Germany neuhaus seals neuhaus model neuhaus price

neuhaus seals are a typical representative 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 reinforcing steel in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. According to 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 a dust-proof function, preventing external dust, impurities, etc., from entering the machine interior. According to skeleton type, they can be divided into internally covered skeleton oil seals, externally exposed skeleton oil seals, and assembled oil seals. According to operating conditions, they can be divided into rotating skeleton oil seals and reciprocating skeleton oil seals. Used in gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other locations.

neuhaus seal construction

The skeleton oil seal structure consists of three parts: the seal body, the reinforcing skeleton, and the self-tightening helical spring. The sealing body is further divided into the bottom, waist, cutting edge, and sealing lip according to different parts. Typically, in the free state, the inner diameter of a skeleton oil seal is smaller than the shaft diameter, meaning it has a certain "interference fit." Therefore, after the oil seal is installed into the seal housing and onto the shaft, the pressure from the oil seal cutting edge and the contraction force of the self-tightening helical spring exert a certain radial tightening force on the shaft. After a period of operation, this pressure will rapidly decrease or even disappear; thus, the spring can continuously compensate for the oil seal's self-tightening force.

neuhaus seal usage instructions

1) When gearbox lubricating oil volume is ≤ 7 liters, the additive amount per liter of lubricating oil is 20‐30ml; 2) 7‐15 liters, the additive amount is 15‐20ml per liter of lubricating oil; 3) >15 liters, the additive amount is 10ml per liter of lubricating oil; 4) Oil seals not in temporary use should be stored properly to prevent contamination with oil stains, dust, or exposure to sunlight. 5) When the shaft diameter wears into a "V" shaped groove, causing the contact pressure between the new oil seal lip and the shaft to drop such that it no longer seals effectively, a displacement method can be used for compensation.

neuhaus seal maintenance

1) Control of shaft seal pressure: High shaft seal pressure can easily cause steam leakage from the shaft seal, leading to water ingress into the oil and deterioration of 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 shaft seal temperature is too high, especially before unit startup, excessive heat causes intense heating at the shaft end steam seal and rotor steam seal sections, producing local stress concentration phenomena, thereby causing certain deformation. This may change the clearance between the rotor and cylinder, increase steam leakage from the shaft seal, increase differential expansion, and in severe cases, cause stationary-to-rotating part friction. When shaft seal temperature is too low, the shaft end steam seal and rotor steam seal sections are cooled; similarly, this produces local stress concentration phenomena, changing the clearance between the cylinder and rotor, increasing steam leakage at the shaft end, and decreasing differential expansion. When 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 leads to water ingress into the turbine.

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