EP2062519B1 - Dishwasher with anti-flood safety system - Google Patents

Dishwasher with anti-flood safety system Download PDF

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Publication number
EP2062519B1
EP2062519B1 EP08425734.4A EP08425734A EP2062519B1 EP 2062519 B1 EP2062519 B1 EP 2062519B1 EP 08425734 A EP08425734 A EP 08425734A EP 2062519 B1 EP2062519 B1 EP 2062519B1
Authority
EP
European Patent Office
Prior art keywords
dishwasher
water
container
radiation
sensor device
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.)
Not-in-force
Application number
EP08425734.4A
Other languages
German (de)
French (fr)
Other versions
EP2062519A1 (en
Inventor
Enzo Brignone
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.)
Bitron SpA
Original Assignee
Bitron SpA
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Filing date
Publication date
Application filed by Bitron SpA filed Critical Bitron SpA
Priority to PL08425734T priority Critical patent/PL2062519T3/en
Publication of EP2062519A1 publication Critical patent/EP2062519A1/en
Application granted granted Critical
Publication of EP2062519B1 publication Critical patent/EP2062519B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • A47L15/421—Safety arrangements for preventing water damage

Definitions

  • the present invention relates to a dishwasher provided with an anti-flood safety system.
  • such a safety system comprises a container for collecting escaped water, in which there is fitted a floating member which can operate a switch when the water accumulating in the container reaches a predetermined level.
  • the switch activates a pump, either directly or indirectly by means of a timer card, to discharge the water contained in the wash chamber.
  • DE-A-32 41 460 discloses a dishwasher provided with an anti-flood safety system comprising:
  • DE-A-199 45 925 discloses a domestic appliance provided of an optical safety system with an emitter of optical rays and an optical receiver thereof.
  • the object of the present invention is therefore to overcome the drawbacks of the known art.
  • the signal generated by the sensor device may be, for example, an acoustic and/or optical alarm signal, or a signal which is used, either directly or indirectly by means of a PCB (printed circuit board) which is typically present in a dishwasher, to cause the activation of a pump in order to discharge the water contained in the wash chamber.
  • a PCB printed circuit board
  • the use of a sensor device based on the emission and reception of radiation provides a satisfactory accuracy of operation, which is markedly greater than that offered by a mechanical system.
  • a dishwasher is provided with an anti-flood safety system comprising ( Fig. 1 ) a container 10, located on the base of the dishwasher, for collecting escaped water, and a sensor device which can detect a predetermined threshold level reached by the water in the container 10 and which can send a signal when this level is reached.
  • the sensor device includes a radiation emitter 12 and an associated radiation receiver 14, which are incorporated in a single supporting casing 16 located above the inner cavity of a dihedral formation 18 having a first wing 20 and a second wing 22, which meet at a vertex 24 pointing towards the base of the chamber 10.
  • the emitter 12 can be a light-emitting diode and the receiver 14 can be a phototransistor.
  • the dihedral formation 18 is an appendage of a water decalcifying device 26 of a conventional type, which is provided in the dishwasher for softening the water supplied thereto.
  • the arrangement of the various components of the sensor device is such that the radiation emitted by the emitter 12 undergoes an initial reflection from the first wing 20 and another reflection from the second wing 22, being finally reflected towards the receiver 14 (see the path shown in broken lines and identified by the reference numeral 28).
  • the extent of these reflections is affected by the presence or absence of escaped water in the container 10 between the wings 20 and 22 of the dihedral formation 18. Consequently, as soon as a significant quantity, corresponding to a predetermined threshold level, has accumulated in this area, the sensor device sends a signal which is used to cause the activation of a discharge pump (not shown in Figure 1 ), either directly or indirectly.
  • This safety system has a very high accuracy of operation and is also economical, since it does not require moving parts such as a floating member, and can easily be incorporated in a conventional decalcifying device or, if necessary, in the well of the dishwasher.
