Backup device for link mechanism of steam turbine, steam turbine, and method for modifying steam turbine
AssigneeMitsubishi Heavy Industries Compressor Corporation
InventorKenichi Nishiyama
Life of this patent
Estimating the term…
Abstract
To provide redundancy to a link mechanism provided in a steam turbine. A backup device for a link mechanism includes a stand-by plate suspended from a regulating valve lever as a first link and located immediately below a contact stopper provided on a main rod as a second link. The backup device preferably further includes a clamp that is provided on the regulating valve lever and suspends the stand-by plate. If the links are disjoined due to damage to a joint that joins the links of the link mechanism and thus the main rod is disengaged from the regulating valve lever by its own weight, the contact stopper provided on the main rod is locked by the stand-by plate located immediately below the contact stopper.
Claims18
A backup device for a link mechanism of a steam turbine, the link mechanism being configured to be involved in an operation of a valve provided in the steam turbine, and provided between the valve driven by oil pressure and an actuator to which an electric signal is supplied,
- wherein the backup device comprises a locking portion configured to lock a contact portion of one of a first link and a second link included in the link mechanism by relative displacement of the first link and the second link caused by disjoining of the first link and the second link, on the other of the first link and the second link.
A method for modifying a steam turbine that is a method for adding a backup device including a stand-by member to a link mechanism, the link mechanism being configured to be involved in an operation of a valve provided in the steam turbine, and provided between the valve driven by oil pressure and an actuator to which an electric signal is supplied,
- wherein the method comprises a locking structure adding step of adding a locking structure to a first link and a second link included in the link mechanism, the locking structure being configured such that a locking portion configured to lock a contact portion of one of the first link and the second link by relative displacement of the first link and the second link caused by disjoining of the first link and the second link is provided on the other of the first link and the second link.
Dependencies are inferred from the claim text.