Dynamically Created Seal Patents (Class 415/171.1)
  • Publication number: 20090253365
    Abstract: Various systems and apparati as well as devices and structures are provided which may be used or incorporated into air handling systems (e.g. (air) ventilation systems and apparati) for the manipulation or control of air in an enclosure such as a building, a room of a structure such as a residence, and the like. Such air handling systems may for example include a blower wheel assembly, an airflow baffle element having a fresh air path side and an opposed exhaust air path side, for the transfer of heat from warm exhaust air (taken from inside an enclosure e.g. a building) to cooler exterior fresh air (drawn into the enclosure e.g. building). The air handling systems may not only exhaust stale interior air to the outside of an enclosure but as desired or necessary also intermingle a portion of such stale air with fresh air for delivery of the intermingled air back into the enclosure (during cold or warm weather).
    Type: Application
    Filed: April 14, 2009
    Publication date: October 8, 2009
    Inventors: MARTIN GAGNON, Eric Charlebois, Michel Julien, Daniel Marcoux, Jean-Bernard Piaud
  • Patent number: 7544041
    Abstract: A pump has a one piece combined floating wear ring and liquid director that includes an upper ring portion received over an impeller hub and a curved lower portion that separates the pump impeller and suction chambers and directs liquid from the suction chamber inlet port to the impeller inlet.
    Type: Grant
    Filed: May 20, 2005
    Date of Patent: June 9, 2009
    Assignee: Wayne/Scott Fetzer Company
    Inventors: Philip A. Mayleben, Buford A. Cooper
  • Publication number: 20090092484
    Abstract: A vacuum pump includes a gas inlet, a quick-rotatable rotor connectable with a flange of a multi-chamber vacuum installation which flange has a plurality of suction openings separated by separation walls, and a gas path separating structure which is located in the gas inlet of the pump, dividing the gas inlet in suction regions, and which seals, together with the separation walls, chambers of the multi-chamber vacuum installation.
    Type: Application
    Filed: September 19, 2008
    Publication date: April 9, 2009
    Inventor: Andeas Zipp
  • Publication number: 20080262289
    Abstract: There is provided a non-contact, passively suspended blood pump that includes (a) a housing; (b) a pump rotor within the housing, wherein the pump rotor has a first end and a second end, and an axis of rotation; (c) a first axial thrust bearing across a first axial gap, between the first end and the housing, that axially suspends the first end; (d) a second axial thrust bearing across a second axial gap, between the second end and the housing, that axially suspends the second end; (e) a first radial hydrodynamic bearing that radially suspends the first end; and (f) a second radial hydrodynamic bearing that radially suspends the second end. Determining pump differential pressure by monitoring rotor axial position allows automatic physiologic control.
    Type: Application
    Filed: April 10, 2008
    Publication date: October 23, 2008
    Inventor: Michael P. Goldowsky
  • Patent number: 7387488
    Abstract: A cooled turbine shroud includes an arcuate flow path surface adapted to surround a row of rotating turbine blades, and an opposed interior surface; a forward overhang defining an axially-facing leading edge, an outwardly-extending forward wall and an outwardly-extending aft wall; opposed first and second sidewalls, wherein the forward and aft walls and the sidewalls define an open shroud plenum; at least one leading edge cooling hole extending from the shroud plenum to the leading edge; and at least one sidewall cooling hole extending from the plenum to one of the sidewalls. The flow path surface is free of cooling holes and may include a protective coating applied thereto.
    Type: Grant
    Filed: August 5, 2005
    Date of Patent: June 17, 2008
    Assignee: General Electric Company
    Inventors: Glenn Herbert Nichols, Kurt Grover Brink, Ching-Pang Lee
  • Patent number: 7338255
    Abstract: A turbo-type fluid machine comprises a mouth ring part provided between a shroud of an impeller and a pump casing and having a seal function. The mouth ring part comprises an impeller ring on a side of the shroud of the impeller and a casing ring provided on a side of a non-rotating body wall surface of the casing. The impeller ring is structured to have a stepped portion that is in the form of a staircase with at least two steps to be small in diameter toward a suction side of the impeller and large in diameter toward an outlet of the impeller. The casing ring is labyrinth-shaped to comprise a projection and a recess. A narrow clearance part having a narrow radial clearance is formed between the projection and the impeller ring. A flow passage spatial portion defining an enlarged portion of the narrow radial clearance is formed by the recess and the stepped portion of the impeller ring.
