US20180017166A1 - Rotary face seal with magnetic repelling loading - Google Patents
Rotary face seal with magnetic repelling loading Download PDFInfo
- Publication number
- US20180017166A1 US20180017166A1 US15/649,206 US201715649206A US2018017166A1 US 20180017166 A1 US20180017166 A1 US 20180017166A1 US 201715649206 A US201715649206 A US 201715649206A US 2018017166 A1 US2018017166 A1 US 2018017166A1
- Authority
- US
- United States
- Prior art keywords
- seal
- ring
- cup
- shaft
- face
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- 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
- F16J15/3436—Pressing means
-
- 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
- F16J15/002—Sealings comprising at least two sealings in succession
-
- 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
- F16J15/3404—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
- F16J15/3416—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 with at least one continuous groove
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- 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
- F16J15/3436—Pressing means
- F16J15/3444—Pressing means by magnetic attraction
-
- 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
- F16J15/3464—Mounting of the seal
- F16J15/348—Pre-assembled seals, e.g. cartridge seals
-
- 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
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
- F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
-
- 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
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3268—Mounting of sealing rings
Definitions
- the invention relates generally to mechanical rotary face seals.
- Such mechanical rotary face seals are typically used to seal media (gas or fluid) between the shaft and the housing where one is stationary and the other is rotating.
- These seals are used in the aerospace industry, commercial industry, nuclear industry, and other high reliability industries, such as, test equipment and race car engines and transmissions or the like.
- Standard mechanical rotary face seals use a spring mechanism for the mechanical load that provides positive contact against the rotary mating surface that is either a separate ring attached to shaft, shaft flange or end face, or a bearing inner race.
- the loading of the spring mechanism can have a large variation caused by operating range (stroke) length, compromised when it's natural frequency is reached during operation from shock and vibration, and load reduction (weakening) due to material fatigue under cyclic loading and temperature extremes.
- U.S. Pat. No. 3,708,177 for Magnetic Seal for a Rotary Shaft and Magnet Therefor addresses the well-known eddy current issue but it is unknown if the design was commercially feasible.
- U.S. Pat. No. 4,795,168 for a Magnetic Seal Assembly does not address the eddy current issue because the magnet inserts rotate.
- U.S. Pat. No. 5,078,411 for Variable Magnetic Rotary Seal does not address the eddy current issue because the magnet inserts rotate.
- U.S. Pat. No. 5,730,447 for Self-Aligning Magnetic Rotary Seal also does not address the eddy current issue because the magnet inserts rotate.
- U.S. Pat. No. 6,805,358 for Magnetic Seal also does not address the eddy current issue because either the magnet inserts rotate or the magnetically attractive member is exposed to continuously changing north and south poles during rotation.
- FIGS. 1 and 2 show an example of such a prior art rotary face seal 10 in detail. It includes an anti-rotation design that uses two (2) tangs 12 on the seal case 16 that engage slots 14 in the cup 18 which permits fluid movement in this area. It has a removable “take apart” cartridge design that facilitates repair, replacement and inspection of internal parts. It has a solid outside diameter cup option with internal milled tangs 12 and seal case slots 14 .
- FIG. 1 shows an embodiment with outward radial tangs 24 on the seal case 16 that engages slots in the cup 18 .
- FIG. 2 shows a solid outer diameter option with internal radial tangs 26 in the cup 18 that engages the slots in the seal case 16 .
- High pressure, low pressure and reverse pressure capability is achieved within the same cartridge by adjusting the diameters of the seal ring 20 . Since it does not employ magnets, there is unrestricted selection of materials for construction. However, the slotted OD design is not practical for all applications with the majority using the internal milled tangs 12 with slots 14 in the seal case 16 . There is spring load variation due to operating range and the spring load decreases as the seal ring 20 wears compromising re-seating. A wave spring 22 resides between the seal case 16 and the cup to spring-bias them apart. Also, the natural frequency of wave spring 22 is unknown and could cause loading issues under shock and vibration conditions.
- the rotary mating surface which bears against the seal ring 20 mating surface 20 a is not always part of the seal design, namely, the bearing inner race face, integral with the shaft (not shown) and the mating ring (not shown) obtained from multiple suppliers.
- the present invention preserves the advantages of prior art rotary face seals. In addition, it provides new advantages not found in currently available rotary face seals and overcomes many disadvantages of such currently available rotary face seals.
