Patent ID: 8585376

Claim:
A water-injection type scroll air compressor, comprising: a compressor body configured to compress air by mechanically oscillating an orbiting scroll member formed with a nearly spiral wrap thereon, with respect to a fixed scroll member formed with a nearly spiral wrap thereon to mate with the wrap of the orbiting scroll member; and a water supply line configured to inject water into a suction side or compression chambers of the compressor body, wherein the water supply line conducts the injection in a range of an injected-water ratio expressed as a ratio of an injected-water flow rate to an intake air flow rate, the range including values greater than about 5×10 −5 and less than about 40×10 −5 , and characterized so that an increase rate of overall adiabatic efficiency of the compressor per 1×10 −5 increase in rate of the injected-water ratio stays less than 2% of an original or initial value.