Fluid Biased, Movable Or Resilient Portion Patents (Class 415/113)
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Patent number: 5411366Abstract: A motor driven environmentally safe pump includes a sealed motor housing (22) sealingly affixed to a sealed pump housing. The pump housing defines a fluid pumping chamber (43) in which is a fluid pumping impeller (46). A triplex rotating seal (31) is disposed rearward of impeller (46) within an annular fluid chamber (87) so as to prevent the fluid being pumped via the impeller (46) from leaking along the shaft (23) toward the motor (21). A piston seal (32) is provided adjacent a second fluid chamber (204), the piston seal also for preventing fluid from leaking into the motor housing and damaging the motor.Type: GrantFiled: June 3, 1994Date of Patent: May 2, 1995Assignee: Environamics CorporationInventor: Robert E. Rockwood
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Patent number: 5409350Abstract: A water pump for use mounted on an internal combustion engine includes a pump housing, a shaft rotatably disposed in the pump housing, a pumping element attached to the shaft, and a removable bearing and seal cartridge disposed in the pump housing. The removable bearing and seal cartridge includes a cartridge housing adapted for receipt mounted in the pump housing, bearing means for axially and radially locating the shaft relative to the pump housing, and sealing means for sealing working fluid from the bearing means.Type: GrantFiled: October 29, 1993Date of Patent: April 25, 1995Assignee: Caterpillar Inc.Inventor: Harold J. Mitchell
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Patent number: 5377216Abstract: A turbine-type compressor useful in a gas laser apparatus for flowing gas along a flow path of the laser includes a sealing arrangement about a drive shaft of the compressor for preventing undesirable substances from moving to the compressor impeller along the drive shaft of the compressor and contaminating the laser gas compressed thereby. The sealing arrangement includes a first seal, preferably a vacuum pressure seal, for sealing about the shaft at least during rotation of the shaft, and a second seal comprising a resilient bladder which is selectively expanded and contracted to move into and out of sealing contact with the drive shaft, respectively, for, on one hand, sealing against the shaft when the drive shaft is stationary during pumping down of the laser and, on the other hand, withdrawing the bladder from the shaft when the shaft is rotating. The sealing arrangement is reliable and relatively low cost and uses less gas than a prior art sealing arrangement.Type: GrantFiled: June 4, 1993Date of Patent: December 27, 1994Assignee: PRC CorporationInventors: Carl J. Nilsen, Walter Q. Wilson, Kenneth M. Tullio
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Patent number: 5340273Abstract: An environmentally leak-proof pump is provided including: an environmentally leak-proof motor housing having located therein a motor for rotatably driving a rotating shaft; a piston seal axially forward of the motor; and an oil misting chamber disposed between the motor and the piston seal, the misting chamber for simultaneously providing lubrication to two coaxially disposed spaced apart bearings. The oil mister (34) includes a dispenser (260) fixed to a rotating shaft (23), the dispenser having a plurality of nozzles formed by bores (262 and 263) on opposing sides of the dispenser body. Each bore communicates with a passageway (264) thus allowing each nozzle to continuously direct a flow of lubricating liquid or mist toward adjacent bearings (35 and 36).Type: GrantFiled: August 4, 1993Date of Patent: August 23, 1994Assignee: Environamics CorporationInventor: Robert E. Rockwood
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Patent number: 5334004Abstract: A compressor or turbine type rotary machine for compressing or expanding a dangerous gas, e.g. a gas that is toxic or explosive, comprises a closed enclosure formed outside the stator around a shaft passage receiving the shaft of the rotor, the enclosure being delimited by a bell and being filled with a liquid under pressure, a wet type mechanical seal being disposed between the rotor shaft and the stator, inside the stator. The liquid contained in the enclosure is put under pressure, and a magnetic coupling is provided to link the rotor shaft to an outside shaft. The invention makes it possible to prevent any leakage of dangerous gas from the inside to the outside of the rotary machine.Type: GrantFiled: February 11, 1992Date of Patent: August 2, 1994Assignee: Bertin & CieInventors: Paul Lefevre, Alain Verneau
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Patent number: 5312225Abstract: In a turbo machine with magnetic bearings on both sides and dry gas seals for the rotor, the axial thrust acting upon the rotor and generated by the pressure difference between the pressure side and the suction side is compensated for in that a dry gas seal provided on the suction side and the end of the shaft are acted upon by a certain pressure, which generates a compensating axial thrust, so that the resultant axial thrust becomes as slight as possible. Advantageously, this pressure is regulated via the bearing gap of an axial magnetic bearing of the rotor such that the bearing gas assumes a predetermined value.Type: GrantFiled: September 1, 1992Date of Patent: May 17, 1994Assignee: Sulzer Escher Wyss AGInventor: Heinrich Lorenzen
