RU2503758C2 - Control method of machine for laundry treatment - Google Patents

Abstract

FIELD: textiles, paper.

SUBSTANCE: control method of a machine for laundry treatment is proposed which is equipped with the drive unit, an attachment lug connected to the drive unit, and a rear sealing gasket for prevention of leakage of wash water from the gap between the drive unit and the tank, and providing movement of the drive unit relative to the tank. According to one version of the control method the following is carried out: a stage of supplying water, carried out with the ability to actuate the drum to rubbing motion when supplying water to the tank; a circulation stage, carried out with the ability to ensure the circulation of water inside the tank for re-supplying water to the tank, which is carried out simultaneously with the beginning of the stage of supplying water. According to another version of the method the following is carried out: washing cycle comprising at least one stage of water supply carried out with the ability to actuate the drum to motion during a predetermined period of time after the beginning of supplying water to the tank, or after the water level reaches a predetermined value; a circulation stage, carried out with the ability to ensure the circulation of water inside the tank for re-supplying water to the tank, which is carried out at the stage of supplying water.

EFFECT: improvement of the control method.

9 cl, 9 dwg

Description

Technical field

The present invention relates to a method for controlling a laundry machine.

BACKGROUND OF THE INVENTION

Basically, a washing machine may include washing, rinsing, and spinning cycles. However, the known laundry machine has disadvantages.

Disclosure of invention

Technical problem

Thus, the present invention relates to a method for controlling a laundry machine.

Solution

To solve the problems, the object of the present invention is to provide a method for controlling a laundry machine including a water supplying step adapted to bring a drum into the rubbing movement when water is supplied to the tank.

Favorable Results of the Invention

The present invention has the following favorable results.

According to the control method of the present invention described above, it is possible to provide control for a highly efficient washing cycle.

Brief Description of the Drawings

The accompanying drawings, which are included to provide a better understanding of the present disclosure and form part of this application, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principle of the present disclosure.

In the drawings

Figure 1 is a sectional view of a typical laundry machine, as embodied and broadly described herein;

figure 2 is a perspective view with a spatial separation of the elements of the machine for processing sheets in accordance with the second embodiment, which uses a method of controlling a fast rotation cycle;

figure 3 is a view in section of a connected state in figure 2;

4 shows various drum movements and laundry paths, as embodied and broadly described herein;

5 is a curve showing the temperature of the water and the actuation of the circulation pump during the washing cycle;

6 and 7 are curves showing the change in revolutions per minute during the rapid rotation cycle;

Fig.8 is a curve showing the dependence of the mass on the natural frequency; and

Fig.9 is a curve showing the vibration characteristics of the machine for processing linen.

Best Mode for Carrying Out the Invention

Below, a method for controlling a laundry machine in accordance with the present invention will be described with reference to the accompanying drawings. Laundry processing machines in accordance with various embodiments in which the control methods of the present invention can be used will first be described with respect to the respective drawings, and then control methods will be described.

1 is a schematic view of a laundry machine in accordance with a first embodiment of the present invention, in which control methods in accordance with various embodiments can be used.

Referring to FIG. 1, a laundry machine 100 in accordance with a first embodiment of the present invention includes a housing 10 configured to form its appearance, a tub 20 located in the housing 10 for containing wash water, and a rotary drum 30 located in the tank 20.

The casing 10 determines the appearance of the machine 100 for processing sheets, and structural elements, which will be described below, can be installed in the casing 10. The door 11 is connected to the front panel of the casing 10, and the user opens the door 11 for loading linen into the casing 10.

The tank 20 is located in the casing 10, and it contains water for washing. The drum 30 can rotate in the tank 20, and it holds the laundry. In this case, a plurality of protrusions 31 may be formed in the drum 30, and they raise and lower the laundry to do the washing.

The tub 20 is supported by a spring located behind the tub 20. The electric motor 40 is mounted on the rear surface of the tub 20, and the electric motor 40 rotates the drum 30. When vibrating by the drum rotated by the electric motor 40, the tub 20 located in the laundry machine according to the first embodiment vibrates in conjunction with the drum. If the drum 30 rotates, the vibration created in the drum and the tank 20 can be damped by the damper 60 located under the tank 20.

As shown in FIG. 1, the tank 20 and the drum 30 may be parallel to the base of the casing 10. Alternatively, although not shown, the rear portions of the tank 20 and the drum 30 may be tilted down. The reason is that the front sections of the tank 20 and the drum 30 are more inclined at an angle up if the user loads the laundry into the drum 30. The ball counterweight 70 is located on the front surface and / or the rear surface of the drum 30 to balance the vibration of the drum 30, in if the drum rotates, especially, the drum rotates at a high speed, for example during a fast rotation cycle for drying. The ball counterweight will be described in detail below.

According to a laundry machine in accordance with an embodiment, the tub may be fixedly supported in the casing, or it may be supported by a flexible supporting structure, such as a suspension assembly, which will be described later. In addition, maintaining the tank may be between maintaining the suspension assembly and fully stationary support.

That is, the tank may be flexibly supported by the suspension assembly, which will be described later, or it may be supported completely stationary to move more rigidly. Although not shown in the drawings, the casing may be made different from the embodiments that will be described below. For example, in the case of an integrated laundry treating machine, the predetermined space into which the laundry treating machine will be installed may be formed by a wall structure or the like instead of a casing. In other words, the integrated laundry machine may not include a casing configured to independently form its appearance.

Figure 2 is a perspective view with a spatial separation of the elements of the machine for processing sheets in accordance with the second embodiment, and Figure 3 is a sectional view showing the assembled state in figure 2.

Referring to FIGS. 2 and 3, a laundry machine in accordance with this embodiment includes a tub 12 fixedly supported in a casing. The tank 12 may include a front side 100 of the tank, configured to form its front part, and a rear side 120 of the tank, configured to form its rear part. The front side 100 of the tank and the rear side 120 of the tank are assembled with each other using screws, and a predetermined space is formed in the assembled structure to accommodate the drum. The rear side 120 of the tank contains an opening formed on its rear surface, and the inner periphery of the rear surface of the rear side 120 of the tank is connected to the outer periphery of the rear gasket 250. The inner periphery of the rear gasket 250 is connected to the rear plate 130 of the tank. The back plate 130 of the tank contains a through hole formed in its center, and the shaft passes through the through hole. The rear gasket 250 may be made of flexible material so as not to transmit the vibration of the back plate 130 of the tank to the rear side 120 of the tank.

The rear side 120 of the tank includes a rear surface 128. The rear surface 128 of the rear side 120 of the tank, the rear plate 130 of the tank and the rear gasket 250 form the rear wall of the tank. The rear gasket 250 is sealed to the rear plate 130 of the tank and the rear side 120 of the tank, and it prevents leakage of washing water contained in the tank. The back plate 130 of the tank vibrates with the drum during rotation of the drum. As a consequence, the back plate 130 of the tank is at a predetermined distance sufficient not to collide with the rear side 120 of the tank. Since it is made of flexible material, the rear gasket 250 provides relative movement of the rear plate 130 of the tank without collision with the rear side 120 of the tank. The rear gasket 250 may include a corrugated portion 252 sufficiently stretched to allow such relative movement of the back plate 130 of the tank.

The foreign substance entry member 200 is connected to a front portion of the front side 100 of the tank to prevent foreign matter from entering between the tank and the drum. The element 200 for preventing the penetration of foreign substances is made of flexible material and is fixedly mounted on the front side 100 of the tank. The foreign material entry member 200 may be made of the same material as that used to make the rear gasket 250, and it will be called the front gasket for convenience.

Drum 32 includes a drum front 300, a drum center 320 and a drum rear 340. Ball balances 310 and 330 are mounted on the front and rear portions of the drum, respectively. The rear portion 340 of the drum is connected to the cross-shaped member 350, and the cross-shaped member 350 is connected to the shaft 351. The drum 32 rotates in the tub 12 under the action of a rotational force transmitted through the shaft 351 from the electric motor.

