KR102477943B1 - Method for controlling washing machine - Google Patents

Abstract

The present invention relates to an outer tub containing wash water, an inner tub accommodating laundry and rotatably provided in the outer tub, a discharge pipe for discharging water in the outer tub, and a variable speed pump connected to the discharge pipe. A washing machine including a pump) and at least one nozzle connected to the pump through a circulating water guide pipe and injecting water guided through the circulating water guide pipe into the inner tub, and a control method thereof. In particular, the control method includes (a) supplying water into the outer tank by controlling at least one water supply valve, (b) at a first speed at which water pumped by the pump does not reach the at least one nozzle; and operating the pump at a second speed at which water pumped by the pump is sprayed through the at least one nozzle.

Description

Control method of washing machine {METHOD FOR CONTROLLING WASHING MACHINE}

The present invention relates to a control method for a washing machine using a variable speed pump.

In general, a washing machine is a device that separates contaminants from clothes, bedding, etc. (hereinafter, abbreviated as 'laundry') by using physical actions such as chemical decomposition of water and detergent and friction between water and laundry. it is called

In order to improve washing power and to prevent stains on laundry due to detergent, it is necessary to evenly dissolve the detergent added together with water. Due to this need, conventionally, a method of dissolving the detergent while circulating the detergent along with water by additionally configuring a flow path for dissolving the detergent separately from the flow path for supplying water to the nozzle has been developed, but this method has a structure In addition to being complex, there was a problem of increasing manufacturing cost.

The problem to be solved by the present invention is, first, to provide a washing machine capable of evenly mixing detergent and water using a variable-speed circulation pump and a control method thereof.

Second, it is to provide a washing machine and a control method thereof preventing contamination of laundry due to coagulation of detergent by preventing undissolved detergent from being applied to laundry.

Third, based on the structure of circulating wash water in the outer tub and spraying it through a nozzle, by varying the speed of the circulation pump circulating the wash water, dissolving the detergent and circulating the wash water according to the speed of the circulation pump An object of the present invention is to provide a washing machine that can be selectively implemented and a control method thereof.

The present invention relates to an outer tub containing wash water, an inner tub accommodating laundry and rotatably provided in the outer tub, a discharge pipe for discharging water in the outer tub, and a variable speed pump connected to the discharge pipe. A washing machine including a pump, and at least one nozzle connected to the pump through a circulating water guide pipe and injecting water guided through the circulating water guide pipe into the inner tub, and a control method thereof.

The control method comprises: supplying water into the outer tank by controlling at least one water supply valve; operating the pump at a first speed at which water pumped by the pump does not reach the at least one nozzle; and driving the pump at a second speed at which water pumped by the pump is sprayed through the at least one nozzle.

Alternatively, the at least one nozzle may include a first nozzle and a second nozzle respectively provided in a first area and a second area on both sides of a vertical line passing through the center of the inner tub, and the control method may include at least one nozzle. supplying water into the outer tub by controlling a water supply valve; controlling the pump at a roll-down speed set within a range where the water flows along the other part of the inner tub belonging to the second region; and operating the pump at a speed higher than the roll-down speed.

The washing machine includes a control unit enabling the above control.

The washing machine and its control method of the present invention have an effect of evenly dissolving the detergent in water using a circulation pump without adding a separate mechanism for dissolving the detergent.

Second, since the detergent is applied to the laundry after it is sufficiently dissolved in water, there is an effect of improving washing power.

Third, there is an effect that the manufacturing cost of the washing machine does not increase as much as the configuration added for dissolving the detergent is unnecessary.

Fourth, by preventing undissolved detergent from being applied to laundry, there is an effect of preventing contamination of laundry due to coagulation of detergent.

