KR20010002619A - Dehydration driving method for drum type washing machine - Google Patents

Abstract

PURPOSE: A method for dehydrating laundries in a drum type washing machine is provided to improve the washing effect by performing the dehydrating process after completely removing foams contained in the laundries. CONSTITUTION: After the washing process is finished, a rotating drum is rotated in the first speed so as to release the tangling of laundries. At this time, a control section determines whether or not foams are contained in laundries by using the variation of the rotational speed of a motor. If the control section determines that foams are contained in the laundries, the form removing process is carried out. If the control section determines that foams are not contained in the laundries, a balancing process is carried out. At this time, an eccentric value of the laundries is measured. If the measured eccentric value exceeds the reference value, the process is repeated. If the measured eccentric value is lower than the reference value, a dehydrating process is intermittently performed by a predetermined time. Then, the main dehydrating process is carried out with maintaining the motor in a second rotational speed.

Description

Dehydration driving method for drum type washing machine}

The present invention relates to a dewatering operation method of a drum washing machine, and in particular, to improve the cleaning effect, a dehydration operation of a drum washing machine, which detects the presence of foam in laundry after washing is completed, and performs a dehydration operation in a state where bubbles are completely removed. It is about a method.

In general, the drum washing machine has a configuration as shown in Fig. 1, in which reference numeral 1 denotes a main body, and 2 denotes a tub supported in the main body. At this time, the rotating drum (3) is installed inside the tub (2), and the washing motor (4) is installed below the tub (2). The rotating drum (3) and the washing motor (4) is connected to the pulley (pulley) arranged on each of the rotating shaft through the belt (5) by the rotation of the rotating drum (3) in accordance with the drive of the washing motor (4) do.

In addition, a detergent container 6 is installed on the upper part of the main body 1, and a water supply line 7 and a water supply valve 7a are installed to wash water and detergent through the water supply port 7b. Make it into the inside. In addition, a drain line 8 and a drain pump 8a are installed at the lower portion of the tub 2 so that the drainage can be made quickly during the drainage operation and the dehydration operation.

Drum washing machine having the configuration as described above in the state in which the washing water and detergent is introduced into the rotary drum (3) through the water inlet (7b), the washing motor (4) is driven as the rotary drum (3) ) Rotates, washing is performed by impact and stretching action caused by the rising and falling of the laundry.

After washing is performed by the above-described operation, dehydration is performed. The centrifugal force is caused by rotating the rotary drum 3 at a high speed while driving the drainage pump 8a to perform drainage through the drainage line 8. Perform dehydration by

By the way, the rinse is performed before the dehydration operation to remove the detergent components and bubbles. In this case, when the dehydration operation is performed in a state in which the bubble is not removed, the foaming is not performed due to the surface tension of the foam, and thus, the balancing drum is not made, so that the rotating drum for dehydration is performed. The high speed rotation of the c) collides with the inner surface of the tub 2, which causes a problem of severe noise. In addition, the washing motor (4) is subjected to a heavy load is not able to rise to the desired speed to reduce the dehydration efficiency occurs a problem that causes damage to the system.

FIG. 2 is a flowchart illustrating a dehydration process of a drum washing machine according to the prior art, which detects the presence of bubbles and removes bubbles in order to solve the above problems.

In addition, Figure 3 is a waveform diagram showing a change in the rotational speed of the motor with time during the dehydration operation according to the prior art.

2 and 3, after the washing mode is finished, proceed to the dehydration mode, first, by rotating the rotating drum (3) for a predetermined time to 50rpm to perform the folds to eliminate the tangling between the laundry (see S1) ), And the laundry is rotated at a predetermined time at 100 rpm to spread the laundry evenly in the rotating drum 3 so that the rotating drum 3 is balanced. (Refer to S2)

At this time, during the balancing operation, the amount of eccentricity of the rotating drum 3 is measured to determine whether the measured eccentricity is smaller than the reference eccentricity (see S3). And balancing again.

If it is determined in step S3 that the measurement amount of eccentricity is smaller than the reference eccentricity, intermittent dehydration is performed. (See S4.) At this time, the intermittent dehydration reduces the noise generated when a large amount of water is drawn out at the beginning of the dehydration operation, and the washing is performed. In order to reduce the load on the motor 4, the washing motor 4 is accelerated to 450 rpm and decelerated to 100 rpm for a predetermined time.

