US20010000319A1 - Piston rod seal assembly for walking beam compressor - Google Patents
Piston rod seal assembly for walking beam compressor Download PDFInfo
- Publication number
- US20010000319A1 US20010000319A1 US09/728,753 US72875300A US2001000319A1 US 20010000319 A1 US20010000319 A1 US 20010000319A1 US 72875300 A US72875300 A US 72875300A US 2001000319 A1 US2001000319 A1 US 2001000319A1
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- United States
- Prior art keywords
- annular
- piston rod
- insert
- top cap
- seal
- 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.)
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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
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
- F04B53/162—Adaptations of cylinders
- F04B53/164—Stoffing boxes
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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
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
- F04B39/0022—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons piston rods
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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
- F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
- F04B47/02—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps the driving mechanisms being situated at ground level
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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
- F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
- F04B47/02—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps the driving mechanisms being situated at ground level
- F04B47/028—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps the driving mechanisms being situated at ground level details of the walking beam
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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
- F04B53/144—Adaptation of piston-rods
- F04B53/146—Piston-rod guiding arrangements
Definitions
- This invention relates to a walking beam compressor, and more particularly to a walking beam compressor which has a rod collar assembly to minimize wear of the compressor rod seals.
- the compressor also has an improved piston rod seal assembly and an improved piston assembly.
- a pumping unit for an oil well typically includes a compressor mounted between the walking beam and the Samson post or other stationary part of the pumping unit.
- a chronic problem associated with walking beam compressors is that rod side loading often occurs which results in excessive wear of the rod seals in the rod seal assembly of the compressor which engage the piston rod as it moves up and down.
- Various attempts have been made to overcome the problems associated with side loading.
- Mayland U.S. Pat. No. 5,290,156 discloses the use of spherical bearings at each of the connecting ends of the compressor to allow universal movement in response to any lateral displacement or side loading. Studinger U.S. Pat. No.
- 4,345,744 uses spherical bearings at each of the connecting ends of the compressor to allow non-restricted, omni-directional movement at both connecting ends.
- McCoy U.S. Pat. No. 4,530,646 has a swivel connector at opposite ends for connecting the compressor to the walking beam and the Samson post to accommodate side loading.
- McClung U.S. Pat. No. 3,655,301 has knuckle joints and a buckle adjuster to minimize side loading. While these devices are satisfactory for their intended purpose, no attempt has been made to modify the compressor structure to minimize side loads thereon.
- the present invention is directed to a walking beam compressor having a rod collar assembly attached to the top cap of the compressor cylinder and has bearings which absorb side loading imposed on the piston rod.
- the rod collar assembly includes a sleeve which extends upwardly from the top cap and supports a pair of stacked inserts which form a recess to support a bearing through which the piston rod extends.
- the top cap includes a top cap assembly which supports a pair of vertically stacked seals sandwiched between three inserts.
- the inserts are housed in a counterbore formed in the top cap and covered by an insert cap thereabove.
- Each of the upper and lower inserts houses a wear ring so that one wear ring is above the seals and the other wear ring is below the seals.
- the piston is divided into an upper section and a lower section to facilitate the mounting of a peripheral seal at the mating surfaces of these sections.
- the peripheral edge of each section has a recess for receiving a wear ring.
- a structure is provided to facilitate separating the upper and lower sections during disassembly.
- FIG. 1 is a fragmentary side elevation of an oil well pump incorporating the novel compressor of this invention
- FIG. 2 is a greatly enlarged fragmentary vertical section of the compressor of FIG. 1;
- FIG. 3 is a still further enlarged fragmentary vertical section showing further details of the piston rod seal assembly.
- an oil well pump P as shown in FIG. 1, includes a walking beam 10 pivotally mounted by bearing 11 on the top of Samson post 12 .
- a horsehead 14 on one end of walking beam 10 is connected to rod 16 for operating a downhole pumping system as is well understood in the oil production industry.
- a connecting rod 18 is connected through linkage 20 to gear box 22 which drives pump P.
- Compressor C has a piston rod 24 attached at its upper end to coupling 26 which is pivotally mounted in bracket 28 attached to walking beam 10 by bracket 30 .
- Compressor C has a lower support leg 32 whose upper end is connected to lower cover plate 34 of cylinder 36 and whose lower end is pivotally connected to a bracket 38 attached to a leg of Samson post 12 by a clamp 40 .