1 is a perspective view illustrating a washing machine according to an embodiment of the present invention.
2 is a cross-sectional view of the washing machine shown in FIG. 1;
3 is a block diagram showing a control relationship between main parts of a washing machine according to an embodiment of the present invention.
4 is a flowchart illustrating a control method of a washing machine according to an embodiment of the present invention.
FIG. 5 is a flow chart showing an embodiment of the water supply step (S10) shown in FIG.
FIG. 6 schematically shows the main parts of a washing machine according to an embodiment of the present invention, and in particular, shows an example of the flow induced in the detergent dissolution step (S20).
FIG. 7 schematically shows the main parts of a washing machine according to an embodiment of the present invention, and in particular, shows an example of the flow induced in the washing step (S30).
FIG. 8 schematically shows the main parts of a washing machine according to an embodiment of the present invention, and in particular, shows another example of the flow induced in the detergent dissolution step (S20).
FIG. 9 illustrates a change in the speed of the inner tub (a), a sequence of steps constituting the control method (b), and a change in the speed of a pump (c) in the method for controlling a washing machine according to embodiments of the present invention.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

1 is a perspective view illustrating a washing machine according to an embodiment of the present invention. 2 is a cross-sectional view of the washing machine shown in FIG. 1; 3 is a block diagram showing a control relationship between main parts of a washing machine according to an embodiment of the present invention.

Referring to FIGS. 1 to 3 , the casing 10 forms the exterior of the washing machine, and an inlet 12h into which laundry is put is formed on the front side. The casing 10 may include a cabinet 11 having an open front, a left side, a right side, and a rear side, and a front panel 12 coupled to the open front side of the cabinet 11 and having an inlet 12h formed therein. can The lower and upper surfaces of the cabinet 11 are open, and a horizontal base (not shown) supporting the washing machine may be coupled to the lower surface. In addition, the casing 10 includes a top plate 13 covering the open upper surface of the cabinet 11 and a control panel 14 disposed above the front panel 12 and constituting a part of the front surface of the casing 10. ) may be further included.

The door 20 for opening and closing the inlet 12h may be rotatably coupled to the casing 10 . The door 20 may include a door frame 21 having an open central portion and rotatably coupled to the front panel 12 , and a transparent window 22 installed in the open central portion of the door frame 21 . have.

An outer tub 31 containing water may be disposed in the casing 10 . The outer tub 31 has an inlet formed on the front side so that laundry can be put therein, and the inlet communicates with an inlet 12h formed in the casing 10 by a gasket 60.

The gasket 60 is to prevent water contained in the outer tub 31 from leaking. The front end is coupled to the front surface (or the front panel 12) of the casing 10, the rear end is coupled to the inlet of the outer tub 31, and a tubular shape extends between the front end and the rear end. The gasket 60 may be made of a material having flexibility or elasticity. The gasket 60 may be made of natural rubber or synthetic resin.

The gasket 60 includes a casing coupling portion 61 coupled around the inlet 12h of the casing 10, an outer shell coupling portion 62 coupled around the inlet of the outer tub 31, and a casing coupling portion 61. It may include an extension portion 63 extending from the external coupling portion 62.

A flat portion 64 extending evenly from the casing coupling portion 61 toward the outer coupling portion 62 is formed in the extension portion 63, and is formed between the flat portion 64 and the outer coupling portion 62. A folding portion 65 may be formed on the.

The folding portion 65 is folded or unfolded when the outer tub 31 moves in the eccentric direction. The folds 65 may be formed over the entire circumference of the gasket 60 .

At least one nozzle 83a or 83b may be installed on the flat portion 64 . Depending on the embodiment, the nozzles 83a and 83b may be integrally formed with the flat portion 64, but are not limited thereto, and a nozzle fastener (not shown) is formed in the flat portion 64, and the gasket 60 ) and a nozzle inlet pipe formed as a separate part (not shown, a pipe through which water pumped by a pump is introduced) may be inserted/fixed to the nozzle fastener. In either case, preferably, the outlet of the nozzle for spraying water toward the inner tub 40 is located inside surrounded by the gasket 60, and the circulating water guide pipe 18 is located outside the gasket 60. connected to the inlet pipe.

An inner tub 40 in which laundry is stored is rotatably provided in the outer tub 31 . A plurality of through holes 47 communicating with the outer tub 31 may be formed in the inner tub 40 . In addition, a lifter 45 may be provided on the inner circumferential surface of the inner tub 40 to lift laundry when the inner tub 40 rotates.

