Patent ID: 8490738

Claim:
A compressed air engine, comprising a housing, an impeller body and a primary power output shaft, wherein the impeller body is fixed on the primary power output shaft and located within the housing, an ejecting inlet is provided on the housing for ejecting air to the impeller body in the housing, a plurality of working chambers are provided on the circumference surface of the impeller body which matches with the inner surface of the housing, the inner surface of the housing closes the working chambers so that the compressed air ejected to the working chambers from the ejecting inlet pushes the impeller body to rotate and is temporarily stored in the working chamber, and an ejecting outlet is provided on the housing so that the compressed air temporarily stored in the working chamber expands outwards when the compressed air is rotated to the gas ejecting outlet and do work to further push the impeller body to rotate, wherein a first-order silencer chamber is provided on the housing, the ejecting outlet communicates with the first-order silencer chamber and the silencer chamber communicates with the outside of the housing through a first-order outlet proved on the housing, and wherein the silencer chambers comprise a continuous silencer grove or a plurality of intermittent silencer grooves.