WO1998022015A1 - Lave-vaisselle - Google Patents

Lave-vaisselle Download PDF

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Publication number
WO1998022015A1
WO1998022015A1 PCT/SE1997/001959 SE9701959W WO9822015A1 WO 1998022015 A1 WO1998022015 A1 WO 1998022015A1 SE 9701959 W SE9701959 W SE 9701959W WO 9822015 A1 WO9822015 A1 WO 9822015A1
Authority
WO
WIPO (PCT)
Prior art keywords
dishwasher
valve
tub
operating arm
dishwasher according
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.)
Ceased
Application number
PCT/SE1997/001959
Other languages
English (en)
Inventor
Bertil Rogmark
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Viptop AB
Original Assignee
Viptop AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Viptop AB filed Critical Viptop AB
Priority to EP97913656A priority Critical patent/EP0939600A1/fr
Publication of WO1998022015A1 publication Critical patent/WO1998022015A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • A47L15/0094—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

  • the invention relates to a dishwasher using abrasive granules and comprising a tub having an arrangement for spraying washing liquid against dishwares in the tub, means for supplying rinse water and an overflow spillway arranged for regulating the water level in the tub
  • a dishwasher of conventional type has a pump which draws dishwater from the tank of the dishwasher and sprays it out through a washing pipe.
  • the dishwater circulates in this manner until the washing is completed, and the pump then stops.
  • clean hot water is supplied from outside and is sprayed in through a rinse pipe.
  • the amount of water which is sprayed in during the rinse cycle will raise a level so that water begins to run out through an overflow spillway connected to the dishwasher drain.
  • the overflow spillway is provided with a filter to prevent abrasive material from exiting through the drain.
  • the filter will, of course, not only prevent the abrasive material from entering the drain but also dirt which floats on the surface of the dishwater, and this is not a desirable function.
  • Dishwashers with overflow spillways are previously known, e.g. by WO 88/08270, which shows a dishwasher with an overflow spillway.
  • WO 88/08270 shows a dishwasher with an overflow spillway.
  • this type of machine only a small volume of rinse water is used, between 2 and 5 liters, which, since it is collected in the tank 1, causes the level in the tank 1 to be raised temporarily, somewhat over the overflow level. This enables the surface layer of the liquid in the tank 1 to be diverted through the overflow spillway together with grease, food and other contaminants floating on the liquid.
  • foam formation for various reasons during the work cycle of the dishwasher, involving formation of a significant foam layer above the lower liquid layer.
  • the overflow spillway of the dishwasher is therefore equipped with a float valve, which is intended to prevent foam and dishwater from disappearing through the overflow spillway even if the dishwater level normally lies below the overflow level.
  • the float valve does not, however, facilitate diversion of the dirt particles to the overflow spillway.
  • the purpose of the present invention is therefore to achieve an overflow spillway for an abrasive granule dishwasher of the stated type, which has an arrangement which prevents both dishwater and abrasive granules from disappearing through the spillway during the operating cycles of the dishwasher and which reduces the contami- nation of the dishwater.
  • This is achieved with an overflow spillway which is in the form of a standpipe disposed in the tub and having a valve connected thereto, which is operable between an open and a closed position in such a manner that the standpipe is closed during the work cycle of the dish-washer, and cannot be opened until the work cycle has been completed.
  • Fig. 1 a dishwasher using abrasive granules with a conventional overflow spillway
  • Fig. 2 a strainer for the conventional overflow spillway
  • Figs. 3-5 an overflow spillway valve, according to the invention, during different stages of the operating cycle of the dishwasher, Figs. 6-8 different variants for the positively controlled operation of the overflow spillway valve by means of the movement of the dishwasher lid, its door, or the movement of the dishware rack.
  • Fig. 1 shows a conventional abrasive granule dishwasher 2, having a tub 4 for dishes and a collection tank 6 for dishwater.
  • the tub has a washing spray arm 8 which is connected to the pressure side of a pump 10, the suction side of which is connected to a bottom drain 12 in the tank.
  • a rinse spray arm 14 is also arranged in the tub 4 and is connected to an external source 16 of clean hot water.
  • the overflow spillway is provided with a strainer 22 to prevent the granules from going out through the drain.
  • the pump 10 draws dishwater from the tank 6 and sprays it through the washing spray arm 8 against the wares to be washed (not shown).
  • the dishwater is collected in the tank 6 and is circulated in this manner until the end of the washing cycle, when the pump stops.
  • the rinse cycle then begins, where clean hot water is supplied from the hot water line 16, showering the dishwares through the rinse spray arm 14.
  • the control system of the dishwasher checks that the dishwater level is correct in the tub 4 and further water is added, if necessary, via the external source 16.
