US3720140A - Pump piston - Google Patents

Pump piston Download PDF

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Publication number
US3720140A
US3720140A US00173506A US3720140DA US3720140A US 3720140 A US3720140 A US 3720140A US 00173506 A US00173506 A US 00173506A US 3720140D A US3720140D A US 3720140DA US 3720140 A US3720140 A US 3720140A
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United States
Prior art keywords
piston
cylinder
sealing ring
flange portion
cylindrical portion
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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.)
Expired - Lifetime
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US00173506A
Inventor
L Lee
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Chromalloy American Corp
Murphy Industries Inc
GW Murphy Industries Inc
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Murphy Industries Inc
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Assigned to CHROMALLOY AMERICAN CORPORATION, A CORP OF DE. reassignment CHROMALLOY AMERICAN CORPORATION, A CORP OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BAKER OIL TOOLS, INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

Definitions

  • ABSTRACT Field of Search ..92/87, 240, 244; 277/227, 233, A single-acting pump having an elastomeric and 277/71 synthetic fabric piston seal ring and means to supply fluid to the piston to cool and clean the piston and cylinder.
  • PUMP PISTON SUMMARY This invention relates to pump pistons for use in mud or slush pumps used in connection with petroleum well drilling apparatus, pipeline, mining and related industries, and particularly to a piston having an elastomeric seal ring including synthetic material fabric and fluid means for washing, cooling and lubricating the piston and the wall of the cylinder or liner in which it operates.
  • the piston In double-acting pumps, the piston is flooded on both sides, as is the liner, with the fluid being pumped, whereas, in a single-acting pump, only the working face of the piston is so flooded so that on the back stroke of the piston abrasive substances may be on the liner, and the wall thereof may be relatively dry, which can result in abrasive wear on the piston, seal ring and liner wall, and which may result in excessive heating of these parts particularly in modern high speed pumps.
  • FIG. 1 is fragmentary sectional view of a single-acting pump showing the piston in operating position in a liner.
  • FIG. 2 is an enlarged view, partly in axial section, of the pump and piston shown in FIG. 1. 1
  • FIG. 3 is an enlarged view, partly in axial section, showing another embodiment of the invention.
  • a pump piston cylinder assembly comprising a single-acting piston carried by a piston rod 11 and adapted for reciprocation within a cylinder or liner 12.
  • the piston 10 includes a piston head 13 having an axially extending cylindrical portion 14 and a radially extending annular flange 15.
  • the piston rod 11 has a reduced threaded rod 11 may have wrench flats 23 thereon to hold the rod with a wrench while the nut 18 is being applied to or removed from the rod.
  • the rod 11 has a flange 24 which is adapted to be connected to a power source which is shown generally at 25.
  • the piston head 13 has a groove 26 into which is disposed a seal ring 27 to effect sealing between the end 16, the head 13 and the flange 17.
  • the seal ring 20 may comprise generally an elastomeric material such as Buna-N or, other suitable material, having molded therein a fabric 26 which may comprise: a regular weave or square woven nylon fabric or other suitable synthetic material.
  • the periphery of flange 15 when new has a small diametral clearance with the wall of the liner 12 of preferably about two and one-half thousandths to about seven and one-half thousandths of an inch.
  • the flange 15 has an annular groove 28 in its periphery.
  • a radially extending hole 29 is drilled inwardly from the bottom of the groove 28.
  • Another hole 30 is provided in flange 15 to intersect hole 29 and thereby establish communication with the annular groove 28.
  • a tube 31 is secured in the hole 30. Seal means 31a is provided between the wall of the hole 30 and the tube 31.
  • the tube 31 may be secured to the piston rod 11 by means of clamps 32.
  • a flexible conduit 33 is connected at one end to the tube 31 and connected at its other end to a pressure source of fluid, which may be water or other suitable fluid. As can be seen in FIG. 1, the flexible conduit permits the piston to be moved from its rearward position, as shown, to a forward position, moving a distance indicated at 34.
  • FIG. 3 Another embodiment of the invention is shown in FIG. 3, which is similar to that shown in FIGS. 1 and 2, except that fluid supply in this embodiment is carried through flexible conduit which is threadedly secured into piston rod 41, communicating with passageways 42 and 43.
  • the flange 44 of piston head 45 has passageways 46 communicating with passageway 43 and an annular groove 47 in the periphery of flange 44.
  • fluid in sufficient volume under ample pressure is forced between the piston flange and cylinder to form a continuous film of fluid behind the piston.
  • This fluid film cools, cleans and lubricates the seal ring and cylinder and helps to prevent air and foreign material from being drawn into the working chamber by the piston on its back stroke.
  • the fluid forced through the small clearance between the piston flange and cylinder is more efficient, more uniformly distributed, and less fluid is required than an open spray system which directs a stream of liquid onto the back side of the piston.
  • the fabric 26, which is preferably nylon or the like molded into the seal ring 20, is much superior to the cotton fabrics previously used in such pump piston seals because it has higher tensile strength, a lower coefficient of friction and a good ability to stretch before breaking. Such a seal will have greatly increased field performance if it can be kept sufficiently cool in operation.
  • Nylon or the like is much more heat sensitive than cotton fabric, but its other properties, as above mentioned, make such a nylon-reinforced seal very desirable especially for use in modern high speed pumps. With the cooling arrangement of my invention, such seal has been proven to be superior in actual field use.
  • said single acting piston including an axially extending cylindrical portion terminating in an enlarged radially extending annular flange portion, said cylindrical portion having an external diameter considerably less than the internal diameter of said cylinder and said annular flange portion having a diameter commensurate with the internal diameter of said cylinder,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Sealing Devices (AREA)

