Patent Publication Number: US-11384472-B2

Title: Washing machine having detergent supply device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a U.S. National Stage Application which claims the benefit under 35 U.S.C. § 371 of International Patent Application No. PCT/KR2018/010265 filed on Sep. 4, 2018, which claims foreign priority benefit under 35 U.S.C. § 119 of Korean Patent Application No. 10-2017-0138284 filed on Oct. 24, 2017 in the Korean Intellectual Property Office, the contents of both of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     The disclosure relates to a washing machine, and more specifically, to a washing machine having a detergent supply device. 
     BACKGROUND ART 
     A washing machine is an appliance that washes clothes using electric power. In general, a washing machine includes a tub to store wash water, a drum rotatably mounted in the tub, a pulsator rotatably mounted on a bottom of the drum, and a motor to rotate the drum and the pulsator. 
     After laundry and detergent water are put in the drum, the drum and the pulsator are rotated by the motor, and the pulsator stirs the laundry placed in the drum together with the wash water to remove the dirt from the laundry. 
     In general, a detergent supply device of a drum washing machine includes a detergent case serving to accommodate a solid detergent and a liquid detergent and a water supply unit to supply water to the detergent case. 
     As for the detergent case into which a detergent is introduced, detergents may not be washed away depending on the water pressure of the corresponding place or the water temperature. In general, the detergent may not be washed away in a part having a slow flow rate of water or a part not easily reached by the supplied water. The residual detergent when continuously exposed to low temperature water may be hardened. The hardened detergent may not be washed away even when the water pressure is increased, which leads to the rinsing performance being lowered in a rinsing process following the washing process, or customer dissatisfaction after the rinsing process. 
     DISCLOSURE 
     Technical Problem 
     Therefore, it is an object of the disclosure to provide a washing machine having an improved structure for a detergent supply device in which water supplied to the detergent supply device is evenly distributed in a detergent case. 
     It is another object of the disclosure to provide a washing machine having an improved structure for a detergent supply device in which a one-direction rotational water current is generated inside a detergent case by water sprayed from a plurality of spray nozzles. 
     It is another object of the disclosure to provide a washing machine having an improved structure for a detergent supply device in which a detergent is prevented from remaining in a detergent case regardless of the water pressure or the water temperature. Additional aspects of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the disclosure. 
     According to an aspect of the present invention, there is provided a detergent supply device including: a housing having an opening; a detergent case coupled to be movable through the opening and provided with a detergent accommodating part in which a detergent is accommodated; and a water supply unit coupled to the housing to guide water to the detergent case, wherein the water supply unit includes: a first water supply frame provided with a first water supply channel that guides water to a first area corresponding to the detergent accommodating part; and a second water supply frame provided with a second water supply channel that guides water to a second area having at least a portion located outside a circumference of the first area. 
     The second water supply frame may be arranged below the first water supply frame. 
     The first water supply frame may include a plurality of spray nozzles arranged in the first area of the detergent case and configured to form a one-directional rotational water current by sprayed water. 
     The plurality of spray nozzles may protrude downward from the first water supply frame while having an inclination. 
     The detergent case may include a rotating member coupled to be rotatable to dissolve a detergent in the detergent accommodating part in water. 
     The plurality of spray nozzles may be arranged to form a rotational water current in a rotation direction of the rotating member. 
     The water supply frame may include a first supply pipe configured to supply water to the first water supply channel and a second supply pipe configured to supply water to the second water supply channel, wherein the first supply pipe and the second supply pipe alternately supply water. 
     The second water supply frame may include a plurality of water supply holes such that water flowing through the second water supply channel is sprayed to the second area. 
     A number of the water supply holes may be more than a number of the plurality of spray nozzles. 
     The first water supply frame may include a communication hole that allows the first water supply frame to communicate with the second water supply frame, and may include a second water supply channel forming rib connecting the second water supply pipe to the communication hole to guide water supplied through the communication hole to the second water supply channel. 
     The first water supply frame may include a first water supply forming rib that forms the first water supply channel. 
