PISTON-TYPE COMPRESSOR

To provide a piston-type compressor which can change a flow rate of a refrigerant discharged to a discharge chamber from a compression chamber, and can reduce a power loss, vibration and a torque variation in a low flow-rate state while simplifying a structure.SOLUTION: In this piston-type compressor, a rotating body integrated with, or different from a drive shaft 3 can rotate integrally with the drive shaft 3, and a second communication path 45a or the like for intermittently communicating with first communication paths 41Fa to 41Fe accompanied by the rotation of the drive shaft 3 is formed. A suction valve 9F or the like sucks a refrigerant in a suction chamber 21a or the like into a compression chamber 51F or the like. A control valve 13 controls a flow rate for returning the refrigerant in a discharge chamber 23b to the compression chamber 51F or the like. The refrigerant controlled by the control valve 13 is introduced to the compression chamber 51F or the like via the first communication paths 41Fa to 41Fe or the like and the second communication path 45a or the like, and changes the flow rate of the refrigerant discharged to the discharge chamber 21b or the like from the compression chamber 51F or the like.SELECTED DRAWING: Figure 1 【課題】圧縮室から吐出室へ吐出する冷媒の流量を変更可能であるとともに、構造の簡素化を実現しつつ、低流量状態における動力損失、振動及びトルク変動を低減可能なピストン式圧縮機を提供する。【解決手段】本発明のピストン式圧縮機では、駆動軸３と一体又は別体である回転体は、駆動軸３と一体回転可能であり、駆動軸３の回転に伴い間欠的に第１連通路４１Ｆａ〜４１Ｆｅ等と連通する第２連通路４５ａ等が形成されている。吸入弁９Ｆ等は、吸入室２１ａ等内の冷媒を圧縮室５１Ｆ等内に吸入させる。制御弁１３は、吐出室２３ｂ内の冷媒を圧縮室５１Ｆ等に戻す流量を制御する。制御弁１３で制御された冷媒が第１連通路４１Ｆａ〜４１Ｆｅ等及び第２連通路４５ａ等を介して圧縮室５１Ｆ等に導入され、圧縮室５１Ｆ等から吐出室２１ｂ等に吐出される冷媒の流量を変化させる。【選択図】図１