Patent Publication Number: US-2023147103-A1

Title: A wet duster module for a cleaner

Description:
TECHNICAL FIELD 
     The present disclosure relates to a wet duster module for a cleaner, more particularly, to a wet duster module for a cleaner for sucking or wiping dust or foreign matter in an area to be cleaned by discharging water to the duster. 
     BACKGROUND ART 
     A vacuum cleaner is a device that performs cleaning by sucking or wiping dust or foreign matter in an area to be cleaned. 
     Such a vacuum cleaner may be divided into a manual cleaner in which a user directly moves the cleaner to perform cleaning, and an automatic cleaner in which a user performs cleaning while driving by itself. 
     In addition, the manual cleaner may be classified into a canister-type cleaner, an upright-type cleaner, a handy-type cleaner, a stick-type cleaner, and the like, depending on a shape of the cleaner. 
     Such a cleaner may clean the floor using a cleaner head or a module. In general, a vacuum cleaner head or module may be used to suck air and dust. At this time, depending on a type of a head or module, a duster may be attached to clean the floor with the duster. 
     In addition, water may be discharged with a duster and a floor may be cleaned using a duster that has absorbed water. 
     Korean Patent Laid-Open No. 10-2019-0125917 (2019 Nov. 7) discloses a cleaner nozzle. 
     A conventional vacuum cleaner nozzle is provided with a water outlet for spraying water with a duster. At this time, the water outlet has a circular hole formed in the cylindrical body to discharge water. That is, the conventional outlet is formed without a height difference on the side wall or inner peripheral surface of the outlet. 
     However, in the case of the conventional water outlet as described above, there is a limitation in that the opening of the water outlet is blocked according to the difference in use environment and region because waterdrops are easily formed on the water outlet. 
     In other words, during use, dust or dirt may penetrate the outlet, cling to and block the outlet, and depending on regions, if using water containing compounds of calcium, the outlet may be clogged with the compounds of calcium in a state the waterdrops are condensed, as the waterdrops are dried up. 
     DISCLOSURE 
     Technical Problem 
     The present disclosure was created to improve the problems of the wet duster module of a conventional vacuum cleaner as described above, and an object of the present disclosure is to provide a wet duster module for a cleaner that prevents the water outlet from being clogged with foreign substances regardless of the use environment or area of use. 
     Technical Solution 
     One embodiment is a wet duster module for a cleaner including: a module housing having at least one or more suction flow paths through which air containing dust flows; a rotary cleaning unit disposed on a lower surface of the module housing, including at least one or more rotating plates to which a duster is coupled, and a driving motor for providing a rotational force to the rotating plate; and a water supply unit provided in the module housing and supplying water to the duster. 
     The water supply unit may include: a water tank mounted on the module housing and storing water supplied to the rotary cleaning unit; and a water supply nozzle for discharging water from the water tank to the duster. 
     The water supply nozzle may include: a nozzle body formed with a water supply path through which water introduced from the water tank flows and a water outlet for discharging water to the duster at one end thereof. 
     At one end of the nozzle body, an inclined surface may be formed at a predetermined angle with a water discharge direction so as to form the water outlet inclined. 
     The water supply nozzle may further include: a waterdrop guide wall extending along an axial direction from one end of the nozzle body to guide a flow of waterdrops formed on the water outlet. 
     The waterdrop guide wall may include: a guide surface formed in a shape of a surface forming a predetermined angle with the inclined surface and formed at a position forming a tangent line to an internal diameter of the water outlet. 
     The guide surface has an axial length formed to correspond to an axial height of the inclined surface. 
     The guide surface may include: a consecutive point connected to an inner peripheral surface of the water supply path. 
     The guide surface may be formed to have a height of one second or more and one fourth or less than a height in an axial direction from another end of the nozzle body to the consecutive point. 
     The guide surface may be formed to have a height of one third of a height in an axial direction from another end of the nozzle body to the consecutive point. 
     The water supply nozzle may further include a coupling frame coupled to the module housing to fix the nozzle body. 
     The water supply nozzle may further include a connection frame connecting the coupling frame and the nozzle body. 
     The module housing may include: a module base; and a module cover coupled to an upper side of the module base to form a space in which the water supply nozzle is accommodated. 
     The module cover may include: a cover body covering an upper side of the module base; and a first nozzle installation boss formed to protrude from an inner surface of the cover body toward the module base. 
     The coupling frame may include: a frame body formed outside the water supply nozzle; and a first mounting part formed at one end of the frame body and coupled to the first nozzle installation boss to fix the frame body. 
     The module cover may further include: a second nozzle installation boss formed to protrude at a predetermined distance from the first nozzle installation boss. 
     The coupling frame may further include: a second mounting part formed at another end of the frame body and coupled to the second nozzle installation boss to fix the frame body. 
     The first mounting part may include: a boss seating surface on which the first nozzle installation boss is seated; a boss receiving wall formed to protrude from the boss seating surface along a circumferential direction to receive the first nozzle installation boss therein; and a boss fastening hole formed in a form of a hole on the boss seating surface. 
     The second mounting part may include: a boss contact surface formed as a curved surface to be supported in contact with an outer peripheral surface of the second nozzle installation boss. 
     The second nozzle installation boss may include: a plurality of support ribs protruding outward from an outer peripheral surface thereof. 
     The second mounting part may further include: a boss support surface formed in a planar shape meeting the boss contact surface and contacted with the support rib. 
     The connection frame may include: a downward extension portion formed to extend in a direction in which water is discharged from the coupling frame; and a nozzle connecting portion formed by being bent and extending from the downward extension portion and connected to the nozzle body. 
     The water supply nozzle may further include: a water inlet formed in a hole shape at another end of the nozzle body in an axial direction to communicate with the water supply path, and through which water from the water tank is introduced. 
     The water supply path may be formed in a way a diameter thereof becomes narrower from the water inlet to the water outlet. 
     The water supply unit may further include: a water supply pipe connecting the water tank and the water supply nozzle and having a flow path for guiding water flowing from the water tank to the water supply nozzle. 
     The water supply nozzle may further include: a pipe supporting jaw formed to protrude from an outer circumferential surface of the nozzle body and inserted into the water supply pipe to support coupling with the water supply pipe. 
     The water outlet may be formed to be opened in an elliptical shape and have a height difference along an axial direction between both vertices in the opened long axis direction. 
     The inclined surface may be formed to be inclined at an angle of 15 degrees or more to 45 degrees or less to a central axis of the module body. 
     Advantageous Effect 
     As described above, according to the wet duster module for the cleaner according to the present disclosure, the water outlet is formed to be inclined to prevent waterdrops from forming while blocking the outlet, and there is an advantage of preventing the water outlet from being blocked as the waterdrops are dried up. 
     In addition, the guide wall is formed to extend at the end of the module so that waterdrops formed near the water outlet flow downward, thereby preventing the water outlet from being clogged. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG.  1    is a perspective view of the wet duster module for the cleaner according to an embodiment of the present disclosure. 
         FIG.  2    is a perspective view of the wet duster module for the cleaner according to an embodiment of the present disclosure viewed from another direction. 
