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Method and device for detecting foam in a washing machine

A washing machine and bubble technology, which is applied to the control device of washing machine, washing device, and other washing machines, etc., can solve the problems of unclear pressure sensor signal and no bubble detection.

Inactive Publication Date: 2012-07-25
BOSCH SIEMENS HAUSGERATE 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

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Experimental program
Comparison scheme
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Embodiment Construction

[0016] figure 1 The graphed line shown in shows the elapsed time t of the wash process on the x-axis and the drum speed value on the y-axis (graphed line N), and the resulting from the state of the detergent solution in the tub pressure P 0 and the conductance G of the detergent solution 0 , which are respectively measured with a measuring device attached to the barrel in the absence of foam formation at all.

[0017] The laundry treatment process is mainly divided into four stages: wetting B, washing W, rinsing R and centrifugal dehydration S. In the wet B stage, 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 charged, and then decreases over a number of phases (here, shown in simplified form) to a constant pressure P 0 , which is also maintained in the wash phase W. At the same time, priming by using some of the detergent reta...

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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 present 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 a device for implementing the method. Background technique [0002] Numerous methods and devices are known in the past for the identification of foam during the wetting process, in particular under the influence of the detergent in the wash liquor, and in particular under the influence of heating and vigorous movement of the detergent solution , Most importantly, it is formed in the process of the rotation of the washing drum in the tub to generate movement, wherein the washing liquid is hereinafter referred to as the detergent solution. DE 3703917 A1 proposes, for example, 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 tub. During the movement of the washing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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 BOSCH SIEMENS HAUSGERATE GMBH