- the invention is generally directed to the novel and unique rotary face seal that has magnetic repelling loading.
- the rotary face seal with magnetic loading of the present invention replaces a conventional mechanical spring mechanism with opposing/repelling magnets where the magnetic technology provides a spring-like biasing effect to provide a consistent load with minimal variation, which is not affected by natural frequency and material fatigue due to cyclic loading. This improves seal performance and service life by eliminating the issues that compromise the effectiveness of the spring mechanism.
- the magnetic technology replaces the mechanical spring mechanism preferably within a stationary cartridge with a “pusher” type magnetic assembly design. As a result, such a stationary cartridge of the present invention is an exact exchange or “drop-in” solution to replace known seal that use mechanical wave springs.
- FIG. 1 is a cross-sectional view of a first known prior art rotary seal construction that uses conventional wave springs
- FIG. 2 is a cross-sectional view of a second known prior art rotary seal construction that uses conventional wave springs
- FIG. 3 is a cross-sectional view of a first embodiment of the invention.
- FIG. 4 is a cross-sectional view of a second embodiment of the invention with hydrodynamic lift-off grooves in the seal face of the rotating mating ring;
- FIG. 5 is an end view of the seal face of the rotating mating ring showing the hydrodynamic lift-off grooves.
- the rotary face seal 100 of the present invention with magnet repelling loading replaces the mechanical spring mechanism with magnetic technology to provide a consistent load with minimal variation, which is not affected by natural frequency and material fatigue due to cyclic loading. This will improve seal performance and service life by eliminating the issues that compromise the effectiveness of the spring mechanism.
- the present invention with its magnetic “spring” technology, replaces the mechanical spring mechanism of the prior art of FIGS. 1 and 2 with the stationary cartridge of the present invention with a pusher type magnetic assembly design that results with the stationary cartridges being an exact exchange.
- the rotary face seal 100 of the present invention is shown to include a basic cartridge rotary face seal that is comprised of a cup 102 , seal case 104 with inserted seal ring 106 that fits into the cup 102 with an anti-rotation feature that includes a retaining ring 108 that resides in a groove 110 in the cup 102 .
- the cup 102 resides in a stationary housing 120 to complete the drop-in cartridge configuration.
- This anti-rotation structure prevents the seal case 104 from rotation when the seal ring 106 contacts a rotating mating face of a rotating mating ring 112 that is rotates with shaft 114 due to being held in place by O-ring 116 in seat 112 c. Such rotation is prevented as well relative to the shaft end face 114 a or integral flange face, bearing inner face (not shown).
- any type of configuration may be used for attaching the rotating mating ring 112 to the shaft 114 , such as the use of O-rings, as shown.
- an internal O-ring 118 resides in the cup 102 which interfaces with the seal case 104 to provide a secondary seal while allowing axial movement of the seal case 104 within the cup 102 along the shaft axis 114 b.
- the seal case 104 is preferably a metal alloy, as is well-known in the art.
- Known 0 -ring designs and materials may be used, which are known in the art for the purposes indicated herein. For example, various elastomers may be used, which may or may not be pre-swollen.
- An internal retaining ring 108 in the cup 102 that prevents the seal case 104 from becoming disengaged from the cup 102 .
- a pair of magnets 120 a and 120 b are provided in the cavity defined by the space between the cup 102 and the seal case 104 .
- the pair of magnets are a magnetic pusher assembly that is in the cup 102 and contacts the adjacent flange 104 a of the seal case 104 when the seal ring 106 is mated to the mating face 112 a of the rotating mating ring 112 while carrying out operation of the seal with a range of motion indicated as B in FIG. 3 .
- the magnets 120 a and 120 b are preferably a pair of magnets that repel each other.
- the magnets 120 a and 120 are each preferably of a unitary annular shape to reside within the annular-shaped cavity defined between the cup 102 and seal case 104 discussed herein.
- the opposing/repelling magnets may each be made of a number of separate magnet members to suit the application at hand to provide the designed magnetic field and circuit.
- the repelling magnet force may also be a drop-in repelling magnetic cartridge-like solution offered by the Polymagnet company under the mark POLYMAGNET, for example as an alternative, which can maintain the seal case 104 in the cup 102 thereby eliminating the internal retaining ring and provide the mechanical load in the spring when the seal case 104 is mated against the rotary mating face 112 a during operation.
