Piston, compressor and heat pump unit for compressor

The utility model relates to a piston, compressor and heat pump unit for compressor. An at least embodiment's piston for the compressor includes: piston only portion has the top surface, the top surface together forms the compression chamber to gaseous compress with the cylinder, and the teat, with along the axle direction of piston only portion is followed the outstanding mode of top surface andestablishing, the teat be with the size of the direction of axle direction quadrature is along with the orientation the front end of teat and the mode that diminishes forms, along with the section shape of the direction of axle direction quadrature is circular, right in the teat the connecting portion of top surface are followed the top surface orientation the front end of teat and undergauge gradually, and along the section of axle direction is the curved surface of concavity. The utility model discloses can restrain adiabatic efficiency's decline. 本实用新型涉及种压缩机用活塞、压缩机以及热泵单元。至少实施方式的压缩机用活塞包括：活塞本体部，具有顶面，所述顶面与气缸同形成对气体进行压缩