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Method and device for detecting foam in a washing machine

A technology of washing machine and foam, which is applied to the control device of washing machine, washing device, other washing machines, etc., and can solve the problems of unclear signal of pressure sensor and inability to detect foam

Inactive Publication Date: 2009-12-23
BSH BOSCH & SIEMENS HAUSGERAETE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As described further below, the signal emitted by the pressure sensor is unclear, so that a reliable foam detection cannot thereby be carried out

Method used

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  • Method and device for detecting foam in a washing machine
  • Method and device for detecting foam in a washing machine
  • Method and device for detecting foam in a washing machine

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0016] figure 1 The graphical line shown in shows the elapsed time t of the washing process on the x-axis and the drum speed value (graphical line N) on the y-axis, and the result of the detergent solution state in the tub. pressure 0 and the conductance G of the detergent solution 0 , which are each measured with a measuring device attached to the barrel without foam formation at all.

[0017] The laundry treatment process is mainly divided into four stages: wetting B, washing W, rinsing R and spin-drying S. In the wet B phase, fresh water and detergent are supplied, and the wash drum is powered at a small speed, eg 25 Upm. During this phase, the pressure P in the bucket first increases according to the amount of water filled and then decreases (here, shown in simplified form) in stages to a constant pressure P 0 , which is also maintained in the wash phase W. At the same time, the conductance G of the detergent solution increases significantly initially by filling with ...

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PUM

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Abstract

A method for detecting foam in a detergent solution (17) in a burrel (2) of a washing machine emploies electrodes (16), and a measurement voltage is applied to the electrodes (16). By means of determining an electric field between the electrodes and measuring the amount of the foam according to the size of the electric field, it is capable of determining the formation of the foam firstly when a moistening process or a washing process of a washing / processing process is started, such that emergency actions for preventing, eliminating and damaging the foam formation may be implemented before a washing mechanism is damaged in a large time segment of a processing process. A device for implementing the method mainly includes a measurement transducer (14), which is provided with two electrodes (16) in a passage type casing (15) which may be passed through by a cleaner solution (17), and the electric field of the electrode obtained in the clearance of the electrodes may display a conductance radio of the cleaner solution. If the cleaner solution (17) still has foam, the conductance radio G will be changed.

Description

technical field [0001] The invention relates to a method for identifying foam formed in washing liquid in a tub of a washing machine by using electrodes, and a washing machine comprising means for implementing the method. Background technique [0002] Numerous methods and devices are known in the past for the detection of foam during wet treatment, especially under the influence of detergent in the wash liquor, and in particular under the influence of heating and vigorous movement of the detergent solution , The most important thing is to form during the rotation of the washing drum in the bucket to generate motion, wherein, the washing liquid is called detergent solution below. DE3703917A1 for example proposes to also observe the formation of foam in the detergent solution by using a pressure sensor which has been provided for measuring the level of the detergent solution in the tank. During the movement of the washing drum, reaching a pressure threshold indicates that som...

Claims

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Application Information

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IPC IPC(8): D06F39/00D06F21/02D06F39/04D06F39/02D06F39/08D06F33/36D06F33/38D06F34/14
CPCD06F39/004D06F35/006D06F33/36D06F34/14D06F33/38D06F2105/02D06F2105/42
Inventor I·舒尔茨
Owner BSH BOSCH & SIEMENS HAUSGERAETE GMBH