EP1105034B1 - Method for the separation of granules from a cleaning fluid mixture for cleaning objects placed in a warewasher and warewashingmachine with a granules separator - Google Patents
Method for the separation of granules from a cleaning fluid mixture for cleaning objects placed in a warewasher and warewashingmachine with a granules separator Download PDFInfo
- Publication number
- EP1105034B1 EP1105034B1 EP99925507A EP99925507A EP1105034B1 EP 1105034 B1 EP1105034 B1 EP 1105034B1 EP 99925507 A EP99925507 A EP 99925507A EP 99925507 A EP99925507 A EP 99925507A EP 1105034 B1 EP1105034 B1 EP 1105034B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- liquid
- granules
- collector
- mixture
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- 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
- A47L15/0002—Washing processes, i.e. machine working principles characterised by phases or operational steps
-
- 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
- A47L15/0094—Washing or rinsing machines for crockery or tableware cleaning with abrasive solid particles, e.g. by blasting the crockery with liquid containing granules
-
- 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
- A47L2601/00—Washing methods characterised by the use of a particular treatment
- A47L2601/18—Liquid and granule
Definitions
- This invention relates to a method and a device in a cleaning machine to clean goods using as a cleaning fluid either a liquid mixed with granules or the liquid itself only.
- the granules have a density higher than that of the liquid.
- the liquid can be any liquid with cleaning properties but usually consist of water with various additives to enhance and improve the cleaning properties.
- Goods in this context refer to the soiled objects that are to be cleaned. Goods could be any objects that require to be cleaned but usually refers to pots, pans and other kitchen and cooking utensils that are difficult to clean with traditional cleaning machines.
- the cleaning fluid is pumped by a primary pumping device in a primary flow from a tank and discharged under pressure against the goods disposed in a treatment chamber. If the goods are heavily soiled the cleaning fluid consists of a liquid mixed with granules. Less or normally soiled goods can be cleaned with liquid only. After having been discharged against the goods the cleaning fluid is allowed to flow back as a return flow into the tank from which it is re-circulated for as long as it is desired that the cleaning cycle should last. At the end of the cleaning operation it is necessary to flush the goods with a liquid without any granules in order to remove the granules from the goods. This is done by means of a secondary pumping device which pumps liquid only in a secondary flow.
- Cleaning machines functioning according to the principle described above exist, using various methods to separate the granules from the cleaning fluid.
- Such cleaning machines may have a partition of the tank which is kept free of granules by means of a sieve or deflector.
- EP-A-0016895 Another solution for the separation of granules from liquid is disclosed in EP-A-0016895 directed to a cleaning machine.
- the machine includes a cassette providing a magazine for the granules.
- the cassette is connected to the suction side of a pump through a valve-controlled opening. Through the opening either a mixture of liquid and granules or liquid only can be sucked.
- a further object of the invention is to provide through the design of said apparatus, a simple method for removing the collected granules from the machine. The objects are achieved by the method and washing machine defined in inpendent claims 1 and 7.
- this invention provides a separate secondary discharge pipe with nozzles designed specifically for the secondary flow, thus making it possible to reduce the size of the secondary pumping device which in turn lowers the manufacturing costs.
- This invention addresses these problems by offering a simple method of combining the separation and the collection of the granules, leaving the tank interior accessible for cleaning and also facilitating the cleaning of the granules themselves as well as the measuring of the amount of granules in the machine to see if more granules are needed.
- the cleaning machine comprises a treatment chamber 1 in which goods 2 are placed in a washing rack 3.
- First nozzles 4 in a first discharge pipe 5 are provided through which the cleaning agent is discharged under pressure against the goods.
- Below the treatment chamber 1 there is a tank 6 into which the cleaning agent is allowed to flow in a return flow from the treatment chamber 1.
- the primary flow of cleaning agent mixed with granules is taken by a primary pumping device 7 which discharges the cleaning agent into a first conduit 20 leading to the first discharge pipe 5.
- the secondary flow of cleaning agent without granules is taken by a secondary pumping device 18 and discharged through a second conduit 8 to a second discharge pipe 9 with a set of second nozzles 10.
- This secondary flow can be much smaller than the primary flow since it is not intended to clean the goods with granule mixed liquid but to flush the remaining granules off the goods, and the discharge pipe 9 with its second nozzles 10 is designed accordingly. However, less heavily soiled goods can be cleaned by the secondary flow with liquid only through the second nozzles 10. By starting either of the two pumping devices, it is possible to control the outgoing flow to be mixed, or not mixed with granules.
