EP0150478A1 - Dishwashing machine with self-cleaning pump protection filter - Google Patents
Dishwashing machine with self-cleaning pump protection filter Download PDFInfo
- Publication number
- EP0150478A1 EP0150478A1 EP84116142A EP84116142A EP0150478A1 EP 0150478 A1 EP0150478 A1 EP 0150478A1 EP 84116142 A EP84116142 A EP 84116142A EP 84116142 A EP84116142 A EP 84116142A EP 0150478 A1 EP0150478 A1 EP 0150478A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mesh filter
- coarse
- jet
- water
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/4202—Water filter means or strainers
- A47L15/4208—Arrangements to prevent clogging of the filters, e.g. self-cleaning
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/4202—Water filter means or strainers
- A47L15/4206—Tubular filters
Definitions
- the present invention relates to a dishwashing machine provided with a discharge pump protection filter adapted to be automatically cleaned durign operation of the machine.
- Known dishwashing machines usually have a water collection well at the bottom of a washing tub, with the inlet of a water circulation pump and the inlet of a water discharge pump connected to said well.
- the water collection well houses a fine-mesh recirculation filter disposed in the flowpath of the water aspirated by the circulation pump.
- the fine-mesh filter is formed with an opening directly connecting the interior of the tub with the inlet of the discharge pump. Disposed in this opening is a coarse mesh filter, referred to as a discharge pump protection filter and having as its main purpose the retention of coarse impurities, such as bits of china or glass, bones and the like which might otherwise obstruct or even damage the impeller of the discharge pump.
- the corase-mesh pump protection filter will of course also retain shreds and bits of softer materials, such as paper shreds, breadcrumbs, fatty matter and the like, which may in the long run obstruct the filter, as part of the water aspirated by the circulation pump also passes therethrough.
- the usually dismountable coarse-mesh filter has therefore to be cleaned at relatively short intervals.
- jet nozzles are designed to produce jets of water substantially perpendicular to the axis of the coarse-mesh filter in proximity to the inlet side of the filteritself (where the tangential water jet has practically no effect at all), and in an intermediate zone, where the coarse-mesh filter is surrounded by the fine-mesh filter which disperses the water jet so as to render it ineffective with regard to the coarse-mesh filter.
- dishwashing machines provided with rotating jet nozzles directed perpendicularly to the fine-mesh filter in countercurrent to the flow of the water aspirated by the circulation pump.
- This construction does not provide a solution for the problem of automatically cleaning the discharge pump protection filter.
- the rotating jet nozzles In view of their inclined positions, the rotating jet nozzles have no cleaning effect on the coarse-mesh filter, resulting in the latter being all the more readily clogged by the impurities.
- a dishwashing machine comprising a washing tub provided with a fine-mesh filter disposed in the flowpath of water aspirated by a circulation pump and formed with an opening directly connecting the interior of said tub with the water intake of a discharge pump, and a coarse-mesh filter seted in said opening.
- a dishwashing of this type is essentially characterized by comprising spray jet means adapted to direct at least one water jet against said coarse-mesh filter in a substantially coaxial direction therewith for effecting the cleaning thereof.
- the spray jet means preferably comprise at least one additional opening formed in at least one rotatable arm provided for irrigating the dishes.
- a dishwashing machine comprises a washing tub 3 (only partially shown), the bottom of which is formed as a well 4 for'collecting the dishwashing and rinsing water.
- a circulation pump 5 supplying at least one rotatable arm 6 for irrigating the dishes and the like to be washed (not shown) in a per se known manner.
- Washing tub 3 contains a fine-mesh filter 7 disposed in the flowpath of the water collecting in well 4 after having been sprayed onto the dishes, and to be aspirated again by circulation pump 5.
- Fine-mesh filter 6 is of a known configuration, having a frustoconical portion for the insertion of a removable coarse-mesh filter 8 of corrsponding shape disposed substantially in the flowpath of water from well 4 to a discharge pump 9.
- Coars-mesh filter 8 acts in a known manner as a discharge pump protection filter.
