| 摘要 |
PURPOSE:To reduce an amount of steam leakage by forming each seal ring into a shape of channel-section and alternately arranging grooves of channel- section opposed to an expansion joint, etc., when the expansion joint is installed in a steam introducing section leading to a nozzle box, and the seal rings are provided on an outer periphery of the expansion joint. CONSTITUTION:In a turbine steam introducing device, an expansion joint 7 extends through outer and inner casings 2, 3, and its one end is connected to a steam introducing section 6 and other end is connected to the wall of a nozzle box 5. And corrosion proof parts 10 are laid on the side wall of the expansion joint 7 opposed to the bulkheads of both casings 2, 3 and the nozzle box 5, and sealing devices are provided in facing the corrosion proof parts 10. In this case, for these sealing devices, inner seal rings 8b and outer seal rings 8a formed into a shape of channel-section are arranged so that grooves 11 of respective rings are alternately opposed to the expansion joint 7-side and the casing 2, 3-sides.
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