KR102650103B1 - Washing machine and Controlling method for the same - Google Patents

Abstract

The present invention relates to a washing machine in which a drum rotates in various motions and a method of controlling the same. The washing machine of the present invention includes a tub, a drum, a driving unit, a water supply unit, and a pump, and the control unit controls the water supply unit to control the water supply and the pump for supplying washing water supplied from an external water source into the tub. The washing water supplied into the tub is circulated and the driving part is controlled to control the drum core, which rotates the drum in one direction at a speed that prevents the cloth from separating from the inner circumference of the drum. The washing water supplied into the tub is circulated and the driving part is controlled by controlling the pump. By performing rolling washing in which the drum is rotated in one direction at a speed where the cloth rises and then rolls down along the inner circumferential surface of the drum, washing performance can be improved while reducing electrical energy consumption.

Description

Washing machine and control method {Washing machine and Controlling method for the same}

The present invention relates to a washing machine and a control method thereof, and more specifically, to a washing machine in which a drum rotates in various motions and a control method thereof.

In general, a washing machine is a device that uses water, detergent, and mechanical action to clean clothes, bedding, etc. (hereinafter referred to as ‘fabric’) through processes such as washing, rinsing, and dehydration to remove contaminants.

Washing machines are largely divided into agitator type, pulsator type, and drum type washing machines.

The agitating type washes clothes by rotating the washing rod that rises in the center of the washing tank to the left and right, the vortex type washes clothes by rotating the disk-shaped rotor blades formed at the bottom of the washing tank to the left and right and uses the friction between the water current and the cloth, and the drum type washes clothes by rotating the washing rod located at the bottom of the washing tank to the left and right. Add water, detergent, and cloth and rotate the drum to wash.

A drum washing machine is equipped with a tub that accommodates washing water inside a cabinet that forms the exterior, a drum that accommodates laundry is disposed inside the tub, a drive unit for rotating the drum is installed on the back side of the tub, and a tub is installed in the drive unit. A drive shaft is installed that passes through and connects to the rear side of the drum. A lifter is installed inside the drum to lift the gun when the drum rotates.

In these drum washing machines, the size of the drum has recently been increasing in order to process a large amount of laundry at once, but there is a problem in that the use of washing water and electrical energy increases as the drum size increases.

The problem to be solved by the present invention is to provide a washing machine and its control method that can improve washing performance even with a small amount of washing water and low energy use.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

In order to achieve the above object, the washing machine of the present invention includes a tub, a drum, a driving unit, a water supply unit, and a pump, and a control unit controls the water supply unit to supply washing water supplied from an external water source into the tub. The water supply and the pump are controlled to circulate the wash water supplied into the tub, and the driving unit is controlled to rotate the drum in one direction at a speed that prevents the cloth from separating from the inner circumference of the drum. The pump is controlled to control the wash water supplied into the tub. By controlling the driving part while circulating, rolling washing is performed by rotating the drum in one direction at a speed where the fabric rises and then rolls down along the inner circumferential surface of the drum, allowing the fabric to be sufficiently wetted with washing water and contamination of the fabric can be removed.

The washing machine of the present invention further includes a circulation nozzle that sprays washing water circulated by the pump into the drum during wet and rolling washing, and the pump changes the discharge pressure, which is the pressure of the discharged washing water, so that the pump rotates the circulation nozzle. You can adjust the height and distance of the sprayed washing water.

The control unit controls the pump so that the discharge pressure of the pump when performing wetting is greater than the discharge pressure of the pump when performing rolling washing, so that wash water can be sprayed in different forms when performing wetting and rolling washing.

After performing rolling washing, the control unit controls the pump to circulate the washing water supplied into the tub, and controls the driving unit to perform tumbling washing, which rotates the drum in one direction at a speed at which the cloth rises, separates from the inner circumference of the drum, and falls, thereby eliminating contamination of the cloth. It is possible to remove the foam and perform foam dispersion.

After performing tumbling washing, the control unit controls the driving unit to perform washing spin-drying by accelerating the drum at high speed so that the washing water soaked in the cloth escapes.

In order to achieve the above problem, the control method of the washing machine of the present invention includes a water supply step of supplying wash water supplied from an external water source into the tub, and circulating the wash water supplied into the tub to separate the laundry contained in the drum from the inner peripheral surface of the drum. Washing the fabric, including a wetting step in which the drum is rotated in one direction at a slow speed, and a rolling washing step in which the drum is rotated in one direction so that the wash water supplied into the tub is circulated and the fabric rises and then rolls down along the inner circumferential surface of the drum. It can sufficiently wet the water and remove contamination from the bag.

Washing water circulating in the wetting stage is sprayed into the drum and rises above half the height of the drum before reaching the back of the drum. Washing water circulating in the rolling stage is sprayed into the drum and rising below half the height of the drum before reaching the back of the drum. It can reach the lower part of the inner surface of the drum.

Specific details of other embodiments are included in the detailed description and drawings.

According to the washing machine and its control method of the present invention, one or more of the following effects are achieved.

First, when soaking the cloth, a filtration motion is performed and washing water is sprayed to ensure that the cloth has sufficient washing water. There is an advantage. In addition, the washing water is sprayed to the rear of the drum so that the washing water is sufficiently sprayed into the cloth at the rear of the drum.

