KR20110013060A - A laundry treatment machine - Google Patents

Abstract

PURPOSE: A laundry treatment machine is provided to easily open a check valve at the lower part even in the low water pressure. CONSTITUTION: A laundry treatment machine comprises a washing tub, a filter(60), and a check valves(70). A pulsator is arranged in the lower part of the washing tub. The filter is arranged in the inner wall of the washing tub. A water inlet part(80) is formed in the side of the filter in order to inflow rotating washing water along the circular direction. A plurality of check valves is separately placed in the side opening part. Some check valves are selectively opened by the water level of the washing tub.

Description

Laundry treatment machine {A laundry treatment machine}

The present invention relates to a laundry treatment apparatus, and more particularly, to a laundry treatment apparatus capable of improving the filtering efficiency by improving the structure of a filter and a check valve that filters foreign substances during washing.

Generally, a laundry treatment machine uses water, detergents, and mechanical action to remove dirt from clothes, bedding, etc. (hereinafter, referred to as 'fo'), and dry hot air and mechanical action heated by a heater. By applying physical and chemical effects to the fabric, such as a dryer for drying wet fabrics, a dry washing machine that combines washing and drying functions, and a refresher that sprays heated steam to the laundry to prevent allergy from the fabrics. Collectively, the various devices for processing.

In addition, the washing machine has a top rod type washing machine in which a cloth entry hole through which a cloth is introduced and exits is formed on the upper surface of the cabinet, and washing is performed by a rotational flow generated when the washing tank is rotated, and a cloth entry hole is formed in the front of the cabinet and the drum is rotated. It can be classified as a drum washing machine in which washing is performed by a drop of cloth.

The conventional top rod type washing machine has a cabinet having an exterior and an open top surface, a base installed at the bottom of the cabinet, an outer tub installed inside the cabinet and storing water, and disposed inside the tub and A driving device including a washing tank to be washed, a motor disposed under the washing tank to rotate the washing tank, a water supply device for supplying water into the outer tank, and a drainage device for draining the water in the outer tank. .

A pulsator is installed on the bottom of the washing tank to receive a driving force of the motor and rotates, and a lint filter is installed on the inner wall of the washing tank to filter foreign matter such as lint from laundry during the washing stroke. .

Meanwhile, an example of a conventional top rod type washing machine and a lint filter applied thereto are disclosed in Korean Patent Application No. 97-39040.

An inlet hole is formed in the lower surface of the conventional lint filter disclosed as described above so that the water flow generated by the pulsator is introduced, and a discharge hole for discharging the washing water filtered out of the foreign substance to the washing tank is passed through the lint filter. . The inlet hole side is provided with a check valve for preventing the foreign matter collected in the lint filter is discharged back to the washing tank side through the inlet hole when the drainage stroke or the motor is stopped.

In the conventional washing machine as described above, the water flow generated by the pulsator during washing administration flows through the lower portion of the lint filter, rises, passes through the lint filter, and is discharged to the washing tank side. At this time, foreign matter such as lint or the like contained in the wash water is collected in the lint filter.

However, in the conventional washing machine, since only the water flow rising on the wall of the washing tank flows through the lower portion of the lint filter, there is a limit in the washing water flowing into the lint filter and thus the filtering efficiency is lowered.

An object of the present invention is to provide a laundry treatment apparatus capable of improving the filtering efficiency by improving the structure of the filter installed on the inner wall of the washing tank.

Laundry processing apparatus according to the present invention is a washing tank with a pulsator disposed at the bottom, disposed on the inner wall of the washing tank, the filter formed with a side inlet portion on the side so that the washing water rotates in the circumferential direction of the washing tank, and the side A plurality of inlet portion is spaced apart in the vertical direction, at least a portion of the plurality includes a check valve in accordance with the water level in the washing tank.

In the present invention, the filter is formed in a rectangular shape formed long in the vertical direction, the side inlet portion may be formed on the left and right sides of the filter, respectively.

In the present invention, the filter may be fastened to the inner wall of the washing tank.