Abstract

A single-acting pump having an elastomeric and synthetic fabric piston seal ring and means to supply fluid to the piston to cool and clean the piston and cylinder.

Description

United StHtES Patent 1 1 1 11 3,72%140 Lee 1March 13, 1973 PUMP PISTON 1 [56] References Cited Inventor: Larry E. Lee, HOUStOn, TEX. UNITED STATES PATENTS Assign: Industries 2,545,506 3/1951 Walsh ..92/87 x Houston. x 2,677,581 5/1954 Taylor, Jr. ..277/l88 [22] Filed: M817 1971' 3,104,619 9/1963 Swarthout ..92/87 [21] App]. No.1 173,506 Primary Examiner-Martin P. Schwadron Assistant ExaminerA. Hershkovitz 52 U.S. c1. ..92/s7, 92/240, 277/71, Kuwa 51 rm. c1 ..F0lb31/00 [57] ABSTRACT [58] Field of Search ..92/87, 240, 244; 277/227, 233, A single-acting pump having an elastomeric and 277/71 synthetic fabric piston seal ring and means to supply fluid to the piston to cool and clean the piston and cylinder.
1 Claim, 3 Drawing Figures PATEF-HFUHARISIFJH 3,720,140
' SHEET 1 [1F 2 LARRY E. LEE
I N VENTOR.
y ry Wm ATTORNEY LARRY E. LEE
INVENTOR.
PUMP PISTON SUMMARY This invention relates to pump pistons for use in mud or slush pumps used in connection with petroleum well drilling apparatus, pipeline, mining and related industries, and particularly to a piston having an elastomeric seal ring including synthetic material fabric and fluid means for washing, cooling and lubricating the piston and the wall of the cylinder or liner in which it operates.
In double-acting pumps, the piston is flooded on both sides, as is the liner, with the fluid being pumped, whereas, in a single-acting pump, only the working face of the piston is so flooded so that on the back stroke of the piston abrasive substances may be on the liner, and the wall thereof may be relatively dry, which can result in abrasive wear on the piston, seal ring and liner wall, and which may result in excessive heating of these parts particularly in modern high speed pumps.
It is an object of this invention to provide a new and improved piston for a single-acting pump, which piston employs an elastomeric seal ring having synthetic material fabric which has a relatively low operating temperature limit but which gives superior results over other piston seals when supplied with the new and improved fluid circulating system of the invention.
My invention has other objects and advantages some of which, with the foregoing, will be set forth in the description which follows.
I BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is fragmentary sectional view of a single-acting pump showing the piston in operating position in a liner.
FIG. 2 is an enlarged view, partly in axial section, of the pump and piston shown in FIG. 1. 1
FIG. 3 is an enlarged view, partly in axial section, showing another embodiment of the invention.
DESCRIPTION OF THE PREFERRED- EMBODIMENTS Referring to FIGS. 1 and 2, a pump piston cylinder assembly is shown comprising a single-acting piston carried by a piston rod 11 and adapted for reciprocation within a cylinder or liner 12. The piston 10 includes a piston head 13 having an axially extending cylindrical portion 14 and a radially extending annular flange 15. The piston rod 11 has a reduced threaded rod 11 may have wrench flats 23 thereon to hold the rod with a wrench while the nut 18 is being applied to or removed from the rod. The rod 11 has a flange 24 which is adapted to be connected to a power source which is shown generally at 25. The piston head 13 has a groove 26 into which is disposed a seal ring 27 to effect sealing between the end 16, the head 13 and the flange 17.
The seal ring 20 may comprise generally an elastomeric material such as Buna-N or, other suitable material, having molded therein a fabric 26 which may comprise: a regular weave or square woven nylon fabric or other suitable synthetic material.
The periphery of flange 15 when new has a small diametral clearance with the wall of the liner 12 of preferably about two and one-half thousandths to about seven and one-half thousandths of an inch. The flange 15 has an annular groove 28 in its periphery. A radially extending hole 29 is drilled inwardly from the bottom of the groove 28. Another hole 30 is provided in flange 15 to intersect hole 29 and thereby establish communication with the annular groove 28. A tube 31 is secured in the hole 30. Seal means 31a is provided between the wall of the hole 30 and the tube 31. The tube 31 may be secured to the piston rod 11 by means of clamps 32. A flexible conduit 33 is connected at one end to the tube 31 and connected at its other end to a pressure source of fluid, which may be water or other suitable fluid. As can be seen in FIG. 1, the flexible conduit permits the piston to be moved from its rearward position, as shown, to a forward position, moving a distance indicated at 34.