     According to another aspect of the present invention, there is provided a washing machine including: a main body; a drum rotatably provided inside the main body; and a detergent supply device provided in the main body and configured to supply a detergent into the drum, wherein the detergent supply device includes: a detergent case provided with a detergent accommodating part in which a detergent is accommodated; a rotating member rotatably mounted on the detergent accommodating part; and a water supply frame configured to supply water to the detergent accommodating part, wherein the water supply frame includes: a plurality of spray nozzles configured to form a one-direction rotational water current by water sprayed into the detergent accommodating part; and a plurality of water supply holes configured to guide water to correspond to an outer circumference of the detergent accommodating part. 
     The plurality of spray nozzles may protrude downward from the first water supply frame while having an inclination. 
     The plurality of spray nozzles may be arranged to form a rotational water current in a rotation direction of the rotating member. 
     The detergent supply device may include: a first supply pipe configured to supply water to a first area corresponding to the detergent accommodating part; and a second supply pipe configured to supply water to a second area corresponding to an outer circumference of the detergent accommodating part, wherein the first supply pipe and the second supply pipe alternately supply water. 
     A number of the water supply holes may be more than a number of the plurality of spray nozzles. 
     The water supply frame may include a first water supply frame configured to guide water to the first area and a second water supply frame arranged below the first water supply frame and configured to guide water to the second area. 
     The first water supply frame may include a first water supply channel forming rib connecting the first supply pipe to the plurality of spray nozzles to form the first water supply channel. 
     The first water supply frame may include a communication hole that allows the first water supply frame to communicate with the second water supply frame, and include a second water supply channel forming rib connecting the second water supply pipe to the communication hole to guide water supplied through the communication hole to the second water supply channel. 
     The water supply device may include a cover coupled to an upper portion of the first water supply frame. 
     Advantageous Effects 
     As is apparent from the above, the water supplied to the detergent supply device is evenly distributed in the detergent case, so that the detergent in the detergent case can be washed out completely. 
     In addition, the detergent can be prevented from remaining irrespective of the water pressure or the water temperature, thereby eliminating the consumer&#39;s concern about the residual detergent. 
     In addition, the water sprayed from the plurality of spray nozzles generates a one-direction rotational water current in the detergent case, and the water is evenly scattered throughout the detergent case, so that the detergent case is maintained to be clean. 
    
    
     
       DESCRIPTION OF DRAWINGS 
       These and/or other aspects of the invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which: 
         FIG. 1  is a view illustrating the configuration of a washing machine equipped with a detergent supply device according to an embodiment of the disclosure; 
         FIG. 2  is an exploded perspective view illustrating a detergent supply device according to an embodiment of the disclosure; 
         FIG. 3  is an exploded perspective view illustrating the detergent supply device of  FIG. 2 , which is viewed at another angle; 
         FIG. 4  is a perspective view illustrating a detergent case of a detergent supply device according to an embodiment of the disclosure; 
         FIG. 5  is a plan view illustrating a detergent case according to an embodiment of the disclosure; 
         FIG. 6  is an exploded perspective view illustrating a water supply unit of a detergent supply device according to an embodiment of the disclosure; 
         FIG. 7  is a view illustrating a first water supply frame and a second water supply frame according to an embodiment of the disclosure, which is viewed at different angles; 
         FIG. 8  is a view illustrating a first water supply channel and a second water supply channel of a water supply unit according to an embodiment of the disclosure; 
         FIG. 9  is a bottom view illustrating a first water supply frame and a second water supply frame according to an embodiment of the disclosure; 
         FIG. 10  is a cross-sectional view taken along line A-A of  FIG. 6 , which shows a first water supply frame according to an embodiment of the disclosure; 
         FIG. 11  is an enlarged view of portion C of  FIG. 10 , which shows a spray nozzle according to an embodiment of the disclosure; and 
         FIG. 12  is a cross-sectional view taken along line B-B of  FIG. 6 , which shows a second water supply frame according to an embodiment of the disclosure. 
     
    
    
     MODES OF THE INVENTION 
     Hereinafter, embodiment of the disclosure will be described with reference to the accompanying drawings. The terms “front”, “rear”, “upper”, “lower”, “top”, and “bottom” as herein used are defined with respect to the drawings, but the terms may not restrict the shape and position of the respective components. 
       FIG. 1  is a view illustrating the configuration of a washing machine  1  equipped with a detergent supply device according to an embodiment of the disclosure. 
     Referring to  FIG. 1 , the washing machine  1  includes a main body  10  defining the external appearance thereof and supporting various components therein, a tub  20  arranged in the main body  10 , a drum  30  rotatably arranged in the tub  20 , and a motor  40  to drive the drum  30 . 
