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. 10, 1989
Filed:
May. 16, 1988
Yutaka Yamada, Tsushima-shi, Aichi-ken, JP;
Tadashi Kozawa, Oobu, JP;
Naohiro Natsume, Oobu, JP;
Hirofumi Komatsubara, Oobu, JP;
Aisan Kogyo Kabushiki Kaisha, Oobu, JP;
Other;
Abstract
A centrifugal pump of the vortex-flow type includes a pump housing defining therein an arcuate pump chamber in surrounding relationship with a central sealed chamber, and a disc-like impeller rotatably and axially movably assembled within the pump housing and having opposite end faces each forming a close clearance with a corresponding internal end wall of the pump housing between the sealed and pump chambers, the impeller having on either end face of the rim portion thereof a plurality of circumferentially equally spaced vane grooves which cooperate with the pump chamber to produce a discharge pressure therein and being formed with at least one pressure balancing hole extending axially therethrough in the interior of the sealed chamber. The impeller is formed at an intermediate annular portion thereof with a plurality of circumferentially equally spaced axial holes which are opposed to the internal end walls of the pump housing, and the internal end walls of the pump housing are each formed with an arcuate groove which is arranged in surrounding relationship with the sealed chamber and corresponds with the axial holes of the impeller.