Plunger bore sleeve for a reciprocating pump

Patent metadata

Field	Value
Publication number	US-11725651-B2
Application number	US-201917043541-A
Country	US
Kind code	B2
Filing date	Apr 2, 2019
Priority date	Apr 2, 2018
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

A fluid cylinder for a fluid end section of a reciprocating pump includes a body having a pressure chamber and a plunger bore that fluidly communicates with the pressure chamber. The plunger bore includes a packing segment configured to hold packing. The fluid cylinder includes a sleeve received within the packing segment of the plunger bore. The sleeve is configured to hold a plunger within an internal passage of the sleeve such that the plunger is configured to reciprocate within the plunger bore during operation of the reciprocating pump. The fluid cylinder includes a retention mechanism secured within the plunger bore such that the retention mechanism is configured to retain the sleeve within the packing segment of the plunger bore.

First claim

What is claimed is:

1. A fluid cylinder for a fluid end section of a reciprocating pump, the fluid cylinder comprising:
a body having a pressure chamber and a plunger bore that fluidly communicates with the pressure chamber, the plunger bore comprising a packing segment configured to hold packing,
wherein the plunger bore includes a groove in an inner wall of the body;

a sleeve received within the packing segment of the plunger bore, the sleeve including an inner wall that defines an internal passage that is configured to hold a plunger,
wherein the plunger is configured to reciprocate within the internal passage of the sleeve during operation of the reciprocating pump; and

a snap ring,
wherein a body of the snap ring is separate from the sleeve,
wherein the body of the snap ring is at least partly disposed in the groove and at least partly extending radially inward into the plunger bore,
wherein the body of the snap ring abuts an outermost longitudinal end of the sleeve that faces away from the pressure chamber to retain the sleeve within the packing segment of the plunger bore, and
wherein contact between the body of the snap ring and the outermost longitudinal end of the sleeve extends from an outer wall of the sleeve that contacts the inner wall of the body to the inner wall of the sleeve,
wherein an inner diameter of the body of the snap ring is smaller than a minimum inner diameter of the sleeve at the outermost longitudinal end.

2. The fluid cylinder of claim 1 , further comprising a seal operatively connected between the sleeve and the packing segment of the plunger bore, wherein the seal is radially contacting the outer wall of the sleeve and the inner wall of the body of the fluid cylinder, wherein the seal is positioned relatively closer to a first end of the sleeve, nearest the pressure chamber, than a second end of the sleeve, opposite the first end.

3. The fluid cylinder of claim 1 , wherein the snap ring is secured within the plunger bore using at least one of an interference-fit, a press-fit, a snap-fit, a weld, an epoxy, an adhesive, a fastener, or a threaded fastener.

4. The fluid cylinder of claim 1 , wherein the outermost longitudinal end of the sleeve is tapered.

5. A fluid cylinder for a fluid end section of a reciprocating pump, comprising:
a body having a pressure chamber and a plunger bore that fluidly communicates with the pressure chamber, the plunger bore comprising a packing segment configured to hold packing,
wherein the plunger bore includes a groove in an inner wall of the body;

a sleeve received within the packing segment of the plunger bore, the sleeve being configured to hold a plunger within an internal passage of the sleeve such that the plunger is configured to reciprocate within the plunger bore during operation of the reciprocating pump;
a seal between an outer wall of the sleeve and the inner wall of the body, wherein the seal is positioned relatively closer to an innermost longitudinal end of the sleeve, that faces the pressure chamber, than an outermost longitudinal end of the sleeve, that faces away from the pressure chamber; and
a snap ring secured within the plunger bore such that the snap ring is configured to retain the sleeve within the packing segment of the plunger bore,
wherein the snap ring includes a body having a ring shape,
wherein the body of the snap ring is separate from the sleeve and abuts the outermost longitudinal end of the sleeve that faces away from the pressure chamber, wherein an inner diameter of the body of the snap ring is smaller than a minimum inner diameter of the sleeve at the outermost longitudinal end, and
wherein the body of the snap ring is at least partly disposed in the groove and at least partly extending radially inward into the plunger bore.

