Mitsubishi Heavy Industries Compressor Corporation

Makoto Katagake

Naoyuki Nagai

Tomoaki Okamura

Hideki Tonaka

Yoshitaka Hamamoto

Naruhito Harada

A linear motion mechanism, including a drive portion, a screw shaft which is rotationally driven about an axis by the drive portion and in which a first spiral screw groove is formed on an outer peripheral surface, a nut in which a second spiral screw groove facing the first screw groove is formed on an inner peripheral surface and which moves forward or backward relative to the screw shaft in an axial direction, in which an axis of the screw shaft extends, according to a rotation of the screw shaft, a plurality of load balls which are disposed in a transfer path formed by the first screw groove and the second screw groove and advance while rolling on the transfer path, a plurality of retainer frames which are disposed between the plurality of load balls and advances on the transfer path along with the load balls.

Linear motion mechanism, valve device, and steam turbine

A linear motion mechanism () is provided with: a cylinder rod () into which a ball screw () can be inserted, said cylinder rod () including a base end section that is connected to a nut () within a piston casing () and a tip section () that is exposed on the outside of the piston casing (); a nut-side grease supply hole () that is formed in the nut () and that includes a discharge port () that opens toward the outer circumferential surface of the ball screw (); and a cylinder rod-side grease supply hole () that is formed in the cylinder rod (), that includes on one end thereof an inlet () that opens at a position that is exposed to the outer section of the piston casing (), and that includes another end () that is connected to the nut-side grease supply hole ().

Linear motion mechanism, governing valve drive device, and steam turbine

A steam turbine includes a turbine body; a steam flow passage; a regulating valve which regulates opening and closing of the steam flow passage with a linear motion; a switching drive mechanism which drives the regulating valve; an electronic governor which controls at least the switching drive mechanism; and a controller unit. The switching drive mechanism has an electric motor which rotates when supplied with power, a conversion mechanism which converts a rotary motion of the electric motor into a linear motion of the regulating valve, and a brake which brakes the rotary motion of the electric motor. At least one of the controller unit and the electronic governor performs control such that the brake is actuated and the position of the regulating valve is maintained when at least one of the electric motor and the controller unit breaks down.

Steam turbine

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

Governing valve drive mechanism and steam turbine

A steam turbine includes a turbine main body having blades supported rotatably, a steam channel which is connected to the turbine main body and in which steam flows, a regulating valve configured to linearly move to adjust opening/closing of the steam channel, and an opening/closing drive mechanism configured to drive the regulating valve. The opening/closing drive mechanism includes an electric motor configured to rotate by an electric power being supplied, a conversion mechanism configured to convert rotational motion of the electric motor into linear motion of the regulating valve, and a brake operated by regenerative energy of the electric motor.

Growing community of inventors

Hiroshima, Japan

Makoto Katagake