Labyrinth Patents (Class 277/412)
-
Patent number: 7604239Abstract: An assembly for sealing a rotating shaft and a bearing housing which has a stator, a rotor, and a unitizing element. The stator has at least two portions and an annular engagement flange extending in an axial direction having a groove on a radial side thereof. The rotor has at least two portions and an annular engagement flange extending in an axial direction having a groove on the radial side thereof. The annular unitizing element has at least two portions, a stator engaging member that engages the stator groove, a rotor engaging member that engages the rotor groove, and a rear member having a side edge that engages the stator. A radially outer surface of the unitizing element has two areas of differing diameter, one corresponding to the rotor engaging member and the other corresponding to the rear member.Type: GrantFiled: June 19, 2007Date of Patent: October 20, 2009Assignee: Garlock Scaling Technologies LLCInventors: Elizabeth Chitren, Christopher Tones
-
Patent number: 7597699Abstract: A motorized surgical handpiece comprises a housing enclosing an interior containing a motor and an output shaft for being driven in rotation by the motor. The output shaft has a central longitudinal axis, a bore extending therethrough for receiving a shank of a surgical tool to be rotatably driven by the output shaft, a forward end portion extending forwardly beyond the motor and a rearward end portion extending rearwardly beyond the motor. The housing has a continuous lumen extending entirely therethrough formed in part by the output shaft bore for insertion of a bore brush through the lumen for cleaning when the surgical tool is removed from the handpiece.Type: GrantFiled: July 25, 2005Date of Patent: October 6, 2009Inventor: William G. Rogers
-
Patent number: 7559554Abstract: In sealing arrangement 41 between first and second relatively rotatable bodies of a machine such as a steam turbine, a relatively high pressure p0 exists on one side of the sealing arrangement and a relatively low pressure pf exists on the other side. The sealing arrangement comprises a series of sealing elements or units S1, S2, S3, at least one of which comprises a brush seal. A seal bypassing device, preferably comprising a pressure relief valve 42-44 limits the pressure drop across the brush seal.Type: GrantFiled: April 4, 2005Date of Patent: July 14, 2009Assignee: Alstom Technology LtdInventors: Simon Ian Hogg, Karl Urlichs
-
Publication number: 20090127795Abstract: A non-contact labyrinth seal assembly, bearing assembly therewith, and method of construction thereof, has an outer rigid carrier and an inner sleeve. The carrier has an outer cylindrical flange and a radially inwardly extending leg and the sleeve has a cylindrical wall and a radially outwardly extending flange. A body is attached to at least one of the leg and the flange, wherein the body provides, at least in part, a purely non-contact labyrinth passage extending between the carrier and the sleeve.Type: ApplicationFiled: November 19, 2008Publication date: May 21, 2009Inventors: Scott B. Lattime, Kevin M. Dillon, Alicia Black, Richard Borowski, Roger Trentman, Stephen E. Brister, Carl F. Meadows, Brian M. Hupp, David G. Toth
-
Transition-to-turbine seal apparatus and kit for transition/turbine junction of a gas turbine engine
Patent number: 7527469Abstract: One embodiment of a transition-to-turbine seal (300) comprises a transition exit seal (302) adapted for fixed attachment to an exit rail (350) of a transition (109), and a stage-1 seal (340). The stage-1 seal (340) comprises an axial seal slot (348) comprising parallel walls (346, 347) adapted to slidingly engage a first male member (310) of the transition exit seal (302). The stage-1 seal (340) also comprises a radial seal slot (354) comprising parallel walls (351, 353) adapted to slidingly engage a plate (338) of a row 1 vane segment (330). The transition-to-turbine seal (300) thus provides both axial and radial freedom of movement. Materials and coatings for the transition exit seal (302) and the stage-1 seal (340) are selected to promote preferential wear of these components relative to wear of the surface of the row 1 vane segment (330). Wear of the exit rail (350) is reduced or eliminated due to the noted fixed attachment.Type: GrantFiled: December 8, 2005Date of Patent: May 5, 2009Assignee: Siemens Energy, Inc.Inventors: James M. Zborovsky, Johan Hsu, Andrew G. McQuiggan -
Patent number: 7521827Abstract: A shaft seal assembly is disclosed having a stator including a main body and axial and radial projections therefrom. The rotor is radially extended and encompasses the axial and radial projections from said stator. A passageway formed between the radial projection of stator and rotor results in an axial passageway having its opening facing rearwardly from the rotor and away from the source of impinging coolant and/or contaminant. A concentric circumferential receptor groove in the stator facing the housing allows insertion of conductive means for transmission of electrostatic charge away from the shaft through the shaft seal assembly to the housing and ground. The receptor groove is opposite the axial passageway and provides for both a substantially lower contaminant environment and improved engagement with conductive means.Type: GrantFiled: March 17, 2006Date of Patent: April 21, 2009Assignee: Isotech of Illinois, Inc.Inventors: David C. Orlowski, Thomas D. Coe