  • FIGS 2 and 3 show an embodiment, in which numbers identical to those used in the preceding figure indicate identical or equivalent parts.
  • the anti-flood safety system comprises a floating member 30 located in the collecting container 10.
  • the member 30 has a disc-like body, with a bar 32 projecting vertically upwards from the central part of this body.
  • the water level sensor device includes a radiation emitter 12 and an associated radiation receiver 14, which are electrically connected to a PCB 34 on opposite sides of the bar 32.
  • the PCB 34 is also electrically connected to another radiation emitter 36 and another radiation receiver 38 forming part of a device for sensing the level of salt in a corresponding reservoir 40 of the decalcifying device 26, of the type usually provided in conventional dishwashers.
  • the reservoir 40 is provided with a plug 42 and has an insulated compartment 44 in which is located an LED device 46 which is also electrically connected to the PCB 34.
  • the emitters 12 and 36 can be light-emitting diodes, for example, while the receivers 14 and 38 can be phototransistors.
  • the accumulation of water in the container 10 due to a possible escape causes the floating member 30 to rise with its associated bar 32, which, when a predetermined threshold level is reached, intercepts the path of the radiation from the emitter 12 to the receiver 14.
  • the sensor device consequently sends a signal which is used to cause the activation of a discharge pump, either directly or indirectly.
  • the operating principle of the device for sensing the salt level in the reservoir 40 is substantially similar.
  • the presence or absence of salt between the emitter 36 and the receiver 38 affects the amount of radiation received by the latter, in such a way that a signal is sent when the level of salt falls below a predetermined level.
  • This signal can be used, in particular, to switch on the LED device 46 and illuminate the plug 42 of the reservoir 40, in order to attract the user's attention when the door of the dishwasher is opened at the end of a wash cycle.
  • the LED device 46 can also serve to monitor the correct operation of a rotor (not shown in the drawings) which rotates within the wash chamber above the plug 42.
  • the safety system of this second embodiment requires the presence of the floating member 30, although the rising movement of this member which causes the signal to be sent is not opposed by any external element. This avoids the inaccuracies of the known devices, in which the floating member has to overcome the resistance of a mechanical opposing member, which can vary over a rather wide tolerance range.
  • the PCB 34 which is already present in the dishwasher, and which is also used for other functions such as the monitoring of the salt level in the corresponding reservoir 40, is used as the electronic part of the sensor device of this additional safety system according to the invention. It is therefore still possible to simplify the structure and reduce the costs.
  • FIGS 4 and 5 show another embodiment of the invention, in which numbers identical to those used in the preceding figure 1 indicate identical or equivalent parts.
  • the dihedral formation is not an appendage of the water decalcifying device 26, but is the base portion of a freestanding component 44 which is inserted into the housing which is typically occupied by the floating member in a conventional device.
  • the component 44 takes the form of a hollow stem with a flange 46 projecting radially from its upper end, and acts as a stop to prevent downward sliding before the device 26 has been fitted in the dishwasher. It should be noted that, when the device 26 with the component 44 has been fitted in the dishwasher, the vertex 24 of the dihedral formation 18 is in contact with the base of the container 10 for collecting the escaped water.
  • the operating principle and the structure of the sensor device including an emitter 12 and a receiver 14 are not different from those described previously with reference to Figure 1 .
  • the embodiment shown in Figures 4 and 5 has the advantage of making it possible to take up any slack which may develop in the assembly of the dishwasher between the decalcifying device 26 and the container 10 which is fixed to the base.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Jib Cranes (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Description

