PISTON TYPE COMPRESSOR

To provide a piston type compressor capable of changing a flow rate of a refrigerant discharged from a compression chamber to a discharge chamber, and reducing power loss, vibration, and torque fluctuation in a low flow rate state.SOLUTION: In a piston-type compressor, a rotor 3 is rotatable integrally with a drive shaft 3, and intermittently communicated with first communication passage 29a-29f in accompany with rotation of the drive shaft 3. A spool 15 is moved in a drive shaft center O direction of the drive shaft 3 on the basis of a control pressure Pc, so that a third communication passage 15a which can be communicated with a second communication passage 3a and the like is formed. A suction valve 9 allows a refrigerant in a suction chamber 21a to be sucked into a compression chamber 41. The third communication passage 15a changes the flow rate of the refrigerant sucked into the compression chamber 41 from the suction chamber 21a by communicating the first communication passage 29a and the like communicated with the compression chamber 41 in a compression stroke or a discharge stroke, and the first communication passage 29a and the like communicated with the compression chamber 41 in a re-expansion stroke or a suction stroke, through the second communication passage 3a and 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、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、回転体３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２９ａ〜２９ｆと連通する。スプール１５は、制御圧力Ｐｃに基づき、駆動軸３の駆動軸心Ｏ方向に移動することで、第２連通路３ａ等と連通可能な第３連通路１５ａが形成されている。吸入弁９は、吸入室２１ａ内の冷媒を圧縮室４１に吸入させる。第３連通路１５ａは、第２連通路３ａ等を介して、圧縮行程又は吐出行程にある圧縮室４１に連通する第１連通路２９ａ等と、再膨張行程又は吸入行程にある圧縮室４１に連通する第１連通路２９ａ等とを連通させることにより、吸入室２１ａから圧縮室４１に吸入される冷媒の流量を変化させる。【選択図】図１