Refrigeration cycle device and compressor used in same

Abstract

A refrigeration cycle device according to the present invention includes a compressor having a first compression chamber and a second compression chamber, a condenser, a decompressor, an evaporator, an injection path configured to introduce intermediate pressure refrigerant, a communication passage configured to introduce intermediate pressure refrigerant compressed in the first compression chamber to the second compression chamber, and a switch element configured to selectively make the second compression chamber communicate with the evaporator or make the second compression chamber communicate with the communication passage. The injection path introduces the intermediate pressure refrigerant to the second compression chamber. Single-stage compressing operation is performed when the second compression chamber is communicated with the evaporator, and two-stage compressing operation is performed when the second compression chamber is communicated with the communication passage.

1 . A refrigeration cycle device comprising:
 a compressor including a first compression chamber and a second compression chamber that are independent;   a condenser;   a decompressor;   an evaporator;   an injection path configured to introduce intermediate pressure refrigerant decompressed by the decompressor;   a first suction path configured to introduce low pressure refrigerant from the evaporator to the first compression chamber;   a second suction path configured to introduce low pressure refrigerant from the evaporator to the second compression chamber;   a communication passage configured to introduce intermediate pressure refrigerant compressed in the first compression chamber to the second compression chamber; and   a switch element configured to selectively make the second compression chamber communicate with the evaporator or make the second compression chamber communicate with the communication passage,   wherein   the injection path introduces the intermediate pressure refrigerant to the second compression chamber,   the refrigerant is compressed in the first compression chamber and the second compression chamber independently when the second compression chamber is communicated with the evaporator, and   refrigerant compressed in the first compression chamber is further compressed in the second compression chamber when the second compression chamber is communicated with the communication passage.   
     
     
         2 . The refrigeration cycle device according to  claim 1 , wherein
 the second suction path has a connection part connecting with the injection path on a downstream side of the switch element.   
     
     
         3 . The refrigeration cycle device according to  claim 1 , wherein
 a volume of the first compression chamber and a volume of the second compression chamber are equal.   
     
     
         4 . The refrigeration cycle device according to  claim 1 , wherein
 the compressor is provided around a shaft and has two eccentric shafts each performing eccentric rotation, and phases of the two eccentric shafts are deviated by 180 degrees.   
     
     
         5 . The refrigeration cycle device according to  claim 2 , wherein
 the second suction path has an upward gradient part between the connection part and the second compression chamber.   
     
     
         6 . The refrigeration cycle device according to  claim 1 , wherein
 inverter operation to arbitrarily change a rotation number of the compressor is performed.   
     
     
         7 . A compressor being the compressor included in the refrigeration cycle device according to any one of  claims 1  to  6 .