KR101073500B1 - Drum Type Washing Machine - Google Patents

Abstract

The present invention includes a control unit for controlling the operation of wrapping the drum inner surface by recognizing the position of the laundry on the basis of the drum rotation angle sensed by the rotation angle detection means. The control unit can reduce the amount of unbalance generated during the wrapping process and quickly complete the wrapping by adding acceleration when the laundry passes the peak, thereby reducing the total dehydration time. In addition, the size of the slope to increase the drum rotation speed can be reduced than before, thereby reducing the burden of increasing the frequency of control operation and setting the motor input power large.

Description

Drum Washing Machine {Drum Type Washing Machine}

1 is a view showing the speed of the drum when the winding machine in a general drum washing machine.

2 is a cross-sectional view of the drum washing machine according to the present invention.

3 is a control block diagram of a drum washing machine according to the present invention.

Figure 4 is a view showing the movement of the laundry inside the drum when the winding according to the present invention.

5 is a graph illustrating an output signal of an encoder according to the present invention.

6 and 7 are diagrams illustrating the rotational speed of the drum when the drum washing machine is wound in the drum washing machine of the present invention. FIG. 6 illustrates an example in which a predetermined slope is applied, and FIG. 7 illustrates an example in which the square root of the predetermined slope is applied.

Description of the Related Art [0002]

2: tank

3: drum

5: motor

The present invention relates to a drum washing machine, and more particularly, to a drum washing machine that can reduce the unbalance amount of cloth generated during the preliminary dehydration process.

In general, a drum washing machine is a device for putting detergent, washing water, and laundry into a drum, and driving the drum motor to perform washing by using a friction force between the drum and the laundry. Knock and rub can have a washing effect.

The inner circumferential surface of the drum washing machine is provided with a lifter formed in a long direction in the rotational axis direction. The lifter lifts the laundry in the rotational direction while the drum rotates and causes the laundry to fall by its own weight when the laundry reaches the upper side.

The drum rotates at high speed when the laundry is dewatered. At this time, if the laundry is unevenly distributed on the inner surface of the drum and unbalanced, the unbalance of the cloth becomes large, causing vibration and noise when dewatering. For this reason, a pre-dehydration process is carried out before the dewatering process enters the fabric winding process in which the fabric is brought into close contact with the inner surface of the drum.

When the conventional drum washing machine performs the cloth winding process, as shown in FIG. 1, the drum's rotational speed is gradually increased with a predetermined slope D1 to wind the cloth around the drum's inner surface. During the winding of the cloth, the unbalance amount of the cloth is detected and if the unbalance amount is larger than the reference value, the cloth winding process is repeated from the beginning. As the preliminary dehydration process becomes longer, the time for entering the main dehydration is delayed, so that the total dehydration time is longer.

The present invention is to solve the above problems, an object of the present invention is to provide a drum washing machine to reduce the unbalance amount of cloth generated in the process of wrapping the drum inner surface.

Drum washing machine according to the present invention for achieving the above object, a drum for receiving laundry, a rotation angle detection means for detecting the rotation angle of the drum, a drum motor for rotating the drum, a motor for driving the drum motor The drum motor is driven through a driving unit and the motor driving unit to linearly increase the rotational speed of the drum, and while the rotational speed of the drum is linearly increased, the rotational angle of the drum through the rotational angle sensing means. And a controller configured to temporarily accelerate the drum when the detected rotation angle reaches a preset value.
The preset value may include a position value when a lifter provided to carry the laundry on the drum inner circumferential surface reaches a preset position.
In addition, the predetermined position includes a predetermined range including a vertex in the drum.
The rotation angle detecting means may include an encoder for outputting a predetermined pulse signal corresponding to the position of the lifter.

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

In the drum washing machine according to the present invention, as illustrated in FIG. 2, a water tank 2 in which washing water is contained is provided in a housing 1 that is substantially box-shaped and forms an appearance. The drum 3 inside the water tank 2 is rotatably installed, and the drum motor 5 rotates the drum to wash the laundry. The drum motor 5 includes a stator 5a and a rotor 5b.

Openings 2a and 3a are provided at the front of the water tank 2 and the drum 3, and the door 6 for opening and closing the openings 2a and 3a is hinged at the front of the housing.

At the top of the housing, a water supply pipe (7) for receiving washing water from the outside and a detergent container (8) for mixing the detergent with the wash water supplied through the water supply pipe are installed on the bottom of the housing. A drain pump 9 and a drain hose 10 for discharging the wash water are installed.

