EP0786230B1 - Device for diverting and shutting-off the spraying flow in a dishwashing machine, a washing machine in general and associated machine which uses this device - Google Patents

Device for diverting and shutting-off the spraying flow in a dishwashing machine, a washing machine in general and associated machine which uses this device Download PDF

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Publication number
EP0786230B1
EP0786230B1 EP96202595A EP96202595A EP0786230B1 EP 0786230 B1 EP0786230 B1 EP 0786230B1 EP 96202595 A EP96202595 A EP 96202595A EP 96202595 A EP96202595 A EP 96202595A EP 0786230 B1 EP0786230 B1 EP 0786230B1
Authority
EP
European Patent Office
Prior art keywords
diverting
flow
shutting
electromagnets
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
Application number
EP96202595A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0786230A3 (en
EP0786230A2 (en
Inventor
Silvano Fumagalli
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.)
Candy SpA
Original Assignee
Candy SpA
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 Candy SpA filed Critical Candy SpA
Publication of EP0786230A2 publication Critical patent/EP0786230A2/en
Publication of EP0786230A3 publication Critical patent/EP0786230A3/en
Application granted granted Critical
Publication of EP0786230B1 publication Critical patent/EP0786230B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A47L15/4219—Water recirculation
    • A47L15/4221—Arrangements for redirection of washing water, e.g. water diverters to selectively supply the spray arms
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements