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Patent number: 5238253Abstract: A regenerative turbine flow inducer for moving lubricating fluid through a seal chamber of a bearing assembly for lubricating sealing surfaces includes a turbine impeller rotated by the shaft and a pair of liners which enclose the impeller, the liners defining fluid inlets on both sides of the impeller, which are communicated with a source of lubricating fluid, and a fluid discharge outlet, the liners containing lubrication fluid supplied thereto and directing the fluid to the impeller as the impeller is rotated, drawing lubrication fluid through the liners. The regenerative turbine flow inducer may be used with double or tandem mechanical seals.Type: GrantFiled: April 22, 1991Date of Patent: August 24, 1993Assignee: Roy E. Roth CompanyInventor: Leonard J. Sieghartner
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Patent number: 5232334Abstract: The rotary machine includes an automatically-retracting axial abutment system mounted between the rotary shaft of the machine and its case, the abutment system having a displaceable abutment portion that is prevented from rotating, a rotary abutment portion mounted on the displaceable abutment portion by means of a bearing suitable for transmitting axial forces to the displaceable abutment portion, a very stiff flexible device connecting the displaceable abutment portion to the case in such a manner as to enable the displaceable abutment portion to move through a small amplitude in translation along the axis of the rotary shaft, and an axial thrust transmission member for transmitting thrust from the rotary shaft to the rotary abutment portion, the thrust transmission member being shaped to be in contact between the rotary shaft and the displaceable abutment portion when the machine is at rest, and to drive the rotary abutment portion via purely static friction when the machine is rotating and is exerting axiType: GrantFiled: October 29, 1991Date of Patent: August 3, 1993Assignee: Societe Europeenne de PropulsionInventors: Claude Mechin, Luc Chatenet
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Patent number: 5228827Abstract: Device for the removal of liquid components issuing from a shaft seal into a cavity (3) enveloping a rotating shaft (1). A frictional heat source for the evaporation of the liquid components is associated with the cavity (3) and/or parts of the engine adjoining it.Type: GrantFiled: January 6, 1992Date of Patent: July 20, 1993Assignee: Firma Carl FreudenbergInventors: Detlef Cordts, Frank Wagner
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Patent number: 5211532Abstract: An arrangement for applying a back pressure to a shaft seal of a mechanism such as a pump comprises a piston slidable in a cylinder one end of which communicates with the fluid being pumped and the other end of which contains oil communicating with a sealed chamber on that side of the seal remote from the fluid. Hitherto, the piston has created a preponderance of the back pressure over the pressure of the fluid by virtue of its weight. This preponderance has been very small, and the rolling diaphragm seal needed on the piston has been easily ruptured if the oil has been lost, thereby allowing possibly hazardous fluids to escape. A greater preponderance of the back pressure, allowing the use of a stronger type of piston seal, is provided by urging the piston towards the other end of the cylinder by a spring as well as by the pressure of the fluid.Type: GrantFiled: May 29, 1992Date of Patent: May 18, 1993Assignee: David Brown Engineering LimitedInventor: Peter Thompson
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Patent number: 5076591Abstract: A combination air seal for opposed flanges of a casing structure containing air at elevated pressure includes rectangular cross-section groove in one face of one of the opposed flanges and a narrow compressible gasket or seal strip in the groove at one side thereof to define an open transverse channel in the groove oriented transversely to the direction of air leakage through the flanges from the elevated pressure conditions in the structure. Air under elevated pressure leaks across the interface of the flanges to be taken up by the open transverse channel and conducted to a lower pressure region of the structure for further utilization. The gasket is adapted to be adequately but not excessively compressed when metal to metal engagement of the flanges is achieved. The compressed gasket prevents excess air in the channel from escaping from the channel to pass across the flange interface and escape from the casing structure.Type: GrantFiled: June 11, 1990Date of Patent: December 31, 1991Assignee: General Electric CompanyInventor: Richard W. Gentile
