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Title:
TURBINE CASING AND SHAFT EXPANSION DIFFERENCE DETECTING DEVICE FOR TURBINE
Document Type and Number:
Japanese Patent JP3776290
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To improve reliability of a turbine casing and shaft expansion difference detecting device of a turbine.
SOLUTION: This turbine casing and shaft expansion difference detecting device is provided with a first and second probe sensors 3, 4 for detecting each expansion of a rotating shaft 1 and a turbine easing 2 of the turbine, a differential amplifier 7 for amplifying a difference in detected output between the respective probe sensors 3, 4, a differential signal A-D converter 21 for converting the output of the differential amplifier 7 to a digital signal, a first and second A-D converters 22, 23 for converting the detected output of each probe sensor 3, 4 to a digital signal, and a microcomputer 27 for confirming for abnormality of the respective digital signals of the differential signal A-D converter 21 and the first and second A-D converters 22, 23 according to the program, and obtaining an expansion difference between the rotating shaft 1 and the turbine casing 2 according to the digital signal having no abnormality among the digital signals. Thus, the digital signal having no abnormality is selected by program processing, whereby a select switch for selecting a digital signal is not needed so as to improve reliability.


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Inventors:
Hisashi Tanaka
Takagi Yuji
Application Number:
JP2000150778A
Publication Date:
May 17, 2006
Filing Date:
May 23, 2000
Export Citation:
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Assignee:
Mitsubishi Electric Corporation
International Classes:
F01D21/00; G01B21/00; F01D21/14; F01D25/24; G01B21/16; G01B21/32; (IPC1-7): F01D21/00; F01D21/14; F01D25/24; G01B21/00; G01B21/32; //G01B21/16
Domestic Patent References:
JP1265106A
JP57119204A
JP60192805A
JP59099004A
JP54057002A
Attorney, Agent or Firm:
Keigo Murakami
Masuo Oiwa
Toshihide Kodama
Takenaka Ikuo



 
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