A washing motor 93 for rotating the inner tub 40 may be provided in the casing 10 . Under the control of the control unit 91, the washing motor 93 can not only rotate forward/backward, but also have a variable rotational speed.

The inner tub 40 accommodates the laundry, is disposed so that the inlet through which the laundry is put is located on the front side, and rotates around a substantially horizontal rotation center line C. However, "horizontal" here is not a term used in a mathematically strict sense. That is, when the rotation center line C is inclined at a predetermined angle (eg, 5 degrees or less) with respect to the horizontal as in the embodiment, since it is also close to the horizontal, it can be said to be approximately horizontal.

The outer shell 31 may be supported by a damper 16 installed on the bottom of the casing 10 . Vibration of the outer tub 31 caused when the inner tub 40 rotates is damped by the damper 16 .

At least one water supply pipe (33a, 33b) for guiding water supplied from an external water source such as a tap may be provided. The water supply pipes 33a and 33b may include a cold water supply pipe 33a for guiding cold water and a hot water supply pipe 33b for guiding hot water.

A dispenser 35 for supplying additives into the outer tub 31 may be provided. Water guided through at least one water supply pipe 33a, 33b is supplied into the outer tub 31 via the dispenser 35, and in this process, the additives contained in the dispenser 35 are supplied together with the water.

A valve assembly 34 may be provided to control the flow supplied to the dispenser 35 from at least one water supply pipe 33a or 33b. The valve assembly 34 may include at least one water supply valve (not shown).

The dispenser 35 may include at least one additive accommodating part for accommodating additives such as laundry detergent and rinse aid. The additive accommodating portion may include a detergent accommodating portion accommodating laundry detergent and a rinse accommodating portion accommodating rinse aid, and the detergent accommodating portion and the rinse accommodating portion are partitioned so that additives do not mix with each other.

The control unit 91 controls opening and closing of the at least one water supply valve according to a preset algorithm. The algorithm is configured to supply cold water and/or hot water to the detergent container and/or the rinse container at an appropriate time of the washing operation. For example, by appropriately controlling the at least one water supply valve, cold water and/or hot water may be supplied to the detergent container during the washing cycle, and cold water and/or hot water may be supplied to the rinse container during the rinsing cycle. have.

Meanwhile, the water supplied to the additive container is discharged from the dispenser 35 together with the additive, and the water in which the discharged additive is dissolved is supplied into the outer tub 31 through the water supply bellows 39.

A drain hole for discharging water is formed in the outer tub 31, and a discharge pipe 17 may be connected to the drain hole. A pump 36 (or circulation pump) for pumping the water discharged through the discharge pipe 17 may be provided.

The pump 36 may selectively perform a function of pumping the water discharged through the discharge pipe 17 to the drain pipe 19 and a function of pumping the water discharged through the discharge pipe 17 to the circulating water guide pipe 18 described later.

The pump 36 may include an impeller (not shown) for pumping water, a pump housing (not shown) in which the impeller is accommodated, and a pump motor 92 for rotating the impeller. In the pump housing, an inlet port (not shown) through which water flows in through the discharge pipe 17, a drain discharge port (not shown) through which water pumped by the impeller is discharged to the drain pipe 18, and pumped by the impeller A circulating water discharge port (not shown) may be formed to discharge the filtered water to the circulating water guide pipe 18 .

The pump motor 92 may rotate in both directions (or forward/reverse rotation). Depending on the direction in which the impeller is rotated, water may be discharged through the drain discharge port or through the circulating water discharge port. This configuration can be implemented by appropriately designing the structure of the pump housing, and such technology is already known in Korea Patent Publication No. 10-2013-0109354, etc., and a detailed description thereof will be omitted.

The inlet of the circulating water guide pipe 18 is connected to the circulating water discharge port, and the outlet is connected to nozzles 83a and 83b to be described later. However, it is not limited to this, and the circulation pump 36 for pressurizing the water discharged from the outer tub 31 to the circulating water guide pipe 18 and the drainage pumping the water discharged from the outer tub 31 to the drain pipe 19 A pump may be provided separately. Under the control of a controller (not shown), the circulation pump may be operated (eg, during washing) or the drainage pump may be operated (eg, during drainage) according to a predetermined algorithm. Hereinafter, the pump 36 is exemplified as a circulation pump for dual use of drainage.

