Compressor having cooling passage integrally formed therein

A compressor for compressing fluid comprising:

• a rotor housing forming a rotor chamber therein;
• a pair of rotors, each having a rotor shaft, contained in the rotor chamber;
• a gear housing connected to the rotor housing, the gear housing forming a gear chamber containing lubricant therein;
• a driving mechanism for driving the pair of rotors in synchronism with each other, the driving mechanism being disposed in the gear chamber;
• an inlet port for introducing fluid into the rotor chamber and an outlet port for delivering fluid compressed in the rotor chamber to outside, the inlet port being formed in the rotor housing at a position far from the driving mechanism and the outlet port being formed in the rotor housing at a position close to the driving mechanism:
• and
• a first cooling water passage for circulating cooling water therethrough, the first cooling water passage being formed in a wall of the gear housing, wherein:
• the lubricant contained in the near chamber and the compressed fluid delivered from the outlet port are cooled by the cooling water flowing through the first cooling water passage.