Second, when a rolling motion is performed during washing, when the drum has a large capacity, electrical energy consumption is reduced, and the mechanical force applied to the cloth is sufficient, thereby ensuring washing performance. In addition, there is an advantage that the washing water is sprayed to the lower part of the inner circumference of the drum, thereby reducing energy consumption while sufficiently applying the washing water to the cloth.

Third, there is also the advantage of making it easy to enter the spin-drying process by performing a rolling motion during washing, followed by a tumbling motion and then spin-drying. After washing using a rolling motion, the tumbling motion performs fabric dispersion and unwinding, and immediately enters spin-drying, shortening the washing time.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view showing a washing machine according to an embodiment of the present invention.
Figure 2 is a perspective view of the internal structure of the washing machine shown in Figure 1.
FIG. 3 is a partial cross-sectional view of the washing machine shown in FIG. 1.
FIG. 4 is a front view of the internal structure of the washing machine shown in FIG. 1.
Figure 5 is a block diagram of a washing machine according to an embodiment of the present invention.
Figure 6 is a diagram showing the entire process of the washing machine control method according to an embodiment of the present invention.
Figure 7 is a diagram showing a control method for wetting and washing in a washing machine control method according to an embodiment of the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The present embodiments are merely provided to ensure that the disclosure of the present invention is complete and to be understood by those skilled in the art. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, the present invention will be described with reference to the drawings for explaining a washing machine and its control method according to embodiments of the present invention.

Figure 1 is a perspective view showing a washing machine according to an embodiment of the present invention, Figure 2 is a perspective view of the internal structure of the washing machine shown in Figure 1, Figure 3 is a partial cross-sectional view of the washing machine shown in Figure 1, and Figure 4 is a front view of the internal structure of the washing machine shown in Figure 1.

The washing machine 100 according to an embodiment of the present invention includes a cabinet 111 forming an exterior, a tub 122 for receiving washing water, a drum 124 disposed in the tub for accommodating laundry and rotating it, and , a driving unit 113 that rotates the drum, a water supply unit 132 that controls the inflow of washing water from an external water source, and the water supply unit 132 sprays washing water supplied from an external water source into the drum 124. a spray nozzle 151 that contains detergent, a detergent box 133 in which detergent is accommodated and the washing water is mixed with the detergent, a pump 136 that discharges the washing water in the tub and circulates it into the tub, and It includes a circulation nozzle 139 that sprays washing water into the drum 124.

The cabinet 111 forms the exterior of the washing machine 100. A tub 122 is provided inside the cabinet 111. The cabinet 111 is formed with a gun entrance hole 120 to allow the gun to enter and exit. A door 112 is rotatably provided on the front of the cabinet 111 to enable opening and closing of the gun entrance hole 120. The cabinet 111 is equipped with a control panel 114 that receives commands from the user and displays various status information of the washing machine 100. The cabinet 111 is provided with a retractable detergent box 133 that contains detergents such as laundry detergent, rinse detergent, or bleach.

The tub 122 is placed inside the cabinet 111 to be cushioned by a spring (not shown) and a damper (not shown). The tub 122 accommodates washing water. A drum 124 is disposed inside the tub 122.

The tub 122 may be equipped with a water level sensor 121 that detects the water level of the washing water contained in the tub. The water level sensor 121 can be implemented in a variety of ways. In this embodiment, the gap between electrodes is changed using air pressure that changes depending on the washing water level, and the water level is measured by the change in capacitance of the electrodes. A heater 143 for heating washing water may be provided inside the tub 122.

The drum 124 accommodates the gun and rotates. In this embodiment, drum 124 rotates about a horizontal axis. The drum 124 is formed with a plurality of through holes 124b to allow washing water to pass through. A lifter 124a may be disposed on the inner peripheral surface of the drum 124 to lift the gun to a certain height when the drum 124 rotates. The drum 124 rotates by receiving rotational force from the driving unit 113.

The drum 124 may not be arranged completely horizontally, but may be arranged to have a predetermined inclination so that the rear portion of the drum 124 falls below the horizontal level. At this time, the rotation center of the drum 124 may be tilted from the horizontal axis.

The gasket 128 is provided between the tub 122 and the cabinet 111 to seal the tub 122 and the cabinet 111. The gasket 128 is disposed between the entrance of the tub 122 and the gun entrance hole 120. The gasket 128 alleviates the shock transmitted to the door 112 when the drum 124 rotates and prevents the washing water in the tub 122 from leaking to the outside.

The gasket 128 may be formed integrally with one material, but in order to secure the connection strength and sufficient rigidity with the tub 122, the portion connected to the tub 122 is made of a hard material. The part connected to the cabinet 111 may be made of an elastic material to alleviate vibration transmitted from the tub 122 to the cabinet 111.

The gasket 128 is provided with a spray nozzle 151 and a circulation nozzle 139 that introduce washing water into the drum 124, and a steam nozzle 152 that sprays steam into the drum 124.

The driving unit 113 rotates the drum 124. The driving unit 113 can rotate the drum 124 at various rotational speeds or directions. The driving unit 113 may be composed of a driving motor, a switching element that controls it, a clutch, etc. The driving unit 113 may include a sensor that measures the actual rotation speed of the drum 124.

