EP0913119B1 - Shunt drain system - Google Patents
Shunt drain system Download PDFInfo
- Publication number
- EP0913119B1 EP0913119B1 EP19980117020 EP98117020A EP0913119B1 EP 0913119 B1 EP0913119 B1 EP 0913119B1 EP 19980117020 EP19980117020 EP 19980117020 EP 98117020 A EP98117020 A EP 98117020A EP 0913119 B1 EP0913119 B1 EP 0913119B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- drain
- pump
- shunt
- wash liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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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
- A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
- A47L15/4225—Arrangements or adaption of recirculation or discharge pumps
- A47L15/4227—Arrangements or adaption of recirculation or discharge pumps with macerator arrangements for chopping entrained food particles
-
- 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
Description
- The present invention generally relates to washers and, more particularly, to shunt drain systems for washers having separate sump chambers.
- Washers, particularly domestic dishwashers, rely on a combination of filtration and diluition to remove food and detergent or soil particles from wash liquid or water which is recirculated to spray arms to wash dishes or other objects to be cleaned. Filtration of the wash liquid removes all of the soil particles larger than the holes in the filtering media, but cannot remove dissolved soil particles smaller than the holes in the filtering media. Diluition of the wash liquid however, does remove the dissolved soil particles which are not removed by filtration. Diluition requires removing as much of the wash liquid from the dishwasher during each pump-out or drain phase as possible so that it can be replaced with fresh water.
- Dishwashers commonly have a sump with separate chambers for holding the wash liquid such as, for example, a first chamber for collecting soil particles removed from the wash liquid and a second chamber for holding filtered or "clean" wash liquid to be recirculated to the spray arms. The contents of each chamber must eventually be pumped to a household drain.
- A dishwasher with dual pumps and separate chambers is known from US 5,320,120: the drain system includes a conduit which directly, i.e. in series, connects the recirculation sump with the drain pump and then to the collection chamber; the drain pump is located in between the recirculation sump and the collection chamber, and therefore upstream this latter. A one-way valve is also located in between the recirculation sump and the collection chamber.
- Another dishwasher with dual pumps and separate chambers is known from GB 1,151,958: the two portions of the discharge chute constituting, respectively, the recirculation sump and the collection chamber are contiguously positioned and mutually separated by a non-return flap valve that connects the two portions. The non-return flap valve is moved between an open and a closed position in response to a pressure difference between the recirculation sump and the collection chamber.
- In most known dishwasher configurations some wash liquid is trapped within the sump which reduces the effectiveness of the diluition process. For example, a dishwasher having a circulation pump separating the first and second chambers, for pumping wash liquid from the second chamber to the spray arms, and a separate drain pump connected to the first chamber, for pumping the contents of each chamber to the drain, often does not remove all of the wash liquid from the second chamber. To remove all of the wash liquid from the second chamber, the drain pump must first draw the wash liquid from the second chamber into the first chamber through a restricted passage formed by the pump. The passage must be restricted in order to substantially prevent the migration of soil particles from the first chamber to the second chamber. Because of the restriction, however, the drain pump quickly drains all of the wash liquid from the first chamber and breaks prime (air enters the volute) as soon as all of the wash liquid is removed from the first chamber. The performance of the drain pump drops off significantly once it breaks prime and, as a result, most of the wash liquid in the second chamber is left in the second chamber after the drain phase is complete.
- Accordingly, there is a need in the art for a washer having an improved drain system wherein substantially all of the contents of the sump are removed from both the soiled and the clean chambers during the drain phase of operation. Additionally, the drain system should substantially prevent the migration of soil particles from the soiled chamber to the clean chamber. Furthermore, the drain system should be relatively inexpensive to produce, be simple to assemble and repair, have a relatively small number of parts, and utilize relatively small pumps.
