Arrangement of a segmented retractable seal in a stator of a turbine

摘要

The invention relates to an arrangement of segmented retractable rotor seals (4) in a stator (2) of a turbine by which the rotor seals are arranged radially and axially movably in a groove (1) formed in the stator and are connected with means which retracts the seals away from the rotor (3) of the turbine in a radial direction. The groove (1) formed in the stator contains an outer partial groove (11) formed on the inner surface of the stator and an inner partial groove (12) formed in the body (2) of the stator and connected with it, whereby each rotor seal contains a head (41), which is arranged in the inner partial groove and a comb (42), which is arranged in the outer partial groove (11), wherein the head and the comb are connected by a neck (43), and the smallest clearance (V) along the entire height of the arrangement of the rotor seals is formed in the direction of movement of sealed medium between the downstream face (421) of the comb and the wall of the outer partial groove facing it, whereby the upstream space in front of the rotor seal and the space closed between the radially upper surface of the comb and the stator on the opposite side of the rotor seal are connected by at least one connecting hole (430) created in the neck (43) of the seal and/or at least one hole/slit (44) created in the stator on each side of the inner partial groove and connected with it.