Drum-shaped piston structure used in piston type compressor

The utility model relates to a drum-shaped piston structure used for piston type compressors. In the utility model, through holes on both ends of a piston body are respectively connected and communicated with a cavity body in the piston body, and molding sand and a core bar in the piston body are directly taken out from the through holes on both ends of the piston body. The through holes are larger and can ensure that molding sand and the inner core bar are cleanly cleaned without installing technological holes on the circumferential surface of the piston body, therefore the utility model has no need of the installation of screw stoppers, has no hidden danger of the desquamation of screw stoppers and has higher security. The utility model comprises the piston body and a piston rod, wherein piston annular grooves and guiding annular grooves are distributed on the circumferential surface of the piston body. The utility model is characterized in that a colloid in the piston body is connected and communicated with the through holes on the end parts of the piston body, the piston rod penetrates the cavity body and the through holes, and the outer part of the piston rod is sheathed with sleeve barrels on the positions corresponding to the cavity body and the through holes.