German SNR seals SNR models SNR prices

SNR 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 in transmission systems, and the term also refers to general liquids). They isolate lubricated parts in the transmission assembly from output components to prevent lubricating oil leakage. Seals used for static sealing and dynamic sealing (typically reciprocating motion) are called oil seals. The representative form of an oil seal is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully encapsulated in rubber. The term "oil seal" commonly refers to this type of tc skeleton oil seal.

SNR seals introduction

A mechanical seal is a shaft sealing device for rotating machinery, such as centrifugal pumps, centrifuges, reactors, and compressors. Since the drive shaft passes through the interior and exterior of the equipment, there is a circumferential gap between the shaft and the equipment. Media inside the equipment can leak outward through this gap; if the internal pressure is lower than atmospheric pressure, air can leak into the equipment. Therefore, a shaft sealing device is required to prevent leakage. There are many types of shaft seals. Due to advantages such as low leakage and long service life, mechanical seals are the primary shaft sealing method for these devices worldwide. Mechanical seals are also known as face seals. Relevant national standards define them as: "A device that prevents fluid leakage, formed by at least one pair of faces perpendicular to the axis of rotation that maintain contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism, in conjunction with auxiliary seals."

SNR seals structure and composition

1) Main components: rotating ring, stationary ring, cooling device, and compression spring (depending on the specific equipment). 2) Auxiliary seals: sealing rings (including O-shaped, X-shaped, U-type, wedge-shaped, rectangular flexible graphite, PTFE-covered rubber O rings, etc.). 3) Elastic compensation mechanism: springs, thrust rings, spring seats, keys, or various screws. 4) Classification: single-face, double-face; balanced, unbalanced; arbitrary rotation direction, fixed rotation direction.

SNR seals maintenance

1) Control of shaft seal pressure: High shaft seal pressure can cause steam leakage from 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 safety valve of the equalizing tank, wasting working fluid and damaging equipment. 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 gland and rotor gland section, leading to local stress concentration and deformation. This may alter the clearance between the rotor and 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 gland and rotor gland section are cooled, also causing local stress concentration, altering the clearance between the cylinder and 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 supply pipeline. In severe cases, this can lead to water ingress into the turbine.

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