         FIG.  3    is a perspective view of the wet duster module for the cleaner of  FIG.  1    viewed from a rear side. 
         FIG.  4    is an exploded perspective view illustrating the wet duster module for the cleaner of  FIG.  1   . 
         FIG.  5    is a perspective view for explaining a module cover in the wet duster module for the cleaner according to an embodiment of the present disclosure. 
         FIG.  6    is a perspective view illustrating a module base in the wet duster module for the cleaner according to an embodiment of the present disclosure. 
         FIG.  7    is a perspective view of the module base viewed from another direction in the wet duster module for the cleaner according to an embodiment of the present disclosure. 
         FIG.  8    is a view showing a water supply path for supplying water from a water tank to a rotary cleaning unit according to an embodiment of the present disclosure. 
         FIG.  9    is a view showing an arrangement of the rotating plate and the water supply nozzle according to an embodiment of the present disclosure. 
         FIG.  10    is a conceptual diagram illustrating a process in which water is supplied from a water tank to a rotary cleaning unit according to an embodiment of the present disclosure. 
         FIG.  11    is a perspective view illustrating a water supply nozzle according to an embodiment of the present disclosure. 
         FIG.  12    is a cross-sectional view of  FIG.  11   . 
         FIG.  13    is a front view for explaining a water supply nozzle according to an embodiment of the present disclosure. 
         FIG.  14    is a bottom view for explaining a state in which the water supply nozzle is coupled to the module cover according to an embodiment of the present disclosure. 
         FIG.  15    is a side view for explaining a water supply nozzle according to another embodiment of the present disclosure. 
     
    
    
     MODE FOR INVENTION 
     Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. 
     Since the present disclosure may have various changes and may have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the Mode for Invention. This is not intended to limit the present disclosure to specific embodiments, and should be construed to include all modifications, equivalents, and substitutes included in the spirit and scope of the present disclosure. 
     Though terms such as ‘a first’, or ‘a second’ are used to describe various components, these components are not confined by these terms. These terms are merely used to distinguish one component from the other component. For example, without departing from the scope of the rights of various embodiments of the present invention, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component. 
     The term “and/or” includes any and all combinations of one or more of the associated listed items. 
     When an element (or an area, a layer, a part and the like) is ‘on’ another element, is ‘connected’ with, or is ‘coupled’ to another element, the element may be directly connected with or coupled to another element or a third intervening element may be disposed therebetween. In contrast, it should be understood that when an element is referred to as being “directly coupled” or “directly connected” to another element, there are no intervening elements present. 
     The terms used in the present specification are merely used to describe particular embodiments, and are not intended to limit the present invention. An expression used in the singular encompasses the expression of the plural, unless it has a clearly different meaning in the context. 
     In the present specification, it is to be understood that terms such as “including”, “having”, and the like are intended to indicate the existence of the features, numbers, steps, actions, elements, parts, or combinations thereof disclosed in the specification, and are not intended to preclude the possibility that one or more other features, numbers, steps, actions, elements, parts, or combinations thereof may exist or may be added. 
     Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the related art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. 
     In addition, the exemplary embodiments are provided so that those skilled in the art may more completely understand embodiments of the present invention. Accordingly, shape, size, and the like of elements in the figures may be exaggerated for explicit comprehension. 
       FIGS.  1  and  2    are perspective views of the wet duster module for the cleaner according to an embodiment of the present disclosure.  FIG.  3    is a perspective view of the wet duster module for the cleaner of  FIG.  1    viewed from a rear side.  FIG.  4    is an exploded perspective view illustrating the wet duster module for the cleaner of  FIG.  1   . 
     Referring to  FIGS.  1  to  4   , the wet duster module  1  of the cleaner according to the embodiment of the present invention (hereinafter referred to as “wet duster module”) may include a module body  10  and a connection pipe  50  that is movably connected to the module body  10 . 
     The wet duster module  1  of the present embodiment may be used, for example, by being connected to a handy-type cleaner or connected to a canister-type cleaner. 
     That is, the wet duster module  1  may be detachably connected to the cleaner or an extension tube of the cleaner. Accordingly, the user may clean the floor using the wet duster module  1  as the wet duster module  1  is connected to the cleaner or the extension pipe of the cleaner. At this time, the cleaner to which the wet duster module  1  is connected may separate dust in the air in a multi-cyclone method. 
     The wet duster module  1  may have its own battery to supply power to an internal power consumption unit, or to operate by receiving power from the cleaner. 
     Since the vacuum cleaner to which the wet duster module  1  is connected includes a suction motor (not illustrated), the suction force generated by the suction motor is applied to the wet duster module  1 , and foreign substances on the floor and air may be sucked by the wet duster module  1 . 
     Therefore, in the present embodiment, the wet duster module  1  may perform a role of sucking foreign substances on the floor and air and guiding the substances to the vacuum cleaner. 
     The connection pipe  50  is connected to a center portion of a rear side of the module body  10 , and may guide the sucked air to the vacuum cleaner, but is not limited thereto. 
     If a direction of this embodiment is defined for better understanding, a part to which the connection pipe  50  is connected in the wet duster module  1  may be referred to as a rear side of the wet duster module  1 , and an opposite part of the connection pipe  50  may be referred to as a front of the wet duster module  1 . 
     The wet duster module  1  may further include a rotary cleaning unit  200  that is rotatably provided on a lower part of the module body  10 . 
     For example, the rotary cleaning unit  200  may be provided as a pair and arranged in a left-right direction. At this time, the pair of rotary cleaning units  200  may be rotated independently. For example, the rotary cleaning unit  200  may include a first cleaning unit  210  and a second cleaning unit  220 . 
     The rotary cleaning unit  200  may be combined with a duster  400 . The duster  400  may be formed in a form of a disk, for example. The duster  400  may include a first duster  410  and a second duster  420 . 
     The module body  10  may include a module housing  100  that forms an external shape. The module housing  100  may include suction flow paths  130   140  for sucking air. 
     The suction flow paths  130   140  may include a first path  130  extending in a left-right direction from the module housing  100 , and a second path  140  communicating with the first path  130  and extending in a front-rear direction. 
     The first path  130  may be formed, for example, at a front end of a lower surface of the module housing  100 . 
     The second path  140  may extend rearward from the first path  130 . For example, the second path  140  may extend rearward from a center portion of the first path  130  toward the connection pipe  50 . 
     In a state in which the rotary cleaning units  210  and  220  are connected to a lower part of the module body  10 , a portion of the dusters  410  and  420  protrudes to an outside of the wet duster module  1  and thus, cleaning not only a floor surface located below the duster module  1 , but also a floor surface located outside the wet duster module  1  is made possible. 
     For example, the dusters  410  and  420  may protrude not only toward both sides of the wet duster module  1  but also toward a rear side. 
     The rotary cleaning units  210  and  220  may be located, for example, on a rear side of the first path  130  in a lower part of the module body  10 . 
     Therefore, when cleaning while moving the wet duster module  1  forward, the floor may be wiped with the dusters  410  and  420  after foreign substances on the floor and air are sucked by the first path  130 . 