In the present invention, the filter includes a front body having an outlet portion through which the washing water is discharged on the front surface, and a rear body coupled to the rear surface of the front body, and the side inlet portion is formed on at least one of the front body and the rear body. Formed laundry treatment equipment.

In the present invention, the filter may further include a mesh unit disposed between the front body and the rear body.

In the present invention, the side inlet portion may be formed with a plurality of inlet holes spaced apart by a predetermined interval in the vertical direction.

In the present invention, the plurality of check valves are each formed in a long plate shape in the vertical direction, each of the upper and lower hinge protrusions may be formed to be hinged to the side inlet portion.

In the present invention, the check valve may be made of an elastic material to open and close the side inlet portion by the water pressure of the rotating washing water.

In addition, the laundry treatment machine according to another aspect of the present invention is a laundry tank with a pulsator disposed in the lower portion, a rectangular filter arranged long in the vertical direction on the inner wall of the washing tank, and formed long in the vertical direction from the side of the filter And a side inlet portion into which the washing water rotating in the circumferential direction of the washing tank flows in and a side opening portion thereof so as to be opened and closed in a lateral direction, and a check for preventing the washing water flowing into the filter from flowing back out of the filter. It includes a valve.

In the present invention, the check valve is made of a long plate shape in the vertical direction, the upper and lower, the hinge protrusion may be formed so as to hinge the side inlet portion.

In addition, the laundry treatment machine according to another aspect of the present invention has a washing tank in which a pulsator is disposed at a lower portion thereof, and a main inlet portion at a side thereof so that washing water disposed in an inner wall of the washing tank and rotating in a circumferential direction of the washing tank is introduced. A main filter formed, a sub filter having a sub inlet formed in communication with the main filter and into which the wash water in the main filter flows, and a water pressure of the wash water disposed in the main inlet and flowing through the main inlet; And a check valve opened inside the main filter.

In the present invention, the main filter is formed in a rectangular shape and is disposed long in the vertical direction on the inner wall of the washing tank, the sub filter may be formed in a circular shape.

In the present invention, it may further include a check valve disposed in the sub inlet portion, the check valve is opened to the inside of the sub filter by the water pressure of the washing water flowing into the sub inlet portion.

Laundry processing apparatus according to the present invention includes a filter installed on the inner wall of the washing tank, and a check valve mounted on the filter, the inlet portion is formed in the side of the filter is introduced into the wash water, the inlet portion a plurality of check valve Are spaced apart in the vertical direction. Therefore, the rotational water flow generated during operation of the washing machine is easily introduced into the filter, so that a large amount of washing water passes through the filter, thereby improving the filtering efficiency.

In addition, since the washing water in the filter can be prevented from flowing back to the washing tank side by the check valve, recontamination of the washing water and the cloth can be prevented.

In addition, since at least some of the plurality of check valves may be selectively opened and closed according to the water level in the washing tank, there is an advantage in that the check valve disposed lower even when the water pressure in the washing tank is low and easy to open.

In addition, the laundry treatment machine according to another aspect of the present invention, the inlet portion is formed long in the vertical direction on the side of the filter, by providing a check valve corresponding to the inlet portion, the structure is simple, a large amount of wash water The inflow of can be facilitated. In addition, since the check valve is configured to open and close in the lateral direction, the check valve can be opened and closed stably even if the vertical length of the check valve is increased.

In addition, the laundry treatment machine according to another aspect of the present invention includes a rectangular main filter and a circular sub-filter coupled to the main filter, so that the washing water can be filtered a plurality of times. This can be increased.

Hereinafter, a top load type washing machine (hereinafter referred to as a "washing machine") as an embodiment of a laundry treatment machine according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a top load type washing machine according to the present invention, Figure 2 is a longitudinal sectional view of the washing machine shown in FIG.

1 and 2, a washing machine according to the present invention includes a case 1 forming an appearance and a leg assembly 10 coupled to a lower portion of the case 1.