The detergent box 133 accommodates detergents such as laundry detergent, rinse detergent, or bleach. The detergent box 133 is preferably provided in a removable manner at the front of the cabinet 111. When washing water is supplied, the detergent in the detergent box 133 is mixed with the washing water and flows into the tub 122. The detergent box 133 may be formed into a section containing laundry detergent, a section containing rinsing detergent, and a section containing bleach.

The washing machine 100 is connected to a hot water source (H.W) that supplies hot water from an external water source through a hot water hose (115a), and is connected to a cold water source (C.W) that supplies cold water from an external water source through a cold water hose (115b). . The water flowing in through the hot water hose 115a and the cold water hose 115b is supplied to the detergent box 133, steam unit 145, and/or spray nozzle 151 through appropriate control of the water supply unit 132.

Inside the cabinet 111, there is a water supply unit 132 connected to the hot water hose 115a and the cold water hose 115b to control the inflow of washing water from an external water source, and a water supply unit 132 connected to the water supply unit 132. ) is connected to the first water supply hose (131a) and second water supply hose (131b), which guide the washing water supplied from the cold water source (C.W) to the detergent box (133), and the water supply unit (132) to supply water. A third water supply hose 131c is provided to guide the washing water supplied from the cold water source (C.W) to the spray nozzle 151 and the detergent box 133 according to the operation of the unit 132. The third water supply hose 131c is branched from the water supply unit 132 and connected to the spray nozzle 151 and the detergent box 133, respectively.

In addition, inside the cabinet 111, there is a fourth water supply hose ( 131d), and a fifth water supply hose (131e) that is connected to the water supply unit 132 and guides high-temperature washing water supplied from the hot water source (H.W) to the detergent box 133 according to the operation of the water supply unit 132. It is provided.

The interior of the cabinet 111 is preferably provided with a water supply pipe 134 through which washing water mixed with detergent from the detergent box 133 flows into the tub 122.

The water supply unit 132 includes a free valve (132a) connected to the first water supply hose (131a), a main valve (132b) connected to the second water hose (131b), and a bleach valve connected to the third water hose (131c). (132c), a steam valve (132d) connected to the fourth water supply hose (131d), and a hot water valve (132e) connected to the fifth water supply hose (131e) to control the inflow of high-temperature washing water.

When opened, the free valve (132a) supplies washing water to the detergent box (133) through the second water supply hose (131b). The washing water supplied by the free valve 132a passes through the detergent-accommodating part of the detergent box 133 and is mixed with pre-wash detergent before being supplied into the tub 122 through the water supply pipe 134. When there is no detergent for pre-washing, the washing water supplied by the free valve 132a is not mixed with the detergent for pre-washing and is supplied into the tub 122 through the water supply pipe 134.

When opened, the main valve (132b) supplies washing water to the detergent box (133) through the second water supply hose (131b). The washing water supplied by the main valve 132b passes through the detergent-accommodating part of the detergent box 133, is mixed with laundry detergent, and is then supplied into the tub 122 through the water supply pipe 134.

When opened, the bleach valve 132c supplies washing water to the spray nozzle 151 and the detergent box 133 through the third water hose 131c. A portion of the washing water supplied by the bleach valve 132c is sprayed into the drum 124 through the spray nozzle 151. Another part of the washing water supplied by the bleach valve 132c is mixed with bleach in the detergent box 133 and supplied into the tub 122 through the water supply pipe 134. When there is no bleach, the washing water supplied by the bleach valve 132c is not mixed with the bleach but is supplied into the tub 122 through the water supply pipe 134.

When opened, the steam valve 132d supplies washing water to the steam unit 145 through the fourth water hose 131d. Washing water supplied by the steam valve 132d is heated in the steam unit 145 and converted into steam. Steam generated in the steam unit 145 is supplied to the steam nozzle 152 through the steam supply hose 130 and is injected into the drum 124 through the steam nozzle 152.

When opened, the hot water valve 132e supplies high-temperature washing water to the detergent box 133 through the fifth water supply hose 131e. Washing water supplied by the hot water valve 132e passes through the detergent box 133 and is supplied into the tub 122 through the water supply pipe 134.

Inside the cabinet 111, there is a drain pipe 135 through which the wash water in the tub 122 flows out, a pump 136 through which the wash water in the tub 122 flows out, and a circulation nozzle so that the wash water circulates and sprays into the drum 124. A circulation hose 137 connected to 139 and a drain hose 138 through which washing water is drained to the outside are provided.

The pump 136 discharges the washing water in the tub 122. The pump 136 drains the washing water discharged from the tub 122 through the drain pipe 135 to the outside through the drain hose 138 or circulates it into the tub 122 through the circulation hose 137. Depending on the embodiment, the pump 136 may be provided as a circulation pump and a drainage pump and may be connected to a circulation hose 137 and a drainage hose 138, respectively.

The pump 136 includes a pump motor that generates rotational force, and the pump motor is preferably a BLDC motor (Brushless Direct Current Motor) whose rotation speed is variable. As the rotational speed of the pump motor changes, the discharge pressure, which is the pressure of the washing water discharged from the pump 136, changes.

The circulation hose 137 connects the pump 136 and the circulation nozzle 139. Washing water discharged from the tub 122 by the pump 136 is sprayed into the drum 124 from the circulation nozzle 139 through the circulation hose 137.

