Indoor unit and air conditioner

Abstract

An indoor unit includes a casing, a heat exchanger accommodated in the casing, and connection pipe, connected to the heat exchanger, through which a refrigerant flows. The connection pipe includes a first refrigerant pipe made of a first metal and a second refrigerant pipe made of a second metal higher in potential than the first metal. One end of the first refrigerant pipe is connected to the heat exchanger, and the other end of the first refrigerant pipe is connected to one end of the second refrigerant pipe in the casing.

What is claimed is: 
     
         1 . An indoor unit comprising:
 a casing;   a heat exchanger accommodated in the casing; and   a connection pipe, connected to the heat exchanger, through which a refrigerant flows, wherein   the connection pipe includes a first refrigerant pipe made of a first metal and a second refrigerant pipe made of a second metal higher in potential than the first metal, and   one end of the first refrigerant pipe is connected to the heat exchanger, and the other end of the first refrigerant pipe is connected to one end of the second refrigerant pipe in the casing.   
     
     
         2 . The indoor unit according to  claim 1 , wherein the other end of the first refrigerant pipe is above the one end of the second refrigerant pipe. 
     
     
         3 . The indoor unit according to  claim 1 , further comprising:
 a tubular member that covers a part of the connection pipe but does not cover the other part of the connection pipe, wherein   in the other part of the connection pipe, the other end of the first refrigerant pipe is connected to the one end of the second refrigerant pipe.   
     
     
         4 . The indoor unit according to  claim 1 , wherein the second refrigerant pipe includes a bent section that is bent to protrude downward and that is in the casing. 
     
     
         5 . An indoor unit comprising:
 a casing;   a heat exchanger accommodated in the casing;   a first connection pipe, through which a refrigerant flows, including a first refrigerant pipe made of a first metal and a second refrigerant pipe made of a second metal higher in potential than the first metal, wherein one end of the first refrigerant pipe is connected to the heat exchanger, and the other end of the first refrigerant pipe is connected to one end of the second refrigerant pipe in the casing, and   a second connection pipe, through which a refrigerant flows, including a third refrigerant pipe made of the first metal and a fourth refrigerant pipe made of the second metal, wherein
 one end of the third refrigerant pipe is connected to the heat exchanger, and the other end of the third refrigerant pipe is connected to one end of the fourth refrigerant pipe in the casing. 
   
     
     
         6 . The indoor unit according to  claim 5 , wherein
 the first connection pipe is a liquid pipe,   the second connection pipe is a gas pipe, and   the other end of the first refrigerant pipe is above the one end of the fourth refrigerant pipe in the casing.   
     
     
         7 . The indoor unit according to  claim 6 , wherein the first refrigerant pipe does not overlap the fourth refrigerant pipe as the casing is viewed from above. 
     
     
         8 . The indoor unit according to  claim 4 , wherein the bent section does not overlap an electric component in the casing as the casing is viewed from above. 
     
     
         9 . The indoor unit according to  claim 1 , wherein the other end of the first refrigerant pipe is connected to the one end of the second refrigerant pipe above a drain pan in the casing. 
     
     
         10 . An air conditioner comprising the indoor unit according to  claim 1 .