WO2023067336A1 - Pumping seal for rotating machines - Google Patents
Pumping seal for rotating machines Download PDFInfo
- Publication number
- WO2023067336A1 WO2023067336A1 PCT/GB2022/052665 GB2022052665W WO2023067336A1 WO 2023067336 A1 WO2023067336 A1 WO 2023067336A1 GB 2022052665 W GB2022052665 W GB 2022052665W WO 2023067336 A1 WO2023067336 A1 WO 2023067336A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- housing
- pressure
- seal
- gas
- rotating shaft
- Prior art date
Links
- 238000005086 pumping Methods 0.000 title claims description 14
- 230000013011 mating Effects 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 29
- 230000008878 coupling Effects 0.000 claims description 14
- 238000010168 coupling process Methods 0.000 claims description 14
- 238000005859 coupling reaction Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 description 12
- 238000004804 winding Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 239000000806 elastomer Substances 0.000 description 3
- 230000020169 heat generation Effects 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 101150114976 US21 gene Proteins 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
- F16J15/3408—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface
- F16J15/3412—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface with cavities
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3492—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member with monitoring or measuring means associated with the seal
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/124—Sealing of shafts
Definitions
- Exemplary embodiments pertain to the art of rotating machines and, in particular, to rotating machines that include a pumping seal.
- Electric machines include a stator having stator windings mounted to a housing and a rotor including rotor windings that rotates relative to the stator.
- the stator windings may be excited to impart rotational forces on the rotor or, the rotation of the rotor may induce an electrical current in the stator windings.
- electrical current passes to the stator windings in the second operating mode, electrical current passes from the stator windings.
- the rotor will rotate relative to the stator.
- the rotor can include either magnets or coils depending on the type of electric machine.
- Exemplary embodiments pertain to rotating machines, in particular, any machine where a shaft that can rotate within an enclosed housing that includes the pumping seal.
- the enclosed housing contains the shaft within a fixed volume gas environment.
- the gas environment can be, but is not always, atmospheric air.
- the pumping seal will extract gas from the fixed volume thereby reducing its pressure. With the pressure reduced, any heat generation (energy waste) due to shaft rotation and gas churning will be reduced.
- a rotary machine in one embodiment, includes a rotating shaft, a housing that surrounds a portion of the rotating shaft; and a gas seal that pumps gas out of the housing to reduce pressure in the housing to an operating pressure that is less than the initial pressure.
- the gas seal can pump gas out of the housing so that a pressure in the housing is less than atmospheric pressure.
- the pressure in housing can be reduced so that it is less than Vi atmospheric pressure such as less than 0.5 bar absolute.
- the rotating shaft can be a rotor of a motor or can include two portions joined together by coupling. If a coupling is used, it can be within the housing.
- the housing can include a bleed hole formed therein that allows gas to be drawn into the housing.
- the machine can include a valve that controls a flow of gas into the housing based on the pressure in the housing.
- the dry gas seal can include a mating ring that can be coupled to or part of the rotating shaft that rotates with the rotating shaft; and a primary ring.
- the machine can also optionally include a biasing member urges the primary ring towards the mating ring.
- the machine can include a sleeve ring that is coupled to the rotating shaft and carries the mating ring.
- a method of operating a rotating machine that includes a rotating shaft and a housing that surrounds a portion of the rotating shaft. This can be any of the machines disclosed or mentioned herein.
- the method includes sealing the shaft in the housing with a dry gas seal, establishing an initial pressure in the housing; and pumping gas out of the housing with the dry gas seal so that pressure in the housing is reduced from the initial pressure to a lower pressure.
- the initial pressure can be atmospheric and the lower pressure is less than Vi atmospheric pressure such as less than 0.5 bar absolute.
- the initial pressure can be higher than external environmental pressure and the lower pressure is less than the initial pressure.
- the rotating shaft is a rotor of a motor.
- the rotating shaft includes two portions joined together by a coupling that can optionally be within the housing.
- the housing can include a bleed hole formed therein and the method can also include drawing gas through the bleed hole into the housing to recharge the gas in the housing.