     In this embodiment, a first rotation center (C 1 ) of the first rotary cleaning unit  210  (for example, a rotation center of a rotation plate  211 ) and a second rotation center (C 2 ) of the second rotary cleaning unit  41  (for example, a rotation center of a rotation plate  221 ) are disposed to be spaced apart in left-right directions. 
     A center line (A 2 ) of the second path  140  may be positioned in a region between the first rotation center (C 1 ) and the second rotation center (C 2 ) (refer to  FIG.  9   ). 
     The rotation centers C 1  and C 2  of the rotary cleaning units  210  and  220  may be located farther from a front end of the module body  10  than the central axis that bisects a front and rear length of the module body  10 . This is to prevent the rotary cleaning units  210  and  220  from blocking the first path  130 . 
     Therefore, a front and rear horizontal distance between the central axis (Y) and the rotation centers C 1  and C 2  of the rotary cleaning units  210  and  220  may be set to a value greater than zero. 
     In addition, a distance between the rotation centers C 1  and C 2  of the rotary cleaning units  210  and  220  may be formed larger than a diameter of the dusters  410  and  420 . This is to reduce mutual friction caused by interference in the process of the dusters  410  and  420  being rotated, and to prevent an area that can be cleaned from being reduced as much as the interfered portion. 
     The module housing  100  may include a module base  110  and a module cover  120  coupled to an upper side of the module base  110 . 
     The first path  130  may be formed in the module base  110 . In addition, the module housing  100  may further include a flow path forming part  150  that forms the second path  140  together with the module base  110 . 
     The flow path forming part  150  may be coupled to an upper central portion of the module base  110 , and an end thereof may be connected to the connection pipe  50 . 
     Therefore, since the second path  140  may extend in a substantially straight line in a front and rear direction by the arrangement of the flow path forming part  150 , a length of the second path  140  may be minimized, so that path loss in the wet duster module  1  may be minimized. 
     A front portion of the flow path forming part  150  may cover an upper side of the first path  130 . The flow path forming part  150  may be disposed to be inclined upward from a front end toward a rear side. 
     Accordingly, a height of a front part of the flow path forming part  150  may be lower than a height of a rear side thereof. 
     According to the embodiment, since the height of the front part of the flow path forming part  150  is low, there is an advantage in that the height of the front part among an entire height of the wet duster module  1  may be reduced. The lower a height of the wet duster module  1 , the higher the possibility of cleaning by being drawn into a narrow space under a furniture or chair. 
     The connection pipe  50  includes a first connection pipe  510  connected to an end of the flow path forming part  150 , a second connection pipe  520  rotatably connected to the first connection pipe  510 , and a guide pipe  530  for communicating the first connector  510  and the second connector  520 . 
     A plurality of rollers for smooth movement of the wet duster module  1  may be provided under the module base  110 . 
     For example, the first roller  160  and the second roller  170  may be positioned at a rear of the first flow path  130  in the module base  110 . The first roller  160  and the second roller  170  may be disposed to be spaced apart in a left-right direction. 
     According to the embodiment, by disposing the first roller  160  and the second roller  170  behind the first flow path  130 , it becomes possible to connect the first path  130  to a front end of the module base  110  as close as possible, thus an area that may be cleaned using the wet duster module  1  may be increased. 
     As a distance from a front end of the module base  110  to the first path  130  increases, an area on which suction force does not act in a front of the first path  130  increases during the cleaning process, so an area left uncleaned increases. 
     On the other hand, according to the embodiment, the distance from the front end of the module base  110  to the first path  130  may be minimized, thereby a cleanable area may be increased. 
     In addition, by disposing the first roller  160  and the second roller  170  behind the first path  130 , the left and right length of the first path  130  may be maximized. 
     That is, a distance between both ends of the first path  130  and both end edges of the module base  110  may be minimized. 
     In the present embodiment, the first roller  160  may be located in a space between the first path  130  and the first duster  410 . In addition, the second roller  170  may be positioned in a space between the first path  130  and the second duster  420 . 
     The first roller  160  and the second roller  170  may be rotatably connected to shafts, respectively. The shafts may be fixed to a lower part of the module base  110  in a state in which the shafts are arranged to extend in a left-right direction. 
     A distance between the shaft and the front end of the module base  110  is longer than a minimum distance between the dusters  410  and  420  (or a rotating plate to be described later) and the front end of the module base  110 . 
     For example, between the shaft of the first roller  160  and the shaft of the second roller  170 , at least a portion of the rotary cleaning units  210  and  220  (duster and/or rotating plate) may be positioned. 
     According to this arrangement, the rotary cleaning units  210  and  220  may be positioned as close as possible to the first path  130 , so that an area being cleaned by the rotary cleaning units  210  and  220  among the floor surfaces on which the wet duster module  1  is located may be increased, thereby the floor cleaning performance may be improved. 
     The rollers  160  and  170  may support the wet duster module  1  at three points, although not limited thereto. That is, the roller may further include a third roller  180  provided on the module base  110 . 
     Further, the third roller  180  may be located at a rear of the dusters  410  and  420  to prevent interference with the dusters  410  and  420 . 
     In a state in which the dusters  410  and  420  are placed on a floor, the dusters  410  and  420  are pressed to be in close contact with the floor, the frictional force between the dusters  410  and  420  and the floor increases. In the embodiment, since the plurality of rollers are coupled to the lower part of the module base  110 , dusterility of the wet duster module  1  may be improved by the plurality of rollers. 
     Meanwhile, the module body  10  may further include a water tank  310  so as to supply water to the dusters  410  and  420 . 
     The water tank  310  may be detachably connected to the module housing  100 . In a state in which the water tank  310  is mounted on the module housing  100 , water in the water tank  310  may be supplied to the dusters  410  and  420 . 
     The water tank  310  may form an exterior of the wet duster module  1  in a state being mounted on the module housing  100 . 
     Substantially an entire upper wall of the water tank  310  may form an exterior of a top surface of the wet duster module  1 . Accordingly, a user may check that the water tank  310  is mounted or that the water tank  310  is separated from the module housing  100 . 
     The module body  10  may further include a separation controller  600  that operates to detach the water tank  310  in a state the water tank  310  is mounted on the module housing  100 . 
     In the embodiment, the separation controller  600  may be positioned above the second path  140 , for example. For example, the separation controller  600  may be disposed to overlap the center line (A 2 ) of the second path  140  in a vertical direction. 
     Accordingly, since the separation controller  600  is located in a center portion of the wet duster module  1 , the user may easily recognize the separation controller  600  and operate the separation controller  600 . 
     Meanwhile, the module body  10  may further include a water amount regulator  700  for adjusting an amount of water discharged from the water tank  310 . For example, the water amount regulator  700  may be located at a rear side of the module housing  100 . 
     The water amount regulator  700  may be operated by a user, and it is possible to operate that water may be discharged from the water tank  310  or that water may not be discharged, by the water amount regulator  700 . 
     Alternatively, the amount of water discharged from the water tank  310  may be adjusted by the water amount regulator  700 . For example, depending on an operation of the water amount regulator  700 , water may be discharged from the water tank  310  by a first amount per unit time, or water may be discharged by a second amount greater than the first amount per unit time. 