- the force, travel and the repelling profile of the magnets may be further modified to suit the application at hand.
- the seal ring 106 may be any material suitable for the application at hand, such as carbon graphite, and the like.
- the magnets 120 a and 120 provide an outwardly directed spring-biasing, as shown by arrows A in FIG. 3 .
- the rotary face seal of the present invention eliminates the risks associated with prior art designs.
- FIGS. 4 and 5 an alternative embodiment 200 of the first embodiment 100 of the present invention of FIG. 3 is shown.
- the alternative embodiment 200 is similar to the first embodiment except that the rotating mating ring 212 has a bearing surface 212 a which incorporates lift-off technology using hydrodynamic grooves 250 , as can be best seen in FIG. 5 , which is an end view of the bearing face 212 a of the rotating mating ring 212 .
- FIG. 5 is an end view of the bearing face 212 a of the rotating mating ring 212 .
- the configuration of the grooves 250 is shown by way of example, and it should be understood that any type, configuration and array of grooves 250 may be used in connection with the alternative embodiment 200 to provide the benefits of such hydrodynamic lift-off grooves.
- the alternative embodiment 200 has all of the same other components as the first embodiment, such as a cup 202 , seal case 204 , with seal ring 206 that is pushed outwardly by magnets 220 a, 220 b.
- the seal ring 206 bears against the rotating mating ring 212 .
- the entire seal assembly 200 receives a shaft 214 to be sealed.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Mechanical Sealing (AREA)
Abstract
Description
- This patent application claims priority to earlier filed U.S. Provisional Application Ser. No. 62/362,348, filed Jul. 14, 2016 the entire contents of which are incorporated herein by reference.
- The invention relates generally to mechanical rotary face seals. Such mechanical rotary face seals are typically used to seal media (gas or fluid) between the shaft and the housing where one is stationary and the other is rotating. These seals are used in the aerospace industry, commercial industry, nuclear industry, and other high reliability industries, such as, test equipment and race car engines and transmissions or the like.
- There are a number of problems and concerns typically associated with known mechanical rotary face seals. Standard mechanical rotary face seals use a spring mechanism for the mechanical load that provides positive contact against the rotary mating surface that is either a separate ring attached to shaft, shaft flange or end face, or a bearing inner race. The loading of the spring mechanism can have a large variation caused by operating range (stroke) length, compromised when it's natural frequency is reached during operation from shock and vibration, and load reduction (weakening) due to material fatigue under cyclic loading and temperature extremes.
- There have been a number of attempts in the prior art to address these common problems.
- For example, U.S. Pat. No. 3,708,177 for Magnetic Seal for a Rotary Shaft and Magnet Therefor addresses the well-known eddy current issue but it is unknown if the design was commercially feasible. U.S. Pat. No. 4,795,168 for a Magnetic Seal Assembly does not address the eddy current issue because the magnet inserts rotate. U.S. Pat. No. 5,078,411 for Variable Magnetic Rotary Seal does not address the eddy current issue because the magnet inserts rotate. U.S. Pat. No. 5,730,447 for Self-Aligning Magnetic Rotary Seal also does not address the eddy current issue because the magnet inserts rotate. U.S. Pat. No. 6,805,358 for Magnetic Seal also does not address the eddy current issue because either the magnet inserts rotate or the magnetically attractive member is exposed to continuously changing north and south poles during rotation.
