EP0795292B1 - Geschirrspüler mit drehbarem Sprüharm mit selektiv gespeisten Sprühdüsen und Verfahren - Google Patents

Geschirrspüler mit drehbarem Sprüharm mit selektiv gespeisten Sprühdüsen und Verfahren Download PDF

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Publication number
EP0795292B1
EP0795292B1 EP96202882A EP96202882A EP0795292B1 EP 0795292 B1 EP0795292 B1 EP 0795292B1 EP 96202882 A EP96202882 A EP 96202882A EP 96202882 A EP96202882 A EP 96202882A EP 0795292 B1 EP0795292 B1 EP 0795292B1
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EP
European Patent Office
Prior art keywords
manifolds
sprayer
spraying
rotation
nozzles
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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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EP96202882A
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English (en)
French (fr)
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EP0795292A3 (de
EP0795292A2 (de
Inventor
Silvano Fumagalli
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Candy SpA
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Candy SpA
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    • 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
    • A47L15/4278—Nozzles
    • A47L15/4282—Arrangements to change or modify spray pattern or direction

Definitions

  • the present invention relates to a dishwashing machine with at least one rotating spraying device, and preferably two, provided with selectively fed spraying nozzles, and an associated washing method.
  • dishwashing machines consist essentially of a washing chamber, closed at the bottom by a tank for collecting liquid, into which washing water, if appropriate decalcified, is admitted and, in appropriate phases of the washing process, expediently heated and mixed with detergent.
  • the washing liquid is sucked in, during the washing process, by a pump and conveyed into spraying devices, generally of the type with rotating arms arranged symmetrically relative to an axis of rotation, which, by their movement, spray, possibly with a uniform distribution of the spraying jets in the chamber, the dishes accommodated in appropriate baskets in the washing chamber.
  • spraying devices generally of the type with rotating arms arranged symmetrically relative to an axis of rotation, which, by their movement, spray, possibly with a uniform distribution of the spraying jets in the chamber, the dishes accommodated in appropriate baskets in the washing chamber.
  • the power employed by the pump is, to a first approximation, for equal head H which determines the outflow speed of the jets, proportional to the cumulative flow rate of the jets and the smaller the latter is the lower the power employed is.
  • dishwashing machines have also been proposed, in which the pump is actuated by variable-speed motors, for example by three-phase asynchronous motors supplied by a converter, the frequency of which can be controlled.
  • the washing process or cycle generally comprises different phases of prewashing, washing and rinsing, in which the washing liquid which is sprayed onto the dishes ought to have different characteristics.
  • variable-speed pumps does not achieve an optimum result because a reduction in speed does involve a reduction in head but also in the flow rate, whereas an increase in the latter is desirable.
  • a further disadvantage of known dishwashing machines is that the rotary spraying arms, of the hydraulic whirler type, are set in rotation by the thrust of at least one spraying jet ad always rotate in the same direction: the arrangement of the dishes in the baskets therefore leads, in relation to the shape of the dishes, to the formation of areas of shade, that is to say surface areas of the dishes which cannot be reached directly by the spraying jets.
  • a further limitation of known dishwashing machines is that the rotating spraying arms are provided with a fair number of spraying nozzles which, during the rotation of the arms, travel along predetermined spraying circumferences or "paths" generating discontinuous spraying cones so that the direct action of the jets on the surface of the dishes, even in the absence of areas of shade, is not complete.
  • DE-A-3 816 408 and DE-A-3 813 510 disclose dishwashing machines with spray elements subdivided in two channels and a changeover device for connecting the channels to a circulating pump.
  • the spraying nozzles which are open in one of the manifolds are arranged at a radial distance from the axis of rotation of the device intermediate in relation to that of the spraying nozzles open in the other manifold so as to double the number of spraying paths.
  • the thrust nozzles open in the two manifolds are orientated so as to impart co-operating torques to the spraying device.
  • the thrust nozzles open in the two manifolds are orientated in order to impart to the sprayer opposite torques so as to set the spraying device in rotation in one or the other of the two directions of rotation according to whether one or the other of the two manifolds is fed.
  • the thrust nozzles are dimensioned and/or arranged at a distance from the axis of rotation of the device and/or fed with fluid at different pressure in such a manner that the opposite torques which are generated in the case of combined feeding of the two pipes do not neutralize one another and the resulting torque sets the spraying device in rotation.
