German cefo elastic seals, cefo elastic models, cefo elastic prices

cefo elastic seals are sealing devices designed to prevent leakage between the pump shaft and the housing. Common types of shaft seals include packing seals, mechanical seals, and hydrodynamic seals. The shaft seal of a reciprocating pump is usually a packing seal. When conveying media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly include packing seals, mechanical seals, and hydrodynamic seals. The shaft seal of a reciprocating pump is usually a packing seal. When conveying media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly include packing seals, mechanical seals, and hydrodynamic seals.

cefo elastic seal principle

Since there is an oil film controlled by the oil seal lip edge between the oil seal and the shaft, this oil film has fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil film causes the end in contact with air to form a meniscus, preventing the leakage of the working medium and thereby achieving sealing of the rotating shaft. The sealing capability of the oil seal depends on the thickness of the oil film on the sealing surface; if the thickness is too great, the oil seal will leak; if the thickness is too small, dry friction may occur, causing wear on the oil seal and shaft; if there is no oil film between the sealing lip and the shaft, it is easy to cause heating and wear. Therefore, during installation, some oil must be applied to the sealing ring, and it must be ensured that the skeleton oil seal is perpendicular to the shaft axis; if not perpendicular, the sealing lip of the oil seal will wipe the lubricating oil off the shaft, which will also lead to excessive wear of the sealing lip. During operation, it is ideal for a small amount of lubricant in the housing to seep out slightly to achieve the state of forming an oil film at the sealing surface.

cefo elastic seal function

The general function of a skeleton oil seal is to isolate components requiring lubrication in the transmission assembly from the output components, preventing lubricating oil from leaking. It is typically used on rotating shafts and is a type of rotating shaft lip seal. The skeleton acts like reinforcing steel in concrete components, providing reinforcement and allowing the oil seal to maintain its shape and tension. Based on the skeleton type, they can be classified into inner skeleton oil seals, outer skeleton oil seals, and exposed inner and outer skeleton oil seals. Skeleton oil seals are made of high-quality nitrile rubber and steel plates, offering stable quality and long service life. They are widely used in automobiles, motorcycle crankshafts, camshafts, differentials, shock absorbers, engines, axles, front and rear wheels, and other parts. 1) Prevent sand, dust, water vapor, etc., from invading the bearing from the outside; 2) Restrict the leakage of lubricating oil from the bearing. Requirements for oil seals include that dimensions (inner diameter, outer diameter, and thickness) must comply with regulations; appropriate elasticity is required to properly grip the shaft and provide a sealing effect; they must be heat-resistant, wear-resistant, have good strength, be resistant to media (oil or water, etc.), and have a long service life.

cefo elastic seal precautions

1) Shaft speed: Due to design and structural reasons, high-speed shafts should use high-speed oil seals, and low-speed shafts should use low-speed oil seals. Low-speed oil seals must not be used on high-speed shafts, and vice versa. 2) Ambient temperature: In cases of higher operating temperatures, polyacrylate or silicone, fluorine, or silicone-fluorine rubber should be selected. Measures should be taken to reduce the oil temperature in the oil tank. In cases of lower operating temperatures, cold-resistant rubber should be selected. (3) Pressure: General oil seals have poor pressure resistance; excessive pressure will cause the oil seal to deform. Under conditions of excessive pressure, pressure-resistant support rings or reinforced pressure-resistant oil seals should be used. 4) Installation eccentricity: If the eccentricity is too large when the oil seal fits with the shaft, its sealing performance will deteriorate, which is particularly severe at high shaft speeds. If the eccentricity is too large, an oil seal with a "W" shaped cross-section can be used. 5) Shaft surface finish directly affects the service life of the oil seal; that is, the higher the shaft surface finish, the longer the oil seal service life. 6) Ensure that there is a certain amount of lubricating oil on the lip of the oil seal. 7) Pay special attention to preventing dust from entering the oil seal.

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