EP2822441B1 - Device for moving washing impellers for washing and/or drying devices - Google Patents
Device for moving washing impellers for washing and/or drying devices Download PDFInfo
- Publication number
- EP2822441B1 EP2822441B1 EP13720566.2A EP13720566A EP2822441B1 EP 2822441 B1 EP2822441 B1 EP 2822441B1 EP 13720566 A EP13720566 A EP 13720566A EP 2822441 B1 EP2822441 B1 EP 2822441B1
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- EP
- European Patent Office
- Prior art keywords
- arm
- rotary sprayer
- wash
- wash chamber
- rotary
- 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.)
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Classifications
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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
- A47L15/14—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
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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
- A47L15/14—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
- A47L15/23—Rotary spraying devices moved by means of the sprays
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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
- A47L15/44—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants
Definitions
- the present invention relates to a device for moving washing impellers or sprayers within wash chambers of washing appliances. Said device is applied to a washing and/or drying machine, e.g. a dishwasher.
- a washing and/or drying machine e.g. a dishwasher.
- Dishwashers which, for washing crockery in the wash chamber, comprise at least two rotary sprayers, e.g. a rotary sprayer for washing the upper portion of the chamber, in particular crockery arranged on an upper rack, if available, and a lower rotary sprayer for washing the lower portion of the same wash chamber, in particular crockery arranged on a lower rack.
- said washing machines comprise two racks, i.e. a first upper rack and a second lower rack, each associated with at least one rotary sprayer.
- the rotary motion of the sprayer is attained by exploiting the inclination of the water jet generated by a plurality of nozzles.
- the nozzles are appropriately arranged in a manner such that the force of the exiting water generates an equal and opposite force onto the sprayer, which will thus rotate, e.g. about a vertical axis.
- a further problem observed during the washing for the lower rotary sprayer relates to the possibility that the latter might strike against improperly positioned crockery, such as cutlery, which might obstruct the sprayer as it turns, thus preventing it from correctly washing some areas of the rack.
- the lower rotary sprayer comprises nozzles having greater diameters than the other rotary sprayers, so as to ensure a stronger impact of the water against the crockery, resulting however in higher water consumption.
- Rotary sprayers are also known which are removably mounted to the bottom base of the wash chamber and which are adapted to rotate, under the hydrodynamic thrust of water exiting through a plurality of nozzles, about a vertical axis located at the centre of the wash chamber.
- Such a rotary sprayer for washing the central portion of the wash chamber comprises just a single jet that directs a water jet along said axis of rotation, thus reducing the cleaning power in the central part of the wash chamber.
- Arms are also known, whereto one or more rotary sprayers may be secured in different manners. Normally, such arms are idle and are mounted on rolling bearings. Such devices are moved by the hydrodynamic thrust of water. In fact, the hydrodynamic thrust of water causes the sprayers to rotate and, through a satellite movement, also moves said arm. This solution does not allow to determine the position of the arm and, as a consequence, the position of the rotary sprayer within the wash chamber, in particular in which section of the rack it is located.
- Patent application EP1132039 describes arms adapted to be moved by actuator means. Through a cam system, the arm can, as it moves, move the rotary sprayer along an ellipsoidal orbit. Said actuators allow the arm to rotate by 180° at most, as clearly shown in the drawings.
- dishwashers comprise an alternate wash assembly adapted to switch and distribute fluid flows from an inlet, connected to a supply circuit, e.g. the water main, or from a closed circuit, to one or more outlets, connected to one or more hydraulic circuits, in turn connected to said one or more rotary sprayers.
- a supply circuit e.g. the water main
- outlets e.g. the water main
- hydraulic circuits e.g. the hydraulic circuits
- Said alternate wash assembly is actuated by a motor that drives a selector which, depending on its rotation, opens and/or closes one or more hydraulic output circuits in accordance with a predetermined wash program that defines the portion of the wash chamber to be washed.
- control of the movement device or arm is ensured by an actuator which is independent of the actuator included in the alternate wash assembly. This implies the impossibility of having the sprayer stop at all points, because the actuator only has two positions or states.
- Arm movement devices are also known wherein an actuator moves said arm, which is associated with at least one rotary sprayer.
- Such movement devices comprise a part of the mechanism for transmitting motion from the actuator to the device or arm inside the wash chamber. This implies that such mechanism portions must be properly insulated to protect said transmission mechanism against corrosion induced by water and to avoid that dirt residues might deposit into sensitive portions of the device, which might lead to arm seizure.
- Rotary sprayer movement devices which, through at least two motors, can move a rotary sprayer in an XY plane in order to wash specific sectors of the rack.
- Such a device requires two actuators in order to move said rotary sprayer in space, and most of the drive mechanisms are within the wash chamber, resulting in the above-mentioned problems of corrosion or dirt accumulation.
- controlling the proper positioning of the rotary sprayer in the desired point is a very complex task, because at least one position sensor is required for each axis along which said rotary sprayer can move.
- the duct supplying water to the rotary sprayer be flexible, so that it can follow the sprayer's movements. The necessity of using a flexible duct may cause an interruption in the water flow to the rotary sprayer because of undesired duct occlusions due, for example, to bottlenecks or pressures normally caused by the crockery.
- Devices for moving the rotary sprayer within the wash chamber which allow said rotary sprayer to be moved through rotation of an arm. Movement is only possible for small angles of rotation; during said movement, moreover, rotation of the rotary sprayer is prevented by, for example, the walls of the wash chamber.
- Patent application EP 1 090 579 A1 discloses a revolving sprinkling assembly for dishwasher includes a sprinkler and a device for shifting said sprinkler consisting of a mobile support means for the sprinkler and an actuator means for driving the mobile support means.
- the latter may consist of a rotating shaft provided at the top with a transverse extension at whose free end there is pivoted the sprinkler, so that the axis of rotation of the latter is eccentric with respect to axis of rotation of the shaft, or consist of a translating duct slidably engaged onto a feed box.
- the shifting of the mobile support means is achieved through a toothed rim or a rack engaged with a gear driven into rotation by a thermo-actuator or by a motor.
- the present invention aims at solving the above-mentioned technical problems of the prior art by providing a device for rotatably moving at least one rotary sprayer, thus allowing the rotary sprayer to be positioned in the desired zones of the wash chamber.
- One aspect of the present invention relates to a movement device having the features set out in the appended claim 1.
- a further aspect of the present invention relates to a dishwasher having the features set out in the appended claim 7.
- the device for moving at least one rotary sprayer 5, which is adapted to rotate about a first axis "R”, comprises an arm 3 capable of rotating by 360° about a second axis "Z", preferably vertical, on which said rotary sprayer 5 is rotatably mounted; at least one actuating device 2, which is adapted to rotate said arm 3 about said second axis "Z".
- Said arm is preferably asymmetric and comprises a single rotary sprayer 5 mounted in the proximity of a peripheral portion 33 of the same arm 3.
- said actuating device 2 connected in the proximity of a coupling portion 32 of arm 3, selectively rotates the same arm 3 in order to position said rotary sprayer 5 at desired angles of rotation of arm 3 about said second axis "Z".
- said actuating device 2 is connected to arm 3 at coupling portion 32 of arm 3 and to the rest of the structure of the washing appliance equipped with the movement device.