  • the dishwashing machine is provided with programming devices to order the combined feeding of the two manifolds during the prewashing and rinsing phases of a washing cycle, and the intermittent mutually exclusive feeding alternatively of one or the other manifold during the washing phase of a washing cycle.
  • a dishwashing machine comprises essentially a washing chamber 1 which ends at the bottom in a tank 2 for collecting liquid and in a basin 3 for containing a filter (not shown) and for conveying liquid to at least one recirculation or discharge pump 4.
  • the pump 4 is actuated by a motor 5, generally a synchronous motor, and has its outlet connected to the inlet of a diverting unit 6, for example of the rotating cylinder type, actuated by a motor member 7.
  • a filling solenoid valve 8 When open, a filling solenoid valve 8, with an inlet connected to the water mains, feeds liquid to the tank 2, if appropriate through a softening cell (not shown).
  • a level detector 9 for example of the pressure-switch type, sends a level signal to a programmer 10 which orders the activation of the solenoid valve 8, of the motor 5 and of the motor member 7 according to the various phases of a washing cycle.
  • the diverter 6 diverts the flow generated by the pump 4 selectively in a mutually exclusive manner towards a first rotating spraying device 11, or lower rotor, a second rotating spraying device 12, or upper rotor, which are arranged in the washing chamber 1, or towards a discharge 13.
  • the diverter 6 is modified in order to operate in a completely different manner which will be considered below, after the fundamental feature of the present invention has been explained.
  • At least one of the spraying devices and preferably the lower rotor 11 consists of two spraying manifolds which are separate and distinct and can be fed individually.
  • FIG. 1 The structure of the rotor 11 is illustrated in Figures 1, 2 and 3, in which it shown, respectively, in a composite vertical section (Fig. 1) along section B-B in Figure 3, in a top view (Fig. 2) and in horizontal section along the section marked A-A in Fig. 1 (Fig. 3).
  • the rotor consists of two rotating arms 14, 15 which are arranged symmetrically relative to an axis of rotation 16 and form two flow chambers or manifolds 17, 18 which are expediently separated by internal partitions 19, 20.
  • a plurality of N spraying mouths or nozzles 21, 22, 23, 24, 25, 26 are open which make the manifold 17 communicate with the outside.
  • the nozzles travel along N concentric paths which are preferably but not necessarily equidistant.
  • the spacing between the paths is essentially equal to (D-d)/(N-1) where D is the diameter of the outermost path, d the diameter of the innermost path and N the number of nozzles.
  • the manifold 17 is provided with thrust nozzles 27, 28 for the ejection of two jets of liquid with a speed component which imparts a torque to the arms, for example in the closckwise direction with reference to Figures 2 and 3, represented by the arrows 29, 30.
  • a second plurality of spraying mouths or nozzles 31, 32, 33, 34, 35, 36 (in a number M preferably but not necessarily equal to N) which make the manifold 18 communicate with the outside and are arranged in such a manner that, through the effect of the rotation of the arms, these nozzles travel along paths which are intermediate in relation to those travelled along by the nozzles of the first plurality.
  • the manifold 18 also is preferably provided at the ends of the arms with thrust nozzles 37, 38 for the ejection of two jets of liquid with a speed component which imparts a torque to the arms, for example in the same direction as that imparted by the jets emerging from the nozzles 27, 28.
  • the two manifolds 17 and 18 can be provided with thrust nozzles 39, 40 and 41, 42 respectively for the ejection of jets of liquid which impart to the arms opposite torques which are shown respectively by the arrows 43, 44, preferably of different magnitudes, which can be achieved easily by different diameters of the thrust nozzles, by different pressures of the liquid which is made to flow out from the nozzles, by different distances of the nozzles from the axis of rotation, by different orientations of the nozzles in order to achieve different useful thrust components, or by a combination of these factors.
  • the rotor 11 formed by the arms 14, 15 is provided with a hub 45, in which is inserted a screw for fixing the rotor, with the function of an axis, to a support 46, in which two coaxial ducts 47, 48 are formed, which are open on the upper face of the support and communicate respectively with the manifold 18 through two openings 49, 50 of circular-segment shape, and with the manifold 17 through an opening 51 of circular-ring shape, which surrounds the hub 45, which openings are open in the lower wall of the rotor and face the coaxial ducts 47, 48.
  • the ducts 47, 48 of the support 46 are selectively made to communicate with the outlet of the pump 4 by means of the diverting device 6.
  • the diverting device 6 can be designed to operate according to 4 angular positions of its rotating cylinder as follows:
  • the diverting device 6 is a possible means for feeding one of the manifolds 17, 18 independently of the other manifold, and can of course be replaced by other equivalent means, for example independent valve devices for closing/opening each flow path.
  • the present invention provides for using, as means for feeding at least one of the manifolds 17, 18 with a flow of spraying liquid independently with respect to the other manifold, a first pump (e.g. pump 4) and a second pump, which can be activated individually for feeding each flow paths.