- the dishwashing machine includes spray jet means arranged to direct at least one water jet onto filter 8 in a substantially coaxial direction thereof-for automatically cleaning the filter by disintegrating low-consistency impurities collected therein.
- the water jet may be produced by providing an additional opening 10 at the bottom side of rotatable irrigation arm 6 (fig. 1). In this case the water jet 11 is effective to clean filter 8 in an intermittent manner.
- water jet 11 may be produced by a stationary jet nozzle 12 (fig. 2) connected to the outlet of circulation pump 5, preferably on a horizontal axis and associated with a deflector 13 for directing the water jet towards the pump protection filter 8.
- a stationary jet nozzle 12 (fig. 2) connected to the outlet of circulation pump 5, preferably on a horizontal axis and associated with a deflector 13 for directing the water jet towards the pump protection filter 8.
- Deflector 13 may of course be mounted at any position considered most favourable. Also, water jet 11 may be produced in any equivalent manner.
- the discharge pump protection filter 8 will always have been efficiently cleaned at the edn of each operating cycle of the dishwashing machine.
Landscapes
- Washing And Drying Of Tableware (AREA)
- Details Of Reciprocating Pumps (AREA)
- Treatment Of Water By Ion Exchange (AREA)
- Disintegrating Or Milling (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Fats And Perfumes (AREA)
- Detergent Compositions (AREA)
Abstract
Description
- The present invention relates to a dishwashing machine provided with a discharge pump protection filter adapted to be automatically cleaned durign operation of the machine.
- Known dishwashing machines usually have a water collection well at the bottom of a washing tub, with the inlet of a water circulation pump and the inlet of a water discharge pump connected to said well.
- The water collection well houses a fine-mesh recirculation filter disposed in the flowpath of the water aspirated by the circulation pump. The fine-mesh filter is formed with an opening directly connecting the interior of the tub with the inlet of the discharge pump. Disposed in this opening is a coarse mesh filter, referred to as a discharge pump protection filter and having as its main purpose the retention of coarse impurities, such as bits of china or glass, bones and the like which might otherwise obstruct or even damage the impeller of the discharge pump.
- The corase-mesh pump protection filter will of course also retain shreds and bits of softer materials, such as paper shreds, breadcrumbs, fatty matter and the like, which may in the long run obstruct the filter, as part of the water aspirated by the circulation pump also passes therethrough.
- The usually dismountable coarse-mesh filter has therefore to be cleaned at relatively short intervals.
- Already known from Italian Patent 952,947 is a diswashing machine provided with stationary jet nozzles for automatically cleaning the fine-mesh and coarse-mesh filters.
- These jet nozzles are designed to produce jets of water substantially perpendicular to the axis of the coarse-mesh filter in proximity to the inlet side of the filteritself (where the tangential water jet has practically no effect at all), and in an intermediate zone, where the coarse-mesh filter is surrounded by the fine-mesh filter which disperses the water jet so as to render it ineffective with regard to the coarse-mesh filter.
- Also known, for instance from US Patent 3,810,480 are dishwashing machines provided with rotating jet nozzles directed perpendicularly to the fine-mesh filter in countercurrent to the flow of the water aspirated by the circulation pump.
- This construction does not provide a solution for the problem of automatically cleaning the discharge pump protection filter.
- From European Patent Application No. 0068974 there is further known a dishwashing machine provided with rotating jet nozzles directed obliquely onto the surface of the fine-mesh recirculation filter so as to concentrate and to convey to the interior of the coarse-mesh discharge pump protection filter any particulate impurities collecting on the recirculation filter.
- In view of their inclined positions, the rotating jet nozzles have no cleaning effect on the coarse-mesh filter, resulting in the latter being all the more readily clogged by the impurities.
- It is an object of the present invention to provide a dishwashing machine of simple construction and reliable operation, which is provided with a discharge pump protection filter arranged to be automatically and efficiently cleaned at the end at least of each dishwashing cycle.
- This object is attained by a dishwashing machine comprising a washing tub provided with a fine-mesh filter disposed in the flowpath of water aspirated by a circulation pump and formed with an opening directly connecting the interior of said tub with the water intake of a discharge pump, and a coarse-mesh filter seted in said opening.
