Ferrofluidic seal centering ring

A ferrofluidic seal (10) is fitted with a centering ring (26) having an inner edge (31) adapted for engagement with a rotating shaft (12) for centering the seal about the rotating shaft (12). The centering ring (26) automatically engages the shaft (12) and centers the seal (10) when the seal is fitt...

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Bibliographische Detailangaben
Hauptverfasser:	HUFFORD, LARRY A, MOONEY, DAVID T, WATKINS, ROBERT C, BLACK, THOMAS J., JR, MCMAHAN, PAUL E, MRAZ, WILLIAM B
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING CYLINDERS ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HAND TOOLS HEATING LIGHTING MANIPULATORS MECHANICAL ENGINEERING PERFORMING OPERATIONS PISTONS PORTABLE POWER-DRIVEN TOOLS SEALINGS TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS THERMAL INSULATION IN GENERAL TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FORFASTENING, CONNECTING, DISENGAGING OR HOLDING TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	A ferrofluidic seal (10) is fitted with a centering ring (26) having an inner edge (31) adapted for engagement with a rotating shaft (12) for centering the seal about the rotating shaft (12). The centering ring (26) automatically engages the shaft (12) and centers the seal (10) when the seal is fitted onto the shaft (12). The centering ring (26) is affixed to the housing (100), and/or magnet and pole module (14). In one embodiment, the centering ring (26) may be removed after it performs its centering function. In another embodiment, the centering ring (26) is non-removable and remains within the seal (10) permanently. According to this latter embodiment, the centering ring (26) serves the additional purpose of retaining ferrofluid, expelled from (10) the seal during "bursting", within magnetic reach of the seal so as to be re-drawn into the seal (10), thus extending seal life. Additionally, a ferrofluid retaining ring absent a centering function may be employed. The centering ring (26) provides for easy installation and accurate centering of a seal (10) with which it is used, and yields a highly functional and operationally safe seal.