EP2087830A1 - Filter assembly for industrial dishwasher - Google Patents
Filter assembly for industrial dishwasher Download PDFInfo
- Publication number
- EP2087830A1 EP2087830A1 EP08425074A EP08425074A EP2087830A1 EP 2087830 A1 EP2087830 A1 EP 2087830A1 EP 08425074 A EP08425074 A EP 08425074A EP 08425074 A EP08425074 A EP 08425074A EP 2087830 A1 EP2087830 A1 EP 2087830A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filtering element
- filter assembly
- assembly according
- filter
- circular ring
- 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
- A47L15/4206—Tubular filters
Definitions
- the present invention relates to industrial dishwashers, and in particular to an improved filter assembly to be used in said machines.
- the obj ect of the present invention is to provide an improved filter assembly which overcomes said drawback.
- the main advantage of the filter assembly according to the present invention is that of achieving a high filtering without clogging problems, since it is capable of retaining all those residues that could actually cause damage to the machine while letting through all those residues that could cause the clogging, so as to validly contribute to a good wash effectiveness of the dishwasher.
- Another advantage of the present filter assembly is that of being made up of few simple parts, which positively affects its cost and the ease in assembling and disassembling it.
- the filter assembly includes a first filtering element 1 introduced from above into a second filtering element 2, which is in turn located into the central opening of a concave-shaped flat filter 3 that acts as a lid of the collecting sump CS formed in the tank bottom TB of a dishwasher.
- the flat filter 3 consists of a perforated stainless steel sheet, with holes having a diameter indicatively between 1,5 and 2,2 mm, which has the function of letting through most (about 75-85%) of the flow rate of the wash pump, and of receiving in its central opening the second filtering element 2 that is made up of three concentric cylinders 2a, 2b and 2c of different diameter joined through a concave circular ring 2d provided with openings.
- the inner cylinder 2a extends above ring 2d and is closed but for openings on the top side; the outer cylinder 2b also extends above ring 2d and has a top peripheral rim 4 for fitting into the flat filter 3, as well as a side wall with slots in the range of 0,8-1,2 mm in width; and finally the intermediate cylinder 2c extends below ring 2d and is open at the bottom but closed on the side except for at least one, but preferably two or more, slots 5 of width W and height H, where W is in the range 0,5-2 mm and H is in the range 15-35 mm.
- the first filtering element 1 consists of two concentric cylinders 1a, 1b joined at their bases through connecting ribs that leave a circular passage 6 whose width C ranges from 4 to 6 mm, preferably 5 mm.
- the inner cylinder 1a is closed but for openings on the top side and is sized to fit on the inner cylinder 2a of the second filtering element 2;
- the outer cylinder 1b has a top peripheral rim 7 for fitting into the outer cylinder 2b of the second filtering element 2, as well as a side wall with holes having a diameter indicatively between 1 and 1,5 mm.
- the circular passage 6 is also preferably limited by vertical radial ribs 8 formed with a pitch P in the range from 10 to 16 mm, more preferably between 12 and 14 mm.
- slots 5 have a particular function since during the operation of the wash pump, as indicated by arrow WP, thanks to the proximity of slots 5 to the suction duct of the wash pump there is generated a water stream that coming down from the top portion of the filter assembly tends to bring along therewith the dirt residues that get through, collecting them in the collection area CA. A contribution to said downward stream is also given, with varying amounts depending on the manufacturing tolerances, by the radial and axial play between the bottom edge of the intermediate cylinder 2c and the circular seat S of sump CS in which it fits.
Abstract
Description
- The present invention relates to industrial dishwashers, and in particular to an improved filter assembly to be used in said machines.
- It is known that industrial dishwashers used in professional fields (restaurants, bars, etc.) are capable of washing dishes within extremely reduced times, thanks to some constructional features that make them different from domestic dishwashers in various respects. In particular, thanks to the presence of two distinct wash and rinse circuits each having its own sprinklers, the wash water is sprayed onto the dishes by a wash pump and during the rinse a portion of this water is replaced by rinse water pre-heated in a heater and fed to the rinse circuit by a suitable rinse pump.
- However, most often the same manufacturers of those machines advise the users to rinse the dishes prior to washing them, with a clear waste of water and time, because if the dishes are introduced into the machine as they are removed from the table (apart from disposing of the largest residues) the wash results are often poor. In fact, these machines are provided with filter devices substantially intended only to prevent damages to the wash and drain circuits of the machine, because in case some residues such as nutshells, toothpicks, mollusc shells or the like end up in the pumps they can block them and/or clog the water ejection nozzles.
