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旋转轴回流油封,在国外从60年代开始试验研究以来,到70年代初已开始扩大应用,利用流体力学作用把泄漏的油自行回流,从而提高了轴的密封效果和使用寿命,这是近年来旋转密封结构设计的一个新发展。目前回流作用的花纹形式,在国内外已经设计出很多种,有些已经进行了工业化生产。回流油封主要有两大类:(1)单向回流油封,例如斜筋(丝扣)油封、单头螺纹回流油封、多头螺纹回流油封(如SG 油封)等;(2)双向回流油封,例如DP 油封、凸三角块双向回流封、凹三角块
Rotary axis of the oil seal back in the foreign experiment and study from the 60’s to the early 70s has begun to expand the application of the use of fluid mechanics to leak the oil back to their own, thereby enhancing the shaft sealing effect and service life, which is in recent years A new development of rotary seal design. At present, the pattern of the effect of backflow has been designed in a variety of ways both at home and abroad, and some of them have been industrially produced. There are two main types of return oil seal: (1) one-way return oil seal, such as diagonal (threaded) oil seal, single-headed thread return seal, multi-head thread return seal DP oil seal, convex triangle block two-way backflow seal, concave triangular block