-
Patent number: 7516687Abstract: A system and method for sealing a live center is provided. The live center has a spindle disposed, at least in part, within a housing, bearings provide a rolling connection between the spindle and the housing, and a labyrinth seal is mounted to at least one of the spindle and the housing and is configured to reduce an amount of contaminant from entering the housing. A method of sealing a live center is also provided. In some embodiments of the invention, the method includes restricting a fluid path along a spindle, defining the fluid path to have a labyrinth section, providing a drain to the outside of the live center for fluid moving along the path and substantially blocking the path of the resilient seal.Type: GrantFiled: August 18, 2004Date of Patent: April 14, 2009Assignee: Riten Industries, Inc.Inventor: James Robinson
-
Publication number: 20090072488Abstract: Labyrinth seals and methods of manufacturing the seals are provided. In one embodiment, and by way of example only, the labyrinth seal includes a land including a plurality of cells, each cell including a first half of a geometric shape and a second half the geometric shape, the first half laterally offset relative to the second half.Type: ApplicationFiled: September 18, 2007Publication date: March 19, 2009Applicant: HONEYWELL INTERNATIONAL, INC.Inventors: Douglas Lyle Ramerth, Hasham Chougule, Dhinagaran Ramachandran
-
Publication number: 20090072487Abstract: Labyrinth seals and methods of manufacturing the seals are provided. In an embodiment, the seal includes a seal base and a first annular tooth. The seal base has an outer peripheral surface. The first annular tooth extends radially from the seal base outer peripheral surface. The first annular tooth includes a forward wall, an aft wall, and a tip wall, and the forward wall and the aft wall each include bottom sections that contact the seal base and angle upwardly toward or substantially parallel to each other. The forward wall has a notch formed therein defined by a shelf wall and a side wall, the shelf wall and side wall join the forward wall to the tip wall, and the aft wall is formed without a notch. The side wall and the aft wall extend substantially parallel to each other.Type: ApplicationFiled: September 18, 2007Publication date: March 19, 2009Applicant: HONEYWELL INTERNATIONAL, INC.Inventors: Hasham Chougule, Douglas Lyle Ramerth, Dhinagaran Ramachandran
-
Patent number: 7498703Abstract: A shaft sealing assembly (10) for providing a seal between a shaft and a housing within which the shaft rotates. The sealing assembly (10) comprises a rotor (40) adapted to be mounted to the shaft and a stator (42) adapted to be mounted to the housing. The rotor (40) and the stator (42) include recesses and/or projections which mate and interlock to form a labyrinth lubricant chamber therebetween. The stator (42) carries at least one electrical-path-establishing element (88) which forms an electrically conductive path between the shaft and an electrical ground to thereby dissipate residual current and/or stray shaft voltage.Type: GrantFiled: May 4, 2006Date of Patent: March 3, 2009Assignee: Parker-Hannifin CorporationInventors: Michael J. Rea, Sr., Paul E. Yager, Ronald J. Thomas, Jr.
-
Patent number: 7487588Abstract: In a process for producing leaves (20, 20?) for a leaf seal, in particular as a seal for a gas turbine, which leaves (20, 20?) are laterally delimited by a peripheral edge contour and have regions of different thicknesses (d1, d2), a simplification, without sacrificing precision, is achieved by virtue of the edge contour of the leaves (20, 20?) being cut out of a metal sheet (28) by an etching process and the regions of different thicknesses (d1, d2) also being produced simultaneously as part of the etching process.Type: GrantFiled: October 3, 2006Date of Patent: February 10, 2009Assignee: ALSTOM Technology Ltd.Inventors: Simon Ian Hogg, Nigel Anthony Rhodes, Erwin Schoenfeld
-
Publication number: 20090008881Abstract: The present invention relates to a labyrinth seal used for controlling the axial leakage rate of a working fluid by using the rotating shaft of a turbo-machine such as a compressor or turbine The labyrinth seal includes: a seal disk radially extending from a rotating shaft and being formed on the rotating shaft; a seal ring spaced apart from the seal disk and being opposed to the seal disk; an actuator for moving the seal ring to adjust a gap between the seal disk and the seal ring; and a controller for controlling an operation of the actuator. By actively adjusting the gap between the seal disk and the seal ring, it is possible to effectively prevent the working fluid from leaking.Type: ApplicationFiled: July 7, 2008Publication date: January 8, 2009Inventors: Yong Bok Lee, Chang Ho Kim, Kyoung Wook Kim
-
