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:
Nov. 30, 1999
Filed:
Jun. 30, 1997
Kenji A Kingsford, Devore, CA (US);
Hy Ba Nguyen, Upland, CA (US);
Furon Company, Laguna Niguel, CA (US);
Abstract
A magnetically-driven centrifugal pump comprises a pump body having a pump chamber extending therein from a pump body open end to a pump body closed end, and includes a liquid inlet port and a liquid outlet port for accommodating passage of liquid to and from the pump chamber. An outer magnet assembly is disposed concentrically around the pump chamber and attached to a drive means. An inner magnet assembly is disposed within the pump chamber and is mounted to a shaft that is rotatably mounted within the pump chamber. An impeller is attached to the inner magnet assembly and is mounted to the shaft. Together, the shaft, inner magnet assembly and impeller are rotated within the pump chamber by magnetically coupling with the outer magnet assembly. A diaphragm is disposed within the open end of the pump body and is positioned adjacent the impeller. The diaphragm includes a sleeve that extends radially therefrom and is adapted to form a leak-tight seal with the pump body without the use of O-ring seals. The diaphragm sleeve facilitates axial displacement of the diaphragm relative to the pump body to adjust the spatial distance between the impeller and diaphragm to zero tolerance after the pump has been assembled. Such adjustment feature minimizes pressurized liquid bypass from an impeller cavity of the pump, and maximizes pump output pressure and pump efficiency. The pump includes means for axially displacing the diaphragm, and fixing the axial displacement of the diaphragm, to achieve a determined pump output pressure after the pump has been assembled.