WO2002002972A2 - Procede et ensemble pour limiter les fuites dans des joints mecaniques - Google Patents

Procede et ensemble pour limiter les fuites dans des joints mecaniques Download PDF

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Publication number
WO2002002972A2
WO2002002972A2 PCT/US2001/020506 US0120506W WO0202972A2 WO 2002002972 A2 WO2002002972 A2 WO 2002002972A2 US 0120506 W US0120506 W US 0120506W WO 0202972 A2 WO0202972 A2 WO 0202972A2
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WO
WIPO (PCT)
Prior art keywords
seal
spht
blocking agent
component
gasket
Prior art date
Application number
PCT/US2001/020506
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English (en)
Other versions
WO2002002972A3 (fr
Inventor
Carl C. Bjornson
Original Assignee
Northeast Equipment, Inc. Doing Business As Delta Mechanical Seals
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Northeast Equipment, Inc. Doing Business As Delta Mechanical Seals filed Critical Northeast Equipment, Inc. Doing Business As Delta Mechanical Seals
Priority to AU2001270214A priority Critical patent/AU2001270214A1/en
Publication of WO2002002972A2 publication Critical patent/WO2002002972A2/fr
Publication of WO2002002972A3 publication Critical patent/WO2002002972A3/fr

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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
    • F16J15/3464—Mounting of the seal
    • F16J15/3488—Split-rings

