Magnetic Patents (Class 277/302)
  • Patent number: 9322478
    Abstract: A system includes an electrodynamically suspended seal. The electrodynamically suspended seal includes a first element that includes an electrically conducting material and a second element that includes a magnetic material. At least one of the first and second elements is configured to rotate about an axial axis. The first and second elements are disposed adjacent one another. The rotational movement of at least one of the first and second elements creates a levitation force such that the first and second elements are repelled away from one another. The electrodynamically suspended seal also includes a third element configured to create a counteracting force.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: April 26, 2016
    Assignee: General Electric Company
    Inventors: Anurag Singh, Nestor Hernandez Sanchez, James Michael Fogarty
  • Patent number: 9022660
    Abstract: A rolling bearing used in a power transmission device for transmitting power such as turning force, characterized in that a magnet for holding in a lubrication portion of the rolling bearing a lubricating magnetic fluid for lubricating the lubrication portion is provided on at least one side of an outer race of the rolling bearing, and an annular yoke made of a magnetic material loosely fitted to a rotating shaft is provided on the opposite side of said magnet relative to said outer race, and a cross-sectional profile of the yoke has an I-shape.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: May 5, 2015
    Assignee: Eagle Industry Co., Ltd.
    Inventor: Shigeki Honda
  • Patent number: 8920035
    Abstract: A rolling bearing used in a power transmission device for transmitting power such as turning force, characterized in that a magnet for holding in a lubrication portion of the rolling bearing a lubricating magnetic fluid for lubricating the lubrication portion is provided on at least one side of an outer race of the rolling bearing, and an annular yoke made of a magnetic material loosely fitted to a rotating shaft is provided on the opposite side of said magnet relative to said outer race, and a cross-sectional profile of the yoke has an I-shape.
    Type: Grant
    Filed: October 16, 2013
    Date of Patent: December 30, 2014
    Assignee: Eagle Industry Co., Ltd.
    Inventor: Shigeki Honda
  • Publication number: 20140291935
    Abstract: A magnetic fluid seal includes a pole ring having an inner diameter, a rotatable shaft having an outer diameter, the rotatable shaft configured to extend along the inner diameter of the pole ring between an atmosphere side and vacuum side, at least one magnet coupled to the pole ring, the at least one magnet configured to emit a magnetic field having a strength and a shape, and grooves formed on either the inner diameter of the pole ring or the outer diameter of the shaft, the grooves capable of containing ferromagnetic fluid. The ferromagnetic fluid contained the grooves varies so as to improve the performance of the magnetic fluid seal.
    Type: Application
    Filed: April 2, 2013
    Publication date: October 2, 2014
    Applicant: Rigaku Technologies, Inc.
    Inventors: David G. Mahoney, Walter Helgeland
  • Patent number: 8585295
    Abstract: A rolling bearing used in a power transmission device for transmitting power such as turning force, includes a magnet for holding in a lubrication portion of the rolling bearing. A lubricating magnetic fluid for lubricating the lubrication portion is provided on at least one side of an outer race of the rolling bearing, and an annular yoke made of a magnetic material loosely fitted to a rotating shaft is provided on the opposite side of said magnet relative to said outer race.
    Type: Grant
    Filed: July 4, 2011
    Date of Patent: November 19, 2013
    Assignee: Eagle Industry Co., Ltd.
    Inventor: Shigeki Honda
  • Patent number: 8038155
    Abstract: A non-contacting rotary face seal assembly includes a first sealing member, including a first sealing face and a first magnetic element; and a second sealing member, including a second sealing face and a second magnetic element. The first and second magnetic elements of the first and second sealing members provide a magnetic repulsion force between the first and second magnetic elements such that the magnetic repulsion force separates the first and second sealing faces before hydrodynamic or hydrostatic forces associated with rotation of the second sealing member become sufficient to prevent the first and second sealing faces from contacting.
    Type: Grant
    Filed: July 10, 2007
    Date of Patent: October 18, 2011
    Assignee: Eaton Corporation
    Inventors: Xiaoqing Zheng, Gerard M. Berard
  • Publication number: 20110248449
    Abstract: A combined sealing device for a rotary shaft, in which the combined sealing device comprises the ring (5), the left bearing (6), the left septum magnetic ring (7), a magnetic fluid sealing assembly, the right septum magnetic ring (11), and the right bearing (12) which are arranged inside a housing (18) in series, after the magnetic fluid is injected into the pole teeth of pole pieces in the magnetic fluid sealing assembly, the shaft housing is loaded into the inner hole of the above-mentioned parts, then the second end cover (15) is fixed on a housing by screw nails (16) to press the outer ring of the right bearing tightly, after that, the first end cover (14) is fixed on the shaft housing (1) by screw nails (13) to press the inner ring of right bearing tightly, so that a magnetic fluid seal is device is achieved, the left end external surface of the shaft housing is the conical surface, and the left end inner hole of the housing is the taper hole which has the same taper as the left end of shaft housing and
    Type: Application
    Filed: March 4, 2011
    Publication date: October 13, 2011
    Inventors: Decai Li, Xiaolong Yang
  • Publication number: 20100327534
    Abstract: A magnetic brush seal system for use with a rotating component and a stationary component. The magnetic brush seal system may include a brush seal for engagement with the rotating component and a magnetic system positioned about the stationary component. The magnetic system may he in communication with the brush seal so as to retract the brush seal from the rotating component.
