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:
Dec. 24, 1991
Shi Chi-Wei, Tao Yuan Hsien, TW;
Assoma, Inc., , TW;
Abstract
A centrifugal pump comprising a housing having an open end covered by a rear cover and a front cover, overlapping each other. A fixed central shaft is disposed along a central rotation axis of the centrifugal pump with a driven magnet member disposed therearound to rotate with respect thereto. The driven member is enclosed by an enclosure which is an extension of an impeller disposed within an interior space defined between the rear and front covers. The driven member is driven by a driving magnet member in fluid isolation from the driven member. The driving member is mechanically connected to a motor and actuated thereby. A bushing with internal and external cooling grooves formed thereon is provided between the fixed shaft and the driven member enclosure and a fluid passage is defined along the enclosure to conduct the pumped fluid to the cooling grooves of the bushing and to force the fluid flowing therethrough and then circulating back to the impeller so as to dissipate heat generated between the fixed shaft and the bushing. A resilient V-shaped cross section ring is provided on both ends of the bushing to absorb thrust generated by the bushing during the operation of the centrifugal pump.