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Patent number: 5006043Abstract: An aircraft fuel pump (1) is provided with a centrifugal impeller (2) and a stationary housing (3). A floating annular seal (4) mates with both the stationary housing and the rotating impeller thus providing sealing on two surfaces. The annular seal (4) comprises, in combination, a sealing material (5) positioned radially opposite the surface (6) of the impeller to be sealed, a backing ring (7) radially spaced from the sealing material for axially sealing against a surface (13) on a mating ring (15) of the stationary housing (3), and an elastomer (8) which is bonded to both the sealing material and the backing ring. The sealing material (5) is in the form of sealing material segments (9, 10, 11) which are arranged end to end with expansison grooves (12) remaining between the opposed ends for accommodating differences in thermal expansion between the impeller and the sealing material.Type: GrantFiled: November 20, 1989Date of Patent: April 9, 1991Assignee: Sundstrand CorporationInventors: Shin Katsumata, Mark W. Corcoran
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Patent number: 4969797Abstract: A rotor shaft provided with a fan is rotatably supported by pneumatic bearings for the purpose of high speed rotation with low noise. The rotor shaft provided with the fan can also be supported at one end by a resilient bearing so as to provide high speed rotation even if the concentricity of the bearings is low.Type: GrantFiled: March 22, 1989Date of Patent: November 13, 1990Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Akira Takara, Teruo Maruyama
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Patent number: 4916892Abstract: In a gas turbine engine including first and second differentially rotating members coaxial with each other, a low pressure region disposed about the first and second differentially rotating members, and an annular gas flowpath disposed within the first and second differentially rotating members defining a high pressure region, a method and apparatus for preventing fluid leakage between the first and second rotating members. An annular carrier is coupled to the first rotating members such that the annular carrier is coaxial with the first rotating member. The annular carrier is sandwiched between a first race and a second race with the first and second races coupled to the second rotating member. The second race is urged toward the first race such that leakage of a fluid from the high pressure region to the low pressure region is not substantially increased by frictional wear of any of the annular carrier, first race and second race.Type: GrantFiled: May 6, 1988Date of Patent: April 17, 1990Assignee: General Electric CompanyInventor: Adam N. Pope
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Patent number: 4867633Abstract: A centrifugal pump with hydraulic thrust balance and tandem axial seals. The centrifugal pump has an impeller with front and rear axial seals operating in unison to either reduce or increase the size of gaps therebetween. The gaps are of a minimal dimension to minimize leakage. The rear axial seal is located at the tip of the impeller with the front axial seat located either at the impeller eye or radially outwardly thereof. Hydraulic thrust balance is achieved and continuously maintained by axial movement of the impeller shaft and impeller to modulate the gap at the rear axial seal and, thus, control the value of an effective pressure acting on the back side of the impeller whereby an outward thrust force resulting therefrom counterbalances an inward thrust force resulting from pressure acting on the front shroud of the impeller. A clearance at the rear of the impeller communicates with suction pressure through a restricted passage.Type: GrantFiled: February 18, 1988Date of Patent: September 19, 1989Assignee: Sundstrand CorporationInventor: Homer E. Gravelle
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Patent number: 4848774Abstract: A pump having a shaft and housing containing pressurized system fluid variable between low pressure at pump startup and high pressure at pump operation, employs a hydrostatic sealing assembly for sealably and rotatably mounting the shaft within the housing. In the assembly, both a runner mounted around the shaft for rotation therewith and a seal ring mounted to the housing have facing surfaces between which pressurized system fluid creates a flowing low pressure fluid film which prevents contact between the facing surfaces so long as a predetermined minimum leakrate is maintained therebetween. First and third seal ring surfaces face in opposite directions with the second surface facing in the same direction as faced by the seal ring facing surface. First and second chambers are defined contiguous to the first and second surfaces with the first chamber in communication with pressurized system fluid and isolated from the second chamber and with the latter isolated from the runner and seal ring facing surfaces.Type: GrantFiled: August 31, 1987Date of Patent: July 18, 1989Assignee: Westinghouse Electric Corp.Inventors: Charles P. Nyilas, Richard F. Guardiani
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Patent number: 4844688Abstract: The high pressure turbine of a gas turbine engine is provided with an annular array of aerofoil rotor blades which are surrounded by a shroud. The shroud is mounted on a tubular diaphragm which is deflected by pressure modulation to vary the effective diameter of said shroud means. An L-shaped cross-section flange provided on the turbine casing cooperates with a plurality of L-shaped cross-section hooks on the diaphragm to limit radially inward movement of the shroud and thereby prevent contact between the aerofoil blade tips and the shroud means.Type: GrantFiled: August 21, 1987Date of Patent: July 4, 1989Assignee: Rolls-Royce plcInventors: Richard S. Clough, Peter F. Neal