Meanwhile, the pump motor 92 is a variable speed motor whose rotational speed is controlled. Depending on the embodiment, when a circulation pump is provided separately from the drainage pump, the pump motor 92 may be a pump motor constituting the circulation pump.

The pump motor 92 is suitable for a BLCD motor (Brushless Direct Current Motor), but is not necessarily limited thereto. A driver for controlling the speed of the pump motor 92 may be further provided, and the driver may be an inverter driver. The inverter driver converts AC power to DC power and inputs it to the motor at the target frequency.

A controller 91 for controlling the pump motor may be further provided. The controller 91 may include a proportional-integral controller (PI controller), a proportional-integral-derivative controller (PID controller), and the like. The controller receives the output value (eg, output current) of the pump motor 92 as an input, and based on this, the rotation speed (or number of rotations) of the pump motor 92 is set at a predetermined target rotation speed (or target rotation speed). The output value of the driver may be controlled to follow the rotational speed).

On the other hand, the controller 91 can control not only the pump motor 92, but also the overall operation of the washing machine, and control of each part mentioned below is understood to be performed by the control of the controller 91, even if there is no special mention. Let's do it.

At least one nozzle 83a or 83b may be provided to inject the circulating water pumped by the pump 36 into the inner tub 40 . In the embodiment, the nozzles 83a and 83b respectively provided on the left and right sides of the gasket 60 are configured to spray water upward from the lower side than the center of the inner tub 40, and furthermore, the nozzles 83a and 83b ), the higher the water pressure supplied, the more upwardly the water may be sprayed.

An outlet of each of the nozzles 83a and 83b may open upward toward the inside of the inner tub 40 . Therefore, when water is supplied at a certain water pressure or higher, the spray through each of the nozzles 83a and 83b is performed in an upwardly inclined direction toward the inside of the inner tub 40, and the sprayed water reaches the depth of the inner tub 40. it can be

On the other hand, when the water pressure of the water supplied to the nozzles 83a and 83b is insufficient, the water injected through the outlets of the nozzles 83a and 83b does not sufficiently proceed upward and easily descends due to gravity, so that the inner tub 40 ) does not reach deep into the inner side of the

That is, according to the pressure of the water supplied to the nozzles 83a and 83b, the spray angle of the nozzles 83a and 83b and the position where the sprayed water reaches are varied. Here, the water pressure is proportional to the rotational speed of the pump 36 , The speed of the pump motor 92 is controlled by the controller 91, so that the shape of the water flow injected from the nozzles 83a and 83b is varied.

4 is a flowchart illustrating a control method of a washing machine according to an embodiment of the present invention. FIG. 5 is a flow chart showing an embodiment of the water supply step (S10) shown in FIG. FIG. 6 schematically shows the main parts of a washing machine according to an embodiment of the present invention, and in particular, shows an example of the flow induced in the detergent dissolution step (S20). FIG. 7 schematically shows the main parts of a washing machine according to an embodiment of the present invention, and in particular, shows an example of the flow induced in the washing step (S30). FIG. 8 schematically shows the main parts of a washing machine according to an embodiment of the present invention, and in particular, shows another example of the flow induced in the detergent dissolution step (S20). FIG. 9 illustrates a change in the speed of the inner tub (a), a sequence of steps constituting the control method (b), and a change in the speed of a pump (c) in the method for controlling a washing machine according to embodiments of the present invention.

A method for controlling a washing machine according to an embodiment of the present invention includes the steps of supplying water into an outer tub (31) by controlling at least one water supply valve, and supplying water into an outer tub (31) by pumping (36) to at least one nozzle (83a, 83b). ), driving the pump 36 at a first speed (RPM1, see (c) of FIG. 9 ) that does not reach and operating the pump 36 at the second speed (RPM3, see (c) of FIG. 9) sprayed through (83a, 83b).

