Axial Compressor

Abstract

An axial compressor includes: a spray nozzle ( 32 ) that supplies droplets to a working fluid before compression or being compressed; a variable stator vane ( 56 ) having a stem section ( 94 ) inserted in an insertion hole ( 73 ) in a casing ( 54 ), the variable stator vane ( 56 ) having an angle of attack varied through sliding motion relative to the casing caused by rotation of the stem section; a sealing groove ( 93 ) provided in a sliding portion between a thrust washer ( 82 ) slid relative to the casing during rotation of the stem section and the casing; and a sealing member ( 92 ) housed in the sealing groove.

What is claimed is: 
     
         1 . An axial compressor comprising:
 a droplet supply unit that supplies droplets to a working fluid before compression or being compressed;   a variable stator vane having a rotational shaft inserted in a hole in a casing, the variable stator vane having an angle of attack varied through sliding motion relative to the casing caused by rotation of the rotational shaft; and   a sealing structure provided in a sliding portion between the casing and a member slid relative to the casing during rotation of the rotational shaft.   
     
     
         2 . The axial compressor of  claim 1 , further comprising:
 a stator vane base provided in the variable stator vane so as to be positioned between the rotational shaft and a vane section of the variable stator vane, the stator vane base being disposed to face an inner peripheral surface of the casing, wherein   the sealing structure is provided in a sliding portion between the stator vane base and the casing.   
     
     
         3 . The axial compressor of  claim 1 , further comprising:
 a stator vane base provided in the variable stator vane so as to be positioned between the rotational shaft and a vane section of the variable stator vane, the stator vane base being disposed on a side of an inner peripheral surface of the casing; and   a washer inserted over the rotational shaft so as to be positioned between the stator vane base and the inner peripheral surface of the casing, wherein   the sealing structure is provided in the casing, at a site that faces a surface of the washer on an outside in a rotor radial direction.   
     
     
         4 . The axial compressor of  claim 1 , further comprising:
 a stator vane base provided in the variable stator vane so as to be positioned between the rotational shaft and a vane section of the variable stator vane, the stator vane base being disposed on a side of an inner peripheral surface of the casing; and   a washer inserted over the rotational shaft so as to be positioned between the stator vane base and the inner peripheral surface of the casing, wherein   the sealing structure is provided in the stator vane base, at a site that faces a surface of the washer on an inside in the rotor radial direction.   
     
     
         5 . The axial compressor of  claim 1 , further comprising:
 a counterbored groove formed around the rotational shaft in an outer peripheral surface of the casing; and   a flange portion housed in the counterbored groove, wherein   the sealing structure is provided at a sliding portion at which the flange portion slides relative to the rotational shaft.   
     
     
         6 . The axial compressor of  claim 1 , wherein the sealing structure is provided in a sliding portion between the member slid relative to the casing and a lower half side of the casing. 
     
     
         7 . The axial compressor of  claim 1 , wherein the sealing structure is provided in a portion having pressure of a working medium higher than atmospheric pressure near the casing. 
     
     
         8 . An axial compressor comprising:
 a variable stator vane having a rotational shaft inserted in a hole in a casing, the variable stator vane having an angle of attack varied through sliding motion relative to the casing caused by rotation of the rotational shaft; and   a sealing structure provided in a sliding portion between the variable stator vane and the casing.