The shaft 351 is directly connected to the electric motor 170 by passing through the back plate 130 of the tank. Specifically, the shaft 351 is directly connected to the rotor 174 included in the electric motor 170. The bearing housing 400 is connected to the rear surface of the back plate 130 of the tank, and the bearing housing 400 is located between the electric motor 170 and the rear plate 130 of the tank to rotatably support the shaft 351.

The stator 172 is fixedly mounted on the bearing housing 400, and the rotor 174 is located around the stator 172. As mentioned above, the rotor 174 is directly connected to the shaft 351. The electric motor 170 is an electric motor with an external rotor and directly connected to the shaft 351.

The bearing housing 400 is supported by the suspension assembly relative to the base 600 of the casing, and the suspension assembly 18 includes three perpendicular support suspensions and two inclined support suspensions configured to support the bearing housing 400 at an angle forward and backward.

Suspension assembly 180 may include a first cylinder spring 520, a second cylinder spring 510, a third cylinder spring 500, a first cylinder damper 540 and a second cylinder damper 530.

A first cylinder spring 520 is located between the first suspension bracket 450 and the casing base 600, and a second cylinder spring 510 is located between the second suspension bracket 440 and the casing base 600.

A third cylinder spring 500 is directly connected between the bearing housing 400 and the housing base 600.

The first cylinder damper 540 is mounted at an angle between the first suspension bracket 450 and the rear portion of the casing base. The second cylinder damper 530 is mounted at an angle between the second suspension bracket 440 and the rear portion of the casing base.

The springs 520, 510 and 500 of the cylinder of the suspension assembly 180 can be coupled resiliently enough to the base 600 of the casing to allow the drum to move forward and backward and left and right, not fixedly connected to the base of the casing. That is, cylinder springs 520, 510 and 500 resiliently support the drum to allow the drum to rotate in the vertical and horizontal directions relative to the connection point with the base of the casing.

The perpendicular pendants of the suspension unit resiliently dampen the vibration of the drum, and the inclined pendants reduce the vibration. That is, outside a vibration system including springs and damping means, perpendicularly mounted suspensions are used as springs, and inclinedly mounted suspensions are used as damping means.

The front side 100 of the tank and the rear side 120 of the tank are fixedly mounted in the casing 110, and the vibration of the drum 32 is supported with the possibility of damping node 180 of the suspension. As such, the structure of the tub 12 and the drum 32 may be separate. Even when the drum 32 vibrates, the tub 12 may not vibrate.

The bearing housing 400 and the suspension brackets are connected to each other by the first and second weights 431 and 430.

A water supply pipe 722 is located in the casing 110, and a water supply pipe 722 is connected to an external water supply source, such as a water tap. The control unit performs on-off control of the water supply valve 720 for supplying water to the tank 12 through the pipe 722 for water supply. The end of the water supply pipe 722 is connected to the front of the tank 12 or the front gasket 200 for supplying water to the tank from the front. In the event that the detergent tray 710 is located along the water supply pipe 722, water may be supplied together with the detergent.

The circulation pump 730 may be located under the tank 12, and the circulation pump 730 circulates the water leaving the tank 12 for re-supplying it to the tank. If it is necessary that the water is circulated by the circulation pump 730 in the laundry machine according to the second embodiment, the valve 732 is controlled and the circulation pump 730 is connected to the circulation pipe 744. The end of the circulation pipe is connected to the front of the tank or the front gasket 200 to supply water to the tank from the front. If it is necessary to drain the water from the tank 12, the circulation pump 730 is connected to a drain pipe 742 to drain the water. Although not shown in the drawings, a circulation pump configured to circulate water and a sump pump configured to discharge water may be located separately. In this case, the circulation pipe and the drain pipe are connected respectively to the circulation pump and the sump pump.

The tank 12 and the drum 32 can be mounted parallel to the base 600 of the casing or obliquely at a predetermined angle to the base 600 of the casing. In this case, the rear portions of the tub 12 and the drum 32 can be tilted down so that the user more uniformly loads the laundry into the drum 32.

If the laundry 1 is housed in the drum 30 and 32, and the drum 30 and 32 rotates in the laundry machine in accordance with the above embodiments, strong noise and vibration would occur depending on the location of the laundry 1. For example, when the drum 30 and 32 s rotate laundry not distributed evenly in the drum 30 and 32 (hereinafter referred to as “eccentric rotation”), strong vibration and noise may occur. Especially when the drum 30 and 32 are rotated at high speed during a fast spin cycle for drying, vibration and noise will become a problem.

As a result, the laundry machine may include a ball counterweight 70, 310 and 330 to prevent vibration and noise generated by the eccentric rotation of the drum 30 and 32. The ball counterweight 70, 310 and 330 may be located in the front section or the rear section or in each of the front and back sections.

A ball counterweight 70, 310 and 330 is mounted on the rotary drum 30 and 32 to reduce eccentricity. As a result, the ball counterweight 70, 310 and 330 may have a center of mass that is capable of moving. That is, the ball counterweight (70, 310 and 330) may include a ball 72, 312 and 332 having a predetermined weight and a path along which the ball moves in a circumferential direction.

Specifically, the ball rotates due to the frictional force generated by the rotation of the drum 30 and 32. When the drum rotates, the ball is not held on the drum, and it rotates at a speed different from the speed of the drum. In this document, the eccentricity laundry is in direct contact with the inner wall of the drum, and it can rotate at almost the same speed as the drum due to sufficient friction and protrusion on the inner wall. As a result, the rotation speed of the laundry is different from the rotation speed of the ball. The speed of rotation of the laundry is higher than the speed of rotation of the ball at the initial stage of rotation of the drum having a relatively low speed. Specifically, the angular velocity of the laundry is higher than the angular velocity of the ball. In addition, the phase difference between the ball and the laundry, that is, the phase difference relative to the center of rotation of the drum can be continuously changed.

If the rotation speed of the drum becomes higher, the ball will be in direct contact with the outer peripheral surface of the channel for movement due to centrifugal force. At the same time, the ball is precisely set in a position in which the phase difference between the ball and the laundry is approximately 90-180 °. If the rotation speed of the drum is a predetermined value or more, the centrifugal force becomes large enough compared to the friction force between the peripheral surface and the ball to become a predetermined value or more, so that the ball can rotate at the same speed as the drum. In this case, the ball rotates at the same speed as the drum, while maintaining a position in which the phase difference with the laundry is 90-180 °, preferably approximately 180 °. In this description, the case of a ball rotating in a predetermined position relative to the drum will be referred to as an “eccentric position” or “balanced ball” for convenience.

As a result, when the load of the laundry is concentrated on a predetermined area inside the drum 30 and 32, the ball located in the ball counterweight 70, 310 and 330 is moved to a position corresponding to the eccentricity to reduce the eccentricity.

The drum may be driven in various ways in the aforementioned laundry machine. That is, the movement of the drum can be appropriately determined in accordance with each of the washing, rinsing and rapid rotation cycles for drying, or the user can appropriately determine the movement of the drum in accordance with the characteristics of the selected mode. Various motions applicable to the control method in accordance with the present invention will be described in detail below.

4 is a schematic view showing various movements of the drum. 4 is a front view schematically showing a drum for showing rotation of the drum. In accordance with FIG. 4, the inside of the drum is divided into four parts in a counterclockwise direction, and these four parts are defined as first, second, third and fourth quadrants to explain the location of the laundry in accordance with the rotation angle of the drum.

Referring to FIG. 4, drum movements may be embodied by a combination of a rotation direction, a rotation speed and a rotation angle of the drum. In addition, the laundry located in the inside of the drum may have a different falling direction, a falling point, and an impact load when dropped due to drum movements. Broadly, it is possible to obtain different movement of the laundry inside the drum. Various movements of the drum can be carried out by controlling an electric motor configured to rotate the drum.

