Patent ID: 8147231

Claim:
A screw compressor comprising: a pair of male and female screw rotors that mesh with each other; and a compressor casing that stores said pair of screw rotors, wherein the compressor casing is divided, by dividing surfaces orthogonal to rotor shafts of said pair of screw rotors, into a rotor casing around said pair of screw rotors, a discharge casing on a side of a discharge opening, and a suction casing on a side of a suction opening, wherein said rotor casing is divided into a discharge opening neighborhood portion comprising at least said discharge opening, and a remaining rotor casing portion other than said discharge opening neighborhood portion, and is configured so that said discharge opening neighborhood portion of said rotor casing is removable from said remaining rotor casing portion of said rotor casing, whereby said suction casing and said discharge casing need not be replaced when the performance of the screw compressor is changed.