- Prior art filters, therefore, rather than cooperating in keeping as clean as possible the wash water, which is not changed between a cycle and the following one but for the partial restoring with clean water during the rinse phase, retain almost completely the dirt that by building up cycle after cycle pollutes the wash water ever more.
- It is clear that in order to achieve a good wash effectiveness it is necessary that the filter assembly succeeds in retaining the potentially harmful dirt particles without clogging. For this reason, it is essential to manufacture a filter assembly having a correct balance between the requirements of filtering and not being clogged, i.e. capable of letting through for evacuation by the drain pump all those residues that by building up increase the water dirtiness in addition to progressively clogging the filters, typically rice grains, bits of meat or vegetables, bread crumbs and the like.
- Prior art filter devices have the drawback of not striking this balance of requirements, whereby they do not allow to achieve a desirable high wash effectiveness.
- Therefore the obj ect of the present invention is to provide an improved filter assembly which overcomes said drawback.
- This object is achieved by means of a filter assembly having the features cited in
claim 1. Other advantageous features are disclosed in the dependent claims. - The main advantage of the filter assembly according to the present invention is that of achieving a high filtering without clogging problems, since it is capable of retaining all those residues that could actually cause damage to the machine while letting through all those residues that could cause the clogging, so as to validly contribute to a good wash effectiveness of the dishwasher.
- Another advantage of the present filter assembly is that of being made up of few simple parts, which positively affects its cost and the ease in assembling and disassembling it.
- These and other advantages and characteristics of the filter assembly according to the present invention will be clear to those skilled in the art from the following detailed description of an embodiment thereof, with reference to the annexed drawings wherein:
-
Fig.1 is a perspective exploded view showing the tank bottom of a dishwasher provided with the present filter assembly; -
Fig.2 is a vertical sectional view of said filter assembly; -
Fig.3 is a vertical sectional view of said tank bottom region with the filter assembly in the assembled state; and -
Fig.4 is a perspective enlarged view of a first filtering element of the filter assembly. - With reference to
figures 1 to 3 , there is seen that the filter assembly according to the present invention includes afirst filtering element 1 introduced from above into asecond filtering element 2, which is in turn located into the central opening of a concave-shapedflat filter 3 that acts as a lid of the collecting sump CS formed in the tank bottom TB of a dishwasher. - The
flat filter 3 consists of a perforated stainless steel sheet, with holes having a diameter indicatively between 1,5 and 2,2 mm, which has the function of letting through most (about 75-85%) of the flow rate of the wash pump, and of receiving in its central opening thesecond filtering element 2 that is made up of threeconcentric cylinders circular ring 2d provided with openings. - More specifically, the
inner cylinder 2a extends abovering 2d and is closed but for openings on the top side; theouter cylinder 2b also extends abovering 2d and has a topperipheral rim 4 for fitting into theflat filter 3, as well as a side wall with slots in the range of 0,8-1,2 mm in width; and finally theintermediate cylinder 2c extends belowring 2d and is open at the bottom but closed on the side except for at least one, but preferably two or more,slots 5 of width W and height H, where W is in the range 0,5-2 mm and H is in the range 15-35 mm. - The
first filtering element 1 consists of twoconcentric cylinders - More specifically, the
inner cylinder 1a is closed but for openings on the top side and is sized to fit on theinner cylinder 2a of thesecond filtering element 2; theouter cylinder 1b has a topperipheral rim 7 for fitting into theouter cylinder 2b of thesecond filtering element 2, as well as a side wall with holes having a diameter indicatively between 1 and 1,5 mm. - As shown in
Fig.4 , where said perforated side wall is omitted for the sake of clarity of the drawing, the circular passage 6 is also preferably limited by verticalradial ribs 8 formed with a pitch P in the range from 10 to 16 mm, more preferably between 12 and 14 mm. - Thanks to these features, all the residues that pass through the filter assembly can smoothly be evacuated by the drain pump, as indicated by arrow DP, that removes them from the collection area CA located under the filter assembly, whereas the other residues that could cause troubles are retained (
Fig.3 ). - It should be noted that
slots 5 have a particular function since during the operation of the wash pump, as indicated by arrow WP, thanks to the proximity ofslots 5 to the suction duct of the wash pump there is generated a water stream that coming down from the top portion of the filter assembly tends to bring along therewith the dirt residues that get through, collecting them in the collection area CA. A contribution to said downward stream is also given, with varying amounts depending on the manufacturing tolerances, by the radial and axial play between the bottom edge of theintermediate cylinder 2c and the circular seat S of sump CS in which it fits.