     The water amount regulator  700  may be provided to pivot in a left-right direction on the module housing  10  or may be provided to pivot in a vertical direction according to embodiments. 
     For example, in a state in which the water amount regulator  700  is positioned in a neutral position as shown in  FIG.  3   , the water discharge amount is 0, and by pushing a left side of the water amount regulator  700  to make the water amount regulator  700  pivoted to the left, water may be discharged from the water tank  310  by the first amount per unit time. 
     In addition, by pushing a right side of the water amount regulator  700  to make the water amount regulator  700  be pivoted to the right, water may be discharged from the water tank  310  by the second amount per unit time. 
     Meanwhile,  FIG.  5    is a perspective view for explaining a module cover in the wet duster module for the cleaner according to an embodiment of the present disclosure,  FIG.  6    is a perspective view illustrating a module base in the wet duster module for the cleaner according to an embodiment of the present disclosure and  FIG.  7    is a perspective view of the module base viewed from another direction in the wet duster module for the cleaner according to an embodiment of the present disclosure. 
     Referring to  FIGS.  4  to  7   , the module body  10  may further include a plurality of driving motors  212  and  222  for individually driving the rotary cleaning units  210  and  220 . 
     Specifically, the driving motors  212  and  222  may include a first driving motor  212  for driving the first rotary cleaning unit  210  and a second driving motor  222  for driving the second rotary cleaning unit  220 . 
     Since the driving motors  212  and  222  operate individually, even if some of the driving motors  212  and  222  fail, there is an advantage that rotation of some rotary cleaning units is possible by other driving devices. 
     The first driving motor  212  and the second driving motor  222  may be arranged to be spaced apart from each other in a left-right direction in the module body  10 . 
     In addition, the driving motors  212  and  222  may be located at a rear of the first path  130 . 
     For example, the second path  140  may be positioned between the first driving motor  212  and the second driving motor  222 . In this case, the first driving motor  212  and the second driving motor  222  may be disposed to be symmetrical with respect to the center line (A 2 ) of the second path  140 . 
     Accordingly, even if the driving motors  212  and  222  are provided, the second path  140  is not affected, thereby a length of the second path  140  may be minimized. 
     According to the present embodiment, it is possible to prevent both sides of the second flow path  140  from being biased toward the first driving motor  212  and the second driving motor  222 , respectively. 
     The driving motors  212  and  222  may be disposed in the module body  10 . For example, the driving motors  212  and  222  may be seated on the upper side of the module base  110  and covered by the module cover  120 . 
     That is, the driving motors  212  and  222  may be positioned between the module base  110  and the module cover  120 . 
     The rotary cleaning units  210  and  220  may further include rotating plates  211  and  221  that are rotated by receiving power from the driving motors  212  and  222 . 
     For example, the rotating plates  211  and  221  may include a first rotating plate  211  connected to the first driving motor  212  and to which the first duster  410  is attached, and a second rotating plate  221  connected to the second driving motor  222  and to which the second duster  420  is attached. 
     The rotating plates  211  and  221  may be formed in a disk shape, and the dusters  410  and  420  may be attached to a surface below the rotating plates  211  and  221 . 
     Specifically, the rotating plates  211  and  221  have an outer body  211   a  in the form of a circular ring, and an inner body  211   b  located in the center region of the outer body  211   a  and spaced apart from an inner circumferential surface of the outer body  211   a  and a plurality of connection ribs  211   c  connecting an outer circumferential surface of the inner body  211   b  and the inner circumferential surface of the outer body  211   a  (refer to  FIG.  9   ). 
     In addition, the rotating plates  211  and  221  are formed in the inner body  211   b , and may include a plurality of water passage holes  211   d  formed along a circumferential direction to supply water discharged through a water supply unit  300  to the dusters  410  and  420 . 
     Meanwhile, the rotating plates  211  and  221  may include a plurality of attachment means  211   e  formed on the outer body  211   a  along the circumferential direction and attaching the dusters  410  and  420  to the rotating plates  211  and  221 . For example, the attachment means  211   e  may be Velcro. 
     The rotating plates  211  and  221  may be connected to the driving motors  212  and  222  below the module base  110 . That is, the rotating plates  211  and  221  may be connected to the driving motors  212  and  222  from an outside of the module housing  100 . 
     The module cover  120  covers an upper side of the module base  110  and includes a cover body  121  that forms an outer shape of the wet duster module  1  of the present invention. 
     Meanwhile, a tank connection part  311  through which a valve (not illustrated) in the water tank  310  may be operated and water may flow may be coupled to the module cover  120 . 
     The tank connection part  311  may be coupled to a lower part of the module cover  120 , and a part thereof may pass through the module cover  120  and protrude upward. 
     When the water tank  310  is seated on the module cover  120 , the tank connection part  311  protruding upward may pass through an outlet of the water tank  310  and be introduced into the water tank  310 . 
     A sealer may be provided on the module cover  120  to prevent water discharged from the water tank  310  from leaking around the tank connection part  311 . The sealer may be formed of, for example, a rubber material, and may be coupled to the module cover  120  from an upper side of the module cover  120 . 
     A water pump  340  for controlling discharge of water from the water tank  310  may be installed in the module cover  120 . The water pump  340  may be connected to a pump motor  350 . 
     The water pump  340  is a pump that expands or contracts while an internal valve body operates to communicate an inlet and an outlet, and may be implemented by a known structure, so a detailed description thereof will be omitted. 
     The valve body in the water pump  340  may be driven by the pump motor  350 . Accordingly, according to the present embodiment, while the pump motor  350  is operating, the water from the water tank  310  may be continuously and stably supplied to the rotary cleaning units  210  and  220 . 
     The operation of the pump motor  350  may be controlled by adjusting the above-described water amount regulator  700 . For example, the on/off of the pump motor  350  may be selected by the water amount regulator  700 . 
     Alternatively, an output (or rotational speed) of the pump motor  350  may be adjusted by the water amount regulator  700 . 
     The module cover  120  may further include one or more fastening bosses  124  to be coupled to the module base  110 . 
     In addition, a water supply nozzle  330  for discharging water to the rotary cleaning units  210  and  220  to be described later may be installed in the module cover  120 . For example, the water supply nozzle  330  may be provided as a pair, and a pair of water supply nozzles  330  may be installed on the module cover  120  while being spaced apart from each other on a left and right side. 
     In the module cover  120 , the nozzle installation bosses  122  and  123  for installing the water supply nozzle  330  may be provided. For example, the nozzle installation bosses  122  and  123  may be provided on both sides of the water supply nozzle  330 , and may include a first nozzle installation boss  122  and a second nozzle installation boss  123 . 
     Specifically, the first nozzle installation boss  122  may be formed to protrude from an inner surface of the cover body  121  toward the module base  110 . For example, the first nozzle installation boss  122  may be formed in a hollow cylindrical shape and be fixedly coupled to the water supply nozzle  330  by a screw. 
     In addition, the second nozzle installation boss  123  may be formed to protrude at a predetermined distance from the first nozzle installation boss  122 . For example, the second nozzle installation boss  123  may be formed at a symmetrical location to the first nozzle installation boss  122  with respect to the water supply nozzle  330 . 