When the intermittent dehydration operation is completed, it accelerates to 450rpm to perform normal dehydration operation. (Refer to S5) At this time, the acceleration time is measured and it is determined whether the acceleration time is greater than the reference time. (See S6)

If the result of the determination is that the acceleration time is smaller than the reference time, it continuously maintains more than 450rpm to perform normal dehydration (see S7). Finally, in the prior art, when foam is present in the laundry, foaming and balancing operations are not normally performed due to the surface tension of the foam, thereby accelerating to more than 450 rpm for normal dehydration. The rapid acceleration did not take place, so it took a long time to reach the desired rotation speed.

In the above bubble removing operation, there is a method of waiting for bubbles to be naturally removed without performing another operation for a predetermined time, and a method of forcibly removing bubbles by supplying water into the rotating drum 3.

In the dehydration operation method of the drum washing machine according to the prior art as described above, since the foaming and balancing are performed and the foam is sensed in the acceleration section for the normal dehydration, it takes a lot of time to carry out the foaming and balancing. In this case, noise is generated by accelerating up to 450rpm in the presence of bubbles, and there is a problem that mechanical loads are caused by a large load on the system.

The present invention has been made to solve the problems of the prior art as described above, the object of which is to detect and remove the bubbles in the inflating operation by the drum to perform the acceleration and normal dehydration in a state where the bubbles are completely removed It is to provide a dewatering operation method of the washing machine.

In addition, it provides a dewatering operation method of the drum washing machine that can improve the reliability of the detection result by detecting the bubble by using the amount of change in the rotational speed of the rotating drum during the inflating operation.

1 is a cross-sectional view showing the configuration of a general drum washing machine,

2 is a flowchart illustrating a dehydration process of a drum washing machine according to the prior art;

Figure 3 is a waveform diagram showing a change in the rotational speed of the motor with time during the dehydration operation according to the prior art,

4 is a flowchart illustrating a dehydration process of a drum washing machine to which the present invention is applied;

Figure 5 is a waveform diagram showing a change in the rotational speed of the dehydration motor with time depending on the presence of bubbles during the inflating operation according to the present invention.

<Description of Symbols for Main Parts of Drawings>

1: main body 2: tub

3: rotating drum 4: washing motor

5: belt 6: detergent container

7: water supply line 7a: water supply valve

7b: water inlet 8: drain line

8a: drain pump

According to a feature of the present invention for achieving the above object, a first process of performing a fold to remove the tangling of the laundry by rotating the rotating drum at a first speed after the washing mode is finished; A second step of determining whether a bubble exists by using a change in rotational speed of the motor while the first step is performed, and stopping the motor and removing the bubble if the bubble exists; A third step of determining whether the measurement eccentricity is smaller than the reference eccentricity after performing balancing when it is determined that no bubbles exist in the second step; And if the measurement amount of eccentricity is greater than the reference eccentricity in the third process, the process returns to the first process. If the measurement amount of eccentricity is less than the reference eccentricity in the third process, the rotational speed is greater than or equal to the second speed after performing the intermittent dehydration for a predetermined time. It provides a dewatering operation method of the drum washing machine comprising; a fourth process of performing normal dehydration while maintaining.

At this time, according to an additional feature of the present invention, the second process checks the speed of the rotating drum at predetermined time intervals, and counts the number of times that the identified speed is determined to be greater than or equal to the third speed greater than the first speed. If it is continuously confirmed to the third speed or more, the first step of counting by giving a weight; And a second step of determining that bubbles exist if the number of times counted in the first step is greater than the reference number of times, and determining that no bubbles exist if the number of times counted in the first step is less than the reference number of times.

The second process may further include a first step of counting the number of times that the speed of the rotating drum increases above a third speed greater than the first speed or decreases below a fourth speed smaller than the first speed; And a second step of determining that bubbles exist if the number of times counted in the first step is greater than the reference number of times, and determining that no bubbles exist if the number of times counted in the first step is less than the reference number of times.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the drum washing machine dewatering operation method according to the present invention will be described in detail.

4 is a flowchart illustrating a washing process of a drum washing machine to which the present invention is applied.