  • The present invention relates to a dishwasher provided with an anti-flood safety system.
  • According to a known art, such a safety system comprises a container for collecting escaped water, in which there is fitted a floating member which can operate a switch when the water accumulating in the container reaches a predetermined level. In its turn, the switch activates a pump, either directly or indirectly by means of a timer card, to discharge the water contained in the wash chamber.
  • In more detail, DE-A-32 41 460 discloses a dishwasher provided with an anti-flood safety system comprising:
    • a floating member which is located within a chamber for collecting escaped water and which has a bar protruding from it, and
    • a sensor device for detecting a predetermined threshold level reached by the water in said chamber and for sending a signal when said level is reached.
  • However, this known system cannot provide completely satisfactory accuracy in operation, since the force that must be exerted by the floating member to trigger the switch may vary over a rather wide tolerance range. Furthermore, a system of this kind is rather bulky and expensive.
  • On the other hand, DE-A-199 45 925 discloses a domestic appliance provided of an optical safety system with an emitter of optical rays and an optical receiver thereof.
  • The object of the present invention is therefore to overcome the drawbacks of the known art.
  • According to the invention, this object is achieved by means of a dishwasher having the features disclosed in claim 1 which follows.
  • The signal generated by the sensor device may be, for example, an acoustic and/or optical alarm signal, or a signal which is used, either directly or indirectly by means of a PCB (printed circuit board) which is typically present in a dishwasher, to cause the activation of a pump in order to discharge the water contained in the wash chamber.
  • According to the invention, the use of a sensor device based on the emission and reception of radiation provides a satisfactory accuracy of operation, which is markedly greater than that offered by a mechanical system.
  • Further advantages and characteristics of the present invention will be made clear by the following detailed description, which refers to the attached drawings provided by way of non-limiting example, in which:
    • Figure 1 is a schematic perspective representation of the components of a safety system of a dishwasher according to the invention,
    • Figure 2 is a cut-away perspective representation of a safety system of a dishwasher not according to the invention,
    • Figure 3 is a cut-away perspective representation, taken from a different angle, of the safety system of the dishwasher of Figure 2,
    • Figure 4 is a schematic perspective representation of a safety system of a dishwasher according to another embodiment of the invention, and
    • Figure 5 shows an enlarged view of part of what is illustrated in Figure 4.
  • A dishwasher is provided with an anti-flood safety system comprising (Fig. 1) a container 10, located on the base of the dishwasher, for collecting escaped water, and a sensor device which can detect a predetermined threshold level reached by the water in the container 10 and which can send a signal when this level is reached.
  • The sensor device, of a known type, includes a radiation emitter 12 and an associated radiation receiver 14, which are incorporated in a single supporting casing 16 located above the inner cavity of a dihedral formation 18 having a first wing 20 and a second wing 22, which meet at a vertex 24 pointing towards the base of the chamber 10. For example, the emitter 12 can be a light-emitting diode and the receiver 14 can be a phototransistor. The dihedral formation 18 is an appendage of a water decalcifying device 26 of a conventional type, which is provided in the dishwasher for softening the water supplied thereto.
  • The arrangement of the various components of the sensor device is such that the radiation emitted by the emitter 12 undergoes an initial reflection from the first wing 20 and another reflection from the second wing 22, being finally reflected towards the receiver 14 (see the path shown in broken lines and identified by the reference numeral 28). The extent of these reflections is affected by the presence or absence of escaped water in the container 10 between the wings 20 and 22 of the dihedral formation 18. Consequently, as soon as a significant quantity, corresponding to a predetermined threshold level, has accumulated in this area, the sensor device sends a signal which is used to cause the activation of a discharge pump (not shown in Figure 1), either directly or indirectly. This safety system has a very high accuracy of operation and is also economical, since it does not require moving parts such as a floating member, and can easily be incorporated in a conventional decalcifying device or, if necessary, in the well of the dishwasher.