The case 1 has an upper surface and a lower surface formed to be open, a cabinet 2 forming a side surface of a washing machine, a top cover 3 installed to cover an open upper surface of the cabinet 2, and the cabinet ( It includes a base (5) installed on the open lower surface of 2).

In the cabinet 2, an outer tub 4 in which water is accommodated, a washing tub 6 disposed inside the outer tub 4 and containing laundry, a motor 8 for driving the washing tub 6, and the like. And a water supply assembly for supplying water to the inside of the outer tub 4, and a drainage assembly 20 for draining the water in the outer tub 4 after washing or dehydration is completed.

In addition, the case 1 further includes a detergent supply unit 30 installed in the top cover 3 to temporarily store detergent. The detergent supply unit 30 is connected to the water supply assembly and is formed to supply a detergent into the washing tank 6 together with the water supplied.

The top cover 3 is provided with a cloth entrance hole 3a to put or take out the cloth. The top cover 3 is provided with a door 40 for opening and closing the gun access hole (3a). The door 40 may be made of at least a portion of glass (glass) so that the inside can be seen. That is, the door 40 includes a frame portion 40a and a glass portion 40b fitted to the frame portion 40a.

In addition, one side of the top cover 3 is equipped with a display panel 7 for inputting the operation of the washing machine or displaying the operating state of the washing machine.

The outer tub 4 is arranged to be suspended by a plurality of suspensions 15 on the inner top of the cabinet 2. One end of the suspension 15 may be coupled to an inner upper portion of the cabinet 2, and the other end thereof may be coupled to a lower portion of the outer tub 4.

A pulsator 9 is installed at the bottom of the washing tub 6 to form a rotational flow of water contained in the outer tub 4. The pulsator 9 is integrally formed with the washing tank 6, so that the washing tank 6 and the pulsator 9 may rotate together when the motor 8 rotates, and the pulsator 9 may be rotated together. ) Is formed separately from the washing tank 6, it is also possible to rotate separately during the rotation of the motor (8).

A balancer 12 is installed on the upper side of the washing tank 6 to prevent the washing tank 6 from losing balance due to the deflection of cloth. The balancer 12 may be a liquid balancer filled with a liquid such as brine.

On the upper side of the outer tub 4, a tub cover 14 for preventing separation of the cloth and scattering of water is provided.

The tub cover 14 is installed to cover the upper portion of the space between the outer tub 4 and the washing tub 6.

At the time of rotation of the washing tub 6, the washing water passing through the side wall of the washing tub 6 by centrifugal force rises toward the tub cover 14 along the space between the outer tub 4 and the washing tub 6; After hitting the tub cover 14, it is introduced into the washing tub 6.

The water supply assembly includes an external hose 11 for guiding water supplied from an external faucet, etc. to the washing machine, a water supply valve 12 connected to the external hose 11 to regulate water supply, and the water supply valve ( 12) and a water supply hose 13 connecting the detergent supply unit 30. The water supply valve 12 and the water supply hose 13 form a water supply passage for supplying water.

The detergent supply unit 30 is disposed on the water supply passage. The detergent supply unit 30 includes a detergent box housing 31 installed in communication with the water supply hose 13, a detergent box 32 detachably attached to the detergent box housing 31, and the detergent box housing ( It is fixed to 31 and disposed on the upper surface of the detergent box 32 includes a detergent box cover for spraying water.

The detergent box 32 is coupled to the detergent box housing 31 so that a user can take it out of the detergent box housing 31 to inject detergent. The detergent box 32 may be coupled to the detergent box housing 31 so as to slide forward and backward. At least a part of the rear surface of the detergent box 32 may be opened, and detergent may be introduced into the detergent box housing 31 through the rear surface of the detergent box 32 when water is supplied.

The drainage assembly 20 includes a first drain hose 21 connected to a drain hole 26 formed on a lower surface of the outer tub 4, a drain pump housing 24 including a drain pump for pumping water, and And a second drain hose 25 connected to the drain pump housing 24 to drain the water pumped by the drain pump to the outside of the cabinet 2. A drain motor for driving the drain pump is embedded in the drain pump housing 24.