Another embodiment of the invention is shown in FIG. 3, which is similar to that shown in FIGS. 1 and 2, except that fluid supply in this embodiment is carried through flexible conduit which is threadedly secured into piston rod 41, communicating with passageways 42 and 43. The flange 44 of piston head 45 has passageways 46 communicating with passageway 43 and an annular groove 47 in the periphery of flange 44.
In operation, fluid in sufficient volume under ample pressure is forced between the piston flange and cylinder to form a continuous film of fluid behind the piston. This fluid film cools, cleans and lubricates the seal ring and cylinder and helps to prevent air and foreign material from being drawn into the working chamber by the piston on its back stroke.
The fluid forced through the small clearance between the piston flange and cylinder is more efficient, more uniformly distributed, and less fluid is required than an open spray system which directs a stream of liquid onto the back side of the piston.
The fabric 26, which is preferably nylon or the like molded into the seal ring 20, is much superior to the cotton fabrics previously used in such pump piston seals because it has higher tensile strength, a lower coefficient of friction and a good ability to stretch before breaking. Such a seal will have greatly increased field performance if it can be kept sufficiently cool in operation. Nylon or the like is much more heat sensitive than cotton fabric, but its other properties, as above mentioned, make such a nylon-reinforced seal very desirable especially for use in modern high speed pumps. With the cooling arrangement of my invention, such seal has been proven to be superior in actual field use.
While the embodiments of the invention as herein disclosed constitute preferred forms, it is to be understood that other forms may be adopted within the scope of the appended claims.
What is claimed is:
1. In a pump having a cylinder,
a single acting piston operative in said cylinder,
said single acting piston including an axially extending cylindrical portion terminating in an enlarged radially extending annular flange portion, said cylindrical portion having an external diameter considerably less than the internal diameter of said cylinder and said annular flange portion having a diameter commensurate with the internal diameter of said cylinder,
a single elastomeric sealing ring positioned upon the cylindrical portion of said piston in abutting engagement with said annular flange portion.
a member carried by said cylindrical portion and engaging said sealing ring to retain same in engagement with said flange, readily releasable means clamping said member and sealing ring upon said

Claims (1)

1. In a pump having a cylinder, a single acting piston operative in said cylinder, said single acting piston including an axially extending cylindrical portion terminating in an enlarged radially extending annular flange portion, said cylindrical portion having an external diameter considerably less than the internal diameter of said cylinder and said annular flange portion having a diameter commensurate with the internal diameter of said cylinder, a single elastomeric sealing ring positioned upon the cylindrical portion of said piston in abutting engagement with said annular flange portion. a member carried by said cylindrical portion and engaging said sealing ring to retain same in engagement with said flange, readily releasable means clamping said member and sealing ring upon said cylindrical portion of said piston, said sealing ring having a sliding engagement with the inner surface of said cylinder, said annular flange portion having a Circumferential fluid passageway provided in the peripheral surface thereof, said annular flange portion having fluid passageways communicating with said circumferential fluid passageway to conduct a fluid to the inner surface of said cylinder proximate said sealing ring and flange portion to form a continuous film of fluid behind said piston for cooling and cleaning the cylinder and sealing ring.
US00173506A 1971-08-27 1971-08-27 Pump piston Expired - Lifetime US3720140A (en)

