KR102257365B1 - Washing machine and control method thereof - Google Patents

Abstract

The washing machine according to the idea of the present invention provides a driving force to a tub in which washing water is stored, a rotating tub that is rotatably provided inside the tub, a pulsator that is rotatably provided under the rotating tub to form a washing water flow, and a pulsator The motor and the pulsator includes a floater that is provided so as to be able to rise and fall according to the level of washing water so as to interlock or release the pulsator and the rotating tank, and the pulsator includes a bottom surface of the pulsator for reinforcing stiffness. It includes a reinforcing rib protruding from, and the plotter is coupled to the reinforcing rib to rise and fall along the reinforcing rib, so that the driving force of the motor can alternatively be transmitted only to the pulsator or to the pulsator and the rotating tank with a simple structure. .

Description

Washing machine and its control method {WASHING MACHINE AND CONTROL METHOD THEREOF}

The present invention relates to a washing machine having a clutch device that selectively transmits a driving force of a motor only to a pulsator or to a pulsator and a rotating tank together, and a control method thereof.

The washing machine has a main body forming the exterior, a tub provided inside the main body to store washing water, a rotating tub that is rotatably provided inside the tub to receive laundry, and a rotating tub that is rotatably provided under the rotating tub to generate washing water. Equipped with a pulsator for washing laundry, a motor that generates driving force, a washing shaft that transmits the driving force of the motor to the pulsator, and a deshrink shaft having a hollow to rotatably support the rotating tub and into which the washing shaft is inserted, It is a household appliance that launders and dehydrates laundry.

In the washing process of the washing machine, when the motor is driven, the driving force of the motor is transmitted to the pulsator through the washing shaft, and laundry can be washed by the washing water flow generated by the rotation of the pulsator. In the spin-drying stroke of the washing machine, when the motor is driven, the driving force of the motor is transmitted to the pulsator and the rotary tub together through the washing shaft and the spin-drying shaft, so that the pulsator and the rotary tub rotate together and the laundry is dehydrated.

To this end, the washing machine is provided with a clutch device for transmitting the driving force of the motor only to the pulsator or to the pulsator and the rotating tank.

One aspect of the present invention discloses a washing machine having a clutch device capable of switching power using only the buoyancy of washing water without a separate actuator.

One aspect of the present invention discloses a washing machine having a simple clutch structure by using the shape of a conventional pulsator.

An aspect of the present invention discloses a washing machine having a buoyant clutch device with improved operational reliability.

A washing machine according to the present invention includes a tub for storing washing water; and a rotating tub rotatably provided inside the tub; and a pulsator rotatably provided under the rotating tub to form a washing water flow; and, A motor providing a driving force to the pulsator; And a floater provided to be able to rise and fall according to the level of washing water so as to interlock or release the pulsator and the rotating tub, wherein the pulsator includes a pulsator for reinforcing stiffness. And a reinforcing rib protruding from a bottom surface, and the floater is coupled to the reinforcing rib so as to rise and fall along the reinforcing rib.

The plotter may include a guide groove into which the reinforcing rib is inserted so as to rise and fall along the reinforcing rib.

The reinforcing rib may be formed in a radial shape.

The reinforcing rib may extend from the shaft coupling portion of the pulsator to the edge portion of the pulsator.

The pulsator may include an edge rib protruding from a bottom surface of the pulsator and formed along a circumferential direction at an edge portion of the pulsator, and the reinforcing rib may be supported in contact with the edge rib.

The pulsator may include an inner rib and an outer rib protruding from the bottom of the pulsator and formed along a circumferential direction to support the inner and outer side portions of the plotter, respectively.

The reinforcing rib may be provided to cross the inner rib and the outer rib.

The pulsator may include a reinforcing rib to accommodate the plotter, and a plotter accommodation space formed between the inner rib and the outer rib.

The plotter accommodating space may be sealed to prevent foreign matter from penetrating when the plotter is raised.

The plotter may include the inner rib, an inner flange portion, and an outer flange portion respectively contacting the outer rib so as to seal the floater accommodation space when ascending.

The pulsator may include an air discharge hole provided to allow air in the plotter accommodation space to escape when the plotter is raised.

The plotter may be provided to make line contact with the reinforcing rib.

The plotter may include a convex portion protruding toward the reinforcing rib so as to be in line contact with the reinforcing rib.

The pulsator may include an auxiliary guide rail formed on at least one of the reinforcing rib, the inner rib, and the outer rib to guide the upward and downward motion of the floater.

The plotter may include a rail groove into which the auxiliary guide rail is inserted so as to rise and fall along the auxiliary guide rail.

The washing machine may further include a coupler that is separated from the plotter when the plotter is raised and connected to the plotter when the plotter is lowered to receive a rotational force.

The washing machine further includes a driving flange coupled to the rotating tub and a flange shaft having a dehydration shaft rotatably supporting the driving flange, and the coupler may be fixed to the driving flange.

The plotter includes a plotter linkage part provided on the bottom of the plotter to transmit rotational force by being connected to the coupler when the plotter descends, and the coupler is connected to the plotter linkage part when the plotter descends to receive rotational force. May contain wealth.

The plotter linkage part may include an linkage tooth protruding from a bottom surface of the plotter.

The interlocking teeth may include inclined surfaces formed on the left and right based on a center line along a radial direction.

The coupler interlocking unit may include an interlocking slot into which the interlocking teeth are inserted.

The coupler may include a guide surface formed to be inclined between adjacent interlocking slots so as to guide the interlocking teeth to the interlocking slot when the floater is lowered.

The coupler may include a water drainage passage for draining the washing water stored in the interlocking slot to the outside of the interlocking slot.

The coupler interlocking part may include a corresponding tooth provided to engage the interlocking tooth when the plotter is lowered.

In another aspect, according to the idea of the present invention, a washing machine includes a tub for storing washing water; and a rotating tub rotatably provided inside the tub; and a pulsator which is rotatably provided under the rotating tub to form a washing water flow. And, a motor that provides a driving force to the pulsator; And a floater coupled to the bottom of the pulsator so as to interlock or release the pulsator and the rotating tub according to the level of the washing water, and wherein the pulsator is the plotter. And a plotter accommodation space formed on a bottom surface of the pulsator to accommodate, and the plotter accommodation space may be provided to be sealed by the plotter when the plotter is raised.