- The present invention provides a washer which overcomes at least some of the above-noted problems of the related art. According to the invention, the washer includes a circulation pump, a separate drain pump, a shunt drain system, and a tub forming a wash chamber and a sump. The sump has first and second sump chambers adapted to hold liquid from the wash chamber. The drain pump connects the first sump chamber and a drain line to move liquid from the first sump chamber to the household drain. The circulation pump is adapted to move liquid from the second sump chamber to the wash chamber. The shunt drain system is adapted to provide a direct path for the wash liquid from the second sump chamber to the drain pump, The shunt drain system includes a shunt drain conduit directly connecting the second sump chamber with the drain pump and a shunt check valve in the shunt drain conduit movable between a closed position and an open position. The shunt drain conduit provides a good, generally restriction free connection between the second sump chamber and the drain pump so that the drain pump can simultaneously draw wash liquid from both the first and second sump chambers which are each directly connected to the drain pump inlet. The shunt drain conduit also allows wash liquid to be removed, although at a reduced rate, from the second sump chamber after the first sump chamber is empty and the drain pump loses prime.
- According to another aspect of the invention, the shunt check valve is moved between the open and closed positions in response to a pressure difference between the second sump chamber and the shunt drain conduit. In a preferred embodiment, the shunt check valve is held in the closed position when the circulation pump is operating by a lower pressure in the second sump chamber than in the shunt drain conduit. The shunt check valve is preferably held in the closed position when both the circulation pump and the drain pump are operating by a lower pressure in the second sump chamber than in the shunt drain conduit. The shunt check valve is also preferably held in the open position when the circulation pump is not operating and the drain pump is operating by a lower pressure in the shunt drain conduit than in the second sump chamber.
- These and further features of the present invention will be apparent with reference to the following description and drawings, wherein:
- FIG. 1 is an elevational view, partially in cross-section, of a washing apparatus according to the present invention having a circulation pump and a drain pump;
- FIG. 2 is an elevational view, partially in cross-section, of a portion of the washing apparatus of FIG. 1 during a wash phase, wherein the circulation pump is operating and the drain pump is off;
- FIG. 3 is an elevational view similar to FIG. 2 but during an initial portion of a drain phase, wherein both the circulation pump and the drain pump are operating;
- FIG. 4 is an elevational view similar to FIG. 3 but during the drain phase, wherein the circulation pump is off and the drain pump is operating; and
- FIG. 5 is an elevational view similar to FIG. 4 but during a final portion of the drain phase, wherein a first sump chamber is completely drained and the drain pump has lost full prime.
-
- FIGS. 1 and 2 illustrate a washer or
washing apparatus 10, more particularly a domestic dishwasher, having ashunt drain system 11 according to the present invention. Thewashing apparatus 10 includes a moldedplastic tub 12 having asump 14 at a lower end thereof. Thesump 14 collects and holds wash liquid that is sprayed fromspray arms 16 onto objects stored onracks 18 inside awash chamber 20. Gravity forces wash liquid to fall into thesump 14 from thewash chamber 20. Afine filter 22 having a sloped, generallyhorizontal filter component 24 and an annularvertical filter component 26 is disposed between thesump 14 and thewash chamber 20. Thefine filter 22 is preferably a molded mesh screen having 4 mm (.015 in.) openings therein. - An
inner wall 28 of thesump 14 and thevertical filter component 26 separate thesump 14 into afirst chamber 30, referred to hereafter as the collection or macerator chamber, and asecond chamber 32, referred to hereafter as the pump or "clean water" chamber. Thefine filter 22 and theinner wall 28 isolate thepump chamber 32 from thewash chamber 20. - Wash liquid flows downwardly from the
