US20090189354A1 - Reciprocating-rod seal - Google Patents
Reciprocating-rod seal Download PDFInfo
- Publication number
- US20090189354A1 US20090189354A1 US12/241,674 US24167408A US2009189354A1 US 20090189354 A1 US20090189354 A1 US 20090189354A1 US 24167408 A US24167408 A US 24167408A US 2009189354 A1 US2009189354 A1 US 2009189354A1
- Authority
- US
- United States
- Prior art keywords
- rod
- seal
- airside
- reciprocating
- elastomeric body
- 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
Links
- 238000007789 sealing Methods 0.000 claims abstract description 21
- 239000012530 fluid Substances 0.000 claims abstract description 11
- 229920001971 elastomer Polymers 0.000 claims description 7
- 239000000806 elastomer Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 12
- 230000004323 axial length Effects 0.000 description 4
- 238000009966 trimming Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
- F04B53/143—Sealing provided on the piston
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1459—Coating annular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14065—Positioning or centering articles in the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14549—Coating rod-like, wire-like or belt-like articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1671—Making multilayered or multicoloured articles with an insert
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2616—Moulds having annular mould cavities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C45/44—Removing or ejecting moulded articles for undercut articles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
- F04B53/144—Adaptation of piston-rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
- F04B53/144—Adaptation of piston-rods
- F04B53/146—Piston-rod guiding arrangements
-
- 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
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/28—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction of non-metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
- B29C2045/14459—Coating a portion of the article, e.g. the edge of the article injecting seal elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C2045/1486—Details, accessories and auxiliary operations
- B29C2045/1495—Coating undercut inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2021/00—Use of unspecified rubbers as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2009/00—Layered products
- B29L2009/005—Layered products coated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/06—Rods, e.g. connecting rods, rails, stakes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints
- B29L2031/265—Packings, Gaskets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Devices (AREA)
Abstract
A reciprocating-rod seal (10) comprising a one-piece rigid support (20) and a one-piece elastomeric body (30) bonded to the rigid support (20). A notch (40) separates an ID fluidside portion (41) of the elastomeric body (30) from an OD fluidside portion (42) of the elastomeric body (30), and the ID fluidside portion (41) forms a sealing lip (43). A groove (50) separates an ID airside portion (51) of the elastomeric body (30) from an OD airside portion (52) of the elastomeric body (30), and the ID airside portion (51) forms a wiping lip (53). The sealing lip (43) prevents fluid escape during forward and return strokes of a reciprocating rod, and the wiping lip (53) removes dirt, dust, or other debris from the rod during return strokes. The seal (10) can serve as the primary seal for a mudpump pony rod and/or a mudpump plunger rod.
Description
- This application claims priority under 35 U.S.C. §119 (e) to U.S. Provisional Patent Application No. 61/023,452 filed on Jan. 25, 2008. The entire disclosure of this provisional application is hereby incorporated by reference.
- This disclosure relates to a seal for sealing the interface between a housing and a reciprocating rod extending therethrough.
- In an offshore drilling operation, a drillstring extends from the rig platform into a wellbore whereat its drillbit drills deeper and deeper into the sea floor. During drilling, pumps circulate mud through the drillbit and back through the riser surrounding the drillstring. Mudpumps are usually large positive displacement pumps which generate flow by reciprocal plunger movement. In a triplex mudpump, for example, three plungers can be reciprocally driven by pony rods to suction the working fluid (e.g., mud slurry) through an inlet and discharge it through an outlet. A typical triplex mudpump could have a horsepower rating from 275 to 2000 BHP and discharge pressures from 1000 psi to 7500 psi. In offshore drilling, as well as many other industrial situations, convenient accessibility of expendable parts, such as reciprocating-rod seals, can be of the utmost importance.
- A seal comprises a one-piece rigid support and a one-piece elastomeric body bonded to the rigid support. The rigid support encases the elastomeric body whereby it does not extend radially or axially beyond a retaining wall. The elastomeric body forms a sealing lip that prevents fluid escape during forward and return strokes of the reciprocating rod. The elastomeric body also forms a wiping lip, that removes dirt, dust and other debris from the rod during return strokes.
- In a mudpump, for example, the seal can be used to seal interfaces associated with pony rods or plunger rods. In such a mudpump application, the seal will be easily accessible for installation, inspection or replacement. Furthermore, in many mudpump situations, the seal can be the only sealing component necessary on the reciprocating rod. In other words, the seal can be the primary seal on a mudpump reciprocating rod assembly, without buffer rings and/or stronger seals within the housing.