The control panel 114 includes an input unit 114b that receives various operation commands from the user, such as selecting a washing course or operation time and reservation for each cycle, and a display unit 114a that displays the operating status of the washing machine 100. It can be provided.

Depending on the type or function of the fabric, the washing course includes a lingerie/wool course, a boiling course, a speed wash course, a functional clothing course, a fabric damage prevention course, a quiet cleaning course, and an energy saving course in addition to the standard course. The operation of the washing machine 100 is divided into a washing cycle, a rinsing cycle, and a dehydration cycle, and within each cycle, a water supply stage, a washing stage, a rinsing stage, a drain stage, a dehydration stage, or a drying stage are performed.

The spray nozzle 151 is provided on the gasket 128 and sprays washing water into the drum 124. The injection nozzle 151 is provided adjacent to the steam nozzle 127. The spray nozzle 151 is connected to the first water supply hose 131a and sprays washing water supplied from an external water source into the drum 124.

The spray nozzle 151 is preferably provided on the upper part of the gasket 128. Depending on the embodiment, the spray nozzle 151 is located below the gasket 128, between the gasket 128 and the cabinet 111, or in the cabinet 111. ), it can be placed in various locations such as the tub 122.

The spray nozzle 151 is preferably an atomizing nozzle that sprays finely divided wash water onto the inner peripheral surface and rear of the drum 124.

The steam nozzle 152 is provided on the gasket 128 and sprays steam into the drum 124. The steam nozzle 152 is connected to the steam hose 146 and sprays steam generated in the steam unit 145 into the drum 124.

The steam nozzle 152 is provided adjacent to the spray nozzle 151 on the upper part of the gasket 128. Depending on the embodiment, the steam nozzle 152 may be placed in various locations, such as below the gasket 128, between the gasket 128 and the cabinet 111, in the cabinet 111, and in the tub 122.

The circulation nozzle 139 is provided on the gasket 128 and sprays washing water circulated by the pump 136 into the drum 124. The circulation nozzle 139 is connected to the circulation hose 137 and sprays the washing water circulated by the pump 136 into the drum 124. The circulation nozzle 139 may be formed integrally with the gasket 128.

It is preferable that the circulation nozzle 139 is provided below the rotation axis of the drum 124 and sprays washing water upward. A plurality of circulation nozzles 139 may be provided, so that two circulation nozzles may be provided on both sides of the lower part of the gasket 128. The first circulation nozzle 139a is provided on the lower left side of the gasket 128 and sprays washing water upward and right toward the inside of the drum 124, and the second circulation nozzle 139b is located on the right side of the gasket 128. It is preferable that it is provided at the bottom and sprays the washing water upward and to the left toward the inside of the drum 124.

Washing water discharged upward through the circulation nozzle 139 is sprayed in a parabolic shape. Washing water can reach the inner peripheral surface and rear of the drum 124 in an upward direction through the circulation nozzle 139 according to the discharge pressure of the pump 136.

When the circulation nozzle 139 is provided in plurality, the circulation hose 137 is provided in plurality, so that the first circulation hose 137a is connected to the first circulation nozzle 139a, and the second circulation hose 137b is connected to the second circulation nozzle 139a. It is preferable to be connected to the circulation nozzle (139b).

Washing water contained in the tub 122 moves to the pump 136 along the drain pipe 135. The pump 136 allows washing water to reach the circulation nozzle 139 through the circulation hose 137. Washing water is sprayed into the drum 124 through the circulation nozzle 139.

Figure 5 is a block diagram of a washing machine according to an embodiment of the present invention.

The control unit 141 controls the entire operation of the washing machine according to the operation command received by the input unit 114b. The control unit 141 is preferably provided within the control panel 114. It may be composed of a microcomputer that controls the operation of the washing machine, a storage device, and other electronic components. The control unit 141 determines whether to proceed with each cycle or whether, time, and number of repetitions such as water supply, washing, rinsing, draining, spin-drying, and drying within each cycle, and performs these operations according to the washing course selected by the user. do.

The control unit 141 receives the water level of washing water measured by the water level sensor 121 and processes it. The control unit 141 receives the rotational speed of the drum 124 measured by the driving unit 113 and processes it. The control unit 141 receives an operation command from the input unit 114b and displays the operating status of the washing machine 100 on the display unit 114a. The control unit 141 controls the water supply unit 132, the drive unit 113, the pump 136, and the steam unit 145 according to the selected course or other operation commands.

Figure 6 is a diagram showing the entire process of the washing machine control method according to an embodiment of the present invention.

The water supply 210 is a step in which washing water supplied from an external water source is mixed with laundry detergent and then supplied into the tub 122. At the beginning of water supply (210), weight detection is performed. Laundry weight detection is performed before operating the water supply unit 132 to supply washing water.

Laundry weight detection is a step in which the driving unit 113 is driven to detect the amount of laundry (hereinafter referred to as 'laundry weight') contained in the drum 124. In laundry weight detection, the weight of laundry can be measured in various ways. In this embodiment, the driving unit 113 rotates the drum 124 at a constant rotation speed for a certain period of time and then the control unit 141 measures the deceleration time. do. The longer the deceleration time of the drum 124, the higher the level of the laundry amount. Depending on the embodiment, the control unit 141 may calculate the weight by measuring the acceleration time when accelerating the drum 124.

