平 | Filter device and rinse bath with the filter device |
CN109394110B (en) * | 2017-08-18 | 2024-02-20 | 宁波方太厨具有限公司 | Cleaning machine |
CN109394109B (en) * | 2017-08-18 | 2024-01-16 | 宁波方太厨具有限公司 | Cleaning machine |
CN109394130B (en) * | 2017-08-18 | 2024-01-16 | 宁波方太厨具有限公司 | Cleaning machine |
CN109394131B (en) * | 2017-08-18 | 2024-01-16 | 宁波方太厨具有限公司 | Cleaning machine |
CN109589066B (en) * | 2017-09-30 | 2024-01-16 | 宁波方太厨具有限公司 | Cleaning machine |
CN107854081A (en) * | 2017-11-24 | 2018-03-30 | 佛山市顺德区美的洗涤电器制造有限公司 | Water tank type dish-washing machine |
US10893791B2 (en) * | 2018-07-19 | 2021-01-19 | Whirlpool Corporation | Dishwasher and sump assembly |
DE102019206978B4 (en) * | 2019-05-14 | 2020-12-17 | Meiko Maschinenbau Gmbh & Co. Kg | Dishwasher for use in a means of transport |
WO2020247538A1 (en) * | 2019-06-03 | 2020-12-10 | Ecolab Usa Inc. | Dishwasher sump and dishwasher apparatus |
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Cited By (14)
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---|---|---|---|---|
US20120186609A1 (en) * | 2011-01-21 | 2012-07-26 | Bsh Bosch Und Siemens Hausgerate Gmbh | Dishwasher |
US10004377B2 (en) * | 2011-01-21 | 2018-06-26 | BSH Hausgeräte GmbH | Dishwasher |
US20150246377A1 (en) * | 2012-09-28 | 2015-09-03 | Dow Global Technologies Llc | Washing maching including integral filter module and aerator |
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USD900417S1 (en) * | 2013-10-29 | 2020-10-27 | Whirlpool Corporation | Sprayer for dish washing machine |
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USD776372S1 (en) | 2014-06-05 | 2017-01-10 | Wolf Appliance, Inc. | Dishwasher tub bottom |
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USD840117S1 (en) | 2016-09-23 | 2019-02-05 | Wolf Appliance, Inc. | Dishwasher water softener cap |
USD842558S1 (en) | 2016-09-23 | 2019-03-05 | Wolf Appliance, Inc. | Dishwasher filter cap |
Also Published As
Publication number | Publication date |
---|---|
US9955847B2 (en) | 2018-05-01 |
EP2179685A1 (en) | 2010-04-28 |
CN102215729B (en) | 2013-10-16 |
AU2009306754A1 (en) | 2010-04-29 |
US20160198929A1 (en) | 2016-07-14 |
EP2179685B1 (en) | 2013-01-09 |
CN102215729A (en) | 2011-10-12 |
WO2010046056A1 (en) | 2010-04-29 |
AU2009306754B2 (en) | 2013-10-24 |
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Legal Events
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AS | Assignment |
Owner name: ELECTROLUX HOME PRODUCTS CORPORATION, N.V., BELGIU Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FORSTER, SARAH;REEL/FRAME:026428/0116 Effective date: 20110608 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |