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7327828 |
Thermal optimization of ferrofluid seals
A hermetic sealing system includes a chamber enclosing a high vacuum and positioned within an ambient environment and a rotatable shaft having a first portion extending into the chamber and a...
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7188840 |
Magnetic fluidic seal with improved pressure capacity
A magnetic assembly for a multistage magnetic fluid rotary seal has a shaft, an annular permanent magnet, at least one pole piece and a radial gap formed between the shaft and the pole piece. The...
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6899338 |
Ferrofluid seal incorporating multiple types of ferrofluid
A ferrofluid seal apparatus incorporating a multi-stage ferrofluid rotary seal adapted to provide a ferrofluid pressure-type seal about a shaft element extending between a first environment and a...
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5876037 |
Magnetic fluid sealing device
A magnetic fluid sealing device for preventing magnetic fluid from flowing out or spattering under the influence of rotation of a rotatable shaft, thereby preventing contamination of the...
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5826885 |
Magnetic fluid sealing device
A magnetic fluid sealing device adapted to enable rotary motion to be coupled by a shaft between an ambient high pressure environment to a high temperature, low pressure environment. Gaps in the...
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5799951 |
Rotating sealing device
A rotating sealing device for sealing between a wall separating two mediums under substantially different pressure and a rotatable shaft utilizes a combination of a liquid meatal seal comprising at...
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5704613 |
Methods for sealing and unsealing using a magnetically permeable solid-based medium
Devices and methods employ a solid-based medium that serves as a magnetic sealant, a lubricant, a bearing, an electrical or thermal conductor, singly or in combination. Included are devices wherein...
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4527802 |
Integral magnetic fluid centrifugal high speed gas seal and method
A magnetic/centrifugal-fluid seal is characterized by a common region serving as both the magnetic gap for the magnetic seal and a fluid-receiving pool for the centrifugal seal. A magnetically...
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4506895 |
Self-activating ferrofluid seal apparatus and method of use
A low-cost, self-activating ferrofluid seal apparatus particularly useful as an exclusion seal with computer-disc-drive spindles, which seal apparatus comprises an annular, axially-polarized...
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4478424 |
Ferrofluid seal apparatus and method
A ferrofluid seal apparatus and method, which ferrofluid seal apparatus comprises at least one ferrofluid seal about the surface of a rotatable shaft, the ferrofluid retained in a sealing...
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4455026 |
Vee-shaped magnetic/centrifugal seal and method of operation
A combined magnetic/centrifugal seal for a rotating shaft rotatably journalled within a housing. The rotating shaft has a generally circular cross section and at least one radially extending...
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4444398 |
Self-activating ferrofluid seal apparatus and method
A self-activating ferrofluid seal apparatus and method, which seal apparatus comprises a permanent-magnet ring and a pair of pole pieces which form a cavity therebetween, and which seal apparatus...
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4407518 |
Nonbursting multiple-stage ferrofluid seal and system
A nonbursting ferrofluid seal apparatus and system which comprises an annular permanent magnet and annular first and second pole pieces, one end of the pole pieces defining a single-stage...
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4407508 |
Single-pole-piece ferrofluid seal apparatus and exclusion seal system
A single-pole-piece ferrofluid exclusion seal apparatus and exclusion seal system which comprises a single, annular pole piece to surround a shaft element to be sealed, and an annular permanent...
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4357024 |
Ferrofluid rotary-shaft seal apparatus and method
A ferrofluid rotary-shaft seal apparatus of extended seal life particularly adapted for use as an exclusion seal with a computer-disc-drive spindle, which seal apparatus comprises: an annular...
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4357023 |
Ferrofluid rotary-shaft seal apparatus and method
A ferrofluid rotary-shaft seal apparatus of extended seal life, particularly adapted for use as an exclusion seal with a computer-disc-drive spindle, which seal apparatus comprises: an annular...
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4340233 |
Ferrofluid seal apparatus
A ferrofluid rotary-shaft seal apparatus of extended seal life particularly adapted for use as an exclusion seal with a computer-disc-drive spindle, which seal apparatus comprises: an annular...
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4252353 |
Self-activating ferrofluid seals
A self-activating seal is formed by inserting a magnetically permeable shaft into a module which comprises: a magnet, two pole pieces and a magnetic fluid. The module is so constructed that the...
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4252328 |
Self-activating ferrofluid seal and method
A self-activating ferrofluid-seal apparatus for a memory-disc-drive shaft, which seal apparatus comprises a ring magnet and a pair of pole pieces which form a cavity therebetween, a closed loop of...
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4200296 |
Ferrofluid centrifugal seal
A ferrofluid centrifugal seal and method of sealing a rotatable shaft, wherein ferrofluid is retained in an O-ring-seal form at static and low speeds and is moved to a barrier seal in a passageway...
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