The control unit 141 sets the target water level according to the detected weight. The target water level is the target amount of washing water to be supplied into the tub 122 after completion of the washing water supply 220. The control unit 141 detects the water level through the water level sensor 121 when the washing water supply 220 is completed when the water level is the target water level. The water supply unit 132 is controlled to supply washing water into the tub 122. The control unit 141 determines the execution time of each step according to the sensed laundry weight. The control unit 141 may determine the motion of the drum 124 during the laundry loading 220 and washing 230 depending on the detected laundry weight. This embodiment is preferably performed when the sensed amount of laundry is greater than or equal to a set reference amount of laundry.

After detecting the weight of laundry, the control unit 141 controls the water supply unit 132 to supply washing water into the tub 122. The control unit 141 opens the main valve 132b to supply washing water from the cold water source (C.W), which is an external water source. When the main valve (132b) is opened, washing water is supplied to the detergent box (133) through the second water supply hose (131b). The washing water supplied by the main valve 132b passes through the detergent-accommodating part of the detergent box 133, is mixed with laundry detergent, and is then supplied into the tub 122 through the water supply pipe 134. The control unit 141 controls the main valve 132b to supply wash water intermittently so that the wash water is smoothly mixed with the laundry detergent.

The control unit 141 can supply washing water from the cold water source (C.W), which is an external water source, by opening the free valve 132a. When the free valve 132a is opened, washing water is supplied to the detergent box 133 through the first water supply hose 131a. When there is detergent for pre-washing in the detergent box 133, the washing water supplied to the detergent box 133 is mixed with the detergent for pre-washing and then supplied into the tub 122 through the water supply pipe 134. When there is no detergent for pre-washing, the washing water supplied by the free valve 132a is not mixed with the detergent for pre-washing and is supplied into the tub 122 through the water supply pipe 134.

The control unit 141 may open the hot water valve 132e to supply high-temperature washing water from the hot water source (H.W), which is an external water source. When the hot water valve 132e is opened, hot washing water is supplied to the detergent box 133 through the fifth water supply hose 131e. Washing water supplied by the hot water valve 132e is supplied into the tub 122 through the water supply pipe 134. The control unit 141 opens the hot water valve 132e for several seconds at intervals of several seconds to several minutes to supply hot washing water into the tub 122.

The control unit 141 opens the bleach valve 132c to spray washing water supplied from the cold water source (C.W), which is an external water source, into the drum 124 through the spray nozzle 151.

When supplying water 210, the control unit 141 drives the driving unit 113 to rotate the drum 124. The control unit 141 operates the water supply unit 132 to supply washing water into the tub 122 and operates the drive unit 113 to rotate the drum 124. By rotating the drum 124, the cloth is soaked in the washing water.

When supplying water 210, the control unit 141 controls the driving unit 113 to rotate the drum 124 in a set motion. In this embodiment, the control unit 141 controls the driving unit 113 to accelerate the drum 124 to 150 RPM or more so that the carriage attaches to the inner peripheral surface of the drum 124, and then brakes the drum 124 to make the carriage adhere to the drum 124. ) can be performed to make it fall off the inner circumferential surface. The control unit 141 preferably performs the above-described squeeze motion when spraying washing water into the drum 124 through the spray nozzle 151.

Additionally, the control unit 141 may cause the drum 124 to perform a tumbling or rolling motion, which will be described later. It is preferable that the control unit 141 performs the rolling motion after performing the above-described squeeze motion.

When the water level of the washing water in the water supply 210 reaches a level at which the washing water contained in the tub 122 can be circulated by the pump 136, the control unit 141 operates the pump 136 to supply the water into the tub 122. Washing water can be circulated. The control unit 141 operates the pump 136 to spray the circulated washing water into the drum 124 through the circulation nozzle 139.

When supplying water 210, the control unit 141 controls the water supply unit 132 to supply washing water into the tub 122, and at the same time operates the pump 136 to circulate the washing water through the circulation nozzle 139 to the drum ( 124) It can be sprayed inside.

When the water level of the tub 122 measured by the water level sensor 121 reaches the target water level, the control unit 141 stops the operation of the water supply unit 132, the driver 113, and/or the pump 136 to supply water ( 210) ends. The target water level at which the water supply 210 ends is preferably higher than the water level at which the washing water can be circulated by the pump 136 and lower than the water level at which the washing water supplied to the tub 122 reaches the drum 124.

The cloth wetting center 220 controls the driving unit 113 to rotate the drum 124 so that the washing water mixed with laundry detergent is evenly wetted in the cloth, and controls the pump 136 to circulate the washing water and spray it into the drum 124. This is the step. A detailed description of the foam core 220 will be described later with reference to FIG. 7.

Washing 230 is a step in which contamination of the fabric is removed by applying mechanical force to the fabric by rotating the drum 124 to move the fabric. A detailed description of the washing 230 will be described later with reference to FIG. 7 .

The washing spin-drying operation (240) is a step in which the drum (124) is accelerated at high speed so that the washing water soaked in the cloth is drained. When the laundry dehydration 240 is started, the control unit 141 operates the pump 136 for a set time to discharge the washing water in the tub 122 to the outside along the drain hose 138. During the laundry spin-drying operation 240, the control unit 141 drives the driving unit 113 to accelerate the drum 124 so that the washing water soaked in the cloth is discharged. Since the fabric does not need to be completely dried during washing and dehydration (240), the driving unit 113 accelerates the drum 124 to 600 RPM. When the drum 124 accelerates, the control unit 141 intermittently operates the pump 136 to discharge the washing water in the tub 122 to the outside along the drain hose 138.