- the method can also include having a machine and a valve that controls a flow of gas into the housing and further comprise allowing gas to flow into the housing through the valve based on the pressure in the housing.
- FIG. 1 is a cross-sectional view of a rotating machine that includes a pumping dry gas seal
- FIGS. 2A-2D show views of different types of faces that may be utilized in the dry gas seal so that it can be used as a pump for a rotating machine;
- FIG. 3 is a cross-sectional view of a rotating machine that includes a pumping dry gas seal and a valve to restore gas into the chamber of the machine;
- FIG. 4 is a cross-sectional view of a rotating machine that includes a pumping dry gas seal and a bleed hole to charge or restore gas into the chamber of the machine;
- FIG. 5 is cross section one example of seal and could be used in embodiments and shows a gas path through the seal;
- FIG. 6 shows a machine that includes chamber that has two shafts joined by a coupling.
- embodiments herein are directed to systems and methods that can reduce the generation of heat due to churning.
- this can be accomplished by reducing the pressure of gas in the seal chamber where the rotor is rotating.
- the chamber is sealed by a dry gas seal.
- a dry gas seal may suitably refer to a gas seal (i.e. to prevent passage of gas from one area to another) such as a non-contacting mechanical gas seal.
- material carried in a gas such as vapors and aerosols may in some instances also be present.
- the dry gas seal can be utilized to pump gas out of the chamber and thereby reduce the churning and associated heat in the chamber.
- the pressure in the chamber can be reduced to below atmospheric in the region where it is operating. In one embodiment, it is reduced to Vi or less than atmospheric such as less than 0.5 bar absolute.
- FIG. 1 shows an example of rotating machine 1.
- the machine 1 illustrated could be a motor or generator, a vibrational damper, an alternator, a pump, a compressor, or a turbine, but the skilled artisan will realize the teachings herein are not so limited and could be applied to any machine with a rotating shaft.
- the machine 1 includes a rotating shaft 2 (e.g. a rotor) that is sealed within a chamber 3.
- the chamber 3 is shown as having a single opening 4 through which the shaft 2 passes out of the chamber 3 via an opening 9.
- the chamber could have multiple openings to accommodate situations where both ends of the shaft extend beyond the chamber 3. This can happen in a motor/generator as well as in the case of a coupling that is in a sealed chamber to name but few non-limiting examples.
- the chamber 3 is defined by a housing 5.
- the housing 5 can be a motor or turbine housing in one embodiment.
- element 6 connected to the shaft 2 and within the housing 3.
- the element can be rotor windings, rotor magnets a coupling, a flywheel, or gearing, to name but a few. Of course, other examples could exist.
- the opening 9 is filled at least partially or wholly by a dry gas seal 4.
- the seal 4 serves to pump gas out of the chamber 3 at a controlled rate.
- the path the gas takes is generally indicated by the arrow labelled “flow.”
- One or more bearings 7a, 7b may be provided within the housing 5 to support the rotating shaft.
- the first bearing 7a is shown as being outboard (direction A), of the seal 4 but the exact configuration can vary. As shown, the flow is radially inward (direction B) from the outer side of the seal 4 toward the shaft.
- direction A outboard
- direction B radially inward
- dry gas seals such as the seal 4 shown in FIG. 1 operate by providing a seal between a rotating ring and a stationary.
- the rotating ring is sometimes referred to as a “mating ring” as it is mated to the rotating shaft/rotor.
- the rotating ring can be mated to the rotor via a shaft sleeve.
- the stationary ring can sometimes be referred to as the primary ring and does not rotate during operation.
- a layer of gas is developed between the two rings that may form a seal or otherwise restrict flow while allowing the rings to move relative to one another without contacting each other.
- Grooves in the rotating (mating) ring draw the gas from a radial edge of the mating ring to a location in between the two rings.
- the gas that is drawn into the grooves is compressed as is moves toward the radially inward ends (or tips) of the grooves.
- the compressed gas creates a pressure dam that causes the primary ring to “lift off’ from the mating ring to form a running gap that is in the range of few microns (e.g., 3- 10 pm).
- the primary ring is typically mounted to a stationary portion of the dry gas seal by a compressible member such as a spring or other implement.