Patent number: 7470113Abstract: A compressor for a turbine engine includes multiple compressor disks having rotor blades mounted about the circumference of each of the disks. A plurality of stator vanes extend between the rotor blades of axially adjacent disks. A knife edge seal segment is supported by each disk backbone extending from the disks and contacts the stator vanes to restrict leakage of compressed air from between the stator vane and the compressor rotor to limit the recirculation of air. Retaining flanges extend from each disk rim to retain the knife edge seal segments to the disk backbone and spacer bridges integral to the knife edge seal segments prevent axial movement of the knife edge seal segments. A plurality of lock assemblies are spaced about the circumference of the disk backbone to prevent circumferential shifting and rotating of the knife edge seal segments during operation.Type: GrantFiled: June 22, 2006Date of Patent: December 30, 2008Assignee: United Technologies CorporationInventors: Tuy Tran, John T. Pickens
-
Publication number: 20080284109Abstract: This invention provides a seal assembly for sealing a gap between first and second relatively movable members. The first member is provided with a sealing surface, and the second member is provided with a sacrificial abradable layer that is positioned opposite the sealing surface of the first member. When the seal assembly is in operation the sealing surface of the first member moves relative to, and abrades, the abradable layer of the second member thereby maintaining a seal between the members. The present invention is characterised in that, the second member and the abradable layer comprise the same composite material. The second member and the abradable layer may be co-cured together during manufacture.Type: ApplicationFiled: March 25, 2008Publication date: November 20, 2008Applicant: ROLLS-ROYCE PLCInventor: Quinten J. Northfield
-
Publication number: 20080265513Abstract: A seal comprises the combination of a primary seal and a secondary seal each of which acts on at least one shoe that is installed with clearance relative to one of a rotor and a stator in a position to create a non-contact seal therewith. The at least one shoe is provided with a surface geometry and labyrinth-type teeth that influence the inertia of fluid flowing across the seal, and, hence, the velocity of the fluid and the pressure distribution across the seal, ultimately affecting the balance of forces applied to the seal.Type: ApplicationFiled: June 4, 2008Publication date: October 30, 2008Inventor: John F. Justak
-
Publication number: 20080246224Abstract: A bearing sealing arrangement for rotating machines uses a radially-acting labyrinth seal (2) to minimize bearing lubricant leakage and an axially-acting screw-type gasket (3) to return what fluid escapes through the labyrinth seal to the bearing (10). In embodiments, the labyrinth seal uses rings (4) with plastic wear surfaces formed about internal metal bands, the plastic forming corresponding profiles on the ends (27,28) of the bands so that the profiles interlock when overlapped to form the rings. The screw-type gasket preferably includes rotor-mounted helical fillets (22) formed in a section (21) that is retained in a seat (20) on the rotor. The section in embodiments is retained by inserting a ring-shaped key (23) into the section, thereby forcing the section into undercuts of the seat. The arrangement is particularly useful in wind machines, such as wind-turbines.Type: ApplicationFiled: September 21, 2006Publication date: October 9, 2008Applicant: HIGH TECHNOLOGY INVESTMENTS, B.V.Inventors: Otto Pabst, Michael Kleinlercher, Franco Gadrino
-
Patent number: 7427070Abstract: An annular unitizing element has a rotor engaging member, a stator engaging member, and a rear member. The radially outer surface of the unitizing element has two areas of differing diameter, one corresponding to the rotor engaging member and the other corresponding to the rear member. The stator engaging member extends radially inward from the radially inner side of the annular unitizing element. A sealing assembly for sealing a rotating shaft and a bearing housing has a rotor having an annular engagement flange extending in an axial direction comprising a groove on a radial side thereof, a stator having an annular engagement flange extending in an axial direction comprising a groove on a radial side thereof, and an annular unitizing element having a stator engaging member, a rotor engaging member, and a rear member.Type: GrantFiled: February 23, 2007Date of Patent: September 23, 2008Assignee: Garlock Sealing Technologies LLCInventors: Elizabeth Chitren, Christopher Tones
-
Patent number: 7422662Abstract: The invention relates to a sealing arrangement (7) against a moving fabric (4b) in a paper machine or the like. The sealing arrangement includes a stiff sealing element (9) placed on the fabric's (4b) side on the entire width in connection with a paper sheet (4a) supported by the fabric (4b). The sealing element has been arranged on a support so that the location of the sealing element with respect to the fabric (4b) can be adjusted nearer to or, correspondingly, further from the fabric. As a sealing element there is at least a single-chambered labyrinth sealing (19).Type: GrantFiled: November 19, 2003Date of Patent: September 9, 2008Assignee: Metso Paper, Inc.Inventors: Juha Leimu, Antti Komulainen, Kari Juppi, Matti Kurki, Martti Salminen, Reijo Jokinen
-
