BHS Rotor Turning Gear Units
BHS rotor turning gear units primarily provide safe cooling for hot rotors in a steam or gas turbine or compressor by slow turning. This helps the rotor remain dimensionally stable. Rotor turning gear units also provide for breakaway, startup, or precisive positioning of shaft trains.
Voith offers solutions for free and connected shaft ends that cover requirements from 0.2 to 500 rpm and breakaway torques of up to 100 000 Nm.
Customers value the rotor turning gear in a package with a BHS turbo gear unit in case of a free available shaft end.
Voith's more than 40 years of experience in designing rotor turning gear units and more than 2 000 references confirm the reliability and safety of BHS rotor turning gear units.
|Motor power||0.75 – 200 kW|
|Speeds||from 0.2 to 500 rpm|
|Breakaway torque and mass
moments of inertia
|300 to 100 000 Nm
up to 100 000 kg m²
|Meets the following standards||ATEX|
Advantages and Benefits
BHS rotor turning gear units from Voith
- deliver high reliability and low failure rates, thanks to the excellent quality of their components and robust design. This helps retain your system's productivity.
- allow a high degree of flexibility in line configuration, thanks to the swivel pinion principle as no free shaft end is required. This reduces your overall investment costs.
- Protect the value of your equipment with the precision-controlled cooling delivered by the rotor turning gear unit. Your repair-related costs will be lower.
- enable an additional increase in system availability through integration of additional safety components, thus improving your ROI.
Rotor turning gear unit with overrunning clutch for installation on the free shaft ends of
- gear units
- steam turbines
- axial compressors
- radial compressors
- integrally geared compressors
Rotor turning gear unit with swivel pinion with no free shaft end for installation on
- coupling guard
- turbine bearing block
- bearing housing of the integrally geared compressor
- Power plants
- Oil & gas (upstream, midstream, downstream)
- Test beds
The BHS rotor turning gear unit can be mounted on the free pinion shaft end of a gear unit, for example. After checking the startup conditions (electrical voltage, lubricating oil pressure, hydraulic fluid boost, turbine rotor stopped), the rotor turning gear unit establishes the connection with the rotor on startup. The rotor turning gear unit then brings the shaft train to a predefined speed.
As the line continues to accelerate, the rotor turning gear unit decouples by having the slip gearing release the connection from the rotor turning gear unit and the swivel pinion in the axial direction and allowing the centrifugal forces to push the locking latches radially outwards. The rotor turning gear unit now spins down until it shuts off. If the shaft train shuts down for maintenance work, for example, the rotor turning gear unit is simultaneously brought back up to its rated speed. The latches lock in, and the rotor turning gear unit and the shaft connect upon speed synchronization. The shaft train is brought to a low speed in a controlled manner. The rotor turning gear unit is switched off in order to stop the rotor.
Fully automatic operation
The rotor turning gear unit can be mounted on the bearing housing of a gas turbine, for example. After checking the startup conditions, such as compressed air feed, electrical voltage, lubricating oil pressure, hydraulic fluid boost and stopped turbine rotor, the swivel pinion engages with the gearing on the turbine shaft. In this way, the rotor turning gear unit brings the shaft train up to the rated speed for the rotor turning gear unit. This enables the gas turbine to continue accelerating on its own. The rotor turning gear unit disengages and spins down until it shuts off. If the shaft train is shut down for maintenance work, the rotor turning gear unit returns to its rated speed once a specific turbine coastdown speed is reached. When the speeds are synchronized, the rotor turning gear unit swivel pinion re-engages and brings the shaft train to a low speed in a controlled manner. The rotor turning gear unit is switched off in order to stop the rotor.