When the drum rotates, the laundry rises by means of a protrusion (31, see FIG. 1, and 132, see FIG. 3) formed on the inner peripheral surface of the drum. As a result of this, the rotation speed, the direction of rotation, and the rotation angle of the drum are adjustable, and the shock load applied to the laundry may vary accordingly. That is, the mechanical force exerted on the laundry, such as the frictional force created between the laundry, the frictional force created between the laundry and water, and the shock due to the falling of the laundry, can vary, and the degree of impact or friction can vary accordingly. In addition, the rotation speed, the direction of rotation and the rotation angle of the drum can be adjusted, and the degree of distribution of linen or overturning inside the drum, respectively, can vary.

As a result, the control method of the laundry machine can provide various drum movements, and the drum movements are changed in accordance with each of the cycles and the particular step included in the cycle, so that the optimum mechanical force can be used to process the laundry. As a result, the washing efficiency of the laundry can be improved, and the time required for the optimum movement of the drum can be reduced.

The electric motor can be divided into a direct type connected directly to the drum shaft, and a distant type configured to transmit rotational force to the drum through a pulley or the like. To perform various movements of the drum, the electric motor 170 may be a direct type connected directly to the drum. In the case of the direction of rotation and torque of the electric motor, a time delay or a standstill can be prevented, and the movement of the electric motor can spontaneously be transmitted to the drum in the direct type.

Drum movements include rolling motion, tilting motion, step motion, oscillatory motion, rubbing motion, and the like. Below, each of the movements will be described in detail.

FIG. 4 (a) is a schematic view of a rolling motion, and each of FIG. 4 shows a rotation direction and a rotation angle of the drum, as well as moving laundry within the drum to explain each of the movements.

Referring to FIG. 4 (a), when rolling, the electric motor 40 and 170 continuously rotates the drum 30 and 32 in a predetermined direction, and the laundry located on the inner peripheral surface of the drum rotating in the direction of rotation of the drum falls to the lowest point of the drum from the position at an angle of approximately less than 90 °.

That is, when the electric motor 40 and 170 rotates at approximately 35-45 rpm, the laundry located at the lowest point of the drum 30 and 32 rises to a predetermined height in the direction of rotation of the drum 30 and 32, and then it moves by rolling to the lowest point of the drum from a position less than 90 ° relative to the lowest point of the drum. If the drum rotates in a clockwise direction, the laundry moves continuously in the third quadrant of the drum. The laundry is washed off due to the friction force with water, the friction force between it and the friction force with the inner peripheral surface of the drum during rolling movement. The rolling movement ensures that the laundry is turned over enough to create a wash effect similar to soft friction.

The revolutions per minute of the drum during the movement of the drum are determined depending on the centrifugal force if the drum rotates. That is, the more revolutions per minute, the greater centrifugal force is created in the laundry inside the drum. If centrifugal force is greater than gravity, the laundry will mesh with the inner peripheral surface of the drum. If the centrifugal force is less than gravity, the laundry may fall on the lower surface of the drum. As a result, the movement of the laundry inside the drum may vary due to the relative magnitude between centrifugal force and gravity. When determining drum revolutions per minute, you may have to consider the rotational force of the drum and the friction force between the drum and the laundry.

The revolutions per minute of the drum are determined in order to make centrifugal force less than gravity with the aforementioned rolling motion. That is, the laundry falls during rolling due to rotation of the drum during the rolling movement, and therefore, the centrifugal force must be less than gravity.

4 (b) is a schematic view showing a tumbling motion.

Referring to FIG. 4 (b), upon tipping movement, the electric motor 40 and 170 continuously rotates the drum 30 and 32 in a predetermined direction, and the laundry located on the inner peripheral surface of the drum falls to the lowest point of the drum from a position of approximately less than 90-110 ° relative to the direction of rotation of the drum.

In tipping motion, only if the drum is controlled to rotate at suitable rpm in a predetermined direction, a mechanical force is generated between the laundry and the drum. As a result of this, the tumbling motion is usually used for washing and rinsing.

That is, the laundry loaded in the drum 30 and 32 is located at the lowest point of the drum 30 and 32 until the electric motor 40 and 170 are driven. When the electric motor 40 and 170 transmits torque to the drum 30 and 32, the drum 30 and 32 rotates, and a protrusion 132 formed on the inner peripheral surface of the drum lifts the laundry to a predetermined height from the lowest point of the drum. If the electric motor 40 and 170 rotates the drum at about 46-50 rpm, the laundry will fall to the lowest point of the drum from a position of approximately 90-110 ° relative to the direction of rotation of the drum. In a tilting movement, the drum RPMs are determined so that the centrifugal force created by the tilting movement is greater than the centrifugal force created if the drum rotates and is less than gravity.

If the drum rotates in a clockwise direction during a tipping movement, the laundry rises to the second quadrant from the lowest point of the drum and then it falls to the lowest point of the drum. As a result, the tumbling motion launders the laundry due to the shock load created by the friction force with water and the shock load caused by the drop. With a tumbling motion, a large mechanical force, a large mechanical force of the rolling motion, can be used for washing and rinsing. In addition, the tumbling motion is a movement in which the laundry falls inside the drum, and this is effective in separating tangled laundry and evenly distributing the laundry.

4 (c) is a schematic view showing a step motion.

Referring to FIG. 4 (c), when stepping, the electric motor 40 and 170 rotates the drum 30 and 32 in a predetermined direction, and the laundry located on the inner peripheral surface of the drum is controlled to fall to the lowest point of the drum from the highest point of about 180 ° relative to the direction of rotation of the drum.

When the electric motor 40 and 170 rotates the drum 30 and 32 at approximately 60-77 rpm or more, the laundry can rotate by centrifugal force until it reaches the highest point of the drum without falling. When stepping, if the laundry reaches the highest point, sudden braking is applied to the drum to maximize the impact load applied to the laundry.

After rotating the drum 30 and 32 at a predetermined speed without dropping the laundry (approximately 60-70 rpm or more) until the laundry reaches the highest point of the drum by centrifugal force, the electric motor 40 and 170 are controlled to transmit reverse torque the drum 30 and 32, when the laundry is located near the highest point of the drum (180 ° relative to the direction of rotation of the drum). The laundry rises from the lowest point of the drum in the direction of rotation of the drum. After that, when the drum instantly stops under the influence of the reverse torque of the electric motor, the laundry falls from the highest point to the lowest point of the drum 30 and 32. As a result, the stepwise movement provides washing of the laundry due to the shock load created when the laundry falls from the maximum height. The mechanical force created by this step motion is greater than the mechanical force created by the rolling motion or tipping motion mentioned above.

In the event that such sudden braking is applied during the stepping motion, the electric motor 40 and 170 are braked in the reverse phase. Braking in the reverse phase is a type of motor braking caused by a torque created in the opposite direction with respect to the direction of rotation of the motor. The phase of the current supplied to the electric motor can be changed to create reverse torque, and the braking in the reverse phase makes it possible to apply sudden braking to the electric motor. As a result, braking in the reverse phase is the most suitable braking system for stepping, configured to apply a large shock load to the laundry.

According to FIG. 4 (c), in stepwise movement after successively moving to the highest point from the lowest point of the drum through the third and second quadrants, if the drum rotates, the laundry falls to the lowest point of the inner peripheral surface of the drum. Since the fall distance inside the drum is the largest when stepping, mechanical force can be applied to a small amount of laundry.

Therefore, the electric motor 40 and 170 reapplies the torque to the drum 30 and 32, the electric motor lifts the laundry located at the lowest point of the drum to the highest point in the same direction of rotation. That is, when the laundry reaches the highest point after applying a torque to rotate the drum in a clockwise direction, torque is applied to rotate the drum in a counterclockwise direction, and the drum immediately stops. After that, a torque is applied to the drum for repeated rotation in a clockwise direction, and stepwise movement is carried out. As a result, the step motion is the motion used to wash the laundry by the friction force between the water discharged through the through hole (134, see FIG. 3) formed in the drum and the laundry, and by the impact load created by the fall laundry when the laundry reaches the highest point of the drum.

