Turbine rotor

Patent metadata

Field	Value
Publication number	US-9260971-B2
Application number	US-201013256151-A
Country	US
Kind code	B2
Filing date	Aug 10, 2010
Priority date	Oct 7, 2009
Publication date	Feb 16, 2016
Grant date	Feb 16, 2016

Abstract

Providing a turbine rotor in which the rotational inertia of the turbine rotor can be reduced without changing the geometry of the blade part, whereas the turbine rotor is provided with the rear side surface so that the stress concentration appearing at the root part regarding the hub part on the rear surface side is constrained in order that the strength and the durability of the turbine rotor can be enhanced. A turbine rotor that comprises a hub part 9 connected to a rotor shaft 19 and a plurality of blade parts 11 formed around the outer periphery of the hub part 9 , the hub part and the blade parts being integrated into one piece, wherein the diameter of the hub part 9 around the rotation axis L of the rotor shaft 19 gradually increases along the rotation axis direction toward a rear side surface 7 on an end side regarding the rotation axis direction; an annular recess 21 is formed annularly around the rotation axis as a rotation center line, on the side of the rear side surface 7 of the hub part 9 ; the cross-section of the annular recess whose plane includes the rotation axis is configured with a part of the major arc C of an oval shape or an egg shape, the major arc C being formed so that the oval shape or the egged shape is divided by the major axis b as a symmetrical axis of the oval shape or the egged shape; and, the major axis b is placed in the rear side surface 7.

First claim

The invention claimed is:

1. A turbine rotor comprising:
a rod-shaped hub part connected to a rotor shaft; and
a plurality of blade parts formed around an outer periphery of the hub part, the hub part and the blade parts being integrated into one piece,
wherein a diameter of the hub part gradually increases toward a rear side surface being on an end side of the hub part in a rotation shaft direction and extending in a direction perpendicular to the rotor shaft;
an annular recess and a plane area extending in the direction perpendicular to the rotor shaft are formed on the rear side surface, the plane area being located on an outer periphery side of the annular recess;
a cross-section of the annular recess in the rotation shaft direction is formed from a curve geometry divided in half by a major axis, the curve geometry being a major arc of an oval shape having a major axis diameter and a minor axis diameter symmetry with respect to the major axis;
the major axis is placed to be in line with the rear side surface;
the curve geometry being a major arc symmetry with respect to the major axis is formed in an oval; and
the minor axis diameter of the oval is 3% to 10% of the diameter of the blade part.

2. The turbine rotor according to claim 1 ,
wherein the annular recess comprises intersection points of the rear side surface with the curve geometry symmetry with respect to the major axis, and
one of the intersection points which is located at an outer periphery side is positioned at a position approximately half of a diameter of the blade part, while the other intersection point which is located at an inner periphery side is positioned at a position in a neighborhood of an intersection of the rear side surface with the rotor shaft.

3. The turbine rotor according to claim 2 ,
wherein a welding joint shelf is annularly protruded so that a front side end of the rotor shaft is welded to the welding joint shelf; and
a position of the inner periphery side is located at an intersection point of a line formed by an outer side surface of the welding joint shelf and a line formed by the rear side surface.

4. The turbine rotor according to claim 1 ,
wherein the cross-section of the annular recess is configured without a linear portion.

5. A turbine rotor comprising:
a rod-shaped hub part connected to a rotor shaft; and
a plurality of blade parts formed around an outer periphery of the hub part, the hub part and the blade parts being integrated into one piece,
wherein a diameter of the hub part gradually increases along the rotation shaft direction toward a rear side surface on an end side of the rotation shaft direction, the rear side surface extending in an orthogonal direction to the rotor shaft;
an annular recess and a plane area extending in the direction perpendicular to the rotor shaft are formed on the rear side surface, the plane area being located on an outer periphery side of the annular recess; and
a cross-section of the annular recess in the rotation shaft direction is formed from a part of either an are of a circle or a curve geometry being a major are of an oval shape or an egg shape symmetry with respect to a major axis;
further wherein a center of the are of the circle or the major axis is placed outer of the hub part than the rear side surface, the major axis being parallel to the rear side surface; and
the annular recess comprises intersection points of the rear side surface with either the arc of circle or the curve geometry symmetry with respect to the major axis; and
one of the intersection points which is located at an outer periphery side is positioned at a position approximately half of a diameter of the blade part, while the other intersection point which is located at an inner periphery side is positioned at a position in a neighborhood of an intersection of the rear side surface with the rotor shaft.

6. The turbine rotor according to claim 5 ,
wherein the cross-section of the annular recess is configured without a linear portion.

7. The turbine rotor according to claim 5 ,
wherein the curve geometry being a major arc symmetry with respect to the major axis is formed in an oval; and
a minor axis diameter of the oval is 3% to 10% of the diameter of the blade part.

8. The turbine rotor according to claim 5 ,
wherein a welding joint shelf is annularly protruded so that a front side end of the rotor shaft is welded to the welding joint shelf; and
a position of the inner periphery side is located at an intersection point of a line formed by an outer side surface of the welding joint shelf and a line formed by the rear side surface.

Assignees

• Yoshida Toyotaka
• Osako Katsuyuki
• Yokoyama Takao
• Ebisu Motoki
• Mitsubishi Heavy Ind Ltd

Inventors

• Yoshida Toyotaka
• Osako Katsuyuki
• Yokoyama Takao
• Ebisu Motoki

Classifications

• F01D5/063

  Welded rotors (welding per se B23K) · CPC title

• F01D5/026

  Shaft to shaft connections · CPC title

• F05D2230/232

  by welding · CPC title

• F01D5/048 Primary

  Form or construction · CPC title

• F05D2260/941

  particularly aimed at mechanical or thermal stress reduction · CPC title