Warming structure of gas turbine rotor

• US 4,880,354 A
• Filed: 11/18/1988
• Issued: 11/14/1989
• Est. Priority Date: 11/25/1987
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd., Hitachi Power Engineering Co., Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi, Ltd., Hitachi Power Engineering Co., Ltd. (Hitachi, Ltd.)
• Inventors: Ebine, Shoji, Toriya, Hajime, Urushidani, Haruo, Teranishi, Mitsuo
• Primary Examiner(s): Powell, Jr., Everette A.
• Application Number:
  US07/272,910
• Time in Patent Office: 361 Days
• Field of Search: 416/95, 416/198 A, 416/200 A, 416/201 R
• US Class Current: 416/95
• CPC Class Codes: F01D 25/10 Heating, e.g. warming-up before starting
• CPC Class Codes: F01D 5/08 Heating, heat-insulating or cooling means specially adapted for radial flow machines or engines F01D5/04

Abstract

A gas turbine rotor warming structure comprises a tubular member having an axially extending central through hole and a plurality of fine holes formed in a side wall thereof. The tubular member is inserted in central holes of rotor disks each having blades so as to form an annular gap between the inner surfaces of the central holes and the outer surface of the tubular member. The plurality of fine holes of the tubular member are formed so as to face the inner peripheral surface of the central holse of the rotor disks, so that gas extracted from a compressor is injected into the annular gap through the fine holes and impinges on the inner peripheral surfaces of the rotor disks, whereby inner peripheral portions of the rotor disks are warmed at the time of starting of the gas turbine. The extracted compressor gas which has warmed the inner peripheral portions of the rotor disks passes between the disks and cools the turbine blades.

Claims

1. In a gas turbine rotor having a structure wherein air extracted from an air compressor at a stage of from intermediate to final stages thereof is introduced into a turbine blade of the rotor through a cooling passage formed inside the rotor,

said rotor having a warming structure comprising:

a tubular member, having a plurality of through holes arranged in an elongated side wall thereof and inserted in central holes formed in rotor disks so as to form a space between said central holes of said rotor disks and said tubular member, said plurality of through holes being formed so as to face the inner peripheral walls of said central holes of said rotor disks;

a compressor air supply passage provided to supply the extracted compressor air to said tubular member; and

an air flow passages for introducing the extracted compressor gas, having been injected to said inner peripheral walls of said rotor disks through said plurality of through holes of said tubular member, to said turbine blade.

2. A warming structure of a gas turbine according to claim 1, wherein the opposite ends of said tubular member are fitted to and supported by a front-side shaft and a rear-side shaft of the turbine rotor respectively, said compressor air supply passage including a central hole formed in said front-side shaft to supply the compressor air to said tubular member through said central hole of said front-side shaft.

3. A warming structure of a gas turbine according to claim 1, wherein one end of said tubular member is fixedly fitted in the hole formed in the disk of said rotor at a first stage and the other end of said tubular member is closed and supported by a rear-side shaft, whereby the inner peripheral wall portions of said turbine disks are warmed by the extracted compressor air passing through the inner peripheral wall portion of said first-stage disk and the extracted compressor air injected through said plurality of through holes of said tubular member.

4. In a gas turbine rotor having a plurality of rotor disks each having an inner hole, spacers each disposed between said disks, turbine blades mounted on outer peripheral portions of said disks, respectively, and front-side and rear-side shafts sandwiching therebetween and securing and disks and said spacers to form an integrated gas turbine rotor, said gas turbine rotor having a warming structure comprising

a tubular member, having an elongated central through hole and a plurality of air through holes formed in an elongated side wall, and inserted in the central holes of said rotor disks so as to form an annular air space between the inner holes of said rotor disks and an outer surface of said tubular member, said plurality of through holes of said tubular member being formed to face the inner peripheral walls of said rotor disks;

an air flow passage including said annular air passage and a radial air passage between said turbine blades for introducing all the air from said plurality of through holes of said tubular member into said turbine blades; and

a compressor air supply passage provided for supplying the extracted compressor air into said tubular member, whereby the extracted compressor air is jetted on the inner peripheral walls of said rotor disks through said elongated central through hole and said plurality of through holes of said tubular member to thereby warm the inner peripheral portions of said rotor disks at the time of starting of the gas turbine.

5. A warming structure of a gas turbine rotor according to claim 4, wherein said tubular member is supported by said front-side shaft and said rear-side shaft at ends thereof so that said tubular member is disposed coaxially of said central holes of said disks and said front-side shaft has a central hole to communicate with said elongated through hole of said tubular member.

6. A warming structure of a gas turbine rotor according to claim 4, wherein said plurality of air through holes of said tubular member are formed so that a warming effect is stronger at one of said rotor disks which has a higher stress level.

7. In a gas turbine rotor having a plurality of rotor disks arranged axially from first stage to final stage disks each having an inner central hole, spacers respectively disposed between said rotor disks, turbine blades mounted on an outer peripheral portion of each of said rotor disks, and front-side and rear-side shafts sandwiching therebetween and securing said rotor disks and said spacers to form an integrated gas turbine rotor, said gas turbine rotor having a warming structure comprising:

a hollow tubular member inserted in said inner central holes of said rotor disks;

air supply means for supplying extracted compressor air into said tubular member;

air blowing means for blowing extracted compressor air against inner peripheral surfaces of said inner central holes of said rotor disks to warm said inner peripheral surfaces of said rotor disks, said air blowing means including a plurality of fine holes formed in a side wall of said hollow tubular member so as to face said inner peripheral surfaces of said inner central holes with a gas there between;

rotor disk air passage means provided at least in each of the second stage to final stage rotor disks of said rotor disks for allowing the blown compressor air to flow from one side face to the other side face of each of said second stage to final stage rotor disks; and

air passage means for introducing compressor air passing through said rotor disk air passage means into turbine blades of at least a first stage rotor disk.

8. A warming structure of a gas turbine rotor according to claim 7, wherein said air passage means includes a space between said first stage and said second stage rotor disks and all the compressor air blown against said inner peripheral surfaces of said inner central holes passes through said space between said first and second stage rotor disks.

9. In a gas turbine rotor having a structure wherein air extracted from an air compressor at a stage of from intermediate stage to final stage thereof is introduced into turbine blades of the rotor through a cooling passage formed inside the rotor, said rotor having a warming structure comprising:

a hollow tubular member inserted in a central hole formed in said rotor so as to extend along an axis of said rotor;

a compressor air supply passage means for supplying extracted compressor air to said tubular member;

means for radially blowing the compressor air from said tubular member against an inner peripheral surface of said central hole of said rotor to warm up the inner peripheral surface of said rotor; and

means for allowing the blown compressor air to flow into said turbine blades.