KR20080045995A - Method for sensing foam of laundry treatment machine - Google Patents

Abstract

A method for sensing bubbles of a washer is provided to prevent accident caused by bubbles and to prevent a motor from being overheated by sensing rotating time and rotational speed of the motor several times and sensing bubbles several times. A method for sensing bubbles of a washer comprises the steps of: sensing bubbles if rotational speed of a motor reaches to a first rotational speed within a predetermined time when in a dehydration process(S50); and re-sensing bubbles if bubble are not sensed and the rotational speed of the motor reaches to a second rotational speed(S60).

Description

Method for sensing foam of laundry treatment machine

1 is a cross-sectional view of a drum washing machine according to the prior art,

Figure 2 is a flow chart illustrating a foam detection method of the drum washing machine according to an embodiment of the present invention,

3 is a graph illustrating a change in rotational speed with time when bubbles are generated.

The present invention relates to a foam detection method of a laundry treatment device, and more particularly, to a foam detection method of a laundry treatment device in which the accuracy of foam detection can be improved by sensing a rotation time and a rotation speed of a motor a plurality of times during dehydration administration. .

In general, a laundry treatment machine uses a washing machine to remove dirt from laundry such as clothes and bedding by using water, detergent, and mechanical action, and dry hot air heated by a heater and mechanical action. It is divided into a dryer to dry, and a dry washing machine which has a washing function and a drying function.

1 is a cross-sectional view showing the inside of a drum washing machine according to the prior art.

As shown in FIG. 1, a drum washing machine according to the related art includes a cabinet 2, a tub 4 installed in the cabinet 2, and a drum rotatably disposed in the tub 4. (6), a motor (not shown) for rotating the drum (6), a water supply device (8) for supplying wash water to the tub (4), and wash water in the tub (4) to the outside It includes a drain 10. The drainage device 10 includes a drain hose 11 connected to the bottom of the tub 4 and a drain pump 12 connected to the drain hose 11.

In addition, the drum washing machine includes a water level sensor 14 for detecting the level of the wash water, wherein the water level sensor 14 is installed above the pressure chamber 16 connected to the drain hose 11.

Therefore, when the wash water is supplied into the tub 4, the pressure in the pressure chamber 16 is changed according to the level of the wash water, the water level sensor 14 is the water level through the pressure change in the pressure chamber 16 Will be judged.

In addition, if excessive foam is generated in the tub 4 during the washing process, the pressure in the tub 4 rises above a predetermined value, thereby detecting whether the foam is excessive. If it is determined that excessive bubbles are generated, a bubble removing stroke in which water and drainage are repeated is performed.

On the other hand, when the washing stroke is completed, the washing water is drained, rinsing, dehydrating stroke is performed, if the drum 6 is rotated at high speed during the dehydrating stroke, excessive foam is generated by the detergent component remaining in the fabric. .

However, the water level sensor of the drum washing machine according to the prior art can not detect the foam generated excessively during the dehydration stroke after the wash water is drained, the foam generated during the dehydration stroke leaks safety due to corrosion or leakage of surrounding components There is a problem that an accident occurs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a foam detection method of a laundry treatment device that can accurately detect the generation of bubbles during dehydration administration.

The present invention is the first bubble detection step of detecting whether the bubble is generated according to whether or not the rotational speed of the motor reaches the first rotational speed within a predetermined time during the dehydration administration, and the foaming is not detected in the first bubble detection step Otherwise, the second bubble detection step is included depending on whether or not the rotation speed of the motor reaches a preset second rotation speed within a predetermined time after the first bubble detection step.

The first bubble detection step includes a rotation time detection process for detecting whether the rotation time of the motor has exceeded a predetermined time from the entry of the dehydrating stroke, and the rotation speed of the motor within the predetermined first rotation speed is within the predetermined first rotation speed. It includes a rotational speed detection process for detecting whether it reaches.

The second bubble detection step includes a rotation time detection process for detecting whether the rotation time of the motor exceeds a predetermined time after the first bubble detection step, and the rotation speed of the motor within the predetermined time is within the first rotation. And a rotation speed detection process for detecting whether a second rotation speed higher than the speed is reached.

And performing a bubble removing stroke if the rotation speed of the motor does not exceed the first rotation speed within the predetermined time in the first bubble detection step.

And performing a bubble removing stroke when the rotational speed of the motor does not exceed the second rotational speed within the predetermined time in the second bubble detection step.

The dehydration administration includes simple dehydration and bone dehydration, and the first and second bubble detection steps are performed at the time of dehydration.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a flow chart illustrating a foam detection method of the drum washing machine according to an embodiment of the present invention.

In the dehydration operation of the drum washing machine, the motor is rotated at a low speed, and the simple dehydration for dehydrating the laundry is performed. Thereafter, when the simple dehydration is completed, the motor is rotated at a higher speed than the simple dehydration, and the main dehydration is performed to dehydrate the laundry secondaryly.