The drum 3 is disposed in an inclined state upward toward the front of the housing, and the tank is disposed in an inclined state upward in the same angle as the drum.

A plurality of lifters (11) (12) (13) are arranged in the drum spaced apart at regular intervals so that the laundry is washed by pulling the laundry upward and dropping it at a predetermined height as the drum rotates.                     

As shown in FIG. 3, the drum washing machine according to the present invention includes a controller 20 for controlling the overall operation including a preliminary dehydration process for wrapping the cloth on the drum inner surface.

The controller 20 drives the drum motor 5 by controlling the motor driver 22 according to a user input command through the input unit 21. Accordingly, the motor driving force is transmitted to the drum to drive the drum 3 at a predetermined speed. Rotate

The speed sensor 23 senses the rotational speed of the motor and provides it to the controller 20.

The operation of the drum washing machine according to the present invention will be described.

When the user inputs a dewatering command through the input unit 21 or automatically performs a dehydration stroke as a series of washing processes, a winding process of winding laundry to the drum inner surface prior to the dehydration is performed.

Referring to FIG. 4, the drum 3 rotates clockwise R for the winding. The rotational speed of the drum is to be gradually increased according to the predetermined slope (D1). As the drum rotates, the encoder 24 inputs a predetermined pulse signal to the controller 20 as shown in FIG. 5.

When the lifter 11 reaches the set position B, the encoder 24 outputs a reference pulse signal of a large magnitude M1, so that the controller 20 adjusts the position of the laundry carried by the lifter 11. Recognize. That is, the position of the laundry carried by the lifter 11 corresponds to the first set angle P1 of FIG. 6, in which the controller 20 temporarily increases the rotational speed of the drum temporarily. In addition to the centrifugal force (F1) and gravity (F2) to the laundry, the acceleration force (F3) by the lifter 11 is applied. When the acceleration force (F3) is applied to the laundry near the apex, the adhesion between the drum inner surface and the laundry increases, thereby overcoming the gravity trying to fall off the drum and sticking to the drum inner surface. After the laundry has passed the peak, the controller increases the drum rotation speed by a predetermined slope D1 as in the beginning.

Whenever the following lifter 12, 13 reaches the set position B, i.e., when the drum rotation angle is the second set angle P2 and the third set angle P3, the controller 20 lifts 12 The rotational speed of the drum is temporarily sharply increased in order to add the acceleration force F3 to the laundry carried by). Repeat this procedure for each revolution of the drum.

As the laundry carried by the lifter passes the peak, the acceleration force is added to the centrifugal force, thereby increasing the adhesive force with the drum inner surface, so that the laundry is evenly wound on the drum inner surface. Therefore, the imbalance amount generated during the preliminary dehydration process can be suppressed, and the dewatering process is quickly completed before entering this dehydration.

On the other hand, when the rotational speed of the drum increases linearly, when the high rotational speed is reached, the frequency of the control operation performed by the controller to control the drum motor becomes faster, and as the rotational inertia of the motor and the drum increases, Input power also has to be high.

Since the present invention applies a method of increasing the adhesion between the drum inner surface and the laundry by adding an acceleration force to the laundry in the vicinity of the apex, it is possible to reduce the size of the inclination in a range that does not adversely affect the winding of the cloth, such as in FIG. As can be seen, even if the square root (D2) of the slope (D1) is applied.

According to the present invention as described above, by adding an acceleration force when the laundry passes the peak, it is possible to reduce the amount of imbalance generated in the wrapping process and to quickly wrap the wrapping to reduce the overall dehydration time. In addition, the size of the slope to increase the drum rotation speed can be reduced than before, thereby reducing the burden of increasing the frequency of control operation and setting the motor input power large.

Claims (7)

A drum for receiving laundry; Rotation angle detecting means for detecting a rotation angle of the drum; A drum motor for rotating the drum; A motor driver for driving the drum motor; And The drum motor is driven through the motor driving unit to linearly increase the rotational speed of the drum, and detect the rotational angle of the drum through the rotational angle sensing means while the rotational speed of the drum is linearly increased. And a controller for temporarily accelerating the drum when the sensed rotation angle reaches a preset value. delete The method of claim 1, And the preset value is a position value when the lifter provided to carry the laundry on the drum inner circumferential surface reaches a preset position. The method of claim 3, And the predetermined position is within a predetermined range including a vertex in the drum. delete delete The method of claim 3, The rotation angle detecting means is a drum washing machine comprising an encoder for outputting a predetermined pulse signal corresponding to the position of the lifter.

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