  • the power consumed by the pump is shown by the curve P and initially increases for low flow rates, before decreasing rapidly as the flow rate increses.
  • the delivery is represented by the curve ⁇ .
  • the working point of the pump is defined by the intersection of the characteristic curve H(Q) with a load curve.
  • the curve QL1 represents by way of indication the load curve for a section S1 equal to the cumulative outflow opening of the nozzles which are open towards the outside in the manifold 17, and corresponds qualitatively to an optimum state of use of the pump, corresponding to the maximum delivery and to the maximum power consumed.
  • the curve QL1 represents the load curve for this group of nozzles also.
  • the joint feeding of the two manifolds 17, 18 can be combined with a slight increase in the speed of rotation of the pump.
  • the characteristic curve of the pump is represented by the curve Q1(H), the power consumed by the curve P1 and the delivery by the curve ⁇ 1.
  • the working conditions are in this case represented by the point 150 and involve a power consumption which is approximately equal to that which occurs, at lower speed, when only one of the manifolds 17, 18 is fed.
  • the programmer 10 orders the feeding of both the manifolds 17 and 18 (Fig. 3).
  • the spraying jets are distributed on spraying paths which are very close together and the operations are particularly effective without the motor for actuating the pump being overloaded (even in a case where the flow rate is increased further to the value Q3 as the speed of rotation rises).
  • a washing phase is ordered, in which only one of the manifolds of the rotor is fed.
  • the washing phase is then carried out with a reduced flow rate Q1 (Fig. 5) but with the power of the jets correlated to a high head H1 which is therefore suitable for disincrusting tenacious dirt with an effective mechanical action.
  • the washing phase can be divided into two or more sub-phases, during which one or other of the manifolds 17, 18 is fed alternatively in a mutually exclusive manner.
  • Two cases can be distinguished: in a case in which the thrust nozzles of the two manifolds exert a torque in the same direction on the rotating sprayer, it rotates in the various sub-phases, always in the same direction, and possibly at different speeds.
  • the transverse component is different in the various sub-phases and, in addition to increased resolution in washing, it is possible to exert mechanical stresses which act in different directions and to make it possible for the jets to force themselves in between adjacent walls of articles to be washed, striking directly, in one of the sub-phases, surface points which in another sub-phase are sprayed indirectly by reflection of the jets because they are concealed from direct exposure by the presence of other dishes.
  • This effect which is diagrammatically represented in Fig. 6, is intensified in a case in which the thrust nozzles exert opposed torques on the sprayer: in Fig. 6, two plates 51, 52 to be washed, arranged vertically in a washing basket (not shown), are sprayed by jets G1 during a first washing sub-phase and by jets G2 during a second sub-phase.
  • the jets G1 act effectively on the internal face of the plates and the jets G2 act effectively in a direct manner on the external face.
  • the reflected jet G1R makes it possible to spray a zone of the plate which cannot be sprayed directly by the jets G1 and G2 and the reflected jet G2R makes it possible to spray a zone of the plate 52 which cannot be sprayed directly by the jets G1, G2 or by reflection of the jet G1.
  • the washing liquid in the basin 3 is discharged in response to a command from the programmer 10 (Fig. 1) and replaced with rinsing water.
  • the rinsing phase can then be carried out with a high spraying flow rate which is obtained by feeding simultaneously the two manifolds as in the prewashing case.
  • the operation is therefore effected effectively in a very short time with a clear saving in consumption.
  • FIG. 1 an upper spraying device 12 is shown, which can have a structure which is identical to that of the sprayer 11.
  • the support 46 For feeding it with two flows of liquid, which are admitted selectively into the manifolds, the support 46 is provided with two connections 53, 54 which connect the ducts for supplying liquid 47, 48 respectively, by means of pipes 55, 56 and an upper support (not shown) for the rotating sprayer, to the sprayer 12.
  • the upper sprayer 12 is connected in parallel, in the various phases of the washing cycle, with the lower sprayer 11.
  • the upper sprayer 12 can be provided with an independent feed circuit fed by its own pump, as well as with a feed circuit which has a pump for common delivery for the two sprayers but is provided with valve devices for shutting off and diverting the flow for its feed independently of that of the lower sprayer, in such a manner that, for example, the operations of prewashing and rinsing are carried out by feeding jointly both the manifolds of the two sprayers, and the operation of washing by feeding selectively, one at a time or in a suitable combination, according to the degree of soiling, the various manifolds of the two sprayers.
  • the sprayers instead of being formed by a pair of rotating arms in which the two manifolds are formed, can also be constituted by more than two rotating arms in any number N.
  • the two manifolds can be made in one half and in the other half of the number of arms respectively.
  • the number of manifolds can also be greater than two to achieve even greater operating versatility.