- a granule collector 11 In the bottom of the tank 6 there is placed a granule collector 11 in such a way that a space 16 is created below the collector.
- the granule collector 11 is perforated with holes small enough to catch granules and let liquid through. The collector 11 can be lifted out of the machine together with the collected granules thus leaving the interior of the tank 6 free from granules and easily accessible for cleaning purposes.
- a lower conduit 12 extends through a hole 17 in the bottom of the collector 11 and leads to the primary pumping device 7.
- a deflector 13 positioned above the hole in the collector bottom.
- the deflector 13 is connected to the collector at some distance above the bottom of the collector 11.
- the deflector 13 is integral with the collector 11.
- the primary pumping device 7 stops and the secondary pumping device 18 starts pumping liquid from the space 16 below the collector through a liquid receiving conduit 21. Since the collector is perforated and will not let granules through, the resulting outgoing flow will consist of liquid only.
- FIG 3 and FIG 4 a modification is made in the bottom of the collector 11. Above the bottom of the collector 11 there is a suction conduit 14 leading to the primary pumping device 7. The direction of the primary flow from the collector is upwards against the force of gravity which prevents granules from entering the primary pumping device 7 when it is not in operation. The working of the secondary flow is the same as described above with reference to FIG 1.
- the secondary flow of cleaning agent without granules is taken by the secondary pumping device through a large sieve 15 above the collector 11.
- the sieve 15 can be positioned in such a way that it does not impede the removal of the collector.
- the working of the primary flow is the same as described above with reference to FIG 3.
- the suction conduit 14 should be removable or hinged to swing out of the way.
- a coupling or joint 19 is then provided between a fixed section of the suction conduit 14 and a movable section.
Landscapes
- Cleaning By Liquid Or Steam (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
- Cleaning In General (AREA)
- Washing And Drying Of Tableware (AREA)
Abstract
Description
- This invention relates to a method and a device in a cleaning machine to clean goods using as a cleaning fluid either a liquid mixed with granules or the liquid itself only. The granules have a density higher than that of the liquid. The liquid can be any liquid with cleaning properties but usually consist of water with various additives to enhance and improve the cleaning properties. Goods in this context refer to the soiled objects that are to be cleaned. Goods could be any objects that require to be cleaned but usually refers to pots, pans and other kitchen and cooking utensils that are difficult to clean with traditional cleaning machines.
- The cleaning fluid is pumped by a primary pumping device in a primary flow from a tank and discharged under pressure against the goods disposed in a treatment chamber. If the goods are heavily soiled the cleaning fluid consists of a liquid mixed with granules. Less or normally soiled goods can be cleaned with liquid only. After having been discharged against the goods the cleaning fluid is allowed to flow back as a return flow into the tank from which it is re-circulated for as long as it is desired that the cleaning cycle should last. At the end of the cleaning operation it is necessary to flush the goods with a liquid without any granules in order to remove the granules from the goods. This is done by means of a secondary pumping device which pumps liquid only in a secondary flow.
- Cleaning machines functioning according to the principle described above exist, using various methods to separate the granules from the cleaning fluid. Such cleaning machines may have a partition of the tank which is kept free of granules by means of a sieve or deflector.
- An example of such a cleaning machine is disclosed in WO-A-84/03616 together with a corresponding method. Liquid only is drawn from a level above the surface of granules. A mixture of liquid and granules is drawn from the bottom of a tank in the cleaning machine.
- Another solution for the separation of granules from liquid is disclosed in EP-A-0016895 directed to a cleaning machine. The machine includes a cassette providing a magazine for the granules. The cassette is connected to the suction side of a pump through a valve-controlled opening. Through the opening either a mixture of liquid and granules or liquid only can be sucked.
- While these machines operate satisfactorily, they have one weakness in common insofar that they are difficult to clean at the end of a working shift. This is due to the fact that the granules remain in the tank in or around the separation device which makes access to cleaning the tank bottom difficult. In view of the increasing demands from users for improved hygienic properties of cleaning machines, some manufacturers have addressed this problem by supplying additional granule collectors in the treatment chamber instead of goods to enable users to remove the granules from the machine. Most machines, however, due to their design, are difficult to clean internally.
