论文部分内容阅读
三油楔轴承是近代大型汽轮机组中采用的一种轴承型式。三油楔轴承与普通轴承,或单油楔向承不同。从润滑油膜的压力分布图上可以明显地看出,三油楔轴承具有三个楔形的圓弧段,并组成一个正圆。每个油楔中润滑油通道内的合成油压在轴上产生一个力,使轴能平稳地旋转,减少振动。三油楔轴承在运行性能上有两个特点:(1)抗振性能良好,运行稳定。由于旋转方向和轴承受的负荷大小是不同的,因此三油楔轴承的三个压力油膜就有三个不同长度。这就增加了轴颈在负荷小时的稳定性。此外,在任何负荷下,三油楔轴承中轴颈的偏心度都是非常小的。试验证明,在轴承座振幅相同的条件下,三油楔轴承轴颈在轴瓦中的偏心度比普通轴承小得多,三油楔轴承的油膜刚度一般要比单油楔轴承高1～5倍;(2)能够承受较大的表面负荷。三油楔轴承的表面承载负荷可达30kgf/cm~2以上,这就
Three oil wedge bearing is a type of bearing used in modern large steam turbine. Three oil wedge bearings and ordinary bearings, or a single wedge bearing different. It is evident from the pressure profile of the lubricant film that the three oil wedge bearing has three wedge-shaped circular segments and forms a perfect circle. The resultant oil pressure in the oil passage in each wedge creates a force on the shaft that allows the shaft to rotate smoothly and reduce vibration. Three oil wedge bearing performance in the operation of two characteristics: (1) good vibration performance, stable operation. As the direction of rotation and bearing the load is subject to the size of the three oil wedge bearing three pressure oil film there are three different lengths. This increases the stability of the journal in hours of load. In addition, the eccentricity of the journal in the triple wedge bearing is very small at any load. Tests show that the bearing amplitude at the same conditions, three oil wedge bearing journal eccentricity in the bearing is much smaller than the average bearing, oil wedge bearing oil film stiffness is generally 1 to 5 times higher than a single wedge bearing ; (2) able to withstand a large surface load. Three oil wedge bearing surface load up to 30kgf / cm ~ 2 above, which