Compared with other sealing devices, felt oil seals have the following advantages:
The structure is simple and easy to manufacture. A simple oil seal can be molded at one time, even if the most complex seal is not complicated. Metal skeleton oil seal also only needs to go through stamping, gluing, inlaying, molding and other processes, then the metal and rubber composition of the required oil seal.
Light weight and less material consumption. Each kind of oil seal is thin metal parts and rubber parts of the combination, its material consumption is very little, so each oil seal weight is very light.
The installation position of the oil seal is small, the axial dimension is small, and the machine is easy to process, and the machine is compact.
Good sealing performance and long service life. The vibration of the machine and the eccentricity of the spindle have certain adaptability.
Easy disassembly and easy maintenance. The price is cheap. The disadvantage of oil seal is that it can not bear high pressure, so it can only be used as the seal of bearing oil.
The scope of work as follows: felt seal pressure ~ 0.3MPa sealing surface line speed low speed <4m/s, high speed of 4 ~ 15m/s -60 operating temperature to 150 DEG C (with rubber types) for oil and water and weak corrosive liquid design life of 500 ~ 2000h.
The working principle of wool felt oil seal gasket, there is a very thin adhesion oil film between the surface of the felt seal and the contact surface between the shaft and the shaft. This layer of oil film, on the one hand, can play the role of sealing fluid medium, on the other hand, can also play the role of lubrication between the lip and shaft. But in the process of using the oil seal, oil seal lip effect, different axial surface and rotation and fluid sealing properties, interaction and mutual cooperation as well as the three conditions are often changed, so the seal dynamic is fluid lubrication, boundary lubrication and dry friction lubrication 3 sec alternate coexistence the case, which is the main fluid lubrication. Therefore, a good seal can be achieved in the proper range of the oil film thickness.
Skeleton oil seal, that is, lubricating oil seal. It is used in all kinds of mechanical bearings, especially rolling bearing parts. Its function is to put the oil cavity and the isolation of sealed oil, external dust. The difference between felt and other lip seals is that the lip with greater resilience has a very narrow width (about 0.5mm) and the distribution pattern of contact stress is pointed. Sketch of typical structure of oil seal and contact stress of lip. The section shape of the felt oil seal and the tightening spring make the lip mouth have better following compensation for the shaft. Therefore, the felt seal can achieve better sealing effect with smaller lip diameter.