| 主权项 |
1. A single screw compressor comprising:
a screw rotor including a plurality of helical grooves opened in an outer peripheral surface of the screw rotor to form fluid chambers; a gate rotor including a plurality of radially arranged gates meshing with the helical grooves of the screw rotor; and a casing containing the screw rotor and the gate rotor, each of the gates relatively moving from a start end to a terminal end of one of the helical grooves when the gate meshes with the helical groove and the screw rotor is rotated about a rotation axis in order to compress fluid in the fluid chamber formed by the helical groove, the rotation axis defining an axial direction, the casing having
a low pressure space into which uncompressed, low pressure fluid sucked into the casing flows, communicating with the start end of the helical groove opened in an end face of the screw rotor, anda divider wall covering the outer peripheral surface of the screw rotor to divide the fluid chamber formed by the helical groove from the low pressure space, with an inlet formed in the divider wall to partially expose the outer peripheral surface of the screw rotor to the low pressure space,the inlet being formed in the divider wall and disposed radially outward of the outer peripheral surface of the screw rotor relative to the rotation axis such that the low pressure fluid flows from the low pressure space into the inlet and radially inward from the inlet to the outer peripheral surface of the screw rotor partially exposed, and the fluid chamber in a suction phase into which the low pressure fluid flows from the low pressure space being divided from the low pressure space by the gate entering the helical groove after the helical groove has moved from a position where the helical groove communicates with the inlet by covering only part of the helical groove with the divider wall to a position where the helical groove is sealed from communicating with the inlet by the divider wall covering a whole part of the helical groove. |