    Type: Grant
    Filed: July 6, 2005
    Date of Patent: March 4, 2008
    Assignee: Hitachi Industries Co., Ltd.
    Inventors: Shusaku Nabesaka, Sadashi Tanaka, Shinsuke Sakurai
  • Patent number: 7252474
    Abstract: A sealing arrangement for a compressor that compresses a gaseous mixture of air and fuel includes a pressurized air supply duct for supplying pressurized air into a leakage pathway defined between a compressor wheel and a housing of the compressor, which leakage pathway leads from the main gas flow path into a bearing area of the compressor, the pressurized air being supplied at a pressure sufficient to ensure that air and gaseous fuel cannot flow from the main gas flow path through the leakage pathway into the bearing area. A portion of the pressurized air flows into the bearing area, while the remainder of the air flows outwardly and is either fed back into the main gas flow path or is combined with air and gaseous fuel that leaks past an outer seal and is recirculated back to the compressor inlet.
    Type: Grant
    Filed: September 12, 2003
    Date of Patent: August 7, 2007
    Assignee: MES International, Inc.
    Inventors: Alexander Belokon, Valentina Osobova, legal representative, George L. Touchton, Victor Osobov, deceased
  • Patent number: 7238001
    Abstract: The present invention relates to a seal arrangement in which a substantially labyrinth type seal is utilised between a rotating component and a stationary component such as a housing. An edged fin of the seal arrangement incorporates a slot nozzle or a slot nozzle is associated with a fin in order that fluid flow through those slot nozzles either impinges upon opposed surfaces or at least narrows the available leakage gap width for greater sealing efficiency. Typically, several seal arrangements in accordance with the present invention and possibly in association with simple barrier fins are combined in an assembly to provide an appropriate acceptable combined operational sealing efficiency in a turbine engine.
    Type: Grant
    Filed: December 21, 2004
    Date of Patent: July 3, 2007
    Assignee: Rolls-Royce plc
    Inventor: Guy J Rushton
  • Patent number: 7175384
    Abstract: A centrifugal pump, the impeller (2) of the pump having one or more holes through the impeller adjacent to its hub. The hole or holes (7) are positioned between the vanes (3) of the impeller and closer to the hub than the periphery of the impeller. The total area of the holes is more than 0.4% of the area of the impeller, preferably 0.5-0.6% of the area of the impeller or more than 2% of the inlet area of the pump, preferably 2.5-5% of the inlet area. Preferably there is a cavity or a pit (8) at the back of the impeller.
    Type: Grant
    Filed: July 11, 2002
    Date of Patent: February 13, 2007
    Assignee: ABS Pump Production AB
    Inventor: Bengt Algers
  • Patent number: 7140839
    Abstract: A diffuser is provided having a spaced apart shroud and backing plate. A diffuser vane is provided between the backing plate and shroud. The vane includes first and second sealing surfaces opposite from one another and adjacent to the backing plate and shroud. Leading and trailing surfaces are arranged opposite from one another and adjoin the first and second sealing surfaces. The first sealing surface includes a first protrusion extending therefrom approximate to the leading surface with a gap extending from the trailing surface to the first protrusion. The second surface includes a second protrusion extending therefrom proximate to the trailing surface with a second gap extending from the leading surface to the second protrusion. The surfaces provide four corners such that the protrusions are arranged on opposite corners from one another to create a pressure differential between the first and second sealing surfaces.
    Type: Grant
    Filed: December 28, 2004
    Date of Patent: November 28, 2006
    Assignee: Hamilton Sundstrand
    Inventors: Christopher McAuliffe, Mark L. Harris, Brent Merritt, Ronald Struziak
  • Patent number: 7112035
    Abstract: In known delivery systems, a pump chamber and a revolving impeller in the pump chamber rotating about a pump axis, in which protuberances are provided inside the pump chamber on predetermined end walls, it is disadvantageous that the protuberances very and are complicated to make. In the delivery system of the invention, the friction in the pump chamber is reduced and the efficiency is improved by providing spacers, which space the impeller apart from the end walls of the pump chamber. That the protuberances are disposed in at least one ring around the pump axis.
