Germany bmb handels seals bmb handels models bmb handels prices

bmb handels seals are the customary term for general seals; simply put, they are seals for lubricating oil. They are mechanical components used to seal grease (oil is the most common liquid substance in transmission systems, and also refers to general liquid substances). They isolate the parts requiring lubrication in the transmission assembly from the output parts, preventing lubricating oil leakage. Seals used for static sealing and dynamic sealing (generally reciprocating motion) are called oil seals. The representative form of oil seals is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully covered by rubber. Commonly referred to oil seals usually mean this type of tc skeleton oil seal.

bmb handels seal principle

Since there is an oil film controlled by the oil seal lip 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 where the oil film contacts the 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 drain the lubricating oil from the shaft, leading to excessive wear of the sealing lip. During operation, it is ideal for a slight amount of lubricant in the housing to seep out to achieve the formation of an oil film at the sealing surface.

bmb handels seal function

The function of a skeleton oil seal is generally to isolate the parts requiring lubrication in the transmission assembly from the output parts, preventing lubricating oil leakage. It is typically used on rotating shafts and is a type of rotating shaft lip seal. The skeleton acts like steel reinforcement in concrete components, providing reinforcement and allowing the oil seal to maintain its shape and tension. According to the skeleton type, it can be divided 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 achieve sealing; they must be heat-resistant, wear-resistant, strong, resistant to media (oil or water, etc.), and have a long service life.

bmb handels seal maintenance

1) Control of shaft seal pressure: High shaft seal pressure can easily cause steam blowout from the shaft seal, making it easy for water to enter the oil and deteriorate the turbine oil quality. Excessively high shaft seal pressure will trigger the action of the equalizing box safety valve, wasting working fluid and damaging equipment. Too low shaft seal pressure may cause a drop in unit vacuum, allowing cold air to enter the shaft seal or even the cylinder, causing cooling of the shaft seal section or inside the cylinder, seriously threatening equipment safety. 2) Impact of abnormal shaft seal temperature on the unit: When the shaft seal temperature is too high, especially before unit startup, excessive heat will cause intense heating at the shaft end gland and rotor gland section, producing local stress concentration, leading to certain deformation. This may change the clearance between the rotor and cylinder, increase shaft seal steam leakage, increase differential expansion, and in severe cases, cause stationary and rotating part friction. When the shaft seal temperature is too low, the shaft end gland and rotor gland section will be cooled. Similarly, this will produce local stress concentration, changing the clearance between the cylinder and rotor, increasing shaft end steam leakage, and decreasing differential expansion. When the shaft seal temperature is too low, the shaft seal supply steam may carry water, causing water hammer in the shaft seal supply pipeline. In severe cases, this can lead to water ingress into the turbine.

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