- said actuating device 2 comprises an actuator 21, preferably one motor and at least one motion transmission mechanism 22, which is adapted to transmit motion from said actuator or motor 21 to said at least one arm 3. More preferably, said motion transmission mechanism 22 comprises at least one shaft 221b fitted on one end to coupling portion 32 of arm 3 and on the opposite end to the shaft of motor 21, so that the second axis of rotation "Z" of arm 3 corresponds to the axis of rotation of shaft 221b.
- said shaft 221b is fitted on one end to a joining element 30 comprised in said coupling portion 32.
- said arm 3 is mounted on rolling bearings that allow arm 3 to rotate by 360° about said second axis "Z".
- Said arm 3 is connected to the hydraulic circuit intended for rotary sprayer 5.
- arm 3 In addition to supporting associated rotary sprayer 5, arm 3 also acts as a duct for supplying water to rotary sprayer 5.
- Arm 3 fitted on said second shaft 221b, comprises an internal duct 31 allowing water to flow towards rotary sprayer 5.
- said arm 3 is an asymmetric arm, since it comprises a coupling portion 32 in the proximity of one end of said arm 3 and a peripheral portion 33 at the opposite end of said arm 3, on which at least one rotary sprayer 5 is mounted. Said coupling portion 32 also defines a first portion of duct 31, thereby allowing the fluids to flow towards rotary sprayer 5.
- Said washing and/or drying machine is preferably a dishwasher 1 comprising an outer casing 10, a wash chamber 11, at least one rotary sprayer 5 for distributing wash fluid for washing crockery, as shown by way of example in Figure 8 .
- said movement device is located in the proximity of an alternate wash assembly 4 adapted to switch and distribute fluid flows from an inlet 44, connected to a supply circuit, to one or more outlets (43a, 43b), connected to one or more hydraulic circuits.
- an alternate wash assembly 4 adapted to switch and distribute fluid flows from an inlet 44, connected to a supply circuit, to one or more outlets (43a, 43b), connected to one or more hydraulic circuits.
- Inlet 44 of said alternate wash assembly 4 is connected to a wash pump, which takes water from a water collecting sump 6, located in the proximity of said arm 3, thereby creating a closed supply circuit; said one or more outlets 43a, 43b are connected to as many hydraulic circuits, which are adapted to transport fluids, e.g. water, to the various zones of the wash chamber for distribution.
- said alternate wash assembly comprises a first outlet 43a, which is connected to a hydraulic circuit adapted to supply an upper rotary sprayer (not shown); and a second outlet 43b, which is connected to a hydraulic circuit adapted to supply lower rotary sprayer 5.
- said alternate wash assembly 4 shown by way of example in Figures 6A, 6B and 6C , comprises a chamber 41 in which a selector 42 is arranged. Said selector 42 is adapted to selectively open and/or close one or more outlets (43a, 43b) depending on which hydraulic circuit must be activated and/or deactivated.
- said selector 42 is moved by means of said actuating device 2.
- selector 42 in use may vary depending on design specifications.
- the operation of the alternate wash assembly 4 will not be described in detail herein, since it is known to those skilled in the art.
- chamber 41 internally comprises at least one heating means 46, e.g. a resistor, adapted to selectively heat the fluid, e.g. water, that must be directed to the various hydraulic circuits connected to alternate wash assembly 4.
- heating means 46 allows to eliminate the pressure switch normally included in prior-art dishwashers 1, along with the associated take-off on sump 6 and welding of the sump 6.
- Said at least one heating means 46 comprises safety devices 461, which are connected to a central control unit 8.
- said safety devices 461 are electric/pneumatic and comprise at least one sensor 462 and a switch adapted to determine the temperature and/or the pressure of the fluid and to deactivate said at least one heating means 46 when a preset temperature is reached or if the pressure drops.
- temperature sensor 462 is monitored by said control unit 8, which, when it detects a temperature equal to or higher than a preset maximum temperature, will turn off heating device 46 by opening the electric circuit.
- sensor 462 will either open the switch directly or send a signal, e.g. to control unit 8, for opening the switch and turning off heating means 46.
- said control unit 8 will open the switch, thereby opening the circuit of heating device 46, should any current dispersion occur which might be potentially dangerous for the user of dishwasher 1.
- said alternate wash assembly 4 may comprise a third outlet 43c adapted to be connected to a hydraulic circuit comprising a water recovery container (not shown in the drawings) or a drying device.
- said actuating device 2 comprises an actuator 21, preferably a single motor, and at least one motion transmission mechanism 22, adapted to transmit motion from said actuator or motor 21 to said at least one arm 3.
- Said motion transmission mechanism 22 may also be adapted to transmit motion from said actuator or motor 21 to said at least one alternate wash assembly 4.
- said arm 3 is located within wash chamber 11; instead, said at least one actuating device 2 is external to the same wash chamber 11 of said washing machine 1 whereto said movement device has been applied.
- said actuating device 2 is preferably arranged underneath the bottom base of wash chamber 11, thus being protected against the action of water, and particularly not being in direct contact with either the wash water or dirt residues resulting from the various wash steps, so that any corrosion or seizure of the motion transmission mechanisms 22 is prevented.
- Said actuating device 2 is in turn controlled by a central control unit 8 for the purpose of allowing said at least one arm 3 to be placed into desired positions inside the wash chamber for predetermined time periods.
- central control unit 8 is susceptible of being connected to said motor 21.
- said central control unit 8 is adapted to execute a wash program of same dishwasher 1, which specifies the positions and the stop times of rotary arm 3 within wash chamber 11.
- Said control unit 8 may be connected to a memory unit 81 storing at least one wash program.
- Said control unit 8 may possibly comprise said memory unit 81.
- arm 3 is always positioned in such a way that rotary sprayer 5 is in a predetermined sector of wash chamber 11.
- arm 3 may possibly stop in a predetermined position prior to the beginning of the next wash cycle.
- Central control unit 8 is adapted to activate other devices normally included in dishwasher 1 and to monitor a plurality of sensors which are useful for controlling the same dishwasher. Such devices and sensors will not be described in detail herein, since they are known to those skilled in the art.
- arm 3 is rotatably supported around a fixed axis, preferably around said second axis "Z", which is located in the proximity of the centre of the base of wash chamber 11.
- said arm 3 is located in the proximity of sump 6 comprised in wash chamber 11.
- Rotary arm 3 has a predetermined revolution speed.
- the revolution speed of arm 3 may be a multiple or submultiple of the revolution speed of selector 42 of the alternate wash assembly.
- said motion transmission mechanism 22 comprises a shaft 221b fitted on one end to a joining element 30 of arm 3 and on the opposite end to the shaft of motor 21.
- Said motor 21 is an electric motor, e.g. a step motor, as normally used for the devices included in the dishwasher.
- the maximum torque of said motor 21 is limited in order to avoid any damage to actuating device 2 which might be due, for example, to an improperly positioned piece of cutlery stopping the rotation of the arm.
- said motion transmission mechanism 22 comprises a first shaft 221a fitted on one end to said selector 42 of the alternate assembly 4 and on the opposite end to the shaft of motor 21; a second shaft 221b is fitted on one end to a joining element 30 of arm 3 and on the opposite end to a pinion 222b, which meshes with a crown wheel 222a mounted to said first shaft 221a.
- the ratio between said crown wheel 222a and said pinion 222b is such that the revolution speed of the first shaft 221a is a multiple of the revolution speed of said second shaft 221b.