The pulsator is a reinforcing rib protruding from the bottom of the pulsator and formed in a radial shape, and protruding from the bottom of the pulsator and formed along a circumferential direction to support the inner and outer sides of the plotter, respectively. It includes an inner rib and an outer rib, and the plotter accommodation space may be formed by the reinforcing rib, the inner rib, and the outer rib.

The plotter may include the inner rib, an inner flange portion and an outer flange portion respectively in close contact with the outer rib to seal the space for accommodating the floater when rising.

The pulsator may include an air discharge hole provided to discharge air of the plotter accommodation space when the plotter is raised.

In another aspect, according to the idea of the present invention, a washing machine includes a tub for storing washing water; and a rotating tub that is rotatably provided inside the tub; and a pulse that is rotatably provided under the rotating tub to form a washing water flow. Eater; And, a motor for generating a driving force; And, a drainage device for discharging the washing water of the tub to the outside; And, a water level detection unit for sensing the water level of the tub; And, an input unit for receiving a user command; And, The A floater provided inside the tub to transmit the driving force of the motor to the pulsator and the rotating tub while rising and falling according to the water level of the tub; And a control unit configured to operate the drainage device according to a water level of the tub detected by the water level detection unit when a command to turn off the washing machine or a command to stop the operation of the washing machine is input to the input unit. Includes.

When the power-off command of the washing machine is input to the input unit, the control unit determines whether the water level of the tub is higher than a predetermined reference water level, and operates the drainage device when the water level of the tub is higher than a predetermined reference water level. After draining the washing water, you can turn off the washing machine.

When an operation stop command of the washing machine is input to the input unit, the control unit counts the elapsed time after receiving the operation stop command input, and determines whether the water level of the tub is higher than a predetermined reference water level when a predetermined time elapses, When the water level of the tub is higher than a predetermined reference water level, the water drainage device may be operated to discharge the washing water of the tub.

The control method of a washing machine according to an embodiment of the present invention receives a power-off command or an operation stop command from a user; Detecting the water level of the tub; Determining whether the water level of the tub is higher than a predetermined reference water level; And discharging the washing water of the tub to the outside when the water level of the tub is higher than the predetermined reference water level.

The control method of the washing machine may include turning off the washing machine when the washing water is discharged from the tub.

The control method of the washing machine may include counting an elapsed time after receiving an operation stop command from a user, and detecting a water level of the tub when a predetermined time elapses.

According to the idea of the present invention, a clutch device that selectively transmits only the pulsator or transmits the pulsator and the rotating tank together does not require an actuator and can be operated simply by using only the buoyancy of the washing water. Costs can be reduced and the process can be simplified.

According to the idea of the present invention, since the plotter is provided to rise and fall along the reinforcing ribs for reinforcing the stiffness of the pulsator, there is no need to process additional shapes on the pulsator, and the structure of the pulsator is simple.

According to the idea of the present invention, the plotter accommodation space is provided to be sealed by the plotter when the plotter is raised, and the pulsator is formed with an air discharge hole to allow the air in the plotter accommodation space to escape, so that the plotter can operate more stably.

According to the idea of the present invention, it is possible to prevent the floater located in the tub from being unintentionally exposed to washing water for a long period of time, causing scale or moss, and thus deteriorating the reliability of the full rotor.

1 is a cross-sectional view schematically showing a washing machine according to an embodiment of the present invention.
2 is a cross-sectional view showing a clutch device of the washing machine of FIG. 1;
3 is an exploded perspective view showing an exploded clutch device of the washing machine of FIG. 1.
4 is a bottom exploded perspective view showing the clutch device of the washing machine of FIG. 1 in an exploded view.
Figure 5 is a view showing the bottom of the pulsator of the washing machine of Figure 1;
6 is a perspective view showing a plotter of the washing machine of FIG. 1;
7 is a cross-sectional view showing a plotter of the washing machine of FIG. 1;
8 is an exploded view of the plotter of the washing machine of FIG. 1;
9 is a view showing a coupler and a flange shaft of the washing machine of FIG. 1;
FIG. 10 is a view for explaining the operation of the plotter of the washing machine of FIG. 1, and is a view illustrating a state in which the plotter and the coupler are separated due to the rise of the plotter in the washing process.
FIG. 11 is a view for explaining the operation of the plotter of the washing machine of FIG. 1, and is a diagram illustrating a state in which the plotter and the coupler are coupled as the plotter descends in the spin-drying process.
12 is a view showing the bottom of the pulsator according to another embodiment of the present invention.
13 is a view showing a plotter according to another embodiment of the present invention.
Fig. 14 is a plan sectional view for explaining a line contact structure between the plotter of Fig. 13 and the reinforcing ribs of the pulsator.
15 is a side cross-sectional view for explaining a structure in which the plotter accommodation space of the pulsator is sealed by the plotter of FIG. 13;
16 is a view showing a coupler according to another embodiment of the present invention.
17 is a view showing the bottom of the pulsator according to another embodiment of the present invention.
18 is an enlarged perspective view of the bottom of the pulsator of FIG. 17;
19 is a view showing a plotter according to another embodiment according to the present invention.
A perspective view showing the appearance of the washing machine of FIG. 1 of FIG. 20.
21 is a view schematically showing the interior of a washing machine according to another embodiment of the present invention.
22 is a view schematically showing the interior of a washing machine according to another embodiment of the present invention.
23 is a control block diagram according to an embodiment of the present invention.
24 is a control flow diagram according to an embodiment of the present invention.
25 is a control flowchart according to another embodiment of the present invention.

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

1 is a schematic cross-sectional view of a washing machine according to an embodiment of the present invention. 2 is a cross-sectional view illustrating a clutch device of the washing machine of FIG. 1. 3 is an exploded perspective view showing an exploded clutch device of the washing machine of FIG. 1. 4 is a bottom exploded perspective view showing the clutch device of the washing machine of FIG. 1 by exploding.

1 to 4, the washing machine 1 includes a main body 10 forming an exterior, a tub 11 disposed inside the main body 10 and storing washing water, and an interior of the tub 11 A rotating tub 20 rotatably installed in the rotating tub 20, a pulsator 40 rotatably installed under the rotating tub 20 to generate a washing water flow, a motor 13 generating a driving force, and a motor ( It includes a clutch device 60 that selectively transmits the driving force of 13) only to the pulsator 40 or to the pulsator 40 and the rotating tub 20 together.

