Method and device for venting the suction side of a synthetically commutated hydraulic pump

Patent metadata

Field	Value
Publication number	US-11519398-B2
Application number	US-201916272368-A
Country	US
Kind code	B2
Filing date	Feb 11, 2019
Priority date	Feb 14, 2018
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

The invention relates to a method of venting a synthetically commutated hydraulic pump (2). The connecting fluid conduits (8, 16), connecting said synthetically commutated hydraulic pump (2) with a fluid reservoir (7) is vented at least on start-up of the synthetically commutated hydraulic pump (2), using a fluid intake device (14, 17, 20) that connects to a fixed displacement pump (3).

First claim

What is claimed is:

1. A fluid working machine arrangement, comprising a synthetically commutated hydraulic fluid working machine, having at least one working chamber with at least one actuated valve, wherein said at least one actuated valve fluidly communicates with a connecting fluid conduit, wherein said connecting fluid conduit comprises at least one venting device that is fluidly connected to a fluid intake device, wherein a high pressure line of the synthetically commutated hydraulic fluid working machine and a high pressure line of the fluid intake device are arranged in parallel, and wherein operation of the fluid intake device on start-up causes air entrapped in a low pressure line of the synthetically commutated hydraulic fluid working machine to enter a low pressure line of the fluid intake device.

2. The fluid working machine arrangement according to claim 1 , wherein said synthetically commutated hydraulic fluid working machine comprises a plurality of working chambers, wherein preferably a plurality of working chambers connect to a common connecting fluid conduit.

3. The fluid working machine arrangement according to claim 1 , wherein for at least one of said at least one working chamber said at least one actuated valve connects to a common connecting fluid conduit and/or wherein at least part of said synthetically commutated hydraulic fluid working machine is designed as a synthetically commutated hydraulic fluid pump.

4. The fluid working machine arrangement according to claim 1 , wherein said synthetically commutated hydraulic fluid working machine comprises at least one working chamber with at least two actuated valves, wherein said at least two actuated valves preferably connect to different connecting fluid conduits.

5. The fluid working machine arrangement according to claim 4 , wherein for at least two different connecting fluid conduits each of said fluid conduit comprises a venting device, wherein preferably fluid switches are used to selectively connect to said venting devices with said fluid intake device.

6. The fluid working machine arrangement according to claim 1 , wherein said at least one venting device is designed, at least in part, as a fluid orifice and/or as a check valve device and/or as a single way fluid throughput device.

7. The fluid working machine arrangement according to claim 6 , wherein said at least one fluid intake device is designed as an active fluid intake device.

8. The fluid working machine arrangement according to claim 7 , wherein said synthetically commutated fluid working machine is designed and arranged for use in an open fluid hydraulic circuit and/or in that at least said synthetically commutated fluid working machine fluidly connects to at least a fluid reservoir, either directly and/or indirectly.

9. The fluid working machine arrangement according to claim 7 , wherein said at least one fluid intake device is designed and arranged for use in an open fluid hydraulic circuit and/or in that it connects to said at least one venting device and/or to at least one alternative fluid source, in particular to a fluid reservoir.

10. The fluid working machine arrangement according to claim 9 , wherein said at least one venting device and/or the fluid connection between said at least one venting device and said fluid intake device comprises a fluid throughput restriction means and/or is designed, at least in part, as a fluid throughput restriction means, wherein said fluid throughput restriction means is preferably a fixed and/or a variable fluid throughput restriction means.

11. The fluid working machine arrangement according to claim 1 , wherein said at least one venting device is arranged at least in the vicinity of the locally highest point of the respective connecting fluid conduit.

12. The fluid working machine arrangement according to claim 1 , wherein said at least one venting device connects to said synthetically commutated hydraulic fluid working machine.

13. The fluid working machine arrangement according to claim 2 , wherein for at least one of said plurality of working chambers said at least one actuated valve connects to a common connecting fluid conduit and/or wherein at least part of said synthetically commutated hydraulic fluid working machine is designed as a synthetically commutated hydraulic fluid pump.

14. The fluid working machine arrangement according to claim 2 , wherein said synthetically commutated hydraulic fluid working machine comprises at least one working chamber with at least two actuated valves, wherein said at least two actuated valves preferably connect to different connecting fluid conduits.

15. The fluid working machine arrangement according to claim 2 , wherein said at least one venting device is designed, at least in part, as a fluid orifice and/or as a check valve device and/or as a single way fluid throughput device.

16. The fluid working machine arrangement according to claim 3 , wherein said at least one venting device is designed, at least in part, as a fluid orifice and/or as a check valve device and/or as a single way fluid throughput device.

17. The fluid working machine arrangement according to claim 4 , wherein said at least one venting device is designed, at least in part, as a fluid orifice and/or as a check valve device and/or as a single way fluid throughput device.

18. The fluid working machine arrangement according to claim 5 , wherein said at least one venting device is designed, at least in part, as a fluid orifice and/or as a check valve device and/or as a single way fluid throughput device.

19. The fluid working machine arrangement according to claim 7 , wherein said at least one fluid intake device is designed as an active fluid intake device taken from the group comprising fluid working machines, fixed displacement fluid working machines, variable displacement fluid working machines, cogwheel fluid working machines, piston fluid working machines, passive-valve fluid working machines, non-synthetically commutated fluid working machines, scroll fluid working machines, Gerotor fluid working machines, fluid pumps, fixed displacement fluid pumps, variable displacement fluid pumps, cogwheel fluid pumps, piston fluid pumps, passive valve fluid pumps, non-synthetically commutated fluid pumps, scroll fluid pumps, and Gerotor fluid pumps.

20. The fluid working machine arrangement according to claim 12 , wherein said at least one venting device connects to an interior part of said synthetically commutated hydraulic fluid working machine.

21. The fluid working machine arrangement according to claim 1 , wherein the high pressure line of the synthetically commutated hydraulic fluid working machine and the high pressure line of the fluid intake device are configured to connect to different hydraulic consumers.

22. A method of venting a synthetically commutated fluid working machine, wherein at least one connecting fluid conduit, connecting said synthetically commutated fluid working machine with a different hydraulic device, is vented at least at times of a working interval of said synthetically commutated fluid working machine, using a fluid intake device, wherein a high pressure line of the synthetically commutated fluid working machine and a high pressure line of the fluid intake device are arranged in parallel, and wherein operation of the fluid intake device on start-up causes air entrapped in a low pressure line of the synthetically commutated hydraulic fluid working machine to enter a low pressure line o

Assignees

• Danfoss Power Solutions Gmbh & Co Ohg

Inventors

• Dole Alexis
• Wadsley Luke

Classifications

• F04B53/1082

  magnetic · CPC title

• F15B11/17 Primary

  using two or more pumps · CPC title

• F15B21/044

  Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding · CPC title

• F04B23/04 Primary

  Combinations of two or more pumps · CPC title

• F04B49/22

  by means of valves (F04B49/03 takes precedence) · CPC title