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EP2175766B1 - A dishwasher - Google Patents

A dishwasher Download PDF

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Publication number
EP2175766B1
EP2175766B1 EP08774611A EP08774611A EP2175766B1 EP 2175766 B1 EP2175766 B1 EP 2175766B1 EP 08774611 A EP08774611 A EP 08774611A EP 08774611 A EP08774611 A EP 08774611A EP 2175766 B1 EP2175766 B1 EP 2175766B1
Authority
EP
European Patent Office
Prior art keywords
dishwasher
turbidity
water
pump motor
speed
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.)
Active
Application number
EP08774611A
Other languages
German (de)
French (fr)
Other versions
EP2175766A1 (en
Inventor
Songul Bayraktar
Bulent Kucukcoskun
Ebru Cetinkaya
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.)
Arcelik AS
Original Assignee
Arcelik AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arcelik AS filed Critical Arcelik AS
Priority to PL08774611T priority Critical patent/PL2175766T3/en
Publication of EP2175766A1 publication Critical patent/EP2175766A1/en
Application granted granted Critical
Publication of EP2175766B1 publication Critical patent/EP2175766B1/en
Active legal-status Critical Current
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4297—Arrangements for detecting or measuring the condition of the washing water, e.g. turbidity
    • 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
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0049—Detection or prevention of malfunction, including accident prevention

Definitions

  • the present invention relates to dishwashers comprising a turbidity sensor.
  • a washing program is implemented that is comprised of various steps such as pre-washing, main washing and rinsing.
  • turbidity sensors are used for detecting the dirt of the dishes placed in the machine or whether the dishes are properly cleaned after washing.
  • these turbidity sensors used are affected by factors such as intake of water into the washing chamber and the rotational speed of the spray arms and as a result the measurement cannot be performed accurately.
  • the aim of the present invention is the realization of a dishwasher wherein the program and program parameter selection based on turbidity detection is made with high accuracy.
  • a turbidity sensor is used for measuring the turbidity of water in order to detect the dirt amount of the dishes for determining the washing program steps and the parameters such as water temperature, duration etc. relating to these steps.
  • the turbidity sensor performs all the measurement activities while the working conditions of the spray arms are at a constant value predetermined by the producer.
  • the turbidity sensor takes measurements only while the upper spray arm is rotating. Accordingly, measurement is taken while water is sprayed into the washing chamber with a lower pressure thereby minimizing the deviation in the measurement.
  • the turbidity measurements are taken while both of the spray arms are rotating.
  • measurements are made with identical deviations without disrupting the normal working process by taking the measurement in a frequent condition of the dishwasher during washing.
  • the turbidity is measured while the speed of the pump motor actuating the spray arms is at value predetermined by the producer.
  • the speed of the pump motor predetermined by the producer for taking measurements is not a speed at which the pump motor operates normally during the program steps of the dishwasher. For example, while the pump motor is operated at 2500-3000 rpm speed, the speed of the pump motor is reduced to 1500 rpm and measurement is performed when the turbulence that will cause deviation in the sprayed water is lower.
  • Figure 1 - is the schematic view of a dishwasher.
  • the dishwasher (1) provides cleaning of the dishes in accordance with a washing program that includes at least some of the various steps like pre-washing, main washing, rinsing, drying, regeneration.
  • the dishwasher (1) comprises a washing chamber (2) wherein the dishes to be washed are emplaced, at least one spray arm (4, 104) that sprays water on the dishes while rotating around its axis, at least one pump motor (3) for the water to be circulated and to be sprayed from the spray arms (4, 104), at least one turbidity sensor (5) that performs the wash water turbidity measurements in order to detect the dirtiness of the dishes only while the speed (w) of the pump motor (3) is at a constant value predetermined by the producer and/or while water is directed to always the same spray arm/spray arms (4, 104) ( Figure 1 ).
  • two spray arms (4, 104), an upper (4) one and a lower (104) one, are used.
  • the turbidity sensor (5) takes measurements only while the upper spray arm (4) is rotating.
  • the turbidity sensor (5) takes measurements while both of the spray arms (4, 104) are rotating.
  • a variable speed, brushless direct current pump motor (3) is used.
  • the turbidity sensor (5) takes measurements while the speed (w) of the pump motor (3) is at a value (w m ) predetermined by the producer.
  • the speed (w m ) of the pump motor (3) predetermined by the producer for taking measurements is a speed not normally used by the pump motor (3) during the program steps of the dishwasher (1).
  • the speed of the pump motor (3) is reduced to 1500 rpm and turbidity measurement is performed at this speed.
  • the deviation in the measurement of the turbidity sensor (5) caused by the turbulence generated due to the speed and direction of water intake into the washing chamber (2) or the motion of the spray arms (4, 104) during the washing steps is maintained to be constant thereby increasing the accuracy in selections of program and program parameters performed in accordance with the data received from the turbidity sensor (5).

