Patent ID: 9587500
Date: 2017-03-07
CPC Classifications: F01D,F05D,F16J

Claim:
1. Fluid sealing device for rotating machines with a rotor part rotating in and relatively to a stator part or a case in the presence of fluid, where: the rotor portion comprises at least one disk carried by a rotating shaft supported by bearings and provided with at least one sealing system defining a first environment at a first pressure; the stator part has a wall in front of the disk of the rotor part; the rotor part and the stator part delimit between them a second environment containing a fluid at a second pressure higher or lower than the first pressure in said environment, and the first environment and the second environment are separated by said sealing system on the rotating shaft, wherein a movable ring concentric with said rotating shaft placed between said wall of the stator part and the disk of the rotor part and provided with at least one annular sealing gasket facing towards a portion of said disk, and is provided, and wherein said ring is axially movable by control between an inactive rearward position, in which the sealing gasket is far from said disk, and a forward active position in which said sealing gasket rests on said disk, the movable ring being moved in said active position when the rotating machine is stationary to prevent the fluid passage from one of said environment to the other environment, wherein the movable ring is accommodated and guided in an annular recess obtained in the wall of the stator part in front of the disk of the rotor part and has a head portion with a throat carrying the annular sealing gasket facing towards the disk of the rotor part, and wherein the movable ring is associated with the annular recess with the interposition of sealing gaskets, and can be moved from the inactive rearward position to the forward active position by means of a pressurized fluid fed to said annular recess, and from the active position to the rearward inactive position by thrust springs operating between the movable ring and a fixed countercheck ring constrained to said wall of the stator part.