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| Performance analysis and design improvement of thrust bearing bush in a large vertical pump unit |
| Sun Mingquan1,Qiu Baoyun2,Kan Yonggeng1 |
| (1.Jiangdu Administration Bureau of Hydraulic Engineering,Jiangdu,Jiangsu 225200,China;2.College of Hydraulic Engineering,Yangzhou University,Yangzhou,Jiangsu 225009,China) |
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Abstract The performance of the thrust bearing bush of the main motor in a large vertical pump unit was studied,and the cause of burnout malfunction of the main motor thrust bush in No.4 Pumping Station of Jiangdu Hydro-junction was analyzed.A thrust bearing bush with elastically metallic plastics as a substitute for babbit alloy was used for the structure imrovement in the main motor.According to the application of the elastically metallic plastic thrust bush,and by comparison with the babbit thrust bush,the special attention for the application of the elastically metallic plastic thrust bush was introduced.Through 20 000 hours safe operation,wear extent of the plastic bush was less than 0.05 mm.At the same time,the main pump unit operated steadily;its plastic bush temperature was held at about 30 ℃ and its cooling water temperature kept around 20 ℃.Therefore,the design improvement adopting the plastic bush could ultimately decrease the probability of the burnout trouble.
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Received: 26 February 2009
Published: 30 March 2009
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