Patent ID: 8573939

Claim:
A shroud for the rotating blades of a turbo machine wherein a shroud ( 10 ) is arranged along the circumference of a row of several rotating blades ( 14 , 50 ) disposed on a rotor ( 12 ) and has at least one separation gap ( 16 , 16 ′, 16 ″) along its circumference, the at least one separation gap ( 16 , 16 ′, 16 ″) is formed in zigzag shape and has at least two damping gaps ( 20 , 22 , 24 , 26 , 28 ) which are distanced from one another and extend at an angle to an axis of rotation ( 18 ) of rotor ( 12 ), and adjacent thereto, one of the damping gaps ( 28 ) running at an acute angle to remaining damping gaps ( 20 , 22 , 24 , 26 ) which are aligned at an angle of 60° to 90° relative to the axis of rotation ( 18 ) of rotor ( 12 ), has connection gaps ( 30 , 32 , 34 , 36 , 38 , 40 ), each connecting damping gaps ( 20 , 22 , 24 , 26 , 28 ) or extending them in the direction of the edges of the shroud ( 54 , 56 ), is hereby characterized in that, when rotor ( 12 ) rotates, the gap width of damping gaps ( 20 , 22 , 24 , 26 , 28 ) is reduced until the gap walls ( 42 , 44 ) forming the damping gaps ( 20 , 22 , 24 , 26 , 28 ) come to rest against each other.