Main factors affecting the choice of oil seal in China

In order to full play the function of oil seal, it is necessary according to the using conditions of the selected the most suitable model and data. Here is the main influence factors for a brief. Linear speed: 1, the shaft surface in under the condition of constant diameter, different materials manufacture of oil seal, with axial plane rotation speed can be different, their relationship as shown in the figure below. Oil seal use linear velocity range average less than 15 m/s, allow the appearance of the axis of the linear velocity is given in the figure below is a reference value, gratified is smooth and good heat dissipation conditions is the resolution factor. Corresponding lower data for more stringent conditions. 2, temperature: due to the rotation axis with seal sealing lips friction, so the sealing lip mouth temperature higher than the temperature of the oil, general oil seal work its rim lip temperature higher than the working medium temperature of 20 ~ 50 ℃. With higher speed, the pressure increase the temperature of the sealing lip also will rise. In addition, with dustproof lip seal, than without dustproof lip seal will present the high temperature above 20 ℃. When beyond the allowed temperature will shorten the working life of the oil seal, forming the sealing lip premature hardening for sex, as well as wear and tear. Oil seal work temperature range is associated with the data of oil seal used: data for nitrile butadiene rubber ( NBR） For - Rubber (40 ~ 120 ℃, Alec ACM) - 30 ~ 180 ℃, fluorine rubber ( FPM) - - - - - - 25~300℃。 3, pressure, oil seal is mainly used for non pressure or under the condition of micro pressure is applied, the maximum working pressure of 0. 02 ~ 0. 05Mpa。 When the pressure of work beyond this value should be chosen type pressure seal. 4, dustproof: in order to avoid contamination, dust, and moisture from the air side into the sealed cavity in the body, such as initiative with dustproof lip seal. If pollutants into serious initiative USES two oil seal, tandem devices in series way.