Patent ID: 9732751
Date: 2017-08-15
CPC Classifications: F01C,F04C,F05C

Claim:
1. A water-lubricated screw compressor, comprising: a single pair of male/female resin screw rotors, both ends of said resin screw rotors being supported by bearings, a clearance between a discharge-side end surface of each of said resin screw rotors and a discharge-side bearing chamber being sealed by a mechanical seal, said resin screw rotors being contained inside a casing equipped with an inlet port and a discharge port; a water-supply line for supplying water into a compression chamber of said screw compressor and a slide part of each said mechanical seal, said water being retained in a water tank inside a water separator; and a discharge stream line for establishing connection between said discharge port and said water separator; wherein said water-lubricated screw compressor further comprises: a water reservoir provided at a position of said water-supply line higher than a water-supply position of said screw compressor; an entrance line into the water reservoir and an exit line out of the water reservoir extending from an upper surface of an upper portion of said water reservoir; a start-time water-supply line provided at lower portion of said water reservoir, said the start-time water-supply line being connected to said inlet port of said casing and a water-supply of said mechanical seals; and a solenoid valve provided between said water reservoir and said start-time water-supply line.