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Title:
TWO-STAGE SCREW COMPRESSOR AND METHOD FOR OPERATING SAME
Document Type and Number:
WIPO Patent Application WO/2017/038308
Kind Code:
A1
Abstract:
A two-stage screw compressor 2 is provided with a first-stage compressor body 4, a second-stage compressor body 6, and a control device 8. The first-stage compressor body 4 is driven by a first motor 12, the rotation speed of which is capable of being varied by a first inverter 14. The second-stage compressor body 6 is driven by a second motor 18, the rotation speed of which is capable of being varied by a second inverter 20, and is connected serially to the downstream side of the first-stage compressor body 4. The control device 8 has: a first-stage rotation speed determination section 25 that determines a first-stage rotation speed according to the required pressure; a first inverter control section 26 that controls the first inverter 14 so as to attain the first-stage rotation speed determined by the first-stage rotation speed determination section 25; a searching section 27 that determines, from among second-stage rotation speeds, an optimum second-stage rotation speed that minimizes the total power consumption of the first motor 12 and the second motor 18; and a second inverter control section 28 that controls the second inverter 20 so as to attain the optimum second-stage rotation speed. With this configuration, the two-stage screw compressor 2 is able to attain the required pressure and minimize the total power consumption.

Inventors:
TSUBOI, Noboru
NAKAMURA, Hajime
HAMADA, Katsunori
Application Number:
JP2016/071906
Publication Date:
March 09, 2017
Filing Date:
July 26, 2016
Export Citation:
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Assignee:
KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.) (2-4 Wakinohama-Kaigandori 2-chome, Chuo-ku Kobe-sh, Hyogo 85, 〒6518585, JP)
International Classes:
F04C28/08; F04C18/16; F04C23/02; H02P5/50
Foreign References:
JPH1137053A1999-02-09
JP2003513200A2003-04-08
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (AOYAMA & PARTNERS, Umeda Hankyu Bldg. Office Tower 8-1, Kakuda-cho, Kita-ku, Osaka-sh, Osaka 17, 〒5300017, JP)
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