Definitions

  • the present invention relates to a device for diverting and shutting off the spraying flow, and more generally the flow, in a dishwashing machine, a washing machine in general, and to an associated machine which uses this device.
  • the spraying devices may consist of a number of fixed manifolds, of oscillating arms or of rotary whirlers or combinations of these.
  • the efficiency of the washing operation is determined essentially by the speed of the spraying jets leaving the nozzles and by their distribution in the washing chamber: ideally, the jets should be capable of scanning all the points of the various surfaces to be washed, a requirement which, to be satisfied, would require the use of a high number of nozzles and of a considerable liquid flow with a high feed pressure.
  • EP-A-0547011 describes a device for diverting the flow of liquid for a dishwasher, comprising a body forming an internal chamber having a liquid inlet and two liquid outlets, the device further comprising a hidraulically activated clapet for alternatively closing one or the other of said two liquid outlets.
  • Electromagnetic shut-off and diversion valves consume considerable power, require constant maintenance and involve a high risk of loss of liquid or of ageing and breaking of the elastic diaphragm separating the electrical parts from the hydraulic circuit, if of the diaphragm type.
  • Thermoelectric actuators in which the mechanical actuation is brought about by the expansion of appropriate substances which are appropriately heated electrically, are more economical and require a lower feed power, but have considerable thermal inertia which is irreconcilable with the requirement for rapid control of flow diversion.
  • Flow-diverting devices of automatic type have also been proposed, which use the flow of liquid induced by the pump to actuate a hydraulic wheel which, directly or via a suitable reduction in the number of revolutions, moves a diaphragm for diverting the flow.
  • the present invention overcomes these disadvantages and provides a device for diverting and shuting-off the spraying flow in dishwashing machines, which is simple and reliable, of very low consumption and of low cost, of maximum safety and of particularly rapid action, and which imperviously separates the external control members from the moving shut-off members inside the hydraulic circuit.
  • a diverting device in which a plurality of shut-off diaphragms or plugs, each for a different flow path, are held in an open position by the action of magnetic attraction exerted between a magnetic element integral with the diaphragm and the core of an electromagnet outside the hydraulic circuit and separated from the magnet by a hydraulic separating wall constituting a gap for the magnetic circuit.
  • the temporary excitation of the electromagnet which may be of the moving core type or the repulsion type, or the flux-cancellation type, by reducing the mutual attraction force or replacing it with a repulsive force, between magnetic element and core, allows the associated diaphragm to move from a position in which it opens, to a position in which it closes a flow path through the effect of a hydrodynamic thrust exerted on the diaphragm by a flow of liquid initiated by a circulation pump.
  • Figure 1 shows in diagrammatic form a dishwashing machine incorporating the device for changing over and shutting off the flow according to the invention, which is also shown in diagrammatic form.
  • the dishwashing machine comprises a washing chamber 1 provided at the bottom with a tank 2 for collecting liquid, into which, on the command of a programming device 3, washing water taken from the mains 4 is admitted.
  • the machine also includes a recirculation pump 5 which sucks up liquid from the collecting tank 2 in order to convey it into pipes for feeding spraying devices, which are typically but not necessarily two rotors, a lower 6 and an upper 7 rotor respectively, provided with spraying nozzles which spray with water the dishes accommodated in appropriate baskets (not shown) in the washing chamber.
  • spraying devices typically but not necessarily two rotors, a lower 6 and an upper 7 rotor respectively, provided with spraying nozzles which spray with water the dishes accommodated in appropriate baskets (not shown) in the washing chamber.
  • the rotors 6 and 7 are of the hydraulic whirler type, and are set in rotation by the thrust exerted by the spraying jets, without the need for motive members devoted to this purpose.
  • the pump 5 feeds a distribution chamber 8, above which two pipes 9, 10 open for delivering liquid to the rotors 6, 7 respectively.
  • two plugs 11, 12 are accommodated in the chamber 8, and are provided with a cylindrical tang 13, 14 which can slide axially vertically inside a sleeve 15, 16 formed inside the chamber 8.
  • a core of permanent magnetic material 17, 18 respectively is fixed, preferably in a recess of the tang.
  • the chamber 8, the plugs 11, 12 and the tangs 13, 14 and the sleeves 15, 16 are made of non-magnetic material, preferably of plastic.
  • the pressure of the fluid jet in the narrowed section must be lower than the pressure of the fluid jet in the wider section.
  • the plugs 11 and 12 maintain the closed position for the entire time that the pump is active and return, by the effect of gravity and by virtue of any thrust exerted by the fluid present in the pipes 9, 10, to the rest position when the pump is deactivated.
  • a ferromagnetic core 19 of a suction-type electromagnet 20 is juxtaposed to the magnet 17.
  • the core 19 is pressed by a spring 21 against the wall of the chamber 8 and separated from the magnet 17 by a gap of a thickness equal to the thickness of the wall of the chamber.
  • the excitation of the electromagnet 20 causes the core 19 to be drawn inside the electromagnet and to move away from the magnet 17 with the formation of a much larger gap between the two elements.
  • the excitation of the electromagnet can be effected using a.c. voltage, for example mains voltage, or using d.c. voltage, without distinction, and is to be maintained for a very short time, of the order of a second.
  • a.c. voltage for example mains voltage
  • d.c. voltage without distinction