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Table Devices Or Equipment (AREA)
  • Lubricants (AREA)
  • Harvesting Machines For Specific Crops (AREA)

Abstract

The present invention relates to a dishwasher (1) wherein the deviation created in the turbidity sensor (5) measurement caused by the turbulence generated due to the water direction and intake speed into the washing chamber (2) or the motion of the spray arms (4, 104) during the washing steps is maintained to be constant and thereby the program and program parameter selections can be made with a high precision.

Description

  • The present invention relates to dishwashers comprising a turbidity sensor.
  • In a dishwasher, a washing program is implemented that is comprised of various steps such as pre-washing, main washing and rinsing. In these machines, particularly in the machines that select the washing program to be used, turbidity sensors are used for detecting the dirt of the dishes placed in the machine or whether the dishes are properly cleaned after washing. However, these turbidity sensors used are affected by factors such as intake of water into the washing chamber and the rotational speed of the spray arms and as a result the measurement cannot be performed accurately.
  • Various methods are used in the technique for measuring turbidity with a high precision.
  • One of these methods is explained in state of the art Chinese Patent Application No CN1682641 . In this method, after water is taken into the machine before starting washing, an initial turbidity measurement is made and the pre-wash is performed according to this measurement. Afterwards, a large number of measurements are made during pre-wash and other program steps whereby the average of these is calculated and the duration of program steps and the other parameters are determined by taking into consideration the initial dirt measurement and the said average value.
  • In another implementation known in the technique, the Japanese Patent Application No JP2006081629 , the explanation is given for a dishwasher wherein a certain time period passes for the water to settle down after water intake process ends, and afterwards a turbidity measurement is made.
  • Another implementation known in the technique is explained in the European Patent Application No EP1238623 . In the dishwasher explained in this application, several calibration value measurements at each program step at respective times are made for the calibration of the turbidity sensor and the measured values are revised according to the calibration measurement for determining the real turbidity value. Further relevant prior art is known from US-A-2006/021637 .
  • The aim of the present invention is the realization of a dishwasher wherein the program and program parameter selection based on turbidity detection is made with high accuracy.
  • The dishwasher realized in order to attain the aim of the present invention is defined in the attached claims.
  • In the dishwasher of the present invention, a turbidity sensor is used for measuring the turbidity of water in order to detect the dirt amount of the dishes for determining the washing program steps and the parameters such as water temperature, duration etc. relating to these steps. The turbidity sensor performs all the measurement activities while the working conditions of the spray arms are at a constant value predetermined by the producer. Thus, the deviation in the measurement of the turbidity sensor created by the turbulence due to the water intake into the washing chamber and the movement of the spray arms during the washing steps to be constant and thereby the program and program parameter selections can be made with a high precision.
  • If one of the turbidity measurements is performed while only the upper spray arm operates and the other while both spray arms operate during the washing steps, the deviation due to the motion of the spray arm will be high in one of these two measurements and low in the other. Similarly, even if the two measurements are taken while only the upper spray arm operates, and if the spray arm speed in one measurement is high and low in the other, the deviations manifested will be different. With the present invention, this problem is averted by performing the turbidity measurement while the speed of the pump motor and/or to which spray arm water will be directed is at a value predetermined by the producer (e.g. when only the upper spray arm is rotating with the speed w).
  • In an embodiment of the present invention, the turbidity sensor takes measurements only while the upper spray arm is rotating. Accordingly, measurement is taken while water is sprayed into the washing chamber with a lower pressure thereby minimizing the deviation in the measurement.
  • In another embodiment of the present invention, the turbidity measurements are taken while both of the spray arms are rotating. Thus, measurements are made with identical deviations without disrupting the normal working process by taking the measurement in a frequent condition of the dishwasher during washing.
  • In an embodiment of the present invention, the turbidity is measured while the speed of the pump motor actuating the spray arms is at value predetermined by the producer.
  • In an embodiment of the present invention, the speed of the pump motor predetermined by the producer for taking measurements is not a speed at which the pump motor operates normally during the program steps of the dishwasher. For example, while the pump motor is operated at 2500-3000 rpm speed, the speed of the pump motor is reduced to 1500 rpm and measurement is performed when the turbulence that will cause deviation in the sprayed water is lower.
  • The dishwasher realized in order to attain the aim of the present invention is illustrated in the attached figures, where:
  • Figure 1 - is the schematic view of a dishwasher.
  • The elements illustrated in the figures are numbered as follows:
    1. 1. Dishwasher
    2. 2. Washing chamber
    3. 3. Pump motor
    4. 4. 104. Spray arm
    5. 5. Turbidity sensor
  • The dishwasher (1) provides cleaning of the dishes in accordance with a washing program that includes at least some of the various steps like pre-washing, main washing, rinsing, drying, regeneration.
  • The dishwasher (1) comprises a washing chamber (2) wherein the dishes to be washed are emplaced, at least one spray arm (4, 104) that sprays water on the dishes while rotating around its axis, at least one pump motor (3) for the water to be circulated and to be sprayed from the spray arms (4, 104), at least one turbidity sensor (5) that performs the wash water turbidity measurements in order to detect the dirtiness of the dishes only while the speed (w) of the pump motor (3) is at a constant value predetermined by the producer and/or while water is directed to always the same spray arm/spray arms (4, 104) (Figure 1).
  • In the preferred embodiment of the present invention, two spray arms (4, 104), an upper (4) one and a lower (104) one, are used.
  • In an embodiment of the present invention, the turbidity sensor (5) takes measurements only while the upper spray arm (4) is rotating.
  • In another embodiment of the present invention, the turbidity sensor (5) takes measurements while both of the spray arms (4, 104) are rotating.
  • In the preferred embodiment of the present invention, a variable speed, brushless direct current pump motor (3) is used. In this embodiment, the turbidity sensor (5) takes measurements while the speed (w) of the pump motor (3) is at a value (wm) predetermined by the producer.
  • In an embodiment of the present invention, the speed (wm) of the pump motor (3) predetermined by the producer for taking measurements is a speed not normally used by the pump motor (3) during the program steps of the dishwasher (1). For example, while the pump motor (3) rotates with 2500-3000 rpm speed for pumping water in order to perform the washing processes, the turbulence of the water is high. In order to have a lower deviation in the measurement, the speed of the pump motor (3) is reduced to 1500 rpm and turbidity measurement is performed at this speed.
  • By means of the present invention, the deviation in the measurement of the turbidity sensor (5) caused by the turbulence generated due to the speed and direction of water intake into the washing chamber (2) or the motion of the spray arms (4, 104) during the washing steps is maintained to be constant thereby increasing the accuracy in selections of program and program parameters performed in accordance with the data received from the turbidity sensor (5).