wash chamber 20 and into thepump chamber 32 through thehorizontal filter component 24. Food soils orparticles 34 in the wash liquid are filtered out by thefine filter 22 as the wash liquid enters thepump chamber 32. Thehorizontal filter component 24 is sloped downwardly toward thecollection chamber 30 to "funnel" thefood particles 34 into thecollection chamber 30.Food particles 34 are retained in thecollection chamber 30 and macerated therein as described in more detail hereafter. When the liquid level in thecollection chamber 30 is high enough, some of the wash liquid in thecollection chamber 30 flows into thepump chamber 32 through thevertical filter component 26. - In the illustrated embodiment of the invention, the
horizontal filter component 24 is located directly below thespray arm 16 and spray nozzles orjets 36 are provided on thespray arm 16 to clean thefine filter 22. Thespray nozzles 36 are adapted to direct wash liquid at thehorizontal filter component 24 and topropel food particles 34 located on thehorizontal filter component 24 into thecollection chamber 30. It is noted that other filter and wall arrangements which filter food particles from wash liquid entering a pump chamber and collect the food particles in a collection chamber can be utilized within the scope of the present invention. - The
collection chamber 30 has an exit port oroutlet 38 in communication with an inlet of adrain pump 40 so that wash liquid andfood particles 34 within thecollection chamber 30 can be pumped to a household drain (not specifically shown). A drain hose orconduit 42 connects thecollection chamber outlet 38, which is located at the bottom of thecollection chamber 30, with the inlet of thedrain pump 40. Preferably, the inlet of thedrain pump 40 is located at a position lower than thecollection chamber outlet 38. A drain line orpipe 44, preferably having a high loop, connects the outlet of thedrain pump 40 with the household drain. - The
drain pump 40 is a small synchronous centrifugal pump and includes animpeller 46 secured to ashaft 48 driven by anelectric motor 50. Thedrain pump impeller 46 moves wash liquid and minced food particles from thecollection chamber 30 to the household drain through thedrain conduit 42. Thedrain pump 40 also includes adrain check valve 52 located at the inlet of thedrain pump 40. Thedrain check valve 52 allows flow only in one direction, toward the household drain, to prevent reverse flow back into thedrain conduit 42. Thedrain check valve 52 can alternatively be located between the outlet of thedrain pump 40 and the household drain. - The
pump chamber 32 has a first exit port oroutlet 54 in communication with an inlet of acirculation pump 56 so that wash liquid can be recirculated from thesump 14 to thewash chamber 20 and a second exit port oroutlet 58 in communication with thedrain pump 40 so that any wash liquid remaining in thesump 14 can be pumped to the household drain. Thefirst outlet 54 of thepump chamber 32 is located at the lower end of thepump chamber 32 and the wash liquid enters thecirculation pump 56 in a generally horizontal direction.Conduits circulation pump 56 with thespray arms 16. - The
circulation pump 56 is a synchronous centrifugal pump, preferably larger than thedrain pump 40, and includes animpeller 64 secured to ashaft 66 driven by anelectric motor 68. Thecirculation pump impeller 64 moves wash liquid from thepump chamber 32 to thespray arms 16 through theconduits blade 70 is disposed on theshaft 66 of thecirculation pump 56 within thecollection chamber 30. Theblade 70 is made from a hard, corrosion resistant material, such as stainless steel or aluminum. Theblade 70 has sharp edges that chopfood particles 34 located in thecollection chamber 30. The edges of theblade 70 can be angled slightly from the plane in which theblade 70 rotates to circulate wash liquid and food particles within thecollection chamber 30 for more efficient mincing. Theblade 70 is rotated by theshaft 66 whenever thecirculation pump 56 is operating. - Circulation created by the
