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:
Jul. 07, 2020
Filed:
Mar. 31, 2015
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Makoto Yuki, Tokyo, JP;
Masahiko Takano, Tokyo, JP;
Hitoshi Nishimura, Tokyo, JP;
Kosuke Sadakata, Tokyo, JP;
Toshikazu Harashima, Tokyo, JP;
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Abstract
A screw compressor includes: a male rotorand a female rotorincluding a rotor tooth sectionthat has multiple helical teeth, the male rotorand the female rotorrotating in engagement with each other; a casingincluding a main casingwith a boreformed to accommodate the male rotorand the female rotor, and a discharge-side casingclosing a discharge side of the bore; and a discharge passageincluding a discharge portthat opens in a rotational axis direction of the male rotorand the female rotoron a bore side surface of the discharge-side casing, compressed gas flowing from the discharge portcirculating in the discharge passage. The male rotorand the female rotorare configured such that a discharge-side end surfaceof the rotor tooth sectionserves as a discharge-side distal end of the male rotoror the female rotorin the rotational axis direction. The discharge passageincludes an enlarged flow passage sectionformed such that the enlarged flow passage sectionextends from the discharge portin the rotational axis direction of the male rotorand the female rotorand that a flow passage cross-sectional area is gradually enlarged from the discharge portto a downstream side in a compressed gas flow direction.