- said actuating device 2 comprises at least one sensor 24 adapted to detect the position of said at least one arm 3 within wash chamber 11 of a washing machine 1, and possibly also the position of selector 42 of the alternate wash assembly.
- Said at least one sensor 24 is, for example, an encoder, mounted to said shaft 221b and adapted to determine the direction of rotation of arm 3 and the absolute position thereof within wash chamber 11, with a predetermined uncertainty, as a function of the rotation of shaft 221b.
- Said at least one sensor 24 may be a position sensor of any type, such as, for example, capacitive, resistive, inductive, etc.
- Said at least one sensor 24 is susceptible of being connected to said control unit 8 for the purpose of determining the position of arm 3, so that rotary sprayer 5 can be positioned as required within the wash chamber.
- said sensor 24 allows rotary sprayer 5 to be positioned in a desired zone of wash chamber 11 through an appropriate movement of arm 3.
- control unit 8, depending on the data received from said sensor 24, can operate motor 21 in a manner such as to place rotary sprayer 5 into the desired position by rotating said arm 3.
- Said arm 3 is connected to the hydraulic circuit intended for lower rotary sprayer 5.
- arm 3 is mounted through fastening means 62 to said second outlet 43b, which is located in a housing within sump 6.
- arm 3 In addition to supporting associated rotary sprayer 5, arm 3 also acts as a duct to supply water to rotary sprayer 5, e.g. from the second outlet 43b of alternate assembly 4, to which it is connected.
- said arm 3 is mounted on, rolling bearings that allow arm 3 to rotate by 360° about said second axis "Z".
- arm 3 is fitted to said second shaft 221b, but comprises an internal duct 31 allowing water to flow from the alternate wash assembly 4 to rotary sprayer 5.
- said arm 3 is an asymmetric arm, since it comprises a coupling portion 32 in the proximity of one end of said arm 3, and a peripheral portion 33 at the opposite end of said arm 3, where only one rotary sprayer 5 is mounted.
- Said coupling portion 32 comprises said joining element 30 fitted to said shaft 221b, so that the second axis of rotation "Z" of arm 3 corresponds to the axis of rotation of shaft 221b.
- Said coupling portion 32 also defines a first portion of duct 31, thereby allowing fluids to flow, for example, from said alternate wash assembly 4 to rotary sprayer 5.
- said arm 3 is made of plastic material, comprising an upper portion 3a and a lower portion 3b that can be removably combined together, as shown in Figures 4A and 5A .
- said joining element 30 comprises at least one torque limiting means 23 adapted to disengage arm 3, preferably arranged in said coupling portion 32.
- torque limiting means 23 comprises a selective abutment element 231 appropriately associated with said joining element 30, which is adapted to abut against the inner walls of internal duct 31 in coupling portion 32; an elastic means 232, e.g. a spring, and a top element 233.
- torque limiting means 23 of the first embodiment is such that, following the release of arm 3, a new balance point will be reached after a rotation of shaft 221b by approximately 360°, so that it can rotate about said second axis "Z", driven by said motor 21.
- This torque limiting means 23 has one balance point.
- joining element 30 comprises an abutment portion 234 made of ferrous or ferromagnetic material, which is adapted to abut against a magnetic element 235, so that interference therebetween is generated through magnetic effect, thereby allowing motion to be transmitted to arm 3 by shaft 221b.
- a predetermined torque value of shaft 221b is exceeded, the magnetic force between abutment portion 234 and interference element 235 becomes smaller than the force applied to arm 3, so that abutment element 234 will move away from magnetic element 235, thereby preventing motion from being transmitted to said arm 3.
- This torque limiting means 23 therefore, has only one balance point when abutment element 234 is in the proximity of magnetic element 235, preferably when they face towards each other, so that the magnetic force will tend to hold them abutted against each other.
- said rotary sprayer 5 is a symmetric satellite sprayer rotating about said first axis of rotation "R", which is parallel to the second axis of rotation "Z" of arm 3.
- Rotary sprayer 5 has preferably a tapered shape, its dimensions, e.g. in the longitudinal direction, being smaller than the standard dimensions used for conventional lower rotary sprayers.
- the longitudinal extension of rotary sprayer 5, which is secured to arm 3 in accordance with the present invention is at most equal to half the smallest dimension of the base of wash chamber 11.
- said rotary sprayer 5 is mounted onto a suitable through housing 34 comprised in peripheral portion 33 of arm 3.
- Said housing 34 is adapted to allow rotary sprayer 5 to rotate freely, as well as to allow the wash fluid to flow towards said rotary sprayer 5.
- the same rotary sprayer 5 comprises an engagement mouth 52, which is adapted to fit into said housing 34 to allow the fluid to flow into rotary sprayer 5 and come out through a plurality of nozzles 51 in order to hit the crockery arranged in a lower rack positioned inside wash chamber 11 of dishwasher 1.
- Said nozzles 51 are appropriately arranged on said rotary sprayer 5, preferably on the upper portion of said rotary sprayer 5, and have predetermines sizes.
- the sizes of said nozzles 51 are smaller than the average sizes of the nozzles comprised in the lower rotary sprayers currently available on the market.
- Said engagement mouth 52 comprises removable locking means 53, e.g. interference means, which are adapted to retain said rotary sprayer 5 in order to prevent it from accidentally detaching from said arm 3.
- removable locking means 53 e.g. interference means, which are adapted to retain said rotary sprayer 5 in order to prevent it from accidentally detaching from said arm 3.
- Internal duct 31 of arm 3, under said suitable housing 34, comprises a protuberance 311 which is appropriately shaped to avoid any fluid flow turbulences in duct 31 and to direct the same fluid into rotary sprayer 5.
- arm 3 according to the present invention comprises at least one nozzle 51 to increase the wash power, preferably located in upper portion 3a of the same arm 3.
- the movement device according to the present invention can be applied to a vapor circuit or to a hydraulic circuit for water at a higher temperature than the fluid coming from alternate wash assembly 4.
- internal duct 31 of arm 3 can be used for conducting water vapor towards the same rotary sprayer 5 when the latter is positioned under the crockery, for improving the washing or drying action.
- the longitudinal extension of rotary sprayer 5 according to the present invention is half the longitudinal extension of current lower rotary sprayers.
- the movement of arm 3 about said second vertical axis "Z" and the small dimensions of rotary sprayer 5 allow to wash a portion of the rack, e.g. only one fourth of the rack, thus reducing the water consumption, also because of the smaller number of nozzles 51.
- the longitudinal dimension of arm 3 is smaller than 12.5 cm, while the rotary sprayer has a longitudinal extension of less than 25 cm.
- the number of nozzles 51 of lower rotary sprayer 5 is halved.
- arm 3 allows arm 3 to be positioned in a manner such that the fluid jets from nozzles 51 of arm 3 and/or of rotary sprayer 5 are at least partly directed towards a detergent dispenser 14 comprised in dishwasher 1, into which the user has previously poured a predetermined quantity of detergent.
- a detergent dispenser 14 comprised in dishwasher 1, into which the user has previously poured a predetermined quantity of detergent.
- the possibility of intentionally directing the fluid jets towards said detergent dispenser allows dissolving the detergent into the fluid as a function of the wash step to be carried out.
