Patent Publication Number: US-2023157515-A1

Title: Dish washer and method for controlling the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation application, under 35 U.S.C. § 111(a), of International Patent Application No. PCT/KR2022/014041, filed on Sep. 20, 2022, which claims the benefit of Korean Patent Application No. 10-2021-0164069, filed Nov. 25, 2021, in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference as a part of this application. 
    
    
     BACKGROUND 
     Field 
     The disclosure relates to a dish washer and method for controlling the same. 
     Description of Related Art 
     In general, dish washers refer to devices for cleaning dishes received therein by spraying high pressure water at the dishes and then drying the dishes. The dish washer operates such that water is sprayed at high pressure in a washing tub where the dishes are received and the spray of water reaches the dishes to wash off dirt such as food soiling on the surface of the dishes. 
     Specifically, the dish washer includes a tub with the washing tub formed therein and a sump installed underneath the tub to store water for washing. The water is moved into a spray nozzle by pumping action of a washing pump installed in the sump, and the water moved into the spray nozzle is sprayed at high pressure through a spray port formed at an end of the spray nozzle. The water sprayed at high pressure hits the surface of the dish to make dirt such as food soiling stuck to the dish falls to the bottom of the tub. 
     In the dish washer, water for washing is collected in the sump to be supplied into the tub. In this case, there is a demand for purified water to be collected in the sump. 
     SUMMARY 
     According to an embodiment of the disclosure, a dish washer includes a cabinet; a tub in the cabinet; a sump underneath the tub; a case brake on a side wall of the tub and connected to the sump; a water supply valve connected to an external water supply source; a filter assembly between the water supply valve and the case brake and including a plurality of flow path valves to open or close a plurality of flow paths corresponding to the plurality of flow path vales to guide water supplied from the external water supply source to the case brake; and a processor configured to open the water supply valve and one of the plurality of flow path valves at different points in time to start supplying the water, and close the water supply valve and the one of the plurality of flow path valves at different points in time to stop the supplying of the water. 
     The plurality of flow paths may include a filtering flow path and a bypass flow paths, and the plurality of flow path valves may include a first flow path valve to open or close the filtering flow path in which water supplied from the water supply source passes through a filter in the filter assembly and flows to the case brake; and a second flow path valve to open or close the bypass flow path in which water supplied from the water supply path bypasses the filter and flows to the case brake. 
     The processor may open the water supply valve after opening the first flow path valve or the second flow path valve first to start the supplying of the water. 
     The processor may close the first flow path valve or the second flow path valve after closing the water supply valve first to stop the supplying of the water. 
     The processor may control the first flow path valve or the second flow path valve to open one of the filtering flow path and the bypass flow path, based on at least one process included in a washing course. 
     The processor may control the first flow path valve to open the filter flow path for a last rinsing process of the at least one process. 
     The processor may determine whether to provide a notification of a filter replacement based on at least one of a number of times that the first flow path valve has opened, hours that the first flow path valve has opened and a period elapsed after installation of the filter. 
     The processor may accumulate the number of times that the first flow path valve has opened and control a user interface to provide the notification of the filter replacement based on the accumulated number of times being equal to a preset limited number. 
     The processor may determine hours of use of the filter by accumulating the hours of the first flow path valve has opened, and control the user interface to provide the notification of the filter replacement based on the hours of use of the filter being equal to preset limited hours. 
     The processor may control the user interface to provide the notification of the filter replacement based on a period of time elapsed after the installation of the filter corresponding to a recommended period of time for the filter replacement. 
     The dish washer may further include a flowmeter measuring an amount of water flowing into the case brake, and the processor may calculate an accumulated amount of water having passed through the filter and flowing into the case brake after the first flow path valve is opened, and determining whether to provide the notification of the filter replacement based on the accumulated amount of water calculated. 
     The processor may be further configured to sequentially open the water supply valve at a first point in time and the one of the plurality of flow path valves at a second point in time to start the supplying of the water, and sequentially close the water supply valve at a third point in time and the one of the plurality of flow path valves at a fourth in time to stop the supplying of the water. 
     According to an embodiment of the disclosure, a method of controlling a dish washer a sump, and a case brake connected to the sump, may include determining, by the processor, at least one process to perform included in a washing course, determining whether to operate a water supply valve connected to an external water supply source and one of a plurality of flow path valves included in a filter assembly located between the water supply valve and a case brake to open or close a plurality of flow paths corresponding to the plurality of flow path valves to guide water supplied from the external water supply source to the case brake, based on the determined at least one process; in response to the determining whether to operate of opening the water supply valve and one of the plurality of flow path valves at different points in time to start supplying the water; and closing the water supply valve and the one of the plurality of flow path valves at different points in time to stop the supplying of the water. 
     The plurality of flow path valves may include a first flow path valve to open or close a filtering flow path in which the water supplied from the external water supply source passes through a filter in the filter assembly and flows to the case brake; and a second flow path valve to open or close a bypass flow path in which the water supplied from the external water supply source bypasses the filter and flows to the case brake, and the determining of whether to operate of may include determining whether to operate the first flow path valve or the second flow path valve to open the one of the filtering flow path and the bypass flow path, based on the determined at least one process. 
     The opening may include opening of the water supply valve and one of the plurality of flow path valves the water supply valve after opening the first flow path valve or the second flow path valve first to start the supplying of the water. 
     The closing of the water supply valve and one of the plurality of flow path valves may include closing the first flow path valve or the second flow path valve after closing the water supply valve first to stop the supplying of the water. 
     The operation of the first flow path valve to open the filtering flow path may be performed in a last rinsing process of the at least one process. 
     The method may further include determining whether to provide a notification of a filter replacement based on at least one of a number of times that the first flow path valve has opened, hours that the first flow path valve has opened or a period of time elapsed after an installation of the filter. 
     The determining of whether to provide the notification of the filter replacement may include accumulating the number of times that the first flow path valve has opened; and providing the notification of the filter replacement based on the accumulated number of times being equal to a preset limited number. 
     The determining of whether to provide the notification of the filter replacement may include determining hours of use of the filter by accumulating hours that the first flow path valve has opened; and providing the notification of the filter replacement based on the hours of use of the filter being equal to preset limited hours. 
     The determining of whether to provide the notification of the filter replacement may include providing the notification of filter replacement based on the period of time elapsed after the installation of the filter corresponding to a recommended period of time for the filter replacement. 
     The opening of the water supply valve and the one of the plurality of flow path valves may further comprise sequentially opening the water supply valve at a first point in time and the one of the plurality of flow path valves at a second point in time to start the supplying of the water, and the closing of the water supply valve and the one of the plurality of flow path valves further comprises sequentially closing the water supply valve at a third point in time and the one of the plurality of flow path valves at a fourth in time to stop the supplying of the water. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a side cross-sectional view of a dish washer, according to an embodiment. 
         FIG.  2    illustrates a case brake coupled to one side of a tub of a dish washer, according to an embodiment. 
         FIG.  3    is a perspective view illustrating some components of a dish washer, according to an embodiment. 
         FIG.  4    is a perspective view illustrating the dish washer of  FIG.  3    viewed from a different angle. 
         FIG.  5    illustrates a sump, a case brake and a filter assembly of a dish washer, according to an embodiment. 
         FIG.  6    is a block diagram illustrating a flow of water in a dish washer, according to an embodiment. 
         FIG.  7    is an exploded perspective view of a case of a case brake, according to an embodiment. 
         FIG.  8    is a plan view of a second case of the case brake shown in  FIG.  7   . 
         FIG.  9    is a perspective view of a filter assembly, according to an embodiment. 
         FIG.  10    is a perspective view illustrating the filter assembly shown in  FIG.  9    viewed from a different angle. 
         FIG.  11    is an exploded perspective view of a filter assembly, according to an embodiment. 
         FIG.  12    is a cross-sectional view of the dish washer of  FIG.  3    cut along A-A′. 
         FIG.  13    illustrates a filtering flow path as an example of a flow path formed by a filter assembly. 
         FIG.  14    illustrates a bypass flow path as an example of another flow path formed by a filter assembly. 
         FIG.  15    is a control block diagram of a dish washer, according to an embodiment. 
         FIG.  16    is a time sequence chart illustrating control timing of a water supply valve and a valve of a filter assembly. 
         FIG.  17    is a flowchart illustrating a method of controlling a valve of a dish washer, according to an embodiment. 
         FIG.  18    is a flow chart illustrating the method of controlling the dish washer described in  FIG.  17    in more detail. 
         FIG.  19    is a flowchart illustrating a method of providing a notification of filter replacement of a dish washer, according to an embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Embodiments and features as described and illustrated in the disclosure are merely examples, and there may be various modifications replacing the embodiments and drawings at the time of filing this application. 
     Throughout the drawings, like reference numerals refer to like parts or components. For the sake of clarity, the elements of the drawings are drawn with exaggerated forms and sizes. 
