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Gap or clearance

Subclass of:

277 - Seal for a joint or juncture

277345000 - SEAL BETWEEN RELATIVELY MOVABLE PARTS (I.E., DYNAMIC SEAL)

277409000 - Close proximity seal (e.g., contactless, fluent, etc.)

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
277412000 Labyrinth 66
277422000 Floating ring or bushing 5
20080296847Packing ring with dovetail feature - A packing ring in a multi-staged turbine that includes two ring segments joined by a dovetail feature. In some embodiments, the dovetail feature may include a male/female configuration. In other embodiments, the dovetail feature may include an insert/groove configuration. The insert of the insert/groove configuration may include a protrusion that extends from an approximately flat surface of an end of one of the ring segments. The groove of the insert/groove configuration may include a notch in an approximate flat surface of an end of one of the ring segments. The insert of the insert/groove configuration and the groove of the insert/groove configuration may be of a similar size such that the insert closely fits within the groove.12-04-2008
20120032404LOW DEFLECTION BI-METAL ROTOR SEALS - A seal assembly for use in a turbomachine is provided. The seal assembly has an annular division wall with outside and inside surfaces, a carrier ring disposed adjacent the inside surface of the annular division wall, and a sealing substrate metallurgically-bonded to an inner-most surface of the carrier ring. The sealing substrate is machined to form a seal surface that can be disposed proximate a rotor and maintained substantially parallel thereto during operation of the turbomachine.02-09-2012
20090243222Sealing arrangement for a gas turbine - A sealing arrangement includes a radially inner first part 10-01-2009
20090289420SHAFT SEAL ASSEMBLY FOR HYDROGEN COOLED TURBINE GENERATOR - A seal assembly forming a seal with a rotatable shaft of a hydrogen-cooled generator is provided. The seal assembly includes a ring assembly disposed about the rotatable shaft. The ring assembly includes a fluid inlet and a fluid outlet. A hydrogen side ring is coupled to a generator frame of the generator. An insulating structure is positioned between the hydrogen side ring and the generator frame to provide electrical insulation between the hydrogen side ring and the generator frame. An air side ring is disposed adjacent to the hydrogen side ring and the seal structure is coupled to the air side ring. Structure for supplying oil to the ring assembly is provided, such that the oil flows through the ring assembly to an interface between the rotatable shaft and the seal structure so as to substantially limit direct contact between the rotatable shaft and the seal structure.11-26-2009
20120211944SELF-ADJUSTING SEAL FOR ROTATING TURBOMACHINERY - A self-adjusting seal has a movable seal member fitted in a groove of a dummy ring along a rotor. The movable seal member is biased outwardly in a radial direction by a disc spring, and a gap between the movable seal member and the rotor is large during the start-up or shutdown of rotating turbomachinery. On the other hand, during a rated operation of the rotating turbomachinery, by a fluid having flown into the internal portion of the groove via a gap between a high pressure side end surface of the movable seal member and the groove, the movable seal member is pressed toward the rotor against a biasing force of the disc spring.08-23-2012
Entries
DocumentTitleDate
20080246223NON-CONTACT SEAL FOR A GAS TURBINE ENGINE - 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 that influences 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.10-09-2008
20130161911SEAL FOR ENERGY RECOVERY WHEELS HAVING SPACED APART LATERAL WALLS - The present relates to a seal for an energy recovery wheel. The seal comprises a main body defining an inner surface, and a pair of lateral walls extending from each lateral side of the main body. Each lateral wall respectively comprises a free edge defining a lip. The inner surface and lateral walls define a space therebetween. The seal provides for air travelling from one section of the energy recovery wheel to another to turbulate within the space. The inner surface is generally flat and the space may comprise a cavity. The lateral walls may be flexible or rigid. The present also relates to a combination of the seal with the energy recovery wheel.06-27-2013
20110304101FILM RIDING PRESSURE ACTUATED LEAF SEAL ASSEMBLY - In accordance with embodiments of this invention, a pressure actuated leaf seal assembly is provided that includes film riding, hydrodynamic/hydrostatic runners under seal member leaf ends. Leaf seal assemblies according to embodiments of this invention maintain the runner away from a rotating body until adequate rotating speed is present to generate lift required to allow the runner to float on a thin film of operating fluid on the rotating body, so that the runner does not rub the rotating body. In addition, runners are attached, or added, to leaf seal members such that the runners move in a radial direction, while remaining parallel to the rotating body. In one embodiment, a runner can comprise a separate structure coupled to a leaf seal member, and in another embodiment, a runner can comprise a wear-resistant pad on a distal end of a leaf seal member.12-15-2011
20100219586QUICK RELEASE BELLOW SEAL GUARD - A quick release bellow seal guard for use with a shaft assembly having a first guard member having an open central region and a second guard member releasably coupled to the first guard member also having an open central region. The first guard member further includes a wall extending from a base portion to a distal end. The second guard member further includes a proximal end releasably coupled to the distal end of the first guard member to collectively define an interior guard volume. The quick release bellow seal guard further includes a seal member sealingly engaging at least one of the first guard member and the second guard member and further sealingly engaging the shaft assembly. The seal member is positioned within the interior guard volume.09-02-2010
