Clothes treatment apparatus

Abstract

The present invention provides a clothes treatment apparatus. The clothes treatment apparatus in one embodiment comprises: a microfiber filter which filters out microfibers when washing water flowing in from a discharge pipe connected to a tub is discharged to the outside through a drain outlet, and which is disposed between a circulation outlet and the drain outlet; a circulation pump allowing the washing water discharged from the discharge pipe to flow to a circulation pipe; and a drain pump for discharging, to a drain pipe, the washing water discharged from the discharge pipe, wherein, when a drain operation is performed, the drain pump repeats driving and stopping at least once so as to drain the washing water of the tub, and the circulation pump is driven at least once within a stop time for which the drain pump is stopped.

Description

Garment processing equipment

[0001] The present invention relates to a garment treatment device. More specifically, it is a garment treatment device having a microfiber filter that filters microfibers from wash water.

[0002] In general, a garment treatment device is a device that processes laundry by applying physical and chemical actions to the laundry.

[0003] The garment treatment device may include a tub that is accommodated in a suspended form by the interior of the cabinet, a drum that rotates within the tub while laundry (or fabric) is accommodated therein, and a filter that removes contaminants.

[0004] During the washing process, laundry may rotate or fall due to the rotation of the drum, which can cause friction between laundry items.

[0005] There is a problem that microfibers, which are microplastics, are separated from the laundry due to friction between laundry items, and the microfibers are discharged with the wash water, causing environmental pollution.

[0006] Typically, water used to wash laundry can be drained after passing through the filter to remove contaminants. However, conventional filters are unable to filter microfibers due to their large filtration holes.

[0007] Recently, the idea of ​​applying microfiber filters to washing machine drains has emerged for the purpose of reducing microfiber emissions.

[0008] Microfiber filters must filter fibers ranging from a few millimeters to several micrometers. To achieve this, they typically use fine meshes of 100 micrometers or less. This creates problems not seen in lint filters, which have pores on the order of millimeters. Cotton and cellulose-based synthetic fibers shed large amounts of microfibers with each wash. Consequently, microfiber filters experience drainage delays even during a single wash cycle for practical clothing, and clogging can lead to poor drainage within several washes.

[0009] Therefore, microfiber filters require frequent cleaning or replacement. Frequent filter cleaning or replacement can be both inconvenient and costly for the user.

[0010] Prior art document 1, EP 3907322 B1, has a bypass channel that allows for drainage without passing through a filter when drainage is not smooth. In this case, when wash water is discharged through the bypass channel, the wash water does not pass through the filter, resulting in the discharge of microfibers. In other words, although Prior Art Document 1 solves the drainage delay problem, it discharges microfibers when drainage is poor, resulting in a significantly lower overall filtration rate. Furthermore, the device volume increases due to the bypass channel, and structural complexity increases due to the need for an additional process for assessing the filter's filtration capacity.

[0011] Prior art document 2, Korean Patent Publication No. 2018-0103515, discloses a washing unit for washing a filter unit and a control method thereof, but does not disclose a technology for washing the filter by recovering a portion of the wastewater that has passed through the filter.

[0012] Prior art document 3, Korean Patent Publication No. 2016-0111684, discloses a washing machine equipped with a foreign matter collection device located on a drainage path, but does not disclose a technology for recovering a portion of the drainage water that has passed through the filter and washing the filter.

[0013] One of the problems to be solved by the present invention is to provide a clothing treatment device that can extend the life of a microfiber filter by washing the microfiber filter and increase the replacement or washing cycle by the user.

[0014] One of the problems to be solved by the present invention is to provide a clothing treatment device capable of preventing drainage delay due to clogging of the surface of a microfiber filter.

[0015] One of the problems to be solved by the present invention is to provide a clothing treatment device capable of self-cleaning a microfiber filter.

[0016] One of the problems to be solved by the present invention is to provide a clothing treatment device capable of cleaning the surface of a microfiber filter without applying a separate actuator for cleaning the microfiber filter.

[0017] One of the problems to be solved by the present invention is to provide a clothing treatment device that uses reverse current washing of a microfiber filter to wash a microfiber filter, and maximizes the reverse current washing effect.

[0018] One of the problems to be solved by the present invention is to provide a clothing treatment device in which a clump of microfibers separated from a microfiber filter can be removed from a drainage channel.

[0019] One of the problems to be solved by the present invention is to provide a clothing treatment device that prevents the problem of microfiber clumps separated from a microfiber filter re-contaminating the microfiber filter.

[0020] One of the problems to be solved by the present invention is to provide a clothing treatment device capable of shaping microfibers into clumps and capturing them with a lint filter.

[0021] The present invention provides a clothing treatment device. In one embodiment, the clothing treatment device includes a cabinet forming an exterior; a tub positioned inside the cabinet and storing washing water; a drum rotatably provided inside the tub and accommodating laundry therein; a discharge pipe connected to the tub and discharging washing water; a pump module connected to the discharge pipe and circulating washing water discharged from the tub back to the tub or discharging it to the outside of the cabinet; a circulation pipe connected to the pump module and guiding washing water introduced into the pump module to the tub; and a drain pipe connected to the pump module and discharging washing water introduced into the pump module to the outside of the cabinet, wherein the pump module includes an inlet connected to the discharge pipe; a drain outlet spaced apart from the inlet and in fluid communication with the inlet, and connected to the drain pipe; a circulation outlet spaced apart from the inlet and the drain outlet, in fluid communication with the inlet and the drain outlet, and connected to the circulation pipe; A microfiber filter disposed between the circulation outlet and the drain outlet, which filters microfibers when the washing water flowing in from the discharge pipe is discharged to the outside through the drain outlet; a circulation pump which causes the washing water discharged from the discharge pipe to flow into the circulation pipe; and a drain pump which discharges the washing water discharged from the discharge pipe into the drain pipe, wherein when a draining operation is in progress, the drain pump repeats driving and stopping at least once to drain the washing water in the tub, and the circulation pump is driven at least once during a stop time during which the drain pump is stopped.

[0022] In one embodiment, the operating time of the circulation pump may be shorter than or equal to the stopping time of the drainage pump.

[0023] In one embodiment, the drain pump repeats operation and stop multiple times, and the number of times the circulation pump is operated may be less than or equal to the number of times the drain pump is stopped.

[0024] In one embodiment, the circulation pump may be driven during at least one of the multiple intervals during which the drainage pump is stopped.

[0025] In one embodiment, when the drainage pump stops operating, the circulation pump may start operating after a certain period of time.

[0026] In one embodiment, the drain pump may be operated and stopped periodically.

[0027] In one embodiment, the operating time of the drain pump may be longer than the stopping time of the drain pump.

[0028] In one embodiment, the operating time of the drain pump may be at least two times and at most four times the stopping time of the drain pump.

[0029] In one embodiment, the stopping time of the drain pump may be 3 seconds or more and 10 seconds or less.

[0030] In one embodiment, the stop time of the drain pump may be a time for ensuring reverse flow of washing water from the drain pipe to the microfiber filter.

[0031] In one embodiment, at least a portion of the drain pipe may be positioned higher than the microfiber filter.

[0032] In one embodiment, at least a portion of the drain pipe may be located above the maximum water level of the tub.

[0033] In one embodiment, the pump module may be positioned lower than the tub.

[0034] In one embodiment, the pump module may further include a first filter housing that accommodates the microfiber filter and has a first filter chamber formed therein in fluid communication with the inlet, the drain outlet, and the circulation outlet.

[0035] In one embodiment, the circulation pump may form a negative pressure in the first filter chamber in the direction of the circulation outlet.

[0036] In one embodiment, the drain pump may form a negative pressure in the first filter chamber in the direction of the drain outlet.

[0037] In one embodiment, the pump module may further include a lint filter having larger filtering holes than the microfiber filter and filtering lint from the wash water, and arranged between the water inlet and the circulation outlet.

[0038] In one embodiment, the pump module may further include a second filter housing that accommodates the lint filter and has a second filter chamber formed therein in fluid communication with the inlet, the drain outlet, and the circulation outlet.

[0039] In one embodiment, the second filter housing may be positioned at a height equal to or lower than the first filter housing.

[0040] According to a garment treatment device according to an embodiment of the present invention, the lifespan of a microfiber filter can be extended through microfiber filter washing, and the replacement or washing cycle by a user can be increased.

[0041] According to a garment treatment device according to an embodiment of the present invention, delay in drainage due to clogging of the surface of a microfiber filter can be prevented.