Claims (7)
- Filter assembly for industrial dishwasher including a first filtering element (1) introduced into a second filtering element (2) which is in turn received in an opening of a concave-shaped flat filter (3) suitable to act as a lid for the collecting sump (CS) formed in the tank bottom (TB) of a dishwasher, characterized in that said first filtering element (1) consists of two concentric cylinders (1a, 1b) joined at their bases through connecting ribs that leave a circular passage (6) whose width (C) ranges from 4 to 6 mm, preferably 5 mm.
- Filter assembly according to claim 1, characterized in that the circular passage (6) is also limited by vertical radial ribs (8) formed with a pitch (P) in the range from 10 to 16 mm, preferably between 12 and 14 mm.
- Filter assembly according to claim 1 or 2, characterized in that the first filtering element (1) includes an inner cylinder (1a) closed but for openings on the top side and an outer cylinder (1b) having a side wall with holes having a diameter indicatively between 1 and 1,5 mm.
- Filter assembly according to one of the preceding claims, characterized in that the second filtering element (2) is made up of three concentric cylinders (2a, 2b, 2c) joined through a concave circular ring (2d), all the parts (2a, 2b, 2c, 2d) of said second filtering element (2) being provided with openings.
- Filter assembly according to claim 4, characterized in that the second filtering element (2) includes an inner cylinder (2a) that extends above the circular ring (2d) and is closed but for openings on the top side, an outer cylinder (2b) that extends above the circular ring (2d) and has a top peripheral rim (4) for fitting into the flat filter (3) and a side wall with slots in the range of 0,8-1,2 mm in width, and an intermediate cylinder (2c) that extends below the circular ring (2d) and is open at the bottom but closed on the side except for at least one, preferably two or more, slots (5) of width W and height H, where W is in the range 0,5-2 mm and H is in the range 15-35 mm.
- Filter assembly according to claim 4 or 5, characterized in that the inner cylinder (1a) of the first filtering element (1) is sized to fit on the inner cylinder (2a) of the second filtering element (2) and the outer cylinder (1b) of the first filtering element (1) has a top peripheral rim (7) for fitting into the outer cylinder (2b) of the second filtering element (2).
- Filter assembly according to one of the preceding claims, characterized in that the flat filter (3) consists of a perforated stainless steel sheet with holes having a diameter between 1,5 and 2,2 mm.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT08425074T ATE454081T1 (en) | 2008-02-08 | 2008-02-08 | FILTER ARRANGEMENT FOR INDUSTRIAL DISHWASHERS |
DE602008000512T DE602008000512D1 (en) | 2008-02-08 | 2008-02-08 | Filter arrangement for industrial dishwashers |
EP08425074A EP2087830B1 (en) | 2008-02-08 | 2008-02-08 | Filter assembly for industrial dishwasher |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08425074A EP2087830B1 (en) | 2008-02-08 | 2008-02-08 | Filter assembly for industrial dishwasher |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2087830A1 true EP2087830A1 (en) | 2009-08-12 |
EP2087830B1 EP2087830B1 (en) | 2010-01-06 |
Family
ID=39580034
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08425074A Active EP2087830B1 (en) | 2008-02-08 | 2008-02-08 | Filter assembly for industrial dishwasher |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2087830B1 (en) |
AT (1) | ATE454081T1 (en) |
DE (1) | DE602008000512D1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101822919A (en) * | 2009-10-27 | 2010-09-08 | 南京乐金熊猫电器有限公司 | Filtering device of dishwasher and dishwashers has the filtering device |
EP2263512A1 (en) * | 2009-06-17 | 2010-12-22 | Bonferraro S.p.A. | Hood-type industrial dishwasher with improved filter assembly |
EP2759245A1 (en) * | 2013-01-23 | 2014-07-30 | Miele & Cie. KG | Dishwasher with a collecting pot |