    Type: Grant
    Filed: February 2, 2005
    Date of Patent: September 26, 2006
    Assignee: Robert Bosch GmbH
    Inventors: Hans-Joerg Fees, Reinhard Dittmann, Christoph Mittermueller
  • Patent number: 7056087
    Abstract: A rotating shaft seal assembly for a shaft supported for rotation within a housing includes a traction drive rotating a seal ring about the shaft at a speed different from the shaft. The seal ring supports a plurality of seal elements rotated at the speed different from the shaft. The reduced speed of the sealing elements and reduced pressure at each seal reduces the PV level allowing the use of known sealing materials in applications otherwise not within applicable PV levels.
    Type: Grant
    Filed: January 15, 2004
    Date of Patent: June 6, 2006
    Assignee: Hamilton Sundstrand
    Inventor: W. Clark Dean
  • Patent number: 6860483
    Abstract: The present invention relates to a seal system for use in rotary machines. The seal system includes a first member and a second member forming an annulus, a high pressure region and a low pressure region in the annulus, and a liquid seal intermediate the first and second members and intermediate the high pressure region and the low pressure region for reducing gas leakage from the high pressure region to the low pressure region.
    Type: Grant
    Filed: September 10, 2002
    Date of Patent: March 1, 2005
    Assignee: United Technologies Corporation
    Inventor: Sean McCutchan
  • Patent number: 6824350
    Abstract: A hydrodynamic sealing system for centrifugal systems comprising a double, asymmetric impeller attached to a rotary shaft, a fixed housing that surrounds the double impeller, a fluid inlet (5) in an axial direction and a fluid outlet in a radial direction with respect to the double impeller, with the double impeller defining a front side which receives the entry of fluid and a rear side close to the sealing zone of the shaft with the fixed housing. The double impeller is provided with means for taking the fluid from its front side to its rear side, so that when the double impeller rotates there arises a control of the pressure in the sealing zone, thus permitting balancing of the stresses on the double impeller and optimization of the sealing system.
    Type: Grant
    Filed: February 25, 2003
    Date of Patent: November 30, 2004
    Assignee: Careseal, S.L.
    Inventor: Antonio Pares Criville
  • Patent number: 6761034
    Abstract: A method enables a structural cover for a gas turbine engine to be manufactured. The method includes forming a torroidial body including an integrally-formed windage cover portion and a seal flange portion, and forming a plurality offastener openings extending from a forward side of the torroidial body to an aft side of the torroidial body, such that when installed in the gas turbine engine, the windage cover portion facilitates shielding the fastener openings from a gas flow path.
    Type: Grant
    Filed: June 6, 2002
    Date of Patent: July 13, 2004
    Assignee: General Electroc Company
    Inventors: David Andrew Niday, Scott Patrick Ryczek, James Patrick McGovern, Gary Charles Liotta, Gianni Busso
  • Patent number: 6629816
    Abstract: An improved oil seal is provided for sealing passage of a rotatable shaft through an end wall of a bearing housing in a turbomachine or the like, wherein the shaft is rotatably supported within the bearing housing by oil-lubricated bearings. The improved oil seal comprises a dynamic oil-air separator and a slinger rotor mounted on the shaft for rotation therewith, the slinger rotor having an outwardly extending slinger ring with an outboard seal face with radially oriented slots and a circumferential groove or grooves.
    Type: Grant
    Filed: August 16, 2001
    Date of Patent: October 7, 2003
    Assignee: Honeywell International Inc.
    Inventors: Todd A. Langston, William L. Giesler
  • Patent number: 6619908
    Abstract: A method and apparatus carrying the method for sealing a radial gap between coaxial inner and outer rotating shafts of a gas turbine engine includes using a radial seal as a main seal to seal the gap for a normal engine operation condition, and using an axial seal as a back-up seal for a double seal of the gap. The radial seal provides a seal which meets relatively restrictive leakage requirements for the normal engine operation condition and the axial seal provides a back-up seal which meets less restrictive leakage requirements but is much more tolerant of radial displacement and vibration between the coaxial inner and outer rotating shafts. Thus, an engine operable condition is ensured under abnormal conditions, such as bird strikes, in which the coaxial relationship between the inner and outer rotating shafts are affected by unbalancing forces caused by the bird strike, thereby causing a failure of the radial seal.