     The main body  10  is formed with an entrance hole  11  at a front surface thereof, through which laundry is introduced into the drum  30 . The entrance hole  11  may be opened or closed by a door  12  mounted on the front surface of the main body  10 . 
     A water supply pipe  50  to supply wash water to the tub  20  is mounted above the tub  20 . The water supply pipe  50  has one side connected to an external water supply source (not shown) and the other side connected to a detergent supply device  100 . 
     The detergent supply device  100  is connected to the tub  20  through a connection pipe  54 . The detergent supply device  100  includes a detergent case  120  to accommodate a detergent or a fabric softener. Water supplied through the water supply pipe  50  passes through the detergent case  120  and is mixed with the detergent or the fabric softener so that the water together with the detergent or the fabric softener is supplied into the tub  20 . 
     A water drain pump  60  and a water drain pipe  62  may be installed below the tub  220  to discharge water inside the tub  20  to the outside of the main body  10 . 
     The drum  30  includes a cylindrical body  31 , a front plate  32  placed at the front side of the cylindrical body  31 , and a rear plate  33  placed at the rear side of the cylindrical body  31 . The front plate  32  has an aperture  32   a  for entrance of laundry, and the rear plate  33  may be connected to a drive shaft  42  to transmit the power of the motor  40 . 
     A plurality of through-holes  34  are formed in the circumference of the drum  30 . A plurality of lifters  35  are provided at an inner circumferential surface of the drum  30  to raise and drop laundry during rotation of the drum  30 . 
     The drive shaft  42  is arranged between the drum  30  and the motor  40 . One end of the drive shaft  42  is connected to the rear plate  33 , and the other end of the drive shaft  42  extends outward of a rear wall of the tub  20 . When the motor  40  rotates the drive shaft  42 , the drum  30  connected to the drive shaft  42  is rotated about the drive shaft  42 . 
     A bearing housing  70  is mounted to the rear wall of the tub  20  to rotatably support the drive shaft  42 . The bearing housing  70  may be inserted into the rear wall of the tub  20  during injection molding of the tub  20 . Bearings  72  are interposed between the bearing housing  70  and the drive shaft  42 , to assure smooth rotation of the drive shaft  42 . 
     Hereinafter, the structure of the detergent supply device  100  according to the embodiment of the disclosure will be described. 
       FIG. 2  is an exploded perspective view illustrating a detergent supply device according to an embodiment of the disclosure,  FIG. 3  is an exploded perspective view illustrating the detergent supply device of  FIG. 2 , which is viewed at another angle,  FIG. 4  is a perspective view illustrating a detergent case of a detergent supply device according to an embodiment of the disclosure,  FIG. 5  is a plan view illustrating a detergent case according to an embodiment of the disclosure,  FIG. 6  is an exploded perspective view illustrating a water supply unit of a detergent supply device according to an embodiment of the disclosure,  FIG. 7  is a view illustrating a first water supply frame and a second water supply frame according to an embodiment of the disclosure, which is viewed at different angles,  FIG. 8  is a view illustrating a first water supply channel and a second water supply channel of a water supply unit according to an embodiment of the disclosure,  FIG. 9  is a bottom view illustrating a first water supply frame and a second water supply frame according to an embodiment of the disclosure,  FIG. 10  is a cross-sectional view taken along line A-A′ of  FIG. 6 , which shows a first water supply frame according to an embodiment of the disclosure,  FIG. 11  is an enlarged view of portion C of  FIG. 10 , which shows a spray nozzle according to an embodiment of the disclosure, and  FIG. 12  is a cross-sectional view taken along line B-B′ of  FIG. 6 , which shows a second water supply frame according to an embodiment of the disclosure. 
     Referring to  FIGS. 2 to 12 , the detergent supply device  100  includes the detergent supply device  110 , a detergent case  120  movably coupled to the housing  110  and accommodating a detergent and a fabric softener, a water supply unit  200  coupled to the upper portion of the housing  110  to supply water, and a cover  140  sealing the water supply unit  200 . 