The drainage assembly 20 may be disposed between the outer tub 4 and the base 5.

3 is a front view of a filter according to a first embodiment of the present invention, FIG. 4 is a side view of the filter shown in FIG. 3, and FIG. 5 is a back view of the filter shown in FIG. 6 is a sectional view seen from the AA line direction in FIG. 5, and FIG. 7 is a sectional view showing a coupling state of the check valve shown in FIG. 6.

On the other hand, referring to Figure 2, the washing tank 6 is equipped with a filter 60 for filtering foreign matter such as seams, lint, etc. from the cloth during washing.

The filter 60 is mounted below the inner wall of the washing tank 6. Here, one filter 60 is described as being installed, but a plurality of filters 60 may be disposed at predetermined intervals.

The filter 60 may be directly coupled to the inner wall surface of the washing tub 6, or may be inserted into a separate space such as a flow path formed to accommodate the filter 60 in the washing tub 6. It is possible. Hereinafter, the filter 60 will be described as being fastened and fixed by a separate fastening member after being seated in a groove formed on the inner wall surface of the washing tub 6.

The filter 60 has a rectangular shape formed long in the vertical direction.

The filter 60 includes a front body 61, a rear body 63 coupled to a rear surface of the front body 61, and a mesh disposed between the front body 61 and the rear body 63. (62).

The mesh 62 may be formed as a separate panel from the front body 61 and the rear body 63, and may be disposed in a space between the front body 61 and the rear body 63. It is of course also possible to be provided in each of the grid portion formed in the body 61 and the rear body 63. Here, the mesh 62 is formed as a separate panel, and will be described as being fastened and fixed to at least one of the front body 61 and the rear body 63.

The filter 60 has a side inlet portion 80 formed at a side thereof so that the washing water rotating in the circumferential direction of the washing tank 6 flows in the lateral direction when the washing tank 6 rotates.

The side inlet portion 80 may be formed in at least one of the front body 61 and the rear body 63.

Here, the side inlet portion 80 will be described as being formed in the left and right side surface portions 61a and 61b of the front body 61, respectively.

The side inlet portion 80 includes a left side inlet portion formed on the left side 61a of the front body 61 and a right side inlet portion formed on the right side 61b of the front body 61.

The side entrance portion 80 is an inlet hole formed at the left and right sides of the front body 61, respectively. The inflow hole may be formed in plural, and here, three inflow holes will be described as being arranged in a line with a predetermined interval in the vertical direction.

The front part of the front body 61 is formed with an outlet for discharging the wash water filtered with foreign matter to the washing tank (6). The outlet portion is a plurality of discharge holes 61c formed on the front surface of the front body 61.

3 to 5, the side inlet 80 is provided with a check valve 70 for preventing the washing water flowing into the filter 60 from flowing back out of the filter 60.

A plurality of check valves 70 are installed at the side inlet portion 80. The plurality of check valves 70 are equal to the number of inlet holes of the side inlet portion 80. Therefore, it will be described that three check valves 70 are disposed on the left and right sides of the front body 61, respectively.

That is, the check valve 70 includes first, second and third check valves 71, 72, and 73 spaced apart in the vertical direction.

At least a part of the first, second, third check valves 71, 72, 73 is selectively opened and closed according to the level of the washing tank 6. For example, when the level of the washing tank 6 is lower than the second check valve 72, only the third check valve 73 is opened. When the water level of the washing tank 6 is higher than the second check valve 72, all of the first, second, third check valves 71, 72, 73 can be opened.

Referring to FIG. 5, the check valve 70 is installed to be opened and closed in the lateral direction from the side inlet portion 80, that is, in the left and right direction based on the filter 60.