[0042] According to a garment treatment device according to an embodiment of the present invention, self-cleaning of a microfiber filter is possible.

[0043] According to a garment treatment device according to an embodiment of the present invention, the surface of a microfiber filter can be cleaned without applying a separate actuator for cleaning the microfiber filter.

[0044] According to a clothing treatment device according to an embodiment of the present invention, a microfiber filter is washed using reverse current washing of the microfiber filter, and the reverse current washing effect can be maximized.

[0045] According to a garment treatment device according to an embodiment of the present invention, a clump of microfibers separated from a microfiber filter can be removed from a drainage channel.

[0046] According to a garment treatment device according to an embodiment of the present invention, the problem of microfiber clumps separated from a microfiber filter re-contaminating the microfiber filter can be prevented.

[0047] According to a garment treatment device according to an embodiment of the present invention, microfibers can be clumped and captured by a lint filter.

[0048] According to a garment treatment device according to an embodiment of the present invention, it is possible to prevent performance of the pump from being impaired due to clogging of the microfiber filter.

[0049] According to a clothing treatment device according to an embodiment of the present invention, since the filter is washed while filtration by the filter is in progress, drainage can proceed smoothly without being blocked.

[0050] Figure 1 is a perspective view showing a clothing treatment device according to one embodiment of the present invention.

[0051] Figure 2 is a partial perspective view showing the internal structure of a garment treatment device according to one embodiment of the present invention.

[0052] Figure 3 is a partial cross-sectional view showing the internal structure of a garment treatment device according to one embodiment of the present invention.

[0053] FIG. 4 is a diagram illustrating a control unit of a garment treatment device according to one embodiment of the present invention.

[0054] Figure 5 is a schematic diagram illustrating a pump module according to one embodiment of the present invention.

[0055] Figure 6 is a partial perspective view illustrating a pump module according to one embodiment of the present invention.

[0056] Figure 7 is an exploded perspective view of a pump module according to one embodiment of the present invention.

[0057] Figure 8 is a cross-sectional perspective view of a pump module according to one embodiment of the present invention.

[0058] FIG. 9 is a cross-sectional view of a pump module according to one embodiment of the present invention, illustrating a circulation path and a drain path.

[0059] FIG. 10 is a drawing explaining a method for washing a microfiber filter using a pump module according to one embodiment of the present invention.

[0060] Figure 11 is a drawing explaining the principle of cleaning a microfiber filter by reverse flow of washing water.

[0061] Figure 12 is a flowchart illustrating a draining algorithm according to one embodiment of the present invention.

[0062] FIG. 13 is a drawing explaining a method of driving a drainage pump and a circulation pump during a drainage operation according to the first embodiment of the present invention.

[0063] FIG. 14 is a drawing explaining a method of driving a drainage pump and a circulation pump during a drainage operation according to a second embodiment of the present invention.

[0064] FIG. 15 is a drawing explaining a method of driving a drainage pump and a circulation pump during a drainage operation according to a third embodiment of the present invention.

[0065] FIG. 16 is a drawing explaining a method of driving a drainage pump and a circulation pump during a drainage operation according to a fourth embodiment of the present invention.

[0066] Figure 17 is a schematic diagram illustrating a pump module according to another embodiment of the present invention.

[0067] Figure 18 is an exploded perspective view of a pump module according to another embodiment of the present invention.

[0068] Figure 19 is a cross-sectional perspective view of a pump module according to another embodiment of the present invention.

[0069] Fig. 1 is a perspective view illustrating a garment treatment device according to one embodiment of the present invention. The exterior of the garment treatment device according to one embodiment will be described with reference to Fig. 1.

[0070] As an example of a clothing treatment device, a washing machine (100) is illustrated. The washing machine (100) includes a cabinet (110). The cabinet (110) is a component that forms the exterior of the washing machine (100). The cabinet (110) may include a side cabinet (115) that forms the side of the washing machine (100), a front cabinet (111) that is coupled to the front of the side cabinet (115), and an upper cabinet (116) that is provided on the upper side of the side cabinet (115). A base (112, see FIG. 6) that forms the bottom of the washing machine (100) may also be included in the cabinet (110).

[0071] A laundry entry hole is formed in the front cabinet (111) to allow laundry to enter and exit. A door (113) opens and closes the laundry entry hole. The door (113) may be rotatably fastened to the front cabinet (111). The door (113) may be provided with a glass (113a) to allow the laundry inside the washing machine (100) to be observed from outside the washing machine (100).

[0072] A control panel (114) may be provided on the upper part of the front cabinet (111). The control panel (114) may include a course selection unit (114a) for receiving course selection input from the user, and a display unit (114b) for receiving various control commands from the user and displaying the operating status of the washing machine (100).

[0073] The washing machine (100) may include a detergent dispenser (150) for storing detergent. The detergent dispenser (150) may be provided on the upper part of the front cabinet (111).

[0074] A filter cover (118) may be provided in the front cabinet (111). The filter cover (118) may be coupled to the front cabinet (111). The filter cover (118) may be positioned at a position overlapping with caps (1430, 1530) for opening and closing the filter housing (1410, 1510) described below when viewed from the front. The filter cover (118) may be separated from the front cabinet (111). One side of the filter cover (118) may be hinge-coupled to the front cabinet (111). The filter cover (118) separated from the front cabinet (111) may be rotated around the hinge axis.

[0075] Fig. 2 is a partial perspective view showing the internal structure of a garment treatment device according to one embodiment of the present invention. The internal structure of the garment treatment device according to the embodiment will be described with reference to Fig. 2.

[0076] A tub (120) for storing washing water is provided inside the washing machine (100). A drum (130) is provided inside the tub (120) so as to be rotatable.

[0077] The washing machine (100) may include a water supply unit (140) for supplying washing water to a tub (120), a detergent dispenser (150) for mixing water and detergent supplied from the water supply unit (140) and supplying them to the tub (120), and a drain unit (170) for discharging washing water after washing is completed.

[0078] In an embodiment, the washing machine (100) may further include a steam generator (160) that heats water and supplies steam to the tub (120).

[0079] In an embodiment, the washing machine (100) may be equipped with a drying device (180) that heats and supplies / circulates air in the tub (120).

[0080] The water supply unit (140) may include a plurality of water supply valves (143) and a plurality of water supply hoses (144, 145, 146) to supply detergent supplied from an external water source (HW, CW) to a tub (120), a detergent dispenser (150), a steam generator (160), etc.

[0081] The water supply unit (140) is connected to a hot water supply source (HW) that supplies hot water and a cold water supply source (CW) that supplies cold water through a hot water hose (141) and a cold water hose (142), respectively, and water introduced through the hot water hose (141) and the cold water hose (142) can be supplied to a detergent dispenser (150), a steam generator (160), and / or a water supply nozzle (191) through appropriate control of a water supply valve (143).

[0082] The water supply unit (140) may include a dispenser water supply hose (144) for guiding water to a detergent dispenser (150), a steam water supply hose (145) for guiding water to a steam generator (160), and a front water supply hose (146) for guiding water to a water supply nozzle (191).

[0083] A gasket (190) may be provided between the cabinet (110) and the tub (120). The gasket (190) can prevent water stored in the tub (120) from leaking between the tub (120) and the cabinet (110).

[0084] A water supply nozzle (191) is provided on the upper part of the gasket (190) to supply water supplied from a water supply source (HW, CW) into the interior of the drum (130) and simultaneously to the inner surface of the gasket (190), and circulation nozzles (not shown) may be provided on both sides of the gasket (190) to circulate the washing water supplied to the tub (120) by the pump module (1000) and then circulate and supply it back to the tub (120). The circulation nozzle (not shown) is connected to a circulation pipe (174).

[0085] The detergent dispenser (150) temporarily stores additives such as spare or main laundry detergent, fabric softener, and bleach, and can mix the washing water supplied from the water supply unit (140) with the additives and supply them to the tub (120).

[0086] The detergent dispenser (150) may be provided with multiple compartmentalized receiving spaces (not shown) so that the additives to be received can be received separately without being mixed with each other, and water can be supplied individually to each receiving space.

[0087] The detergent dispenser (150) has a detergent dispenser housing (151) formed in a form that is recessed into the interior of the cabinet (110), and may be provided in the form of a drawer so that the detergent dispenser housing (151) can be pulled out to the front of the cabinet (110).

[0088] The detergent dispenser housing (151) is connected to the tub (120) through a water supply bellows (152). Water supplied by the water supply unit (140) passes through the detergent dispenser (150) and is mixed with an additive, and then can be moved into the tub (120) along the water supply bellows (152) connected to the detergent dispenser housing (151).

