Screw compressor having an opening of a fluid supply portion between the compression intersection line and a trajectory line

A screw compressor comprising:

• a screw rotor;
• a casing to house the screw rotor;
• and
• a fluid supply portion to supply fluid in an atomized form into a compression chamber defined in the casing, wherein
• the screw rotor has a male and female rotors that have twisted lobes and are rotated while meshing with each other,
• the casing is formed on the inner surface thereof with a male bore in a cylindrical shape to cover the male rotor and a female bore in a cylindrical shape to cover the female rotor, and
• when an intersection line, on a higher pressure side, of the male and female bores is defined as a compression intersection line, and
• in a bore development view having the male and female bores developed on a plane, a trajectory made by a first intersection of an extension line of the lobe ridge of the female rotor and the lobe ridge of the male rotor being moved, along with the rotation of the male and female rotors, is defined as a trajectory line,
• an opening position of the fluid supply portion to the compression chamber is present only between the compression intersection line and the trajectory line.