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Dongguan Minz Rubber & Plastics Co., Ltd.

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O-ring application, rotary seal device design, O-ring manufacturer

Release time:

2019-05-27 12:30

Source:

O-ringApplication, rotary seal device design, O-ring manufacturer
 
Application of O-ring in rotary motion sealing device In rotary motion sealing device, oil seal and mechanical seal are usually used. However, the pressure of the oil seal is low, and compared with the O-ring seal, it is too large and complicated, and the manufacturability is poor.
 
Although the mechanical seal can withstand high pressure (40MPa), high speed (50 m/s) and high temperature (400 ℃), but the structure is complex and huge, mainly due to high cost, and is only suitable for some heavy machinery and equipment such as petroleum and chemical industry. The main problem with O-ring seals for rotary motion seals is the Joule heating effect.
 
Joule heating effect causes friction heat at the contact between the high-speed rotating shaft and the O-ring. The generated heat causes the temperature of the contact part to rise continuously, the rubber material is severely deformed by heating, and the elongation and compression changes. Heating also accelerates the aging of the seal material and shorts the service life of the O-ring; destroys the sealing oil film, causes the phenomenon of oil cut, and accelerates the wear of the seal.
Based on the above situation, in recent years, the O-ring for rotary motion has been extensively studied at home and abroad. In order to avoid the occurrence of Joule heating effect, the main problem is to correctly select and design the structural parameters of the O-ring according to the performance of the rubber seal material, mainly the stretch and compression rate of the O-ring seal. According to the experiment, the O-ring seal for rotary motion is designed to have an inner diameter equal to or larger than the diameter of the rotating shaft, generally 3% ~ 5% larger. When installing the O-ring seal, it is compressed inward from the inner diameter, and the compression of the section is designed to be smaller, generally about 5%.
 
In addition, the heat dissipation problem at the installation of the O-ring is fully considered for the sealing material that is less affected by heat as much as possible. In this way, the working condition of the O-ring is greatly improved, and it can be used in the sealing device of the rotating shaft with the highest rotation speed of 4 m/s. In recent years, there have been heat-resistant fluorine rubber seals and wear-resistant polyurethane rubber seals, and have a deeper understanding of the Joule heating effect of rubber seals, and research solutions to the Joule thermal problem, and design a new O-ring seal structure, so that O-ring seals can be better applied with high-speed, high-pressure rotary motion.
 
O-ring seals are widely used in rotary motion sealing devices due to their small size, simple structure, low cost, good process performance, and wide application range.

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