     It will be further understood that the term “connect” or its derivatives refer both to direct and indirect connection, and the indirect connection includes a connection over a wireless communication network. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present disclosure. It is to be understood that the singular forms “a,” “&#39;an,” and “the” include plural references unless the context clearly dictates otherwise. It will be further understood that the terms “comprise” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     The terms including ordinal numbers like “first” and “second” may be used to explain various components, but the components are not limited by the terms. The terms are only for the purpose of distinguishing a component from another. Thus, a first element, component, region, layer or room discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the disclosure. Descriptions shall be understood as to include any and all combinations of one or more of the associated listed items when the items are described by using the conjunctive term “˜ and/or ˜,” or the like. 
     Furthermore, the terms, such as “˜ part”, “˜ block”, “˜ member”, “˜ module”, etc., may refer to a unit of handling at least one function or operation. For example, the terms may refer to at least one process handled by hardware such as field-programmable gate array (FPGA)/application specific integrated circuit (ASIC), etc., software stored in a memory, or at least one processor. 
     Reference numerals used for method steps are just used to identify the respective steps, but not to limit an order of the steps. Thus, unless the context clearly dictates otherwise, the written order may also be practiced otherwise. 
     Embodiments of the disclosure will now be described with reference to the accompanying drawings. 
       FIG.  1    is a side cross-sectional view of a dish washer, according to an embodiment.  FIG.  2    illustrates a case brake coupled to one side of a tub of a dish washer, according to an embodiment. 
     Referring to  FIGS.  1  and  2   , the dish washer  1  may include a main body  10  that defines an exterior of the dish washer  1 . The main body  10  may include a cabinet  11  that defines the exterior of the dish washer and a tub  12  arranged in the cabinet  11 . The tub  12  may be shaped substantially like a box. One side of the tub  12  may be opened. That is, the tub  12  may include an open portion  12   a . For example, the front side of the tub  12  may be opened. 
     The dish washer  1  may further include a door  20  arranged to open or close the open portion  12   a  of the tub  12 . The door  20  may be installed on the main body  10  to open or close the open portion  12   a  of the tub  12 . The door  20  may be installed at the cabinet  11  to be pivotable. 
     The dish washer  1  may further include a storage container provided in the tub  12  to receive dishes. The storage container may include a plurality of baskets  51 ,  52  and  53 . Dishes having relatively large volume may be received in the plurality of baskets  51 ,  52  and  53 . However, the types of the dishes to be received in the plurality of baskets  51 ,  52  and  53  are not limited to the dishes having relatively large volume. That is, not only the dishes having relatively large volume but also dishes having relatively small volume may be received in the plurality of baskets  51 ,  52  and  53 . 
     The plurality of baskets  51 ,  52  and  53  may include a middle basket  52  located in the middle in a direction of the height of the dish washer  1  and a lower basket  51  located in a lower portion in the direction of the height of the dish washer  1 . The middle basket  52  may be arranged to be supported on a middle guide rack  13   a , and the lower basket  51  may be arranged to be supported on a lower guide rack  13   b . The middle guide rack  13   a  and the lower guide rack  13   b  may be installed on the inner side of a side wall  12   d  of the tub  12  to be slidable toward the open portion  12   a  of the tub  12 . 
     The plurality of baskets  51 ,  52  and  53  may include an upper basket  53  located in an upper portion in the direction of height of the dish washer  1 . The upper basket  53  may be formed in the shape of a rack assembly to receive dishes having relatively small volume. It may be desirable to use the upper basket  53  to receive cooking tools or cutleries such as dippers, knives, turners, etc. Small cups such as espresso cups may also be received in the rack assembly. However, the types of dishes to be received in the upper basket  53  are not limited thereto. 
     The dish washer  1  may further include a sump  70  for storing water for washing. The dish washer  1  may include a washing chamber C, a space formed by insides of the tub  12 . The washing chamber C is a room where the dishes contained in the baskets  51 ,  52  and  53  may be washed and dried. The washing chamber C may be defined as an inside space of the tub  12  formed by a top wall  12   f , side walls  12   d , a front wall (not shown), a rear wall  12   c , a bottom  12   b , and the sump  70  linked to the bottom  12   b.    
     The dish washer  1  may further include spraying units  41 ,  42  and  43  provided to spray water for washing. The spraying units  41 ,  42  and  43  may include a first spraying unit  41  arranged under the lower basket  51  in the direction of height of the dish washer  1 , a second spraying unit  42  arranged under the middle basket  52  in the direction of height of the dish washer  1 , and a third spraying unit  43  arranged above the upper basket  53  in the direction of height of the dish washer  1 . 
     The first spraying unit  41  may be arranged to be rotatable on a first rotation axis  41   a , the second spraying unit  42  may be arranged to be rotatable on a second rotation axis  42   a , and the third spraying unit  43  may be arranged to be rotatable on a third rotation axis  43   a.    
     It is not, however, limited to the embodiment of the disclosure, and the first spraying unit  41  may be arranged to be fixed on a side of the bottom  12   b  unlike the second spraying unit  42  and the third spraying unit  43 . In this case, the first spraying unit  41  may be provided to substantially horizontally spray water for washing through a fixed nozzle, and the water for washing sprayed horizontally from the nozzle of the first spraying unit  41  may be turned in another direction by a switching assembly (not shown) arranged in the washing chamber C to move upward. 
     The third spraying unit  43  may spray the water for washing toward the dishes received in the upper basket  53 , the middle basket  52  and the lower basket  51 , and the second spraying unit  52  may spray the water for washing toward the dishes received in the middle basket  52  and the upper basket  53 . The first spraying unit  41  may be coupled to the tub bottom  12   b  unlike the second spraying unit  42  and the third spraying unit  43 . Specifically, the first spraying unit  41  may be arranged to be fixed to the sump  70 . 
     The dish washer  1  may include a circulation pump  30  for pumping water stored in the sump  70  into the spraying units  41 ,  42  and  43 . The water for washing pumped by the circulation pump  30  may be supplied into the first spraying unit  41  through an alternator  80  connected to the circulation pump  30  or may be moved upward by a duct  60  and supplied into the second spraying unit  42  or the third spraying unit  43 . 
     As described above, the water for washing stored in the sump  70  or water for washing brought into the dish washer  1  from outside may be moved to the alternator  80  by the circulation pump  30 . The alternator  80  may provide the water for washing to the first spraying unit  41  through a connector (not shown) connected to the first spraying unit  41 , and provide the water for washing to the duct  60  through a flow path connected to the duct  60 . 
     The alternator  80  may selectively provide the water for washing to at least one of the connector and the duct  60 . The alternator  80  may be arranged in a machine room L arranged under the washing chamber C. 
     The dish washer  1  may include the machine room L arranged under the tub  12 . The machine room L may be formed by a lower frame  14  and a bottom plate  15 . In the machine room L, components such as the circulation pump  30 , the sump  70 , the alternator  80 , etc., may be placed and a water supply hose and a drain hose, which will be described later, may be placed. 
     The dish washer  1  may include a case brake  100  coupled onto the side wall  12   d  of the tub  12 . For example, the case brake  100  may be coupled onto an outer wall of the tub. The case brake  100  may be arranged in a lower portion of the outer wall of the tub  12 . The case brake  100  may receive water from a filter assembly  200 . The case brake  100  may lead water to the sump  70 . In  FIG.  2   , a hose that connects the case brake  100 , the sump  70  and/or the filter assembly  200  are not shown. 
     The case brake  100  is provided to be connected to a link hole  12   e  formed on the side wall  12   d  of the tub  12 . For example, a tub link hole  113  of the case brake  100  and the link hole  12   e  of the tub may be linked to each other. 
     The case brake  100  includes a case  110 . The case  110  may be coupled to the side wall  12   d  of the tub  12 . The case  110  may include the tub link hole  113  formed at a second case  112  for the case brake  100  to be coupled to the side wall  12   d  of the tub  12 . The tub link hole  113  may be coupled to an outer wall of the tub  12  by a coupling member (not shown) coupled to an inner wall of the tub  12 . 
     The dish washer  1  may include the filter assembly  200  for filtering water to be supplied to the sump  70  from the outside. The filter assembly  200  may receive water from the outside. The filter assembly  200  is arranged upstream of the case brake  100  to enable purified water to flow to the case brake  100 . The filter assembly  200  may be placed underneath the tub  12 . 
     The filter assembly  200  may be arranged in the machine room L. For example, part of the filter assembly  200  may be arranged underneath the tub bottom  12   b . The filter assembly  200  may be accommodated in the cabinet  11 . Hence, the filter assembly  200  may not be exposed to the outside unless the door  20  is opened. However, part of the filter assembly  200  may go through the tub bottom  12   b  to be exposed to the inside of the washing chamber C. 
     The user may replace a filter in the filter assembly  200  by opening the washing chamber C. For example, part of the filter assembly  200  may be arranged underneath the tub  12 , and the other part of the filter assembly  200  may go through the tub bottom  12   b  to be arranged in the washing chamber C. To replace the filter, the user may open the washing chamber C, separate a case cover  230  of the filter assembly  200 , and replace a filter  220  accommodated in the filter assembly  200 . 
