DG270 140C型给水泵泵轴与叶轮为间隙配合,转子刚度低,造成泵组在不到一个大修周期便出现轴瓦振动超标,同时由平衡盘后的轴套承受轴向推力,轴套摩擦后易变形,造成平衡盘平衡轴向推力作用失效。转子热装改造及平衡盘增设螺母后可增强转子刚度,提高设备安全等级。 DG270 140C type feed pump pump shaft and impeller for the gap with the rotor stiffness is low, causing the pump group in less than a cycle over there will be excessive bearing vibration, at the same time by the balance after the axial bearing sleeve to withstand axial friction after the sleeve easy Deformation, resulting in balanced disc balance axial thrust failure. Rotor rebuild and balance plate additional nuts can enhance rotor stiffness and improve equipment safety rating.