  • the amount of water sprayed in during the rinse cycle will raise the level 24 so that water begins to run out through the overflow spillway 18. Since the overflow spillway is provided with the strainer 22, the water must first pass through the strainer.
  • the strainer will, however, not only prevent granules from passing but also grease and other contaminants, floating on the surface of the dishwater, from going out through the drain, and this is unde- sirable. Furthermore, the excess water will flow towards the drain, as soon as the level has been raised so much that the surface tension of the water at the outlet is broken. This situation causes dirt and grease particles to remain on the water surface around the strainer and the overflow spillway instead of running out with the water.
  • the strainer 22 has been eliminated and the overflow spillway 18 has instead been provided with a device, preferably in the form of a ball 26 disposed at the opening 28 of the overflow spillway standpipe 18, thereby forming a valve 30.
  • the ball seats against the opening 28 under influence of a weight 3
  • the valve seals the overflow spillway when the pump 10 is activated.
  • the water level 24 during the rinse cycle rises to a higher level 32.
  • approximately 3-15 liters of clean hot water are supplied while the valve 30 is still closed, which means that the water level 24 will be raised to a new level 32, which for the stated amount of added hot water, lies 10-15 mm above the lower level 24.
  • the valve 30 is opened by lifting the ball 26 upwards (see Fig. 5). Due to the greater level differential, a significantly better flow is obtained, which effectively draws with it dirt and food particles floating on the surface of the dishwater. Since the strainer 22 has been eliminated, the contamination of the water in the dishwasher tank is reduced so that the dishwater does not need to be changed as often as in other overflow spillway designs.
  • the movement of the valve can of course be achieved in various manners, for example by electromechanical (linear) means or by water hydraulics, but a simple and cost-saving method is to use the existing mechanical movements in the operating cycles of the dishwasher.
  • a dishwasher of the type in question there are three such suitable mechanical movements.
  • Such movements can be closing or opening of the tub, for example, if the dishwasher has a lid 34 or doors 36.
  • Certain machines have a rotating rack (not shown in the drawing) which is driven by a drive mechanism comprising a drive shaft 38 which is displaced upwards, as seen on the drawing, to engage the rack or downwards to release it.
  • the lid 34 is lifted, the doors 36 are opened or the rack drive mechanism 38 moves down for emptying the machine so that it can be used again.
  • Fig. 6 shows the operation of the valve 30 in a dishwasher 2, the lid 34 resting in its closed position on the dishwasher 2.
  • An operating arm 42 is fixed 44 with one end to the inside of the lid 34.
  • the ball 26 has a hole slidingly fitted to the cross-section of the operating arm, and by means of which the ball can be displaced along the arm 42.
  • the other end of the arm is made as an end abutment 46, and a compression spring 48 acts between a spring shoulder 49 on the operating arm and the ball 26, which is thus pressed towards the end abutment 46 when the lid is open and against the opening 28 of the overflow spillway standpipe when the lid 34 is closed.
  • the ball 26 is thus directly actuated by the movement of the lid via the arm 42 and the spring 48 in both directions, as shown by the double arrow.
  • the lid 34 of the dishwasher When the lid 34 of the dishwasher is lifted, its movement in the direction of the single arrow can thus be used to open the valve 30 by virtue of the fact that the arm 42 lifts the ball from its seat in the opening 28 of the overflow spillway standpipe.
  • the valve ball 26 will in this case assume the position shown in Fig.
  • Fig. 7 shows an additional embodiment of a dishwasher 2 which has openable doors 36.
  • a double-ended lever 50 has a 90 degree bend and is pivoted 52 in the dish- washer 2.
  • One arm rests against the door 36 when the door is closed and is provided with a weight 54, while the other arm is connected to the ball 26.
  • the ball 26, when the door 36 is closed, is pressed against the opening 28 of the overflow spillway.
  • the valve 30 is moved to its open position by virtue of the fact that the weight 54 is released and tips forward against the dishwasher 2, and this in turn lifts the other end of the lever and the ball 26 from the opening 28, thereby opening the valve.
  • Fig. 8 shows an additional embodiment for controlling the valve 30 utilizing the movement of the drive shaft 38 for the drive mechanism of a rotating rack (not shown).
  • a straight, two-armed lever 56 is pivoted 58 centrally in the dishwasher 2.
  • One end of the lever is actuated by the drive shaft 38 which, when it is in its engaged position shown in Fig. 8, is located immediately above the lever, the other end of which is connected to the ball 26 which seats, due to its weight, against the opening 28.
  • the drive shaft 38 after the dishwasher has completed its work cycles, moves in the direction of the arrow, the ball 26 is lifted by the lever 56 from its seat in the opening 28, and the valve is thus opened.
  • valve means is in the form of a ball 26, but the valve means can, of course, be in the form of a flat valve disc or a conventional valve disc, or can have another form suitable to its valve function.
  • the opening 28 of the overflow spillway standpipe should also be made with a shape complementary to the valve means.