Definitions

  • TITLE METHOD AND KIT FOR REDUCING LEAKAGE IN
  • ATTORNEY/AGENT MACPHAEL HI, Donald T.
  • the present invention relates generally to reducing leakage in a mechanical seal.
  • this patent discloses and protects a method and kit for reducing leakage in mechanical seals wherein a blocking agent may be introduced, the seal ring may be attached to a gasket, the seal ring may be integrally formed with the gasket, and/or the seal may be provided with an access window to allow adjustment of the seal ring, seal ring joint, gasket, and/or seal ring-gasket mating surface without removing the seal from the shaft.
  • Mechanical seals and more specifically, mechanical split seals are employed in a wide variety of equipment, such as in pumps, to seal process fluid from flowing between a relatively high-pressure chamber or compartment on one side of the seal, and another relatively low-pressure chamber or compartment on the other side of the seal.
  • the process side containing the process fluid may be at a higher pressure than the atmospheric side, which may be at any pressure including a lower pressure than the process side.
  • the process side may be at a lower pressure than the atmospheric side, and may even be a vacuum.
  • Mechanical split seals are offered in many varieties, such as unitized, cartridge- mounted on a sleeve, semi-cartridge split, or component-split.
  • a mechanical split seal such as any of the type maintained above, may be mounted about a rotating shaft.
  • mechanical split seals generally comprise face-type mechanical seals, which have a pair of seal faces that are concentrically mounted about the shaft. The seal faces, each of which has a smooth radial primary sealing surface, are biased in contact with one another.
  • Some mechanical split seals may comprise two or more sets of seal faces and may also employ o- rings.
  • mechanical split seals are fully split in the radial direction, and are composed of two substantially semicircular halves, which may be brought together around the shaft to form a split surface. This construction enables a seal to be installed radially from the sides of the shaft.
  • Conventional non-split mechanical seals are slipped longitudinally over one end of the shaft, which may be costly, difficult, time-consuming or sometimes impossible to attach, especially if the shaft is long, heavy, or attached to equipment. The mating points where the split surfaces of two seal face segments meet are potential leakage paths.
  • o-rings also may be employed in a mechanical split seal.
  • the o- rings may be cut in either one location, creating a split o-ring with one joint, or in two locations, creating two o-ring portions, the ends of which meet at two joints, each construction allowing the o-ring to be positioned about the shaft without requiring the o-ring to be slipped longitudinally over the end of the shaft.
  • These o-ring joints are also potential leakage paths.
  • Reducing or eliminating leakage in mechamcal split seals may increase the availability of mechanical split seals to various applications previously thought improper, and thus may reduce the costly, difficult, and time consuming disassembly of equipment when installing or repairing a conventional non-split mechanical seal.
  • Leakage in a mechanical split seal may be reduced by bringing a fluid into contact with the mechanical split seal, introducing at least one blocking agent into the fluid, and pressurizing the fluid.
  • a shaft may be sealed by providing a mechanical split seal having a high pressure side and a low pressure side, installing the mechanical split seal on the shaft, bringing a fluid into contact with the high pressure side of the mechanical split seal, introducing a blocking agent into the fluid, and pressurizing the fluid.
  • a mechanical seal assembly may comprise a mechanical seal and a tablet comprising a blocking agent, wherein the tablet is disposed y ⁇ thin the mechanical seal.
  • a kit for sealing a shaft may include at least one split seal component having at least two substantially semicircular seal face halves adapted to be joined together about the shaft.
  • the spht seal face halves define a boundary between a low pressure side and a high pressure side.
  • a blocking agent suitable for introduction into the high pressure side is also provided.
  • An installed mechanical seal having a reduced leakage path may be prepared by a process comprising bringing a fluid into contact with the mechanical seal, introducing a blocking agent into the fluid, and pressurizing the fluid.
  • a split seal component comprising a first component, having at least one mating surface, is adapted to be disposed around a shaft.
  • a second component is adapted to be disposed around the shaft and also to be joined to the first component at the at least one mating surface.
  • At least one seal ring has at least one split and is adapted to be mounted about the shaft.
  • a gasket is disposed within the at least one mating surface and is adapted to engage with at least one seal ring to limit fluid leakage between the gasket and the seal ring. At least one seal ring is attached to the gasket.
  • a method for reducing leakage through a mechanical split seal comprising providing a mechanical split seal having two gland halves suitable for holding a circular seal face and providing a suitably shaped access port in at least on gland half.
