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非接触式密封形式的种类

(2009-04-21 09:03:35)
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非接触式

杂谈

    常用的非接触式密封形式有如下三种。
  1、隙缝密封。最简单的结构形式是在轴和轴承盖的通孔之间留出半径间隙约为0.1~0.3mm的隙缝。这对使用脂润滑的轴承具有一定的密封效果。在轴承盖的通孔内车出环形槽,槽中填充润滑脂,可以提高密封的效果。
  2、迷宫式密封。迷宫是指由旋转的和固定的密封件之间构成的隙缝是曲折的。通常迷宫沿径向布置,隙缝最小取为0.2~0.5mm。隙缝中常填入润滑脂。
迷宫式密封用于脂润滑和油润滑都有效。特别是当环境比较脏和潮湿时,应用迷宫式密封是相当可靠的。
  3、甩油环密封。在轴上开出沟槽或装上油环,借离心力将沿轴表面外流的油甩掉,集结后流回油池,因而起到密封的作用。但是,停车后便失去密封效果,故常和其他形式的密封联合使用。轴承内侧装设的甩油盘就是借离心作用将可能进入轴承内部的油甩掉,起到密封的作用。
  在重要的机器中,为了获得可靠的密封效果,常将多种密封形式合理地组合使用,如迷宫式加隙缝式的组合等。

Commonly used non-contact form of the following three types of seals.
1, sealing gaps. The structure of the simplest form of shaft and bearing caps in the through-hole gap between the left radius of about 0.1 ~ 0.3mm gaps. This use of grease lubrication of the bearing has a sealing effect. Bearing caps in the car out of the pass-hole annular trough, grease-filled tank, can improve the sealing effect.
2, the labyrinth seal. Maze is the rotating and fixed by the seal of the gaps between the composition is tortuous. Along the radial maze is usually arranged from the smallest aperture for 0.2 ~ 0.5mm. Often fill in gaps grease.
Labyrinth seal for grease lubrication and oil lubrication are valid. Especially when the environment is dirty and wet, the application of the labyrinth seal is very reliable.
3, seal off the oil. Out in the shaft loaded oil ring groove or by centrifugal force along the axis of the oil drain off the surface, the oil flows back to the assembly after the pool, and thus play a role in sealing. However, after stopping the loss of sealing effect,故常and other forms of sealing the joint use. Bearing off the inside of oil pan installed by the centrifugal effect is likely to enter the oil off the internal bearings, seals play a role.
In the important machinery in order to obtain reliable sealing effect of sealing the form of a variety of often used in combination with a reasonable, such as the increase of the maze-like composition of gaps.
非接触式密封形式的种类非接触式密封形式的种类

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