Electric rotating machine

Abstract

Hydrogen gas is circulated to cool an electric rotating machine main body, and brush seals are provided to contact a predetermined position on the outer circumferential surface of a rotating shaft. As a result, contact of a sealing oil and the hydrogen gas, contact of a lubricating oil and the sealing oil in the bearing, and leakage of the hydrogen gas outside the machine are prevented.

1 . An electric rotating machine comprising: 
 a bearing device which rotatably supports a rotating shaft configures a rotor inside a frame which contains an electric rotating machine main body;    a cooling medium system which supplies a cooling medium within the frame to cool the electric rotating machine main body;    a brush holder which is mounted on at least one of inner and outer part of the frame, and forms a predetermined storage space by surrounding the outer circumferential side of the rotating shaft;    a brush sealing mechanism main body which comprises: a circular ring shaped brush seal which is in the brush holder and contained such that a plurality of stages are formed in the axial direction of the rotating shaft, each stage contacting the rotating shaft; and a support portion for supporting the brush seal at each of the reverse rotating shaft sides, each of the brush seals having a plurality of divisions in the radial direction along the axial direction, the position of the division of each stage of adjacent brush seals being offset, and no cooling medium in the frame leaking to the outer portion of the frame; and    a drop prevention member which prevents the brush seal in the brush holder from dropping in the axial direction due to a pressure difference between the cooling medium and outside the frame.    
   
   
       2 . The electric rotating machine according to  claim 1 , further comprising an adjustment mechanism in which a push amount of the drop prevention member is adjustable.  
   
   
       3 . The electric rotating machine according to  claim 1 , further comprising a spacing member inside the brush holder and between the brush seals.  
   
   
       4 . The electric rotating machine according to  claim 1 , further comprising a mechanism to align the brush holder in the circumferential direction of the rotating shaft inside the frame.  
   
   
       5 . The electric rotating machine according to  claim 1 , further comprising a gap sensor which measures a gap between the brush holder and the brush and between the brush holder and the rotating shaft, wherein a displacement amount of the mechanism for automatic alignment is automatically adjusted by using an output of the gap sensor.  
   
   
       6 . The electric rotating machine according to  claim 1 , wherein brush type contact seal devices each formed of the brush holder and the brush seal mechanism main body is provided at least two locations along the axial direction of the rotating shaft, and purge oil is supplied between the brush type contact seal devices.