  • the method also comprises accessing at least one of a gasket and a seal ring through the access port and adjusting the sealing position of at least one of a gasket and a seal ring through the access port.
  • a seal face component comprising two gland halves suitable for holding a circular seal face and at least one split seal ring mounted within the gland halves. At least one gland half includes an access port between a non-process side of the seal face component and the seal ring.
  • a split seal component comprising a first component adapted to be disposed around a shaft and having at least one mating surface.
  • a second component is adapted to be disposed around the shaft and to be joined to the first component at the at least one mating surface.
  • At least one seal ring having at least one split is adapted to be mounted about the shaft.
  • a gasket is disposed within the at least one mating surface and is adapted to engage with at least one seal ring.
  • the component also comprises means for attaching at least one seal ring to the gasket to form a leak tight interface between the split seal ring and the gasket.
  • a seal face component comprising two gland halves suitable for holding a circular seal face and at least one split seal ring mounted within the gland halves. At least one gland half includes means for accessing at least one seal ring without removing the gland half.
  • a seal face component comprising two gland halves suitable for holding a circular seal face component comprising two gland halves having at least one mating surface and being suitable for holding a circular seal face. At least one split seal ring is mounted within the gland halves. A gasket is disposed within the at least one mating surface, and at least one gland half includes means for accessing the gasket without removing the gland half.
  • FIG. 1 is a cross-sectional view of a mechanical split seal assembly mounted to a shaft
  • FIG. 2 is a plan view of a split rotary component comprising a split annular rotary seal face
  • FIG. 3 is an enlarged view of the rotary component of the mechanical split seal assembly depicted in FIG. 1, after a blocking agent has been introduced;
  • FIG. 4 is a diagrammatic view of a kit having a spht seal and a blocking agent
  • FIG. 5 is a cross-sectional view of a double mechamcal split seal assembly mounted to a shaft
  • FIG. 6A is a cross-sectional view of one embodiment of a channel gasket and seal rings as depicted in FIG. 5;
  • FIG. 6B is a cross-sectional view of one embodiment of a channel gasket and seal ring of the mechamcal spht seal assembly depicted in FIG. 1;
  • FIGS. 7A-C are side views of embodiments of a channel gasket and seal ring of a mechanical split seal assembly;
  • FIG. 8 A is a plan view of a split stationary component comprising an access window
  • FIG. 8B is a cross-sectional view of a mechanical spht seal assembly mounted to a shaft comprising an access window
  • FIG. 9 is a cross-sectional view of a mechamcal spht seal assembly mounted to a shaft.
  • the various embodiments of devices and methods described herein may be used to reduce leakage in any known or later-developed mechanical seal, and more specifically mechanical spht seals, including but not limited to the unitized, cartridge-mounted, semi- cartridge split, or component spht seals, as well as mechanical spht seals disclosed in United States Patent Nos. 5,961,122; 5,913,521; 5,716,054; 5,662,340; 5,571,268; 5,354,070; 4,576,384; and U.S. Patent application titled Mechanical Split Seal filed June 15, 2000 under Attorney Docket No. N0362/7007, which are hereby incorporated by reference.
  • Various embodiments as shown and described herein also may be used to reduce leakage in mechanical spht seals with one set of seal faces, or in mechanical spht seals with two or more sets of seal faces.
  • FIG. 1 is a cross-sectional view of a mechanical spht seal assembly 10, comprising a face-type mechanical spht seal 12, mounted about a shaft 14.
  • the compartment on a first side 16 of the face-type mechanical split seal 12 may typically include a process fluid, and the compartment on a second side 18 of the seal 12 may be dry, open to the environment, or otherwise maintained at a variety of pressures greater than or less than the first side 16 with the process fluid.
  • a motor or other piece of equipment may often be situated on second side 18 of the seal 12 and may be coupled to the shaft 14.
  • process fluid on first side 16 may be under pressure, the process fluid fills annular cavity 20 on first side 16 and may tend to leak through mechanical split seal 12 to annular channel 22 on second side 18, unless mechanical spht seal 12 provides a sufficiently strong, tight seal to prevent such leakage.
  • mechanical spht seal 12 provides a sufficiently strong, tight seal to prevent such leakage.
  • Mechanical spht seal assembly 10 typically comprises a rotary component 24, which rotates with the shaft 14 and a stationary component 26 which does not rotate with the shaft 14.
  • Rotary component 24 may be anchored to shaft 14 with a set screw (not shown), by a friction fit, or by any other appropriate method.
