Two-stage centrifugal compressor

The present invention two stages of centrifugal compressors, a conventional two-stage centrifugal compressor are all the inner space and the first compressed portion of the compressor (C) (C The present invention is going to occur continuously with the other end of the outer body 13 through the inner space the first and second compression section of the two-stage centrifugal compressor intended to solve this problem is in one end of the outer body (13) first and second compression parts are in correspondence with the inner fluid passage 14, a plurality of inner fluid passage 14 is formed and the upper / lower bearing housing (21a, 21b) fixed to both ends of the outer body (13) at both ends of the of claim 1, 2 is formed with a compression chamber (31, 32) and coolant fluid passage (213) in circulation, and the second compression part receiving the inlet portion of the diffuser 27 in the interior of the compression casing 34, that a second compression chamber 32 is formed in the outer surface portion of the compression chamber fluid circulation in correspondence with the coolant fluid passage 213 of the upper / lower bearing housing (21a, 21b) having a refrigerant outlet (361) surrounding the external portion a two-stage centrifugal compressor, characterized in that a passage 362 is provided with an internal cover 36 is formed Provided.