EP3970593A1 - Ensemble bras gicleur pour lave-vaisselle - Google Patents

Ensemble bras gicleur pour lave-vaisselle Download PDF

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Publication number
EP3970593A1
EP3970593A1 EP20197237.9A EP20197237A EP3970593A1 EP 3970593 A1 EP3970593 A1 EP 3970593A1 EP 20197237 A EP20197237 A EP 20197237A EP 3970593 A1 EP3970593 A1 EP 3970593A1
Authority
EP
European Patent Office
Prior art keywords
spray
arm
examples
dishwashing machine
constructed
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
Application number
EP20197237.9A
Other languages
German (de)
English (en)
Other versions
EP3970593B1 (fr
Inventor
Hamdullah Cihangir TOPAÇ
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.)
Vestel Elektronik Sanayi ve Ticaret AS
Original Assignee
Vestel Elektronik Sanayi ve Ticaret AS
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Publication date
Application filed by Vestel Elektronik Sanayi ve Ticaret AS filed Critical Vestel Elektronik Sanayi ve Ticaret AS
Priority to EP20197237.9A priority Critical patent/EP3970593B1/fr
Publication of EP3970593A1 publication Critical patent/EP3970593A1/fr
Application granted granted Critical
Publication of EP3970593B1 publication Critical patent/EP3970593B1/fr
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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
    • A47L15/4278—Nozzles
    • A47L15/4282—Arrangements to change or modify spray pattern or direction
    • 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
    • A47L15/14—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber
    • A47L15/18—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber with movably-mounted spraying devices
    • A47L15/22—Rotary spraying devices