     Meanwhile, in the second nozzle installation boss  123 , a plurality of support ribs  123   b  may protrude from an outer circumferential surface  123   a  toward an outside. For example, the second nozzle installation boss  123  may be formed in a hollow cylindrical shape. In addition, two support ribs  123   b  may be formed to protrude radially outward from the outer circumferential surface of the second nozzle installation boss  123  at a predetermined distance along an axial direction. For example, the support ribs  123   b  may be formed to protrude at an interval of 90 degrees with respect to an axial center of the second nozzle installation boss  123  (refer to  FIG.  14   ). 
     Accordingly, the water supply nozzle  330  may be coupled to and fixed to the first nozzle installation boss  122  and the second nozzle installation boss  123 . As a result, when an external shock is applied or a pressure according to water discharge is applied, the water supply nozzle  330  may be prevented from being separated from the module housing  100  or from being shaken. 
     The module base  110  may include a base body  111  on which the rotary cleaning unit  200  is mounted, and forming an outer shape of the wet duster module  1  of the present invention. 
     In addition, the module base  110  may include a pair of shaft through-holes  112  and  113  through which a transmission shaft connected to each of the rotating plates  211  and  221  in the driving motor passes. 
     The module base  110  is provided with seating grooves  112   a  and  113   a  for seating sleeves provided in the drive motors  212  and  222 , and the shaft through-holes  112  and  113  may be formed in the seating grooves  112   a  and  113   a.    
     The seating grooves  112   a  and  113   a  are, for example, formed in a circular shape and may be formed by being depressed downwardly from the module base  110 . In addition, the shaft through-holes  112  and  113  may be formed at a bottom of the seating grooves  112   a  and  113   a.    
     As the sleeves provided in the driving motors  212  and  222  are seated in the seating grooves  112   a  and  113   a , horizontal movement of the driving motors  212  and  222  may be restricted during travelling of the wet duster module  1  or operation of the driving motors  212  and  222 . 
     A protruding sleeve protruding downward is provided at a position corresponding to the seating grooves  112   a  and  113   a  on a bottom surface of the module base  110 . The protruding sleeve is a portion formed while the bottom surface of the module base  110  protrudes downward as the seating grooves  112   a  and  113   a  are substantially depressed downward. 
     In a state in which the path forming unit  150  is coupled to the module base  110 , the shaft through-holes  112  and  113  may be disposed on both sides of the path forming unit  150 . 
     The module base  110  may include a substrate installation unit  114  on which a control substrate  800  (or a first substrate) for controlling the driving motors  212  and  222  is installed. For example, the substrate installation part  114  may be formed in a form of a hook extending upward from the module base  110 . 
     The hook of the substrate installation unit  114  is caught on an upper surface of the control substrate  800 , thereby restricting upward movement of the control substrate  800 . 
     The control substrate  800  may be installed in a horizontal state. In addition, the control substrate  800  is installed to be spaced apart from a bottom of the module base  110 . 
     This is to prevent water from coming into contact with the control substrate  800  even if water falls to the bottom of the module base  110 . To this end, the module base  110  may be provided with a support protrusion  114   a  for supporting the control substrate  800  to be spaced apart from the bottom of the module base  110 . 
     The substrate installation unit  114  may be located at one side of the path forming unit  150  in the module base  110 , although not limited thereto. For example, the control substrate  800  may be disposed adjacent to the water amount regulator  700 . 
     Accordingly, the switch installed on the control substrate  800  may detect operation of the water amount regulator  700 . 
     The module base  110  may further include a motor support rib  116  for supporting bottoms of the driving motors  212  and  222 . 
     The motor support rib  116  protrudes from the module base  110  and is bent one or more times, thereby separating the driving motors  212  and  222  from the bottom of the module base  110 . 
     Alternatively, a plurality of motor support ribs  116  each spaced apart may protrude from the module base  110 , thereby separating the driving motors  212  and  222  from the bottom of the module base  110 . 
     Even if water falls to the bottom of the module base  110 , the driving motors  212  and  222  are spaced apart from the bottom of the module base  110  by the motor support rib  116 , thus, flowing of water toward the driving motors  212  and  222  may be minimized. 
     In addition, since the sleeves of the driving motors  212  and  222  are seated in the seating groove  116   a , even if water falls to the bottom of the module base  110 , entry of the water flowing into an interior of the driving motors  212  and  222  may be prevented by the sleeves. 
     In addition, the module base  110  may further include a nozzle hole  117  through which the water supply nozzle  330  passes. 
     A portion of the water supply nozzle  330  coupled to the module cover  120  may pass through the nozzle hole  117  when the module cover  120  is coupled to the module base  110 . 
     In addition, the module base  110  may further include a path fastening boss  118  for fastening with the flow path forming part  150 . 
     In a state in which the rotary cleaning units  210  and  220  are coupled to the bottom of the module base  110 , a plate receiving part  119  recessed upward may be provided on a bottom surface of the module base  110  so that the first flow path  130  may become as close as possible to a floor surface on which the wet duster module  1  is placed. 
     In addition, height increase of the wet duster module  1  in a state in which the rotary cleaning units  210  and  220  are coupled to the wet duster module  1  by the plate receiving unit  119  may be minimized. 
     In a state in which the rotating plates  211  and  221  are positioned in the plate receiving part  119 , the rotating plates  211  and  221  may be coupled to the driving motors  212  and  222 . 
     The module base  110  may be provided with a bottom rib  111   b  disposed to surround the shaft through-holes  112  and  113 . The bottom rib  111   b  may protrude downward from a lower surface of the plate receiving part  119 , for example, and may be formed in a circular ring shape. 
     The shaft through-holes  116  and  118  and the nozzle hole  117  may be positioned in an area formed by the bottom rib  111   b.    
       FIG.  8    is a view showing a water supply path for supplying water from a water tank to a rotary cleaning unit according to an embodiment of the present disclosure,  FIG.  9    is a view showing an arrangement of the rotating plate and the water supply nozzle according to an embodiment of the present disclosure, and  FIG.  10    is a conceptual diagram illustrating a process in which water is supplied from a water tank to a rotary cleaning unit according to an embodiment of the present disclosure. 
     Referring to  FIGS.  8  to  10   , the wet duster module  1  of the present disclosure connects the water tank  310  and the water supply nozzle  330 , and may further include a water supply pipe  320  in which a path guiding the water flowing from the water tank  310  to the water supply nozzle  330  is formed. 
     Specifically, the water supply pipe  320  may include a first water supply pipe  321  for supplying water from the water tank  310  to the water pump  340 , a second water supply pipe  322  for supplying water from the water pump  340  to a connector  323  to be described later, and a third water supply pipe  324  for supplying water introduced into the connector  323  to the water supply nozzle  330 . 
     The water pump  340  may include a first connection port  341  to which the first water supply pipe  321  is connected, and a second connection port  342  to which the second water supply pipe  322  is connected. With respect to the water pump  340 , the first connection port  341  is an inlet, and the second connection port  342  is an outlet. 
     In addition, the water supply pipe  320  of the present disclosure may further include the connector  323  to which the second water supply pipe  322  is connected. 