  • Figures 2 and 3 show an embodiment, in which numbers identical to those used in the preceding figure indicate identical or equivalent parts.
  • In this case, the anti-flood safety system comprises a floating member 30 located in the collecting container 10. The member 30 has a disc-like body, with a bar 32 projecting vertically upwards from the central part of this body. The water level sensor device includes a radiation emitter 12 and an associated radiation receiver 14, which are electrically connected to a PCB 34 on opposite sides of the bar 32. The PCB 34 is also electrically connected to another radiation emitter 36 and another radiation receiver 38 forming part of a device for sensing the level of salt in a corresponding reservoir 40 of the decalcifying device 26, of the type usually provided in conventional dishwashers. The reservoir 40 is provided with a plug 42 and has an insulated compartment 44 in which is located an LED device 46 which is also electrically connected to the PCB 34. The emitters 12 and 36 can be light-emitting diodes, for example, while the receivers 14 and 38 can be phototransistors.
  • The accumulation of water in the container 10 due to a possible escape causes the floating member 30 to rise with its associated bar 32, which, when a predetermined threshold level is reached, intercepts the path of the radiation from the emitter 12 to the receiver 14. The sensor device consequently sends a signal which is used to cause the activation of a discharge pump, either directly or indirectly.
  • The operating principle of the device for sensing the salt level in the reservoir 40 is substantially similar. In this case also, the presence or absence of salt between the emitter 36 and the receiver 38 affects the amount of radiation received by the latter, in such a way that a signal is sent when the level of salt falls below a predetermined level. This signal can be used, in particular, to switch on the LED device 46 and illuminate the plug 42 of the reservoir 40, in order to attract the user's attention when the door of the dishwasher is opened at the end of a wash cycle.
  • During the operation of the dishwasher, the LED device 46 can also serve to monitor the correct operation of a rotor (not shown in the drawings) which rotates within the wash chamber above the plug 42.
  • As mentioned, the safety system of this second embodiment requires the presence of the floating member 30, although the rising movement of this member which causes the signal to be sent is not opposed by any external element. This avoids the inaccuracies of the known devices, in which the floating member has to overcome the resistance of a mechanical opposing member, which can vary over a rather wide tolerance range. Furthermore, the PCB 34, which is already present in the dishwasher, and which is also used for other functions such as the monitoring of the salt level in the corresponding reservoir 40, is used as the electronic part of the sensor device of this additional safety system according to the invention. It is therefore still possible to simplify the structure and reduce the costs.
  • Figures 4 and 5 show another embodiment of the invention, in which numbers identical to those used in the preceding figure 1 indicate identical or equivalent parts.
  • In this case, the dihedral formation is not an appendage of the water decalcifying device 26, but is the base portion of a freestanding component 44 which is inserted into the housing which is typically occupied by the floating member in a conventional device. The component 44 takes the form of a hollow stem with a flange 46 projecting radially from its upper end, and acts as a stop to prevent downward sliding before the device 26 has been fitted in the dishwasher. It should be noted that, when the device 26 with the component 44 has been fitted in the dishwasher, the vertex 24 of the dihedral formation 18 is in contact with the base of the container 10 for collecting the escaped water.
  • The operating principle and the structure of the sensor device including an emitter 12 and a receiver 14 are not different from those described previously with reference to Figure 1.
  • The embodiment shown in Figures 4 and 5 has the advantage of making it possible to take up any slack which may develop in the assembly of the dishwasher between the decalcifying device 26 and the container 10 which is fixed to the base.
  • Clearly, provided that the principle of the invention is retained, the details of construction and the forms of embodiment can be varied widely from what has been described purely by way of example, without departure from the scope which has been claimed.