  • the electric power required is minimal: this is because the work needed to move the plug 11 is performed by the hydraulic flow and the electromagnet 20 has solely the function of controlling temporary release.
  • the plug 12 can be actuated by an electromagnetic device identical to that described.
  • the plug 12 is controlled by a repulsion-type electromagnet 22 with a fixed core 23.
  • the magnetic core 18 is in this case constituted by a magnetic dipole with predetermined orientation, for example with the SOUTH pole facing the wall of the chamber 8.
  • This embodiment can advantageously be used in dishwashing machines in which the programmer 3 is of electronic type with a microprocessor instead of electro-mechanical type.
  • a d.c. voltage source (5/15V) must be provided for feeding the programmer.
  • the same voltage can be used for feeding the electromagnet without any additional cost.
  • the function of releasing the plugs can be obtained using a flux-cancellation electromagnet.
  • Figure 1 shows a third pipe 24, the end of which opens into the chamber 8 to convey a flow of liquid towards a third spraying device 25 (alternatively, this could also be a waste pipe).
  • a plug 26 identical to the previous plugs is juxtaposed at the bottom to the end of the pipe 24 and provided with a tang 27 in which a core 28 made of unmagnetized ferromagnetic material is accommodated.
  • the tang 27 is accommodated in a guide sleeve 29.
  • a magnetic dipole 29 Arranged outside the chamber 8 and juxtaposed to the core 28 is a magnetic dipole 29, with one pole, for example the SOUTH pole, orientated towards the core 28 so as to exert a force of attraction on the core 28.
  • the release electromagnets have, for the sake of simplicity, been shown as being constituted by cylindrical cores accommodated in a winding coil.
  • Figures 2 and 3 respectively show a preferred embodiment in a composite vertical section and in a top view along section II-II in Figure 2 of a change-over device.
  • the device consists of a body 31 made of moulded plastic material provided at the top with a cylindrical union 32 divided into two semi-cylindrical sectors by a diametral baffle 33.
  • the union ends at the bottom in a transverse diaphragm 34, in which two apertures 35, 36 open, which are symmetrical relative to the axis of the union, in the shape of circular sectors with a size of 90° and respectively facing the two semi-cylindrical sectors of the union.
  • the body 31 Underneath the diaphragm 34, the body 31 extends to form a housing chamber 41 for two blade-type shut-off levers or clappers 37, 39 which close the apertures 35 (and 37 if present) and 36 respectively.
  • the chamber 41 is extended at the bottom in a union 40 which is suitably angled (for example with the axis of the union 40 forming an angle of 45° with the vertical axis of the union 32), for connection to a liquid delivery pipe 42.
  • the levers 38, 39 are hinged on a pin 49 parallel to the plane of the diaphragm 34 and outside its extension in such a manner that, by rotation of the levers about the pin 49, these can adopt a position for closing and for opening the ports 35, 36 respectively.
  • lever 38 is shown in closed position and the lever 39 in open position which, in the absence of hydrodynamic thrusts, is advantageously adopted under the effect of gravity.
  • the chamber 41 is provided on one side with a flanged aperture closed by a flanged plug 46 for support of the levers 38, 39 and the release control devices.
  • suction-type electromagnets 43, 44 consist of two identical suction-type electromagnets 43, 44, one of which can be seen in section in Figure 2 and comprises a cylindrical ferromagnetic core 45, which is axially movable in a housing formed by the plug 46 and a winding 47.
  • a compression spring 48 presses the core 45 against the head of its housing, towards the chamber 41, moving it away from the winding 47.
  • the levers 38, 39 are provided with a housing for a magnet 50, 51.
  • the magnet is juxtaposed to the movable core of the associated release device and separated from the latter by the thickness of the flanged plug 46.
  • Figure 4 shows in top view the sub-assembly formed by the blade-type levers 38, 39 (shown in horizontal closed position), by the flanged plug 46 and by the pair of suction-type electromagnets 43, 44.
  • the levers are pivoted on the pin 49 engaged in a trio of supports 52, 53, 54 which are integral with the flanged plug, in such a manner that the sub-assembly, assembled thus, can be easily fixed, by means of screws or clamping collar, to the body 31.
  • An O-ring seal interposed between the flanged plug 46 and the coupling flange of the body 31 ensures perfect sealing of the joint.
  • the two blade-type levers are held in open position and a flow admitted into the body of the device through the union 40 can flow freely into the two semi-cylindrical sections of the outlet union 32.
  • the outlet union 32 is divided into two semi-cylindrical sections which have to be connected in an accurate manner to the two ducts 56, 57, the connection between the two elements is advantageously achieved using a bayonet coupling of the union 32 on the end 59 of the pipe, bush 58, which for this purpose is provided with coupling pins 60, 61.
  • a choking port 37 is provided, which is not shut off by the lever 39, a choked flow will continue to flow out into the pipe 57, limited by the section and by the head losses in the choking port 37.
  • the body of the diverter will in this case be provided with two flanged apertures arranged symmetrically in relation to the axis of the unions and closed by two identical release devices similar to that in Figure 4, in which, however, the two blade-type levers have identical dimensions.
EP96202595A 1996-01-26 1996-09-17 Device for diverting and shutting-off the spraying flow in a dishwashing machine, a washing machine in general and associated machine which uses this device Expired - Lifetime EP0786230B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI960140 1996-01-26
IT96MI000140A IT1282071B1 (it) 1996-01-26 1996-01-26 Dispositivo di deviazione e intercettazione di flusso di irrorazione per macchina lavastoglie lavatrice in genere e relativa macchina

