KR101192191B1 - Washing machine - Google Patents

Abstract

An invention for a washing machine is disclosed. The disclosed invention comprises: a cabinet; A tub accommodated in the cabinet; A drum accommodated in this tub; A liquid detergent supply unit for supplying a liquid detergent to the tub; A compressed air supply unit for supplying compressed air to the liquid detergent supply unit to operate the liquid detergent supply unit; And a pressure control unit for adjusting the pressure in the liquid detergent supply unit.

According to the present invention, the washing water and the liquid detergent are automatically mixed and supplied in consideration of the water supply amount of the washing water at the time of washing, so that the user does not have to inject liquid detergent at the time of washing, and the desired amount of liquid detergent is timely. In addition to being able to supply to the liquid detergent does not come in direct contact with the laundry has the advantage of less damage to the laundry.

Washing machine, liquid detergent, water supply

Description

Washing machine {WASHING MACHINE}

The present invention relates to a washing machine, and more particularly to a washing machine having a detergent supply function.

In general, a washing machine is a product that removes various contaminants attached to clothes, bedding, etc. by using the emulsification of detergent, friction action of water flow caused by rotation of the pulsator, and impact action of the pulsator on laundry. Appearing automatic washing machine automatically performs a series of processes leading to washing, rinsing and dehydration without user intervention in the middle.

Such a washing machine may be classified into a top-loading washing machine in which the washing tank is set up and a drum washing machine in which the washing tank is laid, depending on the type of the washing tank in which the laundry is accommodated. Compared to this, not only can the overall height be reduced, but the washing capacity can be increased, and problems such as entanglement are rarely generated, and thus the demand is increasing.

1 is a cross-sectional view schematically showing the structure of a drum type washing machine.

Referring to FIG. 1, a washing machine includes a tub 2 elastically supported by a spring 6 and a damper 7 in a main body 1, and a drum rotatably installed in the tub 2 to accommodate laundry. 3) and a drive unit 4 axially connected to the drum 3. The drive unit 4 is composed of a rotor (not shown) and a stator (not shown), and a drive shaft is connected to the rotor to transmit the driving force of the rotor to the drum 3.

The upper part of the drum (3), the detergent container (8) which is connected to the water supply line (10) is provided, and the detergent container standing so that the user can put the detergent in the interior of the detergent container (8) to be detached to the outside (9) ) Is provided. In addition, the front surface of the main body 1 is provided with the door 5 rotatably from side to side at a position facing the opening of the drum 3.

The washing machine configured as described above, after putting the detergent and bleach and the softener of the powder into the detergent container drawer (9) before washing, and set the type of laundry or washing time through a control panel (not shown) Press the start button to automatically run a series of steps from washing to rinsing and dehydration.

On the other hand, liquid detergents that are well diluted in washing water and excellent in emulsification have recently been widely spread. When the liquid detergent is to be put into the washing machine, it is impossible to inject the detergent by opening the door 5 while the washing water is supplied due to the characteristics of the drum washing machine. It must be introduced through the detergent container (8).

According to the above washing machine, when the liquid detergent is directly added to the laundry, the laundry is damaged, and when the liquid detergent is introduced through the detergent container, the detergent input amount is not accurate due to the structural characteristics of the powder detergent. Problems arise. In other words, the detergent container is a structure in which the powder detergent is diluted in an appropriate amount by the water to be supplied to the drum, but in the case of the liquid detergent, the detergent can be directly added to the drum even if it is not diluted in the wash water due to its fluidity. The detergent container is for the powder detergent, and the dilution amount of the powder detergent and the liquid detergent by washing water is inevitably different. This causes a problem in that it is difficult to control the amount of the detergent detergent. Therefore, there is a need to improve this.

The present invention was devised to improve the above problems, and an object thereof is to provide a washing machine having an improved structure to supply a desired amount of liquid detergent in a timely manner.

Washing machine according to the present invention comprises: a cabinet; A tub accommodated in the cabinet; A drum accommodated in the tub; A liquid detergent supply unit for supplying a liquid detergent to the tub; A compressed air supply unit supplying compressed air to the liquid detergent supply unit to operate the liquid detergent supply unit; And a pressure control unit for adjusting the pressure in the liquid detergent supply unit.