- According to the invention, a dishwashing of this type is essentially characterized by comprising spray jet means adapted to direct at least one water jet against said coarse-mesh filter in a substantially coaxial direction therewith for effecting the cleaning thereof.
- The spray jet means preferably comprise at least one additional opening formed in at least one rotatable arm provided for irrigating the dishes.
- In this manner, operation of the circulation pump automatically results in the disintegration of impurities collected in the discharge pump protection filter, which is usually disposed in a relatively quiescent zone of the washing tub. The coarse-mesh filter is thus always kept sufficiently clean, its maintenance being limited to the infrequent necessity of removing coarse and relatively indestructible impurities, such as bits of china or glass, bones and the like, from the filter.
- The characteristics and advantages of the invention will become more clearly evident from the following description, given by way of example with reference to the accompanying drawings, wherein:
- fig. 1 and 2 show diagrammatic representations of dishwashing machines in two functionally equivalent embodiments of the invention.
- With reference to the drawings, a dishwashing machine comprises a washing tub 3 (only partially shown), the bottom of which is formed as a
well 4 for'collecting the dishwashing and rinsing water. Disposed in communication with well 4 is acirculation pump 5 supplying at least onerotatable arm 6 for irrigating the dishes and the like to be washed (not shown) in a per se known manner. Washingtub 3 contains a fine-mesh filter 7 disposed in the flowpath of the water collecting in well 4 after having been sprayed onto the dishes, and to be aspirated again bycirculation pump 5. Fine-mesh filter 6 is of a known configuration, having a frustoconical portion for the insertion of a removable coarse-mesh filter 8 of corrsponding shape disposed substantially in the flowpath of water from well 4 to adischarge pump 9. - Coars-
mesh filter 8 acts in a known manner as a discharge pump protection filter. - According to the invention, the dishwashing machine includes spray jet means arranged to direct at least one water jet onto
filter 8 in a substantially coaxial direction thereof-for automatically cleaning the filter by disintegrating low-consistency impurities collected therein. - In a preferred embodiment, the water jet may be produced by providing an
additional opening 10 at the bottom side of rotatable irrigation arm 6 (fig. 1). In this case thewater jet 11 is effective to cleanfilter 8 in an intermittent manner. - In an alternative embodiment,
water jet 11 may be produced by a stationary jet nozzle 12 (fig. 2) connected to the outlet ofcirculation pump 5, preferably on a horizontal axis and associated with adeflector 13 for directing the water jet towards thepump protection filter 8. -
Deflector 13 may of course be mounted at any position considered most favourable. Also,water jet 11 may be produced in any equivalent manner. - In any case, and in contrast to known arrangements, the discharge
pump protection filter 8 will always have been efficiently cleaned at the edn of each operating cycle of the dishwashing machine.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT84116142T ATE54559T1 (en) | 1984-01-05 | 1984-12-21 | DISHWASHER WITH SELF-CLEANING PUMP PROTECTION FILTER. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT3400284U | 1984-01-05 | ||
IT8434002U IT8434002V0 (en) | 1984-01-05 | 1984-01-05 | DISHWASHER MACHINES WITH SELF-CLEANING PUMP FILTER. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0150478A1 true EP0150478A1 (en) | 1985-08-07 |
EP0150478B1 EP0150478B1 (en) | 1990-07-18 |
Family
ID=11238505