In addition, the check valve 70 is installed to open only in the inward direction of the filter 60 by the water pressure of the washing water flowing through the side inlet portion (80). That is, referring to FIG. 6, the width W1 of the check valve 70 is larger than the width W2 of the inflow hole 80, so that the check valve 70 of the inflow hole 80 is formed. Since it is caught by the rim, opening of the check valve 70 in the outward direction of the filter 60 may be limited.

The check valve 70 is disposed at the left and right sides of the front body 61, and one of the check valves 70 may be selectively opened depending on the water flow direction of the wash water.

Referring to FIG. 7, the check valve 70 has a rectangular panel shape that is long in the vertical direction.

The check valve 70 is made of an elastic material so that it can be flipped by the water pressure of the wash water flowing through the side inlet portion 80. That is, the check valve 70 may be made of a material such as rubber or silicon.

Upper and lower ends of the check valve 70 are rotatably coupled to the side inlet portion 80.

Hinge protrusions 70a hinged to the side inlet portion 80 are formed to protrude from the upper and lower surfaces of the check valve 70. The hinge protrusion 70a may be made of an elastic material such as rubber.

The upper and lower ends of the first, second, and third check valves 710 (72, 73) are respectively supported on the left and right side portions 61a and 61b of the front body 61, and the hinge protrusions ( The support rib 61d in which the fitting hole 61e into which 70a is fitted is formed.

Referring to the operation according to the first embodiment of the present invention configured as described above is as follows.

When at least one of the washing tank 6 and the pulsator 9 is rotated due to the driving of the motor 8 during operation of the washing machine, the washing tank 6 may be A rotational flow flowing in the circumferential direction is formed.

As shown in FIG. 6, the hydraulic pressure of the rotary water flow pushes the check valve 70 to the inside of the filter 60, and the check valve 70 opens to the inside of the filter 60.

Thus, the rotary water flow is introduced into the filter 60 through the side inlet portion 80 of the filter 60. The introduced washing water is discharged to the washing tank 6 through the discharge hole 61c after the foreign matter is filtered while passing through the mesh part 62.

At this time, at least some of the first, second and third check valves 71, 72, and 73 may be selectively opened and closed according to the level of the washing water in the washing tank 6. For example, when the wash water level is lower than the height of the second check valve 72, only the third check valve 73 is opened.

 In addition, when the wash water level is lower than the height of the second check valve 72, only the second and third check valve 72, 73 can be opened. In addition, when the water level of the wash water is higher than the height of the check 2 check valve 72, all of the first, second and third check valves 71, 72, 73 can be opened.

Therefore, even when the water level is low and the water pressure is weak, only the check valve of the corresponding height can be opened, so that the check valve 70 can be easily opened. In addition, when only the third check valve 73 is opened, since the first and second check valves 71 and 72 are closed, the inner upper portion of the filter 60 is shielded, and the washing flows into the inside. Not only can a sufficient space be secured in which the water can be filtered, but the washing water once introduced into the inside can be prevented from flowing out through the upper side.

On the other hand, at the time of stopping the motor 8, terminating the washing stroke, or draining stroke, the water pressure of the washing water flowing into the filter 60 is weakened or lost.

The check valve 70 is returned to its original position, and the washing water or the foreign matter remaining in the filter 60 is prevented from flowing back through the side inlet portion 80.

8 is a perspective view illustrating the back of the filter and the check valve according to the second embodiment of the present invention.

8, in the filter of the laundry treatment machine according to the second embodiment of the present invention, left and right inflow holes 81a and 81b into which the washing water flows into the left and right side portions of the front body 81, respectively. The configuration and operation of each other formed one by one, and the left and right check valves 91 and 92 corresponding to the left and right inlet holes 81a and 81b respectively provided are different from those of the first embodiment of the present invention. Since it is the same, the same reference numerals are used for the same configuration, and redundant description thereof will be omitted.

The left and right inlet holes 81a and 81b are formed long in the vertical direction, respectively, and the left and right check valves 91 and 92 correspond to the shapes of the left and right inlet holes 81a and 81b. It has a long plate shape in the vertical direction as long as possible.

