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:
Sep. 29, 2015
Filed:
Sep. 13, 2012
Hideo Hoshi, Tokyo, JP;
Syogo Nakashima, Tokyo, JP;
Yasuharu Yamamoto, Tokyo, JP;
Youko Yamamoto, Kako-gun, JP;
Takeshi Okubo, Tokyo, JP;
Tatsuya Hidaka, Tokyo, JP;
Hideo Hoshi, Tokyo, JP;
Syogo Nakashima, Tokyo, JP;
Yasuharu Yamamoto, Tokyo, JP;
Takeshi Okubo, Tokyo, JP;
Tatsuya Hidaka, Tokyo, JP;
MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo, JP;
Abstract
In a magnetic coupling pump including a closed impeller, and a casing that houses the impeller in such a way that the impeller is rotatable around a rotation axis and movable in an axis direction in which the rotation axis extends, reduction in the rotational frequency of the impeller can be suppressed even if thrust balance collapses temporarily and the impeller and the casing come into contact with each other. A tapered surface () or () is formed in at least a portion of at least one of a surface () or () of the impeller () and a surface () or () of a pump casing () that faces each other in an axis direction (Da) so that the distance between both the faces varies gradually as it goes in a radial direction (Dr) perpendicular to the axis direction (Da).