[0089] The steam generator (160) is a device that generates steam by heating water supplied from the water supply unit (140). The steam generator (160) supplies the generated steam from the front of the drum (130) to perform functions such as sterilizing and removing wrinkles from laundry inside the drum (130).

[0090] The drying device (180) guides the flow of air so that it heats and circulates the air inside the tub (120) and is guided back into the tub (120). The drying device (180) may include an intake duct (181) that sucks in the air of the tub (120) and a supply duct (182) that guides the moving air to the tub (120).

[0091] A blower fan (183) that creates pressure to move air may be provided between the intake duct (181) and the supply duct (182). The intake duct (181) connects the rear outer surface of the tub (120) and the blower fan (183), and the supply duct (182) may connect the blower fan (183) and a gasket (190). A heater (not shown) for heating the air moving through the supply duct (182) may be further provided inside the supply duct (182).

[0092] The gasket (190) is coupled to the front cabinet (111) on one side and coupled along the perimeter of the open front of the tub (120) on the other side. The gasket (190) may be formed in the form of a bellows that elastically folds in response to vibration of the tub (120) to cushion vibration. The gasket (190) may be formed of a deformable or flexible material having some elasticity, and may be formed using natural rubber or synthetic resin.

[0093] A discharge pipe (171) is connected to the lower part of the tub (120) to discharge the washing water inside the tub (120) from the tub (120). The discharge pipe (171) is connected to a pump module (1000) that pumps the washing water discharged from the tub (120). The pump module (1000) is configured to circulate the washing water discharged from the tub (120) back to the tub (120) or discharge it to the outside of the cabinet (110).

[0094] The pump module (1000) is connected to a drain pipe (173a) that drains the introduced washing water to the outside of the cabinet (110). The pump module (1000) is connected to a circulation pipe (174) that guides the introduced washing water back to the tub (120). When the washing water is pumped to the drain pipe (173a), the washing water is drained to the outside of the cabinet (110). When the washing water is pumped to the circulation pipe (174), the washing water is resupplied to the tub (120).

[0095] The pump module (1000) may include a drain pump (1220) and a circulation pump (1230). The drain pump (1220) pumps wash water into a drain pipe (173a). The circulation pump (1230) pumps wash water into a circulation pipe (174). The pump module (1000) will be described in detail with reference to a separate drawing.

[0096] Here, the drain hose (173a) may be extended by forming a trap in the drain hose (173a) provided on the outside of the washing machine (100). The circulation pipe (174) may be branched into at least two or more and may be connected to circulation nozzles (not shown) formed on both sides of the gasket (190).

[0097] Accordingly, when the pump module (1000) is operated, the washing water in the tub (120) is drained through the drain pipe (173a), or the washing water in the tub (120) is supplied back to the tub (120) through the circulation pipe (174).

[0098] The tub (120) can be hung on the cabinet (110) by a spring (not shown) so that vibrations generated when the drum (130) rotates can be buffered, and a damper (not shown) that supports the tub (120) from the bottom can be further provided. Meanwhile, a weight (124) that increases the weight of the tub (120) itself and raises the vibration limit of the tub can be provided at the front of the tub (120).

[0099] Fig. 3 is a partial cross-sectional view showing the internal structure of a garment treatment device according to one embodiment of the present invention. The internal structure of the garment treatment device according to the embodiment will be further described with reference to Fig. 3.

[0100] A motor (121) and a rotation shaft (122) for rotating a drum (130) may be provided at the rear of the tub (120). Here, the drum (130) may be classified into a direct drive type and an indirect drive type depending on the method of transmitting the driving force provided from the motor (121) to the drum (130).

[0101] Here, the direct drive method is one in which the rotational axis of the motor is directly connected to the drum (130), and the rotational axis of the motor and the center of the drum (130) are aligned on the same line. The washing machine (100) according to the present embodiment follows this direct drive method, and the drum (130) is rotated by the motor (121) provided at the rear of the tub (120), but it is not necessarily limited to this, and the indirect drive method described below is of course also possible.

[0102] In addition, the indirect drive method rotates the drum (130) by using a power transmission means such as a belt or pulley that transmits the driving force provided from the motor, and the rotational axis of the motor and the center of the drum (130) do not necessarily need to be aligned on the same line.

[0103] The drum (130) is provided inside the tub so as to be rotatable by receiving the rotational power of the motor (121) and connected to the above-described rotating shaft. A plurality of through holes (131) are formed on the inner surface of the drum (130) so that the washing water stored in the tub (120) can flow into the drum (130). One or more lifters (132) may be provided along the inner surface of the drum (130) so that the laundry put into the drum (130) can flow by the rotation of the drum (130).

[0104] The tub (120) and the drum (130) may be arranged horizontally with the ground, but alternatively, they may be arranged with a predetermined incline so that the rear part of the tub (120) and the drum (130) is lower than the front part.

[0105] A heater (123) may be further provided inside the tub (120) to heat the water stored in the tub (120).

[0106] FIG. 4 is a diagram illustrating a control unit of a clothes treatment device according to an embodiment of the present invention. The control unit (500) is a component that controls the components of the washing machine (100). The control unit (500) can control each component of the washing machine (100) by exchanging electrical signals with them. The control unit (500) can control the pump module (1000). In the embodiment, the control unit (500) can control the circulation pump (1230) and the drain pump (1230). In addition, although not shown in the drawing, the control unit (500) can also control various electrical components such as a water supply valve (143), a steam generator (160), a drying device (180), and a motor (121).

[0107] FIG. 5 is a schematic diagram illustrating a pump module according to an embodiment of the present invention. Referring to FIG. 5, a pump module (1000) according to an embodiment will be described.

[0108] The pump module (1000) may include an inlet (1010), a drain outlet (1020), and a circulation outlet (1030). The inlet (1010) is connected to a discharge pipe (171). The drain outlet (1020) is spaced apart from the inlet (1010) and connected to a drain pipe (173a). The circulation outlet (1030) is spaced apart from the inlet (1010) and the drain outlet (1020) and connected to a circulation pipe (174). The inlet (1010), the drain outlet (1020), and the circulation outlet (1030) are in fluid communication with each other.

[0109] The pump module (1000) may include a drain pump (1220) and a circulation pump (1230). The drain pump (1220) discharges the washing water discharged from the discharge pipe (171) into the drain pipe (173a). The circulation pump (1230) causes the washing water discharged from the discharge pipe (171) to flow into the circulation pipe (174).

[0110] The pump module (1000) includes a microfiber filter (1420). The microfiber filter (1420) is a filter that filters microfibers from wash water. The microfiber filter (1420) filters foreign substances or contaminants including microfibers from wash water before the wash water is discharged to the outside. The microfiber filter (1420) can be accommodated inside the first filter housing (1410). The microfiber filter (1420) filters microfibers from wash water when wash water introduced from the discharge pipe (171) is discharged to the outside through the drain outlet (1020). The microfiber filter (1420) is arranged between the water inlet (1010) and the drain outlet (1020). In addition, the microfiber filter (1420) is arranged between the circulation outlet (1030) and the drain outlet (1020).

[0111] The pump module (1000) includes a lint filter (1520). The lint filter (1520) is a filter that filters lint from wash water. The lint filter (1520) has larger filtration holes than the microfiber filter (1420). Therefore, foreign substances filtered by the lint filter (1520) are larger than foreign substances filtered by the microfiber filter (1420). Generally, the lint filter (1520) does not have a microfiber filtration performance. The lint filter (1520) may be accommodated inside the second filter housing (1510).

[0112] In the embodiment, the discharge pipe (171), the first filter housing (1410), and the drain pipe (173a) form a drainage path for washing water. The drainage path is a path through which washing water in the tub (120) is discharged to the outside of the cabinet (110).

[0113] In the embodiment, the discharge pipe (171), the second filter housing (1510), and the circulation pipe (174) form a circulation path for washing water. The circulation path is a path through which washing water in the tub (120) is circulated back to the tub (120).

[0114] Fig. 6 is a partial perspective view illustrating a pump module according to one embodiment of the present invention. Referring to Fig. 6, a pump module (1000) according to one embodiment will be described.

[0115] The pump module (1000) is positioned lower than the tub (120). In the embodiment, the pump module (1000) is positioned on the base plate of the washing machine (100). The pump module (1000) is connected to the discharge pipe (171), the drain pipe (173a), and the circulation pipe (174).