blade 70 and the rotation of theshaft 66 can cause wash liquid to migrate or flow toward thecirculation pump 56 around theshaft 66. Therefore, aseal 72, such as the illustrated labyrinth seal, and/or balancing vanes on a rear face of thecirculation pump impeller 64 are provided to prevent such migration or flow. Thecirculation pump 56 does form a restricted flow passage between thepump chamber 32 and thecollection chamber 30 through which thedrain pump 40 draws wash liquid during a drain phase of operation. The wash liquid flows through the clearance around theimpeller shaft 66 which is very tight and does not allow the wash liquid to leak into thecollection chamber 30 very fast. - The
shunt drain system 11 includes thesecond outlet 58 of thepump chamber 32, a shunt drain hose orconduit 74, and ashunt check valve 76. Thesecond outlet 58 of thepump chamber 32 is located at the bottom of thepump chamber 32 and at the lowest point of thepump chamber 32. Thesecond outlet 58 is spaced-apart from thefirst outlet 54 as described in more detail hereafter. Theshunt drain conduit 74 connects thesecond outlet 58 with thedrain conduit 42 so that thesecond outlet 58 is in communication with the inlet of thedrain pump 40. Therefore, both thecollection chamber 30 and thepump chamber 32 are directly connected to the inlet of thedrain pump 40. Preferably, the inlet of thedrain pump 40 is located at a position lower than thesecond outlet 58 of thepump chamber 32. Thedrain pump impeller 46 simultaneously moves wash liquid from thepump chamber 32 to the household drain through theshunt drain conduit 74 and thedrain conduit 42 and from thecollection chamber 30 to the household drain through thedrain conduit 42. - The
shunt check valve 76 is provided in theshunt drain conduit 74 to prevent macerated and/or dissolved food particles from migrating from thecollection chamber 30 to thepump chamber 32. Theshunt check valve 76, therefore, prevents thefood particles 34 from bypassing the filtration system. Theshunt check valve 76 preferably operates in response to a pressure difference between thepump chamber 32 and theshunt conduit 74. Theshunt check valve 76, however, can be actuated in other manners such as, for example, an electric signal to an electro-mechanical valve. - The
shunt check valve 76 of the illustrated embodiment is directly located at thesecond outlet 58 of thepump chamber 32 and includes avalve seat 78 and avalve element 80 which cooperates with thevalve seat 78 to form a tight seal therebetween. Thevalve element 80 is movable and pivots between an open position and a closed position. Thevalve element 80 is oriented to open when wash liquid flows through thevalve seat 78 from thepump chamber 32 to theshunt drain conduit 74. - When the
circulation pump 56 is operating and thedrain pump 40 is not operating, low pressure within thepump chamber 32 holds thevalve element 80 in the closed position to prevent migration offood particles 34 into thepump chamber 32. Note that the high velocity wash liquid flowing to thecirculation pump 56 within thepump chamber 32 causes lower static pressure over the top of the valve element 80 (within the pump chamber 32) than the static pressure under the bottom of the valve element 80 (within the shunt drain conduit 74). When thecirculation pump 56 is not operating and thedrain motor 40 is operating, low pressure in theshunt drain conduit 74 pulls thevalve element 80 to the open position to draw wash liquid from thepump chamber 32 to thedrain pump 40 through theshunt drain conduit 74. Note that wash liquid flowing into thedrain pump 40 causes lower static pressure under the bottom of the valve element 80 (within the shunt drain conduit 74) than the static pressure over the top of the valve element 80 (within the pump chamber 32). When both the circulation and drain pumps 56, 40 are operating, there is preferably a slight pressure differential holding thevalve element 80 in the closed position so that wash liquid is quickly drawn from thecollection chamber 30 rather than from thepump chamber 32. This allows the spray system to keep operating for a period of time sufficient for thespray jets 36 to clear thehorizontal filter component 24 offood particles 34 which would otherwise remain on thefine filter 22. - The distance between the first and
second outlets 54, 58'of thepump chamber 32 must be large enough so that the pressure differential is not too high. If the pressure differential is too high, thevalve element 80 could be pulled through thevalve seat 78 so that thevalve element 80 will not properly pivot to the open position when required. The distance between the first andsecond outlets pump chamber 34, however, must be small enough so that the pressure differential is adequate to properly seat and hold thevalve element 80 in the closed position when required. - Operation of the
