sui@qdczpower.com

Manufacturer of Turbine Components

Manufactures various types of steam turbines ranging from 5MW - 50MW,including condensing, backpressure, and extraction-condensing designs

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Coupling Bolts

Coupling bolts serve as the core fasteners connecting the turbine rotor to the generator rotor (or multi-cylinder rotor).

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Steam Turbine Bolts and Nuts

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Product Introduction

Coupling bolts serve as the core fasteners connecting the turbine rotor to the generator rotor (or multi-cylinder rotor). They are not ordinary fasteners but precision load-bearing components. Their primary function is to transmit high torque, ensure coaxial rotation of the rotors, and withstand alternating loads such as vibration, thermal stress, and centrifugal forces during unit operation. Their reliability directly determines whether the unit can operate stably, preventing catastrophic failures like rotor separation or excessive vibration.

1. Primary Functions:

1) Transmit rated torque.

2) Maintain rotor coaxiality.

3) Absorb transient loads.

4) Possess sufficient strength and toughness to ensure reliable connection.

2. Structural Types:

Primarily categorized as hydraulic expansion bolts and threaded hole bolts;

3. Common Failures:

1) Bolt loosening;

2) Bolt fracture;

3) Bolt corrosion and wear;

4) Uneven bolt preload;