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ibrepa seals refer to devices that prevent fluid leakage, formed by at least one pair of end faces perpendicular to the rotation axis maintaining contact and sliding relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, in conjunction with auxiliary seals. Mechanical seals where the auxiliary seal of the compensation ring is a metal bellows are called bellows mechanical seals. There are mainly the following four types of components. a. Primary sealing elements: rotating ring and stationary ring. b. Auxiliary sealing elements: O-rings. c. Clamping elements: springs, thrust rings. d. Drive elements: spring seat and keys or fixing screws.

ibrepa seal construction

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

ibrepa seal usage guide

1) When the gearbox lubricating oil volume is ≤ 7 liters, the addition amount per liter of lubricating oil is 20‐30ml; 2) When 7‐15 liters, the addition amount is 15‐20ml per liter of lubricating oil; 3) When > 15 liters, the addition 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 cannot seal oil, the displacement method can be used for compensation.

ibrepa 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 media 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, which seriously threatens 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 causes intense heating at the shaft end steam seal and rotor steam seal sections, resulting in local stress concentration and certain deformation. This may change the clearance between the rotor and the cylinder, increase steam leakage from the shaft seal, increase differential expansion, and potentially cause serious rubbing between stationary and rotating parts. When the shaft seal temperature is too low, the shaft end steam seal and rotor steam seal sections are cooled, similarly causing local stress concentration, changing the clearance between the cylinder and the rotor, increasing steam leakage at the shaft end, and decreasing differential expansion. Low shaft seal temperature may also result in water carryover in the shaft seal supply steam, causing water hammer in the shaft seal supply pipeline. In severe cases, this leads to water ingress into the turbine.

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