washing apparatus 10 typically includes at least one wash phase and at least one drain phase. As best shown in FIG. 2, during the wash phase thecirculation pump 56 is operating and thedrain pump 40 is not operating. Wash liquid in thepump chamber 32 of thesump 14 is drawn into thecirculation pump 56 and pumped through theconduits spray arms 16 onto objects being washed which are stored on theracks 18 within thewash chamber 20. After the wash liquid strikes the objects, wash liquid andfood particles 34 fall downwardly to thefine filter 22. The wash liquid flows downwardly through thefine filter 22, which filters outfood particles 34. The filtered wash liquid flows into thepump chamber 32, from where it is recirculated to the washarms 16 by thecirculation pump 56. - The filtered
food particles 34 tend to move down the slopedhorizontal component 24 of thefine filter 26 toward thecollection chamber 30. Additionally, thespray jets 36 of thespray arms 16 propel thefood particles 34 located on thehorizontal filter component 24 into thecollection chamber 30. Wash liquid, containingfood particles 34, that does not flow through thefine filter 22 flows into thecollection chamber 30, where the food particles are collected.Food particles 34 located in thecollection chamber 30 are macerated by the wash liquid and chopped or minced by theblade 70 when thecirculation pump 56 is operating. Low pressure within thepump chamber 32 holds thevalve element 80 of theshunt check valve 76 in the closed position to prevent migration offood particles 34 from thecollection chamber 30 to thepump chamber 32. - When the wash phase is completed, the drain phase is initiated. As best shown in FIG. 3, the
drain pump 40 is energized so that initially both the circulation and drain pumps 56, 40 are operating. Thedrain pump 40 draws wash liquid, which carries food particles, from thecollection chamber 30 through thedrain conduit 42 and pumps the wash liquid and food particles to the household drain through thedrain pipe 44. Draining of thecollection chamber 30 continues until thecollection chamber 30 is nearly empty. Substantially all of thefood particles 34 are thereby discharged from thewashing apparatus 10. The slight pressure differential holds thevalve element 80 in the closed position so that wash liquid is quickly drawn from thecollection chamber 30 rather than from thepump chamber 32. - The
circulation pump 56 continues to operate so that wash liquid from thepump chamber 32 is recirculated to the spray arms. Therefore, thespray jets 36 continue to rinse food particles from thehorizontal filter component 24 which would otherwise remain on thefine filter 22 if thecirculation pump 56 was stopped when thedrain pump 40 was initiated. This "rinsing" effect has a very positive effect on soil particle removal and ultimately on wash performance. - As best shown in FIG. 4, the
circulation pump 56 is stopped during the drain phase so that only thedrain pump 40 is operating. Low pressure in theshunt drain conduit 74 pulls thevalve element 80 to the open position and thedrain pump 40 simultaneously draws wash liquid from bothchambers sump 14. Wash liquid is drawn from thepump chamber 32 through theshunt drain conduit 74 and thedrain conduit 42 and wash liquid is drawn from thecollection chamber 32 through thedrain conduit 42. Thedrain pump 40 moves the wash liquid and soil particles to the household drain through thedrain pipe 44. - As best shown in FIG. 5, when the
collection chamber 30 is completely drained, and thedrain pump 40 has lost full prime, the drain pump continues to draw wash liquid from thepump chamber 32, although at a slower rate. Once thepump chamber 32 is substantially empty and substantially all of the wash liquid and substantially all of the soil particles are removed from thewashing apparatus 10, thedrain pump 40 is stopped. - Although particular embodiments of the present invention have been described in detail, it is understood that the invention is not limited correspondingly in scope, but includes all changes and modifications coming within the scope of the claims appended hereto.