     As the filter assembly  200  is arranged in the cabinet  11 , even when there is a water leak from the filter assembly  200 , the water may not leak out of the cabinet  11 . Accordingly, furniture around the dish washer  1  may not be damaged. Furthermore, there may be a water leak sensor  320  on the bottom plate  15 , and a notification of water leak may be provided through a user interface  310  when there is a water leak from the filter assembly  200 . 
       FIG.  3    is a perspective view illustrating some components of a dish washer, according to an embodiment.  FIG.  4    is a perspective view illustrating the dish washer of  FIG.  3    viewed from a different angle.  FIG.  5    illustrates a sump, a case brake and a filter assembly of a dish washer, according to an embodiment. 
     The case brake  100 , the sump  70  and/or the filter assembly  200  are connected by a hose, but the hose is not shown in the drawings to clearly illustrate structural features. In  FIG.  5   , the case brake  100  is rotated at 90 degrees from the sump  70  and the filter assembly  200 . 
     Referring to  FIGS.  3  and  4   , the dish washer  1  may include the tub  12 , the sump  70 , the case brake  100  and the filter assembly  200 . The filter assembly  200  may be arranged in the cabinet  11 . The filter assembly  200  may be arranged in the machine room L. The filter assembly  200  may be arranged underneath the tub bottom  12   b . However, part of the filter assembly  200  may be exposed to the inside of the washing chamber C from the tub bottom  12   b.    
     The filter assembly  200  may include an inflow tube  211   a , outflow tubes  211   b  and  212   b , and a flow path valve  250 . The inflow tube  211   a  may be connected to a water supply source  400  outside the dish washer  1 . Water may be supplied to the filter assembly  200  from the water supply source  400  through the inflow tube  211   a . The water supply source  400  may be connected and coupled to a water supply valve  410 . In response to opening or closing the water supply valve  410 , inflow of water to the dish washer  1  from the water supply source  400  may be allowed or blocked. When the water supply valve  410  is opened, water may flow into the filter assembly  200  through the inflow tube  211   a.    
     The outflow tubes  211   b  and  212   b  may enable the water that has passed through the filter assembly  200  to flow to the case brake  100 . The outflow tubes  211   b  and  212   b  may be connected through the inflow tube  151  of the case brake  100  and an inflow hose  151   a . The outflow tubes  211   b  and  212   b  may be provided in the plural. The outflow tubes  211   b  and  212   b  may include the first outflow tube  211   b  and the second outflow tube  212   b . The first outflow tube  211   b  and the second outflow tube  212   b  may be connected to the inflow tube  151  of the case brake  100 . 
     The flow path valve  250  may be formed between the water supply valve  410  and the case brake  100  to open or close a flow path that leads water to the case brake  100 . The flow path valve  250  may open or close each of a flow path in which water brought into the filter assembly  200  passes through the filter  220  and a flow path in which the water bypasses the filter  220 . The flow path valve  250  may include a solenoid valve and/or a thermo actuator  250 . The type of the flow path valve  250  is not, however, limited to the example, and various other types of valves may be used. For example, the flow path valve  250  may include a three-way valve or a four-way valve. 
     The flow path valve  250  may be provided in the plural. The plurality of flow path valves  250  may include a first flow path valve  251  and a second flow path valve  252 . When the first flow path valve  251  is opened, the water that has been filtered in the filter assembly  200  may flow to the case brake  100  through the first outflow tube  211   b . When the second flow path valve  252  is opened, the water that has not been filtered in the filter assembly  200  but bypassed the filter  220  may flow to the case brake  100  through the second outflow tube  212   b . The first flow path valve  251  may be referred to as a filtering flow path valve  251 . The second flow path valve  252  may be referred to as a bypass flow path valve  252 . 
     When water supply into the dish washer  1  is not required, both the bypass flow path and the filtering flow path may remain closed. In other words, in a case that water supply into the dish washer  1  is not required, both the first flow path valve  251  and the second flow path valve  252  may be kept closed. A processor  520  of the dish washer  1  may selectively open the first flow path valve  251  and the second flow path valve  252  when water supply into the dish washer  1  is required. Depending on whether purified water is required to be supplied, one of the first flow path valve  251  and the second flow path valve  252  may be opened while the other may be kept closed. 
     Referring to  FIG.  5   , the sump  70  may include a water collector  71 , a seat  72 , a drain tube  73 , a check valve  74 , a drain pump coupler  75 , and a sump inflow tube  76 . The water collector  71  may collect water that has sequentially passed the filter assembly  200  and the case brake  100 . The water collector  71  may be opened to collect water. The water collector  71  may be an opening of the sump  70 . The tub bottom  12   b  may be seated on the seat  72 . The tub  12  may be coupled to the sump  70 . For example, the tub bottom  12   b  may be penetrated by and coupled to a coupling projection  72   a  formed at the seat  72 . 
     The drain tube  73  may be provided to drain water collected in the water collector  71 . The drain tube  73  may allow water to flow into a sump drain connection tube  153  of the case brake  100  through a drain hole  73   a . The water brought into the case brake  100  through the sump drain connection tube  153  may drain to the outside through a drain hose connection tube  154 . 
     The drain tube  73  may be coupled to the check valve  74 . The check valve  74  may prevent the water from flowing backward. The check valve  74  may be coupled to an end of the drain tube  73 . 
     The sump inflow tube  76  may allow the water that has sequentially passed the filter assembly  200  and the case brake  100  to be collected in the sump  12 . The sump inflow tube  76  may be connected to an extra hose  152   a  connected to the outflow tube  152  of the case brake  100 . Accordingly, the water in the case brake  100  may be connected to the sump  70  through the sump inflow tube  76  and collected in the water collector  71 . The drain pump coupler  75  may be coupled to a drain pump (not shown) that pumps water so that the water collected after a washing process drains. 
     The case brake  100  may include the case  110  and tubes  150  arranged in a lower portion of the case. Water to be supplied to the sump  70  and water draining from the sump  70  may flow in the case  110  through the tubes  150 . In  FIG.  5   , the case brake  100  is rotated at 90 degrees from the sump  70  and the filter assembly  200 . 
     The case brake  100  includes the case  110 . The case  110  may be coupled to the side wall  12   d  of the tub  12 . The case  110  may include the tub link hole  113  formed at the second case  112  for the case brake  100  to be coupled to the side wall  12   d  of the tub  12 . The tub link hole  113  may be coupled to the outer wall of the tub  12  by the coupling member (not shown) coupled to the inner wall of the tub  12  (see  FIGS.  2  and  3   ). 
       FIG.  6    is a block diagram illustrating a flow of water in a dish washer, according to an embodiment. 
     Referring to  FIG.  6   , water may flow into the filter assembly  200  through the water supply source  400  outside the dish washer  1 . The filter assembly  200  may purify the water brought in and lead the purified water to the case brake  100  or lead the original water brought in to the case brake  100 . The filter assembly  200  may include the filter  220 , and water may be filtered by the filter  220 . 
     The water supply source  400  may supply water into the inflow tube  211   a  of the filter assembly  200 . The water may flow into the filter assembly  200  through the inflow tube  211   a  of the filter assembly  200  from the water supply source  400 . In response to opening or closing the water supply valve  410 , inflow of the water to the filter assembly  200  from the water supply source  400  may be allowed or blocked. 
     The case brake  100  may be arranged in a higher position than the filter assembly  200 . For example, an inlet  121  of the case brake  100  may be arranged in a higher position than outlets  240   b  and  240   c  of the filter assembly  200 . Even though the filter assembly  200  is in a lower position than the case brake  100 , the water that has passed the filter assembly  200  may flow into the case  110  of the case brake  100  through the inlet  121  of the case brake  100  due to pressure of the water supplied from the water supply source  400 . 
     The water that has passed the case brake  100  may flow into the sump  70 . The water flowing into the sump  70  may flow into a spraying unit  40  through the alternator  80 . Specifically, the water supplied from the outside may flow to the filter assembly  200 , the case brake  100 , and the sump  70  in sequence. 
     The bottommost portion of the case brake  100  may be in a higher position than the water collector  71  of the sump  70 . For example, an outlet  122  formed at a bottom of the case brake  100  and lower ends of the tubes  150  arranged at the bottom may be in higher positions than the highest position of the water collector  71 . Potential energy of the water in the case brake  100  is greater than potential energy of water in the sump  70 , so the water collected in the sump  70  may not flow backward to the case brake  100 . 
       FIG.  7    is an exploded perspective view of a case of a case brake, according to an embodiment.  FIG.  8    is a plan view of a second case of the case brake shown in  FIG.  7   . 
     Referring to  FIGS.  7  and  8   , a dish washer according to an embodiment of the disclosure may include the case brake  100 . The case brake  100  may include the case  110 , an internal flow path  120 , an air brake  130 , a flowmeter  140 , and the plurality of tubes  150 . 
