A capacity varying type
rotary compressor and a
refrigeration system having the same. The capacity varying type
rotary compressor comprises a casing containing a certain amount of oil and maintaining a
discharge pressure state; a motor installed in the casing and generating a driving force; one or more cylinder
assembly fixed in the casing, having a compression space for compressing a
refrigerant by a rolling
piston that performs an
orbit motion and a vane that performs a
linear motion by contacting the rolling
piston, and having a vane pressure chamber formed at a rear side of the vane, for implementing a normal driving as the vane contacts the rolling
piston or implementing a saving driving as the vane is separated from the rolling piston; and a
mode switching unit for selectively supplying suction pressure or a
discharge pressure to the vane pressure chamber of the cylinder
assembly according to a
driving mode. An installation of pipes can be simplified, a capacity varying ability can be easily controlled even when the compressor is driven, and the valve has less cooling capability loss thereby to enhance a driving efficiency. Furthermore, since the
refrigeration system can implement an easy
mode switching, comfort and energy saving are enhanced. Also, an interference between the pipes is prevented, thereby minimizing the
refrigeration system and enhancing an
assembly characteristic. Additionally, since the number of the valves of the refrigeration system is decreased, a production cost is reduced.