SCREW FLUID MACHINE PROVIDED WITH FLOW DIVIDING PORT

PURPOSE:To obtain two fluids different in pressure from one machine by providing a branch port for putting a tooth space in the communicating stae in the process of compression on a casing of a screw fluid machine. CONSTITUTION:One pair of a male rotor 3M and a female rotor 3F are supported through a suction side bearing 4 and a discharge side bearing 8, a suction port 2 is formed on the suction side casing 1, a discharge port 5 is formed on the end surface of the suction side casing 1 side of the discharge side casing 7, that is, one side of the discharge end surface 7a, and a branch port 6 is formed on the other side. Thus, when the male rotor 3M is rotated, if one tooth space (a) opens the branch port 6, a fluid of designated pressure is jetted to decrease the volume of the tooth space (a). When a designated flow is discharged, the branch port 6 is closed, and a fluid remaining in the tooth space (a) is compressed and discharged from a discharge port 21. Thus, two different pressure fluids are discharged from the discharge port 5 and the branch port 6.