Claims (8)

  1. Geschirrspüler mit wenigstens einem ersten drehbaren Sprühelement (11), das durch den hydrodynamischen Schub des Strahls in Drehung versetzt wird, der wenigstens eine Düse (29, 30) verlässt, wobei das Sprühelement (11) wenigstens zwei separate und unterschiedliche Verteiler (17, 18) aufweist, die jeweils mit einer Mehrzahl von Sprühdüsen (21, ..., 26, 31, ..., 36) versehen sind, wobei der Geschirrspüler Mittel (4, 6) zum Zuführen eines Stroms einer Sprühflüssigkeit zu wenigstens einem der Verteiler (17, 18) unabhängig von dem anderen Verteiler beinhaltet, dadurch gekennzeichnet, dass die Zufuhrmittel (4, 6) eine erste Pumpe (4) und eine zweite Pumpe beinhalten, wobei die Pumpen unabhängig betätigt werden können, um den ersten Verteiler beziehungsweise den zweiten Verteiler zu speisen.
  2. Geschirrspüler nach Anspruch 1, der Mittel (4, 6) zum Zuführen eines Stroms einer Sprühflüssigkeit zu jedem der Rohranschlüsse (17, 18) in einer wechselseitig ausschließlichen Weise beinhaltet.
  3. Geschirrspüler nach Anspruch 1 oder 2, der Mittel (4, 6, 5, 7, 10) zum gemeinsamen Speisen der Verteiler (17, 18) während einer Reinigungs- und/oder Vorreinigungsphase eines Reinigungszyklus beinhaltet.
  4. Geschirrspüler nach Anspruch 1, 2 oder 3, bei dem Düsen (22, 23, 24, 25) eines (17) der Verteiler in dem Verteiler (17) bei Abständen von der Drehachse des drehbaren Sprühelements offen sind, die zwischen den Abständen von der Drehachse liegen, bei denen die Düsen (31, 32, 33, 34, 35, 36) des anderen (18) der Verteiler offen sind.
  5. Geschirrspüler nach Anspruch 1, 2, 3 oder 4, bei dem der Strom der Sprühflüssigkeit, der den einen oder den anderen der Verteiler (17, 18) speist, das Sprühelement in der gleichen Richtung in Drehung versetzt.
  6. Geschirrspüler nach Anspruch 1, 2, 3 oder 4, bei dem der Strom der Sprühflüssigkeit, der einen der Verteiler (17, 18) speist, das Sprühelement in einer ersten Richtung mit einer ersten Drehgeschwindigkeit in Drehung versetzt und der Strom der Sprühflüssigkeit, der den anderen der Verteiler speist, das Sprühelement in der zu der ersten Richtung entgegengesetzten Richtung mit einer zweiten Drehgeschwindigkeit, die sich von der ersten Geschwindigkeit unterscheidet, in einer solchen Weise in Drehung versetzt, dass der Strom der Sprühflüssigkeit, der die Verteiler gemeinsam speist, das Sprühelement mit einer dritten Geschwindigkeit in Drehung versetzt.
  7. Geschirrspüler nach den vorhergehenden Ansprüchen, der ein zweites drehbares Sprühelement (12) beinhaltet, das wenigstens zwei separate und unterschiedliche Verteiler aufweist, die jeweils mit einer Mehrzahl von Sprühdüsen und Mitteln (4, 6) versehen sind, um einem Verteiler des ersten Sprühelements (11) und einem Verteiler des zweiten Sprühelements (12) gemeinsam einen Strom einer Sprühflüssigkeit zuzuführen.
  8. Geschirrspüler nach einem der Ansprüche 1 bis 6, der ein zweites drehbares Sprühelement (12) beinhaltet, das wenigstens zwei separate und unterschiedliche Verteiler aufweist, die jeweils mit einer Mehrzahl von Sprühdüsen und Mitteln versehen sind, um den Verteilern des zweiten Sprühelements (12) unabhängig von der Speisung der Verteiler (17, 18) des ersten Sprühelements (11) selektiv einen Strom einer Sprühflüssigkeit zuzuführen.
EP96202882A 1996-02-09 1996-10-16 Geschirrspüler mit drehbarem Sprüharm mit selektiv gespeisten Sprühdüsen und Verfahren Expired - Lifetime EP0795292B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT96MI000250A IT1282596B1 (it) 1996-02-09 1996-02-09 Lavastoviglie con spruzzatore rotante a ugelli irroratori selettivamente alimentati e relativo metodo di lavaggio
ITMI960250 1996-02-09