4 (d) is a schematic view showing an oscillatory movement.

Referring to FIG. 4 (d), in oscillatory motion, the electric motor 40 and 170 alternately rotates the drum 30 and 32 in clockwise and counterclockwise directions, and the laundry falls into a position of approximately 90-130 ° relative to the direction of rotation of the drum.

That is, when the electric motor 40 and 170 rotates the drum 30 and 32 at approximately 40 rpm in a counterclockwise direction, the laundry located at the lowest point of the drum 30 and 32 rises to a predetermined height in a counterclockwise direction. After the laundry passes the 90 ° position with respect to the counterclockwise direction of the drum, the electric motor stops the rotation of the drum so that the laundry falls to the lowest point of the drum from the 90-130 ° position with respect to the counterclockwise direction of the drum.

Therefore, the electric motor 40 and 170 rotates the drum 30 and 32 at approximately 40 rpm in a clockwise direction to raise the laundry to a predetermined height in a clockwise direction along the direction of rotation of the drum. After the laundry passes through the 90 ° position with respect to the counterclockwise direction of the drum, the electric motor stops the rotation of the drum, and the laundry falls to the lowest point of the drum from the 90-130 ° position relative to the clockwise direction of the drum.

That is, an oscillatory movement in which rotation and stop relative to a given direction and rotation and stop relative to the opposite direction can be repeated. The laundry raised to a portion of the second quadrant of the third quadrant of the drum falls slowly, and it re-lifts to the portion of the first quadrant of the fourth quadrant of the drum to re-fall slowly. As a result, the laundry can be moved in an inverted “8” shape through the third and fourth quadrants of the drum during oscillatory motion.

In this case, the electric motor 40 and 170 can use rheostatic braking. According to rheostatic braking, if the current applied to the electric motor is turned off, the electric motor is used as an energy source due to inertia of rotation. If the current applied to the motor is turned off, the direction of the current passing through the motor winding will change to the opposite direction of the current until the power is turned off, and the force (Fleming’s right hand rule) is applied along the direction that prevents the motor from rotating to brake the motor. In contrast to braking in the reverse phase, rheostatic braking cannot cause rapid braking of the electric motor, but it can gradually change the direction of rotation of the drum. As a result, the oscillatory movement uses rheostatic braking, and the load applied to the electric motor 40 and 170 can be minimized. In addition, the mechanical wear of the electric motor 40 and 170 can be minimized, and at the same time, the impact load applied to the laundry can be adjusted.

4 (e) is a schematic view showing a rubbing movement.

Referring to FIG. 4 (e), when rubbing, the electric motor 40 and 170 alternately rotates the drum 30 and 32 in both clockwise and counterclockwise directions, and braking is applied to the drum in the reverse phase, so that the laundry can fall from a position of 130-160 ° relative to the direction of rotation of the drum.

That is, when the electric motor 40 and 170 rotates the drum 30 and 32 at approximately 60 rpm in a counterclockwise direction, the laundry located at the lowest point of the drum 30 and 32 rises to a predetermined height in a counterclockwise direction. After the laundry has passed a position of approximately 90 ° with respect to the counterclockwise direction of the drum, the electric motor applies reverse torque to the drum to temporarily stop the drum. Then, the laundry located on the inner peripheral surface of the drum will quickly fall.

Therefore, the electric motor 40 and 170 rotates the drum 30 and 32 at approximately 60 rpm in a clockwise direction to raise the dropped laundry to a predetermined height in a clockwise direction. After the laundry passes the 90 ° position with respect to the counterclockwise direction of the drum, the electric motor 40 and 170 applies a reverse torque to the drum 30 and 32, and the rotation of the drum is temporarily stopped. As a result, the laundry located on the inner peripheral surface of the drum falls to the lowest point of the drum from a position of approximately 130-160 ° with respect to the clockwise direction of the drum.

As a result, laundry can quickly fall from a predetermined washing height with rubbing movement. Therefore, the electric motor 40 and 170 can brake in the reverse phase to stop the drum.

With rubbing movement, the direction of rotation of the drum changes rapidly, and the laundry may not go much beyond the inner peripheral surface of the drum. As a result, a wash result similar to strong friction can be achieved with rubbing movement. With a rubbing movement, this is repeated so that the laundry moved to the part of the second quadrant through the third quadrant quickly falls to re-fall after moving to the part of the first quadrant through the fourth quadrant. As a result, during the rubbing movement, the lifted laundry falls repeatedly along the inner peripheral surface of the drum.

Figure 4 (f) is a schematic view showing movement during filtration. When moving during filtration, the electric motor 40 and 170 rotates the drum 30 and 32 so that the laundry does not fall from the inner peripheral surface of the drum and water is sprayed into the drum.

That is, when moving during filtration, while the laundry, after distribution, rotates in direct contact with the inner peripheral surface of the drum, water is sprayed into the drum. Water is discharged from the tub 120 from the laundry and the through hole 131 of the drum under the action of centrifugal force. Since the movement during filtration increases the surface area of the laundry, and it facilitates the passage of water through the laundry, washing water can pass through the laundry, and washing water can be uniformly supplied to the laundry.

4 (g) is a schematic view showing a compressive movement. In the compressive movement, the electric motor 40 and 170 rotates the drum 30 and 32 so that the laundry does not fall from the inner peripheral surface of the drum, and then the electric motor reduces the rotation speed of the drum 30 and 32 to separate the laundry from the inner peripheral surface of the drum. This process is repeated, and water is sprayed into the drum during rotation of the drum.

That is, the drum continuously rotates at a speed sufficient so that the laundry does not fall from the inner peripheral surface of the drum when moving during filtration. On the contrary, the rotation speed of the drum is changed to repeat the process of direct contact of the laundry with the inner peripheral surface and the separation of the laundry from the inner peripheral surface.

The process of spraying water into the drum 30 and 32 during movement during filtration and compressive movement can be carried out using a circulation channel and a pump, although not shown in FIG. The pump is in communication with the bottom surface of the tank 120, and it exerts pressure on the washing water. The end of the circulation channel is connected to the pump, and water is sprayed from the upper portion of the drum into the drum through the other end of the circulation channel.

The circulation channel and pump mentioned above are necessary elements in the case of spraying water contained in the tank, and the present invention may not exclude the case of spraying water through a channel connected to an external water supply source located on the outside of the casing.

5 is a schematic view showing more specifically the step motion. When the electric motor 40 and 170 applies torque to the drum 30 and 32 in a predetermined direction, the drum rotates in a predetermined direction, and the laundry rises in a state of direct contact with the inner peripheral surface of the drum. While the drum can rotate at approximately 60 rpm or more to lift the laundry in direct contact with the inner peripheral surface of the drum. In this document, the rotation speed of the drum is determined depending on the inner diameter of the drum, and a certain rotation speed may have centrifugal force greater than gravity.

Just before the laundry reaches the highest point of the drum, passing through a 90 ° position relative to the direction of rotation of the drum 30 and 32, the motor 40 and 170 are braked in the reverse phase to temporarily stop the rotation of the drum. The start of the braking time in the reverse phase relative to the electric motor 40 and 170 is directly related to the location of the laundry inside the drum. As a result of this, a device used to determine or guess the location of the laundry, and a measuring device including a Hall sensor configured to determine the rotation angle of the rotor, can be one example.

The control unit can determine the direction of rotation, as well as the angle of rotation of the rotor using the Hall sensor. This technical feature is well known to a person skilled in the art, and accordingly, a detailed description thereof will be omitted.

