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Title:
PLUNGER CLAMP FOR FLUID END
Document Type and Number:
WIPO Patent Application WO/2017/136044
Kind Code:
A1
Abstract:
A plunger clamp is disclosed that includes a body comprising a first end, a second end, and a clamp connector disposed between the first and second ends, wherein the clamp connector comprises a threaded portion that interfaces with one or both of the first and second ends facilitating relative rotation with, and separation from, the first and second ends and the clamp connector.

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JPH0874746PLUNGER PUMP
Inventors:
FREED, Wesley (179 Timberland Lane, Aledo, Texas, 76008, US)
CHUNN, Austin (402 Prairie Run, Aledo, Texas, 76008, US)
Application Number:
US2016/066598
Publication Date:
August 10, 2017
Filing Date:
December 14, 2016
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
FORUM US, INC. (920 Memorial City Way, Suite 1000Houston, Texas, 77024, US)
International Classes:
F04B53/14; F04B53/22
Foreign References:
US5127807A1992-07-07
US20130068092A12013-03-21
US20110142699A12011-06-16
US20120164004A12012-06-28
US20080116688A12008-05-22
US7350832B12008-04-01
Other References:
None
Attorney, Agent or Firm:
PATTERSON, B. Todd et al. (Patterson & Sheridan, LLP24 Greenway Plaza, Suite 160, Houston Texas, 77046, US)
Download PDF:
Claims:
CLAIMS:

1 . A plunger clamp, comprising:

a body comprising a first end, a second end, and a clamp connector disposed between the first and second ends, wherein the clamp connector comprises a threaded portion that interfaces with one or both of the first and second ends facilitating relative rotation with, and separation from, the first and second ends and the clamp connector.

2. The plunger clamp of claim 1 , wherein the clamp connector comprises a circular retainer member.

3. The plunger damp of claim 1 , wherein the clamp connector comprises segmented retainer.

4. The plunger damp of claim 1 , wherein the threaded portion comprises male threads.

5. The plunger clamp of claim 5, wherein the threaded portion comprises left handed threads and right handed threads.

6. The plunger clamp of claim 1 , wherein the clamp connector comprises left handed threads and right handed threads.

7. The plunger damp of claim 1 , wherein the damp connector comprises a split- ring collar.

8. The plunger damp of claim 1 , wherein the first and second ends include recessed portions corresponding to positions of fastener holes formed therethrough.

9. The plunger clamp of claim 1 , wherein the first end or the second end includes a plurality of blind holes formed on a perimeter thereof that extend in a direction orthogonal to a longitudinal axis of the body.

10. A plunger damp, comprising:

a body comprising a first end, a second end, and a clamp connector disposed between the first and second ends, wherein:

the damp connector comprises a threaded portion that interfaces with one or both of the first and second ends;

the clamp connector includes a plurality tool interfaces formed on a perimeter thereof that extend in a direction orthogonal to a longitudinal axis of the body; and

the first and second ends include recessed portions corresponding to positions of fastener holes formed therethrough.

1 1 . The plunger clamp of claim 10, wherein the clamp connector comprises a circular retainer member.

12. The plunger clamp of claim 10, wherein the clamp connector comprises segmented retainer.

13. The plunger clamp of claim 10, wherein the threaded portion comprises male threads.

14. The plunger clamp of claim 13, wherein the threaded portion comprises left handed threads and right handed threads.

15. The plunger clamp of claim 10, wherein the clamp connector comprises left handed threads and right handed threads.

16. The plunger clamp of claim 10, wherein the clamp connector comprises a split-ring collar.

17. A fluid end, comprising:

a body having a plurality of bores formed therein that intersect at a junction; a plunger disposed in one of the bores; and a plunger damp coupled to the plunger, the plunger clamp comprising:

a body comprising a first end, a second end, and a damp connector disposed between the first and second ends, wherein:

the clamp connector comprises a threaded portion that interfaces with one or both of the first and second ends; and one or both of the first end and the second end, and the damp connector, includes a plurality tool interfaces formed on a perimeter thereof that extend radially inward in a direction orthogonal to a longitudinal axis of the body.