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Patent number: 4744721Abstract: A turbopump sealing device is mounted in a case concentric with the rotary shaft between the turbine and the pump, the case defining a cavity for pressurizing gas, defined on the turbine side by a bearing ring which is integral therewith, in contact with a first floating ring secured against rotation and, on the pump side, by an applied shell one face of which is in contact with a second floating ring secured against rotation, itself bearing on a friction ring integral with the shaft, such rings being mounted on a socket concentric with the shaft, the shell being further connected to the cavity by a bellows.Type: GrantFiled: October 28, 1986Date of Patent: May 17, 1988Assignee: EG & G SealolInventor: Michel Villeneuve
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Patent number: 4734266Abstract: A pump seal oil system for a reactor pump wherein seal oil is provided at a pre-determined rate of flow without changing the rate of flow in response to pressure differences between the seal oil in the pump and the reactor pressure. Seal oil is provided at a first rate when the reactor pump is in operation and at a second higher rate when the reactor pump is not in operation.Type: GrantFiled: December 20, 1985Date of Patent: March 29, 1988Assignee: Lummus Crest, Inc.Inventors: Roger P. Van Driesen, Bhaven Chakravarti
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Patent number: 4729724Abstract: An apparatus for propelling a continuous gas mixture stream of an inert carrier gas and an aggressive doping gas, includes an electric motor having a motor housing filled with pure carrier gas and a shaft with a shaft extension, a radial blower having an impeller mounted directly on the shaft extension and a blower housing filled with the gas mixture and coupled to the motor housing, a gas ring of pure carrier gas being continuously fed and maintained in a ring space for sealing the blower housing against the motor housing in an operating state, and a hollow sealing ring being inflated with compressed gas for sealing the blower housing from the motor housing when the blower is stopped.Type: GrantFiled: September 29, 1986Date of Patent: March 8, 1988Assignee: Kraftwerk Union AktiengesellschaftInventors: Hans-Heinrich Henning, Hartmut Lelickens, Herbert Schramm
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Patent number: 4688989Abstract: A gas rotary machine of a type which is driven by a driving system with two parallel axes wherein a pinion shaft supporting a pinion is made as a flexible shaft and damper bearings including ball/roller bearings are employed to support the flexible shaft so that the whole machine is kept compact and the power required therefor is reduced.Type: GrantFiled: September 5, 1984Date of Patent: August 25, 1987Assignee: Ebara CorporationInventors: Hideki Kondo, Noburu Shimizu, Yoichi Kanemitsu
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Patent number: 4687346Abstract: A bearing support in which a rotating shaft (2) is disposed within a fixed support structure (14) and includes a bearing assembly (4) centered within the fixed support structure (14) by a plurality of resilient centering rods (20). A seal carrier (28) is urged against a rotating sealing surface (26) by a spring (32) and is radially positioned by a plurality of guide pins (34) secured to the fixed support structure (14). The guide pins (34) are disposed circumferentially intermediate the centering rods (20) to achieve a low profile configuration.Type: GrantFiled: September 2, 1986Date of Patent: August 18, 1987Assignee: United Technologies CorporationInventor: Gabriel L. Suciu
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Patent number: 4684318Abstract: A centrifugal pump having a shaft supported by a hydrostatic bearing to which energizing fluid is supplied by the pump itself. Upon failure of the energizing fluid supply, an auxiliary source supplies the energizing fluid. A one way valve operates in response to fluid pressure to permit the energizing fluid, either from the pump or the auxiliary supply.Type: GrantFiled: November 25, 1985Date of Patent: August 4, 1987Assignee: Borg-Warner CorporationInventor: Johannes A. Mulders
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Patent number: 4673332Abstract: A seal continuously maintains a condition of fluid sealing between a housing and a shaft rotatably mounted in the housing, independently of the speed of rotation of the shaft. The seal includes a higher speed seal and a lower speed seal each disposed between the housing and the shaft. One of the seals is positioned axially stationary with respect to the shaft. The other of the seals is mobile (either axially or radially) with respect to the shaft, between a first position in sealing contact with the housing and shaft, and a second position out of sealing contact with the housing and shaft. Preferably, the lower speed seal is mobile, so as to be moved out of contact with the shaft when the higher speed seal operates effectively, so as to minimize wear on the seal.Type: GrantFiled: July 25, 1984Date of Patent: June 16, 1987Assignee: Teledyne Industries, Inc.Inventor: Raymond Smith
