Patent ID: 7488166

Claim:
A rotary volumetric machine comprising a stator ( 9 ) in which a cylindrical chamber ( 2 ) is provided, a rotor disposed in the cylindrical chamber ( 2 ) and secured to a shaft ( 15 ), blades ( 3 , 7 ) formed on the rotor, and abutments ( 5 , 6 , 25 ) movable by actuating means between: a position extended into the volume of the cylindrical chamber ( 2 ) during the working phase so as to generate variations of volume between the blades ( 3 , 7 ) and the abutments ( 5 , 6 ); a retracted position within the stator ( 9 ) to permit the passage of the blades ( 3 , 7 ) from one side to the other of the abutments ( 5 , 6 , 25 ), wherein: the rotor comprises a disc ( 1 ), two concentric shoulders ( 4 , 8 ) disposed on opposite sides of said disc ( 1 ) and two fixed blades ( 3 , 7 ) disposed diametrically opposed on opposite sides of said disc ( 1 ) each against a surface of said disc ( 1 ) and secured to the periphery of a shoulder ( 4 , 8 ) so as to obtain an assembly that is balanced in rotation; in the extended position inside the volume of the cylindrical chamber ( 2 ), the abutments ( 5 , 6 , 25 ) are positioned adjacent but out of contact with the shoulders, ( 4 , 8 ); and the rotor is positioned axially on the one hand between the covers of the stator ( 12 and 13 ) secured to the stator ( 9 ) and on the other hand between roller bearings ( 10 and 16 ) with the help of crosspieces ( 11 and 14 ) whose length is defined such that the rotor turns without contacting said covers.