The Concept Of Seals:
Seals are materials or parts that prevent fluid or solid particles from leaking between adjacent joint surfaces and prevent foreign impurities such as dust and moisture from intruding into parts of machinery and equipment.
Common Name:
Sealing ring, packing, mechanical seal, oil seal, water seal, gasket plate, sealant, soft packing, hydraulic seal, pneumatic seal, cylinder seal, cylinder seal, breaker seal, engineering machinery seal, etc.
Use Classification Editing:
(1) Classified by function:Divided into shaft seal, hole seal, dust seal, guide ring, fixed seal, rotary seal;
(2) Classified by material:Divided into nitrile rubber, EPDM rubber, fluorine rubber, silica gel, fluorine silicon rubber, nylon, polyurethane, engineering plastics, etc...
Use Points:
(1) Choose suitable seal material and hydraulic oil, as well as adaptability to working temperature and compatibility to oil.
(2) The geometrical position accuracy (concentricity) of the sliding parts relative to the seal is high and the material is good (such as hard chrome plating) and the surface roughness is fine to extend the service life.
① For oil seals used in hydraulic pumps and motor journals, not only the roughness of the sliding surface is required to be within 0.25m, but also hard chrome plating is required on the surface. In specific use, the diameter of the oil seal lip needs to be adjusted appropriately according to the specific conditions. Force the spring to make it tight enough, and use a mounting sleeve or thin washer to protect the sealing ring during installation to prevent the lip from being rolled and twisted, causing the spring to slip out.
②The commonly used rolling processing method for the inner surface of the hydraulic cylinder not only improves the surface roughness, but also makes the surface hardened by cold work, which is beneficial to prolong the service life of the seal ring. In addition, the pressure used, the length and type of the sliding surface also have a great influence on the service life. Therefore, the time for "scheduled inspection" should be determined based on these conditions.
③The sealing surface is required to be in good lubrication state to prevent dirt from invading people. The use of oil up to the required cleanliness level and the correct installation method are also necessary conditions.