- Additional clamps 42 may be provided at each end of clamp 40 , as shown, to minimize possible movement of clamp 40 along the leg of Samson post 12 during the pumping operation.
- the lower end of compressor C is shown as being attached to a leg of Samson post 12 , it will be understood that it may be attached to base 44 , if desired.
- cylinder 36 has an upper cover plate or cap 46 .
- These three parts are held together by a plurality of bolts 48 spaced about the periphery of cylinder 36 , extending through the peripheral flanges of lower cover plate 34 and upper cover plate 46 , as shown.
- lower cover plate 34 has a peripheral recess for receiving an O-ring 50 to form a fluid-tight seal with the inner surface of cylinder 36 .
- top cap 46 has a peripheral groove for receiving an O-ring 52 which also forms a fluid-tight seal with the inner peripheral surface of cylinder 36 .
- a rod collar assembly 54 is concentrically mounted on the upper surface of top cap and includes a cylindrical sleeve 56 which is sized to fit around a circular crown 58 which extends above the top surface of top cap 46 .
- Sleeve 56 has a lower peripheral flange 60 attached thereto, as by welding.
- a plurality of circumferentially spaced bolts 62 extend through lower flange 60 to connect the collar assembly 54 to top cap 46 .
- An upper peripheral flange 64 is attached, as by welding, to the upper end of sleeve 56 .
- Upper peripheral flange 64 supports a bearing assembly 65 having a pair of mounting rings 66 and 68 , one above the other, which are held in place by peripherally spaced bolts 70 extending through the mounting rings 66 and 68 and upper flange 64 , as show.
- mounting ring 66 is thicker than mounting ring 68 to facilitate assembly which will be apparent from the description to follow.
- first lower mounting ring 66 is slid down over piston rod 24 so that it is positioned on flange 64 .
- arcuate lower bearing insert 72 is placed in a first central bore 74 of lower mounting ring 66 so that it rests upon rim 76 , as shown.
- annular bearing 78 is slid down over piston rod 24 and into the space between the inner surface of arcuate lower bearing insert 72 and the outer surface of piston rod 24 so that the lower end of annular bearing 78 rests on inwardly projecting flange 80 at the lower end of arcuate bearing insert 72 .
- arcuate upper bearing insert 82 is dropped down around the upper end of annular bearing 78 so that its upper peripheral flange 84 engages the top edge of annular bearing 78 . Since the upper edge of lower mounting ring 66 extends above the upper edge of arcuate bearing insert 72 , an annular recess is provided to receive the lower end of arcuate upper bearing insert 82 so that it is supported between lower mounting ring 66 and bearing 78 . Finally, upper bearing ring 68 is placed over upper bearing insert 82 so that a second central bore 85 thereof slides over annular bearing insert 82 and rim 86 engages the upper edge of bearing insert 82 to hold it in place. Bolts 70 hold the entire bearing assembly together as previously described. It will the apparent that with the structure just described, bearing 78 will absorb lateral or side forces imposed by piston rod 24 thereby reducing wear on the seals within piston rod assembly 90 on top cap 46 .
- Top cap 46 has a cylindrical cavity 92 which receives an annular lower insert 94 .
- Annular lower insert 94 has an upper flange 96 and a lower shorter flange 98 forming a peripheral recess 100 for holding lower wear ring 102 .
- lower wear ring 102 is in the form of a split ring so that it can slide into place over lower flange 98 .
- a first lower O-ring 104 is received in an outer peripheral groove of annular lower insert 94 to provide a fluid seal between annular lower insert 94 and the surface of bore 92 .
- An A-shaped annular lower seal 106 rests upon upper flange 96 so that the inner leg thereof engages piston rod 24 to provide a fluid seal.
- annular center insert 108 rests upon the upper edge of annular lower insert 94 and has and inwardly projecting flange 110 for supporting an A-shaped annular upper seal 112 whose inner leg engages piston rod 24 to provide a further fluid seal.
- Annular center insert 108 also has a peripheral recess for receiving a second upper O-ring 114 which engages the inner surface of insert cap 116 to provide a further fluid seal.
- An annular upper insert 118 rests upon the upper edge of annular center insert 108 and has an inner peripheral recess 120 formed by lower flange 122 and upper shorter flange 124 for receiving upper wear ring 126 .