-
FIGS. 1 and 2 show an example of such a prior artrotary face seal 10 in detail. It includes an anti-rotation design that uses two (2)tangs 12 on theseal case 16 that engageslots 14 in thecup 18 which permits fluid movement in this area. It has a removable “take apart” cartridge design that facilitates repair, replacement and inspection of internal parts. It has a solid outside diameter cup option withinternal milled tangs 12 andseal case slots 14.FIG. 1 shows an embodiment with outwardradial tangs 24 on theseal case 16 that engages slots in thecup 18. As a further variation,FIG. 2 shows a solid outer diameter option with internalradial tangs 26 in thecup 18 that engages the slots in theseal case 16. - High pressure, low pressure and reverse pressure capability is achieved within the same cartridge by adjusting the diameters of the
seal ring 20. Since it does not employ magnets, there is unrestricted selection of materials for construction. However, the slotted OD design is not practical for all applications with the majority using theinternal milled tangs 12 withslots 14 in theseal case 16. There is spring load variation due to operating range and the spring load decreases as theseal ring 20 wears compromising re-seating. Awave spring 22 resides between theseal case 16 and the cup to spring-bias them apart. Also, the natural frequency ofwave spring 22 is unknown and could cause loading issues under shock and vibration conditions. Moreover, the rotary mating surface which bears against theseal ring 20mating surface 20 a is not always part of the seal design, namely, the bearing inner race face, integral with the shaft (not shown) and the mating ring (not shown) obtained from multiple suppliers. - These solutions are not enough. In view of the foregoing, there is a demand for a rotary face seal that combines the best features of a magnet rotary seal with a non-magnetic seal to avoid the shortcomings associated with prior art rotary face seals.
- The present invention preserves the advantages of prior art rotary face seals. In addition, it provides new advantages not found in currently available rotary face seals and overcomes many disadvantages of such currently available rotary face seals.
- The invention is generally directed to the novel and unique rotary face seal that has magnetic repelling loading. The rotary face seal with magnetic loading of the present invention replaces a conventional mechanical spring mechanism with opposing/repelling magnets where the magnetic technology provides a spring-like biasing effect to provide a consistent load with minimal variation, which is not affected by natural frequency and material fatigue due to cyclic loading. This improves seal performance and service life by eliminating the issues that compromise the effectiveness of the spring mechanism. The magnetic technology replaces the mechanical spring mechanism preferably within a stationary cartridge with a “pusher” type magnetic assembly design. As a result, such a stationary cartridge of the present invention is an exact exchange or “drop-in” solution to replace known seal that use mechanical wave springs.
- It is therefore an object of the present invention to provide improved rotary face seal that overcomes the shortcomings associated with the prior art and provides vastly improved performance compared to such prior art designs.
- The novel features which are characteristic of the present invention are set forth in the appended claims. However, the invention's preferred embodiments, together with further objects and attendant advantages, will be best understood by reference to the following detailed description taken in connection with the accompanying drawings in which:
-
FIG. 1 is a cross-sectional view of a first known prior art rotary seal construction that uses conventional wave springs; -
FIG. 2 is a cross-sectional view of a second known prior art rotary seal construction that uses conventional wave springs; -
FIG. 3 is a cross-sectional view of a first embodiment of the invention; -
FIG. 4 is a cross-sectional view of a second embodiment of the invention with hydrodynamic lift-off grooves in the seal face of the rotating mating ring; and -
FIG. 5 is an end view of the seal face of the rotating mating ring showing the hydrodynamic lift-off grooves. - The
rotary face seal 100 of the present invention with magnet repelling loading replaces the mechanical spring mechanism with magnetic technology to provide a consistent load with minimal variation, which is not affected by natural frequency and material fatigue due to cyclic loading. This will improve seal performance and service life by eliminating the issues that compromise the effectiveness of the spring mechanism. The present invention, with its magnetic “spring” technology, replaces the mechanical spring mechanism of the prior art ofFIGS. 1 and 2 with the stationary cartridge of the present invention with a pusher type magnetic assembly design that results with the stationary cartridges being an exact exchange. - Referring to