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US17350671A 1971-08-27 1971-08-27

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4157057A (en) * 1976-11-18 1979-06-05 Reed Tool Company Single acting piston
US4270440A (en) * 1979-02-22 1981-06-02 Weatherford/Dmc High pressure piston and seal
US4449897A (en) * 1981-09-21 1984-05-22 Garrett William R Single-acting piston pump having two heads
US4553730A (en) * 1983-08-16 1985-11-19 Vicic John C Ram-type blowout preventer and packer therefor
US5778759A (en) * 1996-11-15 1998-07-14 Phoenix Energy Products, Incorporated Self-aligning piston rod
WO2009051493A2 (en) 2007-10-17 2009-04-23 Tt Sense Mud As Piston pump
US20110140013A1 (en) * 2009-12-15 2011-06-16 Stream-Flo Industries Ltd. Blowout preventer with rope packing seal
US8783643B2 (en) 2009-12-15 2014-07-22 Stream-Flo Industries Ltd. Blowout preventer and rams
US20150377232A1 (en) * 2014-06-26 2015-12-31 Tsc Manufacturing And Supply, Llc. Piston with a heat exchanger
US11326693B2 (en) * 2020-02-13 2022-05-10 Schlumberger Technology Corporation Lubrication system for a piston pump
US20230296088A1 (en) * 2020-08-13 2023-09-21 Up-Steel, S.R.O. Radial rotary piston machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2545506A (en) * 1945-10-17 1951-03-20 Raymond A Walsh Pump
US2677581A (en) * 1949-04-04 1954-05-04 Jr Raymond G Taylor Slush pump piston
US3104619A (en) * 1960-12-27 1963-09-24 Challenge Cook Bros Inc Piston head

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2545506A (en) * 1945-10-17 1951-03-20 Raymond A Walsh Pump
US2677581A (en) * 1949-04-04 1954-05-04 Jr Raymond G Taylor Slush pump piston
US3104619A (en) * 1960-12-27 1963-09-24 Challenge Cook Bros Inc Piston head

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4157057A (en) * 1976-11-18 1979-06-05 Reed Tool Company Single acting piston
US4270440A (en) * 1979-02-22 1981-06-02 Weatherford/Dmc High pressure piston and seal
US4449897A (en) * 1981-09-21 1984-05-22 Garrett William R Single-acting piston pump having two heads
US4553730A (en) * 1983-08-16 1985-11-19 Vicic John C Ram-type blowout preventer and packer therefor
US5778759A (en) * 1996-11-15 1998-07-14 Phoenix Energy Products, Incorporated Self-aligning piston rod
US9360007B2 (en) 2007-10-17 2016-06-07 Arne Lindekleiv Piston pump
WO2009051493A2 (en) 2007-10-17 2009-04-23 Tt Sense Mud As Piston pump
US20100263528A1 (en) * 2007-10-17 2010-10-21 Tt Sense Mud As Piston pump
NO329730B1 (en) * 2007-10-17 2010-12-13 Tts Sense Mud As Piston Pump
US8770091B2 (en) 2007-10-17 2014-07-08 Arne Lindekleiv Piston pump
US20110140013A1 (en) * 2009-12-15 2011-06-16 Stream-Flo Industries Ltd. Blowout preventer with rope packing seal
US8807516B2 (en) 2009-12-15 2014-08-19 Stream-Flo Industries Ltd. Blowout preventer with rope packing seal
US9243469B2 (en) 2009-12-15 2016-01-26 Stream-Flo Industries Ltd. Blowout preventer and rams
US8783643B2 (en) 2009-12-15 2014-07-22 Stream-Flo Industries Ltd. Blowout preventer and rams
US20150377232A1 (en) * 2014-06-26 2015-12-31 Tsc Manufacturing And Supply, Llc. Piston with a heat exchanger
US9581154B2 (en) * 2014-06-26 2017-02-28 Tsc Manufacturing And Supply, Llc. Piston with a heat exchanger
US11326693B2 (en) * 2020-02-13 2022-05-10 Schlumberger Technology Corporation Lubrication system for a piston pump
US20230296088A1 (en) * 2020-08-13 2023-09-21 Up-Steel, S.R.O. Radial rotary piston machine

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AS Assignment

Owner name: CHROMALLOY AMERICAN CORPORATION, 120 SOUTH CENTRAL

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BAKER OIL TOOLS, INC.;REEL/FRAME:004433/0027

Effective date: 19850709