| 摘要 |
A trochoid-type rotary piston gas expansion device including a stationary housing and endwalls defining an epitrochoidal cavity closing where the cavity is symmetrical about a first axis transverse to the end walls, a rotatable crank shaft extending through the cavity parallel to the first axis, and having an eccentric portion located on the shaft in the cavity, a rotary piston mounted on the eccentric portion of the shaft so that the axial centerline of the piston describes a circular path of selected diameter during rotation thereof where the rotary piston includes flank surfaces which intersect at apices to determine lines of sealing contact with the walls of the cavity. At least two inlets are provided to the stationary housing to admit a compressed/expandable fluid into the chamber defined between the trochoidal cavity and a surface of the piston where the piston is in a first segment of its arc of rotation and outlets from the cavity for emission of fluid from the stationary housing when the piston is in a selected position in its arc of rotation. A rotary valve member is provided outside the housing to be rotated by the shaft having a valve port communicating with a supply of compressed fluid and periodically coming in alignment with the inlet to the chamber to sequentially open and close the inlet to the chamber for selected periods to selectively regulate the amount of fluid admitted to the chamber in accordance with the position of the piston surface.
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