Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Zhixin Li0
Date of Patent
March 4, 2008
0Patent Application Number
111619100
Date Filed
August 22, 2005
0Patent Primary Examiner
Patent abstract
A self-cooling ferrofluid seal includes a housing having a housing case and an external pole piece integrally connected to the housing case where the housing case has a plurality of heat dissipating surfaces, a magnetic circuit within the housing formed in conjunction with the external pole piece, a rotatable shaft having one or more fan blades where the rotatable shaft is coaxially aligned within the housing, and a quantity of magnetic fluid between the rotatable shaft and the external pole piece forming a ferrofluid seal.
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