| 摘要 |
Disclosed is a capacity variable type rotary compressor and a driving method thereof. In the compressor, a first discharge port (11) is formed at a cylinder (10), a second discharge port (23) connected to the first discharge port (14) for discharging compressed gas into a casing (1) is formed at a main bearing (20), and a bypass hole (22) having a bypass valve (80) for providing compressed refrigerant gas to an inlet (12) is formed at the main bearing (20) between the first discharge port (14) and the second discharge port (23). ccordingly, a cooling capability is greatly lowered at the time of performing a capacity exclusion driving of the compressor, and the capacity exclusion driving can be maintained for a long time, thereby variously controlling an air conditioner and reducing unnecessary power waste of the compressor and the air conditioner to which the compressor is applied. Also, since a back pressure of a sliding valve (81) is fast and precisely switched by using a pilot valve (90) having a cheap cost and a high reliability, the method can be widely applied to a compressor or an air conditioner having a function for frequently varying a cooling capability. Therefore, the efficiency of the compressor or the air conditioner is prevented from being lowered. Besides, a bypass valve (110) is installed outside a casing of the compressor, thereby removing an additional back pressure switching unit and thus simplifying the entire system.
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