Claims (5)

  1. Dishwasher provided with an anti-flood safety system comprising:
    - a container (10) for collecting escaped water located on the base of the dishwasher, and
    - a sensor device for detecting a predetermined threshold level reached by the water in said container (10), and for sending a signal when said level is reached,
    said dishwasher being characterized in that said sensor device includes a radiation emitter (12) and an associated radiation receiver (14), and is of the static type, not comprising any moving parts, wherein said radiation emitter (12) and radiation receiver (14) are incorporated in a single supporting casing (16) located above the inner cavity of a dihedral formation (18) having a first wing (20) and a second wing (22) which meet at a vertex (24) pointing towards the base of said container (10), wherein the radiation emitted by the emitter (12) undergoes an initial reflection from the first wing (20) and another reflection from the second wing (22), being finally reflected towards the receiver (14), the extent of these reflections being affected by the presence or absence of escaped water in the container (10) between said wings (20, 22), so that, as soon as a quantity of water corresponding to the predetermined threshold level has accumulated, the signal is sent by the sensor device and used by a printed circuit board, which is used also for other functions of the dishwasher, to cause the activation of a pump in order to discharge the water contained in a wash chamber.
  2. Dishwasher according to Claim 1, in which said dihedral formation (18) is an appendage of a water decalcifying device (26).
  3. Dishwasher according to Claim 1 or 2, in which said radiation emitter (12) and radiation receiver (14) forming part of the sensor device of the anti-flood safety system are, respectively, a light-emitting diode and a phototransistor.
  4. Dishwasher according to Claim 1, in which said dihedral formation (18) is the base portion of a component (44) in the shape of a hollow stem.
  5. Dishwasher according to Claim 4, in which the vertex (24) of said dihedral formation (18) is in contact with the base of the container (10).
EP08425734.4A 2007-11-23 2008-11-19 Dishwasher with anti-flood safety system Not-in-force EP2062519B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08425734T PL2062519T3 (en) 2007-11-23 2008-11-19 Dishwasher with anti-flood safety system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO20070842 ITTO20070842A1 (en) 2007-11-23 2007-11-23 DISHWASHER MACHINE WITH ANTI-FLOOD SAFETY SYSTEM

Publications (2)

Publication Number Publication Date
EP2062519A1 EP2062519A1 (en) 2009-05-27
EP2062519B1 true EP2062519B1 (en) 2018-09-12

Family

ID=40315029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08425734.4A Not-in-force EP2062519B1 (en) 2007-11-23 2008-11-19 Dishwasher with anti-flood safety system

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EP (1) EP2062519B1 (en)
KR (1) KR101582784B1 (en)
CN (1) CN101438951A (en)
IT (1) ITTO20070842A1 (en)
PL (1) PL2062519T3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20130598A1 (en) * 2013-07-16 2015-01-17 Bitron Spa LOADING AND / OR SAFETY DEVICE FOR ANTI-LINING FOR A WASHING MACHINE.
IT201700001017A1 (en) * 2017-01-09 2018-07-09 Manuela Brignone Washing machine with electronic anti-flooding security
EP4275576A3 (en) * 2017-09-20 2024-01-10 Foshan Shunde Midea Washing Appliances Manufacturing Co., Ltd. Dishwasher and base assembly

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
DE2949238A1 (en) * 1979-12-07 1981-06-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Photoelectric burst-detector for washing appliance hoses - using optical pulses transmitted along optical filaments in hose-wall
DE3241460A1 (en) 1982-11-10 1984-05-10 Werner 7400 Tübingen Bopp Device for detecting escaping leaking water on floors or other standing areas
KR940007405Y1 (en) * 1992-07-08 1994-10-20 유재욱 Washing or rinsing machines for tableware water supply control apparatus
KR940007097Y1 (en) * 1992-09-26 1994-10-13 이영서 Leakage sensor for tableware washing machine
KR0123374B1 (en) * 1995-11-23 1997-11-27 이영서 Dishwasher
GB2354098A (en) * 1999-09-07 2001-03-14 Carlton Ashley Rae Overflow or leak detector arrangement for domestic appliance
DE19945925A1 (en) 1999-09-24 2001-03-29 Bsh Bosch Siemens Hausgeraete Water-bearing household appliance
DE10206277C1 (en) * 2002-02-15 2003-10-16 Miele & Cie Program-controlled dishwasher with an overflow protection
CN1506316A (en) * 2002-12-10 2004-06-23 李新生 Cabinet type domestic waste water cyclic treatment and utilization machine
CN1552635A (en) * 2003-06-07 2004-12-08 乐金电子(天津)电器有限公司 Water softing apparatus of bowl washer

Non-Patent Citations (1)

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Title
None *

Also Published As

Publication number Publication date
CN101438951A (en) 2009-05-27
PL2062519T3 (en) 2019-03-29
ITTO20070842A1 (en) 2009-05-24
EP2062519A1 (en) 2009-05-27
KR101582784B1 (en) 2016-01-19
KR20090053744A (en) 2009-05-27

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