Oil seals are the customary appellation of general seals, as the name suggests: Oil seals are used to seal oil (oil is the most common liquid substance in the transmission system, but also refers to the general liquid substance) of the mechanical components. From the seal of oil seals, characteristics, structure types, working conditions and sealing mechanism can be divided into many forms and different names, but the usual rotary shaft lip seal ring is called oil seals, static seals and dynamic seals (general reciprocating movement) sealed parts called seals. Generally, the definition of seals is not very meaningful. More attention is paid to the actual application of oil seals and to solve the role of leakage in the sealing device.
Oil seals generally with oil-resistant rubber molded, Oil Seals nitrile rubber for the current oil seals and O-ring one of the most commonly used. Can be said to be the most widely used, the lowest cost of rubber seals. The most commonly used manufacturing oil seals are polyacrylate rubber, silicone rubber, fluorine rubber and PTFE.
Oil seals can be divided into many forms and different names according to sealing function, characteristics, structure type, working state and sealing mechanism. Oil seals according to the axis of the rotational speed of the classification, oil seals can be divided into low-speed oil seals (less than 6m/s) and high-speed oil seals (greater than 6m/s). According to oil seal can withstand the high and low classification, can be divided into normal pressure type oil seal and pressure-resistant type (greater than 0.05Mpa) Oil seal. Oil Seals According to the structure of oil seals and sealing principle classification, can be divided into standard type oil seal and power reflux type oil seal. In addition, according to the composition of oil seal assembly material classification, but also can be divided into a skeleton type oil seal and no skeleton type oil seal, spring-type oil seal and no spring type oil seal.
Advantages of oil Seals
1, Oil Seals oil seal structure simple, easy to manufacture. Simple oil seal can be molded once, even the most complex oil seals, manufacturing process is not complicated. Metal skeleton oil seals also only through stamping, bonding, inlay, molding and other processes can be metal and rubber composition of the required oil seal.
2, oil seal weight light, less supplies. Each type of oil seal is a combination of thin-walled metal and rubber parts, and its material consumption is very low, Oil Seals so the weight of each oil seal is very light.
3, the installation position of oil seal is small, the axial size is small, easy to process, and make the machine compact.
4, the seal of oil seal function is good, Oil Seals the service life is long. It has a certain adaptability to the vibration of the machine and the eccentricity of the spindle.
5, easy to remove oil seals, inspection and profits.
6. The price of oil seal is cheap.
Oil seals commonly used materials are: NBR, fluorine rubber, silicon rubber, acrylic rubber, polyurethane, PTFE and so on. When selecting the material of oil seal, Oil Seals it is necessary to consider the compatibility of the material to the working medium, the adaptability to the working temperature range and the following ability of the lip edge to rotate the rotating shaft at high speed. The temperature of the lip is higher than that of the working medium when the general oil seal is 20~50℃, and should be paid attention when choosing oil seal materials. The working range of the oil seal is related to the material used in the oil seal, for example, NBR Rubber (NBR) is-40~120℃, fluorine rubber (FPM) is-25~300℃.