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:
Oct. 12, 2021
Filed:
Dec. 08, 2017
Ebara Corporation, Tokyo, JP;
Hiroyuki Kawasaki, Tokyo, JP;
Nozomu Sasaki, Tokyo, JP;
Ebara Corporation, Tokyo, JP;
Abstract
The present invention relates to a two-stage liquid ring vacuum pump in which two-stage impellers are attached to an axial end portion of a main shaft (rotating shaft) of a motor. The two-stage liquid ring vacuum pump includes a first-stage impeller () provided in a first-stage pump chamber (), a second-stage impeller () provided in a second-stage pump chamber (), a single rotating shaft () to which the first-stage impeller () and the second-stage impeller () are fixed, and an exhaust port (Pd) of the first-stage pump chamber () and an intake port (Ps) of the second-stage pump chamber () which communicate with each other. An outer diameter of the first-stage impeller () is larger than an outer diameter of the second-stage impeller ().