[0116] The pump module (1000) may include a first filter housing (1410), a second filter housing (1510), a drain pump (1220), and a circulation pump (1230).

[0117] Fig. 7 is an exploded perspective view of a pump module according to one embodiment of the present invention. The configuration of a pump module (1000) according to one embodiment will be described with reference to Fig. 7.

[0118] The pump module (1000) may include a first filter housing (1410), a microfiber filter (1420), a second filter housing (1510), a lint filter (1520), a drain pump (1220), a drain pump housing (1221), a circulation pump (1230), and a circulation pump housing (1231).

[0119] A first filter housing (1410) is provided with a first filter chamber (1411) in which a microfiber filter (1420) is positioned. The first filter chamber (1411) communicates with a water inlet (1010), a drain outlet (1020), and a circulation outlet (1030). The first filter chamber (1411) forms a drainage path.

[0120] A first housing inlet (1412) is formed in the first filter housing (1410). A first housing outlet (1413) is formed in the first filter housing (1410). In an embodiment, the first housing inlet (1412) may correspond to the water inlet (1010). The first housing outlet (1413) may correspond to the drain outlet (1020).

[0121] A connecting pipe (1415) leading to a circulation outlet (1030) may be provided on one side of the first filter housing (1410). The connecting pipe (1415) forms a circulation path. The connecting pipe (1415) communicates with the first housing inlet (1412). A circulation outlet (1416) is formed at an end of the connecting pipe (1415). In an embodiment, the connecting pipe (1415) is formed integrally with the first filter housing (1410). In an embodiment, the connecting pipe (1415) shares an inlet with the first filter housing (1410).

[0122] The first filter housing (1410) may further include a housing cover (1740) that shields one end. The housing cover (1740) may shield an end adjacent to the first housing inlet (1412) of the first filter housing (1410). For example, the housing cover (1740) may shield the rear end of the first filter housing (1410). However, the present invention is not limited thereto, and the position of the housing cover (1740) may vary depending on the exterior appearance of the first filter housing (1410).

[0123] The housing cover (1740) may be formed with a guide portion (1741) that can be introduced into the first filter housing (1410). The guide portion (1741) may guide the fluid introduced through the first housing inlet (1412) to flow toward the first filter chamber (1411).

[0124] A second sealing portion (1745) for sealing may be provided between the first filter housing (1410) and the housing cover (1740). The second sealing portion (1745) may be formed of a rubber or plastic material, but is not limited thereto.

[0125] The microfiber filter (1420) may be a mesh filter. The microfiber filter (1420) may include a filter frame (1422) and a mesh (1421). The filter frame (1422) supports the mesh (1421). The filter frame (1422) may support the microfiber filter (1420) so that its shape is maintained. The shapes of the mesh (1421) and the filter frame (1422) are exemplary and may be provided in various materials and shapes.

[0126] A microfiber filter (1420) is arranged between the first housing inlet (1412) and the first housing outlet (1413). The microfiber filter (1420) may have a cylindrical shape extending in the longitudinal direction. The direction in which the microfiber filter (1420) extends may be defined as the first direction. According to one embodiment, the microfiber filter (1420) may extend in the front-back direction.

[0127] The microfiber filter (1420) may be provided with a cylindrical peripheral surface as a filter surface. A mesh (1421) may be arranged on the filter surface. The rear side of the microfiber filter (1420) may be open. The open rear side functions as an inlet of the microfiber filter (1420). Washing water introduced through the inlet passes through the mesh (1421) on the peripheral surface of the microfiber filter (1420) and the microfibers are filtered. Washing water passing through the microfiber filter (1420) is discharged through the first housing outlet (1413).

[0128] A first cap (1430) may be positioned at the front of the first filter housing (1410). The first cap (1430) is configured to close the open front opening (1411a) of the first filter housing (1410). When the first cap (1430) is separated from the first filter housing (1410), the first filter chamber (1411) may be exposed to the outside. A grip portion (1430a) may be formed on the first cap (1430). A user may hold the grip portion (1430a) to separate the first cap (1430) from the first filter housing (1410).

[0129] The first cap (1430) can be coupled to the microfiber filter (1420) via the coupling portion (1431). When the first cap (1430) and the microfiber filter (1420) are coupled and provided as a single unit, the user can take out the microfiber filter (1420) from the first filter chamber (1411) simply by opening the first cap (1430). The pulled-out microfiber filter (1420) can be received and fixed in the first filter chamber (1411) again after replacement or washing.

[0130] A first sealing portion (1441) for sealing may be coupled to the first cap (1430). The first sealing portion (1441) may be coupled to the coupling portion (1431). The first sealing portion (1441) provides watertightness when the first cap (1430) closes the first filter chamber (1411). The first sealing portion (1441) may be an O-ring made of rubber or plastic.

[0131] In an embodiment, the microfiber filter (1420) may be supported by a filter support member (1442). The filter support member (1442) may strengthen the bonding strength when the microfiber filter (1420) is bonded to the first filter chamber (1411). The filter support member (1442) may guide the microfiber filter (1420) to be positioned in a set manner in the first filter chamber (1411).

[0132] A second filter chamber (1511) in which a lint filter (1520) is positioned is formed in the second filter housing (1510). A second housing inlet (1512) is formed in the second filter housing (1510). The second housing inlet (1512) is connected to the circulation outlet (1416). A second housing outlet (1513) is formed in the second filter housing (1510). In an embodiment, the second housing outlet (1513) may correspond to the circulation outlet (1030).

[0133] The lint filter (1520) may be a filter that filters out large foreign substances or contaminants. The lint filter (1520) is positioned between the inlet (1010) and the circulation outlet (1030). In an embodiment, the lint filter (1520) is positioned between the second housing inlet (1512) and the second housing outlet (1513) connected to the inlet (1010).

[0134] The lint filter (1520) may have a long shape in the longitudinal direction. The lint filter (1520) may extend in the front-back direction. The extension direction of the lint filter (1520) and the extension direction of the microfiber filter (1420) may be parallel.

[0135] Washing water flowing in through the second housing inlet (1512) is filtered as it passes through the lint filter (1520). Washing water passing through the lint filter (1520) is discharged through the second housing outlet (1513).

[0136] A second cap (1530) may be positioned at the front of the second filter housing (1510). The second cap (1530) is configured to close the open front opening (1511a) of the second filter housing (1510). When the second cap (1530) is separated from the second filter housing (1510), the second filter chamber (1511) may be exposed to the outside. A grip portion (1530a) may be formed on the second cap (1530). A user may hold the grip portion (1530a) to separate the second cap (1530) from the second filter housing (1510).

[0137] The second cap (1530) may be provided in combination with the lint filter (1520). The second cap (1530) may be positioned in front of the lint filter (1520). When the second cap (1530) and the lint filter (1520) are provided as a single unit, the user can take out the lint filter (1520) from the second filter chamber (1511) simply by opening the second cap (1530). The taken-out lint filter (1520) may be received and fixed in the second filter chamber (1511) again after replacement or washing.

[0138] A third sealing portion (1541) may be provided at the joint portion of the second cap (1530) and the lint filter (1520). The third sealing portion (1541) provides watertightness when the second cap (1530) closes the second filter chamber (1511). The third sealing portion (1541) may be an O-ring made of rubber or plastic.

[0139] The second filter housing (1510) may be positioned laterally relative to the first filter housing (1410). The first filter housing (1410) and the second filter housing (1510) may be positioned side by side from left to right when viewed from the front. The second filter housing (1510) may be positioned at a height equal to or lower than that of the first filter housing (1410).

[0140] The first filter housing (1410) may have a larger volume than the second filter housing (1510). In an embodiment, the length of the first filter housing (1410) is longer than the length of the second filter housing (1510). The circumference of the first filter housing (1410) is larger than the circumference of the second filter housing (1510).

[0141] The first filter chamber (1411) may have a larger volume than the second filter chamber (1511). In an embodiment, the length of the first filter chamber (1411) is longer than the length of the second filter chamber (1511). The circumference of the first filter chamber (1411) is larger than the circumference of the second filter chamber (1511).

[0142] Since the microfiber filter (1420) has a higher filtration capacity and lower permeability than the lint filter (1520), it is desirable to provide a wider filter area if possible. Accordingly, the volume of the first filter chamber (1411) that accommodates the microfiber filter (1420) is larger than the volume of the second filter chamber (1511) that accommodates the lint filter (1520).

