EagleBurgmann Espey


Gears, drives, cou­plings, bearings or shafts with uni­ver­sal joints, having a wide range of dif­fer­ent designs, are used in almost every branch of industry. Delicate com­po­nents, such as the stators of elec­tri­cal con­vert­ers or complex me­chan­i­cal seals require barrier seals in order to guar­an­tee their func­tion­al­ity. Espey® carbon floating ring seals from EagleBurgmann Espey have proven their ef­fec­tive­ness as barrier seals for decades. Their ro­bust­ness and long service life are im­pres­sive, and they offer a long-last­ing, secure seal under any op­er­at­ing con­di­tions.

Application example: Sealing an oil-lubricated rotor bearing

Issue and challenge:

In some coun­tries such as Sweden and north-east­ern Germany, dis­trib­uted mobile con­verter units employ rotating con­vert­ers to change three phase power drawn from the public network into sin­gle-phase AC for use as railway traction power. In these areas, there are no ded­i­cated power lines to feed power to the railway network. The con­vert­ers are mounted in a fixed position on a wagon, which allows a sub­sti­tute con­verter to be used when they need repair or re­place­ment. The con­verter consists of a motor and a gen­er­a­tor. The bearing at one end of the gen­er­a­tor rotor can move axially. The bearing is lu­bri­cated by oil. The fan wheels needed for cooling at both ends of the rotor develop a vacuum that sucks the bearing oil into the stator and into the rotor con­tained within it. An easily fitted, short bearing seal with leakage removal is needed here to prevent the stator and rotor from getting oiled up.

Solution from EagleBurgmann Espey:

The operator of the rail power con­verter unit trusted the Espey® WD500 Special with leakage removal to prevent the stator and rotor becoming oiled up. The seal is designed for a tem­per­a­ture of 60 °C (140 °F), a pressure of 0.9 bar (13.05 PSI) and a rotation speed of 500 rpm. Thanks to the split casing it is easily mounted, and is only 50 mm (1.97 ”) long. The oil that seeps in as a result of the vacuum is trapped in a leakage col­lec­tion vessel, and is removed from time to time. The seal solution has a long service life, is main­te­nance-free, and com­pen­sates for shaft move­ments.


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