| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 277410000 | Magnetic | 19 |
| 20080211193 | Self-cooling ferrofluid seal - A method of cooling a ferrofluid seal that includes moving air from an atmospheric side of the ferrofluid seal over one or more heat dissipating surfaces within the ferrofluid seal through an air path formed in the ferrofluid seal by incorporating one or more vent openings in a housing case and one or more fan blades on a surface selected from the group consisting of an outside surface of a shaft and an inside surface of the housing case where the space surrounding the shaft communicates with the one or more vent openings and where the moving air is caused by the rotation of the surface having the one or more fan blades. | 09-04-2008 |
| 20090115137 | Magnetic Fluid Sealing Device - A magnet is embedded in an outer rotational shaft provided in a bearing hole of a case, and an outer magnetic circuit and an inner magnetic circuit are formed on the outer peripheral surface and inner peripheral surface of the outer rotational shaft, respectively. In a magnetic fluid seal device, magnetic fluid is filled in minute gaps coming in contact with the outer peripheral surface and inner peripheral surface of the outer rotational shaft, and the two rotational shafts can be strongly sealed by the magnetic circuits formed by a magnet. As a result, the rotational shafts can be rotated while supported in a non-contact style. In addition, the dimension can be reduced, and the number of parts can be reduced. | 05-07-2009 |
| 20090127794 | MAGNETIC FLUID SEAL WITH PRECISE CONTROL OF FLUID VOLUME AT EACH SEAL STAGE - 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. | 05-21-2009 |
| 20100025935 | MAGNETIC FLUID SEAL WITH SHUNT ELEMENT - A magneto-fluidic seal includes a shaft, a pole piece, and a plurality of sealing fluid rings located between the shaft and the pole piece. The sealing fluid rings may be defined by the shaft and/or the pole piece and contain a ferromagnetic fluid. At least one channel having a bottom is defined by either the shaft or the pole piece. A shunt is located directly adjacent to the bottom of the channel. The thickness of the shunt is based on the energy differential in the plurality of sealing fluid rings as the fluid is displaced from one side of the sealing fluid rings to the other side of the sealing fluid rings. | 02-04-2010 |
| 20100090413 | MAGNETIC FLUID SEAL WITH CENTERING OF BEARING AND SHAFT BY COMPRESSIBLE MEMBER - The present disclosure describes a magnetic fluid sealing device having a shaft centered with respect to a magnetic structure and rolling element bearing, as well as a method for centering the shaft in the device. A compressible ring located in a groove on the shaft is used to partially fill the gap between the shaft and the rolling element bearing and to make contact with the rolling element bearing. The compressible ring aligns and centers the shaft with the rolling element bearing. A liquid locking material is added to the gap and hardened to couple the shaft and compressible ring to the rolling element bearing. An alternative self-alignment mechanism is also disclosed. | 04-15-2010 |
| 20100171271 | Magnetic Fluid Shaft-Sealing Device - A magnetic fluid shaft-sealing device includes a seal cover ( | 07-08-2010 |
| 20110062671 | SYSTEMS, METHODS, AND APPARATUS FOR PROVIDING A MAGNETIC SEAL - Embodiments of the invention can provide systems, methods, and an apparatus for providing a magnetic seal. According to one embodiment, a system having a magnetic seal can be provided. The system can include a rotary machine having a first component and a second component. A magnetic seal can be mounted to the first component and positioned relative to the second component to provide a gap between the magnetic seal and the second component. The magnetic seal can include a first magnetic element and a compliant material adapted to adjust in response to a force exerted on the magnetic seal by a second magnetic element. The second magnetic element can be mounted to the second component so that the gap between the magnetic seal and the second component can be modified in response to the force exerted by second magnetic element on the magnetic seal. | 03-17-2011 |
| 20110193292 | MAGNETIC FLUID SEALING AND PACKING RING SEALING DEVICE FOR RECIPROCATING SHAFT WITH THE PACKING RING HAVING THREE OBLIQUE MOUTHS - A magnetic fluid sealing and packing ring sealing device for reciprocating shaft with the packing ring having three oblique mouths, characterized in that the first packing ring ( | 08-11-2011 |