- rotary sprayer 5 and the rotation of arm 3 about said second vertical axis "Z" allow to improve the washing in the central zone of wash chamber 11 of dishwasher 1, by improving the trajectories of the fluid jets coming from the rotary sprayer.
- the smaller number of nozzles 51 and the possibility of changing the position of rotary sprayer 5 within wash chamber 11 ensure a lower consumption of liquid, in particular water, used for washing the crockery.
- the smaller quantity of wash water required allows to reduce the capacity of the wash pump and the power of the associated motor, resulting in lower production costs.
- Positioning the rotary sprayer into particular sectors of wash chamber 11 allows to improve the wash performance, in that it is possible to change the stop times of rotary sprayer 5 in the various positions depending on the wash program in execution.
- the movement device according to the present invention allows to position the rotary sprayer in the desired zones of wash chamber 11 through the use of a simple actuating device. Furthermore, the movement device is safe and immune from malfunctions or damage typically suffered by prior-art devices, because motion transmission mechanism 22 is insulated and cannot be corroded by wash fluids, nor can it be subject to dirt accumulation, which might damage the mechanism itself.
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- Washing And Drying Of Tableware (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Cleaning In General (AREA)
- Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
- Centrifugal Separators (AREA)
Description
- The present invention relates to a device for moving washing impellers or sprayers within wash chambers of washing appliances. Said device is applied to a washing and/or drying machine, e.g. a dishwasher.
- Dishwashers are known which, for washing crockery in the wash chamber, comprise at least two rotary sprayers, e.g. a rotary sprayer for washing the upper portion of the chamber, in particular crockery arranged on an upper rack, if available, and a lower rotary sprayer for washing the lower portion of the same wash chamber, in particular crockery arranged on a lower rack. Preferably, said washing machines comprise two racks, i.e. a first upper rack and a second lower rack, each associated with at least one rotary sprayer.
- Normally the rotary motion of the sprayer is attained by exploiting the inclination of the water jet generated by a plurality of nozzles. In fact, the nozzles are appropriately arranged in a manner such that the force of the exiting water generates an equal and opposite force onto the sprayer, which will thus rotate, e.g. about a vertical axis.
- Among the rotary sprayers installed in a wash chamber, the one that washes crockery with most difficulty is the lower rotary sprayer that must wash the lower rack, where crockery particularly difficult to wash is normally placed, such as pots, dishes and cutlery. Such pieces of crockery give rise to several wash problems because they may be heavily encrusted or may have shapes that do not allow water to be properly incident on their surfaces.
- A further problem observed during the washing for the lower rotary sprayer relates to the possibility that the latter might strike against improperly positioned crockery, such as cutlery, which might obstruct the sprayer as it turns, thus preventing it from correctly washing some areas of the rack.
- To improve the washing action, the lower rotary sprayer comprises nozzles having greater diameters than the other rotary sprayers, so as to ensure a stronger impact of the water against the crockery, resulting however in higher water consumption.
- Loading pieces of crockery such as pots creates another problem for sprayer rotation. When pots are not properly arranged, in fact, their shape may cause the water jet to splash back from them, sometimes in a direction opposite to the rotary motion of the sprayer, thus reducing its revolution speed or even causing it to temporarily stop.
- The above-described problems do not allow to obtain an optimal washing result of the lower rack as the loaded crockery and/or the arrangement thereof varies, implying that some sections of the wash chamber and/or of the single rack may be washed better than the remaining portions of the rack and/or of the wash chamber.
- Rotary sprayers are also known which are removably mounted to the bottom base of the wash chamber and which are adapted to rotate, under the hydrodynamic thrust of water exiting through a plurality of nozzles, about a vertical axis located at the centre of the wash chamber. Such a rotary sprayer for washing the central portion of the wash chamber comprises just a single jet that directs a water jet along said axis of rotation, thus reducing the cleaning power in the central part of the wash chamber.
- Arms are also known, whereto one or more rotary sprayers may be secured in different manners. Normally, such arms are idle and are mounted on rolling bearings. Such devices are moved by the hydrodynamic thrust of water. In fact, the hydrodynamic thrust of water causes the sprayers to rotate and, through a satellite movement, also moves said arm. This solution does not allow to determine the position of the arm and, as a consequence, the position of the rotary sprayer within the wash chamber, in particular in which section of the rack it is located.
- Devices or arms are also known which, through suitable actuating devices, can be driven in a manner such as to move at least one associated rotary sprayer to different areas of the wash chamber in order to improve the cleaning action. Patent application
EP1132039 describes arms adapted to be moved by actuator means. Through a cam system, the arm can, as it moves, move the rotary sprayer along an ellipsoidal orbit. Said actuators allow the arm to rotate by 180° at most, as clearly shown in the drawings. - Normally, in order to direct the water towards the various rotary sprayers included in the wash chamber, dishwashers comprise an alternate wash assembly adapted to switch and distribute fluid flows from an inlet, connected to a supply circuit, e.g. the water main, or from a closed circuit, to one or more outlets, connected to one or more hydraulic circuits, in turn connected to said one or more rotary sprayers.
- Said alternate wash assembly is actuated by a motor that drives a selector which, depending on its rotation, opens and/or closes one or more hydraulic output circuits in accordance with a predetermined wash program that defines the portion of the wash chamber to be washed.
- In the prior art, control of the movement device or arm is ensured by an actuator which is independent of the actuator included in the alternate wash assembly. This implies the impossibility of having the sprayer stop at all points, because the actuator only has two positions or states.
- Arm movement devices are also known wherein an actuator moves said arm, which is associated with at least one rotary sprayer. Such movement devices comprise a part of the mechanism for transmitting motion from the actuator to the device or arm inside the wash chamber. This implies that such mechanism portions must be properly insulated to protect said transmission mechanism against corrosion induced by water and to avoid that dirt residues might deposit into sensitive portions of the device, which might lead to arm seizure.
- Rotary sprayer movement devices are known which, through at least two motors, can move a rotary sprayer in an XY plane in order to wash specific sectors of the rack. Such a device requires two actuators in order to move said rotary sprayer in space, and most of the drive mechanisms are within the wash chamber, resulting in the above-mentioned problems of corrosion or dirt accumulation. In addition, controlling the proper positioning of the rotary sprayer in the desired point is a very complex task, because at least one position sensor is required for each axis along which said rotary sprayer can move. It is also necessary that the duct supplying water to the rotary sprayer be flexible, so that it can follow the sprayer's movements. The necessity of using a flexible duct may cause an interruption in the water flow to the rotary sprayer because of undesired duct occlusions due, for example, to bottlenecks or pressures normally caused by the crockery.
- Devices for moving the rotary sprayer within the wash chamber are also known which allow said rotary sprayer to be moved through rotation of an arm. Movement is only possible for small angles of rotation; during said movement, moreover, rotation of the rotary sprayer is prevented by, for example, the walls of the wash chamber.
-
Patent application EP 1 090 579 A1 discloses a revolving sprinkling assembly for dishwasher includes a sprinkler and a device for shifting said sprinkler consisting of a mobile support means for the sprinkler and an actuator means for driving the mobile support means. The latter may consist of a rotating shaft provided at the top with a transverse extension at whose free end there is pivoted the sprinkler, so that the axis of rotation of the latter is eccentric with respect to axis of rotation of the shaft, or consist of a translating duct slidably engaged onto a feed box. The shifting of the mobile support means is achieved through a toothed rim or a rack engaged with a gear driven into rotation by a thermo-actuator or by a motor. - The present invention aims at solving the above-mentioned technical problems of the prior art by providing a device for rotatably moving at least one rotary sprayer, thus allowing the rotary sprayer to be positioned in the desired zones of the wash chamber.