     The case  110  may include a first case  111  and the second case  112 . The first case  111  may include a tub link hole cover  111   a  that covers the tub link hole  113  formed in the second case  112 , and a flowmeter cover  111   b  that covers the flowmeter  140  seated in the second case  112 . The first case  111  may become a cover. 
     The tub link hole cover  111   a  may be arranged in a position corresponding to the tub link hole  113  when the first case  111  and the second case  112  are coupled together. The flowmeter cover  111   b  may be arranged in a position corresponding to the position of the flowmeter  140  when the first case  111  and the second case  112  are coupled together. 
     The case brake  100  may include an outer link hole  112   a , an inner link  112   b , and the tub link hole  113 . The outer link hole  112   a , the inner link  112   b , and the tub link hole  113  may be formed in the second case  112 . The outer link hole  112   a  may maintain pressure balance by forcing air in the case  110  to flow through to the outside of the dish washer. The position in which the outer link hole  112   a  is formed is not limited, and the outer link hole  112   a  may be formed in various positions such as top, bottom, sides, etc., of the second case  112 . The inner link  112   b  may be formed in the second case  112  for the air in the case  110  to flow through. The inner link  112   b  may be linked to the tub link hole  113  and/or the outer link hole  112   a . The tub link hole  113  may be linked to the tub  12  and the case brake  100 . The case brake  100  may be coupled to the side wall  12   d  of the tub through a screw thread (screw groove) of a coupling member (not shown) coupled to a screw groove (screw thread) formed in a tub link hole forming part  113   a  at an inner wall of the tub  12 . 
     The case brake  100  may further include an air brake chamber  160 . The air brake chamber  160  may be formed in the second case  112 . The air brake chamber  160  may be linked to the air brake  130  and may accommodate water discharged from the air brake hole  130   a . The air brake chamber  160  may be connected to the inner link  112   b . The inner link  112   b  may be linked to the outer link hole  112   a  and/or the tub link hole  113 , and accordingly, air in the case  110  and/or internal flow path  120  may have pressure balance. 
     The internal flow path  120  may be arranged in the case  100 . The internal flow path  120  may be formed by flow path forming walls  120   a  formed in the case  100 . The internal flow path  120  may include the inlet  121  and the outlet  122 . The internal flow path  120  may be formed by flow path forming walls  120   a  in the case  100 . The internal flow path  120  may include a first internal flow path  123  and a second internal flow path  124 . The first internal flow path  123  may lead water such that the water brought into the case  110  through the inlet  121  flows into the air brake  130 . The second internal flow path  124  may lead water such that the water having passed the air brake  130  flows out to the sump  70 . 
     The flowmeter  140  may be provided in the case  110  of the case brake  100 . The flowmeter  140  may measure the amount of water having passed the filter assembly  200  and flowing into the case brake  100 . The water brought into the internal flow path  120  through the inlet  121  of the case brake  100  from the filter assembly  200  may sequentially pass through the flowmeter  140  and the air brake  130  and may then be supplied to the sump  70  through the outlet  122  of the case brake  100 . 
     As the water having passed the filter assembly  200  is brought into the case brake  100 , the flowmeter  140  in the case brake  100  is able to measure the amount of flow of the water that has passed the filter assembly  200 . The water is supplied directly to the sump  70  through the case brake  100 , so that the same amount of water as the value of water flow measured by the flowmeter  140  may be supplied to the sump  70 . In other words, there may be little error between the amount of water flow measured by the flowmeter  140  and the amount of water flow in the sump collector  71 . 
     The flowmeter  140  may transmit an electric signal and/or data corresponding to the measured amount of water flow to a controller  500 . The controller  500  may control an amount of water to be collected in the sump  70  or sprayed into the washing chamber C based on the signal and/or data received from the flowmeter  140 . 
     The water that has passed the flowmeter  140  may flow into the air brake  130  arranged in an upper portion of the case brake  100 . The air brake  130  may prevent water from flowing backward to the case brake  100  from the sump  70 . The water flowing in the internal flow path  120  may have the highest potential energy at the top of the air brake  130 . The air brake  130  may include an air brake hole  130 a with a portion opened. The air brake hole  130   a  may be linked to the inner link  112   b  arranged to be adjacent to the air brake  130 . Accordingly, the air brake hole  130   a  may be linked to the outer link hole  112   a  and/or the tub link hole  113  through the air brake chamber  160  and the inner link  112   b . The air brake hole  130   a  may make the pressure in the case  110  and/or the internal flow path  120  maintain balance with atmospheric pressure. 
     The plurality of tubes  150  may allow water to flow into or out of the case brake  100 . The plurality of tubes  150  may be arranged at the bottom of the case  110 . The plurality of tubes  150  may include the inflow tube  151 , the outflow tube  152 , the sump drain connection tube  153 , and the drain hose connection tube  154 . 
     The inflow tube  151  may be provided so that the water that has flowed through the filter assembly  200  flows into the case brake  100 . The inflow tube  151  may extend down from the bottom of the case  110 . The inflow tube  151  may be connected to the filter assembly  200  through the first hose  151   a  to allow the water to flow into the case  110 . The water flowing in through the inflow tube  151  may pass the flowmeter  140 . The inflow tube  151  may be referred to as a first tube. 
     The outflow tube  152  may be arranged for the water that has passed the air brake  130  from the internal flow path  120  of the case brake  100  to flow into the sump  70 . The outflow tube  152  may extend down from the bottom of the case  110 . The outflow tube  152  may be connected to the sump  70  through the second hose  152   a  to allow the water to be supplied to the water collector  71  of the sump  70 . The outflow tube  152  may be referred to as a second tube. 
     The water discharged from the sump  70  may flow into the sump drain connection tube  153 . The sump drain connection tube  153  may extend down from the bottom of the case  110 . The sump drain connection tube  153  may be connected to the drain tube  73  of the sump  70  through a third hose  153   a  to allow the water to flow into the case  110  from the sump  70 . The sump drain connection tube  153  may be referred to as a third tube. 
     The drain hose connection tube  154  may allow the water that has flowed into the case  110  to drain out through the sump drain connection tube  153 . The drain hose connection tube  154  may extend down from the bottom of the case  110 . The drain hose connection tube  154  may be connected to the outside through a fourth hose  154   a . The drain hose connection tube  154  may be referred to as a fourth tube. 
       FIG.  9    is a perspective view of a filter assembly, according to an embodiment of the disclosure.  FIG.  10    is a perspective view illustrating the filter assembly shown in  FIG.  9    viewed from a different angle.  FIG.  11    is an exploded perspective view of a filter assembly, according to an embodiment. 
     Referring to  FIGS.  9 ,  10  and  11   , the dish washer  1  may include the filter assembly  200 . The filter assembly  200  may include a filter case  210 , the filter  220 , the case cover  230 , the flow path valve  250 , and a holder  260 . 
     The filter case  210  may be made up of a first case  211 , a second case  212 , and a third case  213 . The first case  211  may include the inflow tube  211   a , the first outlfow tube  211   b , a flow path forming part  211   c , a supporter  211   d , and a first valve coupler  211   e . The second case  212  may include the second outflow tube  212   b , a filter receiver  212   a , a flow path forming part  212   c , a receiver cover  212   d  and a second valve coupler  212   e . The third case  213  may include a filter receiver  213   a , a flow path cover  213   b , a receiver cover  213   c  and a coupler  213   d.    
     The filter case  210  may be placed underneath the tub  12 . For example, part of the filter case  210  may be arranged underneath the tub  12 , and the other part of the filter case  210  may go through the tub bottom  12   b  to be arranged in the washing chamber C. The user may separate the case cover  230  coupled to the filter case  210  to replace the filter  220  accommodated in the filter case  210 . 
     The filter case  210  may include the first case  211 , the second case  212 , and the third case  213 . An inner space  240  may be formed in the filter case  210 . In the first case  211 , the inflow tube  211   a , the first outflow tube  211   b , the flow path forming part  211   c , the supporter  211   d , and the first valve coupler  211   e  may be formed. 
     The inflow tube  211   a  may extend in an opposite direction of the Y direction. The inflow tube  211   a  may protrude from an outer surface of the first case  211  facing the sump  70 . The inflow tube  211   a  may be arranged to extend toward the sump  70 . The inflow tube  211   a  may extend to be connected to the water supply source  400 . 
     The first outflow tube  211   b  may extend in the Y direction. The first outflow tube  211   b  may protrude from an outer surface opposite the surface on which the inflow tube  211   a  is formed in the first case  211 . The filter assembly  200  may be arranged such that the first outflow tube  211   b  extends to an inner surface of the cabinet  11 . The flow path forming part  211   c  may form outer surfaces of the first case  211 . The flow path forming part  211   c  may be a portion in which a flow path is formed in the first case  211 . The supporter  211   d  may extend down from the bottom surface of the first case  211 . The supporter  211   d  may support the filter assembly  200  by contacting the lower frame  14  and/or the bottom plate  15 . It is not, however, limited thereto, and the supporter  211   d  may contact the ground to support the filter assembly  200 . 
