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:
Feb. 09, 1993
Filed:
Jul. 02, 1990
Shinichiro Arakawa, Chigasaki, JP;
Isamu Ichiki, Yokohama, JP;
Ebara Corporation, Tokyo, JP;
Abstract
A centrifugal pump casing of a centrifugal pump, comprising a casing shell accommodating a rotary impeller therein and having as a basic circle an inner peripheral circle having a diameter greater than the diameter of the outer peripheral circle of the impeller is disclosed. A bulged portion bulged radially outwardly is integrally formed on the outer peripheral wall of the casing shell, the bulged portion extends from a starting point remote from the winding starting point of the casing shell in a circumferential direction to an end point while gradually increasing in height in the direction from the starting point to the end point. A pipe-like discharge nozzle is connected with the casing shell so that it extends between the end point where the bulged portion is highest and the winding starting point where no bulged portion is formed. In this arrangement, since the bulge height above the basic circle is not so great even at the end point where a maximum height is reached, the bulged portion can be formed through only one pressing process without the need for an annealing process. Further, the wall portion of the casing shell at the winding starting point can serve as a guide, and accordingly, a guide for discharge water which is required in the prior art may be eliminated.