FIG. 3 , of therotary face seal 100 of the present invention is shown to include a basic cartridge rotary face seal that is comprised of acup 102,seal case 104 with insertedseal ring 106 that fits into thecup 102 with an anti-rotation feature that includes aretaining ring 108 that resides in agroove 110 in thecup 102. Thecup 102, in turn, resides in a stationary housing 120 to complete the drop-in cartridge configuration. This anti-rotation structure prevents theseal case 104 from rotation when theseal ring 106 contacts a rotating mating face of a rotatingmating ring 112 that is rotates withshaft 114 due to being held in place by O-ring 116 inseat 112 c. Such rotation is prevented as well relative to theshaft end face 114 a or integral flange face, bearing inner face (not shown). - Any type of configuration may be used for attaching the rotating
mating ring 112 to theshaft 114, such as the use of O-rings, as shown. In addition, there may be a positive drive with an internal O-ring as secondary seal engagement the shaft with either radial of axial tangs that engage slots in the shaft. Or, there may be the reverse engagement with slots in the mating ring engaging tangs on the shaft. Also, there may be a positive drive with an internal O-ring as secondary seal engagement with the shaft with either radial of axial pins that engage the shaft. Further, there may be a reverse engagement with pins in the shaft engaging with the mating ring. Further, there may be a positive drive with an internal O-ring as secondary seal by using an axial clamping sleeve or a positive drive without an internal O-ring as secondary seal by using an axial clamping sleeve. - Also, an internal O-
ring 118 resides in thecup 102 which interfaces with theseal case 104 to provide a secondary seal while allowing axial movement of theseal case 104 within thecup 102 along theshaft axis 114 b. Theseal case 104 is preferably a metal alloy, as is well-known in the art. Known 0-ring designs and materials may be used, which are known in the art for the purposes indicated herein. For example, various elastomers may be used, which may or may not be pre-swollen. Aninternal retaining ring 108 in thecup 102 that prevents theseal case 104 from becoming disengaged from thecup 102. - Preferably, a pair of
magnets cup 102 and theseal case 104. The pair of magnets are a magnetic pusher assembly that is in thecup 102 and contacts theadjacent flange 104 a of theseal case 104 when theseal ring 106 is mated to themating face 112 a of therotating mating ring 112 while carrying out operation of the seal with a range of motion indicated as B inFIG. 3 . Themagnets magnets 120 a and 120 are each preferably of a unitary annular shape to reside within the annular-shaped cavity defined between thecup 102 and sealcase 104 discussed herein. In the alternative, the opposing/repelling magnets may each be made of a number of separate magnet members to suit the application at hand to provide the designed magnetic field and circuit. The repelling magnet force may also be a drop-in repelling magnetic cartridge-like solution offered by the Polymagnet company under the mark POLYMAGNET, for example as an alternative, which can maintain theseal case 104 in thecup 102 thereby eliminating the internal retaining ring and provide the mechanical load in the spring when theseal case 104 is mated against therotary mating face 112 a during operation. Further, the force, travel and the repelling profile of the magnets may be further modified to suit the application at hand. Theseal ring 106 may be any material suitable for the application at hand, such as carbon graphite, and the like. Themagnets 120 a and 120 provide an outwardly directed spring-biasing, as shown by arrows A inFIG. 3 . - Therefore, the rotary face seal of the present invention eliminates the risks associated with prior art designs.
- Turning now to
FIGS. 4 and 5 , analternative embodiment 200 of thefirst embodiment 100 of the present invention ofFIG. 3 is shown. Thealternative embodiment 200 is similar to the first embodiment except that therotating mating ring 212 has abearing surface 212 a which incorporates lift-off technology usinghydrodynamic grooves 250, as can be best seen inFIG. 5 , which is an end view of the bearing face 212 a of therotating mating ring 212. It should be noted that the configuration of thegrooves 250 is shown by way of example, and it should be understood that any type, configuration and array ofgrooves 250 may be used in connection with thealternative embodiment 200 to provide the benefits of such hydrodynamic lift-off grooves. - The