[0143] In an embodiment, the front end of the first filter housing (1410) and the front end of the second filter housing (1510) are positioned on the same line. In an embodiment, the rear end of the first filter housing (1410) is positioned further rearward than the rear end of the second filter housing (1510).

[0144] The first housing inlet (1412) is located at the rear of the first filter housing (1410). The connecting pipe (1415) extends in the front-back direction to connect the first housing inlet (1412) and the second housing inlet (1512).

[0145] The pump module (1000) may further include a circulation pump (1230) that causes washing water to flow along a circulation path and a drain pump (1220) that causes washing water to flow along a drain path. The drain pump (1220) may be coupled to a drain pump housing (1221). The circulation pump (1230) may be coupled to a circulation pump housing (1321).

[0146] A drain pump housing (1221) forms a part of a drain passage. The drain pump housing (1221) can accommodate an impeller (1225) of a drain pump (1220). The drain pump housing (1221) can be coupled to a first filter housing (1410). The drain pump housing (1221) can be coupled to a first housing outlet (1413) of the first filter housing (1410). A first pump inlet (1222) and a first pump outlet (1223) are formed in the drain pump housing (1221). The first pump inlet (1222) is connected to the first housing outlet (1413). The first pump outlet (1223) is connected to a drain pipe (173a). In the embodiment, the first pump outlet (1223) may correspond to the drain outlet (1020).

[0147] When the drain pump (1220) operates, negative pressure may be generated in the first filter chamber (1411). The negative pressure in the first filter chamber (1411) caused by the drain pump (1220) may cause the washing water inside the first filter chamber (1411) to move to the drain pipe (173a).

[0148] The circulation pump housing (1231) forms a part of the circulation path. The circulation pump housing (1231) can accommodate the impeller (1235) of the circulation pump (1230). The circulation pump housing (1231) can be coupled to the second filter housing (1510). The circulation pump housing (1231) can be coupled to the second housing outlet (1513) of the second filter housing (1510). A second pump inlet (1232) and a second pump outlet (1233) are formed in the circulation pump housing (1231). The second pump inlet (1232) is connected to the second housing outlet (1513). The second pump outlet (1233) is connected to the circulation pipe (174). In the embodiment, the second pump outlet (1233) may correspond to the circulation outlet (1030).

[0149] When the circulation pump (1230) operates, negative pressure may be generated in the second filter chamber (1511). The washing water inside the second filter chamber (1511) may move to the circulation pipe (174) due to the negative pressure in the second filter chamber (1511) caused by the circulation pump (1230).

[0150] Fig. 8 is a cross-sectional perspective view of a pump module (1000) according to one embodiment of the present invention. The structure of the pump module (1000) will be described in more detail with reference to Fig. 8.

[0151] A first filter chamber (1411) is formed inside the first filter housing (1410). A microfiber filter (1420) is positioned in the first filter chamber (1411). The front of the first filter chamber (1411) is closed by a first cap (1430).

[0152] The microfiber filter (1420) may be provided in a cylindrical shape. The first filter chamber (1411) may also be formed in a cylindrical structure. The wall forming the first filter chamber (1411) and the microfiber filter (1420) may be spaced apart from each other.

[0153] A first chamber inlet (1411a) is formed at the rear of the first filter chamber (1411). The first chamber inlet (1411a) is connected to the first housing inlet (1412). In the embodiment, the first chamber inlet (1411a) is located downstream of the first housing inlet (1412).

[0154] The first housing inlet (1412) is connected to the discharge pipe (171). Washing water flowing into the first housing inlet (1412) passes through a flow path formed by the housing cover (1740) while flowing into the first chamber inlet (1411a). The housing cover (1740) may include a first guide surface (1741) and a second guide surface (1742). The first guide surface (1741) and the second guide surface (1742) form a flow path toward the first chamber inlet (1411a). The first guide surface (1741) and the second guide surface (1742) may be provided as an inclined surface. The first guide surface (1741) and the second guide surface (1742) can reduce the flow resistance when the washing water introduced through the first housing inlet (1412) moves to the first filter chamber (1411).

[0155] Washing water flowing into the first chamber inlet (1411a) flows into the interior of the microfiber filter (1420). The washing water is filtered as it passes through the filter surface of the microfiber filter (1420).

[0156] A first housing outlet (1413) is formed on the side of the first filter chamber (1411). Washing water that has passed through the microfiber filter (1420) exits the first filter chamber (1411) through the first housing outlet (1413).

[0157] The first housing outlet (1413) is connected to the drain pump housing (1221). Washing water that has exited the first filter chamber (1411) through the first housing outlet (1413) flows into the drain pump housing (1221). Washing water that has flowed into the drain pump housing (1221) flows out through the first pump outlet (1223).

[0158] The first pump outlet (1223) is connected to a drain pipe (173a). Washing water discharged through the first pump outlet (1223) is drained to the outside of the device through the drain pipe (173a).

[0159] The connecting pipe (1415) is connected to the first housing inlet (1412). The connecting pipe (1415) connects the discharge pipe (171) and the second filter housing (1510). A connecting passage (1415a) is formed inside the connecting pipe (1415). The connecting passage (1415a) is a part of the circulation passage. A circulation outlet (1416) is formed at an end of the connecting pipe (1415). The circulation outlet (1416) is connected to the second filter housing (1510). The second housing inlet (1512) of the second filter housing (1510) is connected to the circulation outlet (1416).

[0160] A second filter chamber (1511) is provided inside the second filter housing (1510). A lint filter (1520) is positioned in the second filter chamber (1511). The front of the second filter chamber (1511) is closed by a second cap (1530).

[0161] Washing water flowing into the second filter chamber (1511) through the second housing inlet (1512) passes through the lint filter (1520). The washing water is filtered while passing through the lint filter (1520). The filtered washing water exits the second filter chamber (1511) through the second housing outlet (1513). The second housing outlet (1513) is connected to the circulation pump housing (1321). The second housing outlet (1513) is connected to the second pump inlet (1232). The washing water that exits the second filter chamber (1511) flows into the circulation pump housing (1321). The washing water flowing into the circulation pump housing (1321) flows out through the second pump outlet (1233, see FIG. 7).

[0162] Fig. 9 is a cross-sectional view of a pump module according to one embodiment of the present invention, illustrating a circulation path and a drain path. The circulation path and the drain path will be described in more detail with reference to Fig. 9.

[0163] The circulation path can be formed so that washing water introduced through the first housing inlet (1412) flows toward the lint filter (1520) by the pumping action of the circulation pump (1230) and then flows out through the second housing outlet (1513, see FIG. 7). In addition, the fluid introduced through the second housing outlet (1513, see FIG. 7) can flow into the first housing inlet (1412) and be circulated. In the embodiment, the first housing inlet (1412) functions as the inlet (1010), and the second housing outlet (1513) functions as the circulation outlet (1030).

[0164] When a pump module (1000) according to one embodiment is mounted on a washing machine (100), washing water flowing out through the second housing outlet (1513) is supplied to the tub (120) through the circulation pipe (174). In the tub (120), washing operations, such as a washing operation, a rinsing operation, and a draining operation, are performed.

[0165] Washing water flowing into the first housing inlet (1412) may contain foreign substances generated during the washing process. In the washing machine (100), while washing is being performed, the washing water in the tub (120) may be circulated through a circulation path.

[0166] The drainage path may be formed so that fluid flows in from the first housing inlet (1412), passes through the microfiber filter (1420) by the pumping action of the drainage pump (1220), and is drained through the first pump outlet (1223). In an embodiment, the first housing inlet (1412) functions as the inlet (1010), and the first pump outlet (1223) functions as the drainage outlet (1020).

[0167] When the draining operation for draining the washing water inside the tub (120) is performed, the washing water flows into the drainage path described in Fig. 9.

[0168] Here, when a pump module (1000) according to one embodiment is mounted on a washing machine (100), washing water is discharged to the outside of the washing machine (100) through a drain pipe (173a) connected to a circulation pump housing (1321).

[0169] FIG. 10 is a drawing illustrating a method for cleaning a microfiber filter using a pump module according to an embodiment of the present invention. Referring to FIG. 10, a method for cleaning a microfiber filter will be described.

[0170] As the microfiber filter (1420) filters the wash water, a large amount of foreign substances accumulate in the microfiber filter (1420). The foreign substances accumulated in the microfiber filter (1420) are removed from the microfiber filter (1420) by utilizing the reverse flow of the wash water. The method for generating the reverse flow is as follows.

[0171] [Backflow of drained laundry water]

[0172] The backflow of the washing water is caused by either gravity or the operation of the circulation pump (1230).