     The first valve coupler  211   e  may be formed on one side of the first case  211  to be coupled to the first flow path valve  251 . The first valve coupler  211   e  may be formed in the opposite direction of the X direction on the first case  211 . When the first flow path valve  251  is coupled to the first valve coupler  211   e , the first flow path valve  251  may open the filtering flow path to allow the water brought into the filter case  210  to flow to the filter  220 . 
     The second case  212  may include the second outflow tube  212   b , the filter receiver  212   a , the flow path forming part  212   c , the receiver cover  212   d  and the second valve coupler  212   e . The second outflow tube  212   b  may extend in the direction of Y. The second outflow tube  212   b  may protrude from an outer surface of the second case  212 . The second outflow tube  212   b  may be positioned above the first outflow tube  211   b . The second outflow tube  212   b  may extend to the inner surface of the cabinet  11 . 
     The filter receiver  212   a  of the second case  212  may be opened to receive the filter  220  in the second case  212 . Part of the filter  220  may be received in the filter receiver  212   a . The flow path forming part  212   c  may form at least a portion of the outer surfaces of the second case  212 . The flow path forming part  212   c  may be a portion in which a flow path is formed in the second case  212 . The receiver cover  212   d  may form at least a portion of the outer surfaces of the second case  212 . The receiver cover  212   d  may form the filter receiver  212   a.    
     The second valve coupler  212   e  may be formed on one side of the second case  212  to be coupled to the second flow path valve  252 . The second valve coupler  212   e  may be formed in the direction of -X on the second case  212 . When the second flow path valve  252  is coupled to the second valve coupler  212   e , the second flow path valve  252  may open the bypass flow path to allow the water brought into the filter case  210  to bypass the filter  220 . 
     Furthermore, a fixer  214  may be arranged on one side of the second case  212 . The fixer  214  may be fixed to the lower frame  14  such that the filter case  210  is fixed in the dish washer. The fixer  214  may include a first fixer  214   a  and a second fixer  214   b  (See  FIG.  12   ). 
     The filter receiver  213   a  of the third case  213  may be opened to receive the filter  220  in the third case  213 . Part of the filter  220  may be received in the filter receiver  213   a . The flow path cover  213   b  may form at least a portion of the top surface of the third case  213 . The flow path cover  213   b  may cover the filtering flow path and/or the bypass flow path in the filter case  210 . The receiver cover  213   c  may form at least a portion of the outer surfaces of the third case  213 . The receiver cover  213   c  may form the filter receiver  213   a.    
     The coupler  213   d  of the third case  213  may be detachably coupled to the case cover  230 . The coupler  213   d  may be formed at the top of the third case  213 . The coupler  213   d  and the case cover  230  may be rotationally coupled. For example, the case cover  230  may be rotated in one direction to be decoupled from or coupled to the coupler  213   d.    
     The filter  220  may be arranged in the filter case  210  to filter the water brought into the filter case  210 . The filter  220  may be arranged in a flow path in the filter case  210 . For example, the filter  220  may be arranged in the filtering flow path. A flow path that does not pass the filter  220  in the filter case  210  may correspond to the bypass flow path. 
     The flow path valve  250  may be provided to open or close the filtering flow path and/or the bypass flow path. The flow path valve  250  may include various types of valves. For example, the flow path valve  250  may include a solenoid valve. However, the type of the flow path valve  250  is not limited thereto. The flow path valve  250  may include the first flow path valve  251  and the second flow path valve  252 . 
     The first flow path valve  251  and the second flow path valve  252  may be selectively operated under the control of the controller  500 . When the filtering flow path is required to be opened, the bypass flow path may be closed, and when the bypass flow path is required to be opened, the filtering flow path may be closed. In other words, when the first flow path valve  251  is opened, the second flow path valve  252  may be closed. When the second flow path valve  252  is opened, the first flow path valve  251  may be closed. 
     The first flow path valve  251  may be coupled to a side of the first case  211 . The first flow path valve  251  may be coupled to the first valve coupler  211   e  formed on the first case  211 . The first flow path valve  251  may open or close the filtering flow path. When the first flow path valve  251  opens the filtering flow path, the water in the filter case  210  may flow to the case brake  100  after being filtered through the filter  220 . 
     The second flow path valve  252  may be coupled to a side of the second case  212 . The second flow path valve  252  may be coupled to the second valve coupler  212   e  formed on the second case  212 . The second flow path valve  252  may open or close the bypass flow path. When the second flow path valve  252  opens the bypass flow path, the water in the filter case  210  may bypass the filter  220  and flow to the case brake  100 . 
     The holder  260  may fix the filter assembly  200  to the tub bottom  12   b  when a portion of the filter case  210  protrudes into the tub  12 , and may seal space between the tub bottom  12   b  and the case cover  230 . The holder  260  may be coupled to the filter case  210 . For example, the holder  260  may be coupled to the third case  213 . The holder  260  may cover the circumference of the third case  213 . The holder  260  may include a first holder  261  and a second holder  262 . 
       FIG.  12    is a cross-sectional view of the dish washer of  FIG.  3    cut along A-A′. 
     Referring to  FIG.  12   , the filter assembly  200  of the dish washer  1  may include the filter  220  to be received in the second case  212  and the third case  213 . The filter  220  may be arranged in the filter receiver  212   a  of the second case  212  and the filter receiver  213   a  of the third case  213 . The filter  220  may include a filter part  221  and a cavity  222 . The filter part  221  may filter the water brought into the filter case  210 . The cavity  222  may be formed in a center portion of the filter  220 . 
     The filter assembly  200  may include the case cover  230  for covering the top of the filter  220  and/or the filter case  210 . The case cover  230  may include a cover part  231 , an inserting projection  232 , a fixing projection  233 , and an interfering rib  234 . The cover part  231  may cover the top of the filter  220  and/or the filter case  210 . The cover part  231  may include a first cover part  231   a  and a second cover part  231   b . The first cover part  231   a  may be arranged around the second cover part  231   b . The inserting projection  232  may be inserted to the cavity  222 . The inserting projection  232  may extend down from the cover part  231 . The inserting projection  232  may have the filter  220  fixed in the filter case  210 . A hole  232 a may be formed at the inserting projection  232 . 
     The fixing projection  233  is inserted to the filter part  221  so that the filter  220  may be fixed in the filter case  210 . The fixing projection  233  may extend down from the cover part  231 . The fixing projection  233  may be provided in the plural. When the user attempts to detach the case cover  230  from the filter case  210  to draw out the filter  220  from within the receivers  212   a  and  213   a , the filter  220  may be detached and/or separated from the filter case  210  along with the case cover  230  while caught in the fixing projection  233 . Hence, the user is able to draw out the filter  220  from within the filter case  210  even without taking out the filter  220  with his/her hand, so the convenience increases. 
     The interfering rib  234  may interfere with the coupler  213   d  of the third case  213 . The interfering rib  234  may prevent separation of the filter case  210  and the case cover  230  once the filter case  210  and the case cover  230  are coupled. The interfering rib  234  may be formed to match the coupler  213   d  of the third case  213 . The interfering rib  234  may be provided in the plural. 
     The second case  212  may include a seat  212   h  and a settling projection  212   i . The filter  220  may be settled in the second case  212 . The filter  220  may be safely seated on the seat  212   h  of the second case  212 . The seat  212   h  may protrude upward from the bottom of the second case  212 . The settling projection  212   i  may be inserted to the inside of the filter part  221 . The settling projection  212   i  may also protrude upward from the bottom of the second case  212 . 
     A flow path link hole  247  may be formed at the bottom of the second case  212 . The flow path link hole  247  may allow the water having passed the filter  220  along the filtering flow path to flow into a fifth flow path  245 . The flow path link hole  247  may be connected to the fifth flow path  245 . The flow path link hole  247  may be formed in a position corresponding to the cavity  222  in the vertical direction. The second fixer  214   b  may be arranged on one side of the second case  212 . The second fixer  214   b  may have a bending shape. The second fixer  214 b may make the filter case  210  fixed to the lower frame  14 . 
     The filter assembly  200  may include the holder  260 . The holder  260  may be coupled to the third case  213 . The holder  260  may cover the circumference of the third case  213 . The holder  260  may be provided in the plural. The plurality of holders  260  may include the first holder  261  and the second holder  262 . 
     When the filter case  210  is coupled to the tub bottom  12   b , the first holder  261  may be placed above the tub bottom  12   b  and the second holder  262  may be placed below the tub bottom  12   b . The first holder  261  may be coupled to the third case  213  through a screw thread  213   e  of the third case  213 . The first holder  261  may fix the filter assembly  200  to the tub bottom  12   b  when a portion of the filter case  210  protrudes into the tub  12 , and may seal space between the tub bottom  12   b  and the case cover  230 . The second holder  262  may be placed above a surface  213   f  of the third case  213  to be supported by the surface  213   f  of the third case  213 . 
       FIG.  13    illustrates a filtering flow path as an example of a flow path formed by a filter assembly. 
