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. 15, 2025
Filed:
Sep. 30, 2022
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD., Tokyo, JP;
Abstract
A male rotor of a screw compressor has a cooling flow path extending in an axial direction inside a discharge-side shaft section. A groove structure is provided at at least a part of a region on a wall surface of the cooling flow path between the position of a discharge-side end face of the male rotor and a mounting position of a discharge-side bearing. The groove structure includes grooves or a groove that has a lengthwise component in a circumferential direction of the screw rotor and that are spaced apart in the axial direction. A nozzle which is a stationary member is arranged inside the cooling flow path with a gap between the nozzle and the wall surface of the cooling flow path. The nozzle is arranged in such a manner as to overlap at least a part of the groove structure in the axial direction.