In addition, the present invention preferably further comprises a weight sensing unit for sensing the weight value of the laundry applied to the drum.

In addition, the liquid detergent supply unit, the receiving tank for receiving the liquid detergent; And a supply pipe for supplying the tub with the liquid detergent contained in the receiving tank.

In addition, the pressure control unit, the exhaust pipe for communicating the receiving tank with the outside; And a pressure equalizing valve for opening and closing the exhaust pipe.

In addition, the supply pipe, the first pipe portion connected to the lower portion of the receiving tank; And a second pipe portion extending upward from the first pipe portion.

In addition, the liquid detergent supply unit, it is preferable to further include a detergent amount detecting unit for detecting the level value of the liquid detergent contained in the receiving tank.

In addition, the detergent amount sensing unit, the first sensing unit extending to the lower portion of the receiving tank; A second sensing part extending below the receiving tank and spaced apart from the lower part of the receiving tank by a first length; And a third sensing part extending below the receiving tank and spaced apart from the bottom of the receiving tank by a second length.

In addition, it is preferable that the uppermost end of the second pipe part is located above the lower end of the third sensing part.

The liquid detergent supply unit may further include an air suction unit for sucking the compressed air supplied from the compressed air supply unit and supplying the compressed air into the accommodation tank.

According to the washing machine of the present invention, by washing and supplying the washing liquid and the liquid detergent automatically in consideration of the water supply amount of the washing water at the time of washing, the user does not have to inject the liquid detergent every time when washing the liquid detergent of the desired amount In addition to being able to supply timely, liquid detergent does not directly contact the laundry has the advantage of less laundry damage.

In addition, the present invention, since it is possible to efficiently supply and stop the liquid detergent supply only by controlling the operation of the compressed air supply and the air intake, there is no need to provide a separate valve to control the supply of liquid detergent .

 In addition, the present invention, if the liquid detergent is supplied by the set amount of supply, the operation of the compressed air supply is stopped and at the same time the equalization valve is opened to return the pressure in the receiving tank to the atmospheric pressure level, to prevent excessive supply of liquid detergent, Provides improved liquid detergent supply control.

In addition, the present invention, when the level value of the liquid detergent exceeds the maximum level value or less than the minimum level value, since the detergent amount detection unit detects this and sends a warning message to the user, as described above in the supply amount control of the liquid detergent Problems can be prevented from occurring.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a washing machine according to the present invention. For convenience of explanation, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

2 is a cross-sectional view schematically showing a washing machine according to an embodiment of the present invention, Figure 3 is a schematic view showing a part of the washing machine shown in Figure 2, Figure 4 is a configuration showing a washing machine according to an embodiment of the present invention It is also.

2 to 4, a washing machine 100 according to an embodiment of the present invention includes a cabinet 110, a tub 120, a liquid detergent supply unit 130, a compressed air supply unit 140, and It includes a pressure regulator 150.

The cabinet 110 forms an appearance of the washing machine 100 according to the present embodiment. Tub 120 and other devices are housed in this cabinet 110.

The tub 120 is horizontally installed in the cabinet 110. The tub 120 may be formed of a metal material, a plastic material, or a synthetic resin, and wash water is introduced into the tub 120. In the tub 120, a drum 125 for storing laundry is rotatably received.

According to this embodiment, the detergent container 114 may be further provided inside the cabinet 110. The detergent container 114 is connected to an external water source (water source) is connected to a water supply pipe (not shown) for supplying the wash water to the tub 120, and supplies the powder detergent, fabric softener and the like to the tub 120.

On the other hand, the liquid detergent supply unit 130 is accommodated in the cabinet. The liquid detergent supply unit 130 is provided to supply a liquid detergent to the tub 120, and includes a receiving tank 132 and the supply pipe 134.

The receiving tank 132 is accommodated in the cabinet 110 and accommodates the liquid detergent therein. An injection part 136 may be further provided on the upper portion of the receiving tank 132 so that a user may inject a liquid detergent into the receiving tank 132. The injection part 136 communicates with the receiving tank 132 and is provided to be opened and closed. The injection part 136 is protruded from the receiving tank 132 to be exposed to the outside of the cabinet 110 so that a user can inject a liquid detergent from the outside of the cabinet 110 into the receiving tank 132. It is provided to be exposed to the upper cabinet 110.