The left and right check valves 91 and 92 have upper and lower hinge protrusions formed to be hinged to the left and right inlet holes 81a and 81b.

One check valve is disposed to correspond to each inlet hole, so that the structure can be simple and easy to assemble.

In addition, since the left and right inflow holes 81a and 81b are formed in the entire left and right side surface portions of the front body 81, a larger amount of washing water can be introduced and filtering efficiency can be improved. .

On the other hand, Figure 9 is a view showing the front of the filter according to a third embodiment of the present invention, Figure 10 is a view showing the side of the filter according to a third embodiment of the present invention, Figure 11 is a view of the present invention An exploded perspective view of the filter according to the third embodiment.

9 to 11, the filter 100 according to the third exemplary embodiment of the present invention includes a main filter having a main inlet 111c at a side thereof so that washing water rotating in the circumferential direction of the washing tank 6 is introduced. A sub-filter 120 coupled to the main filter 110 and having a sub-inlet part through which the washing water in the main filter 110 flows, and a main inlet part 111c disposed at the main inlet part 111c. The construction and operation of the pump 110 except for including the check valve 130 which is opened to the inside of the main filter 110 by the water pressure of the washing water introduced through the unit 111c are different from those of the first embodiment of the present invention. Since it is the same, the same reference numerals are used for the same configuration, and redundant description thereof will be omitted.

The main filter 110 may have a rectangular shape having a long length in the vertical direction. The main filter 110 is disposed long in the vertical direction on the inner wall of the washing tank (6).

The main filter 110 may include a front body 111, a rear body 113 coupled to the rear of the front body 111, and a mesh disposed between the front body 111 and the rear body 113. 112).

Referring to FIG. 11, the front surface of the front body 111 has a plurality of coupling holes 111a to which the sub-filters 120 are coupled, and a plurality of discharged washing water having foreign substances filtered therein to the washing tank 6. The discharge hole 111b is formed.

The main inlet 111c is an inlet hole formed in each of the left and right side portions of the front body 111, and will be described as being composed of a plurality of holes.

A plurality of check valves 130 may be installed to correspond to the plurality of inflow holes, respectively. The check valve 130 is opened laterally by the water pressure of the washing water flowing through the inlet hole.

The sub filter 120 may have a circular cross-sectional shape. The sub filter 12 may include a front body 121 and a rear body 122.

The sub inlet 123 is formed at the left and right sides of the sub filter 120, and the sub inlet 123 has a check valve that opens to the inside of the sub filter 120 by water pressure of washing water. Can be installed. Hereinafter, since the configuration and operation of the sub filter 120 and the check valve are similar to those of the first embodiment, redundant description thereof will be omitted.

Therefore, the filter according to the third embodiment of the present invention is composed of the main filter 110 and the sub-filter 120, the washing water is filtered twice, so the filtering efficiency can be improved.

Those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is indicated by the scope of the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalent concept are included in the scope of the present invention. Should be interpreted.

Laundry processing apparatus according to the present invention includes a filter installed on the inner wall of the washing tank, and a check valve mounted on the filter, the inlet portion is formed in the side of the filter is introduced into the wash water, the inlet portion a plurality of check valve Are spaced apart in the vertical direction. Therefore, the rotational water flow generated during operation of the washing machine is easily introduced into the filter, so that a large amount of washing water passes through the filter, thereby improving the filtering efficiency.

In addition, since the washing water in the filter can be prevented from flowing back to the washing tank side by the check valve, recontamination of the washing water and the cloth can be prevented.

In addition, since at least some of the plurality of check valves may be selectively opened and closed according to the water level in the washing tank, there is an advantage in that the check valve disposed lower even when the water pressure in the washing tank is low and easy to open.

In addition, the laundry treatment machine according to another aspect of the present invention, the inlet portion is formed long in the vertical direction on the side of the filter, by providing a check valve corresponding to the inlet portion, the structure is simple, a large amount of wash water The inflow of can be facilitated. In addition, since the check valve is configured to open and close in the lateral direction, the check valve can be opened and closed stably even if the vertical length of the check valve is increased.

