Non-contact seal bearing commonly used form have three: aperture ring seal oil seal, swing and labyrinth seal. Since there are gaps, in addition to the ring seal off oil, non-contact used for sealing grease lubrication occasion. To improve the reliability of the seal, all kinds of seal can be used together.

Non-contact sealing device has the following a few advantages: seal clearance except exist in the internal friction of the lubricant won't have other friction, therefore, non-contact seal won't produce wear; Using the time is long do not produce significant temperature rise; Can be used in place of high speed. But seal clearance can not be too big, or sealed effect is poor.

Bearing support parts of non-contact seal include:

Clearance seal. It is simple in structure, can satisfy the general conditions of the sealing requirements. The choice of clearance e d than 50 mm, e = 0.25 ~ 0.40 mm; D > 50 mm, e = 0.25 ~ 0.6 mm.

Groove seal. After filling grease groove in the dust is difficult to invade, have ring grooves and spiral groove two forms. Ring slot usually have a three. Slot width b = 3 ~ 5 mm; Groove depth t = 4 ~ 5 mm.

Labyrinth seal. When a maze song road after grease filling sealing effect than groove seal. Labyrinth seal can be divided into radial and axial two forms. Radial and axial clearance choice: d than 50 mm, a = 0.20 ~ 0.30 mm, b = 1.0 ~ 1.5 mm; D = 50 ~ 200 mm, a = 0.30 ~ 0.50 mm, b = 1.5 ~ 2.0 mm.

Oblique labyrinth seal. It is used for shaft deflection bigger when music road with the center cant swinging. Oblique labyrinth seal song way after filling grease can achieve better sealing effect.

Ring seal off oil. Oil lubrication, opened on the shaft with a ring groove or, can take to the loss of the oil to the along the radial throw, through the bearing on the cover oil chamber and oil KongLiu set back to the oil pool. Also can be in close to bearing installed in place a ring off oil, the structure and often use a combination of sealing aperture.

 
Stamping pieces of steel labyrinth seal. By stamping pieces of steel of the synthesis of labyrinth seal, the stamping pieces of steel can rely on installed in shaft or shell with, do not need to tighten axis, the structure is simple. If in stamping pieces of steel maze of the song the way of grease filling, and has a good sealing effect.



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