- a controlled amount of the gas flows (e.g., is pumped or otherwise allowed to move) over the dam area to the low-pressure side of the seal (e.g., outside of the sealed chamber), creating a controlled seal leakage, and the rings operate on the thin film of gas as a non-contacting seal.
- the controlled leakage can be utilized to, thus, pump gas out of the seal chamber and reduce the pressure therein. This can reduce heat in some embodiments.
- the gas is pumped out is indicated by the arrow labelled “flow.”
- One of the seal rings or mating rings includes surface texture patterns so that it can draw gas between rings to cause a separation, or lift off, between the rings to allow for non-contacting operation. While the specific illustrate surface texture patterns are grooves, this is not meant as limiting and any type of surface pattern could be used so long as it supports the above described separation or lift off and subsequent pumping of gas out of the chamber 3.
- Fig. 2a shows an example of generic seal face 200 that can be a seal face of either a seal ring or a mating ring (114, 116).
- the surface texture pattems/grooves 202 in this face 200 are unidirectional and extend from an outer diameter OD towards an inner diameter ID.
- Fig. 2b shows another example of a generic seal face 204 that can be a seal face of either a seal ring or a mating ring (114, 116).
- the surface texture patterns/grooves 206 in this face 204 are also unidirectional and extend from an inner diameter ID towards an outer diameter OD.
- Fig. 2c shows another example of a generic seal face 208 that can be a seal face of either a seal ring or a mating ring (114, 116).
- the surface texture features/grooves 202 in this face 208 are bidirectional and extend from an outer diameter OD towards an inner diameter ID.
- Fig. 2d shows another example of a generic seal face 220 that can be a seal face of either a seal ring or a mating ring (114, 116).
- the surface texture features 230 in this face 220 are bidirectional and extend from an inner diameter ID towards an outer diameter OD.
- the surface texture features/grooves As gas enters the surface texture features/grooves it is compressed as faces rotate relative one another to create the lift off force that causes the faces to separate.
- the surface texture patterns/grooves can have a depth that is sufficient based on the desired flow.
- the seal 4 can serve to reduce pressure in the chamber 3. This process, or pumping, can in one embodiment reduce the pressure in the chamber to a level that is below the ambient pressure surrounding the chamber.
- the seal can be arranged such that the gas can be pumped out of the chamber until approaching vacuum conditions, thus reducing the gas density for churning.
- a relief valve 301 would open, or the seal could be designed to open with reverse atmospheric pressure to refill the chamber 3 for the process to start again.
- a small bleed hole 401 (or any other form of charge facility) could continually charge the system close to vacuum as shown in FIG. 4.
- the gas seal may open with reverse pressure to recharge.
- the gas seal pumps gas out of the housing to reduce pressure in the housing to an operating pressure that is less than the initial pressure in the housing.
- the initial housing pressure can be defined as the pressure after sealing the shaft in the housing and before pumping gas out of the housing with the dry gas seal.
- reducing pressure reduces or eliminates the gas medium for churning and heat generation.
- the gas could Vi the pressure of the initial pressure or less.
- a thermal barrier can be established that will prevent the transfer of heat and high temperature.
- the extent to which the pressure is reduced can be affected by the initial pressure with high initial pressures being reduced typically more than lower pressures on a percentage basis.
- dry gas seals While not fully shown herein for the sake of brevity, examples of dry gas seals that could be used include those disclosed in PCT Application PCT/US21/25126 and U.S Patent Application No. 16/992,296 filed August 13, 2020, both of which are incorporated herein by reference in their entirety. Of course, not all parts of that seal or the one shown in FIG. 5 below are required and only two rings as discussed above may be needed. In particular, the labyrinth seals and the separation seal may not be needed.
- FIG. 5 is a partial cross-sectional view of the single non-contacting dry gas seal assembly 100 (or dry gas seal assembly for short). This assembly could be used to as the seal 4 shown in any prior embodiment.
- the teachings herein can be applied, however, to other dry gas seal configurations. As will be understood after reading the detailed description, the teachings herein can be applied to any type of dry gas seal including, without limitation single dry gas seals, tandem dry gas seals, tandem dry gas seals with intermediate an intermediate labyrinth, triple seals with or without a labyrinth and double opposed dry gas seals.
