| 摘要 |
In order to prevent mechanical loss from increasing at a time of injecting oil or refrigerant into a compression chamber, a screw compressor (1) is provided with a screw rotor (40) and gate rotors (50A, 50B), in which, in compression chambers (23, 23, ...) formed with helical grooves (41, 41, ...) and gates (51, 51, ...), refrigerant taken-in from a starting-end side of the helical grooves (41, 41, ...) is compressed and discharged from a dead-end side of the helical grooves (41, 41, ...). The screw compressor (1) is further provided with injection mechanisms (3, 3) for injecting oil from discharge hole (31a, 31a) thereof into the compression chambers (23, 23, ...). The injection mechanisms (3, 3) inject oil to the screw rotor (40) such that rotational torque is imparted in a direction in which the screw rotor (40) is rotated at a time of compression. |