- Existing machines utilise the same discharge pipe and nozzles for the primary flow and for the secondary flow. One drawback is that a mechanical check valve device is required where the discharge pipes from the two pumps join. The secondary pumping device also has to be larger than otherwise necessary to make the secondary flow powerful enough to flush the granules off the good.
- Finally there is a risk of damage to or blockage of the primary pumping device if the liquid being sucked into the pump is too rich in granules when the pump starts.
- It is an object of the present invention to overcome the drawbacks of prior art machines and to provide a method and a device for the separation of granules from the cleaning fluid. A further object of the invention is to provide through the design of said apparatus, a simple method for removing the collected granules from the machine. The objects are achieved by the method and washing machine defined in
inpendent claims - Still further, this invention provides a separate secondary discharge pipe with nozzles designed specifically for the secondary flow, thus making it possible to reduce the size of the secondary pumping device which in turn lowers the manufacturing costs.
- This invention addresses these problems by offering a simple method of combining the separation and the collection of the granules, leaving the tank interior accessible for cleaning and also facilitating the cleaning of the granules themselves as well as the measuring of the amount of granules in the machine to see if more granules are needed.
- The invention will now be described in more detail with reference to the accompanying drawings, in which
- FIG 1
- is a sectional view of a first embodiment of a device according to the invention, the device including an upwards orientated outlet for cleaning fluid with granules,
- FIG 2
- is a perspective view of the device according to FIG 1,
- FIG 3
- is a sectional view of a second embodiment of a device according to the invention, the device including a downwards orientated outlet for cleaning fluid with granules,
- FIG 4
- is a perspective view of the device according to FIG 3,
- FIG 5
- is a sectional view of a third embodiment showing an alternative way of pumping the outgoing secondary granule-free flow from the tank with the same type of primary flow as in FIG 3, and
- FIG 6
- is a perspective view of the device according to FIG 5.
- The cleaning machine according to FIG 1 and FIG 2 comprises a
treatment chamber 1 in whichgoods 2 are placed in awashing rack 3.First nozzles 4 in afirst discharge pipe 5 are provided through which the cleaning agent is discharged under pressure against the goods. Below thetreatment chamber 1 there is atank 6 into which the cleaning agent is allowed to flow in a return flow from thetreatment chamber 1. From thetank 6, the primary flow of cleaning agent mixed with granules is taken by aprimary pumping device 7 which discharges the cleaning agent into afirst conduit 20 leading to thefirst discharge pipe 5. From the tank also the secondary flow of cleaning agent without granules is taken by asecondary pumping device 18 and discharged through asecond conduit 8 to asecond discharge pipe 9 with a set ofsecond nozzles 10. - This secondary flow can be much smaller than the primary flow since it is not intended to clean the goods with granule mixed liquid but to flush the remaining granules off the goods, and the
discharge pipe 9 with itssecond nozzles 10 is designed accordingly. However, less heavily soiled goods can be cleaned by the secondary flow with liquid only through thesecond nozzles 10. By starting either of the two pumping devices, it is possible to control the outgoing flow to be mixed, or not mixed with granules. - In the bottom of the
tank 6 there is placed agranule collector 11 in such a way that aspace 16 is created below the collector. Thegranule collector 11 is perforated with holes small enough to catch granules and let liquid through. Thecollector 11 can be lifted out of the machine together with the collected granules thus leaving the interior of thetank 6 free from granules and easily accessible for cleaning purposes. - In the embodiment shown in FIG 1 the fluid in the tank is pumped off in the following way. A
lower conduit 12 extends through ahole 17 in the bottom of thecollector 11 and leads to theprimary pumping device 7. To prevent granules from entering this conduit when theprimary pumping device 7 is not in operation and from falling out of thecollector 11 when thecollector 11 is lifted out of the machine, there is adeflector 13 positioned above the hole in the collector bottom. Preferably, thedeflector 13 is connected to the collector at some distance above the bottom of thecollector 11. In a preferred embodiment thedeflector 13 is integral with thecollector 11. - When the cleaning operation is finished, the
primary pumping device 7 stops and thesecondary pumping device 18 starts pumping liquid from thespace 16 below the collector through a liquid receivingconduit 21. Since the collector is perforated and will not let granules through, the resulting outgoing flow will consist of liquid only. - In the embodiment shown in FIG 3 and FIG 4 a modification is made in the bottom of the
collector 11. Above the bottom of thecollector 11 there is asuction conduit 14 leading to theprimary pumping device 7. The direction of the primary flow from the collector is upwards against the force of gravity which prevents granules from entering theprimary pumping device 7 when it is not in operation. The working of the secondary flow is the same as described above with reference to FIG 1. - In a further embodiment according to FIG 5 the secondary flow of cleaning agent without granules is taken by the secondary pumping device through a
large sieve 15 above thecollector 11. Thesieve 15 can be positioned in such a way that it does not impede the removal of the collector. The working of the primary flow is the same as described above with reference to FIG 3. - In order to make it possible to remove the
collector 11 containing the collected granules in the embodiments according to FIG 3 to FIG 5, thesuction conduit 14 should be removable or hinged to swing out of the way. A coupling or joint 19 is then provided between a fixed section of thesuction conduit 14 and a movable section. - It is also possible to combine the embodiment shown in FIG 1 with the embodiment shown in FIG 5. In such an embodiment liquid is sucked from a position above the
granule collector 11, preferably through asieve 15, while the granule mixture is sucked through thehole 17 in the bottom of thegranule collector 11.