Definitions

  • the present disclosure relates to a spray-arm assembly for a dishwashing machine and a dishwashing machine comprising the spray-arm assembly.
  • Dishwashing machines are used for washing items such as crockery and cutlery.
  • a known dishwashing machine comprises a washing compartment for holding one or more items to be washed, and a washing mechanism for washing those items.
  • a user can select from a plurality of pre-defined washing cycles via a user interface on a front face of the dishwashing machine.
  • a spray-arm apparatus for a dishwashing machine comprising: a spray-arm having a plurality of outlets for spraying liquid during a washing cycle, the plurality of outlets arranged along a length of the spray-arm between a rotational centre of the spray-arm and a distal end of the spray-arm; and a device for selectively causing a force to be applied to the spray-arm, so as to cause at least a portion of the spray arm to deflect, at least one of the plurality of outlets being located on the portion.
  • the device is constructed and arranged so that the applied force is dependent upon a rotational speed of the spray-arm.
  • the device is constructed and arranged so that the applied force increases as the rotational speed increases.
  • the spray arm apparatus is in communication with a controller, the controller arranged to control the rotational speed.
  • the controller is arranged to vary the rotational speed of the spray-arm during the washing cycle.
  • the controller is arranged so that during the washing cycle the rotational speed is varied according to one or more of: a square wave pattern; a trapezoidal wave pattern; a ladder-type wave pattern; a sinusoidal wave pattern.
  • the device comprises a linkage constructed and arranged to apply the force to the spray-arm, the linkage attached to the spray-arm at a first end of the linkage and attached to the device at a second end of the linkage.
  • the device comprises an actuator mechanism constructed and arranged to move the linkage.
  • the actuator mechanism comprises a tethered weight constructed and arranged to move under centrifugal force towards the distal end of the spray-arm as the spray-arm rotates.
  • the actuator mechanism is constructed and arranged so that the movement of the tethered weight causes movement of the linkage via a piston and cam assembly.
  • the weight is tethered by a spring, the spring constructed and arranged to bias the weight towards the rotational centre of the spray-arm.
  • the spray arm comprises an articulated joint between the rotational centre of the spray-arm and the distal end of the spray arm, at least one of the outlets being positioned between the distal end and the articulated joint.
  • a dishwashing machine comprising the spray-arm apparatus according to the first aspect.
  • the spray-arm apparatus is located in one or both of: an upper portion of the dishwashing machine; a lower portion of the dishwashing machine.
  • Dishwashing machines are used to automate the washing of items including crockery such as plates, bowls, cups, mugs etc. Items to be cleaned may also include cutlery such as knives, forks, spoons, or indeed any other cooking or eating utensil. Other items that may be washed include glassware, food containers etc.
  • FIG. 1 schematically shows an example of a dishwashing machine 100.
  • the dishwashing machine 100 comprises a main body 102, within which there is a washing compartment or chamber 104.
  • the washing compartment 104 comprises a lower portion 106 and an upper portion 108.
  • the lower portion 106 comprises a tray or rack 110 for holding items to be washed.
  • the upper portion 108 comprises a tray or rack 112 for holding items to be washed.
  • the racks 110 and 112 can be moved in and out of the washing compartment 104 on roller assemblies.
  • a washing mechanism 123 comprises spray arm 124 in lower portion 106, and spray arm 126 in upper portion 108.
  • spray arm 126 is omitted.
  • Each spray arm comprises a series of outlets (such as holes or nozzles) which can spray water upwardly and/or downwardly towards the items to be washed 114, while the spray arms 124 and 126 rotate.
  • the spray arm 124 is connected to shaft 125.
  • the shaft 125 enables rotation of spray arm 124 about a central axis of the shaft 125.
  • the shaft 125 and spray arm 124 may be considered to be comprised in a spray arm assembly 121.
  • the spray arm 126 is connected to shaft 127.
  • the shaft 127 enables rotation of spray arm 126 about a central axis of the shaft 127.
  • the shaft 127 and spray arm 126 may be considered to be comprised in a spray arm assembly 129.
  • the dishwashing machine 100 further comprises water inlet schematically shown at 128 and water outlet schematically shown at 130, for enabling water to be fed into and taken out of the dishwashing machine respectively.
  • a heater element (not shown) is provided for heating water as necessary.
  • hot and cold water is drawn from a building's supply as required.
  • a power connection is schematically shown at 132, which enables the dishwashing machine to be connected to mains electrical power for powering the dishwashing machine.
  • a water pump is schematically shown at 150.
  • the water pump 150 is constructed and arranged to distribute water around the dishwashing machine 100.
  • the water pump 150 can pump water to spray arms 124 and 126. Water that has been sprayed falls back down to a base or sump 152 of the dishwashing machine 100, from where that water can be recycled (after filtering, in some examples) by the pump 150.
  • rotation of the spray arms 124 and 126 is caused by the force of liquid being ejected from outlets of the spray arms. Additionally or alternatively, one or more motors, shown schematically at 148 may be provided for powering rotation of the spray arms 124 and 126.
  • a controller is schematically shown at 134 for controlling operations of the dishwashing machine.
  • the controller may comprise at least one memory and at least one processor.
