Efficient stirling engine

An efficient stirling engine, comprising an expansion chamber with a heater and a compression chamber with a cooler, wherein the two chambers are connected through a regenerator, a passage between the heater and the expansion chamber is provided with a first valve system, a passage between the cooler and the compression chamber is provided with a second valve system, the first valve system closes or opens the passage between the heater and the expansion chamber, and the second valve system closes or opens the passage between the cooler and the compression chamber;

• wherein the expansion chamber and the compression chamber are located in a shifting air cylinder, and the shifting air cylinder is internally provided with a shifting air piston capable of moving back and forth in the shifting air cylinder;
• wherein each of the first valve system and the second valve system comprises a valve body and a guide rod arranged on the valve body, a tail end of the guide rod is located inside the shifting air piston, and a spring is arranged between the respective valve system and the shifting air piston;
• the first valve system closes or opens the passage between the heater and the expansion chamber under the driving of the shifting air piston;
• and the second valve system closes or opens the passage between the cooler and the compression chamber under the driving of the shifting air piston.