- One aspect of the present invention relates to a movement device having the features set out in the appended
claim 1. - A further aspect of the present invention relates to a dishwasher having the features set out in the appended claim 7.
- Auxiliary features of the movement device and of the dishwasher are set out in respective dependent claims appended hereto.
- The features and advantages of the device and of the dishwasher according to the present invention will become more apparent from the following patent description of at least one embodiment thereof and from the annexed drawings, wherein:
-
Figure 1 shows a perspective view of the movement device according to the present invention; -
Figure 2 shows an exploded view of the device ofFig. 1 ; -
Figure 3A is a sectional side view of the device ofFigure 1 , in a first embodiment thereof; -
Figure 3B is a perspective view of a preferred embodiment of the actuating device according to the present invention; -
Figures 4A, 4B and 4C show the arm of the movement device according to the present invention, comprising a first embodiment of the torque limiting means; in particular,Figure 4A is an exploded view of the arm of the movement device according to the present invention,Figure 4B is a sectional side view of the same arm,Figure 4C is an exploded view of the torque limiting means in a first embodiment thereof; -
Figures 5A, 5B and 5C show the arm of the movement device according to the present invention, comprising a second embodiment of the torque limiting means; in particular,Figure 5A is an exploded view of the arm of the movement device according to the present invention,Figure 5B is a sectional side view of the same arm,Figure 5C is an exploded view of the torque limiting means in a second embodiment thereof; -
Figures 6A, 6B and 6C show, in different views, the alternate wash assembly; in particular,Figure 6A is a top view of the alternate wash assembly;Figure 6B is a sectional view of a first embodiment of the alternate wash assembly;Figure 6C is an exploded view of a second embodiment of the alternate wash assembly, comprising fluid heating means; -
Figures 7A and 7B show alternative embodiments of the movement device according to the present invention; in particular,Figure 7A shows the alternate wash assembly comprising an additional third outlet,Figure 7B shows a movement device to which a vapor circuit can be applied; -
Figure 8 is a perspective view of a dishwasher comprising a movement device according to the present invention; -
Figure 9 is a circuit block diagram of the electronic devices connected to a central control unit; -
Figure 10 is an exploded view of a variant of the arm ofFigure 1 . - With reference to the above-mentioned drawings, the device for moving at least one
rotary sprayer 5, which is adapted to rotate about a first axis "R", comprises anarm 3 capable of rotating by 360° about a second axis "Z", preferably vertical, on which saidrotary sprayer 5 is rotatably mounted; at least oneactuating device 2, which is adapted to rotate saidarm 3 about said second axis "Z". - Said arm is preferably asymmetric and comprises a single
rotary sprayer 5 mounted in the proximity of aperipheral portion 33 of thesame arm 3. - Preferably, said actuating
device 2, connected in the proximity of acoupling portion 32 ofarm 3, selectively rotates thesame arm 3 in order to position saidrotary sprayer 5 at desired angles of rotation ofarm 3 about said second axis "Z". - Preferably, said actuating
device 2 is connected toarm 3 atcoupling portion 32 ofarm 3 and to the rest of the structure of the washing appliance equipped with the movement device. - In the preferred embodiment, said actuating
device 2 comprises anactuator 21, preferably one motor and at least onemotion transmission mechanism 22, which is adapted to transmit motion from said actuator ormotor 21 to said at least onearm 3. More preferably, saidmotion transmission mechanism 22 comprises at least oneshaft 221b fitted on one end tocoupling portion 32 ofarm 3 and on the opposite end to the shaft ofmotor 21, so that the second axis of rotation "Z" ofarm 3 corresponds to the axis of rotation ofshaft 221b. - Preferably, said
shaft 221b is fitted on one end to a joiningelement 30 comprised in saidcoupling portion 32. - In particular, said
arm 3 is mounted on rolling bearings that allowarm 3 to rotate by 360° about said second axis "Z". - Said
arm 3 is connected to the hydraulic circuit intended forrotary sprayer 5. - In addition to supporting associated
rotary sprayer 5,arm 3 also acts as a duct for supplying water torotary sprayer 5. -
Arm 3, fitted on saidsecond shaft 221b, comprises aninternal duct 31 allowing water to flow towardsrotary sprayer 5. - As shown in the drawings, said
arm 3 is an asymmetric arm, since it comprises acoupling portion 32 in the proximity of one end of saidarm 3 and aperipheral portion 33 at the opposite end of saidarm 3, on which at least onerotary sprayer 5 is mounted.
Saidcoupling portion 32 also defines a first portion ofduct 31, thereby allowing the fluids to flow towardsrotary sprayer 5. - Said washing and/or drying machine is preferably a
dishwasher 1 comprising anouter casing 10, awash chamber 11, at least onerotary sprayer 5 for distributing wash fluid for washing crockery, as shown by way of example inFigure 8 . - Preferably, said movement device according to the present invention is located in the proximity of an
alternate wash assembly 4 adapted to switch and distribute fluid flows from aninlet 44, connected to a supply circuit, to one or more outlets (43a, 43b), connected to one or more hydraulic circuits. -
Inlet 44 of saidalternate wash assembly 4 is connected to a wash pump, which takes water from awater collecting sump 6, located in the proximity of saidarm 3, thereby creating a closed supply circuit; said one ormore outlets first outlet 43a, which is connected to a hydraulic circuit adapted to supply an upper rotary sprayer (not shown); and asecond outlet 43b, which is connected to a hydraulic circuit adapted to supply lowerrotary sprayer 5. - Essentially, said
alternate wash assembly 4, shown by way of example inFigures 6A, 6B and 6C , comprises achamber 41 in which aselector 42 is arranged. Saidselector 42 is adapted to selectively open and/or close one or more outlets (43a, 43b) depending on which hydraulic circuit must be activated and/or deactivated. - In a preferred embodiment, said
selector 42 is moved by means of saidactuating device 2. - The shape, dimensions and typology of
selector 42 in use may vary depending on design specifications. For the purposes of the present invention, the operation of thealternate wash assembly 4 will not be described in detail herein, since it is known to those skilled in the art. - In an alternative embodiment of
alternate wash assembly 4, shown inFigure 6C ,chamber 41 internally comprises at least one heating means 46, e.g. a resistor, adapted to selectively heat the fluid, e.g. water, that must be directed to the various hydraulic circuits connected toalternate wash assembly 4. The use of heating means 46 allows to eliminate the pressure switch normally included in prior-art dishwashers 1, along with the associated take-off onsump 6 and welding of thesump 6. - Said at least one heating means 46 comprises
safety devices 461, which are connected to acentral control unit 8. Preferably, saidsafety devices 461 are electric/pneumatic and comprise at least onesensor 462 and a switch adapted to determine the temperature and/or the pressure of the fluid and to deactivate said at least one heating means 46 when a preset temperature is reached or if the pressure drops. In fact,temperature sensor 462 is monitored by saidcontrol unit 8, which, when it detects a temperature equal to or higher than a preset maximum temperature, will turn offheating device 46 by opening the electric circuit. - If a pressure drop occurs due to lack of fluid or other faults, such as, for example, a malfunctioning wash pump,