The main body 10 may have a substantially box shape with an open upper surface, and a door 8 may be coupled to the main body 10 to open and close the open upper surface. The door 8 may be hinged to the body 10 so as to be rotatable.

The tub 11 may be installed inside the main body 10 through a suspension device 12. The tub 11 may have an approximately cylindrical shape. A water supply device 2 for supplying washing water to the tub 11 is provided on the upper side of the tub 11, and the washing water of the tub 11 is discharged to the outside of the main body 10 under the tub 11 A drainage device 5 for doing so may be provided. The water supply device 2 may include a water supply pipe 3 connected to an external water supply source, and a water supply valve 4 that opens and closes the water supply pipe 3. The drainage device 5 may include a drain pipe 6 and a drain valve 7 that opens and closes the drain pipe 6.

The rotating tub 20 may include a cylindrical portion 21 having a cylindrical shape and a bowl portion 23 coupled to a lower portion of the cylindrical portion 21. A through hole 22 through which washing water of the tub 11 can flow in and out may be formed in the cylindrical portion 21. The bowl part 23 forms the bottom of the rotating tub 20 and has a hollow 24 so that a washing shaft 57 and a dehydration shaft 27 to be described later pass through.

The motor 13 includes a stator 14 fixed to the bottom of the tub 11 and a rotor 16 that rotates forward and backward by interacting with the stator 14. The rotor 16 may be disposed outside the stator 14 in the radial direction. The stator 14 may include a coil 15 that generates a magnetic field when current is applied, and the rotor 16 may include a magnet 17 that interacts with the coil 14. The lower end of the washing shaft 57 is coupled to the center of the rotor 16, and when the rotor 16 rotates, the washing shaft 57 may rotate together. A pulsator 40 that generates washing water is coupled to an upper end of the washing shaft 57. Accordingly, the washing shaft 57 may transmit the rotational force generated by the motor 13 to the pulsator 40. The washing shaft 57 may be rotatably supported by bearings 28 and 29 (FIG. 1).

The pulsator 40 is rotatably provided in the lower portion of the rotating tub 20. The pulsator 40 is rotatably supported by the washing shaft 57. The pulsator 40 may have an approximately disk shape. A shaft coupling portion 41 to which the washing shaft 57 is coupled is formed in the central portion of the pulsator 40. A serration 42 may be formed on the inner side of the shaft coupling part 41, and a serration 58 may be formed on the outer side of the washing shaft 57 to be coupled thereto.

On the upper surface 43 of the pulsator 40, a rotating blade 44 may be formed in a radial shape so as to generate a washing water flow when the pulsator 40 is rotated. A reinforcing rib 46 for reinforcing the rigidity of the pulsator 40 may be formed on the bottom surface 45 of the pulsator 40. Details of the reinforcing rib 46 will be described later.

The washing shaft 57 may be provided inside the dehydration shaft 27. That is, the deshrinkage 27 may have a hollow, and the washing shaft 57 may be inserted through the hollow of the deshrinkage 27. The washing shaft 57 may have a length greater than that of the dehydration shaft 27. Bearings 55 and 56 (FIG. 2) may be provided between the washing shaft 57 and the dehydration shaft 27.

The flange shaft 26 (FIG. 2) includes a dehydration shaft 27 and a drive flange 31. The dehydration shaft 27 and the driving flange 31 may be provided separately and may be coupled to each other. Alternatively, the de-shrinkage 27 and the driving flange 31 may be integrally formed.

The driving flange 31 is fixed to the bowl part 23 of the rotating tub 20 by extending radially outward from the hub part 32 (FIG. 3) to which the dehydration shaft 27 is fixedly coupled, and the hub part 32 (). It may include an arm portion 34 (FIG. 3) to be coupled. The arm portion 34 may be firmly fixed to the bowl portion 23 of the rotating tub 20 through a fastening member such as a screw. In the present embodiment, six arm portions 34 are provided, but the number of arm portions 34 is not limited thereto. With this configuration, the flange shaft 26 can stably support the rotating tub 20 to be rotatable, and the rotating tub 20 can be maintained in a freely rotatable state.

The clutch device 60 allows the driving force of the motor 13 to alternatively be transmitted only to the pulsator 40 or to the pulsator 40 and the rotating tub 20 together. The clutch device 60 is provided between the pulsator 40 and the flange shaft 26 so as to interlock or release the pulsator 40 with the rotating tub 20 and rise or fall according to the water level. ,floater). That is, the floater 61 rises due to the buoyancy of the washing water when the tub 11 is filled with the washing water, and descends due to its own weight when the washing water of the tub 11 is drained.

When the water level of the washing water of the tub 11 is lowered and the floater 61 is lowered, the pulsator 40 and the rotating tub 20 may be interlocked. Conversely, when the water level of the washing water of the tub 11 rises and the floater 61 rises, the linkage between the pulsator 40 and the rotary tub 20 may be released.

The plotter 61 may be coupled to the reinforcing rib 46 of the pulsator 40 so as to rise and fall along the reinforcing rib 46 of the pulsator 40. In this way, since the plotter 61 is coupled to the reinforcing rib 46 of the pulsator 40 so as to rise and fall, there is no need to provide an additional structure for coupling the plotter 61 to the pulsator 40, and the pulsator The structure of (40) can be simplified. The coupling structure of the pulsator 40 and the plotter 61 and the interlocking structure of the pulsator 40 and the rotating tub 20 will be described in detail below.

5 is a view showing the bottom of the pulsator of the washing machine of FIG. 1. 6 is a perspective view illustrating a plotter of the washing machine of FIG. 1. 7 is a cross-sectional view illustrating a plotter of the washing machine of FIG. 1. 8 is an exploded view showing the plotter of the washing machine of FIG. 1. 9 is a view showing a coupler and a flange shaft of the washing machine of FIG. 1.

5 to 8, reinforcing ribs 46 for reinforcing the rigidity of the pulsator 40 are formed on the bottom surface 45 of the pulsator 40. The reinforcing rib 46 may be integrally formed with the pulsator 40. The reinforcing rib 46 may protrude downward from the bottom surface 45 of the pulsator 40. The reinforcing rib 46 may be formed in a radial shape. That is, the reinforcing rib 46 may extend outward along the radial direction from the shaft coupling portion 41 of the pulsator 40. The reinforcing rib 46 may extend from the shaft coupling portion 41 of the pulsator 40 to the edge portion of the pulsator 40.

