Framework Oil Seal Material And Speed/temperature
Nov 24, 2022
The process flow is different from that of rubber, so it is necessary to consider which production process to use to make skeleton oil seals. Although many mainstream rubber can be used to make skeleton oil seals (such as NBR, acrylic acid, fluororubber, silicone rubber, etc.), the following points should be followed when selecting:
1. Maximum actual temperature of the working environment.
It is the operating ambient temperature of the framework oil seal
2. Minimum operating temperature.
When the temperature is low, the rubber will become hard and brittle, and the resilience will become smaller. The holding force of the oil seal lip to the shaft center will increase, increasing friction. However, after the shaft rotates, the lip of the skeleton oil seal will gradually return to its original elasticity due to the increased friction due to the increased holding force. Therefore, the skeleton oil seal can still operate normally under the condition of low brittle rubber temperature or forced lower temperature, provided that the shaft speed is high.
3. The influence of shaft speed on the framework oil seal material.
Shaft speed is an important factor for the selection of framework oil seal material, because too high shaft speed will generate heat by friction with the lip. When the shaft speed is too fast and the temperature is too high, the following ability of the oil seal to the shaft will be reduced, and the second is that too high temperature will accelerate the aging of the rubber lip and shorten the service life of the framework oil seal.
4. Select the oil seal material according to the sealing medium.
Different oil seal materials shall be selected for sealing different mediums to prevent contamination and burning of the medium caused by the components of rubber and corrosion of the medium to the oil seal materials.
5. Select the skeleton oil seal material according to the working state.
Oil seals can be divided into reciprocating oil seals and rotary skeleton oil seals according to their working conditions. Rotary oil seals are generally used in mechanical shaft seals, and reciprocating oil seals are generally used in rod seals. Different sealing methods have different materials.