18. The fluid end of claim 17, wherein the clamp connector comprises a circular retainer member.

19. The fluid end of claim 17, wherein the clamp connector comprises segmented retainer.

20. The fluid end of claim 17, wherein the threaded portion comprises male threads.

21 . The fluid end of claim 20, wherein the threaded portion comprises left handed threads and right handed threads.

22. The fluid end of claim 17, wherein the clamp connector comprises left handed threads and right handed threads.

23. The fluid end of claim 17, wherein the clamp connector comprises a split-ring collar.

24. The fluid end of claim 17, wherein the first and second ends include recessed portions corresponding to positions of fastener holes formed therethrough.

Description:
PLUNGER CLAMP FOR FLUID END

BACKGROUND OF THE INVENTION

Field

[0001] Embodiments of the disclosure generally relate to a plunger clamp utilized in fluid ends in pressurized fluid delivery systems that transfer high volumes of fluids at extreme pressures.

Description of the Related Art

[8002] Pressurized fluid delivery systems which include fluid cylinder blocks for transferring fluids at high pressures are used in multiple industries. One example where such systems are used includes the oil and gas industry where high pressure fluid reciprocating pumps, such as multiplex plunger pumps, are commonly used. These types of pumps have a fluid end that includes valves, plungers, liners, among other components, that is driven by a power end that converts the rotation of a drive shaft to the reciprocating motion of the plunger(s) in the fluid end. The pumps facilitate pumping at rates of up to 100 bbi/minute, and are capable of creating variable pressures, e.g., between negative pressures during suction to a discharge pressure of about 1 ,000 pounds per square inch (psi), or more. A plunger clamp is used to connect a pony rod of the drive shaft to the plunger.

[0083] Conventional plunger damps are typically compact, one piece structures having a plate on both ends that facilitates coupling of the damp to the pony rod and the plunger. Each of the plates have fastener holes disposed in shallow blind cavities between the plates. The fastener holes have a bolt pattern that matches a respective bolt pattern of the pony rod and the plunger. Fasteners are inserted into shallow cavities and into the fastener holes during assembly. The fasteners should then be tightened to a specific torque value. However, the close quarters of the shallow cavities make it difficult to insert tools used to tighten and/or verify the torque value. Additionally, debris, such as sand, often packs tightly into the cavities making it even more difficult to insert and/or properly tighten the fasteners. Oftentimes a user may simply tighten the fasteners by hand, or even forego verifying the torque value due to the difficulty of coupling a torque wrench to the fasteners. This presents a major safety hazard as the improperly tightened fasteners may come loose or break during operation which results in injury to personnel and/or damage to the equipment,

[0004] Therefore, there exists a need for an improved plunger damp, SUMMA Y

[0005] in one embodiment, a plunger clamp is described that includes a body comprising a first end, a second end, and a clamp connector disposed between the first and second ends, wherein the clamp connector comprises a threaded portion that interfaces with one or both of the first and second ends facilitating relative rotation with, and separation from, the first and second ends and the clamp connector.

[0086] In another embodiment, a plunger damp is disclosed that includes a body comprising a first end, a second end, and a clamp connector disposed between the first and second ends, wherein the clamp connector comprises a threaded portion that interfaces with one or both of the first and second ends, the damp connector includes a plurality of tool interfaces formed on a perimeter thereof that extend in a direction orthogonal to a longitudinal axis of the body, and the first and second ends include recessed portions corresponding to positions of fastener holes formed therethrough.

[0087] In another embodiment, a fluid end is described that includes a body having a plurality of bores formed therein that intersect at a junction, a plunger disposed in one of the bores, and a plunger clamp coupled to the plunger. The plunger clamp comprises a body comprising a first end, a second end, and a clamp connector disposed between the first and second ends, wherein the clamp connector comprises a threaded portion that interfaces with one or both of the first and second ends, and one or both of the first end and the second end, and the clamp connector, includes a plurality tool interfaces formed on a perimeter thereof that extend radially inward in a direction orthogonal to a longitudinal axis of the body. BRIEF DESCRIPTION OF THE DRAWINGS

[8008] Having generally described the various embodiments of the disclosure, reference will now be made to the accompanying drawings.

[0009] Figure 1 is an isometric view of a fluid end.

