CBD.SEALS

Tel: 86-17788539660

Email: sale@bdseals.com

Aerospace

  • CBD.SEALS
  • Aerospace

    • Seals in aerospace are critical components that ensure the proper operation of aircraft in extreme environments. These seals must be able to maintain their performance in high temperature, low temperature, high pressure, low pressure, vacuum and possibly chemical corrosive environments.

    Types of seals

    Static seals: used for sealing between fixed parts, such as hatches, windows, pipe connections, etc.

    Dynamic seals: used for sealing between relatively moving parts, such as pistons and cylinders, shafts and bearings.

    Rotary seals: specially used for sealing rotating shafts, such as engine shaft seals.

    Material selection

    Rubber seals: such as nitrile rubber (NBR), fluorine rubber (FKM), silicone rubber (VMQ), etc., with good elasticity and oil resistance.

    Metal seals: such as stainless steel, copper, aluminum, etc., suitable for high temperature and high pressure environment.

    Composite seals: combining the advantages of metal and rubber, such as metal-coated rubber, filled polytetrafluoroethylene (PTFE), etc.

    Design requirements

    Temperature resistance: the ability to maintain performance at extreme temperatures, from very low temperatures (e.g., low temperatures in space) to high temperatures (e.g., high temperatures inside an engine).

    Pressure resistance: able to maintain sealing in both high and low pressure environments.

    Chemical resistance: able to resist corrosion from fuels, lubricants, hydraulic fluids and other chemicals.

    Abrasion resistance: Ability to resist abrasion and maintain long-term sealing performance in moving parts.

    Reliability: within the design life, the seal must maintain its function, no leakage.

    Manufacturing process

    Molding: applicable to the manufacture of rubber and certain composite seals.

    Machining: applicable to the manufacture of metal seals.

    Injection molding: applicable to the manufacture of certain plastic seals.

    Testing and verification

    Leakage testing: Leakage testing is carried out by means of a medium such as helium or nitrogen to ensure that the seals are leak-free.

    Environmental testing: Seal performance is tested in simulated extreme environments such as thermal cycling, vibration, shock, etc.

    Life test: Evaluate the service life of seals through accelerated aging test.

    Application examples

    Spacecraft hatch seals: Ensure that no leakage occurs in spacecraft during launch and in the space environment.

    Engine sealing: including sealing of combustion chamber, turbine, pump and other components to prevent fuel and lubricant leakage.

    Hydraulic system seals: Ensure that the hydraulic system works properly under high pressure without leakage.