[0173] When the draining operation is in progress, the drain pump (1220) operates. The drain pump (1220) operates by repeating operation and stop at least once. When the drain pump (1220) operates, the washing water stored in the tub (120) is drained. While the drain pump (1220) is operating, the washing water flows into the drain path referenced in FIG. 9. When the drain pump (1220) stops, the washing water flows backward in the direction referenced in FIG. 10.

[0174] Backflow of the washing water may occur naturally due to gravity when the drain pump (1220) stops and the pumping force is removed. In this case, it is preferable that at least a portion of the drain pipe (173a) be located higher than the microfiber filter (1420). Furthermore, it is preferable that at least a portion of the drain pipe (173a) be located higher than the maximum water level of the tub (120).

[0175] If the circulation pump (1230) is driven while the drain pump (1220) is stopped, the circulation pump (1230) pumps the washing water toward the circulation pipe (174), and since the drain outlet (1020) and the circulation outlet (1030, see FIG. 7) are in fluid communication, the washing water in the drain outlet (1020) flows backwards based on the drain path.

[0176] In other words, the circulation pump (1230) forms a fluid pressure to cause the washing water to flow in the circulation path, and the fluid pressure of the washing water generated by the circulation pump (1230) causes the washing water in the first filter chamber (1411) to flow in the direction of the first chamber inlet (1411a), so the washing water flows backward with respect to the drain path.

[0177] Figure 11 is a diagram illustrating the principle of cleaning a microfiber filter by reverse flow of wash water. When wash water reverses and enters the interior of the microfiber filter (1420), microfibers deposited on the microfiber filter (1420) are removed from the surface. The removed microfibers can escape from the first filter chamber (1411) through the first chamber inlet (1411a).

[0178] When the drain pump (1220) stops and the circulation pump (1230) is operated, the washing water flows in the direction of the circulation path, and the fine fibers that have formed into lumps due to sedimentation may be captured in the lint filter (1520). Although not shown, a separate capturing device for capturing the fine fibers may be provided.

[0179] Figure 12 is a flowchart illustrating a draining algorithm according to one embodiment of the present invention.

[0180] When the drainage operation is in progress, the drainage pump (1220) repeats operation and stop at least once.

[0181] In the embodiment, the draining step (S1) includes a step of driving a drain pump (S11) and a step of stopping the drain pump (S12). The step of driving the drain pump (S11) and the step of stopping the drain pump (S12) are repeated until draining is completed.

[0182] While the drain pump is stopped, the circulation pump is operated (S13). The circulation pump is operated while the drain pump is stopped, and is stopped before the drain pump is restarted or simultaneously with the drain pump being restarted (S14).

[0183] The washing effect of the microfiber filter (1420) can be increased by repeating the operation and stop of the drainage pump at least once.

[0184] In an embodiment, the operation time of the drain pump in the step (S11) of operating the drain pump may be longer than the stop time of the drain pump in the step (S12) of stopping the drain pump. The operation time of the drain pump may be at least twice the stop time of the drain pump. The operation time of the drain pump may be at most four times the stop time of the drain pump.

[0185] The drain pump stop time may be 3 seconds or more and 10 seconds or less. The drain pump stop time may be set by considering the delay between signal application and actual operation and the time required for the residual water in the drain pump to flow back. For example, if the time required for the residual water in the drain pump to flow back is approximately 2 to 3 seconds, the drain pump stop time may be set to approximately 4 seconds by considering the delay between signal application and actual operation. The drain pump stop time is the time required for the washing water to flow back from the drain pipe (173a) to the microfiber filter (1420).

[0186] The drain pump's operating time may be approximately 10 seconds. Drainage must be completed within a reasonable time. Failure to do so will result in a longer overall wash time. In an exemplary embodiment, the drain pump operating time may be set to 10 to 12 seconds, with the goal of draining approximately 10 liters within one minute using a mass-produced drainage capacity of 20 LPM.

[0187] The operation time and stop time of the drainage pump can be designed and changed by considering the structure of the microfiber filter, filtration type, and total drainage time.

[0188] While the drain pump is stopped, the backflow of washing water can be increased by operating the circulation pump, thereby improving the cleaning effect of the microfiber filter.

[0189] Clumped microfibers filtered through the microfiber filter are transported to the circulation circuit, where they can be captured by the lint filter. While microfibers were not previously captured by lint filters, clumped microfibers can now be captured by the lint filter. Because the lint filter also captures microfibers, it slows down the rate of microfiber deposition in the microfiber filter, extending its lifespan.

[0190] FIG. 13 is a drawing explaining a method of driving a drainage pump and a circulation pump during a drainage operation according to the first embodiment of the present invention.

[0191] In an embodiment, the step of driving the drain pump (S11) and the step of stopping the drain pump (S12) may be repeated periodically. The drain pump may be repeatedly driven for a certain period of time and stopped for a certain period of time.

[0192] In an embodiment, in the step of driving the circulation pump (S13), the driving time of the circulation pump may be the same as the stopping time of the drainage pump.

[0193] In an embodiment, the step of driving the circulation pump (S13) may be performed every time the step of stopping the drainage pump (S12) is performed.

[0194] FIG. 14 is a drawing explaining a method of driving a drainage pump and a circulation pump during a drainage operation according to a second embodiment of the present invention.

[0195] In an embodiment, in the step of driving the circulation pump (S13), the driving time of the circulation pump may be shorter than the stopping time of the drain pump. The circulation pump may be driven after a certain period of time has elapsed after the drain pump has stopped operating. The circulation pump may be driven before the drain pump is restarted.

[0196] In an embodiment, the step of driving the circulation pump (S13) may be performed every time the step of stopping the drainage pump (S12) is performed.

[0197] FIG. 15 is a drawing explaining a method of driving a drainage pump and a circulation pump during a drainage operation according to a third embodiment of the present invention.

[0198] In an embodiment, the step of driving the circulation pump (S13) may be performed in any one or more of the steps of stopping the drainage pump (S12) that are performed multiple times. That is, the circulation pump may be driven in at least one of the multiple sections in which the drainage pump is stopped.

[0199] FIG. 16 is a drawing explaining a method of driving a drainage pump and a circulation pump during a drainage operation according to a fourth embodiment of the present invention.

[0200] In an embodiment, the operating time of the step (S11) of operating the drain pump may decrease as the drainage time elapses. The stopping time of the step (S12) of stopping the drainage pump may be maintained despite the elapse of the drainage time. Although not illustrated, the stopping time of the drainage pump may increase as the drainage time elapses. Alternatively, the stopping time of the drainage pump may decrease as the operating time of the drainage pump decreases.

[0201] Fig. 17 is a schematic diagram illustrating a pump module according to another embodiment of the present invention. Referring to Fig. 17, a pump module (1000') according to another embodiment will be described.

[0202] The pump module (1000') may include an inlet (1010), a drain outlet (1020), and a circulation outlet (1030). The inlet (1010) is connected to a discharge pipe (171). The drain outlet (1020) is spaced apart from the inlet (1010) and connected to a drain pipe (173a). The circulation outlet (1030) is spaced apart from the inlet (1010) and the drain outlet (1020) and connected to a circulation pipe (174). The inlet (1010), the drain outlet (1020), and the circulation outlet (1030) are in fluid communication with each other.

[0203] The pump module (1000') may include a drain pump (1220) and a circulation pump (1230). The drain pump (1220) discharges the washing water discharged from the discharge pipe (171) into the drain pipe (173a). The circulation pump (1230) causes the washing water discharged from the discharge pipe (171) to flow into the circulation pipe (174).

[0204] The pump module (1000) includes a microfiber filter (1420). The microfiber filter (1420) is a filter that filters microfibers from wash water. The microfiber filter (1420) filters foreign substances or contaminants including microfibers from wash water before the wash water is discharged to the outside. The microfiber filter (1420) can be accommodated inside the first filter housing (1410). The microfiber filter (1420) filters microfibers from wash water when wash water introduced from the discharge pipe (171) is discharged to the outside through the drain outlet (1020). The microfiber filter (1420) is arranged between the water inlet (1010) and the drain outlet (1020). In addition, the microfiber filter (1420) is arranged between the circulation outlet (1030) and the drain outlet (1020).

[0205] The pump module (1000) includes a lint filter (1520). The lint filter (1520) is a filter that filters lint from wash water. The lint filter (1520) has larger filtration holes than the microfiber filter (1420). Therefore, foreign substances filtered by the lint filter (1520) are larger than foreign substances filtered by the microfiber filter (1420). Generally, the lint filter (1520) does not have a microfiber filtration performance. The lint filter (1520) may be accommodated inside the second filter housing (1510).