- These and other features of the seal are fully described and particularly pointed out in the claims. The following description and annexed drawings set forth in detail certain illustrative embodiments, these embodiments being indicative of but a few of the various ways in which the principles may be employed.
-
FIG. 1 is a cross-sectional view of a reciprocating-rod seal in a pre-installation condition, the seal including a rigid support and an elastomeric body. -
FIG. 2 is a cross-sectional view of a reciprocating-rod seal when it further includes a reinforcement member. -
FIGS. 3A-3D are schematic views of a method of making the seal. -
FIG. 4 is a cross-sectional view of the seal installed in a reciprocating-rod assembly. -
FIG. 5 is a perspective view of a mudpump wherein the seal is used to seal an interface associated with a pony rod and/or a plunger rod. - A reciprocating-
rod seal 10 is shown inFIG. 1 in a pre-installation condition. Theseal 10 has an outer-radial surface 11, an inner-radial surface 12, afluidside surface 13, and anairside surface 14. The distance between theradial surfaces seal 10 and the distance between theside surfaces - The
seal 10 comprises arigid support 20 and anelastomeric body 30 bonded thereto. The support-body bond, and its ability to withstand heat, pressure, and repeated reciprocal motion, may factor heavily into the life and the performance of theseal 10. Thus materials and bonding techniques may be chosen to optimize the adherence between thesupport 20 and theelastomeric body 30. For example, therigid support 20 can be made of stainless steel, theelastomeric body 30 can be made of polyurethane, and bonding can be accomplished during injection molding. - The
rigid support 20 can be a one-piece member that is, for example, stamped or otherwise formed from a metal sheet. Therigid support 20 comprises a cylindricalretaining wall 22, aflange wall 24, and ananchor wall 25 which collectively form a J-like cross-sectional shape. Other cross-sectional shapes are possible and contemplated. For example, therigid support 20 could be constructed without theflange wall 24 and/or theanchor wall 25, and/or therigid support 20 could be constructed with additional walls, flanges or anchors. - The cylindrical
retaining wall 22 forms the seal's outer-radial surface 12 and, in the illustrated embodiment, theelastomeric body 30 does not extend axially or radially beyond thiswall 22. Theflange wall 24 extends radially inward from an airside end of thewall 22. Theanchor wall 25 extends axially in the fluidside direction from the inner-radial end of theflange wall 24. The wall-to-wall transitions (i.e., the corners) can be rounded, curved, sharp, blunt or another profile compatible with the expected sealing application and intended manufacturing method. - The span of the
flange wall 24 can be between 20% and 50% of the radial thickness of theseal 10, and the reach of theanchor wall 25 can be between 10% and 30% of the seal's axial length. Theflange wall 24 partially forms theairside surface 14 of theseal 10 and theanchor wall 25 is embedded within theelastomeric body 30. The walls' span/reach may depend, at least somewhat, upon the geometry of a groove (namely agroove 50, introduced below), in theelastomeric body 30. - The gauge of the
walls rigid support 20 can be relatively small compared to the overall radial thickness of theseal 10. For example, the wall gauge will usually be in the range of 1 mm to 5 mm and/or 5% to 20% the radial thickness of theseal 10. If thesupport 20 is stamped or otherwise formed from sheet material, the gauges of thewalls - The fluid-
side edge section 26 of the retaining wall 22 (e.g., 10% to 30% of the wall's axial length) can be thinner than the rest of the retaining wall. For example, theedge section 26 can be crimped or otherwise made thinner than the rest of thewall 22. This geometry may prove helpful, in that it can provide a predetermined bending area during support/seal insertion during installation and/or manufacture. The same could be accomplished by, for example, notching, perforating, or otherwise weakening the proximal region of theedge section 26 to form a living hinge. - The
elastomeric body 30 has an outer-radial face 31, an inner-radial face 32, afluidside face 33, and anairside face 34. The outer-radial face 31 is encased by the cylindricalretaining wall 22 whereby, as mentioned above, theelastomeric body 30 does not extend axially or radially beyond thiswall 22. The inner-radial face 32 forms the seal's inner-radial surface 12, and can include afluidside ramp 35, anairside ramp 36, and a shallow 37 therebetween. - The
fluidside face 33 forms the seal'sfluidside surface 13. Anotch 40 in the fluidside face 33 (and/or the seal's fluidside surface 13) separates theelastomeric body 30 into anID fluidside portion 41 and anOD fluidside portion 42. The ID fluidside portion forms asealing lip 43 and can include acutoff corner 44. - The
airside face 34 of theelastomeric body 30 can form theairside surface 14 of theseal 10 along with theflange wall 24 of therigid support 20. Agroove 50 in the airside face 34 (and/or the seal's airside surface 14) separates theelastomeric body 30 into anID airside portion 51 and anOD airside portion 52. TheID airside portion 51 forms awiping lip 53 and can include anacute corner 54. Theflange wall 24 of therigid support 20 encases part of the ODairside portion 52 and theanchor wall 25 is embedded therein. Thegroove 50 can also include arim 55 around its airside edge. - In the illustrated
