Disclosed is a water-injection type scroll air compressor whose pre-stopping operation time for drying can be reduced while enhancing compressor efficiency. The compressor body 1 includes a water supply line 24 for supplying water to a water feeder 23 connected to an air suction line 2. The water su
Disclosed is a water-injection type scroll air compressor whose pre-stopping operation time for drying can be reduced while enhancing compressor efficiency. The compressor body 1 includes a water supply line 24 for supplying water to a water feeder 23 connected to an air suction line 2. The water supply line 24 is provided with a control valve 27 that can control a flow rate of the water. A controller 28 conducts driving control of the control valve 27 in a 5×10−5 to 40×10−5 range of an injected-water volume ratio (more specifically, a volume ratio between an intake air flow rate and injected-water flow rate in the water feeder 23 of the suction line 2) and at the same time, in an injected-water volume ratio range of the compressor characterized so that an increase rate of overall adiabatic efficiency of the compressor per 1×10−5 increase rate of the injected-water volume ratio stays less than 2% of an original or initial value.
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1. 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 wr
1. 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; anda 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. 2. A water-injection type scroll air compressor, comprising: a compressor body configured to compress air by mechanically oscillating an orbiting scroll member formed with nearly spiral wraps on both sides thereof, with respect to one pair of fixed scroll members formed with nearly spiral wraps thereon to mate with the wraps of the orbiting scroll member, anda 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. 3. The water-injection type scroll air compressor according to claim 1, further comprising: a control valve provided on the water supply line, the control valve being configured to control the flow rate of the water injected into the suction side or compression chambers of the compressor body;a temperature sensor configured to detect a discharging temperature of the compressor body;a storage element of a target range of the discharging temperature, the target range being preset such that the injected-water ratio is maintained in a range, the range including values greater than about 5×10−5 and less than about 40×10−5, and characterized so that the increase rate of the overall compressor adiabatic efficiency per 1×10−5 increase in rate of the injected-water ratio stays less than 2% of the original or initial value; anda controller configured to conduct driving control of the control valve so that the discharging temperature detected by the temperature sensor will fall within the preset range. 4. The water-injection type scroll air compressor according to claim 3, wherein the controller is adopted to increase an opening degree of the control valve when the temperature sensor detects a discharging temperature exceeding an upper-limit value of the discharging temperature target range prestored in the storage element, and to reduce the opening degree of the control valve when the temperature sensor detects a discharging temperature less than a lower-limit value of the discharging temperature target range prestored in the storage element. 5. The water-injection type scroll air compressor according to claim 2, further comprising: a control valve provided on the water supply line, the control valve being configured to control the flow rate of the water injected into the suction side or compression chambers of the compressor body;a temperature sensor configured to detect a discharging temperature of the compressor body;a storage element of a target range of the discharging temperature, the target range being preset such that the injected-water ratio is maintained in a range, the range being within the about 5×10−5 to about 40×10−5 range and characterized so that the increase rate of the overall compressor adiabatic efficiency per 1×10−5 increase in rate of the injected-water ratio stays less than 2% of the original or initial value; anda controller configured to conduct driving control of the control valve so that the discharging temperature detected by the temperature sensor will fall within the preset range. 6. The water-injection type scroll air compressor according to claim 5, wherein the controller is adopted to increase an opening degree of the control valve when the temperature sensor detects a discharging temperature exceeding an upper-limit value of the discharging temperature target range prestored in the storage element, and to reduce the opening degree of the control valve when the temperature sensor detects a discharging temperature less than a lower-limit value of the discharging temperature target range prestored in the storage element. 7. The water-injection type scroll air compressor according to claim 1, wherein in the thermally neutral seasons of fall and spring, the range of the injected-water volume ratio includes values greater than about 7×10−5 and less than about 40×10−5;wherein in the summer, the range of the injected-water volume ratio includes values greater than about 9×10−5 and less than about 40×10−5; andwherein in the winter, the range of the injected-water volume ratio includes values greater than about 5×10−5 and less than about 40×10−5. 8. The water-injection type scroll air compressor according to claim 2, wherein in the thermally neutral seasons of fall and spring, the range of the injected-water volume ratio includes values greater than about 7×10−5 and less than about 40×10−5;wherein in the summer, the range of the injected-water volume ratio includes values greater than about 9×10−5 and less than about 40×10−5; andwherein in the winter, the range of the injected-water volume ratio includes values greater than about 5×10−5 and less than about 40×10−5. 9. The water-injection type scroll air compressor according to claim 3, wherein in the thermally neutral seasons of fall and spring, the range of the injected-water volume ratio includes values greater than about 7×10−5 and less than about 40×10−5;wherein in the summer, the range of the injected-water volume ratio includes values greater than about 9×10−5 and less than about 40×10−5; andwherein in the winter, the range of the injected-water volume ratio includes values greater than about 5×10−5 and less than about 40×10−5. 10. The water-injection type scroll air compressor according to claim 4, wherein in the thermally neutral seasons of fall and spring, the range of the injected-water volume ratio includes values greater than about 7×10−5 and less than about 40×10−5;wherein in the summer, the range of the injected-water volume ratio includes values greater than about 9×10−5 and less than about 40×10−5; andwherein in the winter, the range of the injected-water volume ratio includes values greater than about 5×10−5 and less than about 40×10−5. 11. The water-injection type scroll air compressor according to claim 5, wherein in the thermally neutral seasons of fall and spring, the range of the injected-water volume ratio includes values greater than about 7×10−5 and less than about 40×10−5;wherein in the summer, the range of the injected-water volume ratio includes values greater than about 9×10−5 and less than about 40×10−5; andwherein in the winter, the range of the injected-water volume ratio includes values greater than about 5×10−5 and less than about 40×10−5. 12. The water-injection type scroll air compressor according to claim 6, wherein in the thermally neutral seasons of fall and spring, the range of the injected-water volume ratio includes values greater than about 7×10−5 and less than about 40×10−5;wherein in the summer, the range of the injected-water volume ratio includes values greater than about 9×10−5 and less than about 40×10−5; andwherein in the winter, the range of the injected-water volume ratio includes values greater than about 5×10−5 and less than about 40×10−5.
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