- a hollow insert cap 116 is placed over the inserts, as shown, and is held in place by peripherally spaced bolts 128 which extend through insert cap 116 and into top cap 46 .
- the piston rod assembly 90 just described, provides a substantially fluid-tight seal between piston rod 24 and top cap 46 .
- a novel piston assembly 130 is shown in FIG. 2.
- the piston assembly is divided into an annular lower section 132 and a separate annular upper section 134 which facilitates the mounting of annular piston seal 136 therein.
- seal 136 prior to assembly of the two annular sections 132 and 134 , seal 136 can easily be positioned in groove 138 in lower section 132 and then upper section 134 can be placed on top of lower section 132 .
- the upper facing surface 139 of lower section 132 has a circular depression 140 for receiving a circular boss 142 on the lower facing surface 143 of upper section 134 so that the upper and lower sections are properly aligned. It will be understood that boss 142 and depression 140 could be reversed so that the depression is in upper section 134 and the boss is in lower section 132 .
- Lower section 132 has a peripheral groove 144 for receiving a split lower wear ring 146 for engaging the inner surface of cylinder 36 .
- upper section 134 has a peripheral groove 148 for receiving a split upper wear ring 150 .
- Lower section 132 also has a center recess 152 for receiving nut 154 which is threaded on the lower end of piston rod 24 and holds lower section 132 in fixed position with respect to upper section 134 .
- Seal 136 in groove 138 , is sandwiched between the upper and lower sections.
- a wrench can be positioned at notches 156 near the top of piston rod 24 to hold it from rotating.
- Recess 152 is sufficiently deep so that nut 154 does not extend below the bottom surface of lower section 132 .
- Piston rod 24 has a reduced lower section 156 which is sized to fit through opening 158 in upper section 134 and forms a shoulder 159 which abuts with the top surface of upper section 134 .
- the length of reduced section 156 is such that the threaded lower end thereof does not extend below the lower surface of lower section 132 .
- two or more threaded holes 160 extend through bottom section 132 within recess 152 . These threaded holes 160 can be used to assist in disassembly of the piston sections 132 and 134 which may become swaged during assembly. Thus, by inserting bolts in the threaded holes 160 and sequentially tightening them against upper section 134 , the sections can be separated.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
Description
- 1. This invention relates to a walking beam compressor, and more particularly to a walking beam compressor which has a rod collar assembly to minimize wear of the compressor rod seals. The compressor also has an improved piston rod seal assembly and an improved piston assembly.
- 2. Typically, a pumping unit for an oil well includes a compressor mounted between the walking beam and the Samson post or other stationary part of the pumping unit. A chronic problem associated with walking beam compressors is that rod side loading often occurs which results in excessive wear of the rod seals in the rod seal assembly of the compressor which engage the piston rod as it moves up and down. Various attempts have been made to overcome the problems associated with side loading. For example, Mayland U.S. Pat. No. 5,290,156 discloses the use of spherical bearings at each of the connecting ends of the compressor to allow universal movement in response to any lateral displacement or side loading. Studinger U.S. Pat. No. 4,345,744 uses spherical bearings at each of the connecting ends of the compressor to allow non-restricted, omni-directional movement at both connecting ends. McCoy U.S. Pat. No. 4,530,646 has a swivel connector at opposite ends for connecting the compressor to the walking beam and the Samson post to accommodate side loading. McClung U.S. Pat. No. 3,655,301 has knuckle joints and a buckle adjuster to minimize side loading. While these devices are satisfactory for their intended purpose, no attempt has been made to modify the compressor structure to minimize side loads thereon.
- 3. The present invention is directed to a walking beam compressor having a rod collar assembly attached to the top cap of the compressor cylinder and has bearings which absorb side loading imposed on the piston rod. The rod collar assembly includes a sleeve which extends upwardly from the top cap and supports a pair of stacked inserts which form a recess to support a bearing through which the piston rod extends.
- 4. Conveniently, the top cap includes a top cap assembly which supports a pair of vertically stacked seals sandwiched between three inserts. The inserts are housed in a counterbore formed in the top cap and covered by an insert cap thereabove. Each of the upper and lower inserts houses a wear ring so that one wear ring is above the seals and the other wear ring is below the seals.
