Dishwasher

Abstract

A dishwasher is provided that prevents foreign materials from remaining lodged in a filter. The dishwasher may include a sump in which washing fluid is collected, a filter provided in the sump so as to separate foreign materials from the washing fluid, and a cleaning device including at least one blade that scrapes foreign materials from the filter as the cleaning device moves, either in a rotating direction or a linear direction.

1 . A dishwasher comprising:
 a washing space in which a rack for receiving dishes and a nozzle for spraying washing water are disposed;   a sump in which the washing water supplied into the washing space is collected;   a filter part disposed in the sump to filter foreign substances contained in the washing water;   a rotation part comprising a blade rotatably contacting the filter part;   a driving part providing a driving force to the rotation part; and   a rotation shaft separably coupled to the rotation part, the rotation shaft comprising a hook selectively hooked to the rotation part.   
     
     
         2 . The dishwasher according to  claim 1 , wherein the rotation shaft extends upward from the driving part, and the rotation part is inserted into the outside of the rotation shaft. 
     
     
         3 . The dishwasher according to  claim 1 , wherein the driving part is a bi-directional motor rotatable in clockwise and counter clockwise directions, and
 when the driving part is rotated in the clockwise or counter clockwise directions, the hook is hooked to the rotation part.   
     
     
         4 . The dishwasher according to  claim 1 , wherein the driving part is a unidirectional motor rotatable in clockwise and counter clockwise directions, and
 when the rotation part is rotated in a direction opposite to a rotation direction of the unidirectional motor, the rotation part is hooked to the hook.   
     
     
         5 . The dishwasher according to  claim 1 , further comprising:
 a shaft coupling part disposed on the rotation part, the shaft coupling part being coupled to the rotation shaft; and   a hook rib disposed inside the shaft coupling part, the hook rib being hooked to the hook.   
     
     
         6 . The dishwasher according to  claim 5 , wherein the hook rib comprises:
 a hook support part disposed on an inner circumference surface of the shaft coupling part, the hook support part supporting the hook; and   a stopper interfering with the rotation shaft when the rotation shat is rotated at a preset angle.   
     
     
         7 . The dishwasher according to  claim 5 , wherein the hook rib is provided in plurality, and
 when the driving part is rotated in the clockwise or counter clockwise directions, one hook rib of the plurality of hook ribs is coupled to the hook.   
     
     
         8 . The dishwasher according to  claim 7 , wherein the plurality of hook ribs are disposed in directions facing each other. 
     
     
         9 . The dishwasher according to  claim 5 , wherein the rotation shaft comprises:
 a body part coupled to a motor shaft of the driving part;   a hook part having a sectional area less than that of the body part, the hook part comprising a hook; and   a support part defining a boundary between the body part and the hook part, the support part supporting the rotation part.   
     
     
         10 . The dishwasher according to  claim 9 , wherein the support part has the same diameter as that of the body part, and
 the hook part has a shape cut inward from an outer circumference surface of the support part.   
     
     
         11 . The dishwasher according to  claim 1 , wherein the hook part comprises a recessed part recessed inward from an outer circumference surface, and
 the hook is disposed on an end of a side of the recessed part.   
     
     
         12 . The dishwasher according to  claim 11 , wherein the recessed part and the extending hook form a bent part. 
     
     
         13 . The dishwasher according to  claim 1 , wherein the hook is provided in plurality. 
     
     
         14 . The dishwasher according to  claim 1 , wherein the filter part comprises:
 a first filter; and   a second filter receiving the first filter therein, the second filter additionally filtering the washing water passing through the first filter.   
     
     
         15 . The dishwasher according to  claim 14 , wherein the rotation part is disposed in a space between the first filter and the second filter. 
     
     
         16 . A dishwasher comprising:
 a washing space in which a rack for receiving dishes and a nozzle for spraying washing water are disposed;   a sump in which the washing water supplied into the washing space is collected;   a washing pump disposed adjacent to the sump, the washing pump supplying the washing water into a spray arm;   a filter member filtering foreign substances existing in the washing water before the washing water inflowing into the sump is introduced into the washing pump;   a filter housing receiving the filter member;   a rotation shaft rotatably disposed on a side of the filter housing; and   a cleaning unit separably coupled to the rotation shaft to clean the foreign substances attached to the filter member,   wherein the cleaning unit comprises a rotation part selectively coupled to the rotation shaft according to a direction in which the rotation shaft is coupled.   
     
     
         17 . The dishwasher according to  claim 16 , wherein the rotation part comprises:
 a shaft coupling part in which the rotation shaft is disposed in one direction and inserted; and   a hook rib hooked to the rotation shaft in a state where the rotation shaft is disposed in the other direction.   
     
     
         18 . The dishwasher according to  claim 17 , wherein the rotation shaft comprises:
 a recessed part which is recessed inward; and   a hook defined as an end of a side of the recessed part, the hook being hooked to the hook rib.   
     
     
         19 . The dishwasher according to  claim 18 , wherein the recessed part comprises first and second recessed parts facing each other, and
 each of the first and second recessed parts comprises the hook.   
     
     
         20 . The dishwasher according to  claim 16 , wherein the rotation part comprises a shaft coupling part receiving the rotation shaft while the rotation part is moved downward, and
 when the rotation part is rotated in a preset direction, the rotation part is hooked to the rotation shaft.   
     
     
         21 . A dishwasher comprising:
 a washing space in which a rack for receiving dishes and a nozzle for spraying washing water are disposed;   a sump in which the washing water supplied into the washing space is collected;   a filter part disposed in the sump to filter foreign substances contained in the washing water;   a rotation part rotatably disposed inside the filter part;   a blade contacting the rotation part to clean foreign substances of the filter part;   a rotation shaft separably coupled to the rotation part, the rotation shaft comprising first and second recessed parts; and   a plurality of hook ribs disposed on the rotation part, the hook ribs interfering with the plurality of recessed parts.   
     
     
         22 . The dishwasher according to  claim 21 , wherein the plurality of hook ribs comprise:
 one hook rib interfering with the first recessed part when the rotation part is rotated in a clockwise direction; and   another hook rib interfering with the second recessed part when the rotation part is rotated in a counter clockwise direction.   
     
     
         23 . The dishwasher according to  claim 21 , wherein the rotation part further comprises a shaft coupling part in which the rotation shaft is received, and
 the plurality of hook ribs protrude from an inner circumference surface of the shaft coupling part in direction facing each other.