Clearance control system, turbomachine and method for adjusting a running clearance between a rotor and a casing of a turbomachine

A method for adjusting a running clearance (L) between a rotor (12) having rotor blades (10) of a turbomachine (14) and a casing (18) that surrounds at least sections thereof, comprising at least two segments (16a-d), comprising the steps of:

• determining a magnitude (Δr) of the running clearance (L) between the rotor (12) and the segments (16a-d) of the casing by means of at least one sensor device (26a-d) and transmission of the magnitude (Δr) to a regulating unit (30);
• regulating at least one actuator (28a-d) by means of the regulating unit (30) depending on the determined magnitude (Δr) of the running clearance (L);
• providing an adjusting element (22) arranged around the rotor (12), wherein the adjusting element (22) is designed at least substantially as a ring and is formed from at least one ring subsection;
• causing the at least one actuator (28a-d) to effect relative axial movement of the adjusting element (22) at actuator positions along the adjusting element (22) to cause the adjusting element to be at least one of:
• axially shifted in relation to a rotational axis (D) of the rotor (12) and spatially pivoted in relation to the rotational axis (D) of the rotor (12);
• actuating at least one adjusting gear unit (20) by means of the adjusting element (22);
• and
• radially moving, in relation to the rotational axis (D) of the rotor (12), at least one segment (16a-d) of the casing (18) by means of the at least one adjusting gear unit (20), thereby adjusting the running clearance (L).

A clearance control system for adjusting a running clearance (L) between a rotor (12) having rotor blades (10) of a turbomachine (14) and a casing (18) that surrounds at least sections thereof and comprises at least two segments (16a-d), comprising:

• at least one adjusting gear unit (20), which is coupled to at least one segment (16a-d) of the casing (18) and by means of which the at least one segment (16a-d) for adjusting the running clearance (L) are moveable radially in relation to a rotational axis (D) of the rotor (12), the running clearance (L) being defined between the rotor (12) and the segments (16a-d) of the casing;
• and
• an adjusting element (22) that can be arranged around the rotor (12) and which is coupled to the at least one adjusting gear unit (20) and can be moved in relation to it for actuating the adjusting gear unit (20),
• wherein the adjusting element (22) can be moved axially in relation to the rotational axis (D) of the rotor (12) at actuator positions along the adjusting element (22) to cause the adjusting element to be at least one of:
• axially shifted with respect to the rotor (12) and spatially pivoted with respect to the rotor, and the at least one adjusting gear unit (20) is designed in order to transform an at least predominantly axial movement of the adjusting element (22) at the actuator positions into an at least predominantly radial movement of the assigned segment (16a-d) of the casing (18), so that the running clearance (L) is adjusted due to the coupling of the adjusting element (22) to the at least one adjusting gear unit (20) and the coupling of the at least one adjusting gear unit (20) to the at least one segment (16a-d) of the casing (18),
• wherein the at least one adjusting gear unit (20) comprises a tension bolt (31) coupled to at least one segment (16a, 16b) and a pressure bolt (80) coupled to at least one segment (16a, 16b), with the tension bolt (31) and the pressure bolt (80) being movable relative to one another and being force-loaded against one another.

A clearance control system for adjusting a running clearance (L) between a rotor (12) having rotor blades (10) of a turbomachine (14) and a casing (18) that surrounds at least sections thereof and comprises at least two segments (16a-d), comprising:

• at least one adjusting gear unit (20), which is coupled to at least one segment (16a-d) of the casing (18) and by means of which the at least one segment (16a-d) for adjusting the running clearance (L) are moveable radially in relation to a rotational axis (D) of the rotor (12), the running clearance (L) being defined between the rotor (12) and the segments (16a-d) of the casing;
• and
• an adjusting element (22) that can be arranged around the rotor (12) and which is coupled to the at least one adjusting gear unit (20) and can be moved in relation to it for actuating the adjusting gear unit (20),
• wherein the adjusting element (22) can be moved axially in relation to the rotational axis (D) of the rotor (12) at actuator positions along the adjusting element (22) to cause the adjusting element to be at least one of:
• axially shifted with respect to the rotor (12) and spatially pivoted with respect to the rotor, and the at least one adjusting gear unit (20) is designed in order to transform an at least predominantly axial movement of the adjusting element (22) at the actuator positions into an at least predominantly radial movement of the assigned segment (16a-d) of the casing (18), so that the running clearance (L) is adjusted due to the coupling of the adjusting element (22) to the at least one adjusting gear unit (20) and the coupling of the at least one adjusting gear unit (20) to the at least one segment (16a-d) of the casing (18),
• wherein at least one adjusting gear unit (20) comprises at least one of:
• an actuating lever (66) coupled to the adjusting element (22);
• a thread (58) and a thrust bearing (60);
• a spindle drive;
• a spring element (54);
• a tension bolt (31) that is coupled to at least one segment (16a-d) of the casing (18);
• and a catch mechanism, and
• wherein the at least one adjusting gear unit further comprises:
• a camshaft (46).