[0010] Figure 2 is a cross-sectiona! view of the fluid end along lines 2-2 of Figure 1 .

[0011] Figure 3A is an isometric view of one embodiment of a plunger damp.

[0012] Figure 3B is an exploded isometric view of the plunger damp of Figure 3A.

[0013] Figure 3C is a section view of the plunger damp along lines 3C-3C of Figure 3A.

[0014] Figure 4 is a schematic side cross-sectional view of another embodiment of a damp connector.

[0015] Figure 5A is an isometric view of another embodiment of a plunger clamp.

[0016] Figure 5B is an exploded isometric view of the plunger clamp of Figure 5A.

[0017] Figure 5C is a section view of the plunger clamp along lines 5C-5C of Figure 5A.

[0018] Figure 6A is an isometric view of another embodiment of a plunger damp.

[0019] Figure 8B is an exploded isometric view of the plunger damp of Figure 8A.

[0020] Figure 6C is a section view of the plunger clamp along lines 6C-6C of Figure 6A.

[0021] To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements disclosed in one embodiment may be beneficially utilized on other embodiments without specific recitation.

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[8022] Figure 1 is an isometric view of a fluid end 100 having a fluid cylinder body 105. Figure 2 is a cross-sectional view of the fluid end 100 along lines 2-2 of Figure 1 . The fluid end 100 includes a plurality of bores 1 10A-1 10D (1 1 OA and 1 10D are shown Figure 2) formed in the body 105. The fluid end 100 is adapted to couple to a power end 1 12 via a pony rod 1 14. While only one pony rod is shown, the power end 1 12 may have a pony rod that couples to each of the bores 1 1 OA of the fluid end 100.

[0023] The fluid end 100 includes cover nuts 1 15 disposed in at least a portion of the bores 1 10B and 1 10C. A gauge connector 120 may be coupled to one of the bores 1 10B by a gauge connector nut 125. A discharge flange 130 may be coupled to opposing ends of the body 105 for connecting hoses with a discharge manifold (not shown). A plunger clamp 135 may be disposed between the fluid end 100 and the pony rod 1 14.

[0024] Referring to Figure 2, the internal components of the fluid end 100 will be described. A plunger 200 is shown disposed in the bore 1 10A and a valve assembly 205 having a spring 210 is shown disposed in the bore 1 10B. A suction cover seal gland 215 is shown disposed in the bore 1 10C and a valve stop 218 is shown in bore 1 10D. A valve body 222 as well as a valve seat 224 may also be disposed in the bores 1 10B and 1 10D. The body 105 may also include a discharge manifold 220 formed therein that is in selective communication with at least the bore 1 10B. The bores 1 10A-1 10D intersect within the body 105 at a junction 225,

[0025] Figures 3A-3C are various views of one embodiment of a plunger clamp 300 that may be used as the plunger clamp 135 of Figures 1 and 2. Figure 3A is an isometric view of the plunger damp 300. Figure 3B is an exploded isometric view of the plunger clamp 300 of Figure 3A. Figure 3C is a section view of the plunger clamp 300 along lines 3C-3C of Figure 3A. [8026] The plunger clamp 300 Includes a multi-piece body 302 including a first end 305 that is adapted to couple with a plunger, such as the plunger 200 shown in Figure 2. The plunger clamp 300 includes a second end 310 that is adapted to couple to a pony rod, such as the pony rod 1 14 if Figure 1 . A collar or clamp connector 315 is disposed between the first end 305 and the second end 310.

[0027] Holes 320 are formed in both of the first end 305 and the second end 310 along a longitudinal axis 322 of the body 302 for connecting to the plunger and the pony rod using fasteners (not shown), such as bolts or screws. Blind holes 325, which may comprise a tool interface, are formed in at least a portion of the body 302 along a radial direction (orthogonal to the direction of the longitudinal axis 322 of the body 302) for coupling the first end 305 to the second end 310. For example, blind holes 325 may be formed in the clamp connector 315 and at least one of the first end 305 (as shown) or the second end 310, providing an interface for a tool (not shown), such as a spanner wrench, in order to rotate the clamp connector 315 relative to the first end 305 and/or the second end 310. Other tool interfaces are contemplated, such as two or more flats formed on a perimeter of the first end 305 or the second end 310, and on a perimeter of the ciamp connector 315 for using a conventional open end wrench. In another example, grooves may be formed on a perimeter of the first end 305 or the second end 310, and on a perimeter of the clamp connector 315 in order to increase friction when using a tool, such as a chain wrench, in order to rotate the clamp connector 315 relative to the first end 305 and/or the second end 310.

