大型低速重载径向动压轴承研究

为了开发大型贯流式水轮发电机组径向轴承,在试验台上采用了360的模型轴承对1740可倾6瓦块原型轴承进行模拟试验研究,最高试验比压3.37 MPa、最低线速度3.77 m/s、最高线速度22.62 m/s。试验表明:载荷、进油压力、转速、进油温度和安装间隙比等,对轴承油温升、油流量、功耗、瓦温及油膜厚度等都存在不同程度的影响,其中载荷和转速的影响比较显著。按照模型轴承指导设计的红岩子机组1740轴承已在电站可靠运行,同时开发了径向轴承热弹流计算程序,可以预测径向轴承的油膜压力、油膜温度、油膜厚度、损耗、流量等参数。

RESEARCH ON LARGE HYDRODYNAMIC JOURNAL BEARINGSAT THE LOW SPEED AND HEAVY DUTY CONDITION

For developing large type of journal bearings of tubular hydro-generator set, the simulating test of the diameter 1740 mm tilting pad bearings with the diameter 360 mm model bearings were preceded. The maximum testing average pressure is 3.37 MPa. The minimum journal velocity is 3.77 m/s. The maximum journal velocity is 22.62 m/s. Experiment indicated that load and inlet oil pressure and speed and inlet oil temperature and preload factor influenced oil temperature rise and oil flow and dissipation and pad temperature and oil-film thickness at different degree. Among them, the influence of load and speed was remarkable. The journal bearings of the diameter 1740 mm are working dependably at HongYanzi water power plant. At the same time, the software for computing the thermo-elastic-hydrodynamic (TEHD) lubrication performance of journal bearings was developed to estimate oil-film pressure and oil-film temperature and oil-film thickness and dissipation and oil flow etc.