- 5. The piston is divided into an upper section and a lower section to facilitate the mounting of a peripheral seal at the mating surfaces of these sections. The peripheral edge of each section has a recess for receiving a wear ring. A structure is provided to facilitate separating the upper and lower sections during disassembly.
- 6. Additional advantages of this invention will become apparent from the description which follows, taken in conjunction with the accompanying drawings.
- 7.FIG. 1 is a fragmentary side elevation of an oil well pump incorporating the novel compressor of this invention;
- 8.FIG. 2 is a greatly enlarged fragmentary vertical section of the compressor of FIG. 1; and
- 9.FIG. 3 is a still further enlarged fragmentary vertical section showing further details of the piston rod seal assembly.
- 10. In accordance with this invention, an oil well pump P, as shown in FIG. 1, includes a
walking beam 10 pivotally mounted by bearing 11 on the top of Samsonpost 12. Ahorsehead 14 on one end ofwalking beam 10 is connected torod 16 for operating a downhole pumping system as is well understood in the oil production industry. A connectingrod 18 is connected throughlinkage 20 togear box 22 which drives pump P. Compressor C has apiston rod 24 attached at its upper end to coupling 26 which is pivotally mounted inbracket 28 attached towalking beam 10 bybracket 30. Compressor C has alower support leg 32 whose upper end is connected tolower cover plate 34 ofcylinder 36 and whose lower end is pivotally connected to abracket 38 attached to a leg of Samsonpost 12 by aclamp 40.Additional clamps 42 may be provided at each end ofclamp 40, as shown, to minimize possible movement ofclamp 40 along the leg of Samsonpost 12 during the pumping operation. Although the lower end of compressor C is shown as being attached to a leg of Samsonpost 12, it will be understood that it may be attached tobase 44, if desired. - 11. The details of the compressor C are best understood with reference to FIGS. 2 and 3. In addition to a
lower cover plate 34,cylinder 36 has an upper cover plate orcap 46. These three parts are held together by a plurality ofbolts 48 spaced about the periphery ofcylinder 36, extending through the peripheral flanges oflower cover plate 34 andupper cover plate 46, as shown. Advantageously,lower cover plate 34 has a peripheral recess for receiving an O-ring 50 to form a fluid-tight seal with the inner surface ofcylinder 36. Similarly,top cap 46 has a peripheral groove for receiving an O-ring 52 which also forms a fluid-tight seal with the inner peripheral surface ofcylinder 36. - 12. A
rod collar assembly 54 is concentrically mounted on the upper surface of top cap and includes acylindrical sleeve 56 which is sized to fit around acircular crown 58 which extends above the top surface oftop cap 46.Sleeve 56 has a lowerperipheral flange 60 attached thereto, as by welding. A plurality of circumferentially spacedbolts 62 extend throughlower flange 60 to connect thecollar assembly 54 totop cap 46. An upperperipheral flange 64 is attached, as by welding, to the upper end ofsleeve 56. Upperperipheral flange 64 supports abearing assembly 65 having a pair ofmounting rings bolts 70 extending through themounting rings upper flange 64, as show. Advantageously, mountingring 66 is thicker than mountingring 68 to facilitate assembly which will be apparent from the description to follow. - 13. During assembly of the upper portion of
rod collar assembly 54, firstlower mounting ring 66 is slid down overpiston rod 24 so that it is positioned onflange 64. Next, arcuatelower bearing insert 72 is placed in a firstcentral bore 74 oflower mounting ring 66 so that it rests uponrim 76, as shown. Next,annular bearing 78 is slid down overpiston rod 24 and into the space between the inner surface of arcuatelower bearing insert 72 and the outer surface ofpiston rod 24 so that the lower end of annular bearing 78 rests on inwardly projectingflange 80 at the lower end ofarcuate bearing insert 72. Next, arcuate upper bearinginsert 82 is dropped down around the upper end ofannular bearing 78 so that its upperperipheral flange 84 engages the top edge ofannular bearing 78. Since the upper edge oflower mounting ring 66 extends above the upper edge ofarcuate bearing insert 72, an annular recess is provided to receive the lower end of arcuate upper bearing insert 82 so that it is supported betweenlower mounting ring 66 and bearing 78. Finally,upper bearing ring 68 is placed over upper bearing insert 82 so that a secondcentral bore 85 thereof slides overannular bearing insert 82 andrim 86 engages the upper edge of bearing insert 82 to hold it in place.Bolts 70 hold the entire bearing assembly together as previously described. It will the apparent that with the structure just described, bearing 78 will absorb lateral or side forces imposed bypiston rod 24 thereby reducing wear on the seals withinpiston rod assembly 90 ontop cap 46. - 14. The piston