seal 10, thenotch 40 has a cross-sectional shape resembling a rounded-vertex V. And thegroove 50 has a cross-sectional shape resembling a rimmed U. While such geometries will be suitable in many applications, the shape, size, and/or situating of thenotch 40 and/or thegroove 50 can be varied to best provide the desired sealing and wiping functions, to facilitate installation, and/or to simplify manufacture. - For example, the size, shape, and situating of the notch/groove can be selected to accommodate installation. As is explained in more detail below, the
seal 10 is radially compressed during installation, and this installation compression will usually be concentrated in theID portions elastomeric body 30. In many seal constructions, the thicker theID portions 42/52, the greater the compression required for seal installation. Thus, the notch/groove can be designed to insure that the required forces are reasonable for the intended seal application. - The size/shape/situating of the
notch 40 and thegroove 50 should also be selected to insure that thelips 43/53 can maintain constant sliding contact with the relevant reciprocating rod. In most instances, the sealinglip 43 should probably apply a greater rod-contact force than the wipinglip 53. Otherwise, the wipinglip 53 could block fluid film still on the reciprocating rod (e.g., fluid that snuck past the sealing lip 43) during forward strokes, resulting in fluid accumulation within the shallow 37, and eventual leakage therefrom. This desired rod-contact-force relationship can be accomplished by, for example, thegroove 50 being wider, deeper, and/or closer (to the OD face 32) than thenotch 40. - The size, shape, and/or situating of the
notch 40 and/or the groove may further take into consideration the integrity of the bond between therigid support 20 and theelastomeric body 30. For example, if an elastomer is expected to shrink after seal formation, this can cause theelastomeric OD portions 42/52 to pull away (i.e., radially inward) from therigid retaining wall 22. If so,thinner OD portions 42/52 may be preferred to lesson this pull and thereby preserve bond integrity. - With particular reference to the
groove 50, the design of therigid support 20 may play into its size, shape, and situating. Specifically, for example, if therigid support 20 has aflange wall 24, thegroove 50 will usually need to be spaced a sufficient distance radially outward therefrom. And if therigid support 20 has ananchor wall 25, thegroove 50 may be best positioned to allow adequate embedding (and thus anchoring) of thesupport 20 to theelastomeric body 30. - In most intended sealing situations, a
notch 40 and/or agroove 50 having a radial span (at its fluidside end) of 10% to 30% of the radial thickness of theseal 10, and a depth (in the axial direction) of about 20% to 40% of the seal's axial length, will be suitable. - As shown in
FIG. 2 , theseal 10 can (but need not) further comprise areinforcement member 60 lining itsairside groove 50. Thereinforcement member 60 can have a shape corresponding to the non-rimmed regions of thegroove 50, and therim 55 can be helpful in holdingreinforcement member 60 in place prior to installation. Themember 60 can comprise, for example, a folded metal sheet that functions as spring in theseal 10 and resiliently urges theairside portions - A method of making the
seal 10 with amold 70 is schematically shown inFIGS. 3A-3D . Themold 70 has acavity 71 formed bymold parts first mold part 72 has achannel 75 corresponding to the seal's airside face 14 (and at least some of its OD face 12) and groove-formingprojection 76. Thesecond mold part 73 has achannel 77 corresponding to the seal's fluidside face 13 (and possibly some of its OD face 12) and a notch-formingprojection 78. Thecore part 74 has a perimeter corresponding to the seal's ID face 11 (e.g., ramp-shallow-ramp). - The
rigid support 20 is inserted into thechannel 75 in the first mold part, with itsretaining wall 22 positioned against the channel cliff and itsflange wall 24 positioned against the channel floor. Once therigid support 20 is inserted, and thecore part 74 placed in position, thesecond mold part 73 is placed thereover to close thecavity 71. If the retainingwall 22 includes a hingedend section 26, it can occupy the upper edge region of thechannel 75, and facilitate insertion of therigid support 20 and/or insure a tight fit upon placement of thesecond mold part 73. - Once the
mold parts cavity 71. The introduced-elastomer pressure within thecavity 71 pushes the retainingwall 22 against the channel cliff and theflange wall 24 against the channel floor. Therigid retainer 20, and its positioning within themold cavity 71, can thereby prevent the elastomer from extending axially or radially beyond thecylindrical wall 22. - After the elastomer cures and/or hardens, the
