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1. A screw compressor, comprising:
a screw rotor having a plurality of helical grooves formed therein, the helical grooves forming a compression chamber; a casing having a cylinder portion with the screw rotor inserted therein; an economizer circuit configured to eject intermediate pressure refrigerant into the compression chamber in a course of compression; an economizer sleeve including
a smaller-diameter pipe portion attached to the cylinder portion and communicating with the interior of the compression chamber, anda larger-diameter pipe portion formed in a shape of a cylinder, the larger-diameter pipe portion haying a diameter larger than a diameter of the smaller-diameter pipe portion, and the larger-diameter pipe portion having an end connected to the smaller-diameter pipe portion and an other end open to an exterior of the casing; and an economizer flange having a fitted pipe portion fitted into an interior of the larger-diameter pipe portion, and a flange portion extending radially outwardly from an end of the fitted pipe portion, the economizer circuit including
a branch passage configured to branch the intermediate pressure refrigerant from a portion of a refrigerant circuit that circulates refrigerant and performs a refrigeration cycle,a resonance space connected to a downstream side of the branch passage to retain the intermediate pressure refrigerant, anda resonance passage haying an end communicating with an interior of the compression chamber, and an other end communicating with an interior of the resonance space, the resonance passage being defined by the smaller-diameter pipe portion of the economizer sleeve, the branch passage being defined by the fitted pipe portion of the economizer flange, and the resonance space being a space formed by an inner surface of the larger-diameter pipe portion of the economizer sleeve, and the fitted pipe portion of the economizer flange. |
