美国的电站汽轮机,其高压转子和中压转子都采用整锻式转子,低压转子则因外形尺寸大而经常采用套装式叶轮结构。套装式叶轮的内孔和主轴上开有键槽,叶轮与主轴之间依靠键来联接。套装式叶轮经过长期运行后经常会发生 US power station steam turbine, the high-pressure rotor and medium-pressure rotors are used forging forging rotor, low-pressure rotor due to large size and often use the package impeller structure. Set the impeller hole and the main shaft opened a keyway between the impeller and the spindle by the key to connect. Set-type impeller often occurs after long-term operation