German FRONIUS seals, FRONIUS models, FRONIUS prices

FRONIUS seals are typical representatives of oil seals; the term "oil seal" generally refers to skeleton oil seals. The function of an oil seal is generally to isolate components requiring lubrication within 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 a dust-proof function, 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 in gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other locations.

FRONIUS seal features

1) No need to measure the seal working length during installation; 2) The shaft can be adjusted at any time; 3) No leakage occurs at startup because the seal has been pre-tested; 4) Installation only requires tightening the seal cover bolts, making assembly quality easy to ensure; 5) Protects the sealing surface from contamination by debris or damage due to operational errors before installation or startup; 6) Can be readjusted after thermal expansion of the machinery; 7) Self-centering via fit; 8) Easy to remove the seal for cleaning and inspection without disassembling the pump equipment. The API682 standard recommends cartridge mechanical seals for all mechanical seals.

FRONIUS seal startup preparation

1) Comprehensively check whether the mechanical seal, auxiliary devices, and pipeline installations are complete and comply with technical requirements. 2) Perform a static pressure test before starting the mechanical seal to check for leakage. If there is significant leakage, identify the cause and eliminate it. If ineffective, disassemble for inspection and reinstall. Generally, the static test pressure is 2~3 kg/cm². 3) Rotate the pump according to its direction of rotation to check if it is light and uniform. If rotation is difficult or stuck, check for incorrect assembly dimensions or unreasonable installation.

FRONIUS seal maintenance

1) Control of shaft seal pressure: High shaft seal pressure can cause steam venting at the shaft seal, easily 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 section, producing local stress concentration and resulting in certain deformation. This may change the clearance between the rotor and cylinder, increase steam leakage at the shaft seal, increase differential expansion, and potentially cause serious rubbing between stationary and rotating parts. When shaft seal temperature is too low, the shaft end steam seal and rotor steam seal section are cooled, similarly producing local stress concentration, changing the clearance between the cylinder and rotor, increasing steam leakage at the shaft end, and decreasing differential expansion. Low shaft seal temperature may also cause water carryover in the shaft seal supply steam, leading to water hammer in the shaft seal supply pipeline. In severe cases, this causes water ingress into the turbine.

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