alternative embodiment 200 has all of the same other components as the first embodiment, such as acup 202,seal case 204, withseal ring 206 that is pushed outwardly bymagnets seal ring 206 bears against therotating mating ring 212. Theentire seal assembly 200 receives ashaft 214 to be sealed. - It would be appreciated by those skilled in the art that various changes and modifications can be made to the illustrated embodiments without departing from the spirit of the present invention. All such modifications and changes are intended to be covered by the appended claims.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US15/649,206 US20180017166A1 (en) | 2016-07-14 | 2017-07-13 | Rotary face seal with magnetic repelling loading |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US201662362348P | 2016-07-14 | 2016-07-14 | |
US15/649,206 US20180017166A1 (en) | 2016-07-14 | 2017-07-13 | Rotary face seal with magnetic repelling loading |
Publications (1)
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US20180017166A1 true US20180017166A1 (en) | 2018-01-18 |
Family
ID=60940845
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US15/649,206 Abandoned US20180017166A1 (en) | 2016-07-14 | 2017-07-13 | Rotary face seal with magnetic repelling loading |
US15/649,246 Active 2038-07-22 US11441685B2 (en) | 2016-07-14 | 2017-07-13 | Rotary face seal with magnetic puller loading |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US15/649,246 Active 2038-07-22 US11441685B2 (en) | 2016-07-14 | 2017-07-13 | Rotary face seal with magnetic puller loading |
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US (2) | US20180017166A1 (en) |
EP (1) | EP3469240B1 (en) |
PL (1) | PL3469240T3 (en) |
WO (2) | WO2018013833A1 (en) |
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US11473506B2 (en) * | 2020-11-18 | 2022-10-18 | Rolls -Royce North American Technologies Inc. | Electromagnetic carbon seal system |
DE102022108183A1 (en) | 2022-04-05 | 2023-10-05 | Frideco Ag | Mechanical sealing device, mechanical seal and method for assembling a mechanical sealing device |
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US10337618B2 (en) * | 2017-04-07 | 2019-07-02 | Gm Global Technology Operations Llc. | Seal assembly for a steering gear input shaft |
US20190195078A1 (en) * | 2017-12-21 | 2019-06-27 | Pratt & Whitney Canada Corp. | Contacting face seal |
CN108506495A (en) * | 2018-05-30 | 2018-09-07 | 北京化工大学 | Sealing ring, seal assembly and mechanical equipment |
IT201800010264A1 (en) * | 2018-11-12 | 2020-05-12 | Microtem Srl | Mechanical seal device, in particular for transmission shafts in ships, boats or the like |
CN109630685B (en) * | 2018-11-13 | 2020-10-27 | 扬州弘跃机械有限公司 | Double-end-face mechanical seal for axial flow pump |
CN110031210B (en) * | 2019-04-16 | 2021-01-05 | 青岛小海智能科技有限公司 | Fatigue performance testing device for track sealing ring and using method |
CN111396559B (en) * | 2020-03-27 | 2022-08-23 | 广州市昕恒泵业制造有限公司 | Single-row magnetic mechanical seal |
Citations (8)
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US3109660A (en) * | 1960-10-17 | 1963-11-05 | Gits Bros Mfg Co | Seal assembly |
US3161414A (en) * | 1961-05-10 | 1964-12-15 | Flexibox Ltd | Mechanical seals for use with relatively rotating members |
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2017
- 2017-07-13 US US15/649,206 patent/US20180017166A1/en not_active Abandoned
- 2017-07-13 PL PL17828477.4T patent/PL3469240T3/en unknown
- 2017-07-13 WO PCT/US2017/041969 patent/WO2018013833A1/en unknown
- 2017-07-13 EP EP17828477.4A patent/EP3469240B1/en active Active
- 2017-07-13 US US15/649,246 patent/US11441685B2/en active Active
- 2017-07-13 WO PCT/US2017/041962 patent/WO2018013827A1/en active Application Filing
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US4625977A (en) * | 1985-04-30 | 1986-12-02 | A. W. Chesterton Company | Convertible, stand-by rotary seal assembly |
US5161804A (en) * | 1991-07-09 | 1992-11-10 | Inpro Companies, Inc. | Magnetic seal |
US20060244221A1 (en) * | 2005-04-29 | 2006-11-02 | Villeneuve Michel L | Hydrodynamic magnetic seal |
US20070194536A1 (en) * | 2005-10-31 | 2007-08-23 | Petroleo Brasileiro S.A. - Petrobras | Airtight magnetic seal for bearing casings |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11473506B2 (en) * | 2020-11-18 | 2022-10-18 | Rolls -Royce North American Technologies Inc. | Electromagnetic carbon seal system |
DE102022108183A1 (en) | 2022-04-05 | 2023-10-05 | Frideco Ag | Mechanical sealing device, mechanical seal and method for assembling a mechanical sealing device |
WO2023194182A1 (en) * | 2022-04-05 | 2023-10-12 | Frideco Ag | End face mechanical sealing device, end face mechanical seal, and method for mounting an end face mechanical sealing device |
Also Published As
Publication number | Publication date |
---|---|
EP3469240A1 (en) | 2019-04-17 |
EP3469240A4 (en) | 2020-02-26 |
EP3469240B1 (en) | 2022-11-16 |
PL3469240T3 (en) | 2023-04-11 |
US20180017167A1 (en) | 2018-01-18 |
WO2018013833A1 (en) | 2018-01-18 |
WO2018013827A1 (en) | 2018-01-18 |
US11441685B2 (en) | 2022-09-13 |
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