Hydrostatic system and pumping station for an oil or gas pipeline

Patent metadata

Field	Value
Publication number	US-11111908-B2
Application number	US-201716327456-A
Country	US
Kind code	B2
Filing date	Jul 24, 2017
Priority date	Aug 23, 2016
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

A hydrostatic system has a pressure source and a hydraulic motor or a consumer. An additional hydraulic motor/pump unit is furnished for controlling the volumetric flow for the consumer or the power output of the hydraulic motor.

First claim

The invention claimed is:

1. A hydrostatic system, comprising:
a hydraulic pressure source;
a first hydraulic motor having an output shaft that forms a mechanical power output of the hydrostatic system, and/or at least one consumer that is provided with pressurized hydraulic medium from said hydraulic pressure source;
a pressure line connecting one or both of said first hydraulic motor, for its own propulsion, or said at least one consumer, for pressurization, to said hydraulic pressure source;
a hydraulic motor/pump unit including an additional hydraulic motor and a hydraulic pump, propulsively connected with each other, to enable said hydraulic pump to be propelled by said additional hydraulic motor;
said additional hydraulic motor being connected to said hydraulic pressure source, for its own propulsion, in series with said first hydraulic motor and/or in series with said at least one consumer; and
said hydraulic pump having a pressure side connected to said pressure line.

2. The hydrostatic system according to claim 1 , further comprising a hydraulic reservoir, being a hydraulic tank or a hydraulic sump, and at least one charge pump for supplying said hydraulic pressure source from said hydraulic reservoir.

3. The hydrostatic system according to claim 2 , wherein said hydraulic pressure source comprises at least one pressure accumulator connected to a charge pump pressure side of said charge pump, for supplying hydraulic medium into said pressure accumulator.

4. The hydrostatic system according to claim 3 , wherein said additional hydraulic motor is connected to said hydraulic reservoir for feeding hydraulic medium from said pressure line into the hydraulic reservoir.

5. The hydrostatic system according to claim 2 , wherein said hydraulic pressure source comprises at least one pressure accumulator and a gas accumulator connected to said pressure accumulator, which is in a flow-conducting connection with a gas side of the pressure accumulator, or configured to be switched into a flow-conducting connection.

6. The hydrostatic system according to claim 5 , wherein said hydraulic pressure source comprises a plurality of pressure accumulators.

7. The hydrostatic system according to claim 2 , further comprising a suction line connecting a suction side of said hydraulic pump to said hydraulic reservoir.

8. The hydrostatic system according to claim 1 , further comprising a variably