Variable-capacity compressor and refrigeration device having same

A refrigeration device, comprising:

• a variable-capacity compressor, comprising:
• a housing;
• a compression mechanism disposed in the housing and comprising two bearings and a cylinder assembly disposed between the two bearings;
• wherein:
• the cylinder assembly comprises a first cylinder and a second cylinder, the first cylinder and the second cylinder are each configured as a variable-capacity cylinder, and the first cylinder comprises a first compression chamber and a first suction port and the second cylinder comprises a second compression chamber and a second suction port;
• two first suction conduits connected to the first cylinder and the second cylinder respectively;
• and
• a first variable-capacity valve associated with the first cylinder and configured to be movable between a communication position where the first compression chamber is in fluid communication with the first suction port and an isolation position where the first compression chamber is isolated from the first suction port;
• a second variable-capacity valve associated with the second cylinder and configured to be movable between a communication position where the second compression chamber is in fluid communication with the second suction port and an isolation position where the second compression chamber is isolated from the second suction port;
• a first pressure supply passage in fluid communication with the first variable-capacity valve for supplying a first pressure gas or a second pressure gas, wherein a pressure of the first pressure gas is greater than that of the second pressure gas;
• a second pressure supply passage in fluid communication with the second variable-capacity valve for supplying the first pressure gas or the second pressure gas;
• wherein:
• when the first pressure supply passage supplies the second pressure gas and the second pressure supply passage supplies the first pressure gas, the first variable-capacity valve is at the communication position of the first variable-capacity valve and the second variable-capacity valve is at the isolation position of the second variable-capacity valve, such that the first cylinder operates and the second cylinder is at least partially unloaded,
• when the first pressure supply passage supplies the first pressure gas and the second pressure supply passage supplies the second pressure gas, the first variable-capacity valve is at the isolation position of the first variable-capacity valve and the second variable-capacity valve is at the communication position of the second variable-capacity valve, such that the first cylinder is at least partially unloaded and the second cylinder operates, and
• when the first pressure supply passage supplies the second pressure gas and the second pressure supply passage supplies the second pressure gas, the first variable-capacity valve is at the communication position of the first variable-capacity valve and the second variable-capacity valve is at the communication position of the second variable-capacity valve, such that both the first cylinder and the second cylinder operate.