  • Stationary component 26 may be anchored to supporting structure 28 by bolts 30, or by any other appropriate method.
  • Gland seal 74 which may comprise rubber or any other elastomeric or other appropriate material, may provide a seal between the surface of the supporting structure 28 and the gland half 36, preventing process fluid leakage to the atmosphere.
  • Rotary component 24 and stationary component 26 are typically made of stainless steel and may be manufactured using conventional CNC manufacturing methods.
  • rotary component 24 and stationary component 26 may be made of any appropriate material, such as aluminum, brass, or plastic, and may be manufactured using any appropriate method, such as casting, rriachining, or molding.
  • Both rotary component 24 and stationary component 26 are fully spht in the radial direction, along a plane which passes through the center of shaft 14, such as the plane of the cross-sectional view of FIG. 1.
  • Rotary component 24 comprises two substantially semicircular rotary component halves 32, shown in FIG. 2.
  • Stationary component 26 includes two substantially semicircular stationary component halves 37, shown in FIG. 8 A.
  • Rotary component half 32 may be sized and adapted to receive a substantially semicircular rotary seal face segment 34, as shown in FIG. 2.
  • the stationary component half comprises a substantially semicircular gland half 36 which may be sized and adapted to receive a substantially semicircular stationary seal face segment 38.
  • gland half 36 and stationary seal face segment 38 is depicted in FIG. 1.
  • Rotary seal face segment 34 has a radial primary sealing surface 40
  • stationary seal face segment 38 has a radial primary sealing surface 42.
  • both sealing surfaces 40, 42 may be smooth.
  • the two rotary seal face segments 34 form an annular rotary seal face 44, as depicted in FIG. 2.
  • the two rotary seal face segments 34 are formed from annular rotary seal face 44 in the first instance by cracking annular rotary seal face 44 along rotary face spht 46.
  • the spht surfaces 48 depicted in FIGS. 1 and 3, may be relatively coarse, so that the two rotary seal face segments 34 fit together and interlock in mating fashion.
  • the spht surfaces 48 may be smooth, and may be machined or otherwise formed in any appropriate manner.
  • the two stationary seal face segments 38 likewise form an annular stationary seal face 50.
  • the stationary seal face segments 38 are formed from annular stationary seal face 50 in the first instance by cracking annular stationary seal face 50.
  • the spht surfaces 52 depicted in FIGS. 1 and 3, may be relatively coarse, so that the two stationary seal face segments 38 fit together and interlock in mating fashion.
  • the spht surfaces 52 may be smooth, and may be machined or otherwise formed in any appropriate manner.
  • Seal faces 44 and 50 may be constructed of, for example, graphite-filled silicon carbide, silicon carbide or ceramic, or carbon in annular form, and are normally manufactured to tight tolerances. The tolerances may vary depending on the apphcation.
  • face-type mechanical spht seal 12 comprises the mating of rotary seal face 44 with stationary seal face 50.
  • Rotary seal face 44 and stationary seal face 50 are biased together, for example by mechanical springs such as coil springs 54 disposed between gland half 36 and stationary seal face 50, to prevent process fluid from annular cavity 20 on first side 16 of seal 12 from leaking through to annular channel 22 on second side 18 of seal 12.
  • mechanical springs such as coil springs 54 disposed between gland half 36 and stationary seal face 50
  • Other suitable biasing techniques may be employed, such as the use of one or more elastomers or leaf springs.
  • coil springs 54 may be disposed between rotary component 24 and rotary seal face 44, or another suitable biasing technique may be employed such as the interposition of one or more elastomers or leaf springs between rotary component 24 and rotary seal face 44. Because seal faces 44 and 50 are generally manufactured to tight tolerances and biased against one another, pressurized fluid usually does not leak between them. However, in a spht mechanical seal such as spht mechanical seal 12, pressurized fluid may still leak between the two mating points of spht surfaces 48 or the two mating points of spht surfaces 52.
  • Spht seal ring 56 may form a seal between the rotary component 24 and the shaft 14.
  • Spht seal ring 56 comprises two seal ring portions, one of which is shown in FIG. 1.
  • spht seal ring 56 may comprise one joint, if it is cut in one location.
  • the joints at which the ends of the two seal ring portions meet, or the joint of a spht seal ring 56 having a single spht, are potential leakage paths through which pressurized fluid may leak from first side 16 of mechanical spht seal 12 to second side 18 of mechanical spht seal 12.
  • two spht seal rings 76, 78 may be used instead of the single spht seal ring 56 as shown in FIG. 9.
  • Spht seal ring 76 seals between the shaft 14 and the rotary component halves 32 and spht seal ring 78 seals between the outer axial wall 86 of the rotary seal face segment 34 and the rotary component halves 32.
  • a gasket 88 is positioned to form a seal between the spht seal rings 76, 78.