[0028] As shown in Figures 3B and 3C, the first end 305 and the ciamp connector 315 includes a threaded connection 330. The threaded connection 330 allows the first end 305 to be fixed to the second end 310, or allows the first end 305 to be separated from the second end 310. in Figure 3C, the clamp connector 315 includes female threads 335 and the first end 305 includes male threads 340. The male threads 340 may be inserted into an opening 345 formed in a center of the clamp connector 315. The male threads 340 may be broken by recessed portions 350. Additionally, the second end 310 includes recessed portions 355 formed in a side thereof. The recessed portions 350, 355 correspond to positions of the openings 320 and may be utilized to provide space for a fastener (not shown), such as a fastener head or a nut. As shown in Figures 3B and 3C, a circular retainer member 360, such as a snap ring may be utilized to couple the second end 310 to the clamp connector 315, An annular groove 365 formed in the second end 310 may be used to capture the circular retainer member 360. Alternatively, the circular retainer member 360 and groove 365 may be replaced by a threaded ring (not shown) that may be attached to threads (not shown) formed on an end 370 of a hub 375 of the second end 310.

[0029] An example for coupling the plunger clamp 300 to the plunger, such as the plunger 200 and the pony rod, such as the pony rod 1 14, is as follows. The first end 305 may be disconnected from the clamp connector 315 for this exemplary coupling procedure. Likewise, the clamp connector 315 may be disconnected from the second end 310 for this exemplary coupling procedure.

[0030] Both of the first end 305 and the second end 310 may be coupled to the plunger and the pony rod, respectively, using fasteners. The fasteners can be tightened and torqued according to specifications as the first end 305 and the second end 310 are disconnected from each other as well as the threaded connection 330. Then, the clamp connector 315 may be coupled to the second end 310 by positioning the opening 345 about the hub 375, and attaching the circular retainer member 360 thereon to secure the damp connector 315 to the second end 310. The clamp connector 315 may then be rotated onto the threads 335 of the first end 305 to bring the first end 305 closer to the second end 310. The first end 305 and the damp connector 315 may be tightened using the blind holes 325, A torque value may be specified for the threaded connection 330 to ensure the threaded connection 330 does not loosen over time.

[8031] Figure 4 is a schematic side cross-sectional view of another embodiment of a clamp connector 400 that may be utilized to replace the clamp connector 315 of Figures 3A-3C. The clamp connector 400 includes a split-ring collar having a first portion 405 and a second portion 410 adapted to be coupled to each other using fasteners, such as a bolt 415 and a nut 420. The fasteners may be disposed in through-holes 425 formed in both of the first portion 405 and the second portion 410. Torque values may be specified for the bolts 415 and the nuts 420. The first portion 405 and the second portion 410 includes the blind holes 325 formed on a perimeter thereof as well as female threads 335 formed on an interior surface thereof. When the first portion 405 and the second portion 410 are coupled together, a connector body 430 is provided, which may be rotated onto the threads 335 of the first end 305 to bring the first end 305 closer to the second end 310. The blind holes 325 may be utilized to tighten the connector body 430 according to the exemplary installation procedure described above.

[8032] Figures 5A-5C are various views of another embodiment of a plunger clamp 500 that may be used as the plunger damp 135 of Figures 1 and 2. Figure 5A is an isometric view of the plunger clamp 500. Figure 5B is an exploded isometric view of the plunger damp 500 of Figure 5A. Figure 5C is a section view of the plunger clamp 500 along lines 5C-5C of Figure 5A.

[0033] The plunger clamp 500 includes a multi-piece body 502 that is similar to the plunger clamp 300 shown and described in Figures 3A-3C with the following exceptions. The plunger damp 500 includes a segmented retainer 505 (shown in Figures 3B and 3C) that in addition to the circular retainer member 360 of Figures 3B-3C.