In more detail, referring to FIG. 4 , the control method of the washing machine according to an embodiment of the present invention may include a water supply step (S10), a detergent dissolution step (S20), and a washing step (S30).

The water supplying step (S10) is a step of supplying water into the outer tub 31. Water is supplied to the dispenser 35 through the valve assembly 34, and detergent contained in the detergent container of the dispenser 35 is supplied into the tub 31 together with water.

Referring to FIG. 5, the water supply step (S10) includes steps (S11, S12, S13) of supplying cold water by opening the cold water valve for a predetermined time, and opening the hot water valve to supply hot water after the set time has elapsed. It may include supplying water (S14, S15, S16).

More specifically, the cold water valve is opened and cold water is supplied to the dispenser 35 (S11). The supplied cold water is supplied to the detergent accommodating part of the dispenser 35, and is guided along the water supply bellows 39 together with the detergent contained in the detergent accommodating part and supplied into the outer tub 31.

The control unit 91 determines whether the cold water supplied time T has passed the preset time Ts (S12), and if it is determined that the time T has elapsed, the cold water valve can be shut off to terminate the cold water supply (S13). .

Thereafter, the hot water valve is opened, and hot water is supplied to the dispenser 35 (S14). The supplied hot water is supplied to the detergent accommodating part of the dispenser 35 . Since the detergent contained in the detergent accommodating unit has already been supplied to the outer tub 31 together with the cold water during cold water supply (S11, S12, S13), hot water is not supplied together with the detergent.

On the other hand, the washing machine may include a water level sensor for detecting the water level (L) in the outer tub (31). The control unit 91 determines whether the water level (L) sensed by the water level sensor has reached a preset water level (Ls) (S15), and if it is determined that it has reached it, the hot water valve can be shut off to terminate the hot water supply. (S16). The set water level Ls may be set within a range where the inner tub 40 does not reach, but is not necessarily limited thereto, and may be set slightly higher than the lowest point of the inner tub 40 . Referring to (a) of FIG. 9 , while water is supplied, the washing motor 93 is rotated at approximately 50 rpm, and at this time, the laundry in the tub 40 is moved by the lifter 45 at a rotational angle of the tub 40, approximately It may be raised to a height corresponding to 90 degrees to 110 degrees and then dropped.

The amount of water supplied until the water supply is completed is preferably about 0.7 to 1.0 L, but is not necessarily limited thereto.

After the water supply is completed, the detergent dissolution step (S20) may be performed. In the detergent dissolution step (S20), the pump 36 operates, but the water pumped by the pump 36 is not discharged through the nozzles 83a and 83b. Referring to FIG. 6, the outlet of the pump 36 is located lower than the outlet of the nozzles 83a and 83b, and therefore, the water pumped through the pump 36 is discharged through the nozzles 83a and 83b (or , injection), the water pressure discharged from the pump 36 must be able to overcome the water head difference between the outlet of the nozzles 83a and 83b and the outlet of the pump 36. In the detergent dissolution step (S20), the pump motor 92 is rotated at a first speed (RPM1), and the first speed (RPM1) is such that the flow discharged from the pump 36 is not discharged through the nozzles 83a and 83b. set within the range. The first speed RPM1 may be 1000 to 1800 rpm. For reference, the graph indicated by 71 in (c) of FIG. 9 shows that the rotation of the pump motor 92 is controlled at the first speed RPM1.

In the detergent dissolution step (S20), even if the pump 36 is operated, as shown by the dotted arrow in FIG. 6, the flow is only stirred between the outer tub 31 and the pump 36, and Spraying through is not done. In the detergent dissolution step (S20), the detergent is evenly dissolved in water by the pump 36. In particular, since water is not sprayed through the nozzles 83a and 83b, it is prevented that the detergent is not evenly dissolved and applied to the laundry.

After the detergent dissolution step (S20) is completed, the washing step (S30) may be performed. In the washing step (S30), the pump 36 is rotated at the second speed (RPM3, see (c) in FIG. 9). When the pump 36 is rotated at the second speed (RPM3), water pumped by the pump 36 is sprayed through at least one nozzle 83a or 83b.

