| 摘要 |
PURPOSE:To reduce leakage loss by relieving the cutting edge part of an axially high pressure side rove end face of a rotor toward the axially low pressure side, greater than a tooth trough part, and also by relieving the rove cut acute side surface of the end face toward the axial low pressure side, greater than the obtuse side surface. CONSTITUTION:A rotor 1 has high and low pressure side shafts 2, 3, and further a rove 6 wound on the rotor 1 has high and low pressure end faces 4, 6. In this arrangement, the rotor 1 has the high pressure side end face 4 which is relieved with respect to a plane 30 orthogonal to the axis of the rotor, toward the low pressure side end face 5. Also, the nearer to the cutting edge, the greater the degree of the relieving is With this arrangement, when the temperature of the rotor 1 increases during operation, since the shape of the high pressure side end face 4 comes to have a nearly flat surface so as to give no loss in the gap between the high pressure side end face 4 and the inner wall of a casing, leakage loss is restrained to a minimum value so as to enhance the reliability. Further, it is possible to prevent the rotor 1 and the casing from contacting each other.
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