Claims (13)
- Method for separating granules from a return flow of a cleaning fluid which is a mixture of a liquid and granules having a higher density than the liquid, the method including the steps of directing a return flow through a soiled objects treatment chamber (1) and a tank (6) disposed below the treatment chamber (1) of said washing machine and pumping the mixture by means of a primary pumping device (7) through a first discharge pipe (5) and through a first set of nozzles (4) against soiled objects (2) arranged in the treatment chamber (1), characterisedby obtaining the mixture for pumping via the primary pumping device (7) from within a granule collector (11) and obtaining only liquid for pumping against the soiled objects from a position in the tank (6) outside the granule collector (11),by pumping only liquid against the soiled objects (2) by a secondary pumping device (18),by collecting the granules in the granule collector (11) disposed a lower part of the tank (6), said collector being self-contained and detachable from the tank (6), andby directing the liquid pumped by the secondary pumping device (18) through a second discharge pipe (9) and a second set of nozzles (10) designed to supply fluid at a lower flow rate than does the first set of nozzles (4).
- Method according to claim 1, wherein the mixture is sucked through a hole (17) in the bottom of the granule collector (11).
- Method according to claim 2, wherein granules are prevented from falling vertically directly into said hole (17).
- Method according to claim 1, wherein the mixture is sucked against the force of gravity from a position within the granule collector (11).
- Method according to claim 1, wherein liquid is sucked from a space (16) below the granule collector (11).
- Method according to claim 1, wherein liquid is sucked from a position above the granule collector (11).
- A washing machine comprising a device for separating granules from a return flow of a cleaning fluid, wherein said fluid is a mixture of a liquid and granules having a higher density than the liquid, the return flow passing through a soiled objects treatment chamber (1) and a tank (6) disposed below the treatment chamber (1), the tank (6) being equipped with at least one granule collector (11) and a primary pumping device (7) pumping the cleaning fluid mixture through a first discharge pipe (5) and through a first set of nozzles (4) against the soiled objects (2) arranged in the treatment chamber (1), wherein a primary pumping device mixture supplying conduit (12; 14) having a mouth extending into the granule collector (11) and thus into the tank (6) and a liquid receiving conduit (21) is provided to obtain liquid from a position in the tank (6) exterior to the granule collector (11), characterised inthat a secondary pumping device (18) is connected to the liquid receiving conduit (21) for receiving liquid and pumping only liquid against the soiled objects (2),in that said granule collector (11) being a self-contained detachable collector is provided in a lower part of the tank (6) and,in that a second discharge pipe (9) and a second set of nozzles (10) are connected to the secondary pumping device (18) for discharging only liquid to the soiled objects (2), said second set of nozzles (10) being adapted for supplying fluid at a lower flow rate than said first set of nozzles (4).
- A washing machine according to claim 7, wherein a hole (17) is formed in the bottom of the granule collector (11) and wherein the mixture receiving conduit (12) opens through said hole (17).
- A washing machine according to claim 8, wherein the granule collector (11) is provided with a deflector (13) for preventing granules from falling vertically directly into said hole (17).
- A washing machine according to claim 7, wherein the mixture receiving conduit (14) is formed as a suction conduit opening down into the granule collector (11) to suck the mixture against the force of gravity.
