Rotary steam engine

A rotary steam engine including:

• a stator mechanism including two stators and two stator seals, each of the two stators including an annular guide groove and two stator grooves extending radially inside and outside the annular guide groove, the annular guide grooves of the two stators axially corresponding to each other to form a track, the two stator seals being embedded in and clamped between the stator grooves of the two stators;
• a rotor rotatably arranged between the two stators and including a plurality of cylinders and a plurality of perorations, a cylinder wall of each cylinder including a plurality of slots, the plurality of perorations being open on an outer circumferential surface of the rotor and respectively in communication with interiors of the plurality of cylinders;
• a mandrel including a plurality of axial ventilation grooves corresponding to the plurality of cylinders, disposed through the stator mechanism and the rotor, and movable with the rotor;
• a plurality of pistons, each of upper and lower ends of each of the plurality of pistons including a piston seal, the plurality of pistons being respectively received in the plurality of cylinders and respectively including piston shafts which project axially beyond the plurality of slots and are movable along the track, a space in which each of the plurality of pistons and the piston seal are movable in the cylinder, a space between the two stator seals of the stator mechanism and the plurality of slots being in communication with one another to form an engine lubricating system;
• and
• a plurality of gas covers radially movable respectively, resiliently disposed on the stator mechanism and covered on an outer circumferential surface of the rotor, a gas injection space being formed between each gas cover and the outer circumferential surface of the rotor, each of the plurality of gas covers including a gas supplying passage in communication with the gas injection space and configured for entering steam;
• wherein when the gas injection space is in communication with the plurality of perorations, the steam enters the gas injection space via the gas supplying passage of each of the plurality of gas covers and enters the plurality of cylinders via the plurality of perorations to drive the plurality of pistons to move radially inward so that the rotor rotates relative to the stator mechanism;
• wherein when the gas injection space is not in communication with the plurality of perorations, the piston shafts of the plurality of pistons move along the track to move radially outward to discharge steam in the plurality of cylinders via the plurality of perorations.