Rinsing 250 removes residual detergent and contamination from the fabric by rotating the drum 124 containing the fabric and moving the fabric. When the rinsing 250 starts, the control unit 141 operates the water supply unit 132 to supply washing water supplied from an external water source to the tub 122. It is preferable that the wash water supplied from an external water source is mixed with the rinse detergent and then supplied to the tub 122.

When the supply of washing water is completed during rinsing (250), the control unit 141 controls the driving unit 113 to rotate the drum 124 and operates the pump 136 to circulate the washing water supplied into the tub 122. do. The control unit 141 rotates the drum 124 and sprays the circulating washing water into the drum 124 through the circulation nozzle 139.

Main spin-drying (260) is a step in which the drum (124) is rotated at high speed so that the washing water soaked in the cloth is drained. When the main spin-off 260 is started, the control unit 141 operates the pump 136 for a set time to discharge the washing water in the tub 122 to the outside along the drain hose 138. It is preferable that the driving unit 113 rotates the drum 124 at a rotation speed of 1000 RPM or more so that the fabric is dried as much as possible during main dehydration (260). It is preferable that the maximum rotation speed of the drum 124 during main spin-drying (260) is higher than the maximum rotation speed of laundry spin-drying (240). When the drum 124 accelerates, the control unit 141 intermittently operates the pump 136 to discharge the washing water in the tub 122 to the outside along the drain hose 138.

Figure 7 is a diagram showing a control method for wetting and washing in a washing machine control method according to an embodiment of the present invention.

During the wetting process 220, the control unit 141 controls the pump 136 to circulate the washing water supplied into the tub 122, and controls the drive unit 113 to speed up the laundry so that it does not separate from the inner peripheral surface of the drum 124. Rotates the drum 124 in one direction. At the time of wetting (220), the control unit (141) sprays the washing water circulated into the drum (124) through the circulation nozzle (139) and simultaneously performs a filtration motion of the drum (124).

As shown in (a) of FIG. 7, the filtration motion is a motion in which the driving unit 113 rotates the drum 124 in one direction so that the cloth does not fall from the inner peripheral surface of the drum 124 due to centrifugal force. During the filtration motion, the gun is in close contact with the inner peripheral surface of the drum 124 in an annular shape and rotates together with the drum 124. The filtration motion determines the rotation speed of the drum 124 so that the centrifugal force generated by the rotation of the gun is greater than gravity (1G). In this embodiment, the control unit 141 rotates the drum 124 at 80 RPM.

During the wetting process 220, it is preferable that the control unit 141 controls the driving unit 113 to repeat the filtration motion several times. In other words, when loading the drum 220, the control unit 141 may accelerate the drum 124 at a speed that does not separate the drum 124 from the inner peripheral surface of the drum 124, then maintain the speed for a certain period of time and decelerate the drum 124, and repeat this several times. there is.

When the washing water circulated during the filtration motion is sprayed through the circulation nozzle 139, the sprayed washing water adheres to the inner circumferential surface of the drum 124 in an annular shape so that the rotating cloth can be evenly wetted. At the time of wetting (220), the control unit (141) controls the pump (136) so that the washing water sprayed through the circulation nozzle (139) rises beyond half the height of the drum (124) and then reaches the rear of the drum (124). . During the wetting process 220, the control unit 141 relatively speeds up the rotational speed of the pump motor so that the discharge pressure of the pump 136 is relatively high. When the amount of laundry is large, the laundry may gather at the rear when performing the filtration motion, so it is desirable that the washing water sprayed through the circulation nozzle 139 reaches the rear of the drum 124 as much as possible.

The control unit 141 may continue to operate the pump 136 while the wetting process 220 is performed, and depending on the embodiment, the pump 136 operates while the drive unit 113 rotates the drum 124 at a constant speed. The pump 136 may be operated intermittently only while the gun is in complete contact with the inner surface of the drum 124.

In this embodiment, the laundry 230 may include a rolling laundry 231 in which the drum 124 is operated in a rolling motion and a tumbling laundry 232 in which the drum 124 is operated in a tumbling motion.

During rolling washing 231, the control unit 141 controls the pump 136 to circulate the washing water supplied into the tub 122, and controls the drive unit 113 to raise the cloth and roll it along the inner peripheral surface of the drum 124. Rotate the drum 124 in one direction so that it falls. During rolling washing 231, the control unit 141 sprays washing water circulated into the drum 124 through the circulation nozzle 139 and simultaneously performs a rolling motion of the drum 124.

In the rolling motion, as shown in (b) of FIG. 7, the driving unit 113 rotates the drum 124 in one direction, but the cloth on the inner peripheral surface of the drum 124 rotates less than about 90 degrees in the rotation direction of the drum (drum 124). It is a controlled motion to roll down to the lowest point of the drum 124 from a position of less than half the height.

When the driving unit 113 rotates the drum 124 at about 40 RPM, the gun located at the lowest point of the drum 124 rises along the rotational direction of the drum 124 and then rotates less than 90 degrees in the rotation direction of the lowest point of the drum 124. It flows to the lowest point of the drum 124 as if rolling from the position. Visually, when the drum 124 rotates clockwise, the gun continuously rolls in the three quadrants of the drum.

