KR200143535Y1 - Apparatus for foam detection of a washing machine - Google Patents

Abstract

The present invention relates to a foam sensing device of a washing machine, a foam sensing unit for converting the Yal of the foam in contact with the electrical signal and output, the amount of foam is determined according to the electrical signal output from the foam sensing unit, When the amount of the foam is greater than the reference amount provided by the control unit for outputting a warning signal, the drive status display unit for outputting the warning signal output from the control unit as a visual signal or an audio signal is provided with a foam detection device of the washing machine Thus, when an excessive amount of foam is generated in the washing process, it can be detected and a warning message can be output.

Description

Foam detector in the washing machine

1 is a schematic block diagram of a general drum washing machine.

2 is a schematic block diagram of a drum washing machine to which the present invention is applied.

3 is a schematic cross-sectional view of the laundry shown in FIG.

4 is a detailed circuit diagram of the bubble detector shown in FIG.

* Explanation of symbols for main parts of the drawings

1: washing unit 10: washing tank

2: water supply unit 11: tub

3: drain 12: buffer spring

4 drive unit 13 shock absorber

5 driving state display unit 14 electrode plate

6: control unit 15: high frequency insulation transformer

7: bubble detection unit 16: capacitor

8: control unit 17, 19: comparator

9: driving state display unit 19 to 26: resistance

The present invention relates to a foam sensing device of a washing machine, and more particularly, to a foam sensing device of a washing machine that detects this when excessive foam is generated in the washing process and outputs a warning message.

1 is a schematic block diagram of a general drum washing machine, a washing unit 1 for washing laundry through a rotary motion, a water supply unit 2 for supplying washing water for washing to the washing unit 1, and washing. The drainage part 3 for discharging the washing water generated in the process to the outside, the driving part 4 for operating the washing part 1, and the driving state of the drum washing machine with audiovisual signals such as letters, numbers, figures, and warning bells. It consists of a driving state display part 5 to display, and each above-mentioned part is controlled by the control part 6. As shown in FIG.

In general, when the laundry detergent in excess of the appropriate amount is administered in the drum washing machine as described above, an excessive amount of foam may be generated during the washing process.

Even after repeated rinsing cycles in which excessive bubbles are generated several times, bubbles remain, thereby causing insufficient washing.

In addition, since the initial tanker user who is excessively foamed to detect this and can not take any action in advance, only the rinse stroke is repeated more than necessary, so that the mura capacity is increased, unnecessary power is consumed, and the fabric is damaged. There was a problem.

Accordingly, the present invention is to solve the above problems, an object of the present invention is to improve the foam detection device of the washing machine that can detect the amount of foam generated excessively in the washing process and output a warning message.

Features of the present invention for achieving the above object, the bubble detection unit for converting the amount of the contacted foam to a periodic signal and outputs, and determines the amount of foam in accordance with the electrical signal output from the bubble detection unit The foam detection apparatus of the washing machine is provided with a control unit for outputting a warning signal when the determined amount of foam is greater than the reference amount, and a driving state display unit for outputting a warning signal output from the control unit as a visual signal or an audio signal.

Hereinafter, on the basis of the accompanying drawings will be described in detail a preferred embodiment of the foam detection apparatus of the washing machine according to the present invention.

The foam sensing unit 7 converts the amount of foam generated by the washing unit 1 into an electrical signal and outputs the electrical signal output from the foam detecting unit 7, and detects the amount of foam and detects the amount of foam. When the amount of bubbles is more than the reference amount is composed of a control unit 8 for outputting a warning signal and a drive state display unit 9 for outputting the warning signal output from the control unit 8 as an audiovisual warning message such as a text and a warning ring. .

FIG. 3 is a schematic cross-sectional view of the washing unit 1 shown in FIG. 2, which supports the washing tank 10 and the washing tank 10 that are rotated by the driving unit 4 to wash the laundry. The tub 11, the washing tank 10 and the tub 11 to support the shock absorber 13 and the shock absorber 13 to absorb the vibration generated by the rotational movement of the washing tank 10 On the other hand, the foam detection unit 7 is located between the washing tank 10 and the tub (11).