Edge ribs 47 may be formed along the circumferential direction at the rim of the bottom surface 45 of the pulsator 40, and the reinforcing ribs 46 may be supported in contact with the edge ribs 47. Accordingly, the rigidity of the reinforcing rib 46 may be reinforced.

In this embodiment, the reinforcing rib 46 is formed to be point symmetric around the shaft coupling part 41, but is not limited thereto. In the present embodiment, 12 reinforcing ribs 46 are provided so as to be spaced apart from each other at a predetermined interval, but the number of reinforcing ribs 46 is not limited.

An inner rib 48 and an outer rib 49 may be formed on the inner side of the bottom surface 45 of the pulsator 40 along the circumferential direction. The inner rib 48 and the outer rib 49 form a concentric circle, and the outer rib 49 has a larger radius than the inner rib 48.

The inner rib 48 and the outer rib 49 may intersect the reinforcing rib 46. Accordingly, a plotter accommodation space 50 for accommodating the plotter 61 may be formed by the reinforcing ribs 46, the inner ribs 48, and the outer ribs 49. In this embodiment, 12 plotter accommodation spaces 50 are formed along the circumferential direction, but there is no limit to the number of plotter accommodation spaces 50.

The plotter 61 may be accommodated in the plotter accommodation space 50. In spite of the rise and fall of the plotter 61, the plotter 61 must be provided so that at least a portion of the plotter 61 is accommodated in the plotter accommodation space 50. Because, even when the plotter 61 descends, at least a part of the plotter 61 must be accommodated in the plotter accommodation space 50 so that the rotational force of the pulsator 40 is transmitted to the plotter 61 through the reinforcing rib 46. Because it can. With this configuration, the plotter 61 may rotate together with the pulsator 40 by being constrained by the rotational motion of the pulsator 40 whether in an elevated or lowered state.

The inner rib 48 may support the inner surface portion 63 of the plotter 61 to be movable, and the outer rib 49 may support the outer surface portion 64 of the plotter 61 to be movable ( 10 and 11).

In the pulsator 40, when the plotter 61 ascends from the plotter accommodation space 50, air in the plotter accommodation space 50 is discharged to facilitate the upward movement of the plotter 61. 5) can be formed.

The plotter 61 may have a substantially cylindrical shape having a hollow so that the washing shaft 57 and the deshrink shaft 27 pass. The plotter 61 rises and descends along the reinforcing ribs 46 of the pulsator 40, and the reinforcing ribs of the pulsator 40 so that rotational force is transmitted from the reinforcing ribs 46 of the pulsator 40. It has a guide groove 65 into which 46 is inserted. The guide groove 65 may be formed as many as the number of reinforcing ribs 46 along the circumferential direction.

When the pulsator 40 rotates, the reinforcing rib 46 presses the side portion 66 of the guide groove 65 of the plotter 61, so that the plotter 61 can rotate together with the pulsator 40. The reinforcing rib 46 and the guide groove side portion 66 should be provided to be spaced apart at appropriate intervals so that the plotter 61 can smoothly move up and down. This is because if the distance between the guide groove side portion 66 and the reinforcing rib 46 is large, the noise during collision increases, and if the distance is small, the ascending and descending motion may not be smooth due to friction. For example, the guide groove side portion 66 and the reinforcing rib 46 may be spaced apart at intervals of 0.2 mm to 0.4 mm.

The plotter 61 may be formed of various materials such as a resin material, and an empty space 69 may be formed therein to reduce weight.

The plotter 61 may be integrally formed, or may be formed by combining the upper plotter 62 (FIG. 8) and the lower plotter 70 (FIG. 8). A guide groove 65 may be formed in the upper plotter 62, and a plotter linking part to be described later may be formed in the lower plotter 70.

The clutch device 60 may further include a coupler 81 that is separated from the plotter 61 when the plotter 61 rises, and is connected to the plotter 61 when the plotter 61 descends to receive a rotational force. have. The coupler 81 may be fixed to the driving flange 31 of the flange shaft 26. The coupler 81 may be firmly coupled to the driving flange 31 through a fastening member S such as a screw.

The coupler 81 may have an approximately disk shape. The coupler 81 may have an inner edge portion 82 and an outer edge portion 83 formed along the circumferential direction.

The plotter 61 may have a plotter linkage that is connected to the coupler 81 when descending to transmit rotational force. The coupler 81 may have a coupler linkage that is connected to the plotter linkage and receives a rotational force.

The plotter linkage unit and the coupler linkage unit may include various coupling structures capable of transmitting power. For example, the plotter linkage part may be an interlocking tooth 72 (FIG. 8) protruding from the bottom of the plotter 61, and the coupler linkage part may be an interlocking slot 85 (FIG. 9) into which the interlocking tooth 72 is inserted.

The interlocking teeth 72 may be provided in a predetermined number so as to be spaced apart from each other along the circumferential direction. The interlocking slots 85 may be provided in a predetermined number so as to be spaced apart from each other along the circumferential direction. The number of the interlocking teeth 72 and the interlocking slots 85 need not be the same, and it is sufficient if the number of interlocking slots 85 is greater than the number of interlocking teeth 72.

To facilitate insertion of the interlocking teeth 72 into the interlocking slots 85, the interlocking teeth 72 may include inclined surfaces 74 and 75 respectively formed on the left and right based on the center line 73 along the radial direction. . In addition, the coupler 81 may have guide surfaces 87 and 88 formed to be inclined between adjacent interlocking slots 85 to guide the interlocking teeth 72 to the interlocking slot 85. The guide surfaces 87 and 88 may be formed on the left and right sides based on the center line 86 along the radial direction. With this configuration, when the plotter 61 descends, the interlocking teeth 72 can be easily inserted into the interlocking slot 85 regardless of the relative positions of the interlocking teeth 72 and the interlocking slots 85.

The coupler 81 may have a water drainage passage 89 that communicates the inside and the outside of the interlocking slot 85 so that the washing water stored in the interlocking slot 85 is not collected in the interlocking slot 85 and escapes to the outside. . The water drainage passage 89 may be formed to pass through the outer edge portion 83 of the coupler 81. The water drainage passage 89 is provided so as to be inclined downwardly toward the outer side in the radial direction, and the washing water stored in the interlocking slot 85 may flow to the water drainage passage 89 by its own weight.