  • the controller 134 can, for example, cause the dishwashing machine to operate according to one or more pre-determined washing cycles selected via a user interface 136.
  • the available washing cycles may differ from each other by temperature and/or duration, for example.
  • Via the user interface 136 a user may also be able to select whether the washing cycle is for a full or half load.
  • a display 138 is also provided which can display information to a user. This may include information such as confirming a user's washing cycle selection, as well as information such as time remaining of a washing cycle that is in progress.
  • a door of the dishwashing machine 100 is schematically shown at 140.
  • the door is in an open position enabling access to washing compartment 104.
  • a washing cycle generally comprises three main stages: (i) wetting; (ii) injection of detergent, (iii) rinsing. In some examples one or more of these steps may be omitted.
  • a rinse wash may include just a rinsing cycle. Whichever steps are included or not included, the washing of the washing load may be generally termed a washing cycle.
  • FIG. 2 is a schematic plan-view of a dishwashing machine 200 according to an example.
  • a washing compartment is shown at 204.
  • the washing compartment is generally square or rectangular in plan view.
  • a spray arm or spray propeller is shown at 226 (and various positions of the spray arm 226 are shown in phantom).
  • distal ends 276 of the spray-arm 226 trace a circular path within square washing compartment 204.
  • Blind spots may also occur in an unpredictable manner, for example where a large plate blocks a smaller plate.
  • the present disclosure relates to a spray-arm apparatus in which liquid outlet(s) of the spray-arm can be selectively oriented or angled to spray liquid (such as water and/or washing liquor) into the blind-spots of a washing compartment.
  • liquid such as water and/or washing liquor
  • some examples of the spray-arm apparatus comprise a mechanical system or device that is arranged to actuate under the centrifugal force of rotation of the spray-arm. This causes at least a portion of the spray-arm to deflect, and consequently alters a spray angle of one or more liquid outlets. Motion and operation of the spray-arm is, in some examples, controlled using electronic motion control.
  • FIG. 3 shows a spray-arm apparatus 329 according to an example.
  • the spray-arm apparatus 329 is, in this example, an upper spray-arm which is arranged to spray liquid downwardly within a dishwashing machine.
  • the concept is equally applicable to lower spray-arms that are arranged to spray upwardly within a washing compartment.
  • the spray-arm apparatus 329 has a plurality of outlets 364, 366, 368, 370 and 372 for spraying liquid during a washing cycle.
  • the plurality of outlets 364, 366, 368, 370 and 372 are arranged along a length of the spray-arm 326 between a rotational centre 374 of the spray-arm 326 and a distal-end 376 of the spray-arm 326. It will be understood that the number of outlets shown in Figure 3 is by way of example only and that in practice more or fewer outlets may be provided.
  • the outlets may also be referred to as holes or nozzles.
  • a device 378 is provided for selectively causing a force to be applied to the spray-arm326.
  • the applied force causes at least a portion 398 of the spray arm 326 to deflect. At least one of the plurality of outlets is located on the deflected portion 398. Accordingly, this alters an angle of liquid trajectory from one or more of the plurality of outlets 364, 366, 368, 370 and 372.
  • the force is applied in the region of or at the distal end 376 or tip of the spray-arm 326.
  • the angle of liquid trajectory is altered by changing an angle of one or more of the plurality of outlets 364, 366, 368, 370 and 372. In the example of Figure 3 , only the angle of outlet 372 is shown to be altered, though it will be understood that in practice the angle of more than one outlet may be altered.
  • the device is constructed and arranged so that the force that is applied to the spray arm 326 is dependent on a rotational speed of the spray-arm 326. In some examples, the device 376 is constructed and arranged so that the applied force increases as the rotational speed increases. In examples, the greater the applied force the greater the angle of deflection of the portion 398.
  • the device 378 may be considered, in some examples, as an actuator or comprising an actuator 379, because in examples the device 378 is arranged to actuate the force that is applied to the spray-arm 326.
  • the device comprises a linkage 380 that is attached to the spray-arm 326 in order to transfer or apply the force to the spray-arm 326 from the device 378.
  • the linkage 380 is attached to the spray-arm 326 at a first end 381 of the linkage and is attached to the device 378 at a second end 383 of the linkage 380.
  • the first end of the linkage 380 is attached to the distal end 376 of the spray-arm 326.
  • the linkage 380 comprises a rope or cable or wire or the like.
  • the device 378 comprises an actuator mechanism 379 constructed and arranged to cause movement of the linkage 380.
  • the actuator mechanism 379 comprises a tethered weight 388 constructed and arranged to move towards the distal end 379 of the spray-arm 326 as the spray-arm 326 rotates. That is, as the spray-arm 326 rotates, the centrifugal force causes the weight 388 to move outwardly from the rotational centre 374 of the spray-arm 326.
  • the actuator mechanism 379 is constructed and arranged so that movement of the tethered weight 388 causes movement of the linkage 380 via a piston 384 and cam 382 assembly.
  • the piston 384 is attached to the cam 382 via a linkage 386.
  • the linkage 386 may comprise a bar or rod or the like.
  • the weight 388 when weight 388 moves outwardly due to the centrifugal force of the spray-arm 326 rotating, the weight 388 pushes on piston 384 which causes cam 382 to rotate. This causes the linkage 380 to move and in turn lifts the end or tip of the spray-arm 326. As shown, this causes outlet 372 to be angled which increases the overall spray area of the spray-arm 326.
