Title:
OIL-COOLED SCREW COMPRESSOR AND CONTROL METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2017/029937
Kind Code:
A1
Abstract:
An oil-cooled screw compressor 2 equipped with a control device having: a calculation unit 36 that calculates a remaining moisture amount Dr on the basis of at least a suction temperature Ts, a suction pressure Ps, a discharge temperature Td, and a discharge pressure Pd; an inverter control unit 32 that compares a first rotational frequency of a motor 14 at which the remaining moisture amount Dr reaches a target moisture amount and a second rotational frequency of the motor 14 at which the discharge pressure Pd reaches a target pressure, and controls an inverter 16 so as to drive the motor 14 at the greater rotational frequency; and an air release valve control unit 34 that opens an air release valve 12 when the motor 14 is driven at the first rotational frequency and the discharge pressure Pd is exceeding an air release pressure. By means of this oil-cooled screw compressor 2 it is possible to prevent moisture from accumulating inside an oil separation/recovery device, and to immediately begin to supply the requested pressure, even when changing from a low-load state in which the requested pressure is low to a high-load state in which the requested pressure is high.
Inventors:
FUJIWARA YUICHI
Application Number:
PCT/JP2016/071408
Publication Date:
February 23, 2017
Filing Date:
July 21, 2016
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
International Classes:
F04B39/16; F04C18/16; F04C29/12
Foreign References:
| JP2015045323A | 2015-03-12 | |||
| JP2014222111A | 2014-11-27 | |||
| JP2014047652A | 2014-03-17 |
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (JP)
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