FIG. 4 is a detailed circuit diagram of the bubble detecting unit shown in FIG. 2, which is configured to convert a predetermined DC driving voltage Vccl supplied from an electrode plate 14 made of a plate-shaped conductor and externally through a resistor 19. FIG. A capacitor 16 having one side grounded at the same time as the high frequency insulated transformer 15 and the inverting terminal (-), which are transformed by ratio and supplied to the electrode plate 14, are connected to the parallel-connected resistor 19 and the high frequency insulated transformer 15. ) Is connected in common, and the non-inverting terminal (+) is commonly connected to a predetermined DC driving voltage (Vcc2) through the resistor 20, the resistor 21 having one side grounded, and the resistor 22, and the output terminal The first comparator connected to the predetermined DC driving voltage Vcc1 through the resistor 23 and the inverting terminal (-) are connected to the predetermined DC driving voltage Vcc3 through the resistor 24 and one side thereof is grounded. Commonly connected to the resistor 25, the non-inverting terminal (+) is a predetermined DC drive voltage (Vcc1) through the output terminal of the first comparator 17 and the resistor 23 And a second comparator 18 connected in common with the resistor 22 and having an output terminal connected to a predetermined DC driving voltage Vcc4 through the resistor 26 and the controller 6.

An operation example of the present invention having the above-described configuration will be described in detail with reference to FIGS. 2 and 3.

In a state where a predetermined level of voltage is supplied to the electrode plate 14 through the high frequency insulated transformer 15, when the electrode plate 14 is not in contact with the foam, it is naturally generated by air contacting the electrode plate 14. A sinusoidal alternating current voltage of about oscillation frequency (approximately, 4.8 to 5.0 KHz) is induced from the secondary side of the high frequency insulation transformer 15 to the primary side, and is supplied to the inverting terminal (-) of the first glider 17.

When the foam is in contact with the electrode plate 14, the resistance value is changed according to the amount of the foam, so that a sinusoidal AC voltage having a frequency corresponding to the variable resistance value is supplied to the inverting terminal (-) of the first comparator 17. The sinusoidal alternating current voltage supplied to the inverting terminal (-) of the comparator 17 is converted into a square wave and outputted through the output terminal of the comparator 17. Here, the sine wave AC voltage is converted into a square wave, which is divided by the resistor 20 and the resistor 21 into the DC driving voltage Vcc2 supplied from the outside and input to the non-inverting terminal (+) of the first comparator. This is because the reference voltage level is compared with the voltage level of the sinusoidal alternating voltage described above, and is output at a constant voltage level only while the sinusoidal alternating voltage level is equal to or higher than the reference voltage level. In addition, the square wave output through the output terminal of the comparator 17 is output in an inverted phase inverted from the phase of the sine wave input to the inverting terminal (-) of the comparator 17.

The square wave output through the output terminal of the comparator 17 does not have the shape of a complete square wave. The square wave is input to the non-inverting terminal (+) of the second comparator 18 and is a more complete square wave. Output through the output terminal of).

The square wave of the predetermined frequency output from the output terminal of the second comparator 18 is input to the controller 8. The frequency of the above-mentioned square wave has a different value depending on the amount of bubbles in contact with the electrode plate 12, so that the controller 8 can detect the amount of bubbles by detecting the frequency of the input square wave.

Subsequently, when it is determined that the detected amount of foam is excessive, the controller 8 controls the driving state display unit 9 to output a warning message as a text or an alarm bell sound.

As described above, according to the foam detecting apparatus of the washing machine according to the present invention, when an excessive amount of foam is generated in the washing process, it detects this and has an effect of outputting a warning message.

Claims (3)

A bubble detecting unit converting the amount of bubbles in contact with an electric signal and outputting the converted signal; A controller for determining the amount of bubbles according to the electrical signal output from the bubble detector, and outputting a warning signal if the amount of bubbles determined is higher than the reference amount; And a driving state display unit for outputting a warning signal output from the control unit as a visual signal or an audio signal. The method of claim 1, wherein the bubble detecting unit, while applying a voltage to the electrode plate and the electrode plate in which the resistance value is changed in accordance with the amount of bubbles in contact with, the variable by the resistance value change of the electrode plate A foam sensing device for a washing machine comprising: a high frequency insulated transformer for outputting a sine wave voltage having a frequency; and a square wave generator for converting a sine wave voltage output from the high frequency insulated transformer to a square wave voltage. The bubble detection apparatus of claim 2, wherein the square wave generator comprises a comparator.