     The connector  323  may be formed in a shape in which a first connection portion  323   a , a second connection portion  323   b , and a third connection portion  323   c  are arranged in a T-shape. The second water supply pipe  322  may be connected to the first connection portion  323   a.    
     The third water supply pipe  324  may include a first branch pipe  324   a  connected to the second connection portion  323   b  and a second branch pipe  324   b  connected to the third connection portion  323   b.    
     Accordingly, the water flowing through the first branch pipe  324   a  may be supplied to the first rotary cleaning unit  210 , and the water flowing through the second branch pipe  324   b  may be supplied to the second rotary cleaning unit  220 . 
     The first branch pipe  324   a  and the second branch pipe  324 b may be connected to the water supply nozzle  330 . The water supply nozzle  330  also forms a path for supplying water. 
     Accordingly, after water supplied to the first water supply pipe  321  is introduced into the water pump  340 , the water flows into the second water supply pipe  322 . The water flowing into the second water supply pipe  322  flows to the first branch pipe  324   a  and the second branch pipe  324   b  by the connector  323 . In addition, the water flowing into the first branch pipe  324   a  and the second branch pipe  324   b  is discharged from the water supply nozzle  330  toward the rotary cleaning units  210  and  220 . 
     The water sprayed from the water supply nozzle  330  is supplied to the dusters  410  and  420  after passing through the water passage holes  211   d  of the rotating plates  211  and  221 . The floor is wiped while rotating in a state absorbing the water supplied to the dusters  410  and  420 . 
       FIG.  11    is a perspective view illustrating a water supply nozzle according to an embodiment of the present disclosure,  FIG.  12    is a cross-sectional view of  FIG.  11   ,  FIG.  13    is a front view for explaining a water supply nozzle according to an embodiment of the present disclosure, and  FIG.  14    is a bottom view for explaining a state in which the water supply nozzle is coupled to the module cover according to an embodiment of the present disclosure. 
     Referring to  FIGS.  5 ,  6 , and  9  to  14   , the water supply nozzle  330  of the present disclosure is configured to discharge the water from the water tank  310  to the dusters  410  and  420 . 
     The water supply nozzle  330  may be mounted on the module cover  120  and be accommodated in a space formed inside the module cover  120 . 
     For example, the water supply nozzles  330  may be mounted in a pair on the module housing  100  and arranged in a left-right direction. In addition, the pair of water supply nozzles  330  arranged in the left-right direction may be formed in a shape symmetrical to each other (reflection). Accordingly, in the present embodiment, description is based on the water supply nozzle  330  mounted on a left side, but the present disclosure is not limited thereto, and even a case in which the water supply nozzle  330  is formed symmetrically thereto is included in the present disclosure. 
     The water supply nozzle  330  may include a nozzle body  331  in which a water supply path  335  through which water introduced from the water tank  310  may flow is formed. 
     Specifically, the nozzle body  331  is formed in a hollow shape so that the water supply path  335  is formed therein, and at one end of the nozzle body  331  in an axial direction, a water outlet  332  for discharging water to the dusters  410  and  420  is formed, and a water inlet  336  through which water from the water tank  310  flows may be formed at the other end of the nozzle body  331  in the axial direction. At this time, the water supply path  335 , the water outlet  332 , and the water inlet  336  are formed to communicate with each other so as to form one flow path to supply the water introduced from the water tank  310  to the dusters  410  and  420 . 
     For example, the nozzle body  331  may be formed in a cylindrical shape so that the water supply path  335  may be formed therein, and a diameter of the water supply path  335  may get narrower from the water inlet  336  to the water outlet  332 . That is, the diameter of the water inlet  336  may be greater than a diameter of the water outlet  332 . 
     Accordingly, flow velocity may be increased as water introduced into the water inlet  336  gradually passes through the narrow passage, and the present disclosure has an effect of preventing water from forming on the water outlet  332  thanks to such a structure. 
     Meanwhile, the nozzle body  331  extends downward through the nozzle hole  117 . That is, the water outlet  332  is exposed to an outside of the module housing  100 . 
     As such, when the water outlet  332  is positioned in the outside the module housing  100 , water sprayed through the water outlet  332  may be prevented from being introduced into the module housing  100 . 
     At this time, an upwardly recessed groove is formed in a bottom of the module base  110  to prevent the water outlet  332  exposed to the outside of the module housing  100  from being damaged, and the water outlet  332  may be positioned within the groove, with the water outlet  332  passing through the nozzle hole  117 . That is, the nozzle hole  117  may be formed in the groove. 
     In addition, the water outlet  332  may be disposed to face the rotating plates  420  and  440  from the groove. The lower surface of the water outlet  332  may be located at the same height as the lower surface of the module base  110  or may be located higher. 
     Water sprayed from the water outlet  332  may pass through the water passage hole  211 d of the rotating plates  211  and  221 . 
     A minimum radius of the water passage hole  211   d  at a center of the rotation plates  211  and  221  is R 2 , and a maximum radius of the water passage hole  211   d  at the center of the rotation plates  211  and  221  is R 3 . 
     A radius from the center of the rotating plates  211  and  221  to a center of the water outlet  332  is R 4 . At this time, R 4  is greater than R 2  and smaller than R 3 . 
     In addition, D 1 , which is a difference between R 3  and R 2 , is formed to be greater than a diameter of the water outlet  332 . 
     Further, D 1 , which is the difference between R 3  and R 2 , is formed to be smaller than a minimum width (W 1 ) of the water passage hole  211   d.    
     In addition, when external diameters of the rotating plates  211  and  221  are R 1 , R 3  may be formed to be greater than a half of R 1 . 
     A line vertically connecting the first rotation center (C 1 ) and a center line (A 1 ) of the first path  130  may be referred to as a first connection line (A 6 ), and a line vertically connecting the second rotation center (C 2 ) and the center line (A 1 ) of the first path  130  may be referred to as a second connection line (A 7 ). 
     At this time, the first connection line (A 6 ) and the second connection line (A 7 ) are positioned in an area between the pair of water outlets  332  for supplying water to the rotary cleaning units  210  and  220 . 
     That is, a horizontal distance (D 3 ) between the water outlet  332  and the center line (A 2 ) of the second path  114  is longer than the horizontal distance (D 2 ) from the rotation centers C 1  and C 2  of each of the rotation plates  211  and  221  to the center line (A 2 ) of the second path  114 . 
     This is to prevent water flowing through the second path  114  from being suctioned into the wet duster module  1  in a rotation process of the rotating plates  211  and  221 , since the second path  114  extends from a center portion of the wet duster module  1  in a front-rear direction. 
     A horizontal distance between the water outlet  332  and the center line (A 1 ) of the first path  112  is shorter than a horizontal distance between the rotation centers C 1  and C 2  and the center line (A 1 ) of the first path  112 . 
     The water outlet  332  is located opposite to an axis line of the driving motors  212  and  222  with respect to the connection lines A 6  and A 7 . 