6. The fluid cylinder of claim 5 , wherein the sleeve is fixedly secured within the packing segment of the plunger bore at least in part by the snap ring.

7. The fluid cylinder of claim 5 , wherein the seal is radially contacting the outer wall of the sleeve and the inner wall of the body of the fluid cylinder.

8. The fluid cylinder of claim 5 , wherein the snap ring is secured within the plunger bore using at least one of an interference-fit, a press-fit, a snap-fit, a weld, an epoxy, an adhesive, a fastener, or a threaded fastener.

9. The fluid cylinder of claim 5 , wherein an inner diameter of the body of the snap ring is smaller than a minimum inner diameter of the sleeve at the outermost longitudinal end.

10. The fluid cylinder of claim 9 , wherein the outermost longitudinal end of the sleeve is tapered.

11. The fluid cylinder of claim 5 , further comprising a seal groove in the inner wall of the body, wherein at least a portion of the seal is in the seal groove.

12. The fluid cylinder of claim 11 , wherein the seal includes an o-ring and a backing that supports the o-ring.

13. The fluid cylinder of claim 5 , further comprising a seal groove in the outer wall of the sleeve, wherein at least a portion of the seal is in the seal groove.

14. The fluid cylinder of claim 5 , wherein the seal is spaced from the innermost longitudinal end of the sleeve.

15. The fluid cylinder of claim 5 , wherein the plunger bore includes a ledge that faces away from the pressure chamber, and wherein the innermost longitudinal end of the sleeve abuts the ledge.

16. The fluid cylinder of claim 15 , wherein a total length of the sleeve matches a distance from the ledge to the groove.

17. A method for installing a sleeve within a plunger bore of a fluid end section of a reciprocating pump, the method comprising:
cooling the sleeve such that the sleeve shrinks radially inward;
inserting, in a first direction, the shrunken sleeve into a packing segment of the plunger bore;
heating the shrunken sleeve with the sleeve received within the packing segment such that the sleeve expands radially outward and forms an interference fit with the packing segment,
the sleeve including an inner wall that defines an internal passage that is configured to hold a plunger; and

installing, in the first direction, a retention mechanism within the plunger bore such that the retention mechanism abuts the sleeve,
wherein the retention mechanism includes a body having a ring shape,
wherein the body of the retention mechanism abuts an outermost longitudinal end of the sleeve facing away from the first direction,
wherein the plunger bore includes a groove in an inner wall of the body,
wherein the body of the retention mechanism is at least partly disposed in the groove and at least partly extending radially inward into the plunger bore, and
wherein contact between the body of the retention mechanism and the outermost longitudinal end of the sleeve extends from an outer wall of the sleeve that contacts the inner wall of the body to the inner wall of the sleeve, wherein an inner diameter of the body of the snap ring is smaller than a minimum inner diameter of the sleeve at the outermost longitudinal end.

18. The method of claim 17 , wherein heating the shrunken sleeve comprises exposing the sleeve to ambient temperature such that the sleeve returns to ambient temperature.

19. The method of claim 17 , wherein the retention mechanism is installed within the plunger bore after the sleeve is inserted.

20. The method of claim 17 , wherein the retention mechanism comprises a snap ring.

Assignees

• Spm Oil & Gas Inc

Inventors

• Myers Jeff
• Cummings Justin Rand
• Ford Tanner Craig

Classifications

• F04B53/168 Primary

  Mounting of cylinder liners in cylinders · CPC title

• F04B1/053

  with actuating or actuated elements at the inner ends of the cylinders · CPC title

• F04B19/22

  of reciprocating-piston type · CPC title

• F04B53/02 Primary

  Packing the free space between cylinders and pistons · CPC title

• F04B53/166

  Cylinder liners · CPC title