CN107440659A (en) * | 2016-05-30 | 2017-12-08 | 青岛海尔洗碗机有限公司 | A kind of dish-washing machine double filtering system and double filtration method |
CN107928592A (en) * | 2017-12-13 | 2018-04-20 | 佛山市顺德区美的洗涤电器制造有限公司 | Cistern assembly and washing electric appliance |
CN109222813A (en) * | 2018-10-31 | 2019-01-18 | 芜湖广盈实业有限公司 | A kind of water basin dish-washing machine water circuit system |
CN109793473A (en) * | 2019-03-06 | 2019-05-24 | 佛山市顺德区美的洗涤电器制造有限公司 | Filtration system and household electrical appliance |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8834647B2 (en) | 2011-08-05 | 2014-09-16 | General Electric Company | Manual removable filter system for a dishwasher |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2096456A (en) * | 1981-04-10 | 1982-10-20 | Bosch Siemens Hausgeraete | Dishwashing machine sump filter |
EP0752231A1 (en) * | 1995-07-06 | 1997-01-08 | Merloni Elettrodomestici S.p.A. | Dishwashing machine with improved filtering system, and filtering method thereof |
EP0855165A2 (en) * | 1997-01-22 | 1998-07-29 | SMEG S.p.A. | Improved filtering device for dishwashers |
DE3745169C2 (en) * | 1986-11-13 | 1999-07-22 | Candy Elettrodomestici | Operating dishwasher in work cycle |
EP0943285A1 (en) * | 1998-03-17 | 1999-09-22 | Whirlpool Corporation | Dishwasher |
US20040163690A1 (en) * | 2002-11-28 | 2004-08-26 | Kim Yong Hee | Filter assembly of dishwasher |
-
2008
- 2008-02-08 AT AT08425074T patent/ATE454081T1/en not_active IP Right Cessation
- 2008-02-08 EP EP08425074A patent/EP2087830B1/en active Active
- 2008-02-08 DE DE602008000512T patent/DE602008000512D1/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2096456A (en) * | 1981-04-10 | 1982-10-20 | Bosch Siemens Hausgeraete | Dishwashing machine sump filter |
DE3745169C2 (en) * | 1986-11-13 | 1999-07-22 | Candy Elettrodomestici | Operating dishwasher in work cycle |
EP0752231A1 (en) * | 1995-07-06 | 1997-01-08 | Merloni Elettrodomestici S.p.A. | Dishwashing machine with improved filtering system, and filtering method thereof |
EP0855165A2 (en) * | 1997-01-22 | 1998-07-29 | SMEG S.p.A. | Improved filtering device for dishwashers |
EP0943285A1 (en) * | 1998-03-17 | 1999-09-22 | Whirlpool Corporation | Dishwasher |
US20040163690A1 (en) * | 2002-11-28 | 2004-08-26 | Kim Yong Hee | Filter assembly of dishwasher |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2263512A1 (en) * | 2009-06-17 | 2010-12-22 | Bonferraro S.p.A. | Hood-type industrial dishwasher with improved filter assembly |
EP2263512B1 (en) | 2009-06-17 | 2015-06-17 | Bonferraro S.p.A. | Hood-type industrial dishwasher with improved filter assembly |
CN101822919A (en) * | 2009-10-27 | 2010-09-08 | 南京乐金熊猫电器有限公司 | Filtering device of dishwasher and dishwashers has the filtering device |
EP2759245A1 (en) * | 2013-01-23 | 2014-07-30 | Miele & Cie. KG | Dishwasher with a collecting pot |
CN107440659A (en) * | 2016-05-30 | 2017-12-08 | 青岛海尔洗碗机有限公司 | A kind of dish-washing machine double filtering system and double filtration method |
CN107440659B (en) * | 2016-05-30 | 2020-08-28 | 青岛海尔洗碗机有限公司 | Dual-filtering system and dual-filtering method of dish washing machine |
CN107928592A (en) * | 2017-12-13 | 2018-04-20 | 佛山市顺德区美的洗涤电器制造有限公司 | Cistern assembly and washing electric appliance |
CN107928592B (en) * | 2017-12-13 | 2021-04-20 | 佛山市顺德区美的洗涤电器制造有限公司 | Water tank assembly and washing appliance |
CN109222813A (en) * | 2018-10-31 | 2019-01-18 | 芜湖广盈实业有限公司 | A kind of water basin dish-washing machine water circuit system |
CN109222813B (en) * | 2018-10-31 | 2024-04-16 | 芜湖广盈实业有限公司 | Water channel system of sink dish washer |
CN109793473A (en) * | 2019-03-06 | 2019-05-24 | 佛山市顺德区美的洗涤电器制造有限公司 | Filtration system and household electrical appliance |
Also Published As
Publication number | Publication date |
---|---|
DE602008000512D1 (en) | 2010-02-25 |
EP2087830B1 (en) | 2010-01-06 |
ATE454081T1 (en) | 2010-01-15 |
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