Claims (3)
- A dishwasher comprising:a tub (12) forming a wash chamber (20) and a sump (14), said sump (14) having macerating chamber (30) and pump chamber (32) each adapted to hold liquid from said wash chamber (20);a drain line (44);a drain pump (40) connecting said macerating chamber (30) and said drain line (44) to lead liquid from said macerating chamber (30) to said drain line (44);a circulation pump (56) separate from said drain pump (40) and adapted to lead liquid from said pump chamber (32) to said wash chamber (20);a shunt drain system (11) forming a flow path for liquid from said pump chamber (32) to said drain pump (40), said shunt drain system (11) including a shunt check valve (76) movable between a closed position and an open position in response to a pressure difference,
- The dishwasher according to claim 1, wherein said circulation pump (56) has a shaft (66) extending through said macerating chamber (30) and a blade (70) attached to said shaft (66) within said macerating chamber (30).
- The dishwasher according to claim 1, wherein said shunt check valve (76) is located at an outlet (58) of said pump chamber (32).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US95941397A | 1997-10-28 | 1997-10-28 | |
US959413 | 1997-10-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0913119A1 EP0913119A1 (en) | 1999-05-06 |
EP0913119B1 true EP0913119B1 (en) | 2003-09-24 |
Family
ID=25502026
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19980117020 Expired - Lifetime EP0913119B1 (en) | 1997-10-28 | 1998-09-09 | Shunt drain system |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0913119B1 (en) |
DE (1) | DE69818391T2 (en) |
ES (1) | ES2209023T3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105342536A (en) * | 2015-12-08 | 2016-02-24 | 佛山市顺德区美的洗涤电器制造有限公司 | Multiple residue breaking and filtering system for dish washing machine |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10164507A1 (en) * | 2001-12-28 | 2003-07-17 | Bsh Bosch Siemens Hausgeraete | Device and method for collecting dirty water in dishwashers |
WO2005104923A1 (en) * | 2004-05-05 | 2005-11-10 | Pramod Kumar | Dishwasher with movable water circulating pump |
DE102007017283B4 (en) | 2007-04-12 | 2009-01-29 | BSH Bosch und Siemens Hausgeräte GmbH | Device for blocking a fluid passage through a tubular part by means of a check valve, in particular in a domestic appliance |
DE102013110974A1 (en) | 2013-03-19 | 2014-09-25 | Hanning Elektro-Werke Gmbh & Co. Kg | Cleaning device for kitchen appliances and pump system |
CN113796811B (en) * | 2021-08-30 | 2023-06-30 | 追觅创新科技(苏州)有限公司 | Residual liquid treatment mechanism, drainage device and cleaning equipment |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH458648A (en) * | 1967-06-30 | 1968-06-30 | Bauknecht Gmbh G | Dishwasher with drainage shaft |
US5320120A (en) * | 1993-06-17 | 1994-06-14 | General Electric Company | Dishwasher with dual pumps |
US5762080A (en) * | 1997-01-24 | 1998-06-09 | White Consolidated Industries, Inc. | Dishwasher cycle pulsing pump out of collection chamber |
-
1998
- 1998-09-09 DE DE1998618391 patent/DE69818391T2/en not_active Expired - Lifetime
- 1998-09-09 EP EP19980117020 patent/EP0913119B1/en not_active Expired - Lifetime
- 1998-09-09 ES ES98117020T patent/ES2209023T3/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105342536A (en) * | 2015-12-08 | 2016-02-24 | 佛山市顺德区美的洗涤电器制造有限公司 | Multiple residue breaking and filtering system for dish washing machine |
CN105342536B (en) * | 2015-12-08 | 2019-02-15 | 佛山市顺德区美的洗涤电器制造有限公司 | The multiple disintegrating slag filtration system of dish-washing machine |
Also Published As
Publication number | Publication date |
---|---|
DE69818391D1 (en) | 2003-10-30 |
DE69818391T2 (en) | 2004-04-22 |
EP0913119A1 (en) | 1999-05-06 |
ES2209023T3 (en) | 2004-06-16 |
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