     The housing  110  includes a housing body  112  in which the detergent case  120  is accommodated, an opening  114  formed at a front portion of the housing body  112  so that the detergent case  120  is withdrawn therethrough, an outlet  118  formed at a lower portion of the housing body  112  to guide the water containing the detergent and the fabric softener to be discharged to the outside of the detergent supply device  100 . The outlet  118  is connected to the connection pipe  54 , the water containing the detergent and fabric softener discharged through the outlet  118  is supplied into the tub  20  via the connection pipe  54 . The lower portion of the housing body  112  is inclined toward the outlet  118  so that the water containing the detergent and the fabric softener may be naturally discharged through the outlet  118  without being accumulated in the housing body  112 . 
     The detergent case  120  is installed to be movable through the opening  114  of the housing  110 . The detergent case  120  includes a detergent case body  120   a , a detergent accommodating part  130  formed inside the detergent case body  120   a , and a liquid detergent accommodating part  121  and a softener accommodating part  122  partitioned through a partition wall  125 . 
     The detergent accommodating part  130  is provided to accommodate a solid detergent. The liquid detergent accommodating part  121  is divided from the detergent accommodating part  130  through a first partition wall  125   a . The liquid detergent accommodating part  121  is provided to accommodate a liquid detergent, and includes a siphon tube  121   a  protruding a predetermined length from the bottom of the liquid detergent accommodating part  121  and a siphon cap (not shown) coupled to the outside of the siphon tube  121   a . The softener accommodating part  122  may be divided from the detergent accommodating part  130  through the first partition wall  125   a  and may be divided from the liquid detergent accommodating part  121  through a second partition  125   b.    
     The detergent accommodating part  130  is provided with a rotating member  131  rotatably coupled thereto and dissolve a solid detergent. The detergent accommodating part  130  may have a rotating shaft  132  that is formed in a protruding manner to rotatably support the rotating member  131  thereon. The rotating member  131  may be rotatably installed on the rotating shaft  132  inside the detergent accommodating part  130 . The rotating member  131  may include a plurality of blades  131   a.    
     Accordingly, the rotating member  131  is supplied with water through the water supply unit  200 , which is described below, and as the plurality of vanes  131   a  are rotated around the rotating shaft  132 , a vortex is generated, so that the solid detergent inside the detergent accommodating part  130  is dissolved. 
     The detergent accommodating part  130  is provided at a rear side with a drain part  133  so that the detergent dissolved water is drained. The drain part  133  is formed at the rear end of the detergent accommodating part  130  while sloping downward at a predetermined angle so that the detergent dissolved water moves to the rear side of the detergent accommodating part  130 . 
     On the other hand, the water supply unit  200  disposed on the upper portion of the detergent case  120  includes a plurality of water supply channels  300 ,  400 , and  500  that are provided to move the water supplied from an external water supply source (not shown) to the detergent accommodating part  130 , the liquid detergent accommodating part  121 , and the softener accommodating part  122  of the detergent case  120 , respectively. 
     The water supply unit  200  may include a plurality of supply pipes  241 ,  242 , and  243  provided to supply water to the plurality of water supply channels  300 ,  400 , and  500 . The plurality of supply pipes  241 ,  242 , and  243  may include a first supply pipe  241 , a second supply pipe  242 , and a third supply pipe  243 . 
     The plurality of water supply channels  300 ,  400 , and  500  include a detergent accommodating part channel  300  arranged above the detergent accommodating part  130  of the detergent case  120  to supply water to the detergent accommodating part  130 , a liquid detergent accommodating part channel  400  arranged above the liquid detergent accommodating part  121  of the detergent case  120  to supply water to the liquid detergent accommodating part  121 , and a softener accommodating part channel  500  arranged above the softener accommodating part  122  of the detergent case  120  to supply water to the softener accommodating part  122 . 
     Although the first supply pipe  241  and the second supply pipe  242  supply water to the detergent accommodating part channel  300 , and the third supply pipe  243  supplies water to the liquid detergent accommodating part channel  400  and the softener accommodating part channel  500  in the embodiment of the disclosure, the disclosure is not limited thereto. 
     The water supply unit  200  may include a first water supply frame  210  and a second water supply frame  220  arranged below the first water supply frame  210 . 