However, unlike the present embodiment, the water drainage passage 89 is formed to pass through the inner edge portion 82 of the coupler 81, and may be provided to be inclined downward toward the inner side in the radial direction. Since the interlocking slot 85 is maintained in a state where washing water is not stored by the water drainage passage 89, the interlocking teeth 72 of the plotter 61 can be smoothly inserted into the interlocking slot 85.

In this embodiment, the coupler 81 is separately provided and assembled from the driving flange 31, but, unlike this, the coupler 81 and the driving flange 31 may be integrally provided.

FIG. 10 is a view for explaining the operation of the plotter of the washing machine of FIG. 1, and is a diagram illustrating a state in which the plotter and the coupler are separated by the rise of the plotter in the washing process. FIG. 11 is a view for explaining the operation of the plotter of the washing machine of FIG. 1, and is a diagram illustrating a state in which the plotter and the coupler are coupled as the plotter descends in the spin-drying process.

An operation of a plotter of a washing machine according to an embodiment of the present invention will be described with reference to FIGS. 10 to 11.

As shown in FIG. 10, in the washing process of the washing machine, when the tub is filled with washing water, the plotter 61 rises due to the buoyancy of the washing water. The plotter 61 may rise along the reinforcing rib on the bottom of the pulsator 40. The inner side 63 and the outer side 64 of the plotter 61 may be guided by the inner rib 48 and the outer rib 49 of the bottom of the pulsator 40, respectively.

When the plotter 61 rises, the connection between the plotter 61 and the coupler 81 is released, and as a result, the linkage between the pulsator 40 and the rotary tub 20 may be released. Therefore, when the motor is driven, rotational force is transmitted only to the pulsator 40 through the washing shaft 57, so that only the pulsator 40 rotates and the rotating tub 20 does not rotate.

As shown in FIG. 11, in the spin-drying process of the washing machine, when the washing water of the tub is drained, the plotter 61 descends due to its own weight. The plotter 61 may descend along the reinforcing rib on the bottom of the pulsator 40. The inner side 63 and the outer side 64 of the plotter 61 may be guided by the inner rib 48 and the outer rib 49 of the bottom of the pulsator 40, respectively. Even if the plotter 61 descends, the plotter 61 does not completely depart from the plotter accommodation space 50. That is, even in a state in which the plotter 61 is lowered, the plotter 61 may rotate together with the pulsator 40 by receiving a rotational force through the reinforcing rib when the pulsator 40 rotates.

In this way, when the plotter 61 descends, the plotter 61 and the coupler 81 are connected, and as a result, the pulsator 40 and the rotating tub 20 may be linked. Therefore, when the motor is driven, the rotational force is transmitted to the pulsator 40 through the washing shaft 57 so that the pulsator 40 rotates, and the rotational force of the pulsator 40 is transmitted to the rotating tub 20 (20) can rotate together.

12 is a view showing a bottom surface of a pulsator according to another embodiment of the present invention. 13 is a view showing a plotter according to another embodiment of the present invention. 14 is a plan cross-sectional view for explaining a line contact structure between the plotter of FIG. 13 and the reinforcing ribs of the pulsator. 15 is a side cross-sectional view for explaining a structure in which the plotter accommodation space of the pulsator is sealed by the plotter of FIG. 13. 16 is a view showing a coupler according to another embodiment of the present invention.

A pulsator, a plotter, and a coupler according to another embodiment of the present invention will be described with reference to FIGS. 12 to 16. The same reference numerals are assigned to the same configurations as those of the above-described embodiment, and description may be omitted.

Reinforcing ribs 246 for reinforcing the rigidity of the pulsator 240 are formed on the bottom surface 245 of the pulsator 240. The reinforcing rib 246 may protrude downward from the bottom surface 245 of the pulsator 240. The reinforcing rib 246 may be formed in a radial shape.

Some of the reinforcing ribs 246 (246a) may extend continuously from the shaft coupling portion 241 of the pulsator 240 to the edge portion of the pulsator 240. The remaining part 246b of the reinforcing ribs 246 may be formed only in the remaining section except for the section between the inner rib 248 and the outer rib 249. Accordingly, the plotter accommodation space 250 formed between the reinforcing ribs 246a, the inner ribs 248, and the outer ribs 249 may be provided as much as half of the total number of the reinforcing ribs 246.

The plotter 261 rises and falls along the reinforcing ribs 246a of the pulsator 240, and the reinforcing ribs of the pulsator 240 so as to receive rotational force from the reinforcing ribs 246a of the pulsator 240 It has a guide groove 265 into which (246a) is inserted.

The side portion 266 of the guide groove 265 may be provided to make line contact when contacting the reinforcing rib 246a. That is, the side portion 266 of the guide groove 265 may have a convex portion 267 protruding toward the reinforcing rib 246a. In the present embodiment, the convex portion 267 extends in a substantially vertical direction to the reinforcing rib 246a, but is not limited thereto, and may be extended in another direction such as a horizontal direction or a diagonal direction. Furthermore, the convex portion 247 may be provided to make point contact with the reinforcing rib 246a.

In this way, the convex portion 267 is formed on the side portion 266 of the guide groove 265 so that the plotter 261 and the reinforcing rib 246a are in line contact, so that the friction between the reinforcing rib 246a and the plotter 261 is Can be reduced and thus the noise can be reduced.

The convex portion 267 and the reinforcing rib 246a may be spaced apart at appropriate intervals for smooth ascending and descending motion of the plotter 261. This is because if the distance between the convex portion 267 and the reinforcing ribs 246a is large, noise during a collision increases, and if the distance is small, the ascending and descending motions may not be smooth due to friction. For example, the convex portion 267 and the reinforcing ribs 246a may be spaced apart from each other at intervals of 0.2 mm to 0.4 mm.

The plotter 261 includes an inner flange portion 268a in close contact with the inner rib 248 of the pulsator 240 when ascending, and an outer flange portion 268b in close contact with the outer rib 249 of the pulsator 240 Can have. The inner flange portion 268a may extend radially inward from the inner side surface portion 263 of the plotter 261. The outer flange portion 268b may extend radially outward from the outer surface portion 264 of the plotter 261. The inner flange portion 268a and the outer flange portion 268b may be formed under the plotter 261.

15, when the plotter 261 rises, the inner flange portion 268a is in close contact with the bottom of the inner rib 248 of the pulsator 240, and the outer flange portion 268b is the outer rib. Since it is in close contact with the bottom surface of the 249, the plotter accommodation space 250 may be sealed. Accordingly, lint included in the washing water can be prevented from penetrating into the plotter accommodation space 250, and reliability of the operation of the plotter 261 can be improved.