As the injection part 136 exposed to the outside of the cabinet 110 may damage the aesthetics of the washing machine 110 as described above, the cabinet 110 may be provided with a cover 112. The washing machine 100 of the present embodiment includes a lid 112 so as to be openable and closed, and when the liquid detergent is injected, the lid 112 is opened to expose the injection portion 136, and the lid 112 is normally used. By closing the injection unit 136 is not exposed to maintain the aesthetics.

The supply pipe 134 is provided to supply the liquid detergent contained in the receiving tank 132 to the tub 120, and includes a first pipe part 134a and a second pipe part 134b.

Among these, the first pipe part 134a is provided to be adjacent to the bottom of the receiving tank 132, preferably the bottom of the receiving tank 132, and is connected to the receiving tank 132. The second pipe part 134b is provided to extend upward from the first pipe part 134a, one side of which is connected to the first pipe part 134a and the other side of which is connected to the detergent container 114. The other side of the second tube part 134b extending upward may be formed to be bent toward the detergent container 114 so that the second tube part 134b may be connected to the detergent container 114.

The compressed air supply unit 140 is provided to supply compressed air to the liquid detergent supply unit 130. The compressed air supply unit 140 serves to operate the liquid detergent supply unit 130 by supplying compressed air to the liquid detergent supply unit 130.

According to the present embodiment, the compressed air supply unit 140 includes an air pump 142 and a connecting pipe 144 connecting the air pump 142 and the receiving tank 132. The air pump 142 generates compressed air, and the compressed air generated by the air pump 142 is supplied into the receiving tank 132 through the connection pipe 144.

As such, the compressed air supplied into the receiving tank 132 pressurizes the liquid detergent contained in the receiving tank 132, and the liquid detergent pressurized by the compressed air is supplied to the outside of the receiving tank 132 through the supply pipe 134. It is discharged and supplied to the tub 120 side. A detailed description thereof will be given later.

As described above, the liquid detergent supply unit 130 to which compressed air is supplied from the compressed air supply unit 140 may further include an air suction unit 138. The air suction part 138 is installed between the air pump 142 and the receiving tank 132, that is, on the connecting pipe 144, and sucks the compressed air supplied from the air pump 142 to receive the receiving tank 132. Supply inside. The air suction unit 138 as described above serves to more smoothly supply the compressed air generated from the air pump 142 into the receiving tank 132.

In addition, the inside of the receiving tank 132 is preferably sealed so that the compressed air supplied from the compressed air supply unit 140 does not leak. That is, the receiving tank 132, the inside is completely sealed so that the compressed air supplied therein can pressurize the liquid detergent efficiently, including the main body of the receiving tank 132, the injection portion 136 and the compressed air All of the connection portion with the supply unit 140 is provided to be sealed.

On the other hand, the liquid detergent supply unit 130 may further include a detergent amount detecting unit 135 for detecting the level of the liquid detergent contained in the receiving tank 132. The detergent amount sensing unit 135 is provided on the receiving tank 132, and includes a first sensing unit 135a, a second sensing unit 135b, and a third sensing unit 135c disposed inside the receiving tank 132. ).

Among these, the first sensing unit 135a extends from the detergent amount sensing unit main body 135d provided in the upper portion of the receiving tank to the lower portion of the inside of the receiving tank 132, and is almost in contact with the bottom surface of the receiving tank 132. Extends to length.

The second sensing unit 135b is spaced apart from the first sensing unit 135a and extends from the detergent sensing unit main body 135d to the lower portion of the inside of the receiving tank 132, and has a first length from the bottom of the receiving tank 132. extend to a distance spaced by (a).

In addition, the third sensing unit 135c is spaced apart from the first and second sensing units 135a and 135b and extends from the detergent amount sensing unit main body 135d to the lower portion of the inside of the receiving tank 132, It extends to a length spaced apart from the bottom by a second length (b).

Here, the first length (a) corresponds to the length corresponding to the minimum level of the liquid detergent required for the liquid detergent supply unit 130 to smoothly supply the liquid detergent, the second length (b) Corresponds to the length corresponding to the maximum level of the liquid detergent that can be stably accommodated in the receiving tank (132).