     Meanwhile, when the nozzle body  331  is formed in a hollow shape as described above, waterdrops may form on an end of the nozzle body  331  in a water discharging direction. That is, when water pressure is no longer applied from the water pump  340  as the discharge of water is finished, water remaining in the water supply pipe  320  or the water supply nozzle  330  is formed on an end of the nozzle body  331  without falling to the ground or falling downward in a gravity direction due to adhesive force. At this time, when evaporation of water occurs in a state in which waterdrops are formed on an end of the nozzle body  331 , the water outlet  332  may be blocked. 
     More specifically, dust or dirt generated during use penetrates and adheres to the waterdrops formed on the water outlet  332 , thereby the water outlet may be blocked. Alternatively, when water containing compounds of calcium is used depending on an area of use, the water outlet  332  may be clogged with the compounds of calcium in a state the waterdrop is condensed, as the waterdrop dries up. 
     In order to solve this, at one end of the nozzle body  331  according to the embodiment of the present disclosure, an inclined surface  333  is formed at a predetermined angle (α) with the water discharging direction so as to form the water outlet  332  to be inclined. 
     That is, the inclined surface  333  is formed in a shape similar to a cutting surface obtained by cutting the nozzle body  331  at a predetermined angle. 
     For example, the inclined surface  333  may be formed to be inclined at 15 degrees or more to 45 degrees or less with respect to a central axis (a) of the nozzle body  331  formed in a cylindrical shape. 
     The water outlet  332  is opened (formed) in an elliptical shape on the inclined surface  333 . 
     Specifically, the water outlet  332  formed at one end of the nozzle body  331  is formed (opened) on the inclined surface  333 . At this time, since the water outlet  332  communicates with the water supply path  335  formed in a circular hollow shape, its shape is similar to a cylinder cut obliquely. Accordingly, when viewed from an upper side perpendicular to the inclined surface  333 , the water outlet  332  is formed in an elliptical shape. 
     In addition, the water outlet  332  is formed to be inclined at a predetermined angle (α) with respect to an axis (a) direction of the nozzle body  331 . 
     For example, the water outlet  332  may be inclined at an angle of 15 degrees or more to 45 degrees or less to the central axis of the nozzle body  331  formed in a cylindrical shape. 
     Therefore, since the water outlet  332  is inclined with the central axis of the nozzle body  331  and is formed in an elliptical shape, there may be a height difference (H) between both vertices in a long axis direction of the water outlet  332  along an axial direction. 
     For example, the water outlet  232  may be formed in an elliptical shape, so that a first vertex  332   a  and a second vertex  332   b  may be formed at both vertices in the long axis direction of the ellipse. At this time, a height (h 2 +h 3 ) from another axial end of the nozzle body  331  to the first vertex  332   a  may be formed higher than a height (h 2 +h 3 −H) from another axial end of the nozzle body  331  to the second vertex  332   b.    
     Therefore, when waterdrops are formed in the water supply nozzle  330  after water is discharged from the water supply nozzle  330 , the waterdrops flow downward along the inclined surface  333  due to gravity, and do not block the water outlet  232 . 
     Moreover, when there is a height difference (H) between both vertices in the long axis direction of the water outlet  332 , an area to which waterdrops may be attached becomes narrow. Accordingly, the waterdrops formed on the water outlet  332  do not form on the water outlet  332 , but fall due to gravity. 
     Therefore, according to the present disclosure, it is possible to prevent the waterdrops from forming on the water outlet  332 , and it is possible to prevent the water outlet  332  from being blocked by foreign substances dissolved in the waterdrops. 
     On the other hand, the water supply nozzle  330  of the present disclosure may further include a waterdrop guide wall  334  extending along the axial direction from one end of the nozzle body  331  in order to guide flow of waterdrops condensed on the water outlet  332 . 
     The waterdrop guide wall  334  is formed as a surface forming a predetermined angle with the inclined surface  333 , and may include a guide surface  334   a  formed at a position forming a tangent line with an inner wall of the water outlet  332 . 
     For example, the guide surface  334   a  is formed similarly to a cross-sectional shape of the cylindrical nozzle body  331  cut along an axial direction. 
     In addition, the guide surface  334   a  may be connected to an inner peripheral surface of the water supply path  335  at one point. That is, the guide surface  334   a  and the water supply path  335  may contact with each other at the first vertex  332   a . In addition, the guide surface  334   a  and the inner peripheral surface of the water supply path  335  may form a continuous line without being inflected at the first vertex  332   a  (thus the first vertex  332   a  may be referred to as a consecutive point  334   b ). 
     Meanwhile, the guide surface  334   a  may have an axial length corresponding to an axial height of the inclined surface  333 . 
     For example, a height (h 1 : height of the guide surface  334   a ) from the consecutive point  334   b  to one end of the guide surface  334   a  in an axial direction (an end in a water discharging direction) and a height from the consecutive point  334   b  to another end of the inclined surface  333  in an axial direction (an end in a direction into which water is introduced) may be formed to have the same height (h 2 ) (h 1 =h 2 ). 
     In addition, a height from one end of the guide surface  334   a  in an axial direction to another end of the inclined surface  333  in an axial direction (h 1 +h 2 ) may be formed to be equal to a height (h 3 ) from another end of the nozzle body  331  to another end of the inclined surface  333  in an axial direction (h 1 +h 2 =h 3 ). 
     In addition, the height (h 1 ) of the guide surface  334   a  may be formed to be one second or more to one fourth or less than the axial height (h 2 +h 3 ) from another end of the nozzle body  331  to the consecutive point  334   b , and preferably, it may be formed to a height of one third of the axial height (h 2 +h 3 ) from another end of the nozzle body  331  to the consecutive point  334   b.    
     Therefore, according to the present disclosure, when the waterdrop is generated in the water supply nozzle  330 , it flows downward in a direction of gravity along the guide surface  334   a  by gravity. Therefore, it is possible to prevent the waterdrops from forming on the water outlet  332 , and it is possible to prevent the water outlet  332  from being clogged with foreign substances, as the waterdrops evaporate. 
     Meanwhile, the water supply nozzle  330  is formed to protrude from an outer circumferential surface of the nozzle body  331 , and may further include a pipe supporting jaw  339  which is inserted into the water supply pipe  320  to support coupling with the water supply pipe  320 . 
     For example, the pipe supporting jaw  339  may be located on another side of the nozzle body  331 , may be formed to protrude outward in a radial direction from an outer circumferential surface of the nozzle body  331 , and may be inserted into an inside of the third water supply pipe  324 . 
     At this time, an end of the third water supply pipe  324  surrounds the outer circumferential surface of the nozzle body  331 , and the end of the third water supply pipe  324  tightens the outer circumferential surface of the nozzle body  331  by elasticity of the third water supply pipe  324 . In addition, the pipe supporting jaw  339  forms a step with the outer circumferential surface of the nozzle body  331 , thereby preventing the end of the third water supply pipe  324  from being separated from the nozzle body  331 . 
     The water supply nozzle  330  may further include a coupling frame  337  coupled to the module housing  100  to fix the nozzle body  331 . 
     Specifically, the coupling frame  337  includes a frame body  337   a , a first mounting part  337   b , and a second mounting part  337   c.    
     The frame body  337   a  is formed outside the nozzle body  331 . For example, the frame body  337   a  may be formed in a form of an arc or a curved frame surrounding the outside of the nozzle body  331 . 