The control unit can determine the angle of rotation of the drum using a measuring device, and it controls the electric motor 40 and 170 for braking in the reverse phase, before the drum has an angle of rotation of 180 °. In this document, braking in the reverse phase means that reverse current is supplied to rotate the drum in the opposite direction. For example, after applying current to the electric motor to rotate the drum in a clockwise direction, a reverse current is quickly supplied to rotate the drum in a clockwise direction.

As a result, the drum rotated in a clockwise direction stops for a moment, and the rotation angle at this time is essentially 180 ° for the laundry to fall to the lowest point from the highest point of the drum. After that, current is continuously supplied to rotate the drum in a clockwise direction.

5 shows that the drum rotates in a clockwise direction. In this document, while the drum rotates in a counterclockwise direction, a step motion can be performed. In this document, the step motion creates a large load on the electric motor 40 and 170, and the net coefficient of operation in the step motion can be reduced.

The net work factor is the ratio of the motor run time to the total run time and the stop time of the motor 40 and 170. If the net run factor is “1”, this means that the motor runs without stop time. Step motion can be carried out at approximately 70% of the net work factor, taking into account the load of the electric motor. For example, an electric motor can be stopped for 4 seconds after operating for 10 seconds.

6 is a schematic view showing more specifically the rubbing movement. When the electric motor 40 and 170 applies torque to the drum 30 and 32, the laundry inside the drum rotates in a clockwise direction. In this document, the electric motor 40 and 170 may be controlled to rotate the drum 30 and 32 at approximately 60 rpm or more to rotate the laundry in direct contact with the inner peripheral surface of the drum. After that, when the laundry passes through a 90 ° position relative to the direction of rotation of the drum, the electric motor 40 and 170 performs braking in the reverse phase, and, accordingly, the laundry falls out of direct contact with the inner peripheral surface to the lowest point of the drum.

When the laundry falls to the lowest point, the electric motor 40 and 170 applies a torque to the drum to rotate the drum counterclockwise. As a result, the laundry rotates in a counterclockwise direction in direct contact with the inner peripheral surface of the drum. When the laundry is located between the 90 ° position in a counterclockwise direction and the highest point of the drum from the lowest point, the electric motor brakes in the reverse phase, and the linen falls directly into the lowest point of the drum from direct contact with the inner peripheral surface.

The rubbing movement described above creates a large load on the electric motor 40 and 170 like a step motion. As a result, the net coefficient of work in rubbing motion can be reduced. For example, the rubbing movement is carried out for 10 seconds, and after that it stops for four seconds, and this process is repeated so that the net work rate is 70%.

Although not shown in the drawings, the type of braking of the motor during rubbing movement becomes rheostatic braking during oscillatory motion. The reference time for rheostatic braking becomes the moment when the laundry reaches a position of 90 ° relative to the direction of rotation of the drum, and, accordingly, a detailed description of the oscillatory movement will be omitted.

Fig. 7 is a curve showing a comparison of the washing ability and the vibration level with each movement shown in Fig. 4. The horizontal axis indicates the washing ability, and it is easier to separate the dirt contained in the laundry when moving to the left. The vertical axis indicates the level of vibration or noise, and the level of vibration is higher when moving up, and the washing time of the same linen is reduced.

Stepping movement and rubbing movement are suitable for washing modes to reduce washing time when the laundry is heavily soiled. Stepping movement and rubbing movement have a high level of vibration / noise, and they are not suitable for washing modes, carried out for washing delicate fabrics and minimize noise and vibration.

The rolling movement has a good washing ability and low vibration with minimal damage to the laundry and low load on the electric motor. As a result, the rolling movement may be suitable for all washing modes, especially for dissolving the detergent in the initial washing step and wetting the laundry.

The tumbling motion has a low washing ability compared to the rubbing motion and an average level of vibration compared to the rubbing motion and the rolling motion. The rolling movement has a low vibration level, but it has a longer washing time than the tumbling movement. As a result, the tumbling motion can be applied in all washing modes, and it is suitable for the washing mode necessary for uniform distribution of the laundry.

The compressive movement has a washing ability similar to the tipping movement and a higher level of vibration compared to the tipping movement. The compressive movement repeats the process of direct contact of the laundry with the inner peripheral surface of the drum and separating the laundry from the inner peripheral surface of the drum, and in this process, washing water is discharged to the outside of the drum after passing through the laundry. As a result, the compressive movement is suitable for rinsing.

Filtration motion has a lower washing ability than compressive motion and a noise level similar to rolling motion. When moving during filtration, water passes through the laundry and is discharged from the drum with the laundry in direct contact with the inner peripheral surface of the drum. As a result, the movement during filtration is suitable for a regime that requires wetting of the laundry.

The vibrational movement has the lowest vibration and washing ability, and it is suitable for the low noise and low vibration washing mode and for the washing of delicate fabrics.

As mentioned above, each drum movement has advantages and disadvantages, and it is preferred that these various drum movements are used correctly. Each drum movement may have advantages and disadvantages regarding the amount of laundry. Even in the case of the same mode and cycle, different drum movements can be used properly with respect to the amount of laundry.

A method for controlling a laundry machine including drum movements described above will be described below. A laundry machine typically includes washing, rinsing and rapid rotation cycles for drying, and these cycles will be described. In this document, the wash cycle is part of various modes, or it can be carried out independently.

The washing cycle may include a water supplying step configured to supply water and detergent to the tub 12 and 20 or a drum 30 and 32 for dissolving the detergent in water. That is, the water and the detergent are dispensable for washing the laundry. In addition, the washing cycle may include a main washing step configured to drive the laundry drum. In this document, the water supplying step may be a preparatory step for the main washing step. As a result, it is preferable to increase the efficiency of the water supplying step to increase the efficiency of the washing cycle (including the washing efficiency and the efficiency of decreasing the time).

The washing cycle may include a laundry wetting step and / or a heating step carried out between the water supplying step and the main washing step. The control method to be described relates to the step of supplying water to the wash cycle, and will be described in detail.

The control unit supplies washing water to the tub 12 and 20 in the water supplying step. Specifically, the control unit opens the water supply valve 720 and supplies water to the tank 12, the water passing through the water supply pipe 722 and the detergent tray 710.

Since the detergent is supplied with water in the water supplying step, the detergent can be completely dissolved during the water supplying step to increase the efficiency of the washing cycle. As a result, at the water supplying stage, a predetermined process can be carried out to accelerate the dissolution of the detergent in water. If the water partially contacts the laundry during the water supply, the water does not evenly wet the laundry, and the efficiency of the washing cycle may be reduced. Although the step of wetting the laundry is provided in the washing cycle, the step of supplying water may include a process for uniformly wetting the laundry with water. Various embodiments of a method for accelerating the dissolution of a detergent and a method for uniformly wetting laundry will be described below.

First of all, to accelerate the dissolution of the detergent, the movement (movement of the drum) of the laundry inside the drum can exert a large mechanical force on the water and the laundry. As a result, step motion is preferable in the water supplying step to accelerate the dissolution of the detergent, since the laundry lifted along the rotary drum falls from the inner peripheral surface of the drum as a result of braking of the drum, and this is repeated in the step motion. The rubbing movement, in which the laundry raised along the rotating drum repeatedly falls and rises as a result of braking and rotation in the opposite direction of the drum, can be carried out at the stage of water supply. With step motion and rubbing movement, the drum quickly stops after rotation, and the direction of the laundry changes rapidly. As a result, these can be movements capable of applying a large shock load to the laundry and water, so that a large mechanical force can be provided at the initial stage of the water supply stage, and the dissolution of the detergent can be accelerated only to increase the efficiency of the washing cycle.

The dissolution of the detergent can be accelerated by repeating the sequential combination of stepping and rubbing movements. In this case, different types of drum movements are combined, and the type of laundry movement as well as the type of water flow may be different. As a result, the efficiency of the washing cycle can be further enhanced.

