SCREW COMPRESSOR

• Main Authors: TOJO KENJI, YONEMOTO RYUICHIRO, IIZUKA YASUNARI
• Format: Patent
• Language: English
• Published: 21.02.2008
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTMACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTPUMPS; WEAPONS

PROBLEM TO BE SOLVED: To provide efficient operation as a screw compressor for a screw chiller. SOLUTION: The screw compressor is for the screw chiller, and it is provided with a pair of screw rotors, a housing housing the pair, a capacity control valve capable of varying a capacity ratio, a motor driving the screw rotors, and an inverter capable of varying a rotational frequency of the motor. In the screw compressor, control is carried out by singularly using or using both of a rotation frequency control means by the inverter in response to a load and a mechanical capacity control means by the capacity control valve, a maximum efficiency point is set to a lower rotational frequency side than a rated driving point when carrying out singular capacity control by the inverter, and control by only the inverter is carried out until a higher rotational frequency side than a rated rotational frequency in an area of a higher rotational frequency than the maximum efficiency point. COPYRIGHT: (C)2008,JPO&INPIT