Referring to FIG. 4, when the washing mode is finished, the dehydration mode is performed, thereby rotating the rotating drum 3 at a speed of 50 rpm for a predetermined time to perform folding to eliminate tangling between laundry. (See S11.) If there is no foam in the case, as shown in (A) of FIG. 5, the rotational speed of the rotating drum 3 becomes constant without significant change, and if foam is present in the laundry, FIG. As shown, a large change occurs in the rotational speed of the rotating drum 3, and the waveform forms a gentle curve.

As a result, the system control unit (not shown) of the drum washing machine to which the present invention is applied determines whether the foam exists by using the change in the rotational speed of the rotating drum 3 (see S12). In the waveform as described above, the speed of the rotating drum 3 is checked at predetermined time intervals, and the number of times of increasing the speed of the rotating drum 3 by more than 50 rpm is greater than or equal to 50 rpm. Is given a weight to count. Thereafter, if the counted number is greater than the reference number, it may be determined that bubbles exist. If the counted number is less than the reference number, it may be determined that bubbles do not exist.

On the other hand, according to another embodiment of the present invention, the number of times the speed of the rotating drum 3 increases above the first speed (V1) greater than 50rpm, or decreases below the second speed (V2) smaller than 50rpm When the counted number is greater than the reference number of times, the bubble is determined to be present. If the counted number is less than the reference number, the bubble is not present.

At this time, if it is determined that there is foam in the above operation, the motor is stopped and foam removal is performed (see S13).

On the other hand, if it is determined that there is no foam in step S12, the laundry is rotated at a predetermined time at 100 rpm in the same manner as in the prior art so that the laundry is spread evenly inside the rotating drum 3 to balance the rotating drum 3. Balancing is achieved (see S14).

At this time, during the balancing operation, the amount of eccentricity of the rotating drum 3 is measured to determine whether the measured eccentricity is smaller than the reference eccentricity (see S15). Perform the operation again.

In addition, when it is determined in step S15 that the measurement amount of eccentricity is smaller than the reference eccentricity, intermittent dehydration is performed for a predetermined time (see S16), and the normal dehydration is performed by accelerating the rotational speed of the rotating drum 3 to 450 rpm. (See S17)

The dehydration operation method of the drum washing machine according to the present invention as described above can shorten the time required in the inflating and balancing operation by detecting and removing bubbles in the inflating operation, and accelerate the acceleration time during normal dehydration. By reducing the speed up to the desired rotation speed is effective to improve the dehydration efficiency.

In addition, the present invention has the effect of improving the reliability of the detection result by detecting the foam by using the amount of change in the rotational speed of the rotating drum during the inflating operation, thereby improving the washing efficiency of the laundry.

Claims (3)

After the washing mode is finished, the first step of performing the inflated to eliminate the tangling of the laundry by rotating the rotating drum at a first speed; A second step of determining whether a bubble exists by using a change in rotational speed of the motor while the first step is performed, and stopping the motor and removing the bubble if the bubble exists; A third step of determining whether the measurement eccentricity is smaller than the reference eccentricity after performing balancing when it is determined that no bubbles exist in the second step; And If the amount of eccentricity is greater than the reference eccentricity in the third process, the process returns to the first process. If the amount of eccentricity is less than the reference eccentricity in the third process, the intermittent dehydration is performed for a predetermined time and then the rotation speed is maintained at the second speed or more. And a fourth process of performing normal dehydration while the dehydration operation method of the drum washing machine comprises a. The method of claim 1, The second process checks the speed of the rotating drum at predetermined time intervals, and counts the number of times the identified speed is greater than or equal to the third speed greater than the first speed, but is continuously identified as the third speed or more. A first step of counting by giving a weight; And And a second step of determining that bubbles exist if the number of times counted in the first step is greater than the reference number, and determining that no bubbles exist if the number of times counted in the first step is less than the reference number. Dehydration operation of the washing machine. The method of claim 1, The second process may include: a first step of counting the number of times that the speed of the rotating drum increases above a third speed greater than the first speed or decreases below a fourth speed smaller than the first speed; And And a second step of determining that bubbles exist if the number of times counted in the first step is greater than the reference number, and determining that no bubbles exist if the number of times counted in the first step is less than the reference number. Dehydration operation of the washing machine.