Landscapes

  • Washing And Drying Of Tableware (AREA)

Abstract

L'invention concerne un lave-vaisselle (2) utilisant des granules abrasifs et présentant une évacuation de trop-plein (18) dotée d'une soupape (30) à bille (26) qui est commandée de manière positive par un bras de commande (42), par exemple, en fonction du mouvement de la porte (34) du lave-vaisselle (34).
PCT/SE1997/001959 1996-11-22 1997-11-21 Lave-vaisselle Ceased WO1998022015A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97913656A EP0939600A1 (fr) 1996-11-22 1997-11-21 Lave-vaisselle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9604298A SE508948C2 (sv) 1996-11-22 1996-11-22 Blästrande diskmaskin med bräddavlopp
SE9604298-1 1996-11-22

Publications (1)

Publication Number Publication Date
WO1998022015A1 true WO1998022015A1 (fr) 1998-05-28

Family

ID=20404717

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/001959 Ceased WO1998022015A1 (fr) 1996-11-22 1997-11-21 Lave-vaisselle

Country Status (3)

Country Link
EP (1) EP0939600A1 (fr)
SE (1) SE508948C2 (fr)
WO (1) WO1998022015A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4086929A (en) * 1976-11-08 1978-05-02 Hobart Corporation Door and drain control interlock
GB2043433A (en) * 1979-02-24 1980-10-08 Licentia Gmbh Regulating liquid levels in dish washing machines
US4257454A (en) * 1978-12-04 1981-03-24 G. S. Blakeslee & Company Drain plugs
WO1988008270A1 (fr) * 1987-04-23 1988-11-03 Wexiödisk AB Dispositif permettant d'empecher les pertes de liquide de lavage provenant d'un lave-vaisselle de type commercial
EP0333251A2 (fr) * 1988-03-18 1989-09-20 Unilever N.V. Dispositif de trop-plein
SE469923B (sv) * 1992-03-03 1993-10-11 Granuldisk Ab Granuldiskmaskin med ventil för separering av granuler ur vätskan

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4086929A (en) * 1976-11-08 1978-05-02 Hobart Corporation Door and drain control interlock
US4257454A (en) * 1978-12-04 1981-03-24 G. S. Blakeslee & Company Drain plugs
GB2043433A (en) * 1979-02-24 1980-10-08 Licentia Gmbh Regulating liquid levels in dish washing machines
WO1988008270A1 (fr) * 1987-04-23 1988-11-03 Wexiödisk AB Dispositif permettant d'empecher les pertes de liquide de lavage provenant d'un lave-vaisselle de type commercial
EP0333251A2 (fr) * 1988-03-18 1989-09-20 Unilever N.V. Dispositif de trop-plein
SE469923B (sv) * 1992-03-03 1993-10-11 Granuldisk Ab Granuldiskmaskin med ventil för separering av granuler ur vätskan

Also Published As

Publication number Publication date
SE508948C2 (sv) 1998-11-16
SE9604298D0 (sv) 1996-11-22
SE9604298L (sv) 1998-05-23
EP0939600A1 (fr) 1999-09-08

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