    Type: Application
    Filed: June 26, 2009
    Publication date: December 30, 2010
    Applicant: General Electric Company
    Inventors: Shridhar R. Powar, Shubhra Bhatnagar
  • Publication number: 20100322663
    Abstract: In a device or method for sealing a shaft against penetration of a two-component toner mixture comprising magnetic carrier particles and toner particles, an annular, stationary sealing device is arranged radially at a distance of an annular gap around the shaft. The annular gap is charged with a magnetic field. The annular gap is filled with a mixture of a semi-fluid, highly viscous barrier medium and magnetic carrier particles, and wherein the mixture in the annular gap contains 40 to 85 percent by weight or 15 to 60 percent by volume of the magnetic carrier particles.
    Type: Application
    Filed: February 18, 2008
    Publication date: December 23, 2010
    Inventors: Florian Köfferlein, Mehrad Biglari
  • Publication number: 20080124199
    Abstract: An apparatus for attaching substrates is provided with a buffering member between an upper chamber and a lower chamber. The buffering member reduces a load applied to a lifting device during vacuum exhaustion of a sealing space between the chambers. Therefore, it is possible to reduce a force applied to a lifting screw and a frame supporting a chamber, thereby extending the lifetime of the substrate attaching apparatus and component replacement. Also, it is possible to increase a lower chamber supporting force of a lifting part by coupling the lifting part to an external frame with a fixing device. As the result, the lower chamber is stably fixed and thus it is possible to reduce failures in a substrate attaching process.
    Type: Application
    Filed: October 3, 2007
    Publication date: May 29, 2008
    Inventors: Jae Seok Hwang, Dong Gun Kim
  • Patent number: 7327828
    Abstract: 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 second portion extending out from the chamber. A ferrofluid seal is positioned about the rotatable shaft and positioned between the first portion and the second portion, the ferrofluid seal fluidically sealing the chamber. The ferrofluid seal assembly also includes a plurality of non-magnetic conductive elements configured to reduce an operating temperature in the ferrofluid seal assembly.
    Type: Grant
    Filed: December 14, 2006
    Date of Patent: February 5, 2008
    Assignee: General Electric Company
    Inventors: Mark A. Frontera, Aniruddha Dattatraya Gadre
  • Patent number: 7188840
    Abstract: 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 shaft and the pole piece have a plurality of trapezoidal-shaped ridges in opposing, non-contacting relationship forming the radial gap. The trapezoidal-shaped ridges have a flat top portion facing the radial gap and tapered sides that diverge away from the top portion.
    Type: Grant
    Filed: July 7, 2003
    Date of Patent: March 13, 2007
    Inventor: Zhixin Li
  • Patent number: 6899338
    Abstract: 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 second environment, a first magnetic fluid disposed at one stage of the multi-stage rotary seal that faces the first environment, and a second magnetic fluid disposed at another stage of the multi-stage rotary seal that faces the second environment.
    Type: Grant
    Filed: March 6, 2003
    Date of Patent: May 31, 2005
    Assignee: Ferrotec USA Corporation
    Inventors: Zhixin Li, Kuldip Raj
  • Publication number: 20030141667
    Abstract: An exhaust apparatus for a differential exhaust mechanism having a labyrinth seal and a plurality of vacuum pockets includes a differential exhaust system for evacuating the vacuum pockets and an exhaust system for evacuating a chamber of exhaust gas. The differential exhaust system and the exhaust system are connected by control valves that can be opened and closed, enabling communication between the vacuum pockets and the interior of the chamber to be opened and closed (or connected and disconnected) as well. The valves are opened when a vacuum is being formed inside the chamber or when a malfunction occurs in the exhaust system, thus connecting the vacuum pockets and the chamber and preventing excessive pressure from building up on the hydrostatic bearing.
    Type: Application
    Filed: January 28, 2003
    Publication date: July 31, 2003
    Applicant: Canon Kabushiki Kaisha
    Inventors: Keiji Emoto, Katsunori Onuki
  • Patent number: 5876037
    Abstract: 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 surroundings. The device includes a pole piece 1 formed with a step portion 13 whose front end surface 4 is disposed more inwardly than the proximal end surface, and the surface of the step portion 13 opposed to a magnetic body 6 serves as a barrier wall 10. Thereby, magnetic fluid 7 is prevented from flowing out or spattering into the surroundings.
    Type: Grant
    Filed: November 19, 1996
    Date of Patent: March 2, 1999
    Assignee: Ferrotec Corporation
    Inventors: Hirohisa Ishizaki, Sirou Tsuda
  • Patent number: 5826885
    Abstract: 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 shaft are dynamically sealed by a magnetic seal which uses a thin walled pole piece, a high power magnet and magnetic fluid. The pole piece and an extension thereof form a vacuum envelope for the remainder of the device, eliminating the need for the usual O-ring static seals.
    Type: Grant
    Filed: October 2, 1996
    Date of Patent: October 27, 1998
    Assignee: Rigaku/USA, Inc.
    Inventor: Walter Helgeland
  • Patent number: 5799951
    Abstract: 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 least one liquid metal ring and a shield means which prevents contamination of the metal ring by gases coming into contact with the liquid metal. Magnetic fluid seal, a ring of an oil material, or inert gas may be used as a shield to protect the liquid metal.
    Type: Grant
    Filed: November 21, 1996
    Date of Patent: September 1, 1998
    Assignee: Varian Associates, Inc.
    Inventors: Weston A. Anderson, John E. Richardson