- At least a portion of the dry gas seal assembly 100 is positioned between a rotating shaft 2 and the housing 5.
- a mating ring can be formed as part of the shaft 2 or otherwise attached to the shaft 2.
- the rotating shaft can be part of any rotating machine and may actually be a shaft formed of two parts (2a and 2b) that are joined together by a coupling 2c (see FIG. 6) that is contained within the chamber 3 defined by the housing 5.
- the shaft 2 can be supported by the housing 5 via a bearing (not shown) disposed in a bearing cavity 108 of the housing 5.
- the stator elements could be part of the housing rather than including their own retainer elements.
- the housing 5 includes a bore 109 formed in it that extends between the chamber 3 and a bearing cavity 108 and defines an annular seal chamber 112 into which the dry gas seal assembly 100 may be inserted.
- the chamber includes the gas that is to be pumped out by the seal 4.
- An optional shroud 126 that may include a labyrinth seal and which extends over a radially extending opening formed between the rotating shaft 2 and the housing 5 may be provided to inhibit the free flow of gas from the chamber 3 into the bore 109.
- the shroud 126 is disposed in the bore 109 and, as illustrated carries a labyrinth seal 128 that serves to totally or partially prevent the free flow of process gas from the process cavity 106 into the bore 109.
- the labyrinth seal 128 includes a plurality of ridges 134.
- the ridges 134 are disposed close to an outer surface 136 of the rotating shaft 102.
- the plurality of ridges 134 and the corresponding intermediate cavities formed between any two consecutive ridges 134 impede the ingress of gas from the process cavity 106 into the seal chamber 112 by way of the rotating shaft 2.
- the dry gas seal assembly 100 illustrated in FIG. 5 includes a single dry gas seal that is generally referenced as first seal 110.
- first seal 110 typically, the components of the first seal 110 are preassembled into a cartridge and then disposed in the seal chamber 112.
- the cartridge 118 includes a stator 117 that can be formed of one or more components and joined in a fixed relationship to one another as well as with the compressor housing 104 when installed.
- the stator 117 includes a retainer ring 117a that can be sealed to the chamber 3 by a sealing element such as a radial seal 140.
- the cartridge 118 can also include a sleeve ring 115 that can be formed of one or more components and that is attached to the rotating shaft 2 such that it rotates with the rotating shaft 2.
- a cartridge can be omitted.
- the mating ring could be part of the shaft and the primary ring can be built into the housing.
- the illustrated sleeve ring 115 includes two portions 115a, 115b in FIG. 5.
- the sleeve 115 includes a rotating ring 115a that is configured to contact and rotate with the rotating shaft 2.
- a spacer sleeve 115b is included as part of the sleeve 115.
- the sleeve ring 115 could be formed as a unitary piece or could include any number of pieces that are either joined together or otherwise held stationary relative to each other during operation (e.g., all pieces rotate together as one).
- the illustrated cartridge 118 also includes what is sometime referred to as a separation seal 119.
- the separation seal 119 is not required as part of dry gas seal in general and may be a separate element that is joined to a dry gas seal.
- the separation seal can serve to prevent or reduce oil or other lubricants from a bearing (not shown) disposed in the bearing cavity 108 from entering the first seal 110.
- the separation seal 119 may also prevent or reduce the ingress of contaminates from an external environment. Contaminates may for example include one or a combination of dirt, debris, or other undesired particles or liquids.
- the separation seal 119 is not required in certain embodiments. That is, embodiments herein do not require that the separation seal as part of the cartridge 118. Further, as shown in one or more of the following embodiments, if present, the separation seal 119 need not be adjacent the first seal 110 and one or more other seals could be provided between the first seal 110 and the separation seal 119.
- Axial movement of the sleeve ring 115 relative to the rotating shaft 102 is limited by a shaft thrust ring 125 received in a groove in the rotating shaft 102.
- Axial movement of the stator 117 is limited by stator thrust ring 121 received in a groove in the housing 5.