Patent number: 7419164Abstract: A shaft seal serves to reduce leakage between a rotating shaft and a static shell. The shaft seal includes a plurality of compliant plate members, each having a root and a tip. The compliant plate members are secured to the static shell at their root in facing relation. The tips of the compliant plate members define a sealing ring between the static shell and the rotating shaft. An axial flow resistance member is disposed within the compliant plate members and serves as a barrier to axial leakage flow between the compliant plate members.Type: GrantFiled: August 15, 2006Date of Patent: September 2, 2008Assignee: General Electric CompanyInventors: Shorya Awtar, Norman Arnold Turnquist
-
Publication number: 20080197575Abstract: A stationary labyrinth seal system includes a seal housing having an annular cavity, a plurality of damping devices, and a retaining ring. The damping devices are positioned within the annular cavity and are maintained within the annular cavity by the retaining ring.Type: ApplicationFiled: February 20, 2007Publication date: August 21, 2008Applicant: United Technologies CorporationInventors: Yehia M. El-Aini, William S. Mitchell, Lawrence P. Roberts, Stuart K. Montgomery, Gary A. Davis
-
Patent number: 7396017Abstract: A shaft seal assembly for maintaining a seal during shaft misalignment comprising a first sealing means adjacent said shaft with a defined clearance between said shaft and said sealing means, said shaft moveable axially in relation to said first sealing means; a second sealing means, said first sealing means partially encompassed within second sealing means and in cooperative communication with said second sealing means; a third sealing means, said second sealing means partially encompassed within third sealing means and in cooperative communication with said third sealing means, said third sealing means attached to said housing or vessel and allowing said first sealing means and second sealing means to cooperatively respond to said forces produced by angular misalignment of said shaft during rotation of said shaft while maintaining defined clearance between said shaft and said sealing means.Type: GrantFiled: April 17, 2006Date of Patent: July 8, 2008Assignee: Isotech of Illinois, Inc.Inventors: David C. Orlowski, Neil F. Hoelhe
-
Patent number: 7364165Abstract: A leaf seal as a shaft seal mechanism is made compact and enables reduction of manufacturing cost. Plural thin plates 29 lapped one on another in layers have their outer circumferential proximal ends fixed to each other by welding so that an annular thin plate assembly 29A having flexibility is formed. This thin plate assembly 29A is bent and assembled to form the leaf seal 25.Type: GrantFiled: May 20, 2004Date of Patent: April 29, 2008Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Takashi Nakano, Hirokazu Shirai, Toshio Asada, Shin Nishimoto, Tanehiro Shinohara, Hidekazu Uehara
-
Patent number: 7314218Abstract: An adaptor that can be used with rotary fluid equipment will protect mechanical seals and/or packing material adjacent a seal cavity (18) of the equipment. The adaptor includes an annular body (30) with a central bore (32) adapted to receive a shaft (12) of the equipment. When used with mechanical seals the adaptor is receivable in the cavity at the entrance thereto and it has a portion which surface which effects contact with a complementary surface of the seal. When used with packing the adaptor fits within the cavity and defines an outboard extension in which the packing can be received. The bore defines two portions, one of which is close to the shaft (52) and another portion (54) which flares outwardly from the one portion towards the outboard end of the adaptor. Each bore portion has a spiral groove (56, 58) therein, which groove serves to redirect contaminant material contained in fluids surrounding the shaft away from the seal cavity.Type: GrantFiled: November 30, 2006Date of Patent: January 1, 2008Assignee: Enviroseal Engineering Products, Ltd.Inventor: Paul Hughes
-
Publication number: 20070257444Abstract: According to one embodiment of the disclosure, an annular seal generally includes a hollow member having two ends and an inner surface. The hollow member has a number of depressions formed in and extending around its inner surface. Each of the depressions having a depth that is a function of its distance from one of the two ends.Type: ApplicationFiled: May 4, 2007Publication date: November 8, 2007Applicant: The Texas A&M University SystemInventor: Dara W. Childs
-
Publication number: 20070241513Abstract: A seal device, which accommodates axial displacement between a housing and shaft of an item of rotating equipment, includes a stator which locates into the housing of a piece of rotating equipment. A first rotor locates on the shaft of the rotating equipment and a second rotor is rotationally coupled to the first rotor and is permitted axially to float with respect to the first rotor. The device provides sealing integrity when the shaft is both idle and operational. The sealing device may be used, for instance, in a double ended centrifugal pump where shaft displacement occurs from thermal expansion.Type: ApplicationFiled: April 18, 2007Publication date: October 18, 2007Inventor: Alan James Roddis
-