  • the weight 388 comprises a metal ball.
  • the weight 388 may comprise an iron ball.
  • the weight 388 is tethered to the device 378 by a spring 390.
  • spring 390 may comprise a helical spring.
  • the spring 390 is biased to draw or move the weight 388 back towards the rotational centre 374 of the spray-arm 326, for example as the spray-arm 326 slows down or stops moving. In-turn, and with respect to the example of Figure 3 , this will cause linkage 380 and outlet 372 to move, so that the deflection of portion 398 is decreased.
  • a rest-position of the portion 398 is horizontal or in-line with the rest of spray-arm 326.
  • outlet 372 is oriented vertically or substantially vertically e.g.
  • the piston 384 and/or cam 382 may in some examples be biased to orient the portion 398 to its rest position. Of course, once the spray-arm 326 is moving this biasing force may be overcome by the actuator 379. In some examples, no biasing element is provided for returning the portion 398 to its rest position, and it is instead allowed to return to its rest position under the force of gravity.
  • the device 378 comprises a casing or cover 385.
  • an interior of the cover 385 is oiled, to reduce friction between the cover and the weight 388 and/or piston 384.
  • the spray arm 326 comprises an articulated joint 392 between the rotational centre 374 of the spray-arm and the distal end 376 of the spray arm.
  • the articulated joint 392 comprises a hinge.
  • the hinge comprises a living hinge.
  • the hinge comprises a butt hinge.
  • at least one outlet is positioned between the distal end 376 of the spray arm 326 and the articulated joint 392.
  • a single outlet 372 is positioned between the articulated joint 392 and the distal end 376.
  • portion 398 comprises a portion of the spray-arm 326 between articulated joint 392 and distal end 376.
  • the spray arm 326 is formed of a material that is flexible enough so that the articulated joint 392 is not required.
  • actuator 379 may take forms that differ to that shown in Figure 3 .
  • an electrically powered actuator may be provided that provides the force to be applied to the spray-arm, rather than the mechanical arrangement of Figure 3 .
  • the device 378 comprises an actuator 379 for applying force to the spray arm to alter an angle of liquid trajectory from one or more of the outlets.
  • the spray-arm apparatus 329 has been described with respect to the right-hand side of Figure 3 . It will be understood that in examples the left-hand side of the apparatus 329 may operate in the same or a similar way.
  • the spray-arm apparatus 329 is in communication with a controller 334.
  • controller 334 is a controller of a dishwashing machine in which the spray-arm apparatus 329 is located.
  • the controller 334 is arranged to control the rotational speed of the spray-arm 326, for example by controlling a speed of motor 348.
  • the motor 348 comprises a brushless direct current (BLDC) motor.
  • the controller is arranged to vary the rotational speed of the spray-arm 326 during a washing cycle. This varies the spray trajectory of the spray-arm 326 during a washing cycle by varying the deflection of the spray-arm. This increases spray coverage during a washing cycle, and helps to eliminate blind-spots.
  • Figure 4 shows an example pattern by which the controller 334 may drive spray-arm 326.
  • Speed of the spray-arm is shown on the y-axis and time is shown on the x-axis.
  • time T represents one full revolution of the spray-arm 326.
  • the pattern in Figure 4 is a square pattern. For one revolution the spray-arm 326 is driven at a speed slower than a nominal speed (in this example 0.8*nominal speed), and for a subsequent revolution is driven at a speed higher than the nominal speed (in this example 1.2*nominal speed), and so on.
  • the spray-arm 326 may be driven according to a different pattern.
  • Such patterns may include: a trapezoidal wave pattern; a ladder-type wave pattern; a sinusoidal wave pattern.
  • the controller is arranged to use an algorithm for controlling movement of the spray-arm 326.
  • the algorithm comprises a look-up table (LUT).
  • the LUT contains spring constant k, angular velocity w of the spray arm 326, and mass m of the weight 388.
  • the elongation distance x determines the bending angle.
  • the bending angle may also be considered the amount by which portion 398 is deflected from its rest position.
  • the bending angle may be considered an angle formed between a non-deflected portion 393 of the spray-arm 326, and deflected portion 398 of the spray arm 326.
  • the bending angle determines capability to spray the corners or blind-spots of the washing compartment.
  • rotational speed of the spray-arm is set by controlling speed of motor 348. Therefore, controlling the speed of the motor 348 can also control the spray angle during a washing cycle, and accordingly varying the speed of the motor varies the spray angle. Therefore, different parts of the washing machine can be sprayed in a controlled manner during a washing cycle by controlling the speed of rotation of the spray arm 326.
  • the spray arm apparatus 329 is comprised in a dishwashing machine.
  • the spray-arm apparatus 329 may be comprised in dishwashing machine 100 or the like.
  • the spray-arm apparatus 329 may be an upper spray-arm apparatus or a lower spray-arm apparatus.
  • the outlets 364, 366, 368, 370 and 372 point downwardly. It will be understood that the disclosed concept can also be applied to a spray-arm apparatus where the liquid outlets point upwardly.
  • the disclosed spray-arm apparatus and dishwashing machine provides effective water spraying from the spray-arm to a washing compartment of a dishwashing machine. It will also be appreciated that in examples the spray-arm apparatus can be implemented using simple mechanical parts, with no or minimal addition of electronics. The spray-arm apparatus can be controlled using standard items of a dishwashing machine e.g. controller and motor.

