Compressor unit of cryocooler

Abstract

A compressor unit of a cryocooler includes: a compressor motor; an inverter that converts, into drive power of the compressor motor, AC power input to the compressor unit from an external power source; a transformer that converts the AC power into drive power of a cold head of the cryocooler of which a voltage is different from a voltage of the AC power, and a control panel on which the inverter and the transformer are mounted.

What is claimed is: 
     
         1 . A compressor unit of a cryocooler, the compressor unit comprising:
 a compressor motor;   an inverter that converts, into drive power of the compressor motor, AC power input to the compressor unit from an external power source;   a transformer that converts the AC power into drive power of a cold head of the cryocooler of which a voltage is different from a voltage of the AC power; and   a control panel on which the inverter and the transformer are mounted.   
     
     
         2 . The compressor unit according to  claim 1 ,
 wherein the inverter includes an inverter exhaust port serving as an outlet for cooling air flowing from the inverter and is mounted on the control panel such that the inverter exhaust port is positioned above the transformer.   
     
     
         3 . The compressor unit according to  claim 1 ,
 wherein the transformer is disposed below the inverter.   
     
     
         4 . The compressor unit according to  claim 1 , further comprising:
 a switching power source that converts the AC power into DC power,   wherein the switching power source is mounted on the control panel.   
     
     
         5 . The compressor unit according to  claim 4 ,
 wherein the inverter includes an inverter exhaust port serving as an outlet for cooling air flowing from the inverter and is mounted on the control panel such that the inverter exhaust port is positioned above the switching power source.   
     
     
         6 . The compressor unit according to  claim 1 , further comprising:
 a noise filter and a DC reactor that are connected to the inverter,   wherein the noise filter and the DC reactor are mounted on the control panel.   
     
     
         7 . The compressor unit according to  claim 6 ,
 wherein the inverter includes an inverter exhaust port serving as an outlet for cooling air flowing from the inverter and is mounted on the control panel such that the inverter exhaust port is positioned above the noise filter and the DC reactor.   
     
     
         8 . The compressor unit according to  claim 6 ,
 wherein the noise filter and the DC reactor are disposed below the inverter and above the transformer.   
     
     
         9 . The compressor unit according to  claim 1 ,
 wherein the inverter includes an inverter exhaust port serving as an outlet for cooling air flowing from the inverter,   the compressor unit further comprises a compressor unit casing that includes a casing exhaust port serving as an outlet for the cooling air flowing from the compressor unit and that accommodates the compressor motor and the control panel, and   the control panel includes an exhaust duct that defines a flow path for the cooling air flowing from the inverter exhaust port to the casing exhaust port.   
     
     
         10 . The compressor unit according to  claim 9 ,
 wherein the compressor unit casing includes a casing intake port that is disposed below the casing exhaust port and that serves as an inlet for the cooling air flowing into the compressor unit.   
     
     
         11 . The compressor unit according to  claim 10 ,
 wherein the inverter is disposed closer to the casing exhaust port than the transformer is, and   the transformer is disposed closer to the casing intake port than the inverter is.   
     
     
         12 . The compressor unit according to  claim 9 ,
 wherein the exhaust duct includes a duct inlet component adjacent to the inverter exhaust port and a duct outlet component adjacent to the casing exhaust port, and   the duct inlet component is removable from the duct outlet component and the inverter.   
     
     
         13 . The compressor unit according to  claim 1 ,
 wherein a footprint of the compressor unit falls within a region having a width of about 600 mm or less and a length of about 500 mm or less.