Dishwasher

Abstract

The present disclosure relates to a dishwasher. A dishwasher according to the present invention includes a tub forming a washing chamber for washing a washing target; a first circulation duct through which air discharged from the tub flow; an outside air inflow duct in which air introduced from an outside flow; a fan assembly sucking air thereinto from the first circulation duct and the outside air inflow duct and discharging the sucked air; a second circulation duct heating and supplying a portion of air discharged from the fan assembly to the tub; an exhaust duct discharging a remaining portion of air discharged from the fan assembly to the outside.

What is claimed is: 
     
         1 . A dishwasher comprising:
 a tub forming a washing chamber for washing a washing target;   a first circulation duct configured to flow air discharged from the tub flow;   an outside air inflow duct configured to flow air introduced from an outside;   a fan assembly configured to introduce and discharge air from the first circulation duct and the outside;   a second circulation duct configured to heat and supply a portion of air discharged from the fan assembly to the tub;   an exhaust duct configured to discharge a remaining portion of air discharged from the fan assembly to the outside.   
     
     
         2 . The dishwasher according to the  claim 1 ,
 wherein the second circulation duct comprises a circulation part heater heating the portion of air supplied to the tub.   
     
     
         3 . The dishwasher according to the  claim 1 , further comprising:
 a first mixing duct configured to mix air introduced from the first circulation duct and air introduced from the outside air inflow duct, and supply the mixed air to the fan assembly; and   a second mixing duct configured to supply air discharged from the fan assembly to each of the second circulation duct and the exhaust duct.   
     
     
         4 . The dishwasher according to the  claim 3 ,
 a first control valve controlling a ratio of air flowing from the first circulation duct into the first mixing duct and air flowing from the outside air inflow duct into the first mixing duct;   a second control valve controlling a ratio of air discharged from the second mixing duct to the second circulation duct and air discharged from the second mixing duct to the exhaust duct.   
     
     
         5 . The dishwasher according to the  claim 4 ,
 wherein the first control valve is disposed at a confluent portion of the first circulation duct and the outside air inflow duct, and rotates between a first circulation flow path formed inside the first circulation duct and an outside air flow path formed inside the outside air inflow duct, and controls the ratio of air flowing into the first circulation duct.   
     
     
         6 . The dishwasher according to the  claim 4 ,
 wherein the first control valve is disposed to reduce an inflow rate of the outside air flowing into the outside air inflow duct as a drying stage proceeds.   
     
     
         7 . The dishwasher according to the  claim 4 ,
 wherein the second control valve is disposed at a branching portion where the second mixing duct is branched into the second circulation duct and the exhaust duct, and rotates between a second circulation flow path formed inside the second circulation duct and the exhaust flow path formed inside the exhaust duct, and controls the ratio of air discharged respectively from the second mixing duct to the second circulation duct and the exhaust duct.   
     
     
         8 . The dishwasher according to the  claim 1 ,
 wherein a cross-sectional area of the first circulation duct and a cross-sectional area of the outside air inflow duct are formed differently in size to each other.   
     
     
         9 . The dishwasher according to the  claim 1 ,
 wherein a cross-sectional area of the second circulation duct and a cross-sectional area of the exhaust duct is formed differently in size.   
     
     
         10 . The dishwasher according to the  claim 1 ,
 wherein the first circulation duct and the outside air inflow duct are respectively connected to the fan assembly.   
     
     
         11 . The dishwasher according to the  claim 1 ,
 wherein a circulation duct inflow hole communicating the washing chamber and the first circulation duct is formed on top surface of the tub.   
     
     
         12 . The dishwasher according to the  claim 11 ,
 wherein the fan assembly is disposed under the tub such that air discharged from the circulation duct inflow hole flow downwardly.   
     
     
         13 . The dishwasher according to the  claim 12 ,
 wherein the first circulation duct is disposed to surface contact with an one outer surface of the tub.   
     
     
         14 . The dishwasher according to the  claim 12 ,
 wherein the outside air inflow duct is connected to the first circulation duct at one side of the tub between the circulation duct inflow hole and the fan assembly.   
     
     
         15 . The dishwasher according to the  claim 1 ,
 wherein the exhaust duct forms an exhaust port in front of an upper side of the tub.   
     
     
         16 . The dishwasher according to the  claim 1 ,
 wherein the exhaust duct is disposed to surface contact with the one lateral surface of the tub or the top surface of the tub.