The second speed RMP3 is higher than the first speed RPM1 or the roll-down speed, and is preferably 2000 to 4600 rpm. In the detergent dissolving step (S20), water in which the detergent is evenly dissolved (hereinafter, “detergent water”) may be sprayed through at least one nozzle 83a or 83b and directly applied to the laundry in the inner tub 40.

In the washing step (S30), rotation of the inner tub 40 may be controlled according to a preset washing algorithm while detergent water is sprayed through the nozzles 83a and 83b. For example, in (a) of FIG. 9 , a process of accelerating and then braking the washing motor 93 to a speed equal to or higher than the speed at which laundry sticks to the inner surface of the inner tub 40 by centrifugal force (eg, 100 rpm or more) is repeated. It is shown to do

While the laundry sticks to the inner surface of the tub 40 and rotates, the detergent water sprayed through the nozzles 83a and 83b reaches the inner surface of the tub 40, and thus the sprayed detergent water passes through the laundry. Then, it may be discharged to the outer tub 31 through the through hole 47 formed in the inner tub 40 . However, it is not limited thereto, and the rotation of the inner tub 40 can be controlled in various ways in the washing step (S30).

On the other hand, the detergent dissolution step (S20) can also be carried out differently from those described above. Specifically, as shown in FIG. 8 , first nozzles ( 83a), the second nozzle 83b is disposed. When sufficient water pressure is applied, the water sprayed through the first nozzle 83a reaches the second area A2, and the water sprayed through the second nozzle 83b reaches the first area A1.

The rotational speed (RPM2, see (C) of FIG. 9) of the pump motor 92 in the detergent dissolution step (S20) indicates that the water injected through the first nozzle 83a belongs to the first area A1. Water flowing down along a part of the inner tub 40 and sprayed through the second nozzle 83b may be controlled within a range where the water flows down along the other part of the inner tub 40 belonging to the second area A2 . Hereinafter, the rotation speed of the pump motor 92 at this time will be referred to as a roll down speed. For reference, the graph indicated by 72 in (c) of FIG. 9 shows that the rotation of the pump motor 92 is controlled at the roll-down speed (RPM2).

Since water is discharged through the nozzles 83a and 83b, the roll-down speed RPM2 is higher than the speed RPM1 in the above-described embodiment, and is preferably 1800 to 2200 rpm.

When the pump 36 is operated, water in which the detergent is not completely dissolved is discharged through the nozzles 83a and 83b at the beginning of operation, but the water pressure discharged through the nozzles 83a and 83b is relatively low, so that the discharged water The water flows down along the inner surface of the tub 40 at a distance close to the nozzles 83a and 83b, without reaching the opposite area to which each nozzle is directed. Since water is circulated through the pump 36 and the nozzles 83a and 83b, the detergent can be dissolved more quickly.

However, since the water pressure discharged from the nozzles 83a and 83b is low and the discharged detergent water flows down the inner surface of the tub 40, there is a low possibility that the undissolved detergent is directly applied to the laundry. It can reduce the possibility of recontamination of clothing. When the pump 36 is rotated at the roll-down speed (RPM2), the water discharged through the nozzles 83a and 83b falls substantially immediately after being discharged from the nozzles 83a and 83b due to a low injection pressure. For reference, a graph indicated by 71 in (c) of FIG. 9 shows that the rotation of the pump motor 92 is controlled at the first speed RPM1.

On the other hand, in any of the above embodiments, in the detergent dissolving step (S20), the pump 36 may be continuously rotated in one direction. However, preferably, the pump 36 can be rotated alternately in both directions so that the water is more vigorously agitated.

During the detergent dissolution step (S20), controlling the washing motor 93 to repeat acceleration and deceleration between about 80 rpm and 100 rpm and/or controlling the washing motor 93 to repeat acceleration and deceleration between about 40 rpm and 100 rpm. can be carried out.