  • Spht seal ring 58 may be positioned between an outer axial wall 60 of the annular stationary seal face 50 and the stationary component half.
  • Spht seal ring 58 comprises two seal ring portions, one of which is shown in FIG. 1.
  • spht seal ring 56 may comprise one joint, if it is cut in one location.
  • the joints at which the ends of the two substantially semicircular seal ring portions meet, or the joint of a seal ring 56 having a single spht, are potential leakage paths through which pressurized fluid may leak from first side 16 of mechanical spht seal 12 to second side 18 of mechanical spht seal 12.
  • spht seal rings 56, 76 and/or 78 may be butt cut to provide a flat joint surface 60, 61.
  • the joints 60, 61 of seal rings 56, 58, 76, 78 may be shaped and formed to provide an interlocking joint including, but not limited to, a bah and socket joint or a tongue and groove joint.
  • spht seal rings 56, 58, 76, 78 may be slightly larger than the diameter of their respective sealing surfaces to provide a tight seal and joint.
  • Spht seal rings 56, 58, 76, 78 are shown with a circular cross-section, but any or all may have any suitable shape including, but not limited to, circular-shaped, oval- shaped, square-shaped, rectangular-shaped, X-shaped, and T-shaped.
  • mechanical spht seal 12 has two spht seal rings 56 and 58, other conventional mechanical spht seals may include as many as 7 or more of these seal rings.
  • such mechanical spht seals may include 14 or more joints between seal ring portions, and four or more mating points between spht surfaces such as spht surfaces 48 and 52.
  • the ends of the spht seal rings may be slightly displaced angularly from the rotary face sphts 46. This shght offset prevents seal face joints and seal ring joints from being aligned with one another which may reduce leakage and may prevent the seal ring from being caught between the mating surfaces of the rotary seal face segments and the rotary component halves.
  • Spht seal ring 56 also resists rotation of the rotary component 24 relative to the shaft 14, and helps to position the rotary component 24 concentrically about the shaft 14.
  • One or more set screws may also be used to attach rotary component 24 to shaft 14.
  • Other suitable methods attaching the rotary component may be employed.
  • Channel 70 may include a channel gasket 72, made of rubber or another appropriate elastomeric substance, in order to provide a seal between the two gland halves of the mechanical spht seal 12, preventing fluid leakage to the atmosphere.
  • the contact point between channel gasket 72 and the outside diameter of seal ring 58, shown in FIG. 3, may also comprise a leakage path.
  • a blocking agent may be introduced into a fluid contacting a mechanical spht seal, thereby reducing leakage through the seal.
  • the blocking agent migrates through the seal and lodges inside leakage paths such as the mating points of the spht surfaces of the seal face segments, and the joints of the seal rings, reducing fluid leakage therethrough.
  • the blocking agent may comprise any suitable material in any suitable form.
  • Leakage may be reduced or eliminated by introducing a blocking agent 62 to seal leakage paths in mechamcal spht seal 12.
  • the blocking agent 62 may be introduced in any appropriate manner.
  • the blocking agent 62 may be introduced into a process fluid on first side 16 of mechanical spht seal 12, for instance through one or both of bore holes 64, or the blocking agent 62 may be introduced on second side 18.
  • FIG. 3 depicts, for instance, a blocking agent 62 migrating through a bore hole 64 into annular cavity 20, and plugging leakage paths by forming deposits 66.
  • blocking agent 62 may be introduced in a process fluid on second side 18 of mechamcal spht seal 12. If first side 16 is placed under vacuum, or some pressure lower than the pressure on second side 18, blocking agent 62 may migrate to and plug leakage paths in mechamcal spht seal 12.
  • mechamcal spht seals may be double mechanical spht seals, having two sets of seal faces.
  • blocking agent 62 may be introduced into a pressurized process fluid between the two sets of seal faces or other seal leakage paths as noted above through bore hole 64A, 64B, and/or 64C. Blocking agent 62 may migrate to and plug leakage paths in both sets of seal faces.
  • Blocking agent 62 may be provided in pellet, pill, capsule or other suitable tablet form, such as tablet 68, as depicted in FIG. 3.
  • Tablet 68 includes an appropriate blocking agent 62 and may include an appropriate binder material enabling it to retain its shape. However, this binder material is preferably soluble so that tablet 68 readily dissolves when it makes contact with the fluid. Alternatively, tablet 68 may include an appropriate blocking agent 62 in compressed form, so that no binder is necessary.
  • Tablet 68 may include an adhesive to facilitate at least temporary attachment to an internal surface of mechanical spht seal 12, as shown in FIG. 3.
  • the volume of tablet 68 may be chosen in proportion to the volume of the internal cavity of mechanical spht seal 12, the number of seal faces and seal rings included in the mechanical spht seal 12, or other appropriate factors.
