EP1208790A3 - Dishwasher provided with a device for impeding the accumulation of air bubbles and foam in the measurement area of a turbidity sensor - Google Patents

Dishwasher provided with a device for impeding the accumulation of air bubbles and foam in the measurement area of a turbidity sensor Download PDF

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Publication number
EP1208790A3
EP1208790A3 EP01125828A EP01125828A EP1208790A3 EP 1208790 A3 EP1208790 A3 EP 1208790A3 EP 01125828 A EP01125828 A EP 01125828A EP 01125828 A EP01125828 A EP 01125828A EP 1208790 A3 EP1208790 A3 EP 1208790A3
Authority
EP
European Patent Office
Prior art keywords
air bubbles
foam
turbidity sensor
measuring zone
accumulation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01125828A
Other languages
German (de)
French (fr)
Other versions
EP1208790B1 (en
EP1208790A2 (en
Inventor
Erik Ekelhoff
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.)
Miele und Cie KG
Original Assignee
Miele und Cie KG
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 Miele und Cie KG filed Critical Miele und Cie KG
Publication of EP1208790A2 publication Critical patent/EP1208790A2/en
Publication of EP1208790A3 publication Critical patent/EP1208790A3/en
Application granted granted Critical
Publication of EP1208790B1 publication Critical patent/EP1208790B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Optical Measuring Cells (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

Bei einer Geschirrspülmaschine mit einer Einrichtung zur Verhinderung einer Schaum- oder Luftblasenansammlung in der strömungsberuhigten Messzone (14) eines im Spülwasserkreislauf angeordneten Trübungssensors (13) ist die Messzone mit dem Trübungssensor in einem waagerecht verlaufenden Leitungsweg der Spülflüssigkeit angeordnet, welcher gegenüber der vorgeschalteten Zuleitung (12) einen sich stetig vergrößernden Strömungsquerschnitt besitzt. Eine solche Ausbildung der Messzone ermöglicht vorteilhaft eine Trennung von Schaum und/oder Luftblasen (17) aus der auf Trübung zu sensierenden Spülflüssigkeit (16) und vereinfacht die Signalauswertung. Die durch die Mess-Strecke des optischen Sensors "schwimmenden" Partikel, die für kurze Augenblicke jeweils das Licht der Optik absorbieren, werden auch tatsächlich nur als Signalsprünge von Schmutzpartikeln erkannt, herausgefiltert und in verwertbare Signale umgewandelt.

Figure 00000001
In a dishwasher with a device for preventing accumulation of foam or air bubbles in the flow-calmed measuring zone (14) of a turbidity sensor (13) arranged in the rinsing water circuit, the measuring zone with the turbidity sensor is arranged in a horizontally extending conducting path of the rinsing liquid, which is opposite the upstream supply line (12 ) has a steadily increasing flow area. Such a design of the measuring zone advantageously makes it possible to separate foam and / or air bubbles (17) from the rinsing liquid (16) to be sensed for turbidity and simplifies the signal evaluation. The particles "floating" through the measurement path of the optical sensor, which absorb the light of the optics for brief moments, are actually only detected as signal jumps of dirt particles, filtered out and converted into usable signals.
Figure 00000001
EP01125828A 2000-11-28 2001-10-30 Dishwasher provided with a device for impeding the accumulation of air bubbles and foam in the measurement area of a turbidity sensor Expired - Lifetime EP1208790B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10059112A DE10059112C1 (en) 2000-11-28 2000-11-28 Electric dishwashing machine has turbidity sensor measuring zone provided with gradually increasing flow cross-section for preventing collection of foam or air bubbles
DE10059112 2000-11-28

Publications (3)

Publication Number Publication Date
EP1208790A2 EP1208790A2 (en) 2002-05-29
EP1208790A3 true EP1208790A3 (en) 2005-03-02
EP1208790B1 EP1208790B1 (en) 2006-10-25

Family

ID=7665013

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01125828A Expired - Lifetime EP1208790B1 (en) 2000-11-28 2001-10-30 Dishwasher provided with a device for impeding the accumulation of air bubbles and foam in the measurement area of a turbidity sensor

Country Status (5)