sensor 462 will either open the switch directly or send a signal, e.g. to controlunit 8, for opening the switch and turning off heating means 46. - Preferably, said
control unit 8 will open the switch, thereby opening the circuit ofheating device 46, should any current dispersion occur which might be potentially dangerous for the user ofdishwasher 1. - In addition, as shown in
Figure 7A , saidalternate wash assembly 4 may comprise athird outlet 43c adapted to be connected to a hydraulic circuit comprising a water recovery container (not shown in the drawings) or a drying device. - As aforementioned, said
actuating device 2 comprises anactuator 21, preferably a single motor, and at least onemotion transmission mechanism 22, adapted to transmit motion from said actuator ormotor 21 to said at least onearm 3. Saidmotion transmission mechanism 22 may also be adapted to transmit motion from said actuator ormotor 21 to said at least onealternate wash assembly 4. - Preferably, said
arm 3 is located withinwash chamber 11; instead, said at least oneactuating device 2 is external to thesame wash chamber 11 of saidwashing machine 1 whereto said movement device has been applied. In fact, saidactuating device 2 is preferably arranged underneath the bottom base ofwash chamber 11, thus being protected against the action of water, and particularly not being in direct contact with either the wash water or dirt residues resulting from the various wash steps, so that any corrosion or seizure of themotion transmission mechanisms 22 is prevented. - Said
actuating device 2 is in turn controlled by acentral control unit 8 for the purpose of allowing said at least onearm 3 to be placed into desired positions inside the wash chamber for predetermined time periods. In particular, as shown inFigure 9 ,central control unit 8 is susceptible of being connected to saidmotor 21. - Preferably, said
central control unit 8 is adapted to execute a wash program ofsame dishwasher 1, which specifies the positions and the stop times ofrotary arm 3 withinwash chamber 11. Saidcontrol unit 8 may be connected to amemory unit 81 storing at least one wash program. Saidcontrol unit 8 may possibly comprise saidmemory unit 81. - Preferably, at the beginning of each
wash step arm 3 is always positioned in such a way thatrotary sprayer 5 is in a predetermined sector ofwash chamber 11. At the end of each wash cycle,arm 3 may possibly stop in a predetermined position prior to the beginning of the next wash cycle. -
Central control unit 8 is adapted to activate other devices normally included indishwasher 1 and to monitor a plurality of sensors which are useful for controlling the same dishwasher. Such devices and sensors will not be described in detail herein, since they are known to those skilled in the art. - In the embodiment shown in the annexed drawings,
arm 3 is rotatably supported around a fixed axis, preferably around said second axis "Z", which is located in the proximity of the centre of the base ofwash chamber 11. In particular, saidarm 3 is located in the proximity ofsump 6 comprised inwash chamber 11.Rotary arm 3 has a predetermined revolution speed. In a preferred embodiment, the revolution speed ofarm 3 may be a multiple or submultiple of the revolution speed ofselector 42 of the alternate wash assembly. - In a preferred embodiment, shown in
Figure 3A , saidmotion transmission mechanism 22 comprises ashaft 221b fitted on one end to a joiningelement 30 ofarm 3 and on the opposite end to the shaft ofmotor 21. - Said
motor 21 is an electric motor, e.g. a step motor, as normally used for the devices included in the dishwasher. Preferably, the maximum torque of saidmotor 21 is limited in order to avoid any damage to actuatingdevice 2 which might be due, for example, to an improperly positioned piece of cutlery stopping the rotation of the arm. - In a non-limiting alternative embodiment, as shown by way of example in
Figures 3B , saidmotion transmission mechanism 22 comprises afirst shaft 221a fitted on one end to saidselector 42 of thealternate assembly 4 and on the opposite end to the shaft ofmotor 21; asecond shaft 221b is fitted on one end to a joiningelement 30 ofarm 3 and on the opposite end to apinion 222b, which meshes with acrown wheel 222a mounted to saidfirst shaft 221a. The ratio between saidcrown wheel 222a and saidpinion 222b is such that the revolution speed of thefirst shaft 221a is a multiple of the revolution speed of saidsecond shaft 221b. - In a preferred embodiment, as shown by way of example in
Figure 9 , saidactuating device 2 comprises at least onesensor 24 adapted to detect the position of said at least onearm 3 withinwash chamber 11 of awashing machine 1, and possibly also the position ofselector 42 of the alternate wash assembly. Said at least onesensor 24 is, for example, an encoder, mounted to saidshaft 221b and adapted to determine the direction of rotation ofarm 3 and the absolute position thereof withinwash chamber 11, with a predetermined uncertainty, as a function of the rotation of shaft 221b. Said at least onesensor 24 may be a position sensor of any type, such as, for example, capacitive, resistive, inductive, etc. - Said at least one
sensor 24 is susceptible of being connected to saidcontrol unit 8 for the purpose of determining the position ofarm 3, so thatrotary sprayer 5 can be positioned as required within the wash chamber. In fact, saidsensor 24 allowsrotary sprayer 5 to be positioned in a desired zone ofwash chamber 11 through an appropriate movement ofarm 3.control unit 8, depending on the data received from saidsensor 24, can operatemotor 21 in a manner such as to placerotary sprayer 5 into the desired position by rotating saidarm 3. - Said
arm 3 is connected to the hydraulic circuit intended for lowerrotary sprayer 5. Preferably,arm 3 is mounted through fastening means 62 to saidsecond outlet 43b, which is located in a housing withinsump 6. - In addition to supporting associated
rotary sprayer 5,arm 3 also acts as a duct to supply water torotary sprayer 5, e.g. from thesecond outlet 43b ofalternate assembly 4, to which it is connected. - In particular, said
arm 3 is mounted on, rolling bearings that allowarm 3 to rotate by 360° about said second axis "Z". - As aforementioned,
arm 3 is fitted to saidsecond shaft 221b, but comprises aninternal duct 31 allowing water to flow from thealternate wash assembly 4 torotary sprayer 5. - As shown in the drawings, said
arm 3 is an asymmetric arm, since it comprises acoupling portion 32 in the proximity of one end of saidarm 3, and aperipheral portion 33 at the opposite end of saidarm 3, where only onerotary sprayer 5 is mounted. - Said
coupling portion 32 comprises said joiningelement 30 fitted to saidshaft 221b, so that the second axis of rotation "Z" ofarm 3 corresponds to the axis of rotation of shaft 221b. Said couplingportion 32 also defines a first portion ofduct 31, thereby allowing fluids to flow, for example, from saidalternate wash assembly 4 torotary sprayer 5. Preferably, saidarm 3 is made of plastic material, comprising anupper portion 3a and alower portion 3b that can be removably combined together, as shown inFigures 4A and 5A . - Preferably, said joining
element 30 comprises at least one torque limiting means 23 adapted to disengagearm 3, preferably arranged in saidcoupling portion 32. - In a first embodiment, shown by way of example in
Figures 4A, 4B and 4C ,torque limiting means 23 comprises aselective abutment element 231 appropriately associated with said joiningelement 30, which is adapted to abut against the inner walls ofinternal duct 31 incoupling portion 32; anelastic means 232, e.g. a spring, and atop element 233. - When a predetermined torque value of
shaft 221b is exceeded, depending on the elastic constant ofelastic means 232,selective abutment element 231 will slip onelement 30, thereby preventing motion from being transmitted toarm 3 byshaft 221b. The principle of operation of torque limiting means 23 of the first embodiment is such that, following the release ofarm 3, a new balance point will be reached after a rotation ofshaft 221b by approximately 360°, so that it can rotate about said second axis "Z", driven by saidmotor 21. Thistorque limiting means 23 has one balance point. - In a second embodiment, shown in
