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Title:
GAS COMPRESSOR
Document Type and Number:
WIPO Patent Application WO/2019/189085
Kind Code:
A1
Abstract:
Provided is a technology which makes it possible, in a gas compressor that generates compressed gas of a set pressure by constant velocity control, to reduce more power during "unload operation control". This gas compressor is provided with: a compressor body; a drive source; an intake throttle valve; an air release valve; a rotation number conversion means; a pressure detection device for detecting ejection pressure; and a control device. The control device, when the relationship between an upper-limit pressure H and a lower-limit pressure L is H > L, performs at least one of: causing the drive source to operate at a full-speed rotation number with the intake throttle valve open and the air release valve closed, until the ejection pressure reaches H; and, when the ejection pressure has reached the pressure setting H, reducing the ejection pressure to within a predetermined range with the intake throttle valve closed and the air release valve open. The control device switches to a load operation when the ejection pressure has decreased to the lower-limit pressure L. The control device, when the ejection pressure has increased and reached the upper-limit pressure H, outputs to the rotation number conversion means a command for a rotation number smaller than the full-speed rotation number, and, when the ejection pressure has decreased and reached the lower-limit pressure L, outputs to the rotation number conversion means a command for the full-speed rotation number.

Inventors:
HASE MASAKAZU (JP)
TANAKA HIDEHARU (JP)
IYOZUMI AKIRA (JP)
TAKANO MASAHIKO (JP)
MORITA KENJI (JP)
YORIKANE SHIGEYUKI (JP)
NAKAJIMA TAKASHI (JP)
SAGAWA YOSHIHIKO (JP)
Application Number:
PCT/JP2019/012697
Publication Date:
October 03, 2019
Filing Date:
March 26, 2019
Export Citation:
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Assignee:
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD (JP)
International Classes:
F04C28/08; F04C18/16; F04C28/06
Foreign References:
JP2005016414A2005-01-20
JP2012002156A2012-01-05
Attorney, Agent or Firm:
TODA Yuji (JP)
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L, performs at least one of: causing the drive source to operate at a full-speed rotation number with the intake throttle valve open and the air release valve closed, until the ejection pressure reaches H; and, when the ejection pressure has reached the pressure setting H, reducing the ejection pressure to within a predetermined range with the intake throttle valve closed and the air release valve open. The control device switches to a load operation when the ejection pressure has decreased to the lower-limit pressure L. The control device, when the ejection pressure has increased and reached the upper-limit pressure H, outputs to the rotation number conversion means a command for a rotation number smaller than the full-speed rotation number, and, when the ejection pressure has decreased and reached the lower-limit pressure L, outputs to the rotation number conversion means a command for the full-speed rotation number."/>