燃气轮机转子分布式拉杆螺栓螺纹受载和松动特性

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中图分类号：TK474.72；TB115.1 文献标志码：B

Load and loosening characteristics of distributed tension rod bolt thread in gas turbine rotor

YU Peijiong ，DENG Zhe'’2，WEI Jiaming ZHAN Changgeng1，2 ， ZHU Huayun

（1.Zhejiang Rancon Turbine Machinery Co.，Ltd.，Hangzhou 31Oo58，China； 2.Hangzhou Steam Turbine Power Group Co.，Ltd.，Hangzhou 31OO22，China）

Abstract：As to the uneven load distribution and loosening characteristics of distributed tension rod bolts for gas turbine rotors，the thread load distributions of the tension rod bolts in four forms are studied， which are the metric thread，the internal cone thread，the metric thread with unloading groove，and the internal cone thread with unloading groove.The load distribution characteristics of each thread tooth is analyzed.The results indicate that the load distribution of the internal cone thread with unloading groove is the most uniform. Regarding the load characteristics of gas turbine rotors during operation，the loosening processes of the tension rod nuts under various load factors are simulated using finite element quasi-static method，and the preload force variation and the maximum slips of the first thread under different loads are studied. The results show that： the bending moment of the rotor willnot cause the nut loosen，and the accumulation of multiple short circuit torques leads to a significant reduction in the preload force，and then under the continuous action of lateral loads，the pre-load force slowly decreases，and the tension rod nut becomes loose；under three diffrent loads，the reduction in pre-load force of the internal cone thread with unloading groove is the smallest.

Key words：tension rod bolt； load distribution； loosening；pre-load； finite element

0 引言

燃气轮机是一种高温、高压燃气推动的旋转机械，具有快速启停、高效、安全等特点。（剩余6062字）