Title:
スクリュー圧縮装置とその運転制御方法
Document Type and Number:
Japanese Patent JP4415340
Kind Code:
B2
Abstract:
In a capacity control method for an oil-free screw compressor, when an air consumption is larger than a set amount, a rotation frequency of a motor using an inverter to drive the compressor is set to be variable. When the air consumption is a set air amount or less, the inverter is controlled in such a manner that the rotation frequency of the motor is kept at a constant value. In this state, when an operation gas pressure of the compressor reaches an upper-limit value, an air release valve is opened to discharge the operation gas to the atmosphere. Additionally, the rotation frequency of the motor is lowered to a lower-limit value. Re-compression in the compressor can be prevented, and a compressor drive torque is lowered.
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Inventors:
Hiroshi Ota
Yukazu Aoki
Hiroyuki Matsuda
Hitoshi Nishimura
Yukazu Aoki
Hiroyuki Matsuda
Hitoshi Nishimura
Application Number:
JP2000165444A
Publication Date:
February 17, 2010
Filing Date:
June 02, 2000
Export Citation:
Assignee:
Hitachi Industrial Equipment Systems Co., Ltd.
International Classes:
F04C28/28; F04B49/06; F04C18/16; F04C28/00; F04C28/06; F04C28/08; F04C28/24
Domestic Patent References:
| JP2000097186A | ||||
| JP11257238A | ||||
| JP58112490A |
Attorney, Agent or Firm:
Hirotsugu Yoshioka
Yasuo Sakuta
Yasuo Sakuta