  • tablet 68 may be affixed to the bore of the gland half 36 in a manner so that it may be removed if not desired, or it may be affixed to an internal wall surface of the gland half 36. Tablet 68 may also be positioned in the large cavity area to avoid contact during start-up.
  • the blocking agent 62 may comprise, but is not limited to, any suitable material in any suitable form, such as liquid, slurry, powder, or tablet. Examples of such materials include, but are not limited to, sawdust, paper, cotton or other textiles, plastic or other polymer, metallic compounds, salts, calcium, silica or other sand materials, as well as any other suitable material. For certain FDA applications, compatible materials, such as Fibercon may be employed.
  • the blocking agent 62 may comprise fibrous or particulate material or a combination of fibrous material and particulate material.
  • the blocking agent 62 may comprise any other appropriate material or form, as the above examples are not intended to be limiting.
  • the optimal blocking agent may depend on many parameters of the particular apphcation, including the type of process fluid, the pressure of the process fluid, the pressure differential between first side 16 and second side 18 of mechanical spht seal 12, the materials of spht seal rings 56, 58, 76, and/or 78 the material of annular seal faces 44 and 50, and the coarseness or smoothness of spht surfaces 48 and 52.
  • Leakage through a mechanical spht seal 12 may be reduced or prevented by introducing an unpressurized process fluid into a first side 16 of mechanical spht seal 12, after which an appropriate blocking agent 62 may be introduced into the fluid.
  • the blocking agent 62 may already be present inside the mechanical spht seal 12 in tablet form, to be dissolved upon contact with the process fluid.
  • the fluid including the blocking agent 62 may be pressurized so that the blocking agent 62 may migrate to leakage paths such as the mating points between spht surfaces 48 and 52, and the joints between the seal ring portions of spht seal rings 56 and 58, forming deposits 66 to plug these leakage paths. This process may be repeated over the life of the seal if leakage begins or worsens, for instance because of erosion of various materials.
  • the blocking agent 62 may instead be introduced into the process fluid before introduction of the process fluid into first side 16 of mechanical spht seal 12.
  • the process fluid including the blocking agent 62 may be pre-prepared or even pre-packaged and may be customized for particular applications. After the process fluid including the blocking agent 62 is brought into contact with the mechanical spht seal 12, it may be pressurized so that the blocking agent may migrate to leakage paths, forming deposits 66 to plug these leakage paths. Again, this process may be repeated.
  • the process fluid may be introduced into first side 16 of mechanical spht seal 12 and pressurized, before the blocking agent is introduced.
  • the pressurized fluid including the blocking agent 62 may be introduced into the mechanical spht seal 12 for approximately 15 minutes, although a longer or shorter time may be employed, after which clean liquid not including a blocking agent may be flushed through the system, for instance by being pumped into one bore hole 64 and expelled through the same or another bore hole. If leakage persists, the blocking agent 62 or the pressurized process fluid including the blocking agent 62 may be reintroduced. Depending on the particular apphcation, the blocking agent 62 or the process fluid including the blocking agent 62 may be introduced for any appropriate amount of time. A number of different blocking agents 62 may be used, serially or in combination.
  • a relatively coarse blocking agent may be introduced first, after which successively finer blocking agents are introduced to occupy or plug progressively smaller crevices and leakage paths.
  • particulate material ground to increasingly fine particulate sizes.
  • sawdust or another fibrous material such as paper, ground to increasingly fine fiber lengths and diameters.
  • blocking agents of different types may be introduced in series to achieve maximum leakage reduction.
  • One example is a fibrous material, followed by a particulate material.
  • kits 90 for reducing or eliminating leakage may be provided, as shown in FIG. 4.
  • the kit 90 may include a mechanical spht seal 12, or at least one component of a mechanical seal 12 and a blocking agent 62 suitable for introduction into the seal.
  • the blocking agent 62 may comprise any suitable material in any suitable form as described above.
  • the blocking agent 62 is shown in powder form, which may be disposed within a container 100 having a cap 101.
  • additional or other suitable forms may be contained in kit 90 such as tablet 68, also shown.
  • an instruction guide 102 may be provided. The guide may include instructions relating to the procedure for using and/or introducing the blocking agent into the seal 12 as fully described above.
  • gasket 72 may be shaped and formed to mate with seal ring 58.
  • the gasket 72 may be shaped and formed to provide at least one groove 110 for mounting at least one seal ring 58.
  • the seal ring 58 is mounted within the groove 110, the gasket 72 contacts seal ring 58 over a larger surface area 111, which, in the embodiment shown, is an arcuate surface.