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Patent number: 4576548Abstract: An arrangement is provided for statically sealing between the inner shroud 12 of individual stator vanes of a gas turbine, and a seal housing 14 provided with a radially outwardly open channel 22 into which is received a plurality of outer seal segments 24, and which includes a radially outwardly open channel 33 throughout the length of each outer seal segment and with a plurality of inner seal segments received in the channel, with the outer seal segments being biased outwardly by the springs 36, and the inner seal segments 34 being biased outwardly into sealing contact with individual inner shrouds by the concentric inner compression springs 38 carried by the outer seal segments 24.Type: GrantFiled: January 17, 1984Date of Patent: March 18, 1986Assignee: Westinghouse Electric Corp.Inventors: Jan P. Smed, Kenneth E. Seitzer, Kent G. Hultgren
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Patent number: 4557664Abstract: An overhung steam turbine is described which features a seal assembly and a bearing assembly to minimize axial shaft movement. The seal assembly forms a pressure barrier between a relatively low vacuum exhaust region and an exhaust cavity disposed at one end of the rotor shaft to minimize the pressure differential across the ends of the shaft and the resultant thrust force of the rotor shaft against the turbine casing. A bearing assembly is provided which includes a pair of journal bearings and a pair of oppositely disposed thrust bearings. In one embodiment one thrust bearing is connected by an adapter ring which is mounted to a horizontally split bearing casing. In another embodiment, the thrust bearing is carried by one of the journal bearings. The journal bearings are preferrably connected by horizontally split ring bearings to facilitate insertion and removal of the bearings without removing the overhung shaft.Type: GrantFiled: April 13, 1983Date of Patent: December 10, 1985Assignee: Dresser Industries, Inc.Inventors: Alan H. Tuttle, James K. Leonard, Shireesh A. Agharkar, John Waggott
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Patent number: 4543038Abstract: A shaft sealing apparatus utilizing a flow of sealing fluid to block leakage of a second fluid; and including a valve element controlling the flow of sealing fluid as a function of shaft rotational speed.Type: GrantFiled: September 4, 1984Date of Patent: September 24, 1985Assignee: The Garrett CorporationInventor: Sam S. Kitaguchi
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Patent number: 4509897Abstract: A pump assembly wherein fluid under pressure in a pump housing is prevented from escaping around the drive shaft of the pump by a seal which is held in place by the combination of a spring and fluid pressure applied through a diaphragm or piston from the interior of the pump housing.Type: GrantFiled: May 23, 1983Date of Patent: April 9, 1985Inventor: James O. Sims
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Patent number: 4505638Abstract: A turbine-type underwater hydraulic motor includes a hermetically sealed chamber filled with oil, and bearings of rotating parts and a reduction gear unit are sealed in said sealed chamber. A part of the partitions isolating the sealed chamber from the exterior is comprised of a resilient member and thus the water pressure outside the motor and the oil pressures within the sealed chamber are balanced, thereby preventing the leakage of the oil and the entry of the water.Type: GrantFiled: January 8, 1982Date of Patent: March 19, 1985Assignee: Sugino Machine LimitedInventors: Kenji Sugino, Yukiaki Nagata
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Patent number: 4502835Abstract: A multistage hydraulic machine which includes a housing, a main shaft mounted in the housing, a high-pressure stage and low-pressure stage runner firmly secured to the main shaft wherein the housing has formed therein a plurality of runner chambers enclosing each of the runners, respectively, of the high-pressure and the low-pressure stage, a return passage communicating with the runner chambers of the high-pressure and low-pressure stages, a high-pressure stage, outer back chamber, a high-pressure stage, inner back chamber and a high-pressure stage, side chamber all of which are located within the runner chamber enclosing the high-pressure stage runner, a low-pressure stage, side pressure chamber located within the runner chamber enclosing the low-pressure stage runner, a mechanism for communicating the high-pressure stage, inner back chamber with the return passage, and a mechanism for respectively communicating the low-pressure stage, side pressure chamber with the return passage.Type: GrantFiled: September 10, 1982Date of Patent: March 5, 1985Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventor: Ichiro Yamagata