rod seal assembly 90 is best seen in FIG. 3.Top cap 46 has acylindrical cavity 92 which receives an annularlower insert 94. Annularlower insert 94 has anupper flange 96 and a lowershorter flange 98 forming aperipheral recess 100 for holdinglower wear ring 102. Conveniently,lower wear ring 102 is in the form of a split ring so that it can slide into place overlower flange 98. A first lower O-ring 104 is received in an outer peripheral groove of annularlower insert 94 to provide a fluid seal between annularlower insert 94 and the surface ofbore 92. An A-shaped annularlower seal 106 rests uponupper flange 96 so that the inner leg thereof engagespiston rod 24 to provide a fluid seal. - 15. An
annular center insert 108 rests upon the upper edge of annularlower insert 94 and has and inwardly projectingflange 110 for supporting an A-shaped annularupper seal 112 whose inner leg engagespiston rod 24 to provide a further fluid seal.Annular center insert 108 also has a peripheral recess for receiving a second upper O-ring 114 which engages the inner surface ofinsert cap 116 to provide a further fluid seal. - 16. An annular
upper insert 118 rests upon the upper edge ofannular center insert 108 and has an innerperipheral recess 120 formed bylower flange 122 and uppershorter flange 124 for receivingupper wear ring 126. Ahollow insert cap 116 is placed over the inserts, as shown, and is held in place by peripherally spacedbolts 128 which extend throughinsert cap 116 and intotop cap 46. Thepiston rod assembly 90 just described, provides a substantially fluid-tight seal betweenpiston rod 24 andtop cap 46. - 17. A
novel piston assembly 130 is shown in FIG. 2. Conveniently, the piston assembly is divided into an annularlower section 132 and a separate annularupper section 134 which facilitates the mounting ofannular piston seal 136 therein. In the prior art, it was necessary to stretch a piston seal over the piston and into a peripheral groove formed therein. Because the seal was not very elastic, it was only with great difficulty and much effort that the seal could be gotten into place. With the present invention, prior to assembly of the twoannular sections groove 138 inlower section 132 and thenupper section 134 can be placed on top oflower section 132. Conveniently, the upper facingsurface 139 oflower section 132 has acircular depression 140 for receiving acircular boss 142 on the lower facingsurface 143 ofupper section 134 so that the upper and lower sections are properly aligned. It will be understood thatboss 142 anddepression 140 could be reversed so that the depression is inupper section 134 and the boss is inlower section 132.Lower section 132 has aperipheral groove 144 for receiving a splitlower wear ring 146 for engaging the inner surface ofcylinder 36. Similarly,upper section 134 has aperipheral groove 148 for receiving a splitupper wear ring 150.Lower section 132 also has acenter recess 152 for receivingnut 154 which is threaded on the lower end ofpiston rod 24 and holdslower section 132 in fixed position with respect toupper section 134.Seal 136, ingroove 138, is sandwiched between the upper and lower sections. - 18. During tightening of
nut 154, a wrench, not shown, can be positioned atnotches 156 near the top ofpiston rod 24 to hold it from rotating.Recess 152 is sufficiently deep so thatnut 154 does not extend below the bottom surface oflower section 132.Piston rod 24 has a reducedlower section 156 which is sized to fit throughopening 158 inupper section 134 and forms ashoulder 159 which abuts with the top surface ofupper section 134. The length of reducedsection 156 is such that the threaded lower end thereof does not extend below the lower surface oflower section 132. Whennut 154 is fully tightened,circular boss 142 is fully received withindepression 140 so thatupper surface 139 is in contact withlower surface 143, as shown. - 19. Advantageously, two or more threaded
holes 160 extend throughbottom section 132 withinrecess 152. These threadedholes 160 can be used to assist in disassembly of thepiston sections holes 160 and sequentially tightening them againstupper section 134, the sections can be separated. - 20. This invention has been described in detail with reference to particular embodiments thereof, but it will be understood that various other modifications can be effected within the spirit and scope of this invention.