At this time, the minimum level value of the liquid detergent is set to a level value such that the first pipe portion 134a of the supply pipe 134 can be locked by the liquid detergent, and the maximum level value of the liquid detergent is the second pipe portion 134b. It is set to a water level lower than or equal to the top height of.

Each of the first to third sensing units 135a, 135b, and 135c includes a conductor, and the detergent amount sensing unit 135 including the first to third sensing units 135a, 135b, and 135c includes a first conductor. The level value of the liquid detergent is sensed according to whether the first to third sensing units 135a, 135b, and 135c are in contact with the liquid detergent.

For example, when the level value of the liquid detergent is between the first length a and the second length b, the first sensing unit 135a and the second sensing unit 135b are immersed in the liquid detergent and The first sensing unit 135a and the second sensing unit 135b are energized with each other as the liquid detergent comes into contact with each other.

In this state, when the level value of the liquid detergent drops below the first length (a), the second sensing unit 135b does not come into contact with the liquid detergent, whereby the first sensing unit 135a and the second sensing unit The electrical connection of the part 135b is disconnected.

As such, when the electrical connection between the first sensing unit 135a and the second sensing unit 135b is disconnected, the detergent amount sensing unit main body 135d detects this and transmits a control signal corresponding thereto to the control unit 170. The control unit 170 receiving the control signal recognizes that the liquid level value of the liquid detergent has fallen below the first length (a) and transmits a warning message to the user. According to the present embodiment, the warning message is illustrated as being displayed as a letter or a symbol appearing through the display unit 180, but is not limited thereto. The warning message may be implemented in various ways such as a warning light and a warning sound.

If the level value of the liquid detergent exceeds the second length b, all of the first to third sensing units 135a, 135b, and 135c are immersed in the liquid detergent and come into contact with the liquid detergent. Accordingly, all of the first to third detection units 135a, 135b, and 135c are energized with each other, and the detergent amount detection unit main body 135d detects the transmission and transmits a control signal corresponding thereto to the control unit 170. The control unit 170 receiving the control signal recognizes that the level value of the liquid detergent exceeds the second length (b) and sends a warning message to the user.

The pressure regulator 150 is provided to adjust the pressure inside the liquid detergent supply unit 130. The pressure regulator 150 includes an exhaust pipe 152 and a pressure equalizing valve 154.

The exhaust pipe 152 extends from the receiving tank 132 and communicates with the receiving tank 132 to communicate the inside of the receiving tank 132 with the outside of the receiving tank 132.

The equalization valve 154 is provided on the exhaust pipe 152 to open and close the exhaust pipe 152. The pressure equalizing valve 154 closes the exhaust pipe 152 during the operation of the compressed air supply unit 140 so that the storage tank 132 is kept closed, and the exhaust pipe 152 when the compressed air supply unit 140 stops operating. ) So that the inside of the receiving tank 132 can communicate with the outside of the receiving tank 132.

When compressed air is supplied into the receiving tank 132 by the compressed air supply unit 140, the pressure inside the receiving tank 132 is increased, and thus the liquid detergent contained in the receiving tank 132 is pressurized by the compressed air. And supplied to the tub 120 side.

In this state, even if the compressed air supply unit 140 is stopped to stop the supply of the liquid detergent, the liquid is pressurized by the compressed air until the pressure inside the raised accommodation tank 132 is returned to the atmospheric pressure level. The supply of detergent may continue.

The pressure regulator 150 serves to adjust the pressure inside the receiving tank 132 to an atmospheric pressure level when the operation of the compressed air supply unit 140 is stopped while supplying the liquid detergent. That is, when the operation of the compressed air supply unit 140 is stopped in order to stop the supply of the liquid detergent, the pressure equalizing valve 154 opens the exhaust pipe 152 to the inside of the receiving tank 132 to the outside of the receiving tank 132. It is in communication with, so that the compressed air remaining in the interior of the receiving tank 132 can escape through the exhaust pipe 152, the pressure inside the receiving tank 132 can be adjusted to the atmospheric pressure level.

On the other hand, the washing machine 100 of the present embodiment may further include a weight sensing unit 160 and the control unit 170.

