Title:
CAPACITY CONTROLLER FOR INVERTER-DRIVEN SCREEN COMPRESSOR
Document Type and Number:
Japanese Patent JP3261430
Kind Code:
B2
Abstract:
PURPOSE: To provide the compressed air always having a constant pressure independently of the variation of the used air quantity by detecting the pressure of the compressed air discharged from a screw compressor and calculating the output revolution speed of an inverter so that the variation for the set value of the detection value becomes min.
CONSTITUTION: A screw compressor 1 is equipped with a drive side rotor 2 and a driven side rotor 3, and further connected in succession with an oil separator 6 and oil coolers 7 and 8 through discharge pipes 14 and 17. Further, a suction throttle valve 10 is arranged in a suction pipe 12, and a solenoid valve 11 is arranged at the edge part of an operating pipe 18 branched from the discharge pipe 14. The suction throttle valve 10 is opened and closed according to the revolution speed signal of an inverter 19 and the compressed air in the discharge pipe 14. In this constitution, the pressure detection value of a pressure sensor 21 installed in a discharge pipe 15 and the set pressure value are compared by a PID controller 20. Accordingly, the output revolution speed of the inverter 19 is calculated so that the pressure difference between both becomes min.
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Inventors:
Kazuaki Shiiki
Daisuke Torigoe
Daisuke Torigoe
Application Number:
JP23030892A
Publication Date:
March 04, 2002
Filing Date:
August 28, 1992
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
F04C18/16; F04C28/08; (IPC1-7): F04C18/16; F04C29/10
Domestic Patent References:
| JP6131687A | ||||
| JP450487A | ||||
| JP2264190A | ||||
| JP6240290U | ||||
| JP4193U |
Attorney, Agent or Firm:
Masami Akimoto