  • seal ring 58 may be shaped in formed in various shapes, and the groove 110 may be suitably shaped and formed to mate with the surface of seal ring 58.
  • the seal ring 58 may be attached to gasket 72.
  • Seal ring 58 may be attached to gasket 72 using an elastomeric adhesive that may set up and extrude onto the mating surface 111 between seal ring 58 and gasket 72.
  • the elastomeric adhesive may help ehrninate any leakage of the process fluid between seal ring 58 and channel gasket 72. Certain embodiments may also help maintain seal ring 58 in its proper sealing position against gasket 72.
  • the elastomeric adhesive may allow the mechanical spht seal assembly 10 to operate at a higher pressure and reduce the incidence of blow-by between seal ring 58 and channel gasket 72.
  • the elastomeric adhesive may be applied to the seal ring 58 or the channel gasket 72 surface during assembly of the mechanical spht seal 10, either at the factory, during manufacture, or when installing the parts around the shaft 14.
  • the elastomeric adhesive includes, but is not limited to, sihcone rubber.
  • the seal ring joint 60 may be seated proximate to channel gasket 72.
  • joint 60 of seal ring 58 may be aligned with an edge of channel gasket 72.
  • seal ring joint 60 may be placed in direct contact with channel gasket 72.
  • channel gasket 72 helps to surround joint 60 of seal ring 58 and help prevent leakage at the joint 60 of seal ring 58.
  • the joint 60 of seal ring 58 may be offset from the channel gasket 72.
  • seal ring 58 may be integrally formed with channel gasket 72, providing a one piece elastomer molded channel gasket and seal ring combination.
  • the seal ring 58 and channel gasket 72 may be integrally molded using suitable manufacturing techniques including injection molding.
  • spht seal ring 56, 58 may have a cross-section that is circular-shaped, oval-shaped, square-shaped, rectangular- shaped, X-shaped, T-shaped, or any suitable shape.
  • seal ring 58 and channel gasket 72 the invention is not limited in this respect, and the molded rubber surface, elastomeric adhesive, and/or integral molding of rubber parts may be used in association with any rubber-to-rubber joint in a mechanical seal including, but not limited to the rubber-to- rubber joints between seal rings 76, 78 and gasket 88 as shown in FIG. 9.
  • leakage in the mechanical spht seal may also be reduced by adjusting the sealing position of seal ring 56, seal ring 58, seal ring joints 60, 61, gasket 72, and/or seal ring gasket mating surface 111.
  • This may be accomplished by providing an access window 80 in gland half 36 to allow access to seal ring 56, seal ring 58, joints 60, 61, gasket 72, and/or seal ring gasket mating surface 111.
  • Such an embodiment may also allow adjustment within the mechamcal spht seal 10 without dismantling the mechamcal spht seal 10.
  • the access window may be provided on the second side 18 of the spht seal assembly 10.
  • a shim 82 may be inserted through window 80 to "nudge" seal ring 58 and/or the joint 60 of seal ring 58 into its proper sealing position with channel gasket 72.
  • access window 80 may be placed proximate the gland half spht joint 84.
  • access window 80 may then be used to adjust the sealing surface 111 between seal ring 58 and gasket 72, the gasket 72, and/or seal ring joint 60 of seal ring 58.
  • shim 82 may also be inserted into spht seal assembly 10 to adjust the seated position of seal ring 56.
  • shim 82 may be inserted through annular channel 22 and between rotary seal face segment 34 and the shaft 14 to "nudge" seal ring 56 and/or seal ring 56 joints 61 into the proper seated and sealing position between rotary seal face segment 34 and shaft 14.
  • an access window is shown and described with reference to a single mechanical spht seal, the invention is not limited in this respect and the access window may be provided in a double-mechanical spht seal as shown in FIG. 5.
  • the access window 80 may be provided in the gland half 36 to access gasket 72 and/or both seal rings 58a, 58b, or individual access windows may be provided to access gasket 72 and/or each seal ring 58a, 58b individuahy as shown in FIG. 5.
  • the placement, shape, and size of the access window 80 may be limited by the seal faces 38a, 38b, however, a single or multiple access windows may be provided to access gasket 72, seal rings 58a, 58b, the joints of seal rings 58a, 58b, and or the joints between seal rings 58a, 58b and gasket 72. Similar to the single seal design, access to seal rings 56a, 56b may be provided between the seal face segments 34a, 34b and the shaft 14. Although an access window is shown and described, the invention is not limited in this respect and other suitable mechanical spht seal configurations may be employed that allow the seal rings and/or gasket to be adjusted without dismantling the seal.
  • the invention is described above with reference to a mechamcal spht seal, the invention is not hrnited in this respect and any combination of the blocking agent, the seal ring attached to the gasket, the seal ring integrally formed with the gasket, and the access window in the gland may be used singly or in combination in a conventional non-spht seal to reduce leakage therethrough.