Figures 5A, 5B and 5C , joiningelement 30 comprises anabutment portion 234 made of ferrous or ferromagnetic material, which is adapted to abut against amagnetic element 235, so that interference therebetween is generated through magnetic effect, thereby allowing motion to be transmitted toarm 3 byshaft 221b. When a predetermined torque value ofshaft 221b is exceeded, the magnetic force betweenabutment portion 234 andinterference element 235 becomes smaller than the force applied toarm 3, so thatabutment element 234 will move away frommagnetic element 235, thereby preventing motion from being transmitted to saidarm 3. - Following the release of
arm 3,shaft 221b must rotate by approximately 360° in order to engage and drivearm 3 again. This torque limiting means 23, therefore, has only one balance point whenabutment element 234 is in the proximity ofmagnetic element 235, preferably when they face towards each other, so that the magnetic force will tend to hold them abutted against each other. - Preferably, said
rotary sprayer 5 is a symmetric satellite sprayer rotating about said first axis of rotation "R", which is parallel to the second axis of rotation "Z" ofarm 3.Rotary sprayer 5 has preferably a tapered shape, its dimensions, e.g. in the longitudinal direction, being smaller than the standard dimensions used for conventional lower rotary sprayers. In particular, the longitudinal extension ofrotary sprayer 5, which is secured toarm 3 in accordance with the present invention, is at most equal to half the smallest dimension of the base ofwash chamber 11. - In particular, said
rotary sprayer 5 is mounted onto a suitable throughhousing 34 comprised inperipheral portion 33 ofarm 3. Saidhousing 34 is adapted to allowrotary sprayer 5 to rotate freely, as well as to allow the wash fluid to flow towards saidrotary sprayer 5. - The same
rotary sprayer 5 comprises anengagement mouth 52, which is adapted to fit into saidhousing 34 to allow the fluid to flow intorotary sprayer 5 and come out through a plurality ofnozzles 51 in order to hit the crockery arranged in a lower rack positioned insidewash chamber 11 ofdishwasher 1. - Said
nozzles 51 are appropriately arranged on saidrotary sprayer 5, preferably on the upper portion of saidrotary sprayer 5, and have predetermines sizes. Preferably, the sizes of saidnozzles 51 are smaller than the average sizes of the nozzles comprised in the lower rotary sprayers currently available on the market. -
Said engagement mouth 52 comprises removable locking means 53, e.g. interference means, which are adapted to retain saidrotary sprayer 5 in order to prevent it from accidentally detaching from saidarm 3. -
Internal duct 31 ofarm 3, under saidsuitable housing 34, comprises aprotuberance 311 which is appropriately shaped to avoid any fluid flow turbulences induct 31 and to direct the same fluid intorotary sprayer 5. - In an alternative embodiment, shown in
Figure 10 ,arm 3 according to the present invention comprises at least onenozzle 51 to increase the wash power, preferably located inupper portion 3a of thesame arm 3. - In a preferred embodiment, shown in
Figure 7B , the movement device according to the present invention can be applied to a vapor circuit or to a hydraulic circuit for water at a higher temperature than the fluid coming fromalternate wash assembly 4. In particular,internal duct 31 ofarm 3 can be used for conducting water vapor towards the samerotary sprayer 5 when the latter is positioned under the crockery, for improving the washing or drying action. - The use of an asymmetric arm and a smaller rotary sprayer makes available more room in
wash tub 11. - The use of a smaller
rotary sprayer 5, which can be moved to different sections over the base ofwash chamber 11, allows, as aforementioned, to reduce the dimensions ofsprayer nozzles 51. - Comparing the dimensions of
rotary sprayer 5 with those of the lower rotary sprayers commonly used in prior-art dishwashers, the longitudinal extension ofrotary sprayer 5 according to the present invention is half the longitudinal extension of current lower rotary sprayers. - The movement of
arm 3 about said second vertical axis "Z" and the small dimensions ofrotary sprayer 5 allow to wash a portion of the rack, e.g. only one fourth of the rack, thus reducing the water consumption, also because of the smaller number ofnozzles 51. By way of example, for awash chamber 11 having a 50cm side, the longitudinal dimension ofarm 3 is smaller than 12.5 cm, while the rotary sprayer has a longitudinal extension of less than 25 cm. The number ofnozzles 51 of lowerrotary sprayer 5 is halved. - The possibility of moving
arm 3, and hence of placing the rotary sprayer into desired positions for washing a particular sector oflower rack 12, improves the washing of the crockery arranged inrack 12 because the crockery is better sprinkled with wash fluid. - Furthermore, the controlled movement of
arm 3 allowsarm 3 to be positioned in a manner such that the fluid jets fromnozzles 51 ofarm 3 and/or ofrotary sprayer 5 are at least partly directed towards adetergent dispenser 14 comprised indishwasher 1, into which the user has previously poured a predetermined quantity of detergent. The possibility of intentionally directing the fluid jets towards said detergent dispenser allows dissolving the detergent into the fluid as a function of the wash step to be carried out. - The dimensions of
rotary sprayer 5 and the rotation ofarm 3 about said second vertical axis "Z" allow to improve the washing in the central zone ofwash chamber 11 ofdishwasher 1, by improving the trajectories of the fluid jets coming from the rotary sprayer. - Furthermore, the smaller number of
nozzles 51 and the possibility of changing the position ofrotary sprayer 5 withinwash chamber 11 ensure a lower consumption of liquid, in particular water, used for washing the crockery. The smaller quantity of wash water required allows to reduce the capacity of the wash pump and the power of the associated motor, resulting in lower production costs. Positioning the rotary sprayer into particular sectors ofwash chamber 11 allows to improve the wash performance, in that it is possible to change the stop times ofrotary sprayer 5 in the various positions depending on the wash program in execution. - The movement device according to the present invention allows to position the rotary sprayer in the desired zones of
wash chamber 11 through the use of a simple actuating device. Furthermore, the movement device is safe and immune from malfunctions or damage typically suffered by prior-art devices, becausemotion transmission mechanism 22 is insulated and cannot be corroded by wash fluids, nor can it be subject to dirt accumulation, which might damage the mechanism itself. -
- 1
- Dishwasher
- 10
- Outer casing
- 11
- Wash chamber
- 12
- Rack
- 14
- Detergent dispenser
- 2
- Actuating device
- 21
- Motor
- 22
- Motion transmission mechanism
- 221a/b
- First and second shafts
- 222a
- Crown wheel
- 222b
- Pinion
- 23
- Torque limiting means
- 231
- Selective abutment element
- 232
- Elastic element
- 233
- Top element
- 234
- Abutment portion
- 235
- Magnetic element
- 24
- Sensor
- 3
- Arm
- 3a/b
- Upper and lower portions
- 30
- Joining element
- 31
- Internal duct
- 311
- Protuberance
- 32
- Coupling portion
- 33
- Peripheral portion
- 34
- Housing
- 4
- Alternate wash assembly
- 41
- Chamber
- 42
- Selector
- 43a/b
- First and second outlets
- 43c
- Third outlet
- 44
- Inlet
- 46
- Heating means
- 461
- Safety device
- 462
- Temperature sensor
- 5
- Rotary sprayer
- 51
- Nozzles
- 52
- Engagement mouth
- 53
- Locking means
- 6
- Sump
- 62
- Fastening means
- 8
- Central control unit
- 81
- Memory unit
- "Z"
- Second axis - arm rotation
- "R"
- First axis - sprayer rotation.
