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. 18, 1980
Filed:
Jun. 06, 1979
Katsumi Matsubara, Shimizu, JP;
Shigekazu Nozawa, Shimizu, JP;
Masaharu Ishii, Shimizu, JP;
Mitsuhiko Miyagawa, Shimizu, JP;
Hitachi, Ltd., , JP;
Abstract
A screw compressor including a male rotor and a female rotor forming a pair, a rotor casing enclosing the pair of rotors and cooperating therewith to define a working chamber for compressing gas, a suction port and a discharge port formed in a suction cover and a discharge cover respectively provided to the rotor casing, a slide valve mounted at one part of the rotor casing for axial movement to return gas from the working chamber to the suction side of the compressor, a radial discharge port formed in the slide valve, and an axial discharge port formed in the discharge cover and smaller in size than the radial discharge port. The slide valve is formed therein with at least one gas flow passageway for communicating the working chamber with the discharge port only when the compressor operates in a controlled capacity mode.