Patent number: 7278449Abstract: The invention relates to a switch for branching off bulk material flows, the switch includes a rotary plug (1) which is arranged in a fixed housing having preferably three connection openings. In a first position the plug establishes a connection between a first pair of connection openings and, by rotation into a second position, establishes a connection between a second pair of connection openings, a gap being provided between the rotary plug (1) and the housing in such a way as to arrange the rotary plug (1) in the housing in a non-contact manner without any additional contact sealing elements. The plug (1) and/or said housing includes at least one labyrinth sealing arrangement (7).Type: GrantFiled: August 2, 2003Date of Patent: October 9, 2007Assignee: Zeppelin Silo- und Apparatetechnik GmbHInventors: Robert Mueller, Franz-Josef Vogelsang
-
Patent number: 7249769Abstract: A seal (40) provides sealing between two pressure zones (60, 62) and a rotating and non-rotating member (42, 52) by providing a first sealing member (46) between two seal lands (48, 50). A second seal (64) is mounted between the non-rotating member (52, 58) and one of the seal lands (50, 66) so as to control pressure around the seal lands (48, 50).Type: GrantFiled: June 27, 2005Date of Patent: July 31, 2007Assignee: Rolls-Royce plcInventor: John R Webster
-
Patent number: 7226053Abstract: A shaft seal mechanism (leaf seal) by which a desired seal performance can be stably obtained is provided. The shaft seal mechanism comprises a concave groove 71 formed larger than a minimum size of a plate width of thin plates 29 and a fitting piece 61 fitted in a gap between the concave groove 71 and a leaf seal 25. The leaf seal 25 comprises an annular thin plate assembly 29A constructed by the thin plates 29 and a plate spring 56 integrally formed therewith supporting the annular thin plate assembly 29A to be levitated coaxially with a rotating shaft 23. The thin plates 29 have their outer circumferential proximal end side made movable relative to the concave groove 71. A shaft seal mechanism assembling structure is also provided comprising a pressure receiving surface 61b and a lower pressure side plate 54 forming a predetermined gap size between the pressure receiving surface 61b and one side edges of the thin plates 29.Type: GrantFiled: May 19, 2004Date of Patent: June 5, 2007Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Takashi Nakano, Hirokazu Shirai, Toshio Asada, Shin Nishimoto, Tanehiro Shinohara, Hidekazu Uehara
-
Patent number: 7201377Abstract: An annular unitizing element comprising a rotor engaging member, a stator engaging member, and a rear member. The radially outer surface of the unitizing element comprises two areas of differing diameter, one corresponding to the rotor engaging member and the other corresponding to the rear member. The stator engaging member extends radially inward from the radially inner side of the annular unitizing element. A sealing assembly for sealing a rotating shaft and a bearing housing comprising a rotor comprising, an annular engagement flange extending in an axial direction comprising a groove on a radial side thereof, a stator comprising, an annular engagement flange extending in an axial direction comprising a groove on a radial side thereof, and an annular unitizing element comprising, a stator engaging member, a rotor engaging member, and a rear member.Type: GrantFiled: December 9, 2005Date of Patent: April 10, 2007Assignee: Garlock Sealing Technologies LLCInventors: Elizabeth Chitren, Christopher Tones
-
Patent number: 7186074Abstract: A drum-type rotor carries an annular row of moving blades having root portions held within a slot in the periphery of the rotor. A turbine casing surrounds the rotor and carries a static blade assembly with an annular row of static blades which, together with the annular row of moving blades, constitutes an impulse turbine stage. The static blade assembly has a radially inner static ring confronting a periphery of the rotor with a seal acting therebetween. The static blade assembly has an outer static ring which has a substantially greater thermal inertia and stiffness then the inner static ring and is capable of sufficient radial sliding relative to the casing so as to accommodate relative thermal expansion and contraction of the outer static ring and the turbine casing.Type: GrantFiled: May 13, 2004Date of Patent: March 6, 2007Assignee: Alstom Technology, Ltd.Inventors: David Paul Blatchford, Richard Martin Bridge, Philip David Hemsley, Alan Hesketh, Adrian Lord
-
Patent number: 7125018Abstract: A low-friction seal comprising a quasi dimensionally stable sealing ring (44) that is accommodated with radial and axial clearance in a groove (30; 76) of one of two surface, whereby said surfaces are sealed off from each other and can move in a relative position to each other, and the peripheral section of the sealing ring protruding from the groove (30? 76) is placed opposite the other surface that is to be sealed. Means are provided between the side wall (34; 80, 82) of the groove on the side of the pressure-chamber and the sealing ring (44) in order to prevent pressure from spreading to the bottom (37, 78) of the groove, whereby radial deformation of the sealing ring in the direction of the surface that is to be sealed is avoided.Type: GrantFiled: July 9, 2003Date of Patent: October 24, 2006Assignee: Herbert Hanchen GmbH & Co. KGInventors: Herbert Busse, Hans-Dieter Fabrowsky