Claims (4)

  1. A dishwasher (1) that comprises a washing chamber (2) wherein the dishes to be washed are emplaced, at least one spray arm (4, 104) that sprays water on the dishes while rotating around its axis, at least one pump motor (3) for the water to be circulated and to be sprayed from the spray arms (4, 104), at least one turbidity sensor (5) that measures the turbidity of the water in order to detect the dirtiness of the dishes characterized in that the turbidity sensor (5) performs the wash water turbidity measurements only while the speed (w) of the pump motor (3) is at a constant value predetermined by the producer and/or while water is directed to always the same spray arm/spray arms (4, 104).
  2. A dishwasher (1) as in Claim 1, characterized by two spray arms (4, 104), an upper (4) one and a lower (104) one, wherein the turbidity sensor (5) takes measurements only while the upper spray arm (4) is rotating.
  3. A dishwasher (1) as in Claim 1, characterized by two spray arms (4, 104), an upper (4) one and a lower (104) one, wherein the turbidity sensor (5) takes measurements only while both of the spray arms (4, 104) are rotating.
  4. A dishwasher (1) as in any one of the above claims, comprising a variable speed pump motor (3) and characterized in that the turbidity sensor (5) takes measurements only after the speed (w) of the pump motor (3) is changed to a value (wm) predetermined by the producer.
EP08774611A 2007-07-02 2008-07-02 A dishwasher Active EP2175766B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08774611T PL2175766T3 (en) 2007-07-02 2008-07-02 A dishwasher

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR200704577 2007-07-02
PCT/EP2008/058468 WO2009004014A1 (en) 2007-07-02 2008-07-02 A dishwasher

Publications (2)

Publication Number Publication Date
EP2175766A1 EP2175766A1 (en) 2010-04-21
EP2175766B1 true EP2175766B1 (en) 2010-10-06

Family

ID=39720111

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08774611A Active EP2175766B1 (en) 2007-07-02 2008-07-02 A dishwasher

Country Status (5)

Country Link
EP (1) EP2175766B1 (en)
AT (1) ATE483392T1 (en)
DE (1) DE602008002949D1 (en)
PL (1) PL2175766T3 (en)
WO (1) WO2009004014A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1392420B1 (en) † 2008-12-22 2012-03-02 Indesit Co Spa DISHWASHER.
KR20240023786A (en) 2022-08-16 2024-02-23 엘지전자 주식회사 Dish washer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040079400A1 (en) * 2002-10-25 2004-04-29 Young Raymond A. Dishwasher having a variable speed circulation pump controlled responsive to sensed turbidity
DE10319467B3 (en) * 2003-04-29 2004-07-22 Miele & Cie. Kg Device for preventing foam or air bubbles in measuring zone of turbidity sensor for dishwasher or laundry machine with turbulence region incorporated in bypass line across main flow line
DE10359841A1 (en) * 2003-12-19 2005-07-21 Electrolux Home Products Corporation N.V. Dishwasher with a liquid distribution device and method for switching the same
US7588038B2 (en) * 2004-06-05 2009-09-15 Lg Electronics Inc. Sump assembly for dishwasher
KR20060010361A (en) * 2004-07-28 2006-02-02 엘지전자 주식회사 Turbidity sensor mounting structure of the dishwasher

Also Published As

Publication number Publication date
PL2175766T3 (en) 2011-01-31
EP2175766A1 (en) 2010-04-21
ATE483392T1 (en) 2010-10-15
DE602008002949D1 (en) 2010-11-18
WO2009004014A1 (en) 2009-01-08

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