Claims (11)
- Device for moving at least one rotary sprayer (5) for washing or drying appliances, which is adapted to rotate about a first axis (R);
said movement device comprises:• an arm (3) enabled to rotate about a second axis (Z), on which said rotary sprayer (5) is rotatably mounted;• at least one actuating device (2), for rotating said arm (3) about said second axis (Z),• said arm:- is adapted to rotate by 360°- is asymmetric, and- comprises only one rotary sprayer (5) mounted in the proximity of a peripheral portion of the same arm (3);• said actuating device (2), connected in the proximity of a coupling portion (32) of the arm (3), selectively rotates the same arm (3),for the purpose of positioning said rotary sprayer (5) at desired angles of rotation of the arm (3) about said second axis (Z);
said actuating device (2) comprises:• a motor (21), and• at least one motion transmission mechanism (22) for transmitting motion from said motor (21) to said at least one arm (3);said actuating device (2) is connected to the coupling portion (32) of the arm (3);
characterized in that said motion transmission mechanism (22) comprises a shaft (221b) fitted on one end to the coupling portion (32) of the arm (3) and on the opposite end to the shaft of the motor (21). - Device according to claim 1, wherein said arm (3) is located within a wash chamber (11); said at least one actuating device (2) is external to the same wash chamber (11) comprised in a washing machine (1) whereto the movement device has been applied.
- Device according to claim 1, wherein said actuating device comprises at least one sensor (24) adapted to determine the direction of rotation of arm (3) and the absolute position of said at least one arm (3) within the wash chamber (11) of a washing machine (1) whereto said device has been applied, allowing the rotary sprayer (5) to be positioned in a desired zone of the wash chamber (11) through an appropriate rotation of the arm (3).
- Device according to claim 1 or 3, wherein said actuating device (2) is in its turn controlled by a central control unit (8) for the purpose of allowing said at least one arm (3) to be placed into desired positions inside the wash chamber for predetermined time periods.
- Device according to one of the preceding claims, wherein said coupling portion (32) of the arm (3) defines a first portion of the duct (31), thereby allowing the fluids to flow towards the rotary sprayer (5).
- Device according to claim 1, wherein said at least one motion transmission mechanism (22) comprises torque limiting means (23) adapted to disengage the arm (3).
- Dishwasher (1) comprising an outer casing (10), a wash chamber (11), at least one rotary sprayer (5) for distributing wash fluid for washing crockery; characterized in that it comprises at least one movement device according to claim 1.
- Dishwasher according to claim 7, wherein the arm (3) is rotatably supported around a fixed axis located in the proximity of the centre of the base of the wash chamber (11).
- Dishwasher according to claim 7, which comprises a central control unit (8) for executing a wash program of the same dishwasher (1) that specifies the positions and stop times of the rotary arm (2) inside the wash chamber (11).
- Dishwasher according to claim 7 or 9, wherein at the end of the cycle the arm (3) is located in a predetermined position.
- Dishwasher according to claim 8, wherein the arm (3) can be positioned in a manner such that the fluid jets from a plurality of nozzles (51) of the arm (3) and/or of the rotary sprayer (5) are at least partly directed towards a detergent dispenser (14) comprised in the dishwasher (1).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000200A ITTO20120200A1 (en) | 2012-03-08 | 2012-03-08 | DEVICE FOR HANDLING WASHING IMPELLERS FOR WASHING AND DRYING DEVICES. |
PCT/IB2013/051816 WO2013132459A1 (en) | 2012-03-08 | 2013-03-07 | Device for moving washing impellers for washing and/or drying devices |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2822441A1 EP2822441A1 (en) | 2015-01-14 |
EP2822441B1 true EP2822441B1 (en) | 2016-05-04 |
Family
ID=46001502
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13720566.2A Active EP2822441B1 (en) | 2012-03-08 | 2013-03-07 | Device for moving washing impellers for washing and/or drying devices |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2822441B1 (en) |
CN (1) | CN104271024B (en) |
ES (1) | ES2587941T3 (en) |
IT (1) | ITTO20120200A1 (en) |
PL (1) | PL2822441T3 (en) |
WO (1) | WO2013132459A1 (en) |
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WO2022157063A1 (en) * | 2021-01-25 | 2022-07-28 | BSH Hausgeräte GmbH | Domestic dishwasher |
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IT248022Y1 (en) * | 1999-05-03 | 2002-12-09 | Electrolux Zanussi Elettrodome | DISHWASHER WITH EPICYCLOIDAL SPRAY REEL |
IT1313319B1 (en) * | 1999-10-01 | 2002-07-17 | Smeg Spa | REVOLVING SPRAYER FOR DISHWASHER EQUIPPED WITH DEVICE FOR HORIZONTAL MOVEMENT. |
IT1317138B1 (en) * | 2000-03-08 | 2003-05-27 | Bonferraro Spa | REVOLVING DISHWASHER UNIT FOR DISHWASHER EQUIPPED WITH HORIZONTAL MOVEMENT DEVICE |
DE102009007297A1 (en) * | 2009-02-03 | 2010-08-12 | Miele & Cie. Kg | Dish washer, has arms whose end engages position at which perpendicular distance between ends of arms and rotatable axle of other arm is larger than reduced distance between walls and another rotatable axle in rotation plane of former arms |
US8192551B2 (en) * | 2009-02-20 | 2012-06-05 | Whirlpool Corporation | Obstacle sensing spray arm for a dishwashing machine |
US8240321B2 (en) * | 2009-12-18 | 2012-08-14 | Whirlpool Corporation | Magnetic drive controlled rotation for dishwasher spray arm |
US8578954B2 (en) * | 2009-12-21 | 2013-11-12 | Whirlpool Corporation | Spray arm assembly for a dishwasher |
-
2012
- 2012-03-08 IT IT000200A patent/ITTO20120200A1/en unknown
-
2013
- 2013-03-07 WO PCT/IB2013/051816 patent/WO2013132459A1/en active Application Filing
- 2013-03-07 CN CN201380019221.7A patent/CN104271024B/en not_active Expired - Fee Related
- 2013-03-07 EP EP13720566.2A patent/EP2822441B1/en active Active
- 2013-03-07 PL PL13720566.2T patent/PL2822441T3/en unknown
- 2013-03-07 ES ES13720566.2T patent/ES2587941T3/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022157063A1 (en) * | 2021-01-25 | 2022-07-28 | BSH Hausgeräte GmbH | Domestic dishwasher |
Also Published As
Publication number | Publication date |
---|---|
CN104271024B (en) | 2018-01-30 |
ES2587941T3 (en) | 2016-10-27 |
PL2822441T3 (en) | 2016-11-30 |
ITTO20120200A1 (en) | 2013-09-09 |
CN104271024A (en) | 2015-01-07 |
WO2013132459A1 (en) | 2013-09-12 |
EP2822441A1 (en) | 2015-01-14 |
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