The plotter 261 may have a plotter linkage that is connected to the coupler 281 when descending to transmit a rotational force. The coupler 281 may have a coupler linkage that is connected to the plotter linkage to receive rotational force.

The plotter linkage unit and the coupler linkage unit may include various coupling structures capable of transmitting power. As an example, the plotter linkage part may be an interlocking tooth 272 protruding from the bottom of the plotter 261, and the coupler linkage part may be a corresponding tooth 285 meshing with the interlocking tooth 272. Since the interlocking teeth 272 is the same as the interlocking teeth 72 of the above-described embodiment, a description thereof will be omitted.

The corresponding teeth 285 may have a shape symmetrical to the interlocking teeth 272. The corresponding teeth 285 may protrude upward from the coupler body 282. The corresponding teeth 285 may include corresponding inclined surfaces 287 and 288 formed on the left and right based on the center line 286 along the radial direction. With this configuration, when the plotter 261 descends, the interlocking teeth 272 and the corresponding teeth 285 can be smoothly engaged regardless of the positions of the corresponding teeth 285.

The plotter 261 may be formed of various materials such as a resin material, and an empty space 269 may be formed therein to reduce weight.

Reference numeral 242 of FIG. 14 is a serration formed on the inner circumferential surface of the shaft coupling portion 241 of the pulsator 240 to couple the washing shaft.

17 is a view showing the bottom of a pulsator according to another embodiment of the present invention. 18 is an enlarged perspective view of the bottom of the pulsator of FIG. 17. 19 is a view showing a plotter according to another embodiment according to the present invention.

A pulsator and a plotter according to another embodiment of the present invention will be described with reference to FIGS. 17 to 18. The same reference numerals are assigned to the same configurations as those of the above-described embodiments, and descriptions may be omitted.

The pulsator 340 includes a reinforcing rib 346 protruding radially from the bottom surface 345 for reinforcing rigidity, and an inner rib 348 and an outer rib 349 formed in a circumferential direction to intersect the reinforcing rib 346 Can have. A floater accommodation space 350 may be formed between the reinforcing rib 346, the inner rib 348, and the outer rib 349.

The reinforcing rib 346 may be inserted into the guide groove 365 of the plotter 361 to guide the upward and downward movement of the plotter 361 and apply a rotational force to the plotter 361. The inner rib 348 and the outer rib 349 may movably support the inner side 363 and the outer side 364 of the plotter 361, respectively.

The pulsator 340 may further include an auxiliary guide rail 348a for guiding the upward and downward movement of the plotter 361. The auxiliary guide rail 348a may be formed to protrude from the inner rib 348 toward the plotter accommodation space 350. However, the present invention is not limited thereto, and the auxiliary guide rail 348a may be formed to protrude from the outer rib 349 or the reinforcing rib 346 toward the plotter accommodation space 350.

It is sufficient if the auxiliary guide rail 348a is provided to extend in the vertical direction, and there is no limitation on its shape.

The plotter 361 rises and descends along the reinforcing ribs 346 of the pulsator 340, and the reinforcing ribs of the pulsator 340 so as to receive rotational force from the reinforcing ribs 346 of the pulsator 340. It may have a guide groove 365 into which the 346 is inserted, and a rail groove 363a into which the auxiliary guide rail 348a is inserted so as to rise and fall along the auxiliary guide rail 348a.

In this embodiment, the rail groove 363a is formed on the inner side portion 363 of the plotter 361, but is not limited thereto, and the outer side portion 364 of the plotter 361 or the side portion 366 of the guide groove 365 ) May be formed. By the auxiliary guide rail (348a) and the rail groove (363a), the upward and downward movement of the plotter 361 may be made more stably.

Reference numeral 347 of FIG. 14 is an edge rib formed on the bottom edge of the pulsator 340.

20 is a perspective view showing the appearance of the washing machine of FIG. 1.

As shown in FIG. 20, the washing machine 1 displays an input unit 30 for receiving a user's command related to various operations of the washing machine 1, power on and off, and an operation of the washing machine 1 It may include a display unit 25.

In the present embodiment, the input unit 30 is provided with the display unit 25 separately, but the input unit 30 may be provided integrally with the display unit 25 in the form of a touch panel.

The input unit 30 may include various buttons. The input unit 30 may include a power button 30a capable of turning on or off the washing machine 1. When the user presses the power button 30a, the washing machine 1 is turned on, and in this state, when the user presses the power button 30a again, the washing machine 1 may be turned off.

The input unit 30 may include an operation button 30b for executing and stopping the operation of the washing machine 1. When the user presses the operation button 30b, the washing machine 1 may perform a washing operation, a rinse operation, a spin-drying operation, and the like.

In the washing process and the rinsing process, the water supply device 2 may supply washing water into the tub 11. The motor 13 rotates to generate a driving force, and the driving force of the motor 13 is transmitted to the pulsator 40 so that the pulsator 40 may rotate. As the pulsator 40 rotates, a washing water flow is formed in the rotating tub 20, and accordingly, laundry may be washed or rinsed.

In the spin-drying process, the drainage device 5 may discharge the washing water inside the tub 11 to the outside. The motor 13 rotates to generate a driving force, and the driving force of the motor 13 may be transmitted to the pulsator 40 and the rotating tub 20. As the pulsator 40 and the rotating tub 20 rotate together at high speed, the washing water contained in the laundry may be removed.

Accordingly, when the user presses the operation button 30b, the water supply device 2, the motor 13, the drainage device 5, etc. required for each stroke may be driven or stopped.

21 is a view schematically showing the interior of a washing machine according to another embodiment of the present invention. 22 is a diagram schematically showing the interior of a washing machine according to another embodiment of the present invention. 23 is a control block diagram according to an embodiment of the present invention. 24 is a control flowchart according to an embodiment of the present invention. 25 is a control flowchart according to another embodiment of the present invention.

The washing machine may further include a water level detector 90 that detects the water level of the tub 11. The water level detection unit 90 may be provided in various configurations. For example, the water level detection unit 90 includes a water level detection tube 91 extending from a lower portion of the tub 11 to an upper portion of the main body 10, and a pressure sensor 92 that detects the pressure inside the water level detection tube 91 It may include.

