O-rings
O-rings are circular elastic sealing devices primarily used for static sealing and reciprocating motion sealing to prevent liquid or gas leakage. Material selection directly impacts sealing performance and service life. Common materials include nitrile rubber and fluorocarbon rubber, suitable for applications such as bearing seals and hydraulic systems.
Applications of Dynamic O-rings Products
Dynamic sealing refers to a technology that seals between relatively moving components. It is widely used in various industrial equipment and machinery to prevent fluid leakage or the ingress of external contaminants. Below are application examples and schematic illustrations of dynamic sealing across different fields.
1. Dynamic O-rings in Hydraulic Systems
In hydraulic cylinders, dynamic seals are primarily used to seal the piston and piston rod. For instance, O-rings are commonly employed in short-stroke or small-diameter hydraulic cylinders. They achieve sealing through elastic deformation and are suitable for dynamic sealing of liquids, fluids, compressed air, etc. Additionally, dynamic seals are extensively used in the hydraulic systems of injection molding machines. At the connection points between the piston rods and chambers of mold clamping cylinders and injection cylinders, multi-lip seals are utilized. The primary lip prevents high-pressure hydraulic oil leakage, while the secondary lip blocks external dust.
2. Dynamic Seals in Injection Molding Machines
Hydraulic System Cylinder Dynamic Seals: Multi-lip seals are employed, with primary lips preventing high-pressure hydraulic oil leakage and secondary lips isolating external dust. These are suitable for high-pressure, high-temperature conditions.
Injection System Check Seals: Modified H-type oil seals are used at the mating surfaces between the backstop ring and screw. The low-friction properties of PTFE reduce resistance to melt backflow.
High-frequency dynamic seals for mold-moving devices: H-type oil seals are employed on the piston rod of the mold-adjusting mechanism and the slide rails of the ejection mechanism, meeting the service life requirements for high-frequency reciprocating motion.
3. High-Temperature, High-Pressure Gas Dynamic Seals
A high-temperature, high-pressure gas sheet-type elastic dynamic seal structure. Fabricated by bonding carbon fiber cloth, glass fiber cloth, and other woven materials with a novel alloy layer using high-temperature structural adhesive. This seal structure is suitable for lubrication-free shaft end sliding seals, radial sliding seals, and cylinder barrel sliding seals, capable of operating under complex high-temperature, high-pressure conditions (temperature ≤1200°C).
4. Dynamic Seals in Aeroengines
Floating ring seals: Utilize buoyancy generated by rotor eccentric motion to isolate graphite rings from fluids in the raceway gap, preventing gas leakage. Suitable for high-speed applications.
Magnetic seals: Replace spring force with magnetic force, relying on magnetic attraction to press sealing surfaces together. Widely used in aeroengine accessory casings, output shafts, and similar components.
5. Dynamic Seals in Vacuum Environments
Vacuum magnetohydrodynamic seals leverage the adaptive properties of magnetic nanofluids within gradient magnetic fields to form liquid sealing barriers. This achieves zero-wear dynamic sealing during shaft rotation. Characterized by low leakage rates, minimal friction torque, and extended service life, they are suitable for dynamic sealing applications in vacuum environments such as semiconductor manufacturing, vacuum coating, and aerospace engineering.