mold 70 is opened and the molded piece is removed therefrom. In the illustrated embodiment, the molded piece has an OD fluidside geometry bulging beyond that of theseal 10 and it must be trimmed to form the sealinglip 43. If the molded piece has a geometry more closely mirroring that of theseal 10, such trimming may not be necessary. But one advantage of a method including a trimming step is that the ID parting line (between theupper mold part 73 and the core part 74) can be positioned above the sealing-lip location. In this manner, any ragged-flash seams caused by the parting line are removed during trimming and a smoothsharp sealing lip 43 is formed. - If the
seal 10 includes a retainingmember 60, it can be inserted into thegroove 50 after completion of the molding and trimming steps. - Referring now to
FIG. 4 , theseal 10 is shown as part of a reciprocating-rod assembly 80 comprising ahousing 81 and arod 82 that reciprocally moves relative to thehousing 81. Thehousing 81 comprises anopening 83 through which therod 82 extends and apocket 84 surrounding theopening 83. Thepocket 84 has afloor 85 and a ledge 86 extending radially inward from the floor's fluidside end. - When the
seal 10 is installed in thepocket 84, itscylindrical retaining wall 22 abuts against the pocket'sfloor 85. If the retainingwall 22 has a hingedend section 26, this may aid in press-fitting therigid support 20 into thepocket 84 during seal installation. The ledge 86 can preferably project beyond thewall end section 26 so that theOD fluidside portion 42 can lie flush thereagainst. - The radial distance between the
pocket floor 85 and therod 81 is less than the seal's thickness, and theID portions corners lips rod 81. More specifically, thefluidside ramp region 35 of theID face 31 forms a rod-contacting region of the sealinglip 43 and theairside ramp region 36 forms a rod-contacting region of the wipinglip 53. The shallow 37 between the ramp regions is not a rod-contacting region. As was explained above, it may be important in many instances that the sealinglip 43 apply a greater contract force against therod 81 than the wipinglip 53. - In operation of the
assembly 80, therod 82 moves in a reciprocal manner with forward strokes away from thehousing 81 and return strokes back towards thehousing 81. During forward and return strokes, the sealinglip 43 seals the housing-rod interface and prevents fluid from escaping from thehousing 81. During return strokes, the wipinglip 53 removes (e.g., wipes) dirt, dust, and other debris fromrod 82. - The reciprocating-
rod assembly 80 can be part of a pump, such as themudpump 90 shown inFIG. 5 . Themudpump 90 comprises a power-providingstation 91 and a pumpingstation 92 that work together to suction a working fluid (e.g., mud slurry) through aninlet 93 and discharges it through anoutlet 94. The power-providingstation 91 houses equipment (e.g., crank shaft, cross-heads, etc.) for reciprocal movement ofpony rods 95 that extend through appropriate openings in thefront panel 96 of the station's housing. The pumpingstation 92 houses a cylinder block for receipt of plungers, carried byplunger rods 97 extending through appropriate openings in arear panel 98 of the station housing. Thepony rods 95 and theplunger rods 97 interconnect between thestations plunger rods 93 are reciprocally driven by thepony rods 95. If themudpump 90 has a triplex design, for example, it could have threepony rods 95 and threeplunger rods 97. - The reciprocating
rod assembly 80, and thus theseal 10, can be used in conjunction with themudpump pony rods 95 and/or themudpump plunger rods 97. In either or any case, astation panel 96/97 is thehousing 81, arod 95/97 is the reciprocatingrod 82, and theseal 10 is positioned in apocket 84 around the rod-receiving opening in thehousing 81. With theseal 10 so positioned in themudpump 90, it is easily accessible for installation, inspection or replacement. Furthermore, it can serve as the only seal on therelevant rod 95/97 whereby buffer rings and/or supplemental seals within the housing are not necessary. In other words, theseal 10 can be the primary seal on the mudpump'sreciprocating rod assembly 80. - Although the
seal 10, therigid support 20, theelastomeric body 30, themold 70, theassembly 80, themudpump 90, and other related components, elements, methods, and steps, have been shown and described with respect to certain embodiments, it is obvious that equivalent alterations and modifications will occur to others skilled in the art upon the reading and understanding of this specification and the annexed drawings. In regard to the various functions performed by the above described elements (e.g., components, assemblies, systems, steps, devices, compositions, etc.), the terms (including a reference to a “means”) used to describe such elements are intended to correspond, unless otherwise indicated, to any element which performs the specified function of the described element (i.e., that is functionally equivalent), even though not structurally equivalent to the disclosed structure which performs the function. In addition, while a particular feature may have been described above with respect to only one or more of several illustrated embodiments, such feature may be combined with one or more other features of the other embodiments, as may be desired and advantageous for any given or particular application.
