Fecha de publicación: 14/10/2019 Fuente: WIPO "bee" According to an embodiment of the present invention, freely rotating type fluid machinery comprises: a cylinder of which the inside is hollow, and an internal surface is formed to be elliptical; a rotor provided inside the cylinder and rotating about the same center as the center of the cylinder; a blade provided between the cylinder and the rotor; a tip provided between blades adjacent to each other such that the rotor is in contact with the internal surface of the cylinder while the rotor rotates; a separation preventing member connecting the blade and the tip to each other; and a driving roller provided between the blade and the rotor to maintain contact with the blade and the rotor while the rotor rotates, and configured to transmit a rotational force of the rotor to the blade. COPYRIGHT KIPO 2020