Commonly used non-contact seals are gap seal, swing oil seal ring seal and labyrinth seal of a variety of forms such as import bearing maintains a role and the structure characteristics. Since of gaps, in addition to the ring seal off oil, non-contact used for sealing grease lubrication occasion. To improve the reliability of the seal, use a combination of vatious types of seals.

Because of non-contact sealing device in the seal clearance, in addition to the existing internal friction of the lubricant, all won't appear any other friction, therefore, non-contact seal won't produce wear, use the time is long do not produce significant temperature rise, can be applied to a higher speed of the place. But seal clearance can not be too big, or sealed effect is poor.

Bearing a by parts of non-contact seal:

1. The clearance seal: simple structure, domestic and imported bearing of the old and new code bearing size parameters CRT (55) 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.

2. Groove seal: filling grease groove in after 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.

3. Labyrinth seal: when a maze song road after grease filling, sealing effect than the seal grooves. 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.

4. Oblique labyrinth seal: used for shaft deflection great, the song with the center cant road swing. Oblique labyrinth seal song way after filling grease can achieve better sealing effect.

5. Stamping pieces of steel labyrinth seal: by stamping pieces of steel of the synthesis of labyrinth seal, domestic and imported bearing of the old and new code bearing size parameters CRT (56) the stamping pieces of steel can be installed on the shaft with or shell, don't 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.

6. Jilt oil ring seal: steel room temperature phosphating technical superiority and application scope lubrication oil bearing FAG, on the shaft open groove, or put a ring, 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.



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