When washing water is supplied into the tub 11, the washing water is also supplied to the water level detecting pipe 91 connected to the lower portion of the tub 11, and as the water level of the washing water contained in the tub 11 increases, the water level detecting pipe ( 91) will also increase. When the water level of the water level detection tube 91 increases, the air inside the water level detection tube 91 is compressed, so that the pressure inside the water level detection tube 91 increases.

The pressure sensor 92 may detect the pressure inside the water level detection tube 91.

The water level detection unit 90 may transmit an electrical signal corresponding to the pressure detected by the pressure sensor 92 to the control unit 200. The control unit 200 may determine the water level of the tub 110 based on the pressure inside the water level detection tube 91 received from the water level detection unit 90.

The drainage device 5 of the washing machine may be composed of a drain pipe 6 and a drain valve 7 as described above, but may alternatively be composed of a drain pipe 116 and a drain pump 117. The drainage pump 117 may include a housing (not shown) that accommodates washing water, an impeller (not shown) that pumps the washing water inside the housing, and a drain motor (not shown) that drives the impeller. By using the drainage pump 117, it is possible to forcibly drain the washing water to a higher position than the position of the tub 11.

The washing machine receives power from the outside and turns on or off the power of the entire washing machine, and a motor 13 that is electrically connected to the power supply 210 to rotate the pulsator 40 and the rotating tub 20 ) May include a motor driving unit 220 for supplying electricity.

The washing machine receives a user command and water level information of the tub 11 from the user input unit 30 and the water level detection unit 90, respectively, and based on this, the power supply unit 210, the motor drive unit 220, and the water supply unit 2 Wow, it may include a control unit 200 for controlling the drainage device (5).

In such a washing machine, the washing machine is unintentionally left for a long time while the washing water remains in the tub 11, so that the floater 61 located inside the tub 11 is exposed to the washing water for a long period of time, so that moss, It can be controlled to prevent scale and the like from occurring.

As shown in FIG. 24, when a power-off command is input to the input unit 30 (310), the water level detection unit 90 may detect the water level of the tub 11 (320).

The controller 200 may determine whether the water level of the tub 11 is higher than the reference water level by comparing the water level of the tub 11 detected by the water level detection unit 90 with the reference water level of the tub 11 set in advance (330). ). In this case, the reference water level may be 0. That is, it can be determined whether there is residual water in the tub 11.

When the water level of the tub 11 is higher than the reference water level, the control unit 200 may operate the drainage device 5 to discharge the washing water of the tub 11 to the outside (340). When the discharge of the washing water inside the tub 11 is completed, the controller 200 may control the power supply 210 to turn off the washing machine (350). If the water level of the tub 11 is not higher than the reference water level, the controller 20 may immediately control the power supply 210 to turn off the washing machine.

With this configuration, when a user inputs a power-off command to the input unit 30, the washing machine may not be turned off immediately, but after the washing water of the tub 11 is discharged to the outside, the washing machine may be turned off. Therefore, the power is turned off while the washing water remains in the tub 11, so that scale or moss occurs in the plotter 61 disposed inside the tub 11, thereby reducing the reliability of the operation of the plotter 61. Can be prevented.

This control method may be applied only when a power-off command is input during the washing or rinse cycle of the washing machine. This is because washing water is stored in the tub 11 during the washing process or the rinse process, and washing water is not stored in the tub 11 during the spin-drying process.

Meanwhile, as shown in FIG. 25, even when an operation stop command is input from a user, the washing machine may be controlled by a control method similar to the above control method.

When an operation stop command is input to the input unit 30 (410), the washing machine stops an ongoing operation (420), and a time elapsed after stopping the operation may be counted.

When the elapsed time reaches a predetermined reference time (430), the control unit 200 compares the water level of the tub 11 detected by the water level detection unit 90 with the reference water level of the tub 11 set in advance, and the tub ( It can be determined whether the water level of 11) is higher than the reference water level (440). In this case, the reference water level may be 0. That is, it can be determined whether there is residual water in the tub 11.

Next, when the water level of the tub 11 is higher than the reference water level, the control unit 200 may operate the drainage device 5 to discharge the washing water of the tub 11 to the outside (450). Furthermore, when the discharge of the washing water from the tub 11 is completed, the controller 200 may control the power supply 210 to turn off the washing machine.

If a command to resume the operation is input to the input unit 30 before the time elapsed in step 430 reaches a predetermined reference time, the ongoing operation may be resumed (470).

With this configuration, even if the user stops the operation of the washing machine for a while and leaves the washing machine unintentionally for a long period of time, the washing machine discharges the washing water of the tub 11 to the outside, thereby discharging the floater 61 disposed inside the tub 11 ) Can be prevented from being exposed to the washing water for a long period of time, thereby preventing the reliability of the operation of the plotter 61 from deteriorating.

Although the technical idea of the present invention as described above has been described by a specific embodiment, the scope of the present invention is not limited to this embodiment. Various embodiments that can be modified or modified by a person of ordinary skill in the art within the scope not departing from the gist of the technical idea of the present invention will also fall within the scope of the present invention.

1: washing machine 11: tub
13: motor 20: rotating tank
27: dehydration 31: drive flange
40,240,340: Pulsator 46,246a,246b,346: Reinforcing rib
47,247,347: edge rib 48,248,348: inner rib
49,249,349: outer rib 50,250,350: plotter accommodation space
51: air discharge hole 57: washing shaft
61,261,361: Plotter 65: Guide groove
72,272: interlocking teeth 81,281: coupler
85: interlocking slot 89: water drainage passage
268a, 268b: inner and outer flange portions 267: convex portions
285: corresponding teeth 348a: auxiliary guide rail
363a: Rail groove

Claims (34)