Publications (3)

Publication Number Publication Date
EP0795292A2 EP0795292A2 (de) 1997-09-17
EP0795292A3 EP0795292A3 (de) 1997-09-24
EP0795292B1 true EP0795292B1 (de) 2002-01-16

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EP96202882A Expired - Lifetime EP0795292B1 (de) 1996-02-09 1996-10-16 Geschirrspüler mit drehbarem Sprüharm mit selektiv gespeisten Sprühdüsen und Verfahren

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EP (1) EP0795292B1 (de)
DE (1) DE69618563T2 (de)
IT (1) IT1282596B1 (de)

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US20120279536A1 (en) * 2011-05-04 2012-11-08 Whirlpool Corporation Dishwasher spray arm with diverting valve
US9414736B2 (en) 2011-09-22 2016-08-16 Whirlpool Corporation Dishwasher with directional spray
EP2572624B8 (de) * 2011-09-22 2018-02-07 Whirlpool Corporation Geschirrspüler mit Sprühsystem
US9693672B2 (en) 2011-09-22 2017-07-04 Whirlpool Corporation Dishwasher with sprayer
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DE102011083579B3 (de) 2011-09-28 2012-11-22 Henkel Ag & Co. Kgaa Fluidausgabesystem
US9119517B2 (en) 2011-10-17 2015-09-01 Whirlpool Corporation Dishwasher having spray manifold and method for controlling same
US9295368B2 (en) 2013-03-01 2016-03-29 Whirlpool Corporation Dishwasher with hydraulically driven sprayer
US9532701B2 (en) 2013-03-01 2017-01-03 Whirlpool Corporation Dishwasher with sprayer
KR101998571B1 (ko) 2013-05-21 2019-07-10 삼성전자주식회사 노즐 어셈블리 및 이를 구비하는 식기세척기
US9713413B2 (en) 2013-07-01 2017-07-25 Whirlpool Corporation Dishwasher for treating dishes
US9532699B2 (en) 2013-07-15 2017-01-03 Whirlpool Corporation Dishwasher with sprayer
US10076224B2 (en) 2014-01-20 2018-09-18 Whirlpool Corporation Dishwasher
KR102355623B1 (ko) * 2015-06-19 2022-01-26 엘지전자 주식회사 식기세척기 및 그 제어방법
TR201613486A2 (tr) * 2016-09-27 2018-04-24 Arcelik As Bi̇r bulaşik maki̇nasi
TR201716903A2 (tr) * 2017-10-31 2019-05-21 Arcelik As Bi̇r yikama pervanesi̇
TR201716895A2 (tr) * 2017-10-31 2019-05-21 Arcelik As Bi̇r yikama pervanesi̇
US11147430B2 (en) 2019-03-27 2021-10-19 Midea Group Co., Ltd. Dishwasher including rack corner sprayers
CN117086043A (zh) * 2023-10-17 2023-11-21 常州诺清智能科技有限公司 一种喷淋清洗设备

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Also Published As

Publication number Publication date
IT1282596B1 (it) 1998-03-31
EP0795292A3 (de) 1997-09-24
DE69618563D1 (de) 2002-02-21
DE69618563T2 (de) 2002-08-01
ITMI960250A1 (it) 1997-08-09
EP0795292A2 (de) 1997-09-17
ITMI960250A0 (de) 1996-02-09

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