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Patent number: 4482293Abstract: A casing support structure for a gas turbine engine is provided with means for reducing the effect of distortions such as are produced by differential heating of the structure on shut-down. To this end the casing is mounted from supporting structure by links which are arranged to be individually heated by associated heaters. The degree of heating of the links is arranged to provide differential expansion which moves the casing so as to reduce the effect of eccentricities on the clearance between the casing and its associated rotor structure.Type: GrantFiled: February 2, 1982Date of Patent: November 13, 1984Assignee: Rolls-Royce LimitedInventor: Derick A. Perry
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Patent number: 4477086Abstract: A free standing, continuous seal ring 54. The seal ring is effectively circumferentially continuous. The seal ring is adapted to extend between two circumferentially extending structures 38, 42. The structures 38, 42 separate a region 46 having a first pressure from a region 44 having a lower pressure. The seal ring is formed of two elements: a first element 78 having a circumferential gap G; and, a second element 80 extending across the gap G. Various construction details which enhance the efficiency of the seal ring are disclosed. In one particular embodiment, the second element is nested within the first element.Type: GrantFiled: November 1, 1982Date of Patent: October 16, 1984Assignee: United Technologies CorporationInventors: Ernest Feder, Claude E. Thibeault
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Patent number: 4473144Abstract: A clutch hub for a motor vehicle transmission is used for transferring torque to a driven shaft rigidly and detachably connected thereto. The hub body comprises inclined tunnels with slanted corridors providing additional rotational effect and more even fluid distribution through intake ports. The hub also comprises a frusto-conical protuberance base blocking the fluid flow from a fluid intake chamber into a clutch hub chamber.Type: GrantFiled: May 18, 1982Date of Patent: September 25, 1984Assignee: International Harvester Co.Inventor: Aldo Allori
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Patent number: 4472108Abstract: A shroud assembly is pneumatically operated to adjust the clearance between the shroud segments and the tips of the rotor blades of an associated rotor. The assembly comprises a casing to which is secured a wall member which defines a chamber whose pressure may be varied by a valve. The wall member carries shroud segments some of which define the static wall with which the rotor blades co-operate. In order to allow proper movement of the shroud segments the support means which carry the segments from the wall are arranged to be small in axial extent compared with that of the wall.Type: GrantFiled: July 7, 1982Date of Patent: September 18, 1984Assignee: Rolls-Royce LimitedInventor: George Pask
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Patent number: 4427337Abstract: A liquid metal pump bearing support comprises a series of tangentially oriented spokes that connect the bearing cylinder to the pump internals structure. The spokes may be arranged in a plurality of planes extending from the bearing cylinder to the pump internals with the spokes in one plane being arranged alternately with those in the next plane. The bearing support structure provides the pump with sufficient lateral support for the bearing structure together with the capability of accommodating differential thermal expansion without adversely affecting pump performance.Type: GrantFiled: February 17, 1981Date of Patent: January 24, 1984Assignee: The United States of America as represented by the United States Department of EnergyInventors: Robert J. Dickinson, John Wasko, William E. Pennell
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Patent number: 4395048Abstract: The safety device insures the longitudinal tightness of a pump shaft in the case where the pump dynamic gasket separating the high pressure chamber from the low pressure chamber of the pump brakes. According to the invention, the device comprises a cylindrical hollow piston coaxially surrounding the pump shaft and the structure allowing the axial displacement of the piston in order to compress a toroidal safety gasket between the shaft and the piston in the event of a failure of the dynamic gasket.Type: GrantFiled: September 24, 1981Date of Patent: July 26, 1983Assignee: Jeumont-SchneiderInventors: Francis Timmermans, Jean Vandervorst
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Patent number: 4385864Abstract: A sealing device including a sealing ring extending around the periphery of a gas turbine stator section and located between the stator section and the free ends of the stator vanes. The sealing ring is formed of individual segments movable radially relative to each other. Each two adjacent sealing ring segments have opposed faces, one face presenting projections and the other having correspondingly shaped recesses for accommodating the projections with clearance. Each opposed face has a groove at least as deep as the projection or recess in that face, and a flat plate is located in the opposed grooves. Springs or gas pressure press the sealing ring segments radially outwardly against the free ends of the vanes. The radius of curvature of the ring segments outer surfaces is smaller than that of the vane ends so that the segments and vane ends contact each other over only a portion of their surfaces.Type: GrantFiled: July 28, 1980Date of Patent: May 31, 1983Assignee: Motoren und Turbinen Union Munchen GmbHInventor: Anton Zacherl
