German heinrich bethje seals heinrich bethje models heinrich bethje prices

heinrich bethje seals are typical representatives of oil seals; generally, the term "oil seal" refers to skeleton oil seals. The function of an oil seal is generally to isolate components requiring lubrication in transmission parts from the external environment, preventing lubricating oil leakage. The skeleton acts like rebar in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. Based on structural form, they can be divided into single-lip skeleton oil seals and double-lip skeleton oil seals. The secondary lip of a double-lip skeleton oil seal serves as a dust shield, preventing external dust, impurities, etc., from entering the machine interior. Based on skeleton type, they can be divided into inner-covered skeleton oil seals, exposed skeleton oil seals, and assembled oil seals. Based on operating conditions, they can be divided into rotating skeleton oil seals and reciprocating skeleton oil seals. Used for gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other locations.

heinrich bethje seal classification

Oil seals are generally divided into monolithic types and assembled types; assembled types allow free combination of the skeleton and lip material, generally used for special oil seals. Oil seals can be categorized into various forms and names based on sealing function, characteristics, structural type, operating state, and sealing mechanism, but conventionally, rotating shaft lip seals are called oil seals, while static seals and dynamic seals (generally reciprocating motion) are called sealing elements. The representative form of oil seals is the TC oil seal, which is a rubber-fully-covered double-lip oil seal with a self-tightening spring; the term "oil seal" commonly refers to this type of tc skeleton oil seal.

heinrich bethje seal materials

Common materials for oil seals include: Nitrile rubber, Fluorocarbon rubber, Silicone rubber, Acrylate rubber, Polyurethane, Polytetrafluoroethylene, etc. 1) Nitrile rubber (NBR): It has good heat resistance and wear resistance, resists various lubricating oils, greases, oil-gas mixtures, etc., applicable temperature range -30~120 degrees Celsius, but cannot be used in phosphate ester hydraulic oils and gear oils containing extreme pressure additives; it performs stably in gasoline and low-aniline-point mineral oils. 2) Polyacrylate rubber (ACM): Superior oil and heat resistance, wear resistance, ozone resistance, UV radiation resistance, especially resistant to lubricating oils, gear oils, motor oils, engine oils, petroleum-based hydraulic oils, etc. containing extreme pressure agents, suitable for operation in the -30~150 degrees Celsius range. 3) Fluorocarbon rubber: Aging resistance, heat resistance, oil resistance, suitable for almost all lubricating oils, fuel oils, gasoline; does not harden easily in oils containing extreme pressure additives, but has poor cold resistance and high-temperature wear resistance, and significant permanent compression deformation, suitable for temperatures -20~250 degrees Celsius. 4) Silicone rubber: Outstanding high and low-temperature resistance, can be used long-term at 150 degrees Celsius without performance change; can be used continuously at 200 for 10000h, maintaining its unique elasticity, ozone resistance, and weather resistance within the working temperature range of -70~260. 5) Polytetrafluoroethylene: Outstanding chemical stability, thermal stability, friction reduction, and self-lubrication, with a decomposition temperature above 400. Therefore, it can operate normally within the temperature range of -200~300 degrees Celsius. Except for free fluorine and alkali metals, it has excellent corrosion resistance to chemicals, solvents, hydroxides, and acids. Nitrile rubber and fluorocarbon rubber are widely used oil seal materials; the former is low-cost, but the latter offers significant improvements in temperature resistance and sealing, though at a higher cost, and still retains some negative commonalities of ordinary rubber materials, such as poor wear resistance, short service life, and high sensitivity to shaft eccentricity, so leakage phenomena remain relatively common. PTFE oil seals are high-tech products and represent the future direction of oil seal development [2]. When selecting oil seal materials, one must consider the material's compatibility with the working medium, adaptability to the working temperature range, and the lip's ability to follow the rotating shaft during high-speed rotation. Generally, when an oil seal is operating, the lip temperature is 20~50℃ higher than the working medium temperature, which should be noted when selecting oil seal materials. The operating range of an oil seal depends on the material used: Nitrile rubber (NBR) is -40~120℃, Acrylic rubber (ACM) is -30~180℃, and Fluorocarbon rubber (FPM) is -25~300℃.

heinrich bethje seal installation and shutdown

1) Before starting, keep the seal chamber filled with liquid. When transporting solidified media, use steam to heat the seal chamber to melt the medium. Manual cranking must be performed before starting to prevent sudden startup from causing the soft ring to shatter. 2) For mechanical seals utilizing an external seal oil system, start the seal oil system first. Stop the seal oil system last after shutdown. 3) After stopping a hot oil pump, do not immediately stop the cooling water for the seal oil chamber and face seal; wait until the oil temperature at the face seal drops below 80 degrees before stopping the cooling water to avoid damaging seal components.

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