Piston cartridge for piston pump

Patent metadata

Field	Value
Publication number	US-10273955-B2
Application number	US-201615352284-A
Country	US
Kind code	B2
Filing date	Nov 15, 2016
Priority date	Nov 15, 2016
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

A hydraulic piston pump includes a reciprocal piston disposed in a blind housing bore of a piston housing to generate a pumping action. To accommodate the piston, a piston cartridge is installed in each of the housing bores. The piston cartridge includes a piston sleeve having an inner sleeve periphery, a first outer sleeve periphery, and a second outer sleeve periphery. The inner sleeve periphery is configured to establish sliding contact with the piston. The first outer sleeve periphery has a first outer sleeve diameter that is larger than a second outer sleeve diameter of the second outer sleeve periphery. To seal against the blind housing bore, a liner cap having a cylindrical liner wall and an axial liner cover is disposed over the first outer sleeve periphery. The axial liner cover abuts a housing bore ceiling of the blind housing bore and can receive hydraulic fluid there through.

First claim

We claim:

1. A cryogenic pump assembly comprising:
a pump body extending along a pump axis between a pump assembly and a drive assembly;
the pump assembly including a plurality of pumping elements disposed radially around the pump axis;
the drive assembly including a piston housing having:
a plurality of housing bores disposed in a radial arrangement about the pump axis,
a plurality of pistons,
a plurality of fluid passages, and
a plurality of piston cartridges;

wherein each one of the plurality of housing bores defines a corresponding bore axis, accommodates a corresponding piston of the plurality of pistons, receives fluid from a corresponding fluid passage of the plurality of fluid passages, and has concentrically installed therein a corresponding piston cartridge of the plurality of piston cartridges;
wherein each one of the plurality of pistons is arranged to reciprocally drive a corresponding one of the plurality of pumping elements; and
wherein each one of the plurality of piston cartridges includes a piston sleeve and a liner cap, the piston sleeve having an inner sleeve periphery delineating a sleeve bore and configured to establish sliding contact with one of the plurality of pistons, the liner cap including an axial liner cover extending over the sleeve bore and a fluid aperture configured to establish fluid communication with one of the plurality of fluid passages.

2. The cryogenic pump assembly of claim 1 , wherein each of the plurality of housing bores is configured as a blind bore including a housing bore wall axially terminating at a housing bore ceiling, and the axial liner cover of the liner cap further includes an annular land to provide sealing contact with the housing bore ceiling.

3. The cryogenic pump assembly of claim 2 , wherein the piston sleeve includes a plurality of radial apertures disposed therein and axially positioned to communicate with a groove disposed in the housing bore wall.

4. The cryogenic pump assembly of claim 3 , wherein each of the plurality of fluid passages is disposed through the corresponding housing bore ceiling of the corresponding housing bore.

5. The cryogenic pump assembly of claim 4 , wherein the annular land is an inner annular land disposed circumferentially proximate to a corresponding one of the plurality of fluid passages, and the axial liner cover includes an outer annular land disposed circumferentially about the inner annular land.

6. The cryogenic pump assembly of claim 5 , wherein the piston sleeve axially extends between a first sleeve end and a second sleeve end, the first sleeve end pressing the axial liner cover adjacent the corresponding housing bore ceiling.

7. The cryogenic pump assembly of claim 6 , wherein the piston sleeve includes a first outer sleeve periphery proximate the first sleeve end and a second outer sleeve periphery proximate the second sleeve end.

8. The cryogenic pump assembly of claim 7 , wherein the first outer sleeve periphery has a first outer sleeve diameter and the second outer sleeve periphery has a second outer sleeve diameter that is larger than the first outer sleeve diameter.

9. The cryogenic pump assembly of claim 8 , wherein the liner cap includes a cylindrical liner wall extending from the axial liner cover, the cylindrical liner cover circumferentially disposed around the first outer sleeve periphery.

10. The cryogenic pump assembly of claim 9 , wherein cylindrical liner wall has an outer liner diameter corresponding to the second outer sleeve diameter.

11. The cryogenic pump assembly of claim 1 , wherein the piston sleeve is made of a relatively harder material than the liner cap such that the liner cap physically deforms between the first sleeve end and the housing bore ceiling.

12. The cryogenic pump assembly of claim 1 , wherein the piston sleeve includes a plurality of male threads disposed proximate the second sleeve end to engage corresponding female threads in each of the plurality of housing bores.

Assignees

• Caterpillar Inc

Inventors

• Bean Sunil J
• Brown Cory A

Classifications

• F04B1/12

  having cylinder axes coaxial with, or parallel or inclined to, main shaft axis · CPC title

• F04B1/122

  Details or component parts, e.g. valves, sealings or lubrication means (for machines or pumps having rotary cylinder blocks F04B1/2014) · CPC title

• F04B9/1176

  the movement of each piston in one direction being obtained by a single-acting piston liquid motor · CPC title

• F04B53/14

  Pistons, piston-rods or piston-rod connections · CPC title

• F04B53/166 Primary

  Cylinder liners · CPC title