A tub in which washing water is stored;
A rotating tub rotatably provided inside the tub;
A pulsator provided rotatably under the rotating tank to form a washing water stream;
A motor providing a driving force to the pulsator; And
A floater provided to be able to rise and fall according to the level of wash water to link or release the pulsator and the rotating tub; Including,
The pulsator includes a reinforcing rib protruding from the bottom surface of the pulsator for reinforcing rigidity,
The floater is coupled to the reinforcing rib so as to rise and fall along the reinforcing rib,
The pulsator has an inner rib protruding from the bottom of the pulsator and formed along a circumferential direction to support the inner side of the plotter, and protruding from the bottom of the pulsator and along the circumferential direction to support the outer side of the plotter. It includes an outer rib that is formed,
The reinforcing rib is a washing machine, characterized in that provided to cross the inner rib and the outer rib. The method of claim 1,
Wherein the plotter includes a guide groove into which the reinforcing rib is inserted so as to rise and fall along the reinforcing rib. The method of claim 1,
The reinforcing rib is a washing machine, characterized in that formed in a radial (放射形). The method of claim 1,
The reinforcing rib is a washing machine, characterized in that extending from the shaft coupling portion of the pulsator to the rim portion of the pulsator. The method of claim 1,
The pulsator includes an edge rib protruding from the bottom of the pulsator and formed along a circumferential direction at an edge portion of the pulsator,
The reinforcing rib is a washing machine, characterized in that supported in contact with the edge rib. delete delete The method of claim 1,
The pulsator is a washing machine, characterized in that it comprises a reinforcement rib to accommodate the floater, a floater accommodation space formed between the inner rib and the outer rib. The method of claim 8,
The washing machine, wherein the plotter accommodation space is sealed to prevent foreign matter from penetrating when the plotter is raised. The method of claim 9,
Wherein the plotter includes the inner rib, an inner flange portion and an outer flange portion respectively in close contact with the outer rib so as to seal the floater accommodation space when ascending. The method of claim 8,
The pulsator is a washing machine, characterized in that it comprises an air discharge hole provided to escape the air of the plotter accommodating space when the floater is raised. The method of claim 1,
The floater is a washing machine, characterized in that provided to make line contact with the reinforcing rib. The method of claim 12,
Wherein the plotter includes a convex portion protruding toward the reinforcing rib so as to be in line contact with the reinforcing rib. The method of claim 1,
The pulsator includes an auxiliary guide rail formed on at least one of the reinforcing rib, the inner rib, and the outer rib to guide the rising and falling motion of the floater. The method of claim 14,
Wherein the floater includes a rail groove into which the auxiliary guide rail is inserted so as to rise and fall along the auxiliary guide rail. The method of claim 1,
And a coupler separated from the plotter when the plotter is raised and connected to the plotter when the plotter is lowered to receive a rotational force. The method of claim 16,
Further comprising a flange shaft having a drive flange coupled to the rotating tank and a de-shrink shaft rotatably supporting the drive flange,
The coupler is a washing machine, characterized in that fixed to the drive flange. The method of claim 16,
The plotter includes a plotter linkage part provided on the bottom of the plotter to transmit rotational force by being connected to the coupler when the plotter descends, and the coupler is connected to the plotter linkage part when the plotter descends to receive rotational force. A washing machine comprising a unit. The method of claim 18,
Wherein the plotter linkage portion includes an interlocking tooth protruding from a bottom surface of the plotter. The method of claim 19,
The interlocking tooth is a washing machine, characterized in that it comprises an inclined surface formed on the left and right based on a center line along a radial direction. The method of claim 19,
The coupler linkage unit, characterized in that the washing machine comprising an interlocking slot into which the interlocking teeth are inserted. The method of claim 21,
And the coupler includes a guide surface formed to be inclined between adjacent interlocking slots to guide the interlocking teeth to the interlocking slot when the floater is lowered. The method of claim 21,
The coupler is a washing machine, characterized in that it comprises a water drainage passage for draining the washing water stored in the interlocking slot to the outside of the interlocking slot. The method of claim 19,
The coupler interlocking unit comprises a corresponding tooth provided to engage the interlocking tooth when the plotter is lowered. A tub in which washing water is stored;
A rotating tub rotatably provided inside the tub;
A pulsator provided rotatably under the rotating tank to form a washing water stream;
A motor providing a driving force to the pulsator; And
A floater coupled to the bottom of the pulsator so as to interlock or release the pulsator and the rotating tank in an ascending and descending manner according to the level of washing water; Including,
The pulsator includes a plotter accommodation space formed on the bottom of the pulsator to accommodate the plotter,
The washing machine, wherein the plotter accommodation space is provided to be sealed by the plotter when the plotter is raised. The method of claim 25,
The pulsator is a reinforcing rib protruding from the bottom of the pulsator and formed in a radial shape, and a reinforcing rib protruding from the bottom of the pulsator and formed along a circumferential direction to support the inner and outer sides of the plotter, respectively. Including an inner rib and an outer rib,
The floater accommodation space is a washing machine, characterized in that formed by the reinforcing rib, the inner rib, and the outer rib. The method of claim 26,
And the floater includes the inner rib, an inner flange portion contacting the outer rib, and an outer flange portion to seal the floater accommodation space when the floater is raised. The method of claim 25,
The pulsator is a washing machine, characterized in that it comprises an air discharge hole provided to discharge the air of the plotter accommodating space when the floater is raised. A tub in which washing water is stored;
A rotating tub rotatably provided inside the tub;
A pulsator provided rotatably under the rotating tank to form a washing water stream;
A motor generating a driving force;
A drainage device for discharging the washing water of the tub to the outside;
A water level detector for detecting the water level of the tub;
An input unit for receiving a user command;
A floater provided inside the tub to transmit the driving force of the motor to the pulsator and the rotating tub while rising and falling according to the water level of the tub; And
A control unit for operating the drainage device according to a water level of the tub detected by the water level detection unit when a command for turning off the washing machine or a command for stopping the operation of the washing machine is input to the input unit; Including,
The pulsator is,
A reinforcing rib protruding from the bottom of the pulsator for reinforcing rigidity;
An inner rib protruding from the bottom of the pulsator and formed along a circumferential direction to support the inner side of the plotter; And
Including; an outer rib protruding from the bottom surface of the pulsator and formed along the circumferential direction to support the outer surface portion of the plotter,
The reinforcing rib is a washing machine, characterized in that provided to cross the inner rib and the outer rib. The method of claim 29,
When the power-off command of the washing machine is input to the input unit, the control unit determines whether the water level of the tub is higher than a predetermined reference water level, and when the water level of the tub is higher than a predetermined reference water level, the drain device is operated to wash the tub. A washing machine, characterized in that the power of the washing machine is turned off after the water is discharged. The method of claim 29,
When an operation stop command of the washing machine is input to the input unit, the control unit counts the elapsed time after receiving the operation stop command input, and determines whether the water level of the tub is higher than a predetermined reference water level when a predetermined time elapses, A washing machine, characterized in that, when the water level of the tub is higher than a predetermined reference water level, the drainage device is operated to discharge the washing water of the tub. delete delete delete

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