Air conditioner outdoor unit

Abstract

An air conditioner outdoor unit includes a box-shaped casing formed of a first metal, a heat exchanger that is at least partly formed of a second metal different in natural potential from the first metal and is disposed in the casing and fixed to the casing with a non-conductive member interposed therebetween, and capacitance connection sheet metal that is formed of the first metal or a third metal that does not cause dissimilar metal corrosion with the first metal and is disposed in the casing. The capacitance connection sheet metal is fixed to the casing and electrically connected to the casing, and is disposed with a space between the heat exchanger and the capacitance connection sheet metal and electrically connected to the heat exchanger through capacitance generated between the heat exchanger and the capacitance connection sheet metal.

1 . An air conditioner outdoor unit, comprising:
 a box-shaped casing formed of a first metal;   a heat exchanger at least partly formed of a second metal different in natural potential from the first metal, the heat exchanger being disposed in the casing and fixed to the casing with a non-conductive member interposed between the heat exchanger and the casing; and   capacitance connection sheet metal formed of the first metal or a third metal that does not cause dissimilar metal corrosion with the first metal, the capacitance connection sheet metal being disposed in the casing,   the capacitance connection sheet metal being fixed to the casing and electrically connected to the casing, the capacitance connection sheet metal being disposed with a space between the heat exchanger and the capacitance connection sheet metal and electrically connected to the heat exchanger through capacitance generated between the heat exchanger and the capacitance connection sheet metal.   
     
     
         2 . The air conditioner outdoor unit according to  claim 1 , wherein
 the casing includes a casing floor panel and a casing top panel disposed above the casing floor panel, and a casing front panel, a casing rear panel, and casing side panels connecting the casing floor panel and the casing top panel, and   the capacitance connection sheet metal is fixed to at least one of the casing floor panel, the casing top panel, the casing front panel, the casing rear panel, and the casing side panels.   
     
     
         3 . The air conditioner outdoor unit according to  claim 1 , wherein a dielectric is inserted into the space formed between the heat exchanger and the capacitance connection sheet metal. 
     
     
         4 . The air conditioner outdoor unit according to  claim 1 , wherein
 the first metal is one of iron and an iron alloy,   the third metal is the other of iron and an iron alloy, and   the second metal is aluminum or an aluminum alloy.   
     
     
         5 . The air conditioner outdoor unit according to  claim 1 , wherein
 the heat exchanger includes a planar heat exchanger side end extending in a vertical direction, and   the capacitance connection sheet metal includes a sheet metal facing wall disposed with the space between the heat exchanger side end and the sheet metal facing wall.   
     
     
         6 . The air conditioner outdoor unit according to  claim 5 , wherein
 the heat exchanger includes a pair of heat exchanger side surfaces extending in a direction away from the sheet metal facing wall from both edges of the heat exchanger side end in a direction perpendicular to the vertical direction,   the capacitance connection sheet metal includes a sheet metal side wall(s) extending toward the heat exchanger side surface(s) from one edge or both edges of the sheet metal facing wall in the direction perpendicular to the vertical direction, the sheet metal side wall(s) being disposed with a space between the heat exchanger side surface(s) and the sheet metal side wall(s), and   the space formed between the heat exchanger side end and the sheet metal facing wall and the space formed between the heat exchanger side surface(s) and the sheet metal side wall(s) communicate with each other.   
     
     
         7 . The air conditioner outdoor unit according to  claim 1 , wherein the capacitance connection sheet metal includes a cutout portion formed by cutting out a portion of the capacitance connection sheet metal. 
     
     
         8 . The air conditioner outdoor unit according to  claim 1 , wherein
 a portion of the casing and a portion of the heat exchanger are in contact with each other, and   a contact portion between the casing and the heat exchanger is covered with a covering member.   
     
     
         9 . The air conditioner outdoor unit according to  claim 2 , wherein
 a dielectric is inserted into the space formed between the heat exchanger and the capacitance connection sheet metal.   
     
     
         10 . The air conditioner outdoor unit according to  claim 2 , wherein
 the first metal is one of iron and an iron alloy,   the third metal is the other of iron and an iron alloy, and   the second metal is aluminum or an aluminum alloy.   
     
     
         11 . The air conditioner outdoor unit according to  claim 2 , wherein
 the heat exchanger includes a planar heat exchanger side end extending in a vertical direction, and   the capacitance connection sheet metal includes a sheet metal facing wall disposed with the space between the heat exchanger side end and the sheet metal facing wall.   
     
     
         12 . The air conditioner outdoor unit according to  claim 11 , wherein
 the heat exchanger includes a pair of heat exchanger side surfaces extending in a direction away from the sheet metal facing wall from both edges of the heat exchanger side end in a direction perpendicular to the vertical direction,   the capacitance connection sheet metal includes a sheet metal side wall(s) extending toward the heat exchanger side surface(s) from one edge or both edges of the sheet metal facing wall in the direction perpendicular to the vertical direction, the sheet metal side wall(s) being disposed with a space between the heat exchanger side surface(s) and the sheet metal side wall(s), and   the space formed between the heat exchanger side end and the sheet metal facing wall and the space formed between the heat exchanger side surface(s) and the sheet metal side wall(s) communicate with each other.   
     
     
         13 . The air conditioner outdoor unit according to  claim 2 , wherein the capacitance connection sheet metal includes a cutout portion formed by cutting out a portion of the capacitance connection sheet metal. 
     
     
         14 . The air conditioner outdoor unit according to  claim 2 , wherein
 a portion of the casing and a portion of the heat exchanger are in contact with each other, and   a contact portion between the casing and the heat exchanger is covered with a covering member.