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:
Mar. 05, 1991
Filed:
Jan. 24, 1990
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A fluid compressor includes a rotating body arranged in a cylinder to extend in the axial direction of the cylinder and eccentric thereto. A spiral groove is formed on the outer circumference of the rotating body, and a spiral blade is slidably fitted in the groove. The pitches of the groove is narrowed at a predetermined rate with a distance from a suction-side end of the cylinder to a discharge-side end of the cylider. The groove has an enlarging section which has a start point, a changeover point, and a terminal point. The enlarging section includes a first portion extending from the start point to the changeover point and having a pitch which changes at a rate smaller than the predetermined rate, and a second portion extending from the changeover point to the terminal point and having a pitch which changes at a rate larger than the predetermined rate. The space between the rotating body and the cylinder is divided by the blade into a plurality of operation chambers.