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84116142A Expired - Lifetime EP0150478B1 (en) | 1984-01-05 | 1984-12-21 | Dishwashing machine with self-cleaning pump protection filter |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0150478B1 (en) |
AT (1) | ATE54559T1 (en) |
DE (1) | DE3482759D1 (en) |
ES (1) | ES283281Y (en) |
IT (1) | IT8434002V0 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1980193A1 (en) * | 2006-05-30 | 2008-10-15 | Electrolux Home Products Corporation N.V. | Method for cleaning the filter of a dishwasher and dishwasher for carrying out the same |
US20170265712A1 (en) * | 2016-03-17 | 2017-09-21 | Samsung Electronics Co., Ltd. | Self-cleaning filtration system for a dishwasher |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT209170Z2 (en) * | 1985-11-13 | 1988-09-16 | Zanussi Elettrodomestici | DISHWASHER MACHINE WITH SELF-CLEANING RECIRCULATION FILTER. |
IT211138Z2 (en) * | 1986-06-04 | 1989-02-13 | Zanussi Elettrodomestici | DISHWASHER WITH DETERGENT RECOVERY. |
SE468269B (en) * | 1989-01-11 | 1992-12-07 | Electrolux Ab | DISHWASHER WITH FINSIL AND MICROFILTERS ORGANIZED IN A COLLECTION CONTAINER |
SE500246C2 (en) * | 1990-04-26 | 1994-05-24 | Electrolux Ab | Arrangement by a dishwasher |
US6782899B2 (en) * | 2000-12-14 | 2004-08-31 | Lg Electronics Inc. | Dishwasher |
KR100438270B1 (en) * | 2001-05-07 | 2004-07-02 | 엘지전자 주식회사 | Dishwasher |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB286092A (en) * | 1927-03-04 | 1928-03-01 | Valdemar Rendle | Improvements in and relating to washing machines for crockery and the like |
GB490913A (en) * | 1937-03-02 | 1938-08-23 | Separator Ab | Improvements in dish-washing machine |
DE1269776B (en) * | 1960-01-16 | 1968-06-06 | Boelkow Ludwig | Filter device on dishwashers |
FR2445130A1 (en) * | 1978-12-29 | 1980-07-25 | Hobart Corp | DERIVATIVE DIRT COLLECTOR FOR DISHWASHER |
EP0068974A1 (en) * | 1981-06-30 | 1983-01-05 | Esswein S.A. | Dish washer with automatically cleaning filter |
EP0082592A1 (en) * | 1981-11-09 | 1983-06-29 | KITCHENAID, INC. (a Delaware corporation) | Dishwasher |
-
1984
- 1984-01-05 IT IT8434002U patent/IT8434002V0/en unknown
- 1984-12-10 ES ES1984283281U patent/ES283281Y/en not_active Expired
- 1984-12-21 DE DE8484116142T patent/DE3482759D1/en not_active Expired - Lifetime
- 1984-12-21 EP EP84116142A patent/EP0150478B1/en not_active Expired - Lifetime
- 1984-12-21 AT AT84116142T patent/ATE54559T1/en not_active IP Right Cessation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB286092A (en) * | 1927-03-04 | 1928-03-01 | Valdemar Rendle | Improvements in and relating to washing machines for crockery and the like |
GB490913A (en) * | 1937-03-02 | 1938-08-23 | Separator Ab | Improvements in dish-washing machine |
DE1269776B (en) * | 1960-01-16 | 1968-06-06 | Boelkow Ludwig | Filter device on dishwashers |
FR2445130A1 (en) * | 1978-12-29 | 1980-07-25 | Hobart Corp | DERIVATIVE DIRT COLLECTOR FOR DISHWASHER |
EP0068974A1 (en) * | 1981-06-30 | 1983-01-05 | Esswein S.A. | Dish washer with automatically cleaning filter |
EP0082592A1 (en) * | 1981-11-09 | 1983-06-29 | KITCHENAID, INC. (a Delaware corporation) | Dishwasher |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1980193A1 (en) * | 2006-05-30 | 2008-10-15 | Electrolux Home Products Corporation N.V. | Method for cleaning the filter of a dishwasher and dishwasher for carrying out the same |
US20170265712A1 (en) * | 2016-03-17 | 2017-09-21 | Samsung Electronics Co., Ltd. | Self-cleaning filtration system for a dishwasher |
US10448801B2 (en) * | 2016-03-17 | 2019-10-22 | Samsung Electronics Co., Ltd. | Self-cleaning filtration system for a dishwasher |
Also Published As
Publication number | Publication date |
---|---|
IT8434002V0 (en) | 1984-01-05 |
ES283281U (en) | 1985-05-01 |
DE3482759D1 (en) | 1990-08-23 |
ATE54559T1 (en) | 1990-08-15 |
EP0150478B1 (en) | 1990-07-18 |
ES283281Y (en) | 1985-12-16 |
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