Method for removing turbine blade, removal device for executing said method, and rotor set with said removal device

Patent metadata

Field	Value
Publication number	US-10876405-B2
Application number	US-201616064320-A
Country	US
Kind code	B2
Filing date	Dec 27, 2016
Priority date	Jan 8, 2016
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

A removal device includes a base, a push rod, a rod-moving mechanism and a rod guide. The base is restrained immovably in a first direction. The push rod can protrude from a front surface of the base toward a front side. The rod-moving mechanism is installed on the base. The rod-moving mechanism moves the push rod toward the front side. The rod guide is attached to the base. The rod guide guides movement of the push rod by the rod-moving mechanism in a second direction that forms an acute angle with respect to the first direction.

First claim

The invention claimed is:

1. A removal device for a turbine blade, comprising:
a base restrained immovably toward a front side and a rear side with respect to a rotor shaft which supports the turbine blade, the front side being one side in a first direction in which an axis of the rotor shaft extends, the rear side being an opposite side in the first direction;
a push rod that is able to protrude from a front surface of the base facing the front side;
a rod-moving mechanism installed on the base and configured to move the push rod toward the front side; and
a rod guide attached to the base and configured to guide movement of the push rod by the rod-moving mechanism in a second direction that forms an acute angle with respect to the first direction,
wherein the rod-moving mechanism has a taper-forming body on which a tapered surface is formed so as to face the front side and so as to be inclined with respect to a virtual surface perpendicular to the first direction, and the taper-forming body is provided on the base such that the tapered surface is relatively movable, in a plane parallel to the virtual surface, with respect to an end surface of the rear side of the push rod while coming in contact with the end surface.

2. The removal device for a turbine blade according to claim 1 , wherein the base has a frame on which the rod-moving mechanism is installed and to which the rod guide is attached, and a movement-restraining mechanism configured to restrain movement of the frame in the first direction,
the movement-restraining mechanism has a pressing member having at least a portion that is disposed on the front side or the rear side opposite to the front side with respect to the frame,
the base has a first movement-restraining mechanism that is the movement-restraining mechanism, and a second movement-restraining mechanism configured to restrain movement of the frame in a third direction perpendicular to the first direction and the second direction,
the second movement-restraining mechanism has an arc surface that is a surface facing one side in the third direction, is disposed on the one side in the third direction with respect to the base and is formed in an arc shape about a virtual axis extending in the first direction,
the rod guide has a guide hole passing therethrough in the second direction and with which the push rod is able to come in sliding contact, and
the rod guide is detachably attached to the base.

3. The removal device for a turbine blade according to claim 1 , wherein the rod-moving mechanism has a rotation center shaft,
the taper-forming body is attached to the rotation center shaft to be rotatable about the rotation center shaft, and
the tapered surface extends in a circumferential direction with respect to the rotation center shaft.

4. The removal device for a turbine blade according to claim 3 , wherein the taper-forming body has a rotating plate that rotates about the rotation center shaft, and a handle extending from an outer circumference of the rotating plate in a radial direction with respect to the rotation center shaft, and
the tapered surface is formed on the rotating plate.

5. A rotor set, comprising:
the removal device for a turbine blade according to claim 1 ;
a rotor shaft; and
a plurality of turbine blades attached to an outer circumferential side of the rotor shaft,
wherein each of the plurality of turbine blades has a blade body extending in the radial direction with respect to the rotor shaft and forming a blade profile, and a blade root formed inside the blade body in the radial direction,
a blade root groove recessed from the outside in the radial direction toward the inside in the radial direction, extending in an inclination direction that forms an acute angle with respect to an axial direction in which the rotor shaft extends, and into which the blade root is inserted, is formed in the rotor shaft, and
an angle formed by the second direction with respect to the first direction coincides with an angle formed by the inclination with respect to the axial direction.

6. A rotor set, comprising:
the removal device for a turbine blade according to claim 1 ;
a rotor shaft; and
a plurality of turbine blades attached to an outer circumferential side of the rotor shaft,
wherein each of the plurality of turbine blades has a blade body extending in a radial direction with respect to the rotor shaft and forming a blade profile, and a blade root installed inside the blade body in the radial direction,
a blade root groove recessed from the outside in the radial direction toward the inside in the radial direction, extending in an inclination direction that forms an acute angle with respect to an axial direction in which the rotor shaft extends, and into which the blade root is inserted, is formed in the rotor shaft,
an angle formed by the second direction with respect to the first direction coincides with an angle formed by the inclination direction with respect to the axial direction,
the removal device has a second rod guide in addition to a first rod guide that is the rod guide, and
the second rod guide has a second guide hole having a different shape from that of the guide hole of the first rod guide.

Assignees

• Mitsubishi Hitachi Power Sys
• Mitsubishi Power Ltd

Inventors

• Yoshida Shinji
• Sakaguchi Tadakazu
• OOBA Shouhei

Classifications

• F04D29/64 Primary

  of axial pumps · CPC title

• F05D2260/38

  by a spring, i.e. spring loaded or biased towards a certain position · CPC title

• F01D5/30

  Fixing blades to rotors; Blade roots {; Blade spacers} · CPC title

• F01D25/285

  Temporary support structures, e.g. for testing, assembling, installing, repairing; Assembly methods using such structures · CPC title

• F04D29/322

  Blade mountings · CPC title