-
Patent number: 7121551Abstract: An arrangement (120) of members for a throat bushing for rotary fluid equipment includes a first member (122) that is useful for seal cavities that contain conventional packing, and a second bushing member (132) that will be used in conjunction with the first bushing member if the seal cavity utilize a mechanical seal at the remote end of the cavity. Both bushing members (122, 132) are provided with spiral grooves (140) in a central bore thereof for the removal of contaminants from the seal cavity. The distal end face (124) of the first bushing member is contoured to receive a mating proximal end face (144) of the second bushing member or to also receive the abutting face of a packing ring or a lantern ring. The arrangement of the invention allows an operator to switch between the use of a mechanical seal or conventional packing without having to discard his primary seal cavity protector.Type: GrantFiled: June 26, 2002Date of Patent: October 17, 2006Assignee: Enviroseal Engineering Products, Ltd.Inventors: Aniko Dunford, legal representative, Paul Hughes, Joseph R. Dunford, deceased
-
Patent number: 7118046Abstract: In a sliding structure in which a shaft member is retained slidably in a guide hole, the lack of an oil film caused by the edge contact of the shaft member to which a pressing load in the axial direction is applied is prevented. With the fact being taken into account that end portions 25c1 and 25c2, which are always in slidable contact with a side surface 1232a of a guide hole 1232, of a side surface 25c of a shaft member 251 are the partial edge portion, a plurality of labyrinth grooves 2501 and 2502 are formed in the end portions 25c1 and 25c2, respectively, thereby it is possible for an oil film to cover the entire contact portion without increasing the groove width extremely. Because the groove width is not increased extremely, the length of the sliding portions can be ensured.Type: GrantFiled: January 20, 2004Date of Patent: October 10, 2006Assignee: Denso CorporationInventors: Tetsuya Yoshimura, Shuichi Matsumoto
-
Patent number: 7090178Abstract: A rotatable payload support turret for operation in a potentially hazardous environment includes a fixed element attached to a vehicle or fixed structure and a rotatable element, supported for rotation with respect to the fixed element. The turret includes a camera payload having a pointing direction configured to be upwardly pointing. An annular clearance gap formed between the fixed element and the rotatable element is sealed by a conventional gas tight magnetic fluid seal element. A wiper seal is also provided in the clearance gap between the location of the magnetic fluid and the external environment to prevent breakdown of the magnetic fluid by elements of the potentially hazardous environment. The clearance gap may also form a labyrinth seal having up to three legs that are oriented to oppose a gravitational force direction.Type: GrantFiled: August 10, 2004Date of Patent: August 15, 2006Assignee: Flir Systems Inc.Inventors: Michael R. Hughes, Thomas M. Sommer, Ronald J. Rosi
-
Patent number: 7086648Abstract: The invention relates to a sealing device having an acoustic resonator. The acoustic resonator is adapted to create acoustic waveforms to generate a sealing pressure barrier blocking fluid flow from a high pressure area to a lower pressure area. The sealing device permits noncontacting sealing operation. The sealing device may include a resonant-macrosonic-synthesis (RMS) resonator.Type: GrantFiled: August 22, 2003Date of Patent: August 8, 2006Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventor: Bruce M. Steinetz
-
Patent number: 7048253Abstract: A fuel injector for fuel-injection systems of internal combustion engines has a nozzle body and a magnetic coil positioned in a magnetic cup, the magnetic coil being penetrated by the nozzle body; and a plastic coating which at least partially surrounds the nozzle body. The nozzle body and the magnetic cup are sealed from an environment of the fuel injector by a thread-type labyrinth seal.Type: GrantFiled: May 7, 2002Date of Patent: May 23, 2006Assignee: Robert Bosch GmbHInventor: Hubert Stier
-
Patent number: 7044471Abstract: A cartridge seal is co-axially secured within the circular aperture of a back plate bolted to a pump housing. Annular recesses are provided around inner and outer sides of the back plate, surrounding the circular aperture. The cartridge-type seal includes a stationary gland assembly and a rotatable shaft collar assembly. The inner side of the gland assembly includes a taper bore surrounding the pump drive shaft, and a circumferential lip. The lip nests within the inner annular recess of the back plate. The outer side of the gland assembly includes a circumferential groove. The collar assembly is locked to the drive shaft by means of setscrews. A snap-ring within the circumferential groove of the gland assembly is located within the outer side recess of the back plate. The snap-ring precludes axial movement of the gland assembly, while allowing quick removal and replacement of the cartridge seal.Type: GrantFiled: December 17, 2003Date of Patent: May 16, 2006Inventors: Robert L. Elliott, Bryan D. Hampton
-