As mentioned above, the water supplying step is a preparatory step for the main washing step. As a consequence, the dissolution of the detergent and the wetting of the laundry should be carried out quickly and completely at the stage of water supply, and they should be carried out regardless of the amount of laundry. However, given the limited volume of the drum, a limited amount of water can be supplied to the drum, the movement of the drum in the water supplying step can be controlled in various ways according to the amount of laundry.

The step of determining the amount of laundry, configured to determine the amount of laundry placed in the drum, can be carried out before the stage of water supply. The movement of the drum in the water supplying step can be controlled in various ways in accordance with the result of the laundry amount determination step.

Such a determination of the amount of laundry can be carried out by measuring the current required to rotate the drum. For example, the currents necessary to effect a tumbling motion can be measured. In the event that the drum rotates, the amount of current applied by the control unit to effect the tumbling motion may differ in accordance with the amount of laundry, and the amount of laundry can be determined.

If the laundry amount determined in the laundry amount determination step is a predetermined amount of laundry or more, the detergent dissolution process may be controlled so as not to occur. That is, a process configured to accelerate the dissolution of the detergent can be controlled to be implemented if the laundry amount is a predetermined amount or less. The reason is that a drum movement capable of providing greater mechanical force is more efficient if the amount of laundry is small and a small amount of laundry can be effectively moistened with water. That is, a small amount of laundry means that the surface area of the laundry necessary for contact with water is small, and the dissolution of the detergent, as well as the wetting of the laundry, can be accomplished by the mechanical force used to turn the laundry over for a short time. As a result, the result of the main wash can be partially achieved by a step motion, and the result of the reduced time required to carry out the main wash can be expected.

In contrast, in the case of a large amount of laundry, the mechanical force may be insufficient, and the laundry may not be in sufficient contact with water. When the laundry is knocked into a pile, water is not supplied to objects inside the laundry that is knocked into the pile in sufficient quantities.

As a result, if the laundry amount is a predetermined amount or more, the process of accelerating the dissolution of the detergent is excluded, and the wetting step of the laundry may begin. When the laundry amount is a predetermined amount or more, it is more preferable that the laundry is in sufficient contact with water to accelerate the dissolution of the detergent. For this, the circulation step, configured to circulate the water contained in the tank for re-supplying it to the drum, can be carried out at the stage of water supply.

According to the laundry treating machine of the second embodiment described above, the tub 12 is directly mounted in the casing 110 and the drum 32 is located in the tub 12. Since only the drum 32 rotates in the laundry treating machine according to the second embodiment, the tub 12 installed stationary, it is important to prevent contact between the drum 32 and the tank 12 during rotation of the drum. As a result, the distance between the tub 12 and the drum can be formed larger in the laundry treating machine than in the known laundry treating machine.

If the distance between the tub 12 and the drum 32 is increased, the laundry inside the drum may not be wet enough during the supply of water to the tub. To ensure that the laundry is sufficiently wetted by the water supply, the laundry treating machine according to the second embodiment drives the circulation pump 730, and the water contained in the tub can circulate. For example, the circulation pump 730 can be continuously activated or at a predetermined interval, with the water supply valve open.

According to the laundry machine of the second embodiment, the drum 32 is connected to the back plate 130 of the tank. The back plate of the tub 130 is supported by the suspension unit 180 by the bearing housing 400, not the tub 12. As a result, compared with the drum 30 supported by the back plate 130 of the tub directly connected to the tub 12 in the laundry machine according to the first embodiment, a drum 32 located in the laundry machine according to the second embodiment, especially the front of the drum 32 has a greater degree of freedom.

If water is supplied to the tank 12, the water supply pipe 722 and the circulation pipe 744 supply water to the front section of the tank 12, and the laundry located on the front section of the drum may be wetted earlier. As a result, the load applied to the front portion of the drum 32 is greater than the load applied to the rear portion, and the front portion of the drum 32 may drop down. If the front section of the drum falls down, the noise and vibration generated during rotation of the drum will increase, and rather, that it will come into contact with the inner surface of the tub 12. As a result, it is necessary to supply water to the laundry machine in accordance with the second an embodiment, uniformly wet the laundry located in both the front and rear portions of the drum 32.

Below will be described a method for controlling the uniform wetting of laundry located in both the front and rear portions of the drum, in accordance with the variants of implementation of the present invention when supplying water to the machine for processing sheets in accordance with the second embodiment of the present invention.

In the event that water is supplied in the water supplying step in accordance with the control method of the first embodiment, the circulation pump 730 is driven to circulate the water, and the drum 32 is simultaneously driven. When the drum 32 is driven, the control unit controls the drum 32 to drive movement in accordance with the rubbing movement of the movements of the drum described above.

The distance between the drum 32 and the tub 12 in the laundry treating machine according to the second embodiment is greater than the distance between them in the known laundry treating machine. Because of this, when applying the tumbling motion for the drum 32 during the water supply as in the known machine for processing linen, the laundry located in the rear portion of the drum is not wetted enough. That is, since the gap between the drum 32 and the tub 12 is larger than the gap formed in the known laundry machine, the water located between the drum and the tub will not rise due to rotation of the drum without wetting the laundry located in the rear portion of the drum.

As a result, when the water supplying step is carried out in accordance with this control method, the rubbing movement is carried out instead of the tumbling movement. As mentioned above, the rubbing movement rotates the drum at higher revolutions per minute than the tumbling movement, and the water located between the drum 32 and the tub 12 rises due to the rotation of the drum 32 for falling onto the laundry.

Especially, the rear portions of the drum 32 and the tub 12 are inclined in the laundry machine in accordance with the second embodiment. As a result, the rubbing movement provides a uniform supply of water located in the rear portion of the tub 12 to the upper part of the laundry. In addition, the rubbing movement quickly changes the direction of rotation of the drum 32 into a clockwise direction and a counterclockwise direction. As a result, a whirlwind is created in the wash water by rapidly changing the direction of rotation applied to the drum, so that laundry located in the front and rear portions of the drum can be uniformly wetted.

When the water supply valve 720 is open for supplying water, the drum 32 is driven and rotated, and the laundry is moved inside the drum 32 in accordance with the driving of the drum 32. In this case, the water supplied through the water supply pipe 722 connected to the front of the tub 12 can be supplied mainly to moving laundry located in the front portion of the drum 32, and laundry located in the front portion becomes wet faster than laundry located in the rear portion of the drum 32.

Until a predetermined time has passed, after the water supply valve 720 delivers water or the water reaches a predetermined level, the control method according to the second embodiment may not drive the drum 32. If the drum 32 is not set in motion for a predetermined time, or until the water reaches a predetermined water level, the water supplied through the water supply pipe 722 can mainly be collected in the lower portion of the tank 12. In this document, the predetermined water level can be determined taking into account the distance between the tank 12 and the ba raban. The predetermined time can be determined in accordance with the volumes of the tank 12 and the drum 32, as well as with the amount of laundry.

Especially, the rear portion of the tub 12 in the laundry machine mentioned above is sloped downward, and a large amount of water is collected in the rear portion of the tub 12. When the drum 32 is rotated for a predetermined time, the laundry located in the rear portion of the drum 32 may be wet due to the water collected in the rear portion of the tank 12. When driving the drum 32 in accordance with the control method of the second embodiment, the movement of the drum can be carried out as a tumbling motion or a rubbing motion Nia.

If the water supply valve 720 is open to supply water in accordance with the second embodiment of the control method without driving the drum 32, the water supply valve 720 is controlled by the open-closed principle. That is, when the water supply valve 720 is open for supplying water, the water may have a predetermined pressure due to the water pressure of an external water supply source, such as a water tap. In this case, water supplied through the water supply pipe 722 can be supplied to the front portion of the drum under the influence of water pressure to wet the laundry located in the front portion of the drum.