The weight sensing unit 160 detects a weight value applied to the drum 125, that is, a weight value of laundry. The weight sensing unit 160 is configured to include a weight sensor for sensing the weight value of the drum (125). In addition, the controller 170 controls the operation of the entire washing machine 100 according to the present embodiment, and is connected to the detergent amount sensing unit 135 and the weight sensing unit 160. The control unit 170 warns the user according to the control signal transmitted from the detergent amount sensing unit 135 as described above, and the liquid detergent supply unit 130 according to the control signal transmitted from the weight sensing unit 160. And controlling the operation of the compressed air supply unit 140.

5 is a flowchart illustrating a control method of a washing machine according to an embodiment of the present invention.

First, when a user puts laundry into the drum 125 (S10) and operates the corresponding button of the control panel 175 associated with the operation of the liquid detergent supply unit 130 (S20), the weight sensing unit 160 is laundry The control unit 170 transmits a control signal by detecting a weight value of the control unit 170 (S30).

The control unit 170 receiving the control signal from the weight sensing unit 160 calculates the liquid detergent supply amount (S40). When the liquid detergent supply amount is calculated, the control unit 170 controls the compressed air supply unit 140 and the air suction unit 138 to be operated (S50).

Here, the liquid detergent supply amount is calculated as the compressed air supply amount corresponding to the weight value of the laundry, and the supply time of the compressed air supplied into the accommodation tank 132 and the time when the supply unit 140 and the air suction unit 138 operate. Assuming that it is proportional, the liquid detergent supply amount may be calculated as the operation time of the air suction unit 138 and the compressed air supply unit 140 corresponding to the weight value of the laundry.

As described above, when the air suction unit 138 and the compressed air supply unit 140 are operated, compressed air is supplied into the receiving tank 132, and the compressed air pressurizes the liquid detergent contained in the receiving tank 132. . The pressurized liquid detergent is supplied to the detergent container 114 through the supply pipe 134, mixed with the washing water passing through the detergent container 114, and supplied into the tub 120.

When the liquid detergent is supplied by the set supply amount (S60), in other words, when the compressed air supply unit 140 and the air suction unit 138 are operated for the set time, the controller 170 controls the compressed air supply unit 140 and the air suction unit ( While controlling the operation of the step 138 (S70), the pressure inside the holding tank 132 is returned to the atmospheric pressure level by opening the pressure equalizing valve 154 of the pressure adjusting unit 150 (S80).

As described above, when the operation of the compressed air supply unit 140 and the air suction unit 138 is stopped and the pressure equalizing valve 154 is opened to return the pressure inside the receiving tank 132 to the atmospheric pressure level, the liquid detergent supply unit 130 The liquid detergent supply from) is stopped. According to the present embodiment, the uppermost end of the second pipe part 134b provided to extend upward from the first pipe part 134a is provided to be located above the bottom end of the third sensing part 135c.

Due to the characteristics of the supply pipe 134 having this structure, the liquid detergent contained in the receiving tank 132 is supplied to the tub 120 only when the compressed air supply unit 140 and the air suction unit 138 are operated. When the operation of the compressed air supply unit 140 and the air suction unit 138 is stopped, the supply is stopped. In more detail,

When the liquid detergent is filled in the receiving tank 132, most of the liquid detergent is accommodated inside the receiving tank 132 and some of the liquid detergent stays inside the supply pipe 134, and the liquid detergent is supplied to the tub 120. In order to be over the top of the second pipe portion (134b).

When the compressed air supply unit 140 and the air intake unit 138 is operated, the liquid detergent is supplied to the tub 120 by the pressing force of the compressed air supplied therefrom beyond the top of the second pipe unit 134b. When the operation of the compressed air supply unit 140 and the air suction unit 138 is stopped and the pressing force of the compressed air disappears, the liquid detergent does not exceed the upper end of the second pipe part 134b, and thus the supply of the liquid detergent is stopped.

Washing machine 100 of the present embodiment to perform the operation as described above, by supplying the washing liquid and the liquid detergent automatically in consideration of the water supply of the washing water at the time of washing, the user inputs the liquid detergent at the time of washing There is no hassle and can supply the desired amount of liquid detergent in a timely manner and liquid detergent does not come in direct contact with the laundry has the advantage of less damage to the laundry.

In addition, the washing machine 100 of the present embodiment, when the liquid detergent is supplied by the set amount of supply, the operation of the compressed air supply unit 140 is stopped and at the same time the pressure equalizing valve 154 is opened to atmospheric pressure inside the receiving tank 132 By returning to the level, it prevents overfeeding of the liquid detergent as well as providing improved liquid detergent supply control.