20120098205SEALING ASSEMBLY FOR A ROLLING BEARING - A sealing assembly for a rolling bearing. The sealing assembly has at least one cover element for covering a bearing gap along a cover plane. The cover element has a securing section, a sealing collar, a base part connecting the securing section and the sealing collar, and at least one sealing surface provided on the sealing collar for non-contact sealing. At a starting section the sealing collar extends from the base part diagonally toward the inner side of the cover element facing the bearing interior and at an end section the sealing collar extends from the inside toward the outer side of the cover element facing away from the bearing interior. At the same time, the sealing collar forms a sealing surface substantially perpendicular to the cover plane and at the end of the end section at least one edge impeding the inflow of impurities into the bearing interior.04-26-2012
20090085303ROTATING WHEEL MECHANISM OF CONSTRUCTION MACHINE AND DRIVE WHEEL MECHANISM OF CONSTRUCTION MACHINE - A floating seal is provided between the fixed housing and the drive wheel, and an outside seal is provided so as to cover the outer circumference of the floating seal. The outside seal is composed of a gap between the fixed seal member secured to the fixed housing serving as a vehicle body and the rotating seal member rotatably secured integrally with the drive wheel. Blades that rotate on the outer circumference of the outside seal are provided on the outer circumference of the rotating seal member so as to protrude therefrom. By means of the blades, dirt accumulated in the fixed housing is scraped off. Therefore, dirt is prevented from being accumulated on the outer circumference of the outside seal, wherein it is possible to prevent dirt from entering the position of the floating seal and to appropriately discharge the dirt that has entered to the outside.04-02-2009
20100032908SEAL - This invention relates to a seal for sealing between a stator and rotor, including a generally annular carrier (02-11-2010
20090309311Methods and apparatus to facilitate sealing in rotary machines - A method and seal assembly for a rotary machine including a rotary component and a stationary component is provided. The method includes providing a seal housing including a front plate and a back plate that is spaced from the front plate such that a cavity is defined between the front plate and the back plate. The method also includes coupling a plurality of flexible compliant plates to at least one of the seal housing and the stationary component such that the compliant plates are spaced from the front plate and the back plate within the cavity, and coupling at least one projection to at least one of the seal housing and the compliant plates such that the at least one projection facilitates reducing flow through at least one of a first axial gap and a second axial gap that are defined between the seal housing and the compliant plates.12-17-2009
20090243221LEAF SEAL FOR A TURBOMACHINE - A leaf seal is provided for sealing a radial gap between a stator and rotor of a turbo machine. The seal includes a plurality of metallic sealing leaves, arranged in a row and attached to a carrier. The leaves are arranged concentrically around the circumference of the rotor and are arranged inclined at an angle to the radial direction of the rotor and in an opposite direction to the rotation direction and also includes front and rear plates connected to the carrier and extend over a circumference of the seal on both sides of the sealing leaves. A first axial distance is defined between the rear plate and the sealing leaves, and a second axial distance is defined between the front plate and the sealing leaves. An apparatus is also included for actively controlled variation of the first axial distance during operation of the turbomachine.10-01-2009
20100176556Method Of Manufacturing Of A Compliant Plate Seal Assembly - A compliant plate seal manufacturing method is provided. The method includes assembling a plurality of compliant plates and a plurality of spacer shims into a weld fixture, thereby forming a leaf pack having a front and rear end and sides and a curvature, welding the sides of the leaf pack to hook plates on the weld fixture, removing a portion of the weld fixture, removing a portion of the hook plates and applying a radial flow plate to the leaf pack.07-15-2010
20110057396Air Riding Seal - An improved air-riding seal system for turbine engines is presented. The seal system includes a movable primary seal assembly, a stationary secondary seal assembly, and at least one structure to increase the stiffness of a thin film between the primary seal and a rotating component. The primary seal assembly includes an annular seal ring and an arcuate support arm. The annular seal ring has a cross section that is substantially L-shaped and a surface with a step face and a circumferential dam. The arcuate support arm has a tooth at one end adjacent to an outermost circumferential surface along the seal runner, which could include an optional notch. The tooth and outermost circumferential surface are separated by a gap. The secondary seal ring is disposed between and contacts the primary seal assembly and housing structure so as to form a bore seal and a face seal therewith. A plurality of hydrodynamic pockets disposed along the circumferential dam and/or a plurality of radial dams disposed along the surface in an outward radial arrangement from the circumferential dam are provided to improve the stiffness of the thin film. Features of the invention allow for higher operating speeds.03-10-2011