As a result, when supplying water in the control method according to the second embodiment, the water supply valve 720 can repeatedly open and close, not remain open continuously. The water supply valve 720 may be controlled to open and close so that the supplied water has a predetermined pressure so that it does not directly pass into the drum 32. In this document, the water pressure so that the water does not pass directly into the drum may mean a water pressure allowing the water to flow through pipe 722 for supplying water along the drum, tank and door, and collect in the lower portion of the tank 12, so as not to spray into the drum under the influence of water pressure. Water falling along the drum, tank and door may collect in the rear portion of the tank 12, and the description thereafter is similar to the description mentioned above. Therefore, a duplicate description will be omitted.

When water is supplied in the water supplying step, the laundry may pile up and a partial amount of laundry may be wet. Especially, the laundry located in the center of the downed pile may not be wet, and only the laundry located in the outer portion of the downed pile can be wet. If only part of the laundry is wet, the washing will not be carried out evenly during the washing cycle, only reducing the washing efficiency. In the event that the laundry is knocked together, a control method according to the third embodiment will be described, configured to uniformly wet the knotted laundry.

The control unit opens the water supply valve 720 to supply water, and it drives a circulation pump 730 to simultaneously circulate water. The control unit may drive the drum 32 for movement during filtration.

That is, the control unit can control the drum for rotation at a given rpm. In this document, predetermined revolutions per minute are defined to be revolutions per minute, providing direct contact of the laundry with the inner wall of the drum, so that the laundry does not fall under the influence of gravity during rotation of the drum. As a result, predetermined revolutions per minute can be set so that the centrifugal force applied to the rotating drum is greater than the acceleration of gravity, and preset revolutions per minute can be set below the excessive interval of the laundry machine in which resonance is generated (approximately 200- 35 rpm), if the drum rotates at rpm higher than the excessive interval, the noise and vibration created due to resonance can be significantly increased. As a result, predetermined rpm can be set at approximately 100-170 rpm.

When the control unit rotates the drum 32 at a given rpm, the laundry is in direct contact with the inner wall of the drum 32 due to centrifugal force, and the water supplied through the circulation pipe 744 and the water supply pipe 722 is distributed in accordance with the rotation of the drum 32. Distributed water is supplied to the drum 32, so that the laundry can be evenly wetted.

Described are control methods configured to uniformly wet the laundry used in the laundry treating machine according to the second embodiment, and the present invention is not limited thereto. For example, control methods may be applicable to a laundry machine in accordance with a first embodiment.

One of the process of accelerating the dissolution of detergent and the process of uniformly wetting the laundry described above, or both can be carried out at the stage of water supply. Both of these two processes can be carried out sequentially or repeatedly, as well as sequentially or in reverse order, and various combinations of these two processes are possible.

Therefore, the control unit controls the drum for rotation in the step of wetting the laundry to wet the laundry. In case the water is not heated, a heating step may be carried out, with the possibility of heating the water using a heater located in the tank. After that, the control unit carries out the main washing step by simultaneously driving the drum 32 and the circulation pump 730. The drum movement in the main washing step can be selected from the drum movements in accordance with the mode selected by the user. The circulation pump 730 is driven at a predetermined interval, and the water contained in the tank 12 is circulated.

The drum in the drum type washing machine is visible from the outside through the door 11. Various movements of the drum can be performed during the washing cycle in accordance with an embodiment and a washing regime including a washing cycle. As a result, the user can see various drum movements carried out directly in the drum. That is, the type of washing with a soft impact (tipping motion), the type of washing with a strong impact (step motion), the type of washing with a soft rubbing effect (rolling motion) and the type of washing with a strong rubbing effect (rubbing motion) can be determined in visibility limits. As a result of this, the user can determine that washing is normal, and this can create an effect of increased user satisfaction, as well as an effect of substantially increased washing efficiency.

Fig. 8 is a curve showing mass versus natural frequency. Assume that in vibration systems of two laundry machines, two laundry machines have masses m0 and m1, respectively, and the maximum amounts of contained laundry are ∆m, respectively. Then the transition regions of the two laundry machines can be determined taking into account ∆nf0 and ∆nf1, respectively. In this case, the amount of water contained in the laundry will not be taken into account for a while.

Meanwhile, referring to FIG. 8, a laundry machine with a lower mass m1 has a transition region range greater than a laundry machine with a larger mass m0. That is, the range of the transition region having a vibration of the recorded amount of laundry becomes larger, the smaller the mass of the vibration system becomes.

The ranges of transition regions will be considered with respect to the prior art laundry machine and the laundry machine of this embodiment.

The prior art laundry machine has a structure in which vibration is actually transmitted from the drum to the tank, causing the tank to vibrate. Therefore, taking into account the vibration of the prior art laundry machine, a tank is necessary. However, usually the tank has not only its own weight, but also large weights in the front, back or on the peripheral surface to balance. Therefore, the prior art laundry machine has a large mass of vibration system.

In contrast, in the laundry machine of this embodiment, since the tank is not only not weighed but also separated from the drum due to the supporting structure, the tank may not be taken into account when considering the vibration of the drum. Therefore, the laundry machine of this embodiment may have a relatively small mass of vibration system.

Then, referring to FIG. 8, the prior art laundry machine has a mass m0, and the laundry machine of this embodiment has a mass m1, resulting in the laundry machine of this embodiment has a large transition region at the end.

In addition, if the amounts of water contained in the laundry are simply taken into account, Δm in FIG. 8 will become larger, making the difference in the ranges of the transition regions even larger. Since, in the prior art laundry machine, water flows into the tub from the drum, even if water is removed from the laundry when the drum rotates, a decrease in the mass of water that occurs as a result of rapid rotation is small. Since the laundry treating machine of this embodiment comprises a tub and a drum separated from each other in view of vibration, water exiting the drum immediately affects the vibration of the drum. That is, the effect of changing the mass of water in the laundry is greater in the laundry processing machine of this embodiment than in the prior art laundry processing machine.

According to the aforementioned reason, although the prior art laundry machine has a transition region of about 200 ~ 270 rpm, the initial revolutions per minute of the transition region of the laundry machine according to this embodiment may be similar to the initial revolutions per minute of the transition region famous machine for processing linen. The final revolutions per minute of the transition region of the laundry machine according to this embodiment can increase more than the revolutions per minute calculated by adding a value of approximately 30% of the initial revolutions per minute to the initial revolutions per minute. For example, the transition region ends at rpm, calculated by adding approximately 80% of the initial rpm to the initial rpm. According to this embodiment, the transition region may include a rpm range of about 200-350 rpm.

Meanwhile, by reducing the intensity of vibration of the drum, the imbalance can be reduced. For this, uniform distribution of the laundry is carried out to distribute the laundry in the drum as much as possible, before the drum rotational speed enters the transition region.

If a counterweight is used, a method may be considered in which the rotational speed of the drum passes through the transition region, while the moving bodies located in the counterweight are located on the side opposite to the unbalance of the laundry. In this case, it is preferable that the moving bodies are located exactly opposite the imbalance in the middle of the transition region.

However, as described above, the transition region of the laundry machine in accordance with this embodiment is relatively wide compared to the transition region of the known laundry machine. Because of this, even if the step of uniformly distributing the laundry or balancing the balls in a rpm range smaller than the transition region is carried out, the laundry may be in a mess, or balancing may not be performed at a drum speed passing through the transition region.

As a result, balancing can be performed at least once in the laundry machine according to this embodiment before and when the drum speed passes through the transition region. In this document, balancing can be defined as the rotation of the drum at a constant speed over a given period of time. This balancing allows the movable body of the counterweight relative to opposite positions of the laundry only to reduce the degree of imbalance. By expanding, a uniform distribution of the laundry is ensured. Ultimately, balancing is performed as the drum speed passes through the transition region, and noise and vibration due to the expansion of the transition region can be prevented.