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  • Washing And Drying Of Tableware (AREA)
EP20197237.9A 2020-09-21 2020-09-21 Ensemble bras gicleur pour lave-vaisselle Active EP3970593B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20197237.9A EP3970593B1 (fr) 2020-09-21 2020-09-21 Ensemble bras gicleur pour lave-vaisselle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20197237.9A EP3970593B1 (fr) 2020-09-21 2020-09-21 Ensemble bras gicleur pour lave-vaisselle

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EP3970593A1 true EP3970593A1 (fr) 2022-03-23
EP3970593B1 EP3970593B1 (fr) 2023-08-23

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2314009A (en) * 1996-06-14 1997-12-17 Daewoo Electronics Co Ltd Dispersing washing water of a dishwasher
EP3050480A1 (fr) * 2015-02-02 2016-08-03 LG Electronics Inc. Lave-vaisselle
WO2017211393A1 (fr) * 2016-06-07 2017-12-14 Arcelik Anonim Sirketi Moyen de pulvérisation amélioré destiné à être utilisé dans un lave-vaisselle
CN105286752B (zh) * 2015-11-20 2018-10-26 佛山市顺德区美的洗涤电器制造有限公司 用于洗碗机的喷臂组件及具有其的洗碗机
WO2018228679A1 (fr) * 2017-06-14 2018-12-20 Haier Deutschland GmbH Lave-vaisselle et procédé de fonctionnement d'un lave-vaisselle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2314009A (en) * 1996-06-14 1997-12-17 Daewoo Electronics Co Ltd Dispersing washing water of a dishwasher
EP3050480A1 (fr) * 2015-02-02 2016-08-03 LG Electronics Inc. Lave-vaisselle
CN105286752B (zh) * 2015-11-20 2018-10-26 佛山市顺德区美的洗涤电器制造有限公司 用于洗碗机的喷臂组件及具有其的洗碗机
WO2017211393A1 (fr) * 2016-06-07 2017-12-14 Arcelik Anonim Sirketi Moyen de pulvérisation amélioré destiné à être utilisé dans un lave-vaisselle
WO2018228679A1 (fr) * 2017-06-14 2018-12-20 Haier Deutschland GmbH Lave-vaisselle et procédé de fonctionnement d'un lave-vaisselle

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Publication number Publication date
EP3970593B1 (fr) 2023-08-23

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