Mechanical drive system for a pulseless positive displacement pump

Patent metadata

Field	Value
Publication number	US-10161393-B2
Application number	US-201414579551-A
Country	US
Kind code	B2
Filing date	Dec 22, 2014
Priority date	Feb 7, 2014
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

A drive system for a pump includes a housing defining an internal pressure chamber, a working fluid disposed within and charging the internal pressure chamber, and a reciprocating member disposed within the internal pressure chamber. The reciprocating member has a pull chamber. A pull is secured within the pull chamber, and a fluid displacement member is coupled to the pull.

First claim

The invention claimed is:

1. A drive system for a pumping apparatus comprising:
a housing defining an internal pressure chamber, wherein the internal pressure chamber is configured to be filled with a working fluid;
a reciprocating member disposed within the internal pressure chamber and configured to reciprocate along a linear axis, the reciprocating member having a pull chamber extending into and integral with the reciprocating member such that the pull chamber is configured to reciprocate with the reciprocating member;
a pull at least partially disposed within the pull chamber; and
a fluid displacement member coupled to the pull, the pull extending between the fluid displacement member and the reciprocating member;
wherein the pull is retained within the pull chamber and the pull is movable relative to the pull chamber and relative to the reciprocating member along the linear axis; and
wherein the working fluid is configured to drive the fluid displacement member through a pressure stroke.

2. The drive system of claim 1 , wherein the fluid displacement member comprises a diaphragm.

3. The drive system of claim 1 , wherein the fluid displacement member comprises a pumping piston.

4. The drive system of claim 1 , wherein the reciprocating member comprises a piston.

5. The drive system of claim 4 further comprising:
a first bushing coupled between the piston and the internal pressure chamber; and
a second bushing coupled between the piston and the internal pressure chamber.

6. The drive system of claim 1 , wherein the pull chamber is configured to house the pull when a pressure of a process fluid exceeds a pressure of the working fluid.

7. The drive system of claim 1 , wherein the working fluid comprises compressed gas.

8. The drive system of claim 1 , wherein the working fluid comprises a non-compressible hydraulic fluid.

9. The drive system of claim 1 , wherein the pull connects the fluid displacement member and the reciprocating member.

10. The drive system of claim 1 , wherein the fluid displacement member is configured to drive a process fluid out of a process fluid chamber to an outlet manifold during the pumping stroke.

11. A drive system for a pumping apparatus comprising:
a housing defining an internal pressure chamber, wherein the internal pressure chamber is configured to be filled with a working fluid;
a reciprocating member disposed within the internal pressure chamber, the reciprocating member having a pull chamber extending into and integral with the reciprocating member such that the pull chamber is configured to reciprocate with the reciprocating member;
a pull at least partially disposed within the pull chamber, wherein the pull further comprises:
an attachment end coupled to the fluid displacement member;
a pull body extending from the attachment end; and
a free end disposed at an end of the pull body opposite the attachment end;
wherein the free end is retained within the pull chamber, and wherein the free end is movable within the pull chamber such that the pull is movable relative to the pull chamber and relative to the reciprocating member; and

a fluid displacement member coupled to the pull; and
wherein the working fluid is configured to drive the fluid displacement member through a pressure stroke.

12. The drive system of claim 11 , further comprising:
a face plate secured to the end of the piston;
a pull opening through the face plate, wherein the pull body extends through the pull opening and is movable relative to the face plate; and
wherein the free end further comprises a flange extending radially outward from the free end, wherein the flange is configured to engage a side of the face plate facing an interior of the piston to retain the free end within the pull chamber.

13. A drive system for a pumping apparatus comprising:
a housing defining an internal pressure chamber, wherein the internal pressure chamber is configured to be filled with a working fluid;
a reciprocating member disposed within the internal pressure chamber and configured to reciprocate along a linear axis, the reciprocating member having a first pull chamber and a second pull chamber, the first pull chamber and the second pull chamber integral with the reciprocating member such that the first pull chamber and the second pull chamber are configured to reciprocate with the reciprocating member;
a first pull at least partially disposed within the first pull chamber, wherein the first pull is configured to be movable relative to the first pull chamber and the reciprocating member along the linear axis;
a second pull at least partially disposed within the second pull chamber, wherein the second pull is configured to be movable relative to the second pull chamber and the reciprocating member along the linear axis; and
a plurality of fluid displacement members, wherein a first one of the plurality of fluid displacement members is coupled to the first pull, the first pull extending between the first fluid displacement member and the reciprocating member, and wherein a second one of the plurality of fluid displacement members is coupled to the second pull, the second pull extending between the second fluid displacement member and the reciprocating member.

14. The drive system of claim 13 , wherein the plurality of fluid displacement members comprise diaphragms.

15. The drive system of claim 13 , wherein the plurality of fluid displacement members comprise pumping pistons.

16. The drive system of claim 13 , wherein the reciprocating member comprises a piston.

17. The drive system of claim 16 further comprising:
a first bushing coupled between the piston and the internal pressure chamber; and
a second bushing coupled between the piston and the internal pressure chamber.

18. The drive system of claim 13 , wherein the first pull chamber and the second pull chamber are configured to house the first pull and the second pull, respectively, when a pressure of a process fluid exceeds a pressure of the working fluid.

19. The drive system of claim 13 , wherein the first pull connects the first displacement member and the reciprocating member, and wherein the second pull connects the second displacement member and the reciprocating member.

20. The drive system of claim 13 , wherein:
the first one of the plurality of fluid displacement members separates the internal pressure chamber from a first process fluid chamber;
the first one of the plurality of fluid displacement members is configured to drive a process fluid out of the first process fluid chamber during a pumping stroke of the first one of the plurality of fluid displacement members;
the second one of the plurality of fluid displacement members separates the internal pressure chamber from a second process fluid chamber; and
the second one of the plurality of fluid displacement members is configured to drive the process fluid out of the second process fluid chamber during a pumping stroke of the second one of the plurality of fluid displacement members.

21. A drive system for a pumping apparatus comprising:
a housing defining an internal pressure chamber, wherein the internal pressure chamber is configured to be filled with a working fluid;
a reciprocating member disposed within the internal pressure chamber, the reciprocating member having a first pull chamber and a second pull chamber, the first pull chamber and the second pull chamber integral with the reciprocating member such that the first pull chamber and the se

Assignees

• Graco Minnesota Inc

Inventors

• Hines Bradley H
• Koehn Brian W
• Earles Jeffrey A
• Scheierl Paul W
• Collins Adam K

Classifications

• F04B53/1002

  Ball valves · CPC title

• F04B9/1176

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

• F04B9/02

  the means being mechanical · CPC title

• F04B43/04 Primary

  Pumps having electric drive · CPC title

• F04B9/1376

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