Patent number: 7004475Abstract: A method and apparatus for reducing steam swirl in a steam turbine. A plurality of seal segments (14) are circumferentially juxtaposed to form a seal ring (12) encircling the turbine shaft (10), each seal segment (14) supporting a plurality of circumferentially disposed annular seal fins (20) to limit axial steam flow along the shaft (10). A plurality of flow dams (40) are disposed within grooves (42) defined in the plurality of seal fins (20) and seal segments (14) for limiting circumferential steam flow and thereby reducing rotor instability.Type: GrantFiled: September 26, 2003Date of Patent: February 28, 2006Assignee: Siemens Westinghouse Power CorporationInventors: Matthew J. McHale, Lewis Gray
-
Patent number: 6976679Abstract: An inter-fluid brush seal assembly and associated method are provided. The seal assembly defines a gas passage for supplying gas to interfaces with a rotatable member. At least one of the interfaces is defined by a brush seal, and the flow of the gas through the interfaces can prevent the flow of fluid through the assembly, thereby sealing the assembly and preventing the fluid from passing therethrough. The gas and the fluid can be drained from the assembly through one or more drains.Type: GrantFiled: November 7, 2003Date of Patent: December 20, 2005Assignee: The Boeing CompanyInventors: James D. Goss, Jozsef L. Moharos, Dean J. Nunez
-
Patent number: 6969242Abstract: To counter downstream oil infiltration through a shaft seal, a small portion of the compressed fluid is diverted from downstream to upstream through a passageway in a rotor. The diverted fluid is introduced to a space at a downstream side of the seal. An exemplary implementation is in a compressor having a central male rotor intermeshed with a pair of female rotors. The seal is located at an upstream (inlet) end of the lobed working portion of the male rotor.Type: GrantFiled: February 28, 2003Date of Patent: November 29, 2005Assignee: Carrier CorpoationInventors: Donald Yannascoli, Stephen L. Shoulders
-
Patent number: 6932349Abstract: A system (10) for sealing and pressurization for the support cushion (24) of a gas turbine (20), wherein the gas turbine (20) is provided with a compressor (21), with which there is associated an inner barrel (23), and the support cushion (24) is in turn provided with seals (38, 39) relative to the axis of the compressor (21), and has at least one pipe (33) for the venting discharge. The air is fed into the inner barrel (23), using the venting piping (33) of the support cushion (24), such as to create a flow of air, which starts from an intermediate stage of the compressor (21), and goes towards the inner barrel (23).Type: GrantFiled: June 20, 2001Date of Patent: August 23, 2005Assignee: Nuovo Pignone Holding S.p.A.Inventor: Alessandro Coppola
-
Patent number: 6923449Abstract: A baffle seal at the opening (31) for the load-transmitting member (20) in a balance housing (30) has at least one sleeve-shaped ring element (11, 110), fastener means (23) attached to the housing (30) and serving to hold the sleeve-shaped ring element in a stationary working position surrounding the opening, and a cover cap (1) with at least one sleeve-shaped ring (10, 10?, 12) that is axially movable relative to the sleeve-shaped ring element. The ring element is releasable so that it can be separated from the balance without dismantling other parts.Type: GrantFiled: October 9, 2002Date of Patent: August 2, 2005Assignee: Mettler-Toledo GmbHInventors: Hans-Rudolf Burkhard, Luzi Hess, Willi Graf
-
Patent number: 6896482Abstract: A turbine includes, in an exemplary embodiment, an outer housing, a turbine shaft rotatably supported in the outer housing, and a plurality of turbine stages located along the turbine shaft. Each turbine stage includes a diaphragm attached to the casing, a rotor having a plurality of buckets and a bucket cover fixedly attached to the turbine shaft, and a packing ring mounted in a first circumferentially extending groove in said diaphragm. The packing ring includes a seal shroud and a sealing means and is positioned adjacent the turbine shaft. The seal shroud is fabricated from a first material having a first coefficient of expansion, and the is diaphragm fabricated from a second material having a second coefficient of expansion. The first and second materials are selected so that at a first temperature a gap between the turbine shaft and the diaphragm is larger than at a second higher temperature.Type: GrantFiled: September 3, 2003Date of Patent: May 24, 2005Assignee: General Electric CompanyInventor: William Thomas Parry
-
Patent number: 6893022Abstract: An arrangement for sealing an opening of a rotor housing in which a vacuum prevails, through which opening a shaft of a spinning rotor, supported outside of the rotor housing, projects. The arrangement has free floating sealing element arranged towards the opening and forming at least two sealing gaps with the spinning rotor. A first sealing gap is located between the sealing element and the shaft, a second sealing gap is located between the sealing element and a collar of the spinning rotor which borders the shaft. The sealing element can form an additional third sealing element with the back wall of the spinning rotor.Type: GrantFiled: July 24, 2003Date of Patent: May 17, 2005Assignee: Maschinenfabrik RieterInventor: Gerd Stahlecker