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Patent number: 4384820Abstract: A pump assembly wherein fluid under pressure in a pump housing is prevented from escaping around the drive shaft of the pump by a seal which is held in place by the combination of a spring and fluid pressure applied through a diaphragm from the interior of the pump housing.Type: GrantFiled: September 15, 1981Date of Patent: May 24, 1983Inventor: James O. Sims
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Patent number: 4373858Abstract: A valve arrangement responsive to a pressure differential continuously throttles air flowing through a labyrinth seal, allowing only a small fraction of the leakage that would otherwise occur. The arrangement accomodates radial and axial shaft displacement without rubbing contact. This avoids seal wear for high shaft rotating speeds, high temperatures and/or rapid temperature changes.Type: GrantFiled: December 10, 1980Date of Patent: February 15, 1983Assignee: The Bendix CorporationInventor: James M. Eastman
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Patent number: 4353604Abstract: A friction damper is mounted in series with a viscous damper to accommodate the normal magnitude vibration and the higher magnitude vibration occasioned from a larger imbalance of a jet engine rotor manifested by a bowed rotor and including a loading spring to allow the recentering of said friction damper when the higher magnitude vibrations subside.Type: GrantFiled: December 11, 1980Date of Patent: October 12, 1982Assignee: United Technologies CorporationInventors: Michael D. Dulberger, David H. Hibner, Donald C. Moringiello
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Patent number: 4334822Abstract: Circumferential gap seal for axial-flow machines including a metallic retaining flange mounted within the machine casing and which is connected to a metallic ring through flexible side walls, wherein the side walls, the metallic ring and the retaining flange are subdivided into a plurality of segments in the circumferential direction. The thereby formed radially directed gaps are sealed over the radial height of the side walls through flexible radial walls. The radial height is variable in dependence upon the measured size of the circumferential gap between the tip of the rotor blades of the machine and the metallic ring.Type: GrantFiled: June 4, 1980Date of Patent: June 15, 1982Assignee: MTU Motoren- und Turbinen-Union Munchen GmbHInventor: Axel Rossmann
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Patent number: 4325673Abstract: A diffuser for a centrifugal compressor has an annular array of vanes which is movable to vary the configuration of the diffusing passages between the vanes. Each vane includes suction and pressure surfaces joined at an inlet apex and divergent therefrom to form a wedge-shaped control surface between fixed, spaced parallel side walls of the diffuser and pivoted about the apex for varying flow area through the diffuser. Each vane has an elastomeric inner portion which is selectively inflatable to expand to either side of said wedge-shaped control surface to sealingly engage the spaced parallel side walls to seal against gas flow between the pressure surface and the suction surface on each of the vanes.Type: GrantFiled: March 10, 1980Date of Patent: April 20, 1982Assignee: General Motors CorporationInventor: Beuford C. Hall, Jr.
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Patent number: 4296934Abstract: The disclosure illustrates having a turbocharger housing and a turbine wheel shaft rotatable relative to one another and in which one of the members has a cylindrical surface and the other member contains an annular groove, a sealing ring being located in the annular groove and engaging the cylindrical surface. One of the radially extending walls of the sealing ring includes a chamfered portion such that the axial dimension of the radially inner surface of the sealing ring is less than the axial dimension of the radially outer surface of the sealing ring, the annular groove including a complementary shaped wedging surface for cooperation with the chamfered surface of the sealing ring.Type: GrantFiled: June 7, 1979Date of Patent: October 27, 1981Assignee: Holset Engineering Company LimitedInventor: Howard S. Atkin
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Patent number: 4289445Abstract: A pump assembly wherein fluid under pressure in a pump housing is prevented from escaping around the drive shaft of the pump by a seal which is held in place by the combination of a spring and fluid pressure applied through a diaphragm from the interior of the pump housing.Type: GrantFiled: September 25, 1978Date of Patent: September 15, 1981Inventor: James O. Sims
