| 摘要 |
PROBLEM TO BE SOLVED: To provide a steam turbine casing wherein contact and damage with/to a static part and a rotation part of the steam turbine are prevented, by reducing a difference of temperature between the metal of the upper and lower outer casings in stopping the steam turbine after running it, and by preventing thermal deformation of the upper outer casing. SOLUTION: This steam turbine casing, which has a rotor in it and in which the upper and lower outer casings are fastened at mutual horizontal flange jointing surfaces, is formed of a cooling air hole provided at the upper outside casing, opened to the inner surface of the upper outer casing, and a cooling air pipe connected to the cooling air hole and supplying cooling air from a cooling air supply source to a space facing the inner surface of the upper outer casing via the valve. As a result, by cooling the inner surface of the upper outer casing with the cooling air, cost increases and extension of a stopping period are avoided, and the metal temperature difference between the upper and lower outer casings is efficiently reduced in stopping the steam turbine after running it, and the thermal deformation to the steam turbine casing is also prevented. COPYRIGHT: (C)2003,JPO
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