The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 01, 2007
Filed:
Aug. 12, 2002
Applicants:
Koji Kotani, Tokyo, JP;
Kazuo Takeda, Tokyo, JP;
Haruo Miura, Tokyo, JP;
Inventors:
Assignee:
Hitachi Industries Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04D 27/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A turbo-compressor being driven by an electric motor has an inlet guide vane and a blow-off valve. The surge limit line of the compressor is amended depending upon seasonal changes of temperature and pressure of a working gas to be sucked into the compressor. Upon the basis of the surge limit line amended, the minimum opening of the inlet guide vale is altered, thereby reducing the driving power or force of the compressor.