Claims (18)

an outer tank containing washing water;
an inner tub accommodating laundry and rotatably provided within the outer tub;
A dispenser providing a space in which an additive is accommodated;
a water supply pipe guiding water supplied from an external water source and connected to the dispenser;
a water supply bellows connecting the dispenser and the outer tub;
variable speed pump;
a discharge pipe connecting the outer tank and the pump;
a circulating water guide pipe connected to the pump;
A nozzle connected to the circulating water guide pipe and injecting the water guided through the circulating water guide pipe into the inner tub, wherein the first area and the second area on both sides of the first area and the second area are formed based on a vertical line passing through the center of the inner tub. a nozzle including a first nozzle provided in the first area; and,
The pump is controlled at a set roll-down speed within a range in which water injected through the first nozzle flows down along a portion of the inner tub belonging to the first region and flows into the pump through the discharge pipe, and the first nozzle and a control unit controlling the pump at a speed higher than the roll-down speed so that the water injected through the water reaches the inside of the inner tub belonging to the second region. According to claim 1,
A washing machine comprising a second nozzle provided in the second region. According to claim 2,
The roll-down speed is set within a range in which the water sprayed through the second nozzle flows down along the other part of the inner tub belonging to the second region. According to claim 1,
Further comprising a casing having a laundry inlet on the front,
The washing machine of claim 1 , wherein the inner tub is disposed such that a center line of rotation of the inner tub passes through a rear surface of the casing. According to claim 4,
Further comprising a gasket connecting the laundry inlet of the casing and the inlet provided on the front of the outer tub,
The washing machine wherein the nozzle is disposed in the gasket. According to claim 1,
The roll-down speed is 1800 to 2200 rpm washing machine. According to claim 1,
The controller controls the pump at the roll-down speed and then drives the pump at a speed higher than the roll-down speed. According to claim 7,
The washing machine wherein the speed higher than the roll-down speed is 2000 to 4600 rpm. According to claim 1,
A water supply valve for supplying water to the outer tank; further comprising a water supply valve including a cold water valve and a hot water valve;
The control unit,
A washing machine that opens the cold water valve for a preset time and opens the hot water valve after the preset time elapses. According to claim 9,
Further comprising a water level sensor for detecting the water level in the outer tank,
The controller blocks the hot water valve when the water level in the outer tub reaches a preset water supply level. According to claim 10,
The water supply valve regulates the water supply pipe,
The washing machine rotates at the roll-down speed after the water level in the outer tub reaches the preset water supply level. According to claim 1,
The controller rotates the pump alternately in both directions in a section in which the pump is rotated at the roll-down speed. An outer tub containing wash water, an inner tub rotatably provided within the outer tub to accommodate laundry, a dispenser providing a space for receiving additives, and a water supply pipe connected to the dispenser to guide water supplied from an external water source and a water supply bellows connecting the dispenser and the outer tank, a discharge pipe for discharging water in the outer tank, a variable speed pump connected to the discharge pipe, and a pump and a circulating water guide pipe. and a first nozzle and a second nozzle connected through the circulating water guide pipe to inject the water guided through the circulating water guide pipe into the inner tub, wherein the first nozzle and the second nozzle are based on a vertical line passing through the center of the inner tub. In the control method of the washing machine provided in the first region and the second region on both sides,
(a) supplying water into the outer tub by controlling at least one water supply valve;
(b) water sprayed through the first nozzle flows down along a portion of the inner tub belonging to the first area, and water sprayed through the second nozzle flows down the other portion of the inner tub belonging to the second area. Controlling the pump at a roll-down speed set in a range flowing down and flowing into the pump through the discharge pipe; and
(c) operating the pump at a speed higher than the roll-down speed so that the water sprayed through the first nozzle reaches the inside of the inner tub belonging to the second area. According to claim 13,
The control method of the washing machine wherein the roll-down speed is 1800 to 2200 rpm. According to claim 13,
In step (c), the pump is rotated at 2000 to 4600 rpm. According to claim 13,
In step (a),
supplying cold water by opening a cold water valve for a predetermined time period; and
and supplying hot water by opening a hot water valve after the set time has elapsed. 17. The method of claim 16,
The step of supplying the hot water,
A control method of a washing machine that terminates when the water level in the outer tub reaches a predetermined water supply level. According to claim 13,
The step (b) comprises rotating the pump alternately in both directions.

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