Heat transfer unit

Abstract

A heat transfer unit includes: an electrical component casing defining an internal space, the internal space housing a transformer together with a control board and a power supply board; and a cooling unit which cools an electronic component on the power supply board during operation of a compressor.

What is claimed is: 
     
         1 . A heat transfer unit comprising:
 a transformer connected to a power supply;   a control board to which power is supplied from the transformer;   a power supply board which supplies power from the power supply to a compressor;   an electrical component casing defining an internal space, the internal space housing the transformer together with the control board and the power supply board; and   a cooling unit which cools an electronic component on the power supply board during operation of the compressor.   
     
     
         2 . The heat transfer unit of  claim 1 , further comprising:
 a heat exchanger; and   a fan which transfers air passing through the heat exchanger, wherein   the electrical component casing has an air inlet and an air outlet, and   the air outlet opens toward a space on a suction side of the fan.   
     
     
         3 . The heat transfer unit of  claim 2 , wherein
 at least one portion of the transformer overlaps with the air outlet in a direction in which air passes through the air outlet.   
     
     
         4 . The heat transfer unit of  claim 2 , wherein
 the control board and the power supply board are disposed at a location other than a space between the transformer and the air outlet.   
     
     
         5 . The heat transfer unit of  claim 1 , wherein
 the cooling unit includes:   a heat transfer tube which is disposed outside the electrical component casing, and through which a refrigerant transferred by the compressor flows; and   a heat transfer member passing through the electrical component casing, and being in contact with a power module and the heat transfer tube, the power module being the electronic component on the power supply board.   
     
     
         6 . The heat transfer unit of  claim 3 , wherein
 the control board and the power supply board are disposed at a location other than a space between the transformer and the air outlet.   
     
     
         7 . The heat transfer unit of  claim 2 , wherein
 the cooling unit includes:   a heat transfer tube which is disposed outside the electrical component casing, and through which a refrigerant transferred by the compressor flows; and   a heat transfer member passing through the electrical component casing, and being in contact with a power module and the heat transfer tube, the power module being the electronic component on the power supply board.   
     
     
         8 . The heat transfer unit of  claim 3 , wherein
 the cooling unit includes:   a heat transfer tube which is disposed outside the electrical component casing, and through which a refrigerant transferred by the compressor flows; and   a heat transfer member passing through the electrical component casing, and being in contact with a power module and the heat transfer tube, the power module being the electronic component on the power supply board.   
     
     
         9 . The heat transfer unit of  claim 4 , wherein
 the cooling unit includes:   a heat transfer tube which is disposed outside the electrical component casing, and through which a refrigerant transferred by the compressor flows; and   a heat transfer member passing through the electrical component casing, and being in contact with a power module and the heat transfer tube, the power module being the electronic component on the power supply board.