The fabric is washed through friction with the washing water, friction between the fabrics, and friction with the inner peripheral surface of the drum 124 through a rolling motion. In particular, when the drum capacity is large, the electrical energy consumption to perform the rolling motion is less than the electrical energy consumption to perform the tumbling motion, and in large-capacity washing machines, the mechanical force applied to the cloth by the rolling motion is sufficiently large, ensuring washing performance. do.

Additionally, during the rolling motion, the gun is sufficiently turned over, making it possible to achieve the effect of gently rubbing the gun.

Here, the rotation speed of the drum 124 is determined in relation to the radius of the drum 124. That is, as the rotation speed of the drum 124 increases, centrifugal force is generated in the cloth within the drum 124. Due to the size difference between centrifugal force and gravity, the flow of the gun inside the drum 124 changes. Of course, the rotational force of the drum 124 and the friction force between the drum 124 and the gun must also be considered. In the rolling motion, the rotation speed of the drum 124 is determined so that centrifugal force and friction force are generated less than gravity (1G).

During rolling washing 231, it is preferable that the control unit 141 controls the driving unit 113 to repeat the rolling motion several times. That is, during rolling washing 231, the control unit 141 may accelerate the drum 124 at a speed at which the laundry rolls on the inner circumferential surface of the drum 124, then maintain the speed for a certain period of time and then repeat the deceleration process several times.

When the washing water circulated during the rolling motion is sprayed through the circulation nozzle 139, the sprayed washing water acts on the cloth. During rolling washing 231, the control unit 141 controls the pump 136 so that the washing water sprayed through the circulation nozzle 139 rises below half the height of the drum 124, and then the lower portion of the inner peripheral surface of the drum 124 (drum ( 124) to reach the 3rd quadrant and the inner peripheral surface of the 4th quadrant). During rolling washing 231, the control unit 141 relatively slows the rotation speed of the pump motor so that the discharge pressure of the pump 136 is relatively low. When performing the rolling motion, the cloth continuously rolls in the 3rd or 4th quadrant of the drum 124, so that the washing water sprayed through the circulation nozzle 139 reaches the inner peripheral surface of the 3rd or 4th quadrant of the drum 124. .

The control unit 141 may continue to operate the pump 136 while the rolling laundry 231 is performed, and depending on the embodiment, the pump 136 may operate while the drive unit 113 rotates the drum 124 at a constant speed. The pump 136 may be operated intermittently or only while the gun is rolling on the inner surface of the drum 124.

During tumbling washing 232, the control unit 141 controls the pump 136 to circulate the washing water supplied into the tub 122, and controls the drive unit 113 to raise the cloth and separate it from the inner peripheral surface of the drum 124. Rotate the drum 124 in one direction so that it falls. During tumbling washing 232, the control unit 141 sprays washing water circulated into the drum 124 through the circulation nozzle 139 and simultaneously performs a tumbling motion of the drum 124.

In the tumbling motion, as shown in (c) of FIG. 7, the driving unit 113 rotates the drum 124 in one direction, and the cloth on the inner peripheral surface of the drum 124 rotates in the rotation direction of the drum by about 90 to 100 degrees (drum ( 124) It is a controlled motion to fall from a position of approximately half or more of the height to the lowest point of the drum 124.

The gun put into the drum 124 is located at the lowest point of the drum 124 before the driving unit 113 is driven. When the driving unit 113 rotates the drum 124 at about 46 RPM, the gun is lifted from the lowest point of the drum 124 by the lifter 124a to a position of about 90 to 110 degrees in the rotation direction and then moved to the lowest point of the drum 124. falls in the direction

In the tumbling motion, the rotation speed of the drum 124 is determined so that centrifugal force and friction force are generated less than gravity (1G). In the tumbling motion, the rotation speed of the drum 124 is determined so that a centrifugal force greater than the centrifugal force in the rolling motion is generated, but less than that of gravity. The maximum rotation speed of the drum 124 during a tumbling motion is slower than the maximum rotation speed of the drum 124 during a filtration motion and is faster than the maximum rotation speed of the drum 124 during a rolling motion.

Visually, the tumbling motion is when the drum 124 rotates clockwise, the gun moves from the third quadrant to a part of the second quadrant at the lowest point of the drum 124, then leaves the inner peripheral surface of the drum 124 and falls to the lowest point of the drum 124. do.

The tumbling motion allows the fabric to be washed by friction with the wash water and impact forces caused by falling. In addition, the tumbling motion is a motion in which the cloth falls away from the inner peripheral surface of the drum 124, so the tangled cloth is separated and the cloth is dispersed. Due to the tumbling motion, the fabric unwinds and disperses the fabric, thereby reducing the generation of vibration and noise caused by tangles or eccentricity of the fabric when entering the laundry spin-drying machine (240).

During tumbling washing 232, it is preferable that the control unit 141 controls the driving unit 113 to repeat the tumbling motion several times. That is, during tumbling washing 232, the control unit 141 may accelerate the drum 124 to the speed at which the cloth rises and then falls, then maintain the speed for a certain period of time and then decelerate the drum 124. This may be repeated several times.