    Type: Grant
    Filed: September 10, 2001
    Date of Patent: September 16, 2003
    Assignee: Pratt & Whitney Canada Corp.
    Inventors: Vittorio Bruno, Andreas Eleftheriou
  • Patent number: 6595743
    Abstract: A rotary blood pump comprising at least one rotor, a housing and at least one conduit in the rotor for conducting a by-passed portion of the blood into a clearance between the rotor and the housing, the portion of blood consisting mostly of plasma without red cells, thus preserving the solid particles and red cells from damage.
    Type: Grant
    Filed: June 23, 2000
    Date of Patent: July 22, 2003
    Assignee: IMPSA International Inc.
    Inventors: Lev Kazatchkov, Lucas Varela
  • Patent number: 6511285
    Abstract: Two stages of relatively rotatable guide vanes (22,24) are arranged in tandem. Shroud portions (42,46) on the vanes overlap in loose engagement, until an associated gas turbine engine starts operating. Gas loads then act on the downstream vane stage (24) and move it in a downstream direction until the opposing flanks of radially opposing lands (44,48) on respective shrouds (42,46) engage, whereupon, gas leakage via the overlap onto the turbine casing (40) is at least substantially reduced.
    Type: Grant
    Filed: February 5, 2002
    Date of Patent: January 28, 2003
    Assignee: Rolls-Royce plc
    Inventor: Alec G Dodd
  • Patent number: 6508618
    Abstract: A pump has a housing defining a pump chamber and having a shaft opening. An impeller shaft extends through the shaft opening and is sized to define a gap between the impeller shaft and the shaft opening. An impeller is attached to the shaft inside the pump chamber. The impeller includes a first set of impeller blades for transporting fluid through the pump chamber and a second set of impeller blades for creating a pressure force which pushes fluid away from the shaft opening. The pump with sealless shaft prevents fluid from leaking through the gap, and therefore is particularly suited for use in a tank-type vacuum cleaner capable of collecting both dry material and fluid. The gap is used in such an application to prime the pump, thereby discharging fluid collected in the tank.
    Type: Grant
    Filed: February 20, 2001
    Date of Patent: January 21, 2003
    Assignee: Shop-Vac Corporation
    Inventor: Robert C. Berfield
  • Patent number: 6224322
    Abstract: In a centrifugal pump, a barrier ring in the form of a dynamic seal member is interposed between relatively rotating, generally circular wall portions which undergo relative axial movement to vary the width of a gap between the wall portions, the seal member having an outer jacket of flexible material and an annular spring member of frustoconical configuration inserted into offset grooves in the jacket, and when the seal member is mounted under compression between the confronting surfaces will follow the relative axial movement between the wall portions to maintain liquid-tight sealing engagement with the wall portions. In a modified form of invention, the seal member includes a pair of helical spring members inserted into grooves in an outer flexible jacket and, when the seal is mounted under compression between confronting surfaces of the wall portions as described will maintain liquid-tight sealing engagement notwithstanding variations in the width of the gap between members.
    Type: Grant
    Filed: November 16, 1998
    Date of Patent: May 1, 2001
    Assignee: A. R. Wilfley & Sons, Inc.
    Inventor: Gabriela E. Calboreanu
  • Patent number: 6183221
    Abstract: A heat dissipation fan as disclosed includes a heat dissipation fan blade, a self-lubricating bearing, a stator having an electrical circuit plate and a casing. The heat dissipation fan blade includes a shaft extending therefrom. The shaft has a rounded free end that and contains a neck to seat a locking plate therein. The casing has a collar extending therefrom to hold the stator in place. The collar contains a recess to securely receive the self-lubricating bearing and forms an internal shoulder to restrain and support the locking plate and the self-lubricating bearing. The locking plate is round and contains a through hole therein. The through hole has a diameter corresponding to that of the neck in the shaft. The locking plate has multiple slits formed on the periphery of the through hole. A washer is placed in the bottom of the recess and contains a hole with a diameter smaller than the shaft to abut the free end of the shaft.
    Type: Grant
    Filed: October 29, 1999
    Date of Patent: February 6, 2001
    Inventor: Hsin-Mao Hsieh