     The first water supply frame  210  may include a first water supply frame body  211  and a first water supply frame base  212 . The first water supply frame base  212  is provided below the first water supply frame body  211 . The first water supply frame base  212  may be provided to correspond to the upper portion of the housing  110 . A locking protrusion  111  is provided at an outer upper side of the housing  110  to be coupled and fixed to the first water supply frame base  212 . At least two fastening hooks  213  may be formed on the first water supply frame base  212 . The locking protrusion  111  may be formed at an outer upper circumference of the housing body  112  so as to be caught with the fastening hook  213  of the first water supply frame base  212 . 
     The first water supply frame body  211  is provided above the first water supply frame base  212 . The first water supply frame body  211  may be provided with the detergent accommodating part channel  300  for guiding water to the detergent accommodating part  130 , a liquid detergent accommodating part channel  400  for guiding water to the liquid detergent accommodating part  121 , and the softener accommodating part channel  500  for guiding water to the softener accommodating part  122 . 
     The first water supply frame body  211  may be provided with the first supply pipe  241 , the second supply pipe  242 , and the third supply pipe  243  for supplying water to the plurality of water supply channels  300 ,  400 , and  500 . The first supply pipe  241 , the second supply pipe  242 , and the third supply pipe  243  may be disposed at a rear side of the first water supply frame body  211 . In addition to the plurality of supply pipes  241 ,  242 , and  243 , a discharge pipe  243  may be provided at the rear side of the first water supply frame body  211  to discharge water overflowed from the water supply channels  300 ,  400 , and  500 . 
     The first water supply frame body  211  may be provided at an inner side with channel forming ribs  311 ,  321 ,  401 , and  501  for forming the detergent accommodating part channel  300 , the liquid detergent accommodating part channel  400 , and the softener accommodating part channel  500 . 
     The first water supply frame body  211  may include a first water supply channel forming rib  311  and a second water supply channel forming rib  321  provided to form a first water supply channel  310  and a second water supply channel  320 , which will be described below, to guide the water to the detergent accommodating part  130 , and a liquid detergent accommodating part channel forming rib  401  provided to guide the water to the liquid detergent accommodating part channel  400 , and a softener accommodating part channel forming rib  501  provided to guide the water to the softener accommodating part channel  500 . 
     The liquid detergent accommodating part channel  400  includes a plurality of liquid detergent accommodating part water supply holes  402  formed at a position corresponding to an upper portion of the liquid detergent accommodating part  121  such that water supplied from the third supply pipe  243  is guided by the liquid detergent accommodating part channel forming rib  401  to the liquid detergent accommodating part  121 . 
     The softener accommodating part channel  500  includes a plurality of softener accommodating part water supply holes  502  formed at a position corresponding to an upper portion of the softener accommodating part  122  such that water supplied from the third supply pipe  243  is guided by the softener accommodating part channel forming rib  501  to the softener accommodating part  122 . 
     On the other hand, the cover  140  may be coupled to the upper portion of the first water supply frame body  211  to seal the water supply unit  200 . 
     The first water supply frame  210  of the water supply unit  200  includes the first water supply channel  310  provided to guide water to a first area A corresponding to the detergent accommodating part  130 . The first water supply channel  310  is formed such that water supplied through the first supply pipe  241  is guided through the first water supply channel forming rib  311  to a plurality of spray nozzles  313 . 
     The first water supply frame  210  includes the plurality of spray nozzles  313  disposed in the first area A of the detergent case  120 . The plurality of spray nozzles  313  are arranged to form a one-direction rotational water current by the water sprayed into the first area A. The plurality of spray nozzles  313  may be disposed within the first area A of the detergent case  120 . The plurality of spray nozzles  313  are formed downward from the first water supply frame  210  while having an angled portion θ. The one-direction rotational water current formed by water supplied through the plurality of spray nozzles  313  may be provided to rotate the rotating member  131 . Although the spray nozzles are illustrated as including four spray nozzles in the embodiment of the disclosure, the disclosure is not limited thereto. For example, the number of spray nozzles may be equal to or greater than four, or equal to or less than four. 
     The second water supply frame  220  may be disposed below the first water supply frame  210 . The second water supply frame  220  is disposed and installed at a lower side of the first water supply frame  210  corresponding to the detergent accommodating part  130 . The second water supply frame  220  is coupled to the first water supply frame  210  by a coupling part  340 . The first water supply frame  210  is provided with at least one coupling protrusion  341  for coupling with the second water supply frame  220 . The second water supply frame  220  is provided at both sides with coupling grooves  342  corresponding to the coupling protrusion  341 . 