- shaft thrust ring 125 can be fixed relative to the sleeve ring 115 so that the two elements rotate together. Also, for sake of completeness, it shall be understood that other elements can be attached to the sleeve ring 115 to provide support or other functions but are not specifically described herein.
- One optional example is a mating ring position fixing element 115c.
- the sleeve ring 115 carries and otherwise mates rotating or mating ring 114 to the rotating shaft 2. That is, the sleeve ring 115 being mated to the rotating shaft 102 allows the mating ring 114 to also rotate with the shaft 102.
- the mating ring 114 can include one or more grooves (not shown) formed on a face thereof. Examples of such grooves as shown above in FIG. 2.
- the primary ring 116 can also be referred as stationary ring as it does not rotate with the shaft and is thus, generally or completely, rotationally stationary relative to the housing during operation.
- Reference numeral 113 identifies the location of the seal interface formed between the mating ring 114 and the primary ring 116.
- primary ring 116 is axially movable relative to the housing 104 during operation such that a controlled distance may be maintained between the mating ring 114 and the primary ring 116 at the seal interface 113.
- a spring force is applied to the primary ring 116 by one or more biasing members 138 disposed between the retainer ring 117a and the primary ring 116.
- gas is present in the chamber 3. The gas is present in a so-called seal chamber 112 and its path through the seal is shown arrows 150.
- a carrier ring 170 is provided as a means for allowing the required movement.
- the carrier ring 170 is coupled to the retainer ring 117a by the biasing members 138.
- the biasing members 138 can be a singular element or composed of a plurality of elements.
- the biasing members 138 are comprised of one or more springs in one embodiment.
- the biasing members 138 can allow for the primary ring 116 to keep a constant distance during operation between itself and the mating ring 114 even as the mating ring 114 moves axially due to such movement of the rotating shaft 102.
- one or more radial seals may be provided.
- the seals may be formed of a polymer or an elastomer and one example of such a seal is a lip seal.
- the seal is illustrated as a lip seal but that is by way of example only and not meant to be limiting.
- a first seal 172 can be provided between retainer ring 117a and the carrier ring 170.
- the first seal 172 is fixed relative to the retainer ring 117a in one embodiment.
- This first seal 172 can be arranged such that the sealing gas follows path 150 and causes it to expand when gas impinges upon.
- the first seal 172 is, thereby, a so-called contact seal.
- a seal may also be provided between the primary ring 116 and the carrier ring 170, which may suitably be formed from a polymer or an elastomer.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22797450.8A EP4420221A1 (en) | 2021-10-19 | 2022-10-19 | Pumping seal for rotating machines |
CN202280069734.8A CN118104109A (en) | 2021-10-19 | 2022-10-19 | Pumping seal for rotary machine |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US202163257273P | 2021-10-19 | 2021-10-19 | |
US63/257,273 | 2021-10-19 | ||
GB2207068.4 | 2022-05-13 | ||
GB2207068.4A GB2612157A (en) | 2021-10-19 | 2022-05-13 | Pumping seal for rotating machines |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023067336A1 true WO2023067336A1 (en) | 2023-04-27 |
Family
ID=84044138
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2022/052665 WO2023067336A1 (en) | 2021-10-19 | 2022-10-19 | Pumping seal for rotating machines |
Country Status (2)
Country | Link |
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EP (1) | EP4420221A1 (en) |
WO (1) | WO2023067336A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3421734A1 (en) * | 2017-05-24 | 2019-01-02 | Rolls-Royce plc | Preventing electrical breakdown |
WO2021202693A1 (en) * | 2020-04-03 | 2021-10-07 | John Crane Inc. | Non-contacting seal including an interference fit seal ring |
-
2022
- 2022-10-19 WO PCT/GB2022/052665 patent/WO2023067336A1/en active Application Filing
- 2022-10-19 EP EP22797450.8A patent/EP4420221A1/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3421734A1 (en) * | 2017-05-24 | 2019-01-02 | Rolls-Royce plc | Preventing electrical breakdown |
WO2021202693A1 (en) * | 2020-04-03 | 2021-10-07 | John Crane Inc. | Non-contacting seal including an interference fit seal ring |
Also Published As
Publication number | Publication date |
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EP4420221A1 (en) | 2024-08-28 |
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