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Commonly used non-contact seals are gap seals, oil-slip ring seals, and labyrinth seals. Due to the presence of gaps, non-contact seals are used in grease lubrication applications, in addition to the oil ring seals. In order to improve the reliability of the seal, various types of seals can be used in combination.
Since the non-contact sealing device seal gap, in addition to the internal friction of the lubricant, there will be no other friction, therefore, the non-contact seal will not wear, the use of a long time will not produce significant Temperature rise can be applied to places with higher rotational speeds. However, the gap of the seal must not be too large, otherwise the effect of the seal is extremely poor.
Non-contact sealing 3M tape for bearing support area:
1. Gap seal: simple structure, can meet the sealing requirements under normal conditions. The choice of gap e is d≤50 mm, e=0.25 to 0.40 mm, d>50 mm, and e=0.25 to 0.6 mm.
2. Groove Sealing: Dust is hard to invade after filled with grease in the groove. There are two types of groove and spiral groove. There are 3 ring grooves in general. Groove width b = 3 ~ 5mm; groove depth t = 4 ~ 5mm.
3. Labyrinth seal: When the labyrinth curve is filled with grease, its sealing effect is better than that of the groove seal. Labyrinth seals can be divided into radial and axial forms. Radial and axial clearance options: d ≤ 50 mm, a = 0.20 to 0.30 mm, b = 1.0 to 1.5 mm; d = 50 to 200 mm, a = 0.30 to 0.50 mm, and b = 1.5 to 2.0 mm.
4. Oblique labyrinth seal: When the shaft deflection is large, the curve slope can swing with the center. Oblique labyrinth seal filled with grease can achieve a better sealing effect.
5. Laminated steel labyrinth seals: A composite labyrinth seal consisting of stamped steel sheets. The stamped steel sheet can be mounted on the shaft or housing by means of a fit. No axial fastening is required and the structure is simple. If filled with grease in the labyrinth of the stamped steel labyrinth, it has a better sealing effect.
6. Oil Retaining Ring Seal: When oil is lubricated, open grooves in the shaft, or install a ring, you can throw the oil you want to drain outwards in the radial direction, through the oil collection chamber and the oil hole on the bearing cover. Return to the oil pool. It is also possible to fit an oil ring around the bearing. This structure is often used in conjunction with a gap seal.
In the above, we have explained and introduced the application technologies of some bearings. We have described in detail the non-contact sealing technology of such bearings, and have carried out detailed practical application examples of some of its parameters. The collation and explanation of these knowledge, I hope you can understand, in later related applications can be a reference.
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Bearings are well-applied in many machines. In the past, our carts used bearings in our bicycles. Nowadays, in the various types of machinery such as automobiles and cranes, there are many applications for bearings. Of course, the application of bearings is not all the same. The specific machinery, its bearings are not the same. Below we introduce a commonly used bearing technology.