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Patent number: 4278396Abstract: This invention relates to a centrifugal pump characterized by a pair of novel self-aligning impeller hub seals located in the high pressure cavity and subjected to the influence thereof to maintain them in fluid-tight sealed contact with the adjacent cavity walls to which they are loosely fastened. The invention also encompasses a novel thrust-type hub seal subassembly that is continually biased into fluid-tight sealed contact with an annular abutment on the impeller hub, the latter element being the only surface in relatively movable frictional engagement with the seal with such engagement being face-to-face so that the thrust compensates for any wear therebetween. Another feature of the invention is the cooperative relationship between the self-aligning impeller hub seals, the thrust-type hub seal and pressure relief passages in the impeller hub whereby the thrust seal is isolated from the relatively higher fluid pressure in the high pressure cavity.Type: GrantFiled: May 15, 1978Date of Patent: July 14, 1981Inventor: John Vander Horst
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Patent number: 4260032Abstract: There is disclosed a turbodrill having an axial thrust bearing section which is contained within a lubricant chamber arranged within an annular space between the case and shaft of the turbodrill above the turbine section, and which is defined between means sealing between the shaft and the case which, in use of the turbodrill, are above the drilling fluid circulating therethrough.Type: GrantFiled: November 26, 1979Date of Patent: April 7, 1981Assignee: Engineering Enterprises, Inc.Inventor: Fred K. Fox
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Patent number: 4251185Abstract: A turbine shroud assembly includes an expansion control ring to support segmented rotor shrouds. The expansion control ring is restrained by adjacent manifold rings, yet free to thermally expand radially outwardly without loss of axial alignment with the associated turbine wheel. The ported manifold rings are positioned on either side of an outwardly extending leg of the expansion control ring to direct cooling fluid delivered thereto toward the expansion control ring. A spacer ring surrounds the expansion control ring and restrains the expansion control ring relative to the manifold rings. The spacer ring maintains axial alignment of the expansion control ring with the turbine wheel. Cooling fluid is exhausted into the main hot gas stream, both upstream and downstream of the turbine wheel thus substantially preventing hot gases from affecting the expansion control ring.Type: GrantFiled: May 1, 1978Date of Patent: February 17, 1981Assignee: Caterpillar Tractor Co.Inventor: Karl W. Karstensen
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Patent number: 4247247Abstract: A turbine blade tip seal assembly for controlling the blade tip clearance between a flexible outer shroud and the tips of a thermally expansible row of turbine blades on a turbine rotor includes a fixed outer shroud with a pressure deflectable wall portion thereon located in surrounding, radially outwardly relationship with blade tips on the blades of a turbine rotor and wherein an excessive blade tip to shroud wall spacing is maintained when the engine is at cold start conditions; said turbine blades of the turbine rotor expanding in response to increases in operating temperature within the engine during turbine engine operation to partially close the excessive blade tip to shroud clearance and further including pressurizable means responsive to turbine operation to produce pressure bias on the deflectable wall to cause it to be deflected raidally inwardly to further reduce the excessive blade tip clearance so as to produce a resultant operative clearance between the tip of the turbine rotor and the shroud tType: GrantFiled: May 29, 1979Date of Patent: January 27, 1981Assignee: General Motors CorporationInventor: Glenn W. Thebert
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Patent number: 4242040Abstract: The invention comprises a rotary fluid handling apparatus having first and second coaxial bodies mounted for relative axial movement therebetween and having respective opposed radially facing annular surfaces. The bodies may be, for example, the stator of a turboexpander or compressor and a relatively rotatable clamping ring for a plurality of adjustable blades. A first seal including a sealing ring is disposed between and seals between the annular surfaces, and the apparatus defines a first pressure zone which communicates with one axial side of the seal. The first body has a first stop engageable with the sealing ring to permit the force exerted on the sealing ring by the pressure of the first zone to be transmitted to the first body.Type: GrantFiled: March 21, 1979Date of Patent: December 30, 1980Assignee: Rotoflow CorporationInventor: Judson S. Swearingen
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Patent number: 4214796Abstract: An improved bearing assembly is provided for supporting a rotating shaft. The improvement is comprised of utilizing a resilient support means in combination with a multiple squeeze film damper apparatus. The damper apparatus provides a large damping force to suppress large vibrations and excessive radial shaft deflections in the event of operation with an abnormally high unbalanced shaft. The resilient support provides a soft spring system as a means for establishing and maintaining the critical rotor speed at a low speed condition, for centering the shaft during normal operation, and for allowing radial deflection during operation with an unbalanced shaft.Type: GrantFiled: October 19, 1978Date of Patent: July 29, 1980Assignee: General Electric CompanyInventors: Fred J. Monzel, Melvin Bobo