In this document, when balancing before the drum speed passes through the transition region, balancing can be performed in a rpm range other than rpm of a known laundry machine. For example, if the transition region begins at 200 rpm, balancing is performed in a rpm range of approximately less than 150 rpm. Since the known laundry machine has a relatively less wide transition region, it is not so difficult for the drum speed to pass through the transition region even when balancing is carried out at rpm of approximately less than 150 rpm. However, the laundry machine in accordance with this embodiment has a relatively wide transition region, as described above. If balancing is carried out at such low revolutions per minute as in the known laundry machine, the positions of the moving bodies may be random due to balancing carried out at a drum speed passing through the transition region. As a result, the laundry machine in accordance with this embodiment can increase the balancing revolutions per minute compared to conventional balancing revolutions per minute, when the balancing is carried out before the drum speed enters the transition region. That is, if the initial revolutions per minute of the transition region are determined, balancing is performed in the range of revolutions per minute, large revolutions per minute, calculated by subtracting the value of approximately 25% of the initial revolutions per minute from the initial revolutions per minute. For example, the initial rpm of the transition region is about 200 rpm, balancing can be carried out in the rpm range of large 150 rpm, which is less than 200 rpm.

In addition, the degree of imbalance can be measured during balancing. That is, the control method may further include a step for measuring the degree of imbalance during balancing and for comparing the measured degree of imbalance with an acceptable degree of imbalance, providing an increase in the speed of the drum. If the measured degree of imbalance is less than the allowable degree of imbalance, the drum speed increases after balancing to be outside the transition region. On the contrary, if the measured degree of imbalance is an acceptable degree of imbalance or more, the step of uniformly distributing the laundry may be re-performed. In this case, the allowable degree of imbalance may differ from the allowable degree of imbalance, which provides initial acceleration.

In addition, the vibrational characteristics of the laundry machine in accordance with this embodiment of the present invention will be described with reference to FIG.

As the drum rotational speed increases, a region is created (hereinafter referred to as the “transitional vibration region”) in which an irregular transitional vibration with a high amplitude occurs. The region of transitional vibration arises irregularly with a high amplitude before the transition of the vibration to the region of stable vibration (hereinafter referred to as the “stable region”) and has predetermined vibrational characteristics if a vibration system (laundry machine) is developed. Although the transitional vibration region differs depending on the type of laundry machine, the transitional region occurs approximately in the range of 200-270 rpm. It is believed that the transition region is caused by resonance. Therefore, it is necessary to create a counterbalance, taking into account the effective balancing in the field of transient vibration.

Meanwhile, as described above, in the laundry machine according to this embodiment of the present invention, the vibration source, i.e., the electric motor and the drum connected to the electric motor, are connected to the tub 12 through the rear gasket 250. Thus, the vibration, occurring in the drum is transferred slightly to the tank, and the drum is supported by a damping means and a suspension unit 180 by means of a bearing housing 400. As a result, the tank 12 can be directly fixed to the casing 110 without the use of damping means.

As a result of the studies of the inventor of the present invention, vibrational characteristics, usually not observed, were installed in the laundry machine in accordance with the present invention. According to a known laundry machine, vibration (displacement) becomes constant after passing through the transitional vibration region. However, in the laundry machine according to this embodiment of the present invention, a region (hereinafter referred to as “irregular vibration”) can be created in which the vibration becomes constant after passing through the transitional vibration region and again becomes large. For example, if there is a maximum drum offset or more that occurs in a rpm range smaller than the transition region, or a maximum drum offset or more stable stage in a rpm range larger than the transition region, it is determined that irregular vibration has been created. Alternatively, if an average drum displacement in the transition region occurs, +20 - -20% of the average drum displacement in the transition region, or 1/3 or more of the maximum drum displacement at the natural frequency of the transition region, it can be determined that irregular vibration has occurred.

However, as a result of the studies, irregular vibration occurred in a rpm range larger than the transition region, for example, occurred in an area (hereinafter referred to as the “irregular vibration region”) in the range of about 350-1000 rpm. Irregular vibration can occur as a result of using a counterweight, damping system and rear gasket. Therefore, in the laundry machine, a counterweight needs to be developed taking into account the irregular vibration region as well as the transition vibration region.

For example, the counterweight includes a ball counterweight, it is preferable that the design of the counterweight, i.e. the ball size, the number of balls, the shape of the rolling groove, the viscosity of the oil and the oil filling level, be selected taking into account the area of irregular vibration, as well as the area of transitional vibration. When considering the region of transitional vibration and / or the region of irregular vibration, especially when considering the region of irregular vibration, the ball counterweight has a larger diameter of 255.8 mm and a smaller diameter of 249.2 mm. The cavity of the rolling groove in which the ball is contained has a cross-sectional area of 411.93 mm ² . The number of balls is 14 in front and behind, respectively, and the ball has a size of 19.05 mm. Silicon-based oil, such as polydimethylsiloxane, is used as an oil. Preferably, the oil has a viscosity of 300 St at room temperature and has a fill level of 350 cm ³ .

In addition to the design of the counterweight, taking into account the control, it is preferable to consider the region of irregular vibration, as well as the region of transitional vibration. For example, to prevent irregular vibration, if an irregular vibration region is determined, balancing can be performed at least once before, during and after the drum speed passes through the irregular vibration region. Herein, if the rotational speed of the drum is relatively high, the balancing of the counterweight may not be carried out properly, and balancing may be carried out while reducing the rotational speed of the drum. However, if the rotation speed of the drum is reduced to be less than the transition region for balancing, it must again pass through the transition region. When reducing the speed of rotation of the drum for balancing, the reduced speed of rotation may be greater than the transition region.

Specialists in the art should understand that various modifications and changes are possible in the present invention without departing from the essence or scope of the present invention. Thus, it is understood that the present invention includes modifications and variations of the present invention, provided that they are included in the scope of the attached claims and their equivalents.

Claims (9)

1. A method for controlling a laundry machine equipped with a drive unit comprising a shaft connected to a drum, a bearing housing for rotatably supporting the shaft and an electric motor for rotating the shaft, a suspension unit connected to the drive unit, and a rear gasket for sealing to prevent water leakage for washing from the gap between the drive unit and the tank and ensuring the movement of the drive unit relative to the tank, where the specified control method comprises:
a water supplying step configured to bring the drum into a rubbing motion when water is supplied to the tank; and
a circulation step, configured to circulate water inside the tank for re-supplying water to the tank, which is carried out simultaneously with the start of the water supplying step. 2. The control method according to claim 1, in which the tank is supported more rigidly than the drum supported by the suspension unit. 3. A method for controlling a laundry machine equipped with a drive unit comprising a shaft connected to the drum, a bearing housing for rotatably supporting the shaft and an electric motor for rotating the shaft, a suspension unit connected to the drive unit, and a rear gasket for sealing to prevent water leakage for washing from the gap between the drive unit and the tank and ensuring the movement of the drive unit relative to the tank, where the specified control method comprises:
a washing cycle including at least one stage of water supply, configured to drive the drum for a predetermined period of time after the start of water supply to the tank, or after the water level reaches a predetermined value;
a circulation stage, configured to circulate water inside the tank for re-supplying water to the tank, which is carried out at the stage of water supply. 4. The control method according to claim 3, in which the tank and the drum located in the machine for processing linen, contain rear sections that are inclined downward, respectively. 5. The control method according to claim 3, in which a circulation pipe made with the possibility of circulating water is connected to the front section of the tank. 6. The control method according to claim 3, in which the water supply pipe located in the laundry treating machine is connected to the front portion of the tank, and the turn-on time of the water supply valve is set shorter than the turn-off time when the water supply valve is turned on. 7. The control method according to claim 6, in which the turn-on time is determined to provide a lower pressure of the water supplied through the water supply pipe than the predetermined water pressure. 8. The control method according to claim 7, in which the on-time of the water supply valve is determined to provide a given water pressure high enough so that water is not supplied directly to the drum. 9. The control method according to claim 3, in which the tank is supported more rigidly than the drum supported by the suspension unit.

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