     Referring to  FIG.  13   , as the first flow path valve  251  is opened, the filtering flow path is opened and the water brought into the filter case  210  may be filtered. The filtering flow path may be formed by an inlet  240   a , a first flow path  241 , a third flow path  243 , a fourth flow path  244 , a fifth flow path  245  and the first outlet  240   b . When the first flow path valve  251  is opened, the second flow path valve  252  may be closed to close the bypass flow path. 
     Water supplied from the water supply source  400  may flow into the filter assembly  200  through the inflow tube  211   a . The water having passed the inflow tube  211   a  may flow into the first flow path  241  through the inlet  240   a . The water brought into the first flow path  241  may flow into a flow path in the first flow path valve  251  and then flow out of the first flow path valve  251 . The water having passed the first flow path valve  251  may flow through a hole  211   f  formed at a flow path forming wall  211   g  into the third flow path  243  that extends in the direction of X. The water that has passed the third flow path  243  may flow up into the fourth flow path  244  formed in the second case  212 . The water that has passed the fourth flow path  244  may flow to the filter  220 . The water flowing to the filter  220  may be filtered and may flow down. 
     The water that has passed through the filter  220  may flow into the fifth flow path  245  formed in the first case  211 . For example, the water that has passed the fourth flow path  244  may flow to the cavity  222  after passing through the filter part  221 , and pass the flow path link hole  247  through the cavity  222 . The water having passed the flow path link hole  247  may head toward the fifth flow path  245 . The water flowing in the fifth flow path  245  may flow into the case brake  100  through the first outlet  240 b and the first outflow tube  211   b.    
       FIG.  14    illustrates a bypass flow path as an example of another flow path formed by a filter assembly. 
     Referring to  FIG.  14   , as the second flow path valve  252  is opened, the water brought into the filter case  210  may flow in the bypass flow path and bypass the filter  220 . That is, the water may not be purified but may flow directly to the case brake  100 . The bypass flow path may be formed by the inlet  240   a , the first flow path  241 , the second flow path  242  and the second outlet  240   c . When the second flow path valve  252  is opened, the first flow path valve  251  is closed, leading to blockage of the filtering flow path. 
     Water supplied from the water supply source  400  may flow into the filter assembly  200  through the inflow tube  211   a . The water having passed the inflow tube  211   a  may flow into the first flow path  241  through the inlet  240   a . The water brought into the first flow path  241  may flow into the second flow path  242  formed in the second case  212 . The water brought into the second flow path  242  may flow into a flow path in the second flow path valve  252  and then flow out of the second flow path valve  252 . The water having passed the second flow path valve  252  may flow through a hole  212   f  formed at the flow path forming wall  212   g  into a sixth flow path  246 . The sixth flow path  246  may be connected to the second outlet  240   c , and water may flow into the case brake  100  through the second outflow tube  212   b . When the first flow path valve  251  closes the filtering flow path and the second flow path valve  252  opens the bypass flow path, the water brought into the filter case  210  may not pass through the filter  220  but may flow directly into the case brake  100 . 
       FIG.  15    is a control block diagram of a dish washer, according to an embodiment. 
     Referring to  FIG.  15   , the dish washer  1  may include the controller  500 . The controller  500  may be electrically connected to the flowmeter  140 , the flow path valve  250 , the use interface  310 , the water leak sensor  320 , and a communication interface  330  and control each of the flowmeter  140 , the flow path valve  250 , the use interface  310 , the water leak sensor  320 , and the communication interface  330 . The controller  500  may include a memory  510  and a processor  520 . 
     The controller  500  may be arranged in the main body  10 , and the user interface  310  may be arranged on the door  20 . The water leak sensor  320  may be placed on the bottom plate  15  in the machine room L. The controller  500 , the user interface  310  and the water leak sensor  320  are not limited to the positions in the above example but may be placed in various positions. 
     The memory  510  may memorize/store various information required for operation of the dish washer  1 . The memory  510  may store instructions, an application, data and/or a program required for operation of the dish washer  1 . The memory  510  may include a volatile memory for temporarily storing data, such as a static random access memory (SRAM), or a dynamic random access memory (DRAM). The memory  510  may also include a non-volatile memory for storing data for a long time, such as a read-only memory (ROM), an erasable programmable ROM (EPROM), or an electrically erasable programmable ROM (EEPROM). 
     The processor  520  may generate control signals for controlling operation of the dish washer  1  based on the instructions, application, data and/or program stored in the memory  510 . The processor  520  may include logic circuits and operation circuits in hardware. The processor  520  may process data according to the program and/or instructions provided from the memory  510  and generate a control signal based on the processing result. The memory  510  and the processor  520  may be implemented in one control circuit or in multiple circuits. 
     The user interface  310  may include a display  311  and an input module  312 . The display  311  may display information regarding a state and/or operation of the dish washer  1 . The display  311  may display information input by the user or information to be provided for the user in various screens. The display  311  may display information regarding an operation of the dish washer  1  in at least one of an image or text. Furthermore, the display  311  may display a graphic user interface (GUI) that enables the dish washer  1  to be controlled. Hence, the display  311  may display a user interface element (UI element) such as an icon. 
     The display  311  may include a display panel of various types. For example, the display device  311  may include a liquid crystal display (LCD) panel, a light emitting diode (LED) panel, an organic LED (OLED) panel, or a micro LED panel. Furthermore, the display  311  may be implemented with a touch display. 
     The input module  312  may output an electric signal (voltage or current) corresponding to a user input to the processor  520 . The input module  312  may include various buttons and even a dial. When the display  311  is provided as a touch display, the input module  312  may not be provided separately. For example, the user interface  310  may obtain various user inputs such as a user input to turn on or off the dish washer  1  and a user input to select a washing course. 
     The communication interface  330  may include a wired communication module and/or a wireless communication module to communicate with an external device (e.g., a mobile device, a computer). The wired communication module may communicate with an external device over a wide area network such as the Internet, and the wireless communication module may communicate with an external device through an access point connected to a wide area network. With this, the user may remotely control the dish washer  1 . 
     A plurality of washing courses for operation of the dish washer  1  may be provided. For example, various washing courses such as an automatic course, a standard course, a power course, a fast course and/or a rinsing/drying course may be provided. The number and/or types of processes included in each washing course may be different. The user may use the user interface  310  to select a washing course. 
     The washing course may include at least one process. When at least one process is performed, water may be sprayed to dishes placed in the dish washer  1 . For example, the standard course may include a preliminary washing process, a main washing process, a rinsing process and a drying process. The preliminary washing process, the main washing process, the rinsing process and the drying process may be sequentially performed. Types of the processes are not limited to the above example. 
     When a process in which to spray water is performed, water may be supplied to the sump  70  through the water supply source  400 , the filer assembly  200 , and the case brake  100 . For example, in a rinsing process, the water brought into the filter assembly  20  from the water supply source  400  may pass through the filter  220  or bypass the filter  220  and move to the case brake  100 . 
     The processor  520  may control the flow path valve  250  and the water supply valve  410 . The water supply valve  410  may be connected and coupled to the water supply source  400 . The processor  520  may control the water supply valve  410  to allow or block inflow of water to the dish washer  1  from the water supply source  400 . Furthermore, the processor  520  may control the flow path valve  250  to open or close a flow path formed between the water supply valve  410  and the case brake  100  to lead the water to the case brake  100 . 
     The flow path valve  250  may be a solenoid valve. The solenoid valve may open or close a flow path by moving a plunger connected to a piston. However, when a water pressure is applied to a spring and the plunger of the solenoid valve while the solenoid valve is closed or opened, the spring and the plunger of the solenoid valve may not move due to the water pressure. 
     As there is no other structure that hinders water flows between the water supply valve  410  and the flow path valve  250 , when the water supply valve  410  is opened, the water quickly reaches the flow path valve  250  through the inflow tube  211   a  of the filter assembly  200 . However, when the water reaches the flow path valve  250  while the flow path valve  250  is closed, the water pressure may hinder the flow path valve  250  from being opened. On the contrary, while the flow path valve  250  is opened, the water applies pressure to the flow path valve  250  while passing the flow path valve  250 . When there is an attempt to close the flow path valve  250  while the water pressure is applied to the flow path valve  250 , the water pressure may hinder the flow path valve  250  from being closed. 
     In the traditional dish washer, the flow path valve and the filter are arranged after the case brake to prevent the water pressure from putting the brakes on the valve. In other words, in the traditional dish washer, water supplied from the water supply source passes the case brake first and then flows to the flow path valve and the filter. In the traditional dish washer, a plurality of valves are not arranged successively because of the braking problem of the valves. 
     To solve these problems, the processor  520  may control the water supply valve  410  and the flow path valve  250  at different points in time at the start or stop of water supply. The processor  520  may control the water supply valve  410  and the flow path valve  250  at different points in time at the start of water supply. The processor  520  may control the water supply valve  410  and the flow path valve  250  at different points in time at the stop of water supply. Specifically, to supply water, the flow path valve  250  and the water supply valve  410  may be sequentially opened, and to stop supplying water, the water supply valve  410  and the flow path valve  250  may be sequentially closed. 
