Bearing box floating labyrinth oil seal

Source: China Bearing Network Time: 2013-01-18

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The labyrinth seal is between the shaft and the casing; a combination of a plurality of concavo-convex annular seal teeth with small clearances arranged in sequence; a series of savings between the seal teeth and the shaft to save play and swell cavity; splash lubrication Each pass of a sealing tooth; a large resistance will be encountered; then a saving effect occurs; the speed of the lubricant is continuously weakened; the weakened lubricant flows down the inside of the sealing tooth to the lower part of the annular cavity; After returning to the bearing chamber through the oil return hole in the lower part of the annular cavity; reaching the role of avoiding leakage of the lubricant. Commonly used labyrinth seals usually have radial seals, axial seals, floating seals and composite seals; Uniquely designed to avoid lubricant leakage from high speed shafts.
It can be imagined that if the number of sealing teeth is sufficient, then no matter how fast the lubricant splashes, it can achieve a complete sealing effect; but in fact; the number of sealing teeth is intended to be added; the axial dimension is increased; thus; too much It is very difficult to add sealing teeth on the equipment. In order to improve the sealing effect of the labyrinth seal, in principle, the smaller the gap between the sealing teeth and the shaft is, the better.
The causes of oil leakage are: the seal teeth of the labyrinth seal are severely worn or damaged, the oil level in the bearing chamber is high, the clearance between the labyrinth oil seal and the shaft is too large, the seal on the opposite side of the oil seal and the bearing chamber is not strict, when the device is installed; The orientation of the hole is incorrect or blocked.

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