Claims (3)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/728,753 US6305918B2 (en) | 1997-10-03 | 2000-12-04 | Piston rod seal assembly for walking beam compressor |
US09/950,362 US6572116B2 (en) | 1997-10-03 | 2001-09-10 | Piston assembly for walking beam compressor |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US6118497P | 1997-10-03 | 1997-10-03 | |
US09/132,697 US6164935A (en) | 1997-10-03 | 1998-08-11 | Walking beam compressor |
US09/728,753 US6305918B2 (en) | 1997-10-03 | 2000-12-04 | Piston rod seal assembly for walking beam compressor |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/132,697 Division US6164935A (en) | 1997-10-03 | 1998-08-11 | Walking beam compressor |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/950,362 Continuation US6572116B2 (en) | 1997-10-03 | 2001-09-10 | Piston assembly for walking beam compressor |
Publications (2)
Publication Number | Publication Date |
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US20010000319A1 true US20010000319A1 (en) | 2001-04-19 |
US6305918B2 US6305918B2 (en) | 2001-10-23 |
Family
ID=26740812
Family Applications (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/132,697 Expired - Lifetime US6164935A (en) | 1997-10-03 | 1998-08-11 | Walking beam compressor |
US09/728,753 Expired - Lifetime US6305918B2 (en) | 1997-10-03 | 2000-12-04 | Piston rod seal assembly for walking beam compressor |
US09/728,752 Abandoned US20010000318A1 (en) | 1997-10-03 | 2000-12-04 | Piston for walking beam compressor |
US09/950,362 Expired - Lifetime US6572116B2 (en) | 1997-10-03 | 2001-09-10 | Piston assembly for walking beam compressor |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/132,697 Expired - Lifetime US6164935A (en) | 1997-10-03 | 1998-08-11 | Walking beam compressor |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/728,752 Abandoned US20010000318A1 (en) | 1997-10-03 | 2000-12-04 | Piston for walking beam compressor |
US09/950,362 Expired - Lifetime US6572116B2 (en) | 1997-10-03 | 2001-09-10 | Piston assembly for walking beam compressor |
Country Status (3)
Country | Link |
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US (4) | US6164935A (en) |
AU (1) | AU9669398A (en) |
WO (1) | WO1999018354A2 (en) |
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US20100326772A1 (en) * | 2009-06-24 | 2010-12-30 | Thomas Peter Corden | Lubrication Disc Assembly |
DE102010053900B4 (en) * | 2010-12-09 | 2012-10-31 | Netzsch Oilfield Products Gmbh | Sealing system for borehole pumps |
US9073527B2 (en) * | 2011-03-31 | 2015-07-07 | Haldex Brake Corporation | Smooth bore dynamic center seal for spring brake actuator |
US9689251B2 (en) | 2014-05-08 | 2017-06-27 | Unico, Inc. | Subterranean pump with pump cleaning mode |
CA2967606C (en) | 2017-05-18 | 2023-05-09 | Peter Neufeld | Seal housing and related apparatuses and methods of use |
JP6994397B2 (en) * | 2018-01-30 | 2022-01-14 | 株式会社神戸製鋼所 | Reciprocating compressor |
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-
1998
- 1998-08-11 US US09/132,697 patent/US6164935A/en not_active Expired - Lifetime
- 1998-09-25 WO PCT/US1998/020206 patent/WO1999018354A2/en active Application Filing
- 1998-09-25 AU AU96693/98A patent/AU9669398A/en not_active Abandoned
-
2000
- 2000-12-04 US US09/728,753 patent/US6305918B2/en not_active Expired - Lifetime
- 2000-12-04 US US09/728,752 patent/US20010000318A1/en not_active Abandoned
-
2001
- 2001-09-10 US US09/950,362 patent/US6572116B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103994051A (en) * | 2014-05-20 | 2014-08-20 | 西安交通大学 | Magnetic force guiding mechanism for piston accurate centering of labyrinth compressor |
Also Published As
Publication number | Publication date |
---|---|
US6305918B2 (en) | 2001-10-23 |
AU9669398A (en) | 1999-04-27 |
WO1999018354A2 (en) | 1999-04-15 |
US20020005615A1 (en) | 2002-01-17 |
US6572116B2 (en) | 2003-06-03 |
US6164935A (en) | 2000-12-26 |
WO1999018354A3 (en) | 1999-05-20 |
US20010000318A1 (en) | 2001-04-19 |
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