| 摘要 |
An air-conditioner is provided to improve the compressing performance by letting superheated steam in the constant capacity compressor even when the variable capacity compressor is unloaded and the bypass valve is on. An air-conditioner comprises constant capacity compressors(10b,10c), a variable capacity compressor(10a) in which coolant is compressed in the loading period and coolant is not compressed in the unloading period, a bypass pipe connecting the inlet and outlet sides of the variable capacity compressor, a bypass valve(16) which is installed in the bypass pipe and off in the loading period and becomes and on in the unloading period, steam injection ports(10a',10b',10c') which are provided in the constant capacity compressor and the variable capacity compressor and spray the superheated steam to a compression chamber, a superheated steam supply unit(15) supplying the superheated steam to the steam injection ports, and a steam shutoff valve(17) which is installed on the inlet side of the steam injection ports and off in the unloading period of the variable capacity compressor.
|
