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:
Nov. 19, 2019
Filed:
Sep. 24, 2015
Applicant:
Kobe Steel, Ltd., Hyogo, JP;
Inventors:
Yoshio Yano, Hyogo, JP;
Toshiyuki Miyatake, Hyogo, JP;
Assignee:
Kobe Steel, Ltd., Hyogo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04C 27/02 (2006.01); F04C 18/16 (2006.01); F04B 39/00 (2006.01); F04C 29/00 (2006.01); F04C 27/00 (2006.01);
U.S. Cl.
CPC ...
F04C 18/16 (2013.01); F04C 27/005 (2013.01); F04C 29/00 (2013.01);
Abstract
The oil-free screw compressor includes: a casing having a rotor chamber; a bearing supporting rotary shafts of screw rotors; a shaft seal device with an oil seal portion and an air seal portion; a ventilation gap positioned between the oil seal portion and the air seal portion; and an atmosphere open passage communicating an atmosphere side of the casing with the ventilation gap communicate. A most narrowed portion, an air seal portion, and oil seal portions are set such that the followings is established:()/()>|2|/Δ