In addition, the laundry treatment machine according to another aspect of the present invention includes a rectangular main filter and a circular sub-filter coupled to the main filter, so that the washing water can be filtered a plurality of times. This can be increased.

1 is a perspective view of a top load type washing machine according to the present invention.

FIG. 2 is a longitudinal sectional view of the washing machine shown in FIG. 1.

3 is a front view of a filter according to a first embodiment of the present invention.

4 is a side view of the filter shown in FIG. 3.

FIG. 5 is a perspective view illustrating the back of the filter and the check valve of FIG. 3.

FIG. 6 is a cross-sectional view taken along a line A-A in FIG. 5.

7 is a cross-sectional view showing a coupling state of the check valve shown in FIG.

8 is a perspective view showing the back of the filter and the check valve according to a second embodiment of the present invention.

9 is a front view of a filter according to a third embodiment of the present invention.

10 is a side view of a filter according to a third embodiment of the present invention.

11 is an exploded perspective view of a filter according to a third embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Fig.

6: washing tank 60: filter

61: front body 62: mesh

63: rear body 70: check valve

71: first check valve 72: second check valve

73: third check valve 80: side inlet

110: main filter 120: sub filter

Claims (13)

A washing tank in which a pulsator is disposed below; A filter disposed on an inner wall of the washing tank and having a side inlet portion at a side thereof to allow washing water to rotate in a circumferential direction of the washing tank; A plurality of laundry treatment apparatus including a check valve is arranged in the side inlet portion spaced apart in the vertical direction, at least some of the plurality of selectively opened and closed according to the water level in the washing tank. The method according to claim 1, The filter has a rectangular shape formed long in the vertical direction, The side inlet is formed on the left and right sides of the filter, respectively. The method according to claim 1, The filter is a laundry treatment device fixed to the inner wall of the washing tank. The method according to claim 1, The filter includes a front body having an outlet portion through which the washing water is discharged on the front surface, and a rear body coupled to the rear surface of the front body. The side inlet portion laundry processing machine formed on at least one side of the front body and the rear body. The method according to claim 4, The filter further comprises a mesh unit disposed between the front body and the rear body. The method according to claim 1, Laundry treatment equipment formed in the side inlet portion is a plurality of inlet holes spaced apart a predetermined interval in the vertical direction. The method according to claim 1, The plurality of check valves are each made of a plate shape long in the vertical direction, Each upper and lower sides of the laundry processing device is formed with a hinge protrusion protrudes to the hinge hinge. The method according to claim 1, The check valve is a laundry processing device made of an elastic material to open and close the side inlet portion by the water pressure of the rotating washing water. A washing tank in which a pulsator is disposed below; A rectangular filter disposed longitudinally on the inner wall of the washing tank; A side inlet portion which is formed to extend in a vertical direction from the side of the filter and which wash water is rotated in the circumferential direction of the washing tank; And a check valve installed at the side inlet to be opened and closed in a lateral direction and preventing the washing water flowing into the filter from flowing back out of the filter. The method according to claim 9, The check valve is made of a long plate shape in the vertical direction, The upper and lower laundry processing device is formed with a hinge protrusion protrudes so as to hinge the side entrance. A washing tank in which a pulsator is disposed below; A main filter disposed on an inner wall of the washing tub and having a main inlet portion at a side thereof to allow washing water to rotate in a circumferential direction of the washing tub; A sub filter coupled to communicate with the main filter and having a sub inlet configured to introduce wash water in the main filter; And a check valve disposed at the main inlet, the check valve being opened inside the main filter by the water pressure of the washing water flowing through the main inlet. The method of claim 11, The main filter is formed in a rectangular shape and is disposed long in the vertical direction on the inner wall of the washing tank, The sub filter is a laundry treatment device made of a circular shape. The method of claim 11, And a check valve disposed on the sub inlet, the check valve being opened inside the sub filter by the water pressure of the washing water flowing into the sub inlet.

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