Claims (19)
1. A reciprocating-rod seal comprising a one-piece rigid support and a one-piece elastomeric body bonded thereto; wherein:
the rigid support comprises a cylindrical retaining wall forming an OD surface of the seal;
the elastomeric body comprises:
an OD face encased by the cylindrical retaining wall whereby the elastomeric body does not extend axially or radially beyond the retaining wall,
an ID face forming the ID surface of the seal,
a fluidside face forming the fluidside surface of the seal and having a notch formed therein, and
an airside face at least partially forming the airside surface of the seal and having a groove formed therein;
the notch separates an ID fluidside portion of the elastomeric body from an OD fluidside portion of the elastomeric body, and the ID fluidside portion forms a sealing lip; and
the groove separates an ID airside portion of the elastomeric body from an OD airside portion of the elastomeric body, and the ID airside portion forms a wiping lip.
2. A reciprocating-rod seal as set forth in claim 1 , wherein the rigid support also comprises a flange wall extending radially inward from an airside end of the cylindrical retaining wall.
3. A reciprocating-rod seal as set forth in claim 2 , wherein a region of the airside face of the elastomeric body is encased by the flange wall.
4. A reciprocating-rod seal as set forth in claim 2 , wherein the rigid support comprises an anchor wall extending axially from an ID end of the flange wall.
5. A reciprocating-rod seal as set forth in claim 4 , wherein at least a part of the OD airside portion of the elastomeric body occupies a space defined within the flange wall and the anchor wall of the rigid support.
6. A reciprocating-rod seal as set forth in claim 3 , wherein the flange wall of the rigid support and the airside face of the elastomeric body form the airside surface of the seal.
7. A reciprocating-rod seal as set forth in claim 1 , wherein the sealing lip applies more rod-contact forces than the wiping lip.
8. A reciprocating-rod seal as set forth in claim 1 , wherein the retaining wall has a hinged fluidside end section.
9. A reciprocating-rod seal as set forth in claim 1 , wherein the rigid support is made of metal.
10. A reciprocating-rod seal as set forth in claim 1 , wherein the elastomeric body is made from polyurethane.
11. A reciprocating-rod seal as set forth in claim 1 , further comprising a separate reinforcement member positioned within the groove in the airside face of the elastomeric body.
12. A reciprocating-rod seal as set forth in claim 1 , wherein the ID face of the elastomeric body comprises a fluidside ramp region forming the rod-contacting area of the sealing lip and an airside ramp region forming the rod-contacting area of the wiping lip.
13. A reciprocating-rod seal as set forth in claim 12 , wherein the ID face of the elastomeric body comprises a shallow between the ramp regions that is not a rod-contacting area.
14. A reciprocating-rod seal as set forth in claim 1 , wherein the rigid support is made of metal and the elastomeric body is made of polyurethane, and wherein:
the rigid support further comprises a flange wall extending radially inward from an airside end of the retaining wall and an anchor wall extending in the fluidside direction from an ID end of the flange wall,
the flange wall and the airside face of the elastomeric body form the airside surface of the seal,
the anchor wall is embedded in the OD airside portion of the elastomeric body,
the ID face of the elastomeric body comprises a intermediate region that is not a rod-contacting area, and
the sealing lip applies more rod-contact forces than the wiping lip.
