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:
Jul. 07, 1992
Filed:
Mar. 26, 1991
Ebara Corporation, Tokyo, JP;
Abstract
A cemtrifugal pump in which the thrust generated by an impeller is balanced by the operation of a balancing disc device. In the pump, a magnetic bearing is employed as an axial thrust bearing. The distance between the surface of a balancing disc and an axial displacement detecting surface which, together with the pump shaft, and the distance between such surface of a balancing disc seat is a fixed-side member which faces the balancing disc surface. The surface of a displacement sensor is another fixed-side member which faces the axial displacement detecting surface and are made equal to each other, or the latter distance is made slightly larger than the former distance. The neutral position of the magnetic thrust bearing is made to substantially coincide with the axial position of the rotator of the pump and is determined by the balancing disc device during running of the pump. By these arrangements, the position of the stator is determined by the balancing disc device during normal operation of the pump, whereas the position is determined by the magnetic thrust bearing when the pump is at rest or in a transient running state.