| 摘要 |
<p>In a capacity-adjustable screw compressor unit (1), a thrust force caused by a reaction force of gas can be appropriately cancelled by a balance piston (14). A screw compressor unit (1) of the present invention includes a compressor, having a pair of male and female screw rotors (4) meshing with each other contained in a casing (2), for compressing sucked gas and discharging it, a balance piston (14) for pressing a rotor shaft (9) acting as a rotating shaft of at least one of the screw rotors (4) in an axial direction by a fluid pressure, a slide valve (8) for adjusting capacity of the compressor (1), and a balance piston control device (22) for adjusting pressure of a fluid applied on the balance piston (14) according to the capacity of the compressor calculated from a position of the slide valve (8).
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