     The first mounting part  337   b  may be formed at one end of the frame body  337   a  and may be coupled to the first nozzle installation boss  122  to fix the frame body  337   a.    
     Specifically, the first mounting part  337   b  may include a boss seating surface  337   ba  on which the first nozzle installation boss  122  is seated, a boss receiving wall  337   bb  formed to protrude from the boss seating surface along a circumferential direction to receive the first nozzle installation boss therein, and a boss fastening hole  337   bc  formed in a form of a hole at a center of the boss seating surface  337   ba.    
     Also, the first mounting part  337   b  may be disposed to a position corresponding to positions of the first nozzle installation boss  122  of the module cover  120  and the fastening hole  115  of the module base  110 . 
     For example, the boss receiving wall  337   bb  may be formed to have an inner diameter corresponding to an outer diameter of the first nozzle installation boss  122 , and the boss fastening hole  337   bc  may be formed to have a shape corresponding to the fastening hole  115 . 
     Accordingly, in order to couple the water supply nozzle  330  to the module housing  100 , the first nozzle installation boss  122  may be seated on the first mounting part  337   b  and may be screw-coupled from a lower surface of the module base  110 , through the fastening hole  115 . 
     Therefore, the module housing  100  and the water supply nozzle  330  may be firmly coupled by the first mounting part  337   b.    
     The second mounting part  337   c  may be formed at another end of the frame body  337   a , and may be coupled to the second nozzle installation boss  123  to fix the frame body  337   a.    
     Specifically, the second mounting part  337   c  may include a boss contact surface  337   ca  formed as a curved surface so as to be in contact with and supported by the outer circumferential surface  123   a  of the second nozzle installation boss  123  and may include a boss support surface  337   cb  formed to have a planar shape meeting the boss contact surface  337   ca  and is in contact with the support rib  123   b.    
     For example, the boss contact surface  337   ca  is formed in an arcuate shape to surround the outer circumferential surface  123   a  of the second nozzle installation boss  123 , and the support rib  123   b  is fitted to the boss support surface  337   cb  to be supported. 
     Accordingly, according to the second mounting part  337   c , the second nozzle installation boss  123  may be inserted to fix the water supply nozzle  330 . In particular, the boss support surface  337   cb  is formed on the second mounting part  337   c , and the support rib  123   b  is fitted and the boss support surface  337   cb  is supported thereby, thus fixing force of the water supply nozzle  330  may be maintained without a separate fixing member such as a screw. 
     Therefore, according to the coupling frame  337 , the first mounting part  337   a  and the second mounting part  337   b  fix both sides of the nozzle body  331 , thereby preventing the nozzle body  331  from shaking or departing. 
     The water supply nozzle  330  may further include a connection frame  338  connecting the coupling frame  337  and the nozzle body  331 . 
     The connection frame  338  may include a downward extension portion  338   a  and a nozzle connecting portion  338   b.    
     The downward extension portion  338   a  may be formed to extend in a direction (lower side) in which water is discharged from the coupling frame  337 . For example, the downward extension portion  338   a  may be formed to extend downwardly from a lower surface of the frame body  337   a  in a pillar shape having a predetermined thickness. In this case, on an outer surface of the downward extension portion  338   a , a support pillar  338   aa  may further protrude toward the nozzle body  331  in order to improve the supporting force of the downward extension portion  338   a.    
     The nozzle connecting portion  338   b  may be bent and extended from the downward extension portion  338   a  to be connected to the nozzle body  331 . For example, the nozzle connecting portion  338   b  is bent and extended from a lower end of the downward extension portion  338   a , and is formed to extend in parallel by a predetermined length toward the nozzle body  331 , and as both ends thereof extending in parallel in a width direction are closing up, the nozzle connecting portion  338   b  may be connected to the outer circumferential surface of the nozzle body  331 . 
     Meanwhile, although not limited thereto, the nozzle connecting portion  338   b  may be connected to a position equal to or less than a half (lower side) of the nozzle body  331 . This structure has an effect of reducing shaking of the nozzle body  331 . 
     On the other hand,  FIG.  15    is a side view for explaining a water supply nozzle according to another embodiment of the present disclosure. 
     Except the parts specifically mentioned, a water supply nozzle  1330  of this embodiment has the same structure and effect as the water supply nozzle  330  according to the embodiment of the present disclosure, so the water supply nozzle  330  may be referred to. 
     At one end of the nozzle body  1331  according to the present embodiment, an inclined surface  1333  is formed at a predetermined angle with the water discharging direction so as to form the water outlet  1332  inclined. 
     That is, the inclined surface  1333  is formed in a shape similar to a cutting surface obtained by cutting the nozzle body  1331  at a predetermined angle. 
     As an example, the inclined surface  1333  may be an elliptical plane formed by being inclined at 15 degrees or more to 45 degrees or less with respect to the central axis of the nozzle body  1331  formed in a cylindrical shape. 
     The water outlet  1332  is opened (formed) in an elliptical shape on the inclined surface  1333 . 
     Specifically, the water outlet  1332  formed at one end of the nozzle body  1331  is formed (opened) on the inclined surface  1333 . 
     In addition, the water outlet  1332  is formed to be inclined at a predetermined angle with respect to an axial direction of the nozzle body  1331 . 
     For example, the water outlet  1332  may be inclined at an angle of 15 degrees or more to 45 degrees or less to the central axis of the nozzle body  1331  formed in a cylindrical shape. 
     Accordingly, since the water outlet  1332  is inclined with the central axis of the nozzle body  1331  to form an elliptical shape, a height difference may occur between vertices of both sides of the water outlet  1332  in a long axis direction along the axial direction. 
     Therefore, when waterdrops are generated in the water supply nozzle  1330  after water is discharged from the water supply nozzle  1330 , the waterdrops flow downward along the inclined surface  1333  due to gravity, and do not block the water outlet  1332 . 
     Moreover, when there is a height difference (H) between the vertices of both sides of the long axis direction of the water outlet  1332 , an area to which the waterdrops may be attached becomes narrow. Accordingly, the waterdrops generated on the water outlet  1332  do not form on the water outlet  1332  but fall due to gravity. 
     Therefore, according to the present disclosure, without a separate structure for guiding the waterdrop flow, it is possible to prevent waterdrops from forming on the water outlet  1332 , and to prevent the water outlet  1332  from being clogged by foreign substances dissolved in the waterdrop. 
     On the other hand, in this embodiment, a coupling frame  1337  and a connection frame  1338  and a pipe supporting jaw  1339  have the same structure and effect as the coupling frame  337 , the connection frame  338  and the pipe supporting jaw  339  according to the embodiment of the present disclosure, therefore, the description thereof may be referred to. 
     Although the present disclosure has been described in detail through specific embodiments, it is intended to describe the present disclosure in detail, and the present disclosure is not limited thereto. Further, it will be apparent to those skilled in the art that various modifications can be made to the above-described exemplary embodiments of the present disclosure without departing from the spirit or scope of the invention. 
     All of the simple modifications or changes of the present invention belong to the scope of the present invention, and the specific scope of the present invention may be apparent by the accompanying claims.