     In other words, at the start of supplying water, the flow path valve  250  may be opened first and then the water supply valve  410  may be opened. Opening the flow path valve  250  earlier than the water supply valve  410  to supply water may prevent water pressure from being applied to the flow path valve  250 . Accordingly, the flow path valve  250  may be easily opened without hindrance of water pressure. To stop supplying water, the water supply valve  410  may be closed first and then the flow path valve  250  may be closed. Closing the water supply valve  410  earlier to stop supplying water may prevent water pressure from being applied to the flow path valve  250 . Accordingly, the flow path valve  250  may be easily closed. 
     The processor  520  may determine operation of the water supply valve  410  and operation of one of the plurality of flow path valves  250 , based on at least one process included in a washing course. The processor  520  may determine opening of the bypass flow path or opening of the filtering flow path based on at least one process included in a washing course. 
     When water supply into the dish washer  1  is not required, both the bypass flow path and the filtering flow path may remain closed. In other words, in a case that water supply into the dish washer  1  is not required, both the first flow path valve  251  and the second flow path valve  252  may be kept closed. Based on at least one process included in a washing course, the processor  520  may selectively open the first flow path valve  251  and the second flow path valve  252  when water supply is required. 
     The processor  520  may open one of the first flow path valve  251  and the second flow path valve  252  and close the other one to open the filtering flow path or the bypass flow path. When the filtering flow path is opened, the bypass flow path may be closed, and when the bypass flow path is opened, the filtering flow path may be closed. 
     When the filtering flow path is required to be opened to supply water to the filter  220 , the processor  520  may open the first flow path valve  251  first and then open the water supply valve  410 . When the filtering flow path is required to be closed to stop supplying water, the processor  520  may close the water supply valve  410  first and then close the first flow path valve  251 . 
     When the bypass flow path that bypasses the filter  220  is required to be opened, the processor  520  may open the second flow path valve  252  first and then open the water supply valve  410 . When the bypass flow path is required to be closed to stop supplying water, the processor  520  may close the water supply valve  410  first and then close the second flow path valve  252 . 
     For example, the processor  520  may control the flow path valve  250  for the water purified by the filter  220  to flow to the sump  70  to enter at least one rinsing process. Especially, the processor  520  may open the first flow path valve  251  and close the second flow path valve  252  to open the filtering flow path to enter the last rinsing process. As the filtered water is used only for a predetermined process (e.g., the last rinsing course), a period of use of the filter  220  may increase. With the increasing period of use of the filter  220 , maintenance costs of the dish washer  1  may be reduced. 
     However, a process that uses the filtering flow path may vary depending on a design. It is also possible to allow passage through the filter  220  only in the first rinsing course. It is also possible to allow the water to pass through the filter  220  or not to pass through the filter  220  in all processes required to spray water into the tub  12 . 
     Furthermore, the processor  520  may control the first flow path valve  251  and/or the second flow path valve  252  to open the filtering flow path or the bypass flow path based on a user input obtained through the user interface  310 . The user may manipulate the user interface  310  to set a purification function or release the purification function. When the purification function is set, the first flow path valve  251  may be opened to open the filtering flow path to supply water, and the second flow path valve  252  may be closed to close the bypass flow path. 
     The user may select whether to use purified water in each process of the dish washer  1  (i.e., whether to use the purification function). For example, the processor  520  may set to use the purified water in the last rinsing process and set to use non-purified water in the other processes based on a user input. As the user is able to select whether to use the purified water when the dish washer  1  is operated, convenience of the user may increase. 
     The water leak sensor  320  may detect water leaking out from the filter assembly  200 . The water leak sensor  320  may be arranged on the bottom plate  15  to be able to detect a water leak from the filter assembly  200 , and may send the water leak information to the controller  500 . The controller  500  may control the user interface  300  to provide a notification of a water leak from the filter assembly  200  (e.g., a water leak warning) based on the water leak information sent from the water leak sensor  320 . 
     Furthermore, the processor  520  may determine whether to provide a notification of filter replacement based on at least one of a number of times of opening the first flow path valve  251 , opening hours of the first flow path valve  251  or a period elapsed after installation of the filter  220 . Moreover, the processor  520  may determine whether to provide the notification of filter replacement based on an amount of accumulated water having passed through the filter  220  and flowing into the case brake  100 . The amount of the water flowing into the case brake  100  may be measured by the flowmeter  140 . 
     The processor  520  may accumulate the number of times of opening the first flow path valve  251 , and control the user interface  310  to provide a notification of filter replacement based on the accumulated number of times of opening the first flow path valve  251  being a preset limited number (e.g.,  380 ). When the first flow path valve  251  is opened, the filtering flow path is opened and water flows into the filter  220 , so the opening of the first flow path valve  251  may imply that the filter  220  is used. For example, when the accumulated number of times of opening the first flow path valve  251  reaches  380 , the processor  520  may determine that the filter  220  needs to be replaced and may control the user interface  310  to indicate a notification of filter replacement. 
     The processor  520  may determine hours of use of the filter  220  by accumulating opening hours of the first flow path valve  251 , and control the user interface  310  to provide a notification of filter replacement based on the hours of use of the filter  220  being preset limited hours (e.g., 5,000 hours). The opening hours of the first flow path valve  251  may refer to actual hours for which the filter  220  has been used, i.e., hours for which purification has been performed. For example, when the hours of use of the filter  220  reaches 5,000 hours, the processor  520  may determine that the filter  220  needs to be replaced and may control the user interface  310  to indicate a notification of filter replacement. The opening hours of the first flow path valve  251  may be equal to hours for which a process requiring to use the filtering flow path is performed. 
     The processor  520  may control the user interface  310  to provide a notification of filter replacement based on a period elapsed after installation of the filter  220  corresponding to a recommended period for replacement (e.g., one year). When the filter  220  has not been often used but the time has long passed after the filter  220  was installed in the dish washer  1 , performance of the filter  220  may be degraded and the filter  220  may have been contaminated. Hence, providing the notification of filter replacement when the recommended period for replacement has elapsed after installation of the filter  220  may lead to hygienic use of the dish washer  1 . 
     The processor  520  may calculate an accumulated amount of water having passed through the filter  220  and flowing into the case brake  100  after the first flow path valve  251  is opened, and determine whether to provide a notification of filter replacement based on the accumulated amount of water calculated. For example, when the accumulated amount of water having passed through the filter  220  and flowing into the case brake  100  reaches a limited amount of water (e.g., 5,000 litters), the processor  520  may control the user interface  310  to provide a notification of filter replacement. The processor  520  may determine a value measured by the flowmeter  140  after the first flow path valve  251  is opened as an amount of water having passed through the filter  220 . 
     When one or more of the number of times of opening the first flow path valve  251 , hours of use of the filter  220 , a period elapsed after installation of the filter  220  and an amount of water having passed through the filter  220  reach a limited value, the processor  520  may control the user interface  310  to display a notification of filter replacement. 
     Furthermore, the processor  520  may control the flow path valve  250  and the water supply valve  410  to stop supplying water until the filter  220  is replaced after the notification of filter replacement is provided. 
       FIG.  16    is a time sequence chart illustrating control timing of a water supply valve and a valve of a filter assembly. 
     Referring to  FIG.  16   , the processor  520  of the dish washer  1  may determine to start or stop supplying water based on at least one process included in a washing course. For example, a program and/or software for a rinsing process may include an instruction to start supplying water and an instruction to stop supplying water. The processor  520  may open the flow path valve  250  at time t 1 , and after n seconds (e.g., 1 second) elapses, open the water supply valve  410  at time t 2 . Depending on whether to use purified water, the first flow path valve  251  or the second flow path valve  252  may be opened at time t 1 . 
     The water supply valve  410  may remain opened until time t 3  at which the instruction to stop supplying water is placed. The flow path valve  250  may remain opened until time t 4  after n seconds (e.g., 1 second) elapses from time t 3 . The processor  520  may close the water supply valve  410  at time t 3  based on the instruction to stop supplying water, and close the flow path valve  250  at time t 4 . When the first flow path valve  251  is opened at time t 1 , the first flow path valve  251  may be closed at time t 4 . Alternatively, when the second flow path valve  252  is opened at time t 1 , the second flow path valve  252  may be closed at time t 4 . 
     In this way, by sequentially controlling the flow path valve  250  and the water supply valve  410  to start or stop supplying water, a situation in which the flow path valve  250  is not operated due to water pressure may be prevented. 
       FIG.  17    is a flowchart illustrating a method of controlling a valve of a dish washer, according to an embodiment.  FIG.  18    is a flow chart illustrating a method of controlling the dish washer described in  FIG.  17    in more detail. 
     Referring to  FIG.  17   , the processor  520  of the dish washer  1  may determine whether to start supplying water based on at least one process (e.g., a rinsing process) included in a washing course, in operation  1701 . A program and/or software for performing a process may include an instruction to start supplying water and an instruction to stop supplying water. 
