CENTRIFUGAL COMPRESSOR AND FABRICATING METHOD THEREOF
Provided is a centrifugal compressor. In the centrifugal compressor, a plurality of sub-compressors each of which includes an impeller are connected in parallel to increase a compression capacity, the plurality of sub-compressors are each assembled to a single common shaft that is rotated by a driving unit, and the impellers of the plurality of sub-compressors are disposed in opposing directions. The centrifugal compressor reduces a production cost, and cancels thrusts during driving so as to reduce a loss of a bearing, thereby increasing efficiency of the compressor.
1 . A centrifugal compressor comprising:
a plurality of sub-compressors each of which includes an impeller and which are connected in parallel to increase a compression capacity,
wherein the plurality of sub-compressors are each assembled to a single common shaft that is rotated by a driving unit, and
the impellers of the plurality of sub-compressors are disposed in opposing directions.
2 . The centrifugal compressor according to claim 1 ,
wherein the plurality of sub-compressors each include casings provided along a longitudinal direction of the common shaft, and
each of the casings may be joined to or separated from the adjacent casing by a fastening member.
3 . The centrifugal compressor according to claim 2 , wherein a sealing member is provided for maintaining sealing between the plurality of sub-compressors or between the sub-compressors and the driving unit.
4 . The centrifugal compressor according to claim 3 , wherein the sealing member is a labyrinth seal.
5 . The centrifugal compressor according to claim 2 ,
wherein each of the casings is provided with an inlet port through which a compressible medium flows in, and
each of the inlet ports is formed in a longitudinal direction or a lateral direction of the common shaft.
6 . The centrifugal compressor according to claim 5 , wherein an inlet guide vane for controlling an inflow is provided on a side of the inlet port.
7 . The centrifugal compressor according to claim 1 ,
wherein the common shaft penetrates through the plurality of sub-compressors and extends outwards, and
an extending part of the common shaft receives an output from the driving unit.
8 . The centrifugal compressor according to claim 7 ,
wherein a pinion gear which receives an output from the driving unit is fixed to the extending part of the common shaft, and
a journal supported by a bearing is fixed to an end portion of the common shaft.
9 . A fabricating method of a centrifugal compressor, comprising:
providing a common shaft;
sequentially assembling a plurality of sub-compressors along an axial direction of the common shaft;
assembling a power transmission unit to one end portion of the common shaft; and
connecting the power transmission unit to a driving unit.
10 . The fabrication method according to claim 9 , wherein, in said assembling of the plurality of sub-compressors, impellers of the plurality of sub-compressors are arranged in opposing directions.