A turbomachine, especially a steam turbine ( 10 ), has an inner casing ( 15 a ) and an outer casing ( 17 a ), which concentrically encompass a rotor which is rotatable around a machine axis, wherein the outer casing ( 17 a ) encloses the inner casing ( 15 a ) with a radial space (d), and at least the inner casing ( 15 a ) is divided in a parting plane ( 22 ) into two casing halves ( 15 a ) which can be releasably interconnected by flanges ( 18 ) which are attached to the casing halves ( 15 a ), and wherein the casing halves ( 15 a ) of the inner casing ( 15 a ) have a thickening ( 20 ) in the region between the flanges ( 18 ). A change of the interspace between the casings is largely avoided by the outer casing ( 17 a ), in the region of the thickening ( 20 ) of the inner casing ( 15 a ), being adapted to the thickening ( 20 ) so that the radial space (d) between inner casing ( 15 a ) and outer casing ( 17 a ) outside the flanges ( 18, 19 ) is largely constant over the casing circumference.
1. A turbomachine comprising:
a rotor rotatable around a machine axis;
an inner casing which concentrically encompasses the rotor;
an outer casing which concentrically encompasses the inner casing;
wherein the outer casing encloses the inner casing at a radial space d, and at least the inner casing is divided at a parting plane into two casing halves configured and arranged to be releasably interconnected by, and including, flanges attached to the casing halves, and wherein the casing halves of the inner casing have a thickening in the region between the flanges;
wherein the outer casing, in the region of the thickening of the inner casing, is adapted to the thickening so that the radial space d outside the flanges is constant over the casing circumference.
2. The turbomachine as claimed in claim 1 , wherein the outer casing, for adapting to the thickening of the inner casing, has a corresponding deformation in the region of the thickening.
3. The turbomachine as claimed in claim 1 , wherein the wall thickness of the outer casing in the region of the deformation is constant.
4. The turbomachine as claimed in claim 1 , wherein the thickening is formed symmetrically to a center plane which is perpendicular to the parting plane.
5. The turbomachine as claimed in claim 4 , wherein the thickening comprises a uniform increase and decrease of the wall thickness of the inner casing in the circumferential direction.