Country Link
US (1) US7246625B2 (en)
EP (1) EP1208790B1 (en)
AT (1) ATE343344T1 (en)
DE (2) DE10059112C1 (en)
ES (1) ES2272395T3 (en)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10146641C1 (en) * 2001-09-21 2002-12-12 Miele & Cie Scum or air bubbles collection prevention device for test area on sensor for cloudiness in washing machine, incorporates test area with sensor in access pipe acting as air bubble separator
US7032604B2 (en) * 2002-05-28 2006-04-25 Maytag Corporation Three rack dishwasher
DE10248538A1 (en) * 2002-10-17 2004-04-29 Aweco Appliance Systems Gmbh & Co. Kg Water dirtiness measurement method for use with a dishwasher, whereby the heating rate of an electrical heating element is used as an indicator, in conjunction with a computation or look-up function, of water dirtiness
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
NZ569965A (en) * 2007-07-23 2009-02-28 Fisher & Paykel Appliances Ltd Appliance pump
DE102007052332A1 (en) 2007-10-31 2009-05-07 Miele & Cie. Kg Dishwasher with a turbidity sensor
DE102008020475A1 (en) 2008-04-23 2009-11-05 Miele & Cie. Kg Rinse cycle executing method for program-controlled household dishwasher, involves draining liquid from container at end of rinse cycle, and operating draining device and pump number of times alternatively during exchange
IT1392420B1 (en) † 2008-12-22 2012-03-02 Indesit Co Spa DISHWASHER.
US9918609B2 (en) * 2009-12-21 2018-03-20 Whirlpool Corporation Rotating drum filter for a dishwashing machine
DE102011053548A1 (en) 2011-09-13 2013-03-14 Miele & Cie. Kg Process for cleaning a rinse liquor storage tank
DE102011053545A1 (en) 2011-09-13 2013-03-14 Miele & Cie. Kg Method for operating a washing machine with a rinsing liquor storage tank
DE102012200614A1 (en) * 2011-09-20 2013-03-21 Dürr Ecoclean GmbH Cleaning system for workpieces with operating state monitoring
WO2016205744A1 (en) * 2015-06-17 2016-12-22 Flodesign Sonics, Inc. Turbidity sensor with improved flow path
US9661980B2 (en) * 2015-10-09 2017-05-30 Bsh Home Appliances Corporation Pre-soak option for dishwashers
US11026559B2 (en) * 2019-09-30 2021-06-08 Midea Group Co., Ltd. Dishwasher with image-based fluid condition sensing
US11464389B2 (en) 2019-09-30 2022-10-11 Midea Group Co., Ltd. Dishwasher with image-based detergent sensing
US11399690B2 (en) 2019-09-30 2022-08-02 Midea Group Co., Ltd. Dishwasher with cam-based position sensor
US11191416B2 (en) 2019-09-30 2021-12-07 Midea Group Co., Ltd. Dishwasher with image-based position sensor
US11259681B2 (en) 2019-09-30 2022-03-01 Midea Group Co., Ltd Dishwasher with image-based diagnostics
US11484183B2 (en) 2019-09-30 2022-11-01 Midea Group Co., Ltd. Dishwasher with image-based object sensing
US11185209B2 (en) 2019-11-20 2021-11-30 Midea Group Co., Ltd. Dishwasher steam generator
US11202550B2 (en) 2019-11-20 2021-12-21 Midea Group Co., Ltd. Dishwasher thermal imaging system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5140168A (en) * 1990-12-03 1992-08-18 Great Lakes Instruments, Inc. Turbidimeter signal processing circuit using alternating light sources
US5331177A (en) * 1993-04-26 1994-07-19 Honeywell Inc. Turbidity sensor with analog to digital conversion capability
US5800628A (en) * 1996-10-22 1998-09-01 Honeywell Inc. Continuous cycle operation for dishwashers using turbidity sensor feedback

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04215736A (en) * 1990-12-12 1992-08-06 Mitsubishi Electric Corp Dish washer
JP3067248B2 (en) * 1991-04-17 2000-07-17 石川島播磨重工業株式会社 Ion source
JPH04319329A (en) * 1991-04-19 1992-11-10 Mitsubishi Electric Corp Drainage turbidity detecting device
JPH05269075A (en) * 1992-03-25 1993-10-19 Toto Ltd Dish-washing machine and operating method therefor
US5586567A (en) * 1995-01-10 1996-12-24 General Electric Company Dishwasher with turbidity sensing mechanism
US5555583A (en) * 1995-02-10 1996-09-17 General Electric Company Dynamic temperature compensation method for a turbidity sensor used in an appliance for washing articles
DE19705927A1 (en) * 1997-02-17 1998-08-20 Aeg Hausgeraete Gmbh Dishwasher with a device for determining the degree of contamination of a washing liquid
US5831727A (en) * 1997-04-29 1998-11-03 Hach Company Bubble elimination from liquid
DE19831688C1 (en) * 1998-07-15 2000-04-06 Whirlpool Co Optical sensor
DE19949801A1 (en) * 1999-10-15 2001-04-19 Bsh Bosch Siemens Hausgeraete Method and device for determining the type and concentration of admixtures in a liquid
DE10040483A1 (en) * 2000-08-18 2002-03-07 Miele & Cie Method for determining the degree of contamination of the washing liquid in a program-controlled dishwasher equipped with a turbidity sensor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5140168A (en) * 1990-12-03 1992-08-18 Great Lakes Instruments, Inc. Turbidimeter signal processing circuit using alternating light sources
US5331177A (en) * 1993-04-26 1994-07-19 Honeywell Inc. Turbidity sensor with analog to digital conversion capability
US5800628A (en) * 1996-10-22 1998-09-01 Honeywell Inc. Continuous cycle operation for dishwashers using turbidity sensor feedback

Also Published As

Publication number Publication date
ES2272395T3 (en) 2007-05-01
DE50111309D1 (en) 2006-12-07
ATE343344T1 (en) 2006-11-15
EP1208790B1 (en) 2006-10-25
US7246625B2 (en) 2007-07-24
US20020062849A1 (en) 2002-05-30
EP1208790A2 (en) 2002-05-29
DE10059112C1 (en) 2002-05-08

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