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一、叶轮损坏情况江苏戚墅堰发电厂9号机(B12-90/37型)系广州汽轮机厂试制的单级背压汽轮机,功率12000千瓦。该机于八一年四月廿二日突然发生剧烈振动,紧急停机。吊缸揭盖检查,发现叶轮的轮缘连同七只叶片从内铆孔处断裂飞落,裂口长约150mm。叶轮工作温度为450～460℃,共计运行1559小时,启停机24次。损坏部位及飞裂的叶轮见图1。叶轮轮缘部分的详细尺寸见图2。
First, the impeller damage Jiangsu Qishuyan Power Plant No. 9 (B12-90 / 37) Department of Guangzhou Steam Turbine trial production of single-stage back pressure steam turbine, power 12,000 kilowatts. The aircraft suddenly violent vibration on April 22, 1981, emergency shutdown. Gland cylinder cover inspection and found that the impeller rim together with the seven leaves from the riveting hole at the fracture fission, rift length of about 150mm. Impeller working temperature 450 ~ 460 ℃, a total of 1559 hours of operation, start and stop 24 times. Damaged parts and fly-split impeller shown in Figure 1. The detailed dimensions of the impeller rim section are shown in Figure 2.