[0034] According to this embodiment, the segmented retainer 505 includes a plurality of segments 515 that are coupled to each other using the circular retainer member 360. The segmented retainer 505 may be placed about the hub 375 of the second end 310 in segments 515, and the segments 515 may be retained be installing the circular retainer member 360 in a groove 520 formed in each of the segments 515. Each of the segments 515 of the segmented retainer 505 may include a radial wail 525 formed on each of the segments 515 and the radial walls 525 may be retained on the hub 375 by a circular band 530 formed on the hub 375. The installation of the plunger clamp 500 may be similar to the installation of the plunger clamp 300 described in Figures 3A-3C.

[0035] Figures 6A-6C are various views of another embodiment of a plunger clamp 600 that may be used as the plunger clamp 135 of Figures 1 and 2. Figure 6A is an isometric view of the plunger damp 600. Figure 6B is an exploded isometric view of the plunger clamp 600 of Figure 6A. Figure 6C is a section view of the plunger clamp 600 along lines 6C-6C of Figure 6A. [8036] The plunger damp 800 includes a multi-piece body 602 that is similar to the plunger clamp 300 shown and described in Figures 3A-3C with the following exceptions. A clamp connector 605 of the plunger damp 600 includes threaded members 610 extending from a centra! flange 615 thereof (only one threaded member 610 is shown in Figure 6A. .

[0037] As shown in Figures 8B and 6C, the threaded members 610 include threads 620 and threads 625 that are opposing the threads 620. For example, the threads 620 may be right-handed threads and the threads 625 may be left-handed threads. The threads 620 are adapted to interface with mating threads 630 provided in an opening 632 of the first end 305. Likewise, the threads 625 are adapted to interface with mating threads 635 provided in an opening 632 of the second end 310.

[0038] To couple the plunger clamp 600 to the plunger, such as the plunger 200 and the pony rod, such as the pony rod 1 14, the first end 305 may be disconnected from the clamp connector 605. Likewise, the clamp connector 605 may be disconnected from the second end 310. Both of the first end 305 and the second end 310 may be coupled to the plunger and the pony rod, respectively, using fasteners. The fasteners can be tightened and torqued according to specifications as the first end 305 and the second end 310 are disconnected from each other as well as the clamp connector 805.

[0039] The threaded connection 330 provided by the threads 620 and 830, and the threads 625 and 635 may provide a configuration such that the damp connector 605 functions as a turnbuck!e. After the connection of the first end 305 and the second end 310 to the plunger and the pony rod, respectively, the clamp connector 805 may be coupled to the first end 305 by rotating the clamp connector 805 relative to the first end 305. Simultaneously, the clamp connector 805 may be coupled to the second end 310 by rotating the clamp connector 605 relative to the second end 310. The blind holes 325 of the clamp connector 605 and/or the first end 305 may be used to tighten the clamp connector 805 to the first end 305 and the second end 310. A torque value may be specified for the threaded connection 330 to ensure the threaded connection 330 does not loosen over time. [8040] Embodiments of the plunger clamps 300, 500 and 600 as described herein easily secures a pony rod to a plunger of a fluid end with a connection that is enables proper torqueing of fasteners, which enables safer operation. The plunger clamps 300, 500 and 800 may be disassembled such that each side (the first end and the second end) can be installed without being connected to each other, which facilitates tightening of fasteners to the required torque values. The plunger clamps 300, 500 and 600 as described herein is usable on existing equipment without any additional machining or retrofitting to existing fluid ends, plungers and/or power ends. The plunger clamps 300, 500 and 600 may be installed without removal of the plunger from the fluid end which saves considerable time. The plunger clamps 300, 500 and 600 may be installed using standard tools, such as spanner wrenches or packing nut bars. The plunger clamps 300, 500 and 600 are significantly cheaper to manufacture than conventional clamps and the side that couples to the plunger (e.g., the first side 305) fits all plunger sizes. This reduces the quantity and cost of expendable parts the operator must keep in inventory as well as reducing operational and maintenance downtime.

[0041] While the foregoing is directed to embodiments of the present disclosure, other and further embodiments of the disclosure may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.