[0206] In the embodiment, the discharge pipe (171), the second filter housing (1510), the first filter housing (1410), and the drain pipe (173a) form a drainage path for washing water. The drainage path is a path through which washing water in the tub (120) is discharged to the outside of the cabinet (110). When following the drainage path, washing water flowing into the first filter housing (1410) passes through the microfiber filter (1420) and is drained to the drain outlet (1020).

[0207] In the embodiment, the discharge pipe (171), the second filter housing (1510), the first filter housing (1410), and the circulation pipe (174) form a circulation path for washing water. The circulation path is a path through which washing water in the tub (120) is circulated back to the tub (120). When following the circulation path, washing water flowing into the first filter housing (1410) does not pass through the microfiber filter (1420) but is discharged through the circulation outlet (1030).

[0208] Fig. 18 is an exploded perspective view of a pump module according to another embodiment of the present invention. Referring to Fig. 18, the configuration of a pump module (1000') according to another embodiment of the present invention will be described.

[0209] The pump module (1000') may include a first filter housing (1410), a microfiber filter (1420), a second filter housing (1510), a lint filter (1520), a drain pump (1220), a drain pump housing (1221), a circulation pump (1230), and a circulation pump housing (1231).

[0210] Fig. 19 is a cross-sectional perspective view of a pump module (1000') according to another embodiment of the present invention. The structure of the pump module (1000') will be described in more detail with reference to Fig. 18 and Fig. 19.

[0211] A first filter housing (1410) is provided with a first filter chamber (1411) in which a microfiber filter (1420) is positioned. The first filter chamber (1411) communicates with a water inlet (1010), a drain outlet (1020), and a circulation outlet (1030). The first filter chamber (1411) forms a drainage path.

[0212] A first housing inlet (1412) is formed in the first filter housing (1410). A first housing outlet (1413) is formed in the first filter housing (1410). In an embodiment, the first housing outlet (1413) may correspond to a drain outlet (1020).

[0213] A connecting pipe (1415) leading to a circulation outlet (1030) may be provided at the front of the first filter housing (1410). In an embodiment, the connecting pipe (1415) extends from the front of the first filter housing (1410). The connecting pipe (1415) selectively forms a drainage path and a circulation path. The connecting pipe (1415) communicates with the first housing inlet (1412). A circulation outlet (1416) is formed in the connecting pipe (1415).

[0214] In an embodiment, the connecting pipe (1415) is formed integrally with the first filter housing (1410). A first cap (1430) may be positioned at the front of the connecting pipe (1415). The first cap (1430) is configured to communicate with the first filter housing (1410) and close the open front opening (1411a) at the front of the connecting pipe (1415). When the first cap (1430) is separated from the connecting pipe (1415), the first filter chamber (1411) may be exposed to the outside. A grip portion (1430a) may be formed on the first cap (1430). A user may hold the grip portion (1430a) to separate the first cap (1430) from the connecting pipe (1415).

[0215] The microfiber filter (1420) may be a mesh filter. It may include a filter frame (1422) and a mesh (1421). The shapes of the mesh (1421) and the filter frame (1422) are exemplary and may be made of various materials and shapes.

[0216] The filter frame (1422) supports the mesh (1421). The filter frame (1422) can support the shape of the microfiber filter (1420) so that it is maintained.

[0217] The filter frame (1422) can be combined with the connecting frame (1432). The connecting frame (1432) is configured to connect the first cap (1430) and the microfiber filter (1420) to each other. The connecting frame (1432) can be combined with the connecting portion (1431). The first cap (1430) can be combined with the connecting frame (1432) via the connecting portion (1431). As a result, the first cap (1430) can be combined with the microfiber filter (1420).

[0218] When the first cap (1430) and the microfiber filter (1420) are combined and provided as one unit, the user can take out the microfiber filter (1420) from the first filter chamber (1411) simply by opening the first cap (1430). The taken out microfiber filter (1420) can be received and fixed in the first filter chamber (1411) again after replacement or washing.

[0219] The connecting frame (1432) can function as a lint filter. A filtering hole (1432a) can be formed in the connecting frame (1432). The filtering hole (1432a) of the connecting frame (1432) can be the same size as or larger than the filtering hole of the lint filter (1520). The filtering hole (1432a) of the connecting frame (1432) can perform the function of filtering clumped microfibers.

[0220] A microfiber filter (1420) is arranged between the first housing inlet (1412) and the first housing outlet (1413). The microfiber filter (1420) may have a cylindrical shape extending in the longitudinal direction. The direction in which the microfiber filter (1420) extends may be defined as the first direction. According to one embodiment, the microfiber filter (1420) may extend in the front-back direction.

[0221] The microfiber filter (1420) may have a cylindrical peripheral surface with a mesh (1421) arranged as a filter surface. The rear side of the microfiber filter (1420) may be open. The open rear side functions as an inlet of the microfiber filter (1420). Washing water introduced through the inlet passes through the mesh (1421) along the peripheral surface of the microfiber filter (1420), and the microfibers are filtered. Washing water that has passed through the microfiber filter (1420) is discharged through the first housing outlet (1413).

[0222] A second filter chamber (1511) in which a lint filter (1520) is positioned is formed in the second filter housing (1510). A second housing inlet (1512) is formed in the second filter housing (1510). The second housing inlet (1512) is connected to a discharge pipe (171). A second housing outlet (1513) is formed in the second filter housing (1510). In an embodiment, the second housing inlet (1512) may correspond to the inlet (1010).

[0223] The lint filter (1520) may be a filter that filters out large foreign substances or contaminants. The lint filter (1520) is positioned between the inlet (1010) and the circulation outlet (1030). In an embodiment, the lint filter (1520) is positioned between the second housing inlet (1512) and the second housing outlet (1513) that communicates with the circulation outlet (1030).

[0224] The lint filter (1520) may have a long shape in the longitudinal direction. The lint filter (1520) may extend in the front-back direction. The extension direction of the lint filter (1520) and the extension direction of the microfiber filter (1420) may be parallel.

[0225] Washing water flowing in through the second housing inlet (1512) is filtered as it passes through the lint filter (1520). Washing water passing through the lint filter (1520) is discharged through the second housing outlet (1513).

[0226] A second cap (1530) may be positioned in front of the lint filter (1520). The second cap (1530) is configured to close the open front opening (1511a) of the second filter housing (1510). When the second cap (1530) is separated from the second filter housing (1510), the second filter chamber (1511) may be exposed to the outside. A grip portion (1530a) may be formed on the second cap (1530). A user may hold the grip portion (1530a) to separate the second cap (1530) from the second filter housing (1510).

[0227] The second cap (1530) may be provided in combination with the lint filter (1520). If the second cap (1530) and the lint filter (1520) are provided as a single unit, the user can take out the lint filter (1520) from the second filter chamber (1511) simply by opening the second cap (1530). The taken-out lint filter (1520) may be received and fixed in the second filter chamber (1511) again after replacement or washing.

[0228] The second filter housing (1510) may be arranged laterally of the connecting pipe (1415). The connecting pipe (1415) and the second filter housing (1510) may be arranged side by side left and right when viewed from the front.

[0229] The first housing inlet (1412) is located at the front of the first filter housing (1410). The connecting pipe (1415) extends in the forward and backward direction to connect the first housing inlet (1412) and the second housing inlet (1512).

[0230] The pump module (1000) may further include a circulation pump (1230) that causes washing water to flow along a circulation path and a drain pump (1220) that causes washing water to flow along a drain path. The drain pump (1220) may be coupled to a drain pump housing (1221). The circulation pump (1230) may be coupled to a connecting pipe (1415).

[0231] A drain pump housing (1221) forms a part of a drain passage. The drain pump housing (1221) can accommodate an impeller (1225) of a drain pump (1220). The drain pump housing (1221) can be coupled to a first filter housing (1410). The drain pump housing (1221) can be coupled to a first housing outlet (1413) of the first filter housing (1410). A first pump inlet (1222) and a first pump outlet (1223) are formed in the drain pump housing (1221). The first pump inlet (1222) is connected to the first housing outlet (1413). The first pump outlet (1223) is connected to a drain pipe (173a). In the embodiment, the first pump outlet (1223) may correspond to the drain outlet (1020).

