汽轮机技术
汽輪機技術
기륜궤기술
TURBINE TECHNOLOGY
2015年
2期
142-144,85
,共4页
低压转子%振动%轴承%低频%油膜涡动
低壓轉子%振動%軸承%低頻%油膜渦動
저압전자%진동%축승%저빈%유막와동
low pressure rotor%vibration%bearing%low frequency%oil film whirl
某型机组在高负荷时汽轮机低压转子发生了突发性振动现象,降低负荷振动缓慢降低,之后振动瞬间消失,振动持续了十几分钟;在中间负荷变润滑油温度试验过程中再次发生了类似突发性振动故障。振动频谱分析表明,故障轴承主频率是0.376×的低频分量,结合振动特性、机组结构特点、轴承钨金温度、油膜压力和降速过程轴心位置变化,诊断为油膜涡动。在轴承检查无异常的情况下,采取了增加轴承载荷的治理措施,消除了该机组的低频振动故障。
某型機組在高負荷時汽輪機低壓轉子髮生瞭突髮性振動現象,降低負荷振動緩慢降低,之後振動瞬間消失,振動持續瞭十幾分鐘;在中間負荷變潤滑油溫度試驗過程中再次髮生瞭類似突髮性振動故障。振動頻譜分析錶明,故障軸承主頻率是0.376×的低頻分量,結閤振動特性、機組結構特點、軸承鎢金溫度、油膜壓力和降速過程軸心位置變化,診斷為油膜渦動。在軸承檢查無異常的情況下,採取瞭增加軸承載荷的治理措施,消除瞭該機組的低頻振動故障。
모형궤조재고부하시기륜궤저압전자발생료돌발성진동현상,강저부하진동완만강저,지후진동순간소실,진동지속료십궤분종;재중간부하변윤활유온도시험과정중재차발생료유사돌발성진동고장。진동빈보분석표명,고장축승주빈솔시0.376×적저빈분량,결합진동특성、궤조결구특점、축승오금온도、유막압력화강속과정축심위치변화,진단위유막와동。재축승검사무이상적정황하,채취료증가축승재하적치리조시,소제료해궤조적저빈진동고장。
Sudden vibration phenomenon occur in steam turbine low pressure rotor at the high load condition .The vibration lasting for more than ten minutes disappeared instantly after the load was slowly decreased ,but the similar sudden vibration phenomenon occur on the changing lubricating test at the middle load condition .The analysis of vibration spectrum shows that bearing main frequency is 0.376 × low frequency component .Combining the with the characteristics of vibration characteristics, unit structure, bearing graphite metal temperature , oil film pressure and axis position change on the slow down the process ,the oil film whirl was diagnosed .The low frequency vibration fault was eliminated after increasing the bearing load when the bearing was examined without exception .