- A washing machine according to claim 7, wherein the liquid receiving conduit (21) is arranged with an opening in a space (16) below the granule collector (11).
- A washing machine according to claim 7, wherein the liquid receiving conduit (21) is arranged with an opening in a position above the granule collector (11).
- A washing machine according to claim 12, wherein the liquid receiving conduit (21) is provided with a sieve (15) for preventing granules from entering into the liquid receiving conduit (21).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9801836 | 1998-05-26 | ||
SE9801836A SE521116C2 (en) | 1998-05-26 | 1998-05-26 | Method and apparatus for separating granules from cleaning liquid in a cleaning machine |
PCT/SE1999/000591 WO1999060914A1 (en) | 1998-05-26 | 1999-04-13 | Method and device in a cleaning machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1105034A1 EP1105034A1 (en) | 2001-06-13 |
EP1105034B1 true EP1105034B1 (en) | 2003-07-02 |
Family
ID=20411441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99925507A Expired - Lifetime EP1105034B1 (en) | 1998-05-26 | 1999-04-13 | Method for the separation of granules from a cleaning fluid mixture for cleaning objects placed in a warewasher and warewashingmachine with a granules separator |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1105034B1 (en) |
JP (1) | JP2002516129A (en) |
CN (1) | CN1143655C (en) |
AU (1) | AU4176999A (en) |
DE (1) | DE69909296T2 (en) |
SE (1) | SE521116C2 (en) |
WO (1) | WO1999060914A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB201317558D0 (en) * | 2013-10-03 | 2013-11-20 | Xeros Ltd | Cleaning apparatus |
GB201320784D0 (en) * | 2013-11-25 | 2014-01-08 | Xeros Ltd | Improved cleaning Apparatus and method |
GB201416718D0 (en) * | 2014-09-22 | 2014-11-05 | Xeros Ltd | Treatment apparatus and separating device |
CN110522391B (en) * | 2019-07-23 | 2021-03-23 | 广东美的白色家电技术创新中心有限公司 | Respirator of dish washer and have its dish washer |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2967633D1 (en) * | 1979-04-02 | 1986-12-11 | Carl Goran Christer Mosell | Cleaning machine |
SE454839B (en) * | 1982-11-26 | 1988-06-06 | Adence Ab | Dishwasher for accommodating large articles |
SE8301624D0 (en) * | 1983-03-24 | 1983-03-24 | Carl Goran Christer Mosell | SET AT CLEANER |
SE469507B (en) * | 1991-03-01 | 1993-07-19 | Viptop Ab | GRANULD DISK MACHINE INCLUDING A PARTY WITH A SWINGABLE LOWER PARTY FOR SEPARATION OF GRANULES FROM CLEANING WET |
SE9201117D0 (en) * | 1992-04-08 | 1992-04-08 | Svemo Mekaniska Ab | DEVICE FOR DISHWASHERS |
SE500315C2 (en) * | 1992-04-24 | 1994-05-30 | Pw System Ab | Cleaning machine for handling goods with liquid and granules |
-
1998
- 1998-05-26 SE SE9801836A patent/SE521116C2/en unknown
-
1999
- 1999-04-13 DE DE69909296T patent/DE69909296T2/en not_active Expired - Fee Related
- 1999-04-13 CN CNB998066680A patent/CN1143655C/en not_active Expired - Fee Related
- 1999-04-13 WO PCT/SE1999/000591 patent/WO1999060914A1/en active IP Right Grant
- 1999-04-13 EP EP99925507A patent/EP1105034B1/en not_active Expired - Lifetime
- 1999-04-13 JP JP2000550384A patent/JP2002516129A/en active Pending
- 1999-04-13 AU AU41769/99A patent/AU4176999A/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
AU4176999A (en) | 1999-12-13 |
SE9801836D0 (en) | 1998-05-26 |
EP1105034A1 (en) | 2001-06-13 |
CN1303246A (en) | 2001-07-11 |
JP2002516129A (en) | 2002-06-04 |
DE69909296T2 (en) | 2004-05-13 |
WO1999060914A1 (en) | 1999-12-02 |
SE521116C2 (en) | 2003-09-30 |
DE69909296D1 (en) | 2003-08-07 |
SE9801836L (en) | 1999-11-27 |
CN1143655C (en) | 2004-03-31 |
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