     Furthermore, the processor  520  may determine to operate one of the plurality of flow path valves  250  included in the filter assembly  200  to supply water into the dish washer  1 . In other words, the processor  520  may determine to open the first flow path valve  251  or open the second flow path valve  252  when water supply is required. 
     The processor  520  may open the flow path valve  250  first to start supplying water, in operation  1702 . The processor  520  may open the water supply valve  410  based on the passage of a preset time after the flow path valve  250  is opened, in operation  1703 . As both the flow path valve  250  and the water supply valve  410  are opened, water may flow to the filter assembly  200  from the water supply source  400 . Opening the flow path valve  250  earlier than the water supply valve  410  to start supplying water may prevent water pressure from being applied before the flow path valve  250  is opened. 
     The processor  520  may determine to stop supplying water based on completion of a process (e.g., a rinsing process), in operation  1704 . The processor  520  may determine that the process has been completed when a preset period of time for which the process is performed has elapsed. The processor  520  may read out and deal with the instruction to stop supplying water at a time of completion of the process. The processor  520  may close the water supply valve  410  first to stop supplying water, in operation  1705 . The processor  520  may close the water supply valve  250  based on the passage of a preset time after the water supply valve  410  is closed, in operation  1706 . By closing the water supply valve  410  first to stop supplying water, the water pressure that has been applied to the flow path valve  250  may be removed. Accordingly, the flow path valve  250  may be easily operated. 
     Referring to  FIG.  18   , the processor  250  may determine whether to open one of the filtering flow path and the bypass flow path based on at least one process included in a washing course, in operation  1801 . For example, the processor  520  may determine to open the filtering flow path in the last rinsing process. 
     The processor  520  may read out and deal with the instruction to start supplying water at a time to enter a process. The processor  520  may open the first flow path valve  251  to open the filtering flow path or open the second flow path valve  252  to open the bypass flow path based on the instruction to start supplying water, in operation  1802  and operation  1803 . The processor  520  may open one of the first flow path valve  251  and the second flow path valve  252  and close the other one. For example, the first flow path valve  251  may be opened and the second flow path valve  252  may be closed to open the filtering flow path in the last rinsing process. 
     The process  520  may open the first flow path valve  251  or the second flow path valve  252  and then open the water supply valve  410 , in operation  1804 . In this way, opening the flow path valve  250  earlier than the water supply valve  410  to start supplying water may prevent water pressure from being applied to the flow path valve  250  before the flow path valve  250  is opened. 
     The processor  520  may determine to stop supplying water based on completion of the process, in operation  1805 . The processor  520  may determine that the process has been completed when a preset period of time for which the process is performed has elapsed. The processor  520  may read out and deal with the instruction to stop supplying water at a time of completion of the process. The processor  520  may close the water supply valve  410  to stop supplying water in operation  1806 , and after this, close the first flow path valve  251  or the second flow path valve  252  in operation  1807 . By closing the water supply valve  410  first to stop supplying water, the water pressure that has been applied to the flow path valve  250  may be removed. Accordingly, the flow path valve  250  may be easily operated. 
       FIG.  19    is a flowchart illustrating a method of providing a notification of filter replacement of a dish washer, according to an embodiment. 
     Referring to  FIG.  19   , when the dish washer is started to be operated in operation  1901 , the processor  520  of the dish washer  1  may determine the number of times of opening the first flow path valve  251  to open or close the filtering flow path in operation  1902 . The processor  520  may control the user interface  310  to provide a notification of filter replacement based on the accumulated number of times of opening the first flow path valve  251  being a preset limited number (e.g.,  380 ), in operation  1903  and operation  1907 . When the first flow path valve  251  is opened, the filtering flow path is opened and water flows into the filter  220 , so the opening of the first flow path valve  251  may imply that the filter  220  is used. For example, when the accumulated number of times of opening the first flow path valve  251  reaches  380 , the processor  520  may determine that the filter  220  needs to be replaced and may control the user interface  310  to indicate a notification of filter replacement. 
     When the number of times of opening the first flow path valve  251  is smaller than the preset limited number, the processor  520  may check opening hours of the first flow path valve  251 , in operation  1904 . The processor  520  may control the user interface  310  to provide a notification of filter replacement based on the opening hours of the first flow path valve  251  being preset limited hours (e.g., 5,000 hours), in operation  1905  and operation  1907 . The opening hours of the first flow path valve  251  may refer to actual hours for which the filter  220  has been used, i.e., hours for which purification has been performed. For example, when the hours of use of the filter  220  reaches 5,000 hours, the processor  520  may determine that the filter  220  needs to be replaced and may control the user interface  310  to indicate a notification of filter replacement. 
     When the opening hours of the first flow path valve  251  is smaller than the preset limited hours, the processor  520  may check a period elapsed after installation of the filter  220 . The processor  520  may control the user interface  310  to provide a notification of filter replacement based on the period elapsed after installation of the filter  220  corresponding to a recommended period for replacement (e.g., one year) in operation  1906  and operation  1907 . 
     The processor  520  may detect whether to replace the filter  220 , in  1908 . For example, based on detection of a user input pressing a reset button provided on the user interface  310 , the processor  520  may identify that filter  220  has been replaced. In another example, there may be an extra filter sensor (not shown) arranged to detect the filter  220 . 
     The processor  520  may reset the number of times of opening the first flow path valve  251 , the opening hours of the first flow path valve  251  (hours of use of the filter  220 ), and the period elapsed after installation of the filter  220  in response to replacement of the filter  220 . 
     Although it was described in  FIG.  19    that the number of times of opening the first flow path valve  251 , the opening hours of the first flow path valve  251  and the period elapsed after installation of the filter  220  are sequentially checked, the disclosure is not limited to the aforementioned sequence. In other words, the number of times of opening the first flow path valve  251 , the opening hours of the first flow path valve  251  and the period elapsed after installation of the filter  220  may be separately checked regardless of the sequence. 
     Furthermore, when the accumulated amount of water having passed through the filter  220  and flowing into the case brake  100  reaches a limited amount of water (e.g., 5,000 litters), the processor  520  may control the user interface  310  to provide a notification of filter replacement. 
     When one or more of the number of times of opening the first flow path valve  251 , hours of use of the filter  220 , a period elapsed after installation of the filter  220  and an amount of water having passed through the filter  220  reach a limited value, the processor  520  may control the user interface  310  to display a notification of filter replacement. 
     A dish washer and method for controlling the same as disclosed herein may increase the lifespan of a filter by forcing water supplied from a water supply source to bypass the filter and flow to a case brake or to pass through the filter and flow to the case brake. 
     The dish washer and method for controlling the same as disclosed herein may prevent blockage of a flow path, in which water flows, by sequentially controlling a water supply valve connected to the water supply source and a valve installed in a filter assembly. 
     Furthermore, the dish washer and method for controlling the same as described herein may determine the remaining lifespan of the filter and provide a notification of filter replacement. The notification of filter replacement may be provided at a proper time to induce the user to replace the filter, thereby increasing hygiene and facilitation of management of the dish washer. 
     The aforementioned methods according to the various embodiments of the disclosure may be provided in a computer program product. The computer program product may be a commercial product that may be traded between a seller and a buyer. The computer program product may be distributed in the form of a storage medium (e.g., a compact disc read only memory (CD-ROM)), through an application store (e.g., play store™), directly between two user devices (e.g., smart phones), or online (e.g., downloaded or uploaded). In the case of online distribution, at least part of the computer program product (e.g., a downloadable app) may be at least temporarily stored or arbitrarily created in a storage medium that may be readable to a device such as a server of the manufacturer, a server of the application store, or a relay server. 
     The embodiments of the disclosure have thus far been described with reference to accompanying drawings. It will be obvious to those of ordinary skill in the art that the disclosure may be practiced in other forms than the embodiments as described above without changing the technical idea or essential features of the disclosure. The above embodiments are only by way of example, and should not be construed in a limited sense. 
     The disclosure provides a dish washer and method for controlling the same, which enables water supplied from a water supply source to bypass a filter and flow into a case brake or to pass through the filter and flow into the case brake. 
     The disclosure provides a dish washer and method for controlling the same, capable of preventing blockage of a flow path, in which water moves, by controlling a water supply valve connected to the water supply source and a valve installed at a filter assembly. 
     The disclosure also provides a dish washer and method for controlling the same, capable of providing a notification of replacement of the filter. 
     A dish washer and method for controlling the same as disclosed herein may increase the lifespan of a filter by forcing water supplied from a water supply source to bypass the filter and flow to a case brake or to pass through the filter and flow to the case brake. 
     The dish washer and method for controlling the same as disclosed herein may prevent blockage of a flow path, in which water flows, by sequentially controlling a water supply valve connected to the water supply source and a valve installed in a filter assembly. 
     Furthermore, the dish washer and method for controlling the same as described herein may determine the remaining lifespan of the filter and provide a notification of filter replacement. The notification of filter replacement may be provided at a proper time to induce the user to replace the filter, thereby increasing hygiene and facilitation of management of the dish washer.