15. A method of making the reciprocating-rod seal set forth in claim 1 with a mold having a cavity formed by a first mold part having a channel corresponding to the seal's airside face and groove-forming projection, a second mold part having a channel corresponding to the seal's fluidside face and notch-forming projection, and a core mold part having a perimeter corresponding to the seal's ID face; said method comprising the step of:
placing the rigid retainer in the channel of the first mold part;
compiling the mold parts to close the mold cavity; and
introducing elastomer into the closed mold cavity;
wherein the rigid retainer prevents the elastomer from flowing axially or radially beyond the retaining wall in the mold cavity.
16. A reciprocating-rod assembly comprising a housing, a rod that reciprocally moves relative to the housing, and the seal set forth in claim 1 ; wherein:
the housing comprise an opening through which the rod extends and pocket surrounding the opening;
the seal is installed in the pocket and its retaining wall abuts against the floor of the pocket and OD fluidside portion lies flush against the ledge of the pocket;
the ID fluidside portion and the ID airside portion of the elastomeric body are compressed;
the sealing lip slidingly contacts the rod to prevent fluid escape from the housing during forward and return strokes of the rod, and
the wiping lip sliding contacts the rod to wipe the rod clean during return strokes.
17. A pump comprising the reciprocating rod assembly set forth in claim 16 , wherein the rod is a pony rod and/or a plunger rod that is reciprocally moved to suction and discharge a working fluid.
18. A pump as set forth in claim 17 , wherein the working fluid is mud slurry whereby the pump is a mudpump.
19. A pump as set forth in claim 17 , wherein the seal is the only seal on the reciprocating rod.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/241,674 US20090189354A1 (en) | 2008-01-25 | 2008-09-30 | Reciprocating-rod seal |
US14/606,349 US9605672B2 (en) | 2008-01-25 | 2015-01-27 | Reciprocating-rod seal |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US2345208P | 2008-01-25 | 2008-01-25 | |
US12/241,674 US20090189354A1 (en) | 2008-01-25 | 2008-09-30 | Reciprocating-rod seal |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/606,349 Continuation US9605672B2 (en) | 2008-01-25 | 2015-01-27 | Reciprocating-rod seal |
Publications (1)
Publication Number | Publication Date |
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US20090189354A1 true US20090189354A1 (en) | 2009-07-30 |
Family
ID=40898422
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/241,674 Abandoned US20090189354A1 (en) | 2008-01-25 | 2008-09-30 | Reciprocating-rod seal |
US14/606,349 Active US9605672B2 (en) | 2008-01-25 | 2015-01-27 | Reciprocating-rod seal |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US14/606,349 Active US9605672B2 (en) | 2008-01-25 | 2015-01-27 | Reciprocating-rod seal |
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US (2) | US20090189354A1 (en) |
Families Citing this family (7)
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CA2830976C (en) | 2012-10-24 | 2019-02-12 | Certainteed Corporation | System, method and apparatus for manufactured building panel |
USD809671S1 (en) | 2013-10-22 | 2018-02-06 | Certainteed Corporation | Manufactured siding panel with frame |
DE202014011034U1 (en) * | 2014-11-28 | 2017-06-23 | Elringklinger Ag | sealing element |
BR102016027258B1 (en) | 2016-11-21 | 2023-02-14 | Fmc Technologies Do Brasil Ltda | MECHANICAL SEAL FOR BIDIRECTIONAL SEALING |
CN107081874B (en) * | 2017-05-31 | 2019-08-06 | 潍坊裕元电子有限公司 | A kind of lithium battery thin-walled rubber ring injection mold and the preparation process using the mold injection thin-walled rubber ring |
US11339779B2 (en) | 2017-09-27 | 2022-05-24 | Natural Gas Solutions North America, Llc | Containing fluid leaks on additive pumps |
USD906485S1 (en) | 2017-09-27 | 2020-12-29 | Natural Gas Solutions North America, Llc | Shaft seal |
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Also Published As
Publication number | Publication date |
---|---|
US9605672B2 (en) | 2017-03-28 |
US20150233371A1 (en) | 2015-08-20 |
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Free format text: ABANDONED -- AFTER EXAMINER'S ANSWER OR BOARD OF APPEALS DECISION |