In addition, according to the washing machine 100 of the present embodiment, it is possible to efficiently perform the liquid detergent supply and supply interruption only by controlling the operation of the compressed air supply unit 140 and the air suction unit 138, There is no need to provide a valve separately to control the supply.

At this time, the level of the liquid detergent contained in the receiving tank 132 should not be higher than the uppermost end of the second pipe portion 134b, for this purpose, the level of the liquid detergent should be kept below the maximum level. If the level value of the liquid detergent exceeds the maximum level value, the liquid detergent is continuously supplied to the tub 120 side beyond the upper end of the second pipe portion 134b even if the pressurized air is not applied, thereby increasing the supply amount of the liquid detergent. There is a problem with adjustment.

In addition, the water level of the liquid detergent contained in the receiving tank 132 should not be lower than the lowest end of the first pipe portion 134a. For this purpose, the water level of the liquid detergent should be kept below the maximum water level. When the liquid level of the liquid detergent drops below the minimum level, the compressed liquid is not pressurized even though the compressed air is supplied into the receiving tank 132, and thus the liquid detergent is discharged to the outside through the supply pipe 134. Problems with adjusting

According to the washing machine 100 of the present embodiment, when the liquid level value of the liquid detergent exceeds the maximum level value or less than the minimum level value, the detergent amount detecting unit 135 detects this and sends a warning message to the user. As described above, it is possible to prevent a problem from occurring in controlling the supply amount of the liquid detergent.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. In addition, the drum-type washing machine has been described as an example, but this is merely exemplary, and the present invention may be applied to a washing machine other than the drum-type washing machine. Accordingly, the true scope of protection of the present invention should be defined by the following claims.

1 is a cross-sectional view schematically showing the structure of a drum type washing machine.

2 is a cross-sectional view schematically showing a washing machine according to an embodiment of the present invention.

3 is a schematic view showing a part of the washing machine shown in FIG. 2.

4 is a block diagram showing a washing machine according to an embodiment of the present invention.

5 is a flowchart illustrating a control method of a washing machine according to an embodiment of the present invention.

Description of the Related Art [0002]

100: washing machine 110: cabinet

112: cover 120: tub

130: liquid detergent supply unit 132: receiving tank

134: supply pipe 138: air intake

140: compressed air supply unit 150: pressure control unit

152: exhaust pipe 154: pressure equalizing valve

160: weight detection unit 170: control unit

Claims (9)

cabinet; A tub accommodated in the cabinet; A drum accommodated in the tub; A liquid detergent supply unit for supplying a liquid detergent to the tub; A compressed air supply unit supplying compressed air to the liquid detergent supply unit to operate the liquid detergent supply unit; And Washing machine comprising a pressure control unit for adjusting the pressure in the liquid detergent supply unit. The method of claim 1, Washing machine further comprises a weight sensing unit for sensing the weight value of the laundry applied to the drum. According to claim 1, wherein the liquid detergent supply unit, A receiving tank containing a liquid detergent; And And a supply pipe for supplying the tub with the liquid detergent contained in the accommodation tank. According to claim 3, wherein the pressure control unit, An exhaust pipe communicating the accommodation tank with the outside; And Washing machine comprising a pressure equalizing valve for opening and closing the exhaust pipe. According to claim 3, The supply pipe, A first pipe part connected to a lower portion of the accommodation tank; And Washing machine comprising a second pipe portion extending upward from the first pipe portion. The method of claim 5, The liquid detergent supply unit, the washing machine further comprises a detergent amount detecting unit for detecting the level value of the liquid detergent contained in the receiving tank. The method of claim 6, wherein the detergent amount detection unit, A first sensing part extending below the receiving tank; A second sensing part extending below the receiving tank and spaced apart from the lower part of the receiving tank by a first length; And And a third sensing part extending below the receiving tank and spaced apart from the bottom of the receiving tank by a second length. The method of claim 7, wherein The washing machine, characterized in that the uppermost end of the second pipe portion is located above the lowest end of the third sensing portion. The method of claim 3, The liquid detergent supply unit further comprises an air suction unit for sucking compressed air supplied from the compressed air supply unit and supplying the compressed air into the accommodation tank.

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