     The second water supply frame  220  may include a second water supply channel  320  that guides water to a second area B whose at least a portion is located outside the circumference of the first area A. Although the second area B is illustrated as being located outside the circumference of the first area A in the embodiment of the disclosure, the disclosure is not limited thereto. For example, at least a portion of the second area may overlap the first area. 
     The second water supply channel  320  is formed such that the water supplied through the second supply pipe  242  is guided through the second water supply channel forming rib  321  to be moved to a plurality of water supply holes  327 . The plurality of water supply holes  327  may be formed to correspond to the upper portion of the second area B of the detergent case  120 . 
     The second water supply channel forming rib  321  may connect the second supply pipe  242  of the first water supply frame  210  to a communication hole  238 . The communication hole  238  allows the first water supply frame  210  to communicate with the second water supply frame  220  so as to transfer water supplied to the first supply pipe  241  to the second water supply frame  220 . The communication hole  238  is formed in the first water supply frame  210 . 
     The water supplied through the communication hole  238  passes through the plurality of water supply holes  327  of the second water supply channel  320  formed in the second water supply frame  220  and is guided to the second area B of the detergent case  120 . 
     The second water supply channel forming rib  321  may be formed to guide the water guided through the communication hole  238  to the plurality of water supply holes  327  of the second water supply frame  220 . 
     The second water supply frame  220  may include a spray nozzle installation part  325  through which the plurality of spray nozzles  313  of the first water supply frame  210  passes to be installed. The spray nozzle installation part  325  may be formed to correspond to the plurality of spray nozzles  313  of the first water supply frame  210 . The spray nozzle installation part  325  may be disposed in the first area A of the detergent case  120 . 
     Meanwhile, the number of the plurality of water supply holes  327  formed in the second water supply channel  320  is more than the number of the plurality of spray nozzles  313  of the first water supply channel  310 . For example, the plurality of spray nozzles  313  may be provided as four spray nozzles, and the plurality of water supply holes  327  may be provided as four or more water supply holes. Such a difference in number between the plurality of spray nozzles  313  and the plurality of water supply holes  327  may cause a difference in the water pressure between the first water supply channel  310  and the second water supply channel  320 . 
     Therefore, the water supplied through the first supply pipe  241  guides water to the first area A of the detergent accommodating part  130  at a relatively high-water pressure through the four spray nozzles  313 . The four spray nozzles  313  form a rotational water current in one direction. When the rotating member  131  is rotated by the one-direction rotational water current formed by the spray nozzles  313 , detergent and water are splashed to the outside of the detergent accommodating part  130 , that is, to the second area B through the high water pressure and the plurality of blades  131   a.    
     In this case, the water supplied through the second supply pipe  242  guides water to the second area B of the detergent accommodating part  130  at a relatively low water pressure through the plurality of water supply holes  327 . The water guided to the second area B through the plurality of water supply holes  327  may guide detergent and water of the second area B into the detergent accommodating part  130 . 
     Water alternately supplied by each of the first supply pipe  241  and the second supply pipe  242  moves to a corresponding one of the first water supply channel  310  and the second water supply channel  320 . 
     Water moved through the first water supply channel  310  is guided to the first area A of the detergent accommodating part  130  through the plurality of spray nozzles  313 , and forms a one-direction rotational water current in the detergent accommodating part  130  through the plurality of spray nozzles  313 . At this time, the water and the detergent splashing to the outside of the detergent accommodating part  130 , that is, to the second area B is guided to the detergent accommodating part  130  through the plurality of water supply holes  327  by the water moved to the second water supply channel  320  through the second supply pipe  242 . 
     As such, the water is guided to the first area A and the second area B of the detergent accommodating part  130  through the first water supply channel  310  and the second water supply channel  320 , so that detergent is prevented from remaining in the detergent accommodating part  130 . 
     In addition, since water is scattered to the first and second areas A and B of the detergent accommodating part  130  while being evenly sprayed on the entire detergent case  120 , the cleanness of the detergent case  120  may be maintained. 
     Although few embodiments of the disclosure have been shown and described, the above embodiment is illustrative purpose only, and it would be appreciated by those skilled in the art that changes and modifications may be made in these embodiments without departing from the principles and scope of the disclosure, the scope of which is defined in the claims and their equivalents.