When the washing water circulated during the tumbling motion is sprayed through the circulation nozzle 139, the sprayed washing water acts on the cloth. During tumbling washing 232, the control unit 141 controls the pump 136 so that the washing water sprayed through the circulation nozzle 139 rises to about half the height of the drum 124, and then the lower and/or rear inner surface of the drum 124. to reach. During tumbling washing 232, the control unit 141 adjusts the rotational speed of the pump motor so that the discharge pressure of the pump 136 is between the discharge pressure of the rolling washing 231 and the discharge pressure of the foam core 220. When performing a tumbling motion, the cloth rises to more than half the height of the drum 124 and then separates from the inner circumferential surface of the drum 124 and falls, so the washing water sprayed through the circulation nozzle 139 flows into the drum 124. After rising to about half of the height, it reaches the lower and/rear inner peripheral surface of the drum 124.

The control unit 141 may continue to operate the pump 136 while the tumbling washing 232 is performed, and depending on the embodiment, the pump 136 may be operated while the drive unit 113 rotates the drum 124 at a constant speed. The pump 136 can be operated intermittently only while the gun is operating or the gun is rising and falling.

The operation time of the tumbling laundry 232 is preferably smaller than the operation time of the rolling laundry 231. Since the rolling washing (231) sufficiently removes contamination from the fabric, the tumble washing (232) requires only a short period of time for the fabric to unfold and disperse. For tumbling washing (232), 1/10 of the total washing (230) time is sufficient.

In the above, preferred embodiments of the present invention have been shown and described, but the present invention is not limited to the specific embodiments described above, and can be used in the technical field to which the invention pertains without departing from the gist of the present invention as claimed in the patent claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be understood individually from the technical idea or perspective of the present invention.

113: driving unit 114: control panel
122: tub 124: drum
128: Gasket 132: Water supply unit
132a: Free valve 132b: Main valve
132c: bleach valve 132d: steam valve
132e: hot water valve 133: detergent box
136: Pump 137: Circulating hose
138: Drain hose 139: Circulating nozzle
141: Control unit 151: Spray nozzle
152: Steam nozzle

Claims (9)

A tub that receives washing water;
a drum disposed within the tub and capable of accommodating the gun and rotating;
a driving unit that rotates the drum;
A water supply unit that controls the inflow of washing water from an external water source;
a pump having a pump motor, which discharges the washing water from the tub and circulates it into the tub or drains it to the outside; and
It includes a control unit that controls the driving unit, the water supply unit, and the pump,
The control unit,
Water supply that controls the water supply unit to supply washing water supplied from an external water source into the tub;
a laundry center that controls the pump to circulate the washing water supplied into the tub and controls the driving unit to rotate the drum in one direction at a speed that prevents the fabric from separating from the inner peripheral surface of the drum;
Controlling the pump to circulate the washing water supplied into the tub and controlling the drive unit to perform rolling washing by rotating the drum in one direction at a speed where the fabric rises and then rolls down along the inner peripheral surface of the drum,
A washing machine wherein the rotational speed of the pump motor during rolling washing is slower than the rotational speed of the pump motor when wetting the laundry. According to claim 1,
It further includes a circulation nozzle that sprays the washing water circulated by the pump into the drum during the wetting core and the rolling washing,
The pump changes the discharge pressure, which is the pressure of the washing water being discharged,
The control unit controls the pump so that the discharge pressure of the pump when performing the wetting is greater than the discharge pressure of the pump when performing the rolling washing. According to claim 1,
After performing the rolling wash, the control unit controls the pump to circulate the washing water supplied into the tub, and controls the drive unit to rotate the drum in one direction at a speed at which the fabric rises and then separates from the inner peripheral surface of the drum and falls. A washing machine that performs tumbling washing. According to claim 3,
A washing machine wherein the maximum rotational speed of the drum during the tumbling washing is greater than the maximum rotational speed of the drum during the rolling washing and is smaller than the maximum rotational speed of the drum during the wetting. According to claim 3,
A washing machine in which the control unit controls the driving unit after performing the tumbling washing to accelerate the drum at high speed so that the washing water soaked in the cloth is discharged. A water supply step of supplying wash water supplied from an external water source into the tub;
A wetting step of circulating the washing water supplied into the tub and rotating the drum in one direction at a speed that prevents the laundry contained in the drum from separating from the inner peripheral surface of the drum; and
A rolling washing step of rotating the drum in one direction so that the laundry rises and then rolls down along the inner peripheral surface of the drum while circulating the washing water supplied into the tub,
The washing water circulated in the wetting step is sprayed into the drum, rises beyond half the height of the drum, and then reaches the rear of the drum,
The washing water circulated in the rolling step is sprayed into the drum, rises to less than half the height of the drum, and then reaches the lower portion of the inner peripheral surface of the drum. According to claim 1,
Washing water circulated during the rolling wash is sprayed into the drum, rises to less than half the height of the drum, and then reaches the lower portion of the inner peripheral surface of the drum. According to claim 6,
A control method for a washing machine further comprising a tumbling washing step of circulating the washing water supplied into the tub after the rolling washing step and rotating the drum in one direction at a speed at which the fabric rises and then separates from the inner peripheral surface of the drum and falls. According to claim 8,
A washing machine control method further comprising a washing spin-drying step of accelerating the drum at a high speed so that the washing water soaked in the cloth drains after the tumbling washing step.

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