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  • Mechanical Sealing (AREA)

Abstract

Afin de limiter les fuites dans un joint mécanique, on peut introduire un agent de blocage, le joint peut être fixé à une garniture d'étanchéité, la bague de joint peut être formée d'une seule pièce avec la garniture d'étanchéité et/ou le joint peut être équipé d'une fenêtre d'accès permettant de régler la surface de contact de la bague de joint, du joint de bague d'étanchéité, de la garniture d'étanchéité et/ou de la bague de joint/garniture d'étanchéité sans devoir démonter le joint de l'arbre. L'agent de blocage peut être introduit dans un fluide entrant en contact avec un joint fendu mécanique, ou être présent dans le joint sous forme de pastille et être libéré par contact avec le fluide. L'agent de blocage migre dans le joint et se loge à l'intérieur de passages donnant lieu à des fuites, ou bouche ces passages, tels que les points d'assemblage des surfaces fendues de segments de surface de contact, et les joints de bagues et garnitures d'étanchéité, limitant ainsi davantage les fuites de fluide à travers ceux-ci.
PCT/US2001/020506 2000-06-29 2001-06-28 Procede et ensemble pour limiter les fuites dans des joints mecaniques WO2002002972A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001270214A AU2001270214A1 (en) 2000-06-29 2001-06-28 Method and kit for reducing leakage in mechanical seals

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US60658800A 2000-06-29 2000-06-29
US09/606,588 2000-06-29

Publications (2)

Publication Number Publication Date
WO2002002972A2 true WO2002002972A2 (fr) 2002-01-10
WO2002002972A3 WO2002002972A3 (fr) 2002-08-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/020506 WO2002002972A2 (fr) 2000-06-29 2001-06-28 Procede et ensemble pour limiter les fuites dans des joints mecaniques

Country Status (2)

Country Link
AU (1) AU2001270214A1 (fr)
WO (1) WO2002002972A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2013054610A1 (ja) * 2011-10-11 2015-03-30 イーグル工業株式会社 分割型メカニカルシール装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3627007A (en) 1968-11-22 1971-12-14 Alfred H Rieffer Ax
US4576384A (en) 1985-01-03 1986-03-18 A. W. Chesterton Company Split mechanical face seal
US5354070A (en) 1991-10-12 1994-10-11 Aes Engineering Limited Split mechanical seal
US5571268A (en) 1993-12-16 1996-11-05 A.W. Chesterton Company Universal split mechanical seal
US5662340A (en) 1996-04-08 1997-09-02 Flex A Seal, Inc. Fully split cartridge mechanical seal assembly
US5716054A (en) 1995-01-18 1998-02-10 Bw/Ip International, Inc. Diametric plane split mechanical face seal
US5913521A (en) 1997-08-29 1999-06-22 John Crane Sealol Inc. Rotating seal ring component kit for a mechanical split seal
US5961122A (en) 1995-07-21 1999-10-05 Flowserve Management Company Split mechanical face seal and method of assembly thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1323320A (fr) * 1961-05-23 1963-04-05 Borg Warner Dispositif d'étanchéité à joint mécanique fragmenté
US3433655A (en) * 1966-04-27 1969-03-18 Edison Muse Jr Sealer and method of sealing liquid systems
US4439561A (en) * 1982-03-24 1984-03-27 Union Carbide Corporation Sealant composition and method

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3627007A (en) 1968-11-22 1971-12-14 Alfred H Rieffer Ax
US4576384A (en) 1985-01-03 1986-03-18 A. W. Chesterton Company Split mechanical face seal
US4576384B1 (fr) 1985-01-03 1992-06-30 Henri V Azibert
US5354070A (en) 1991-10-12 1994-10-11 Aes Engineering Limited Split mechanical seal
US5571268A (en) 1993-12-16 1996-11-05 A.W. Chesterton Company Universal split mechanical seal
US5716054A (en) 1995-01-18 1998-02-10 Bw/Ip International, Inc. Diametric plane split mechanical face seal
US5961122A (en) 1995-07-21 1999-10-05 Flowserve Management Company Split mechanical face seal and method of assembly thereof
US5662340A (en) 1996-04-08 1997-09-02 Flex A Seal, Inc. Fully split cartridge mechanical seal assembly
US5913521A (en) 1997-08-29 1999-06-22 John Crane Sealol Inc. Rotating seal ring component kit for a mechanical split seal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2013054610A1 (ja) * 2011-10-11 2015-03-30 イーグル工業株式会社 分割型メカニカルシール装置

Also Published As

Publication number Publication date
WO2002002972A3 (fr) 2002-08-15
AU2001270214A1 (en) 2002-01-14

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