Patent ID: 6973788

Claim:
A steam engine comprising: a fluid container in which working fluid is filled and the working fluid can move; a heating device for heating the working fluid in the fluid container and vaporizing the working fluid; and a cooling device for cooling down and liquidizing the steam vaporized by the heating device, wherein self-excited movement of the working fluid in the fluid container is generated by a repeated operation of vaporization and liquefaction of the working fluid by the heating device and the cooling device, wherein the fluid container comprises; a vertically extending outer pipe having an upper closed end at its upper end, the heating device and the cooling device being provided at an outer peripheral surface of the outer pipe and the heating device being arranged at a vertically higher than the cooling device; an inner pipe provided in the outer pipe and having a fluid inlet port for operatively communicating the inside of the inner pipe with the outside thereof; a pressure control device provided at a lower end of the inner pipe for opening and closing the fluid inlet port; a fluid injection port provided at an upper portion of the inner pipe for injecting the working fluid into a space defined by the outer pipe and the inner pipe, when pressure in the inner pipe is increased.