| 20110210519 | FERROFLUID SEALING APPARATUS WITH SMALL DIAMETER USED IN LOW TEMPERATURE - A ferrofluid sealing apparatus with small diameter used in low temperature, in which the first bearing ( | 09-01-2011 |
| 20110215532 | FERROFLUID SEALING APPARATUS FOR A RECIPROCATING SHAFT - A ferrofluid sealing apparatus for a reciprocating shaft, in which the first bearing, the first magnetism isolating rings, the first pole piece, the first O-shaped rubber seal, a magnet, the second O-shaped rubber seal, the second pole piece, the second magnetism isolating ring, and the second bearing are sandwiched between the two inner bosses of the outer casing in series, an end cover is fixed on the outer casing by means of screws so that the second bearing is pressed, there are provided with three step holes in the inner torus of the second ( | 09-08-2011 |
| 20110215533 | RECIPROCATING SHAFT'S SEALING APPARATUS COMBINED A FERROFLUID SEAL WITH A C-SLIP-RING AND A YX-SEAL-RING - A reciprocating shaft's sealing apparatus combined a ferrofluid seal with a C-slip-ring and a Yx-seal-ring, characterized in that the first O-ring ( | 09-08-2011 |
| 20120018958 | Magnetic Fluid Shaft-Sealing Device - A magnetic fluid shaft-sealing device includes an outer ring for receiving a rotary shaft to rotate therewith. A magnetic-field generating unit is mounted in an annular seal chamber of the outer ring for receiving the rotary shaft. A seal ring is mounted in the seal chamber of the outer ring and located between a magnet of the magnetic-field generating unit and an end of the outer ring. The seal ring includes inner and outer peripheries spaced in a radial direction. A lip extends from the inner periphery of the seal ring toward or away from the end of the outer ring and is at a non-parallel angle to the radial direction of the seal ring to form a seal around the rotary shaft. | 01-26-2012 |
| 20120306157 | Liquid Magnetic Seals in Wankel-Type Rotary Engines - This invention proposes a new way of sealing the working chambers in Wankel-type rotary engines, by using ferrofluids and magnets in place of typical metal seals. The use of ferrofluids will allow for not only a better seal, but one that is easier to maintain. | 12-06-2012 |
| 20130161910 | MAGNETIC FLUID SEAL - A magnetic fluid seal is provided, that is capable of producing a stable sealing performance by stably holding the magnetic fluid in place, even in cases when the two members become eccentric. The magnetic fluid seal includes: an annular magnetic circuit forming member | 06-27-2013 |
| 20130193647 | MAGNETIC FLUID SEAL DEVICE - A cartridge-type magnetic fluid seal device has a flanged sleeve fixed to an external peripheral surface of the radially inside member of two members and which rotates together with the inside member is provided facing a pair of magnetic pole members. A packing is disposed in an annular space formed by the radial inside of a magnetic source and the pair of magnetic pole members. The packing is provided in the annular space so as to slide on an external peripheral surface of the flanged sleeve, and a magnetic fluid seal part, the packing, and the flanged sleeve form a unit. | 08-01-2013 |
| 20150115541 | MAGNETIC FLUID SEAL - A magnetic fluid seal ( | 04-30-2015 |
| 20150316101 | SEAL DEVICE EMPLOYING MAGNETIC FLUID - {Problem} To prevent generation of mist and particulate, and prevent pressure fluctuations and reduced quality of the vacuum on the vacuum side can be prevented. | 11-05-2015 |
| 20150345643 | Shaft Seal Assembly - An illustrative embodiment of porous media shaft seal assembly may include a stator and a rotor. The rotor may be configured to rotate with a shaft, and the stator may be engaged with a housing. Porous media may be applied and/or engaged with a portion of the stator, and a seal fluid may be communicated to the porous media. A biasing member may be employed to urge a portion of the rotor toward a portion of the stator, and seal fluid exiting the porous media may counteract the force of the biasing member. | 12-03-2015 |
| 20150377362 | Sealed Bearing Assembly - A sealed bearing assembly comprises an inner magnetic ring and an external magnetic ring to magnetically attract ferrofluid to block liquids or gases. The sealing can be maintained when a shaft is in a linear movement relative to a shell, and the sealed bearing assembly is under stringent conditions. | 12-31-2015 |
