GOVERNING VALVE DRIVE MECHANISM AND STEAM TURBINE

摘要

This governing valve drive mechanism is a governing valve drive mechanism (15) that opens/closes a steam flow path (12) with a valve body (13) in order to regulate the flow rate of steam in a steam turbine (10), and is equipped with: a valve body advancing/retreating mechanism (14) for advancing and retreating the valve body (13) toward and from the steam flow path (12); multiple sets of electric actuators (23A, 23B) each having a rotational drive source (26) and a conversion section (30) for converting rotation of the rotational drive source (26) into a linear motion; connection switching sections (38) by which the electric actuators (23A, 23B) can be individually connected to the valve body advancing/retreating mechanism (14); and a control unit (17) for controlling operations of the rotational drive sources (26) and connection switching sections (38).

主权项

1. A governing valve drive mechanism driving a governing valve which opens/closes a steam flow path, through which steam serving as a working fluid of a steam turbine circulates, with a valve body in order to regulate a flow rate of the steam, comprising:
a valve body advancing/retreating mechanism which advances and retreats the valve body toward and from the steam flow path; multiple sets of conversion mechanisms in which each set includes a rotational drive source and a conversion section which converts rotation of the rotational drive source into a linear motion; a connection switching section by which each set of the multiple sets of conversion mechanisms can be individually connected to the valve body advancing/retreating mechanism; and a control unit which controls operations of the rotational drive source and the connection switching section.