-
Patent number: 6880223Abstract: A grease slinger, power tool and method of assembling a power tool. The power tool includes a housing, a motor supported in the housing and including a rotatable shaft extending along an axis, a gear case connected to the housing, a flange between the housing and the gear case having a first side and a second side and defining an opening extending between the first side and the second side, a drive mechanism supported by the gear case and drivingly engaging the motor shaft, and a grease slinger. The grease slinger includes a body supportable on the shaft for rotation with the shaft relative to the flange. The body has a first face providing a grease-slinging surface and a second face facing the first side of the flange. The second face includes an annular side wall defining an annular channel. The side wall and the channel cooperate with the flange to provide a labyrinth seal and to prevent grease from flowing from the gear case into the housing.Type: GrantFiled: April 25, 2002Date of Patent: April 19, 2005Assignee: Milwaukee Electric Tool CorporationInventor: Thomas R. Bednar
-
Patent number: 6874788Abstract: A strip brush seal device for improving a seal capability of a seal portion, promoting an elastic deformation of the seal portion, and preventing wear of the seal portion. Also for providing a secure joint to a mounting portion of the strip seal brush. The strip brush seal comprises a mounting portion which is located toward the side of protrusions of individual seal strips in which the protrusions of the seal strips are integrally joined along a direction of width of the strip, a strip brush seal which retains a seal portion to the radially inward direction relative to the mounting portion, a back plate which is disposed in the opposite side of the action of a process fluid, and a joint portion which is formed by welding the individual protrusions of the seal strips.Type: GrantFiled: May 19, 2004Date of Patent: April 5, 2005Assignees: Eagle Engineering Aerospace Co., Ltd., Mitsubishi Heavy Industries, Ltd.Inventor: Toru Kono
-
Patent number: 6866270Abstract: A C-section ring fixed on a steel-mill roll and coaxially surrounding its stub has inner and outer axially extending legs defining an axially open cavity. The inner leg is tapered away from the roll and is formed adjacent the free end with a radially outwardly open annular groove. An annular cover part fixed on a stationary support, engaged in the cavity, forming a drain compartment open axially away from the roll, and formed with a radially outwardly open catchment groove radially aligned with a free end of the inner leg is also formed with a passage extending from the catchment groove to the drain compartment. An annular extension on the cover part has an inner surface carrying a seal ring that bears radially inward on the stub. An add-on part on the extension forms with the extension, with the cover part, and with the C-section ring a labyrinth.Type: GrantFiled: January 30, 2002Date of Patent: March 15, 2005Assignee: SMS Demag AktiengesellschaftInventors: Karl Keller, Konrad Roeingh
-
Patent number: 6863258Abstract: A motorized damper door assembly for use in freezing temperature applications includes a damper frame, a damper door having, a mounting portion rotatably mounted to the frame, and a seal member having a vertically extending moisture barrier adjacent the mounting portion. The door mounting portion and the moisture barrier together form a reservoir inside the door mounting portion to prevent moisture from seeping directly into the motor housing below the door mounting portion. Consequently, as moisture accumulation in the motor housing is avoided, associated damper jamming and impaired performance issues are also avoided.Type: GrantFiled: January 5, 2001Date of Patent: March 8, 2005Assignee: General Electric CompanyInventor: Jeffery Allen Tupis
-
Patent number: 6860484Abstract: A rotor seal, especially for turbo engines, is described. The sealing elements are folded from a pleated band and are connected to each other even when the rotor seal is in the assembled state. The barrier effect of the inventive rotor seal is thus increased in relation to lamella seals that always require a gap between the individual lamella.Type: GrantFiled: August 12, 2002Date of Patent: March 1, 2005Assignee: Alstom (Switzerland) Ltd.Inventor: Karl Urlichs
-
Patent number: 6845986Abstract: A unitized seal assembly for use with roller or ball bearing assemblies is disclosed. The unitized seal assembly includes, among other things, a radially outer ring and a radially inner deflector ring. The outer ring includes a first shield element which defines a first sealing face. The radially inner deflector ring includes a second shield element which defines a second sealing face. The second sealing face is dimensioned and configured so as to correspond to the first sealing face such that when the first shield element is positioned in non-contacting proximity to the second shield element, a circuitous sealing labyrinth is formed between the first sealing face and the second sealing face.Type: GrantFiled: April 26, 2002Date of Patent: January 25, 2005Assignee: Stemco LLCInventors: Charles Robin Hood, Donald G. Wells, Mark N. Gold