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. 25, 2008
Filed:
Apr. 17, 2003
Hiroshi Hasegawa, Toyonaka, JP;
Fumitoshi Nishiwaki, Nishinomiya, JP;
Hiroshi Hasegawa, Toyonaka, JP;
Fumitoshi Nishiwaki, Nishinomiya, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A high-efficiency vane rotary expander is provided, which prevents a loss due to incomplete expansion or overexpansion from occurring because the volume of an operating chamber may vary. This is done by forming a plurality of discharge ports () in an inner wall () of a cylinder in the circumferential direction, placing, among these discharge ports, the discharge port (), to which the operating chamber () connects at the initial stage of the discharging process, at a position of {180×(1+1/n)} degrees from a small clearance () defined between the cylinder () and the rotor () in the direction where a shaft rotates, and providing a valve mechanism ().