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Seal Configuration for a Magnetic Shaft Seal

IP.com Disclosure Number: IPCOM000044632D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Schopp, RE: AUTHOR

Abstract

The seal configuration provides for the insertion of magnetic fluid after the installation of both the shaft and the seal. The seal can be configured to permit fluid insertion either radially of axially. The seal configuration provides the flexibility of using either a stepped or straight shaft. Fig. 1 is an exploded view of a C-shaped magnet with washer-like pole pieces that illustrates a seal configuration for radial fluid insertion. Fig. 2 illustrates the radial fluid-insertion seal configuration installed in a housing. The C-shaped magnet is rotationally aligned to a fill hole in the housing so that a precision syringe can be inserted through the hole to deposit a calibrated fluid charge at the shaft. The fluid is magnetically pulled into the pole piece-shaft gaps to form two 360Πseals.

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Seal Configuration for a Magnetic Shaft Seal

The seal configuration provides for the insertion of magnetic fluid after the installation of both the shaft and the seal. The seal can be configured to permit fluid insertion either radially of axially. The seal configuration provides the flexibility of using either a stepped or straight shaft. Fig. 1 is an exploded view of a C-shaped magnet with washer-like pole pieces that illustrates a seal configuration for radial fluid insertion. Fig. 2 illustrates the radial fluid-insertion seal configuration installed in a housing. The C-shaped magnet is rotationally aligned to a fill hole in the housing so that a precision syringe can be inserted through the hole to deposit a calibrated fluid charge at the shaft. The fluid is magnetically pulled into the pole piece-shaft gaps to form two 360OE seals. The fluid does not need to be deposited on the shaft, as anywhere within the seal cavity will cause proper fluid migration. Withdrawal of the syringe and insertion of a plug blocks a potential air leak around the outside of the seal, thereby completing the assembly. Optional magnet configurations can be utilized such as with a hole through the magnet for accommodating the syringe or, as an alternative, an indented channel on the surface of the magnet for accommodating the syringe. A seal configuration for axial insertion of magnetic fluid is similar to that shown-in Fig. 1 except that the magnet is solid and one of the pole pieces...