Publications (3)

Publication Number Publication Date
EP0786230A2 EP0786230A2 (en) 1997-07-30
EP0786230A3 EP0786230A3 (en) 1998-08-05
EP0786230B1 true EP0786230B1 (en) 2003-01-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96202595A Expired - Lifetime EP0786230B1 (en) 1996-01-26 1996-09-17 Device for diverting and shutting-off the spraying flow in a dishwashing machine, a washing machine in general and associated machine which uses this device

Country Status (3)

Country Link
EP (1) EP0786230B1 (it)
DE (1) DE69625787T2 (it)
IT (1) IT1282071B1 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11974711B2 (en) 2018-10-16 2024-05-07 Foshan Shunde Midea Washing Appliances Manufacturing Co., Ltd. Dish washer

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1264570B1 (en) * 2000-02-14 2010-01-20 Panasonic Corporation Washing machine
ITMI20010238A1 (it) * 2001-02-07 2002-08-07 T & P Spa Valvola deviatrice per macchina di lavaggio e relativi metodi di applicazione
US7475696B2 (en) 2003-06-17 2009-01-13 Whirlpool Corporation Dishwasher having valved third-level sprayer
US7523758B2 (en) 2003-06-17 2009-04-28 Whirlpool Corporation Dishwasher having rotating zone wash sprayer
US7445013B2 (en) 2003-06-17 2008-11-04 Whirlpool Corporation Multiple wash zone dishwasher
JP4483670B2 (ja) * 2005-04-14 2010-06-16 パナソニック株式会社 食器洗い機
DE202009017897U1 (de) * 2009-02-16 2010-07-22 BSH Bosch und Siemens Hausgeräte GmbH Haushaltsgeschirrspülmaschine
US8347898B2 (en) 2009-04-30 2013-01-08 Whirlpool Corporation Dishwasher with rotating zone wash sprayers
US9259138B2 (en) 2010-12-07 2016-02-16 Whirlpool Corporation Dishwasher with auxiliary spray system having removable sprayers
US9119517B2 (en) 2011-10-17 2015-09-01 Whirlpool Corporation Dishwasher having spray manifold and method for controlling same
ITRN20110071A1 (it) * 2011-10-20 2013-04-21 Indesit Co Spa Elettrodomestico di lavaggio e/o asciugatura.
US9713414B2 (en) 2013-06-21 2017-07-25 Whirlpool Corporation Dishwasher having a conduit framework
US10076224B2 (en) 2014-01-20 2018-09-18 Whirlpool Corporation Dishwasher
CN105212866B (zh) * 2015-09-30 2018-06-19 宁波安佳卫厨电器有限公司 一种洗碗机的分水器的控制方法
IT201900010245A1 (it) * 2019-06-27 2020-12-27 Silanos S R L Sistema di risciacquo per macchine lavastoviglie, e macchina lavastoviglie comprendente tale sistema di risciacquo.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1252886B (it) * 1991-12-11 1995-07-04 Procedimento di lavaggio per una macchina lavastoviglie di tipo industriale e macchina lavastoviglie relativa
DE4241497C2 (de) * 1992-12-09 1997-02-13 Bosch Siemens Hausgeraete Haushalt-Geschirrspülmaschine
IT1276464B1 (it) * 1995-07-04 1997-10-31 Elbi Int Spa Elettrovalvola intercettatrice di flusso

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11974711B2 (en) 2018-10-16 2024-05-07 Foshan Shunde Midea Washing Appliances Manufacturing Co., Ltd. Dish washer

Also Published As

Publication number Publication date
EP0786230A3 (en) 1998-08-05
EP0786230A2 (en) 1997-07-30
IT1282071B1 (it) 1998-03-09
DE69625787T2 (de) 2003-10-02
DE69625787D1 (de) 2003-02-20
ITMI960140A0 (it) 1996-01-26
ITMI960140A1 (it) 1997-07-26

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