As shown in FIG. 2, the bubble detection method is performed at the time of entering the dehydration. When entering the dehydration and the motor is rotated at a high speed, the first bubble detection step is performed by detecting the rotation time and the rotation speed of the motor. . (S50)

First, a first rotation time detection process for detecting whether the rotation time of the motor exceeds a predetermined time from the time of entering the dehydration is performed. (S51) Here, if the motor is continuously rotated in a state where bubbles are generated, Since the motor is not accelerated and overheated, it is preferable to limit the rotation time of the motor. Therefore, the predetermined time is a time limit for preventing the motor from overheating, which will be described here as being limited to 25 seconds.

Then, by detecting the rotational speed of the motor for 25 seconds (S52), and performs a first rotational speed detection process for comparing the detected rotational speed and the first predetermined rotational speed. Here, the first rotational speed is limited to 320 rpm.

At this time, if the rotational speed of the motor does not reach 320 rpm and exceeds 25 seconds, it is determined that the motor is not accelerated by the generation of bubbles. (S54) Therefore, the water supply and drainage are repeated to remove the bubbles. Perform the defoaming stroke. (S55)

On the other hand, when the rotational speed of the motor reaches 320rpm within 25 seconds, it is determined that no bubbles are generated in the first bubble detection step, and continues to rotate the motor to perform a second bubble detection step. )

First, a second rotation time detection process for detecting whether the rotation time of the motor exceeds a predetermined time is performed (S61). Here, the predetermined time is limited to being within 50 seconds from the time of entering the dehydration. However, it is also possible to set the time detected from the time when the rotational speed of the motor reaches 320rpm.

Then, the rotational speed of the motor is sensed within 50 seconds from the time of entering the dehydration, and a second rotational speed sensing process is performed to compare the detected rotational speed with a preset second rotational speed (S62). The rotational speed is limited to 400 rpm.

If the rotational speed of the motor does not reach 400 rpm within 50 seconds, it is determined that bubbles have occurred (S54), and performs a bubble removing stroke to remove the bubbles (S55).

On the other hand, if the rotational speed of the motor reaches 400rpm within 50 seconds, it is determined that no bubbles are generated, and proceeds to dehydration (S63).

3 is a graph illustrating a change in rotational speed with time when bubbles are generated.

As shown in Figure 3, not only does not reach 320rpm within 25 seconds from the main dehydration entry (A), but even if it reaches 320rpm within 25 seconds from the main dehydration entry does not reach 400rpm within 50 seconds from the main dehydration entry Even if it fails (B), it can be determined that the bubble is generated.

Thus, the accuracy of bubble detection can be improved.

Foam detection method of the laundry treatment machine according to the present invention by detecting the rotation time and rotation speed of the motor multiple times during dehydration administration, and performs the foam detection a plurality of times, thereby improving the accuracy of foam detection safety accidents caused by foam generation Since it can be prevented in advance, there is an effect that reliability can be improved.

In addition, by detecting the rotational speed of the motor within the predetermined time, there is an advantage that can prevent the motor from overheating unnecessarily.

Claims (6)

A first bubble detection step of detecting whether bubbles are generated depending on whether the rotational speed of the motor reaches the first rotational speed within a predetermined time during dehydration operation; If bubbles are not detected in the first bubble detection step, the second bubble detection step is included depending on whether the rotation speed of the motor reaches a preset second rotation speed within a predetermined time after the first bubble detection step. Foam detection method of the laundry treatment machine. The method according to claim 1, The first bubble detecting step includes a rotation time detection process for detecting whether the rotation time of the motor exceeds a predetermined time from the entry of the dehydration stroke, and the rotation speed of the motor reaches a predetermined first rotation speed within the predetermined time. Foam detection method of a laundry treatment machine comprising a rotational speed detection process for detecting whether or not. The method according to claim 1, The second bubble detection step includes a rotation time detection process for detecting whether the rotation time of the motor exceeds a predetermined time after the first bubble detection step, and the rotation speed of the motor within the predetermined time is within the first rotation. Foam detection method of a laundry treatment machine comprising a rotational speed detection process for detecting whether the second rotational speed higher than the speed. The method according to claim 1, And if the rotational speed of the motor does not exceed the first rotational speed within the predetermined time in the first bubble detection step, performing a bubble removing stroke. The method according to claim 1, And performing a bubble removing stroke if the rotation speed of the motor does not exceed the second rotation speed within the predetermined time in the second bubble detection step. The method according to claim 1, The dehydration administration includes a simple dehydration and the main dehydration, wherein the first and second bubble detection step is a bubble detection method of the laundry treatment apparatus is carried out when the dehydration.

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