[0232] When the drain pump (1220) operates, negative pressure may be generated in the first filter chamber (1411). The negative pressure in the first filter chamber (1411) caused by the drain pump (1220) may cause the washing water inside the first filter chamber (1411) to move to the drain pipe (173a).

[0233] Washing water flowing into the first chamber inlet (1411a) according to the operation of the drain pump (1220) flows into the interior of the microfiber filter (1420). The washing water passes through the filter surface of the microfiber filter (1420) and is filtered.

[0234] A first housing outlet (1413) is formed on the side of the first filter chamber (1411). Washing water that has passed through the microfiber filter (1420) exits the first filter chamber (1411) through the first housing outlet (1413).

[0235] The first housing outlet (1413) is connected to the drain pump housing (1221). Washing water that has exited the first filter chamber (1411) through the first housing outlet (1413) flows into the drain pump housing (1221). Washing water that has flowed into the drain pump housing (1221) flows out through the first pump outlet (1223).

[0236] The first pump outlet (1223) is connected to a drain pipe (173a). Washing water discharged through the first pump outlet (1223) is drained to the outside of the device through the drain pipe (173a).

[0237] The circulation pump housing (1231) forms a part of the circulation path. The circulation pump housing (1231) can accommodate the impeller (1235) of the circulation pump (1230). The circulation pump housing (1231) can be coupled to a connecting pipe (1415). The circulation pump housing (1231) can be coupled to a circulation side outlet (1416) of the connecting pipe (1415). A second pump inlet (1232) and a second pump outlet (1233) are formed in the circulation pump housing (1231). The second pump inlet (1232) is connected to the second housing outlet (1513). The second pump outlet (1233) is connected to the circulation pipe (174). In an embodiment, the circulation outlet (1416) can function as a circulation outlet (1030). In an embodiment, the second pump outlet (1233) can function as a circulation outlet (1030).

[0238] When the circulation pump (1230) operates, negative pressure may be generated in the connecting passage (1415a) inside the connecting pipe (1415). Due to the negative pressure in the connecting passage (1415a) caused by the circulation pump (1230), the washing water inside the second filter chamber (1511) connected to the connecting passage (1415a) may move to the circulation pipe (174).

[0239] Washing water flowing into the second filter chamber (1511) through the second housing inlet (1512) passes through the lint filter (1520). The washing water is filtered while passing through the lint filter (1520). The filtered washing water exits the second filter chamber (1511) through the second housing outlet (1513). The second housing outlet (1513) is connected to a connecting pipe (1415). The second housing outlet (1513) is connected to a connecting pipe inlet (1417) formed on the side of the connecting pipe (1415). Washing water that exits the second filter chamber (1511) flows into the connecting passage (1415a). The washing water flowing into the connecting passage (1415a) flows into the circulation pump housing (1321). Washing water from the circulation pump housing (1321) flows out through the second pump outlet (1233).

[0240] The circulation path can be formed so that the washing water introduced through the second housing inlet (1512) flows toward the lint filter (1520) by the pumping action of the circulation pump (1230) and then flows out through the second housing outlet (1513). Then, the washing water discharged through the second pump outlet (1233) via the connecting path (1415a) is re-supplied to the tub (120). In the embodiment, the second housing inlet (1512) functions as the water inlet (1010), and the second pump outlet (1233) functions as the circulation outlet (1030).

[0241] When a pump module (1000) according to one embodiment is mounted on a washing machine (100), washing water flowing out through the second housing outlet (1513) is supplied to the tub (120) through the circulation pipe (174). In the tub (120), washing operations, such as a washing operation, a rinsing operation, and a draining operation, are performed.

[0242] The washing water flowing into the second housing inlet (1512) may contain foreign substances generated during the washing process. In the washing machine (100), the washing water in the tub (120) may be circulated through a circulation path while washing is being performed.

[0243] The drainage path may be formed so that fluid flows in from the second housing inlet (1512), passes through the lint filter (1520) and the microfiber filter (1420) by the pumping action of the drain pump (1220), and is drained through the first pump outlet (1223). In an embodiment, the second housing inlet (1512) functions as the inlet (1010), and the first pump outlet (1223) functions as the drain outlet (1020).

[0244] Here, when a pump module (1000') according to one embodiment is mounted on a washing machine (100), washing water is discharged to the outside of the washing machine (100) through a drain pipe (173a) connected to a circulation pump housing (1321).

[0245] The pump module (1000') can also wash the microfiber filter (1420) using the control method referenced through FIGS. 12 to 16. Although the detailed structure of the pump module (1000') is different, the control method is the same, so the preceding description is omitted.

Claims

1. Cabinet that forms the exterior; A tub located inside the cabinet and storing washing water; A drum rotatably provided inside the tub and containing laundry therein; A discharge pipe connected to the above tub to discharge washing water; A pump module that is combined with the discharge pipe to circulate the washing water discharged from the tub back to the tub or discharge it outside the cabinet; A circulation pipe that is combined with the above pump module and guides the washing water introduced into the pump module to the tub; and In combination with the above pump module, it includes a drain pipe that drains the washing water introduced into the pump module to the outside of the cabinet, The above pump module An inlet connected to the above discharge pipe; A drain outlet spaced apart from the above inlet, in fluid communication with the above inlet, and connected to the drain pipe; A circulation outlet spaced apart from the inlet and the outlet, in fluid communication with the inlet and the outlet, and connected to the circulation pipe; A microfiber filter that filters microfibers when the washing water flowing in from the discharge pipe is discharged to the outside through the drain outlet, and is placed between the circulation outlet and the drain outlet; A circulation pump that flows the washing water discharged from the discharge pipe into the circulation pipe; and Includes a drain pump that discharges the washing water discharged from the above discharge pipe into the above drain pipe, When the draining operation is in progress, the drain pump repeats operation and stop at least once to drain the washing water in the tub. A clothing treatment device characterized in that the above circulation pump is operated at least once during the stop time during which the above drain pump is stopped.

2. In paragraph 1, A clothing treatment device characterized in that the operating time of the circulation pump is shorter than or equal to the stopping time of the drain pump.

3. In paragraph 1, The above drainage pump repeats operation and stop multiple times, A clothing treatment device characterized in that the number of times the circulation pump is operated is less than or equal to the number of times the drain pump is stopped.

4. In paragraph 1, A clothing treatment device characterized in that the above circulation pump is driven in at least one section among the multiple sections in which the above drain pump is stopped.

5. In paragraph 1, A clothing treatment device characterized in that when the drainage pump stops operating, the circulation pump starts operating after a certain period of time.

6. In paragraph 1, A clothing treatment device characterized in that the above drainage pump is periodically driven and stopped.

7. In paragraph 1, A clothing treatment device characterized in that the operating time of the drain pump is longer than the stopping time of the drain pump.

8. In paragraph 7, A clothing treatment device characterized in that the operating time of the drain pump is at least two times and at most four times the stopping time of the drain pump.

9. In paragraph 8, A clothing treatment device characterized in that the stopping time of the above drainage pump is 3 seconds or more and 10 seconds or less.

10. In paragraph 9, A clothing treatment device characterized in that the stop time of the above drain pump is the time for ensuring reverse flow of washing water from the drain pipe to the microfiber filter.

11. In paragraph 1, A clothing treatment device characterized in that at least a portion of the drain pipe is located higher than the microfiber filter.

12. In paragraph 11, A clothes treatment device characterized in that at least a portion of the drain pipe is located above the maximum water level of the tub.

13. In paragraph 11, A garment treatment device characterized in that the pump module is positioned lower than the tub.

14. In paragraph 1, The above pump module A garment treatment device characterized in that it further includes a first filter housing that accommodates the microfiber filter and has a first filter chamber formed therein in fluid communication with the inlet, the drain outlet, and the circulation outlet.

15. In paragraph 14, A clothing treatment device characterized in that the above circulation pump forms negative pressure in the first filter chamber in the direction of the circulation outlet.

16. In paragraph 15, A clothing treatment device characterized in that the above drain pump forms negative pressure in the first filter chamber in the direction of the drain outlet.

17. In paragraph 16, The above pump module A clothing treatment device characterized in that it further includes a lint filter having larger filtering holes than the microfiber filter and filtering lint from the washing water, and is arranged between the water inlet and the circulation outlet.

18. In paragraph 17, The above pump module A garment treatment device characterized in that it further includes a second filter housing that accommodates the lint filter and has a second filter chamber formed therein in fluid communication with the inlet, the drain outlet, and the circulation outlet.

19. In paragraph 18, A clothing treatment device characterized in that the second filter housing is positioned at a height equal to or lower than the first filter housing.

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