20100219587WHEEL SEAL - A wheel seal is mainly provided with an annular internal sleeve oil seal. An annular concave inwards is formed at one side of the internal sleeve oil seal to contain one end of an annular outer annular member. A gap is kept between the internal sleeve oil seal and the outer annular member to contain an anti-friction ring and a second barrier. A labyrinth zone that is up and down is formed in the second barrier. Thus, the anti-friction ring is used to not only block foreign matters from entering the wheel seal through the gap and then being damaged, but also effectively transfer the strength from the inner annular member to the outer annular member at the time of installation for increasing the success rate of installation.09-02-2010
20090066033BARRIER SEALING SYSTEM - A barrier seal system comprises a rotatable shaft disposed within an outer housing. The rotatable shaft axially extends from a high-pressure region to a low-pressure region within the outer housing. At least a portion of the rotatable shaft, typically the portion disposed adjacent to the low-pressure region, comprises an oleophobic surface. The system further comprises a barrier seal that radially extends from the outer housing to the rotatable shaft and defines a gap between the barrier seal and the rotatable shaft. A barrier gas injector is provided for injecting a barrier gas into the gap to flow from the high-pressure region to the low-pressure region.03-12-2009
20120200044LEAF SEAL DEVICE - A leaf seal device having a connection holding section of a sealing plate which is bent at a first bending section. A plurality of laminated sealing plates are engaged sequentially at the first bending section. An inclined face at an inner circumferential side of the connection holding section, a pitch and a space of a sealing section are changed.08-09-2012
20080272553Compliant Plate Seals for Turbomachinery - 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 one of the static shell and the rotating shaft 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 harrier to axial leakage flow between the compliant plate members.11-06-2008
20100025936Leaf Seal Arrangement - A leaf seal arrangement is provided in which within a housing there are edge portions to inter associate with non parallel chamfer edges in leaf seal elements. In such circumstances, deflection of the leaf seal elements in an outward direction or inward direction relative to a rotating shaft creates variation in a control gap X, XX between the edges and the chamfer edge. Such increase or decrease in the control gap X, XX adjusts the aerodynamic radial force that is presented to the leaf seal elements whereby those elements can be more accurately maintained at a desired leaf position for optimizing leakage whilst achieving better wear resistance performance.02-04-2010
20080309018Seal arrangement - Leaf seal arrangements 12-18-2008
20120007318SEAL INCLUDING FLEXIBLE SEAL STRIPS - A seal member for effecting a seal preventing fluid flow in an axial direction through an annular space formed between two relatively moving components including a rotatable shaft and a stator structure. The seal member includes a plurality of flexible seal strips. Each seal strip includes a planar plate extending radially through the annular space and having a radially outer end supported to the stator structure and a radially inner end defining a tip portion extending widthwise in the axial direction engaged in sliding contact with a peripheral surface of the rotatable shaft. At least one of the seal strips includes a plurality of perforations extending through the seal strip and located between a leading edge and a trailing edge of the seal strip for effecting an increased flexibility of the seal strip adjacent to the tip portion.01-12-2012
20120007317AXIALLY ANGLED ANNULAR SEALS - A seal member for effecting a seal preventing fluid flow in an axial direction through an annular space formed between a rotatable shaft and a stator structure. The seal member includes a plurality of flexible seal strips extending radially through the annular space and having a radially outer end supported to the stator structure and a radially inner end defining a tip portion extending widthwise in the axial direction for engaging in sliding contact with a peripheral surface of the rotatable shaft. The seal strips are mounted to the stator structure with the tip portions of the seal strips at an angle to the axial direction. Each of the tip portions are formed with a curvature in a radially extending plane between a leading edge and a trailing edge of each seal strip.01-12-2012
20120261884SHAFT SEAL DEVICE AND ROTARY MACHINE INCLUDING SHAFT SEAL DEVICE - There is provided a shaft seal device comprising a seal piece-laminated body (10-18-2012
20120280458HYDRODYNAMIC NON-CONTACTING SEAL - A hydrodynamic non-contacting seal wherein the sealing surface of a rotatable sealing member is grooved in a spiral pattern such that the depth of the grooves decreases in a direction opposite to the direction of rotation of the rotatable sealing member.11-08-2012
20080224417LOW LEAKAGE PLUNGER ASSEMBLY FOR A HIGH PRESSURE FLUID SYSTEM - A fluid control device for use in a high pressure fluid system, the device including a device body with a cavity and a high pressure circuit, a plunger positioned for reciprocal movement in the cavity, and a leakage reduction cap mounted to the plunger for reducing fluid leakage flow. In one implementation, the leakage reduction cap includes a flexible portion positioned between the device body and the plunger, and defining an annular clearance gap between the leakage reduction cap and the device body. The flexible portion of the leakage reduction cap resiliently flexes radially outwardly in response to fluid pressure forces to reduce the annular clearance gap so as to minimize fluid leakage flow through the annular clearance gap.09-18-2008

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