Self cleaning brushes for grounding (earthing) of all types of stray electrical shaft currents in high speed rotating equipment. Prevent damage to bearings, seals, etc. by monitoring and grounding. Brushes can also be used for generator or electric motor on-line diagnostic work.

Brushes are self cleaning and work well even in dirty and oily environments. Submerged and partially submerged operation in oil is not a problem.

Built to be serviced during operation, (sometimes can even be installaed during operation). Used in radiation control areas at several nuclear power plants where maintenance is difficult or expensive. The grounding brushes are especially useful in these areas because maintenance or cleaning is usually unnecessary.

Failure to properly ground rotating shafts can result in unexpected outages and expensive damage, such as bearing failure due to spark erosion (sometimes called electrolysis). Catastrophic wrecks are a possibility. Technical papers on this subject are available.

In addition to their use as grounding (earthing) brushes, our brushes are also suitable for the transmission of instrument signals from a rotor (telemetry), without the use of special slip-rings. This allows continuous monitoring of parameters such as vibration, torque and voltage during normal field operation.

FEATURES OF SOHRE SHAFT RIDING FIBER BRUSHES

• Measures and grounds stray currents of any origin in: turbines, compressors, generators, motors, gears, pumps, ship propeller shafts and other rotating equipment.
• Bristle-type fiber brush element, made of silver and gold composite. Bristle element is replaceable during operation.
• Length of brush and installation position and location may be varied.
• Large and small sizes.
• Visual wear and position indicator. Electronic wear indicators available as an option.
• Brush voltage is insulated from casing, allowing voltage and current monitoring and selective grounding.
• Provision to raise fiber brush from shaft during operation, to inactivate if contact is not desired.
• Operates dry or with oil spray, oil splash (preferred), or immersion.
• Shaft surface velocity: In operation to approx. 400 ft/sec (125 m/sec).
• Wear life: Fiber brushes have been in continuous operation for years with minimal wear, and without loss of electrical performance. Design rating: 1 year continuous at rated current.
• Minimal axial shaft space required: approx. 0.75" (20 mm) standard.
• Suitable to 400 deg. F.
• Brush is suitable for transmission of instrument signals from the rotor without the need of special slip rings. This allows continuous monitoring of vibration, torque etc., during operation.
• Oil and gas tight assembly available.
• Nonmagnetic construction.

For more information, please visit : www.sohreturbo.com

Contact Information :

Tom Sohre - General Manager
132 Gilbertville Road P.O. Box 889
Ware, MA 01082-0889
U.S.
Tel : (413) 967-6908
Fax : (413) 967-5846
Email : tsohre@sohreturbo.com