O-ring is a circular section of the rubber ring. O-Ring is one of the most widely used seals in hydraulic and pneumatic systems. O-Ring has good sealing, can be used for static seals, can also be used in reciprocating movement seals, not only can be used alone, but also a number of modular sealing devices in the basic components. Molded O Ring It has a wide range of applications, and if the material is properly selected, it can meet the requirements of a variety of motion conditions, working pressure can be from 1.333x105pa Vacuum to 400MPa high pressure; The temperature range can be from 60 ℃ to 200 ℃. The O-Ring has the following characteristics compared with other sealing types:
1. Small structure size, easy to install and dismantle.
2 static and dynamic seals can be used, as a static seal almost no leakage.
3 The use of a single O-ring, there is a two-way sealing effect.
4 friction resistance is small.
5 Low price.
O-Ring is a kind of squeeze-type seal, the basic working principle of squeeze-type seal is to rely on the elastic deformation of the seal, Molded O Ring the contact pressure in the sealing contact surface, the contact pressure is greater than the internal pressure of the sealed medium, Molded O Ring then the leakage is not occurred. In the case of static seal and dynamic seal, the cause of contact pressure of seal contact surface and calculation method are different, which need to be explained separately.
Sealing principle for static sealing
The O-ring is the most widely used in the static seal. Molded O Ring If the design and use of the correct, O-ring in the static seal can be achieved without leakage of the absolute seal.
After the O-ring is loaded into the sealing groove, the section is subjected to contact compressive stress and produces elastic deformation. A certain initial contact pressure PO is produced on the contact surface. Even if there is no medium pressure or little pressure, O-ring can also be sealed by its own elastic force; When the cavity is filled with pressure media, the O-ring is shifted to the low pressure side under the action of the medium pressure, Molded O Ring and the elastic deformation is further enlarged, and the filling and closing gap δ. At this point, the contact pressure for the sealing accessory surface rises to PM:
O-Ring as the basic sealing element of hydraulic system, because of its low cost, easy to use, economical, fast and effective sealing effect, make it become the most widely used sealing element.
O-Ring is formed in the mold vulcanization. It has a wide range of sizes and can be used to seal all liquids and gaseous media.
O-Ring in the fluid sealing system has a variety of applications, with the rapid development of sealing elements, the current O-ring as a static seal in the fluid sealing system has a great advantage. In order to make the O-ring as far as possible to play its own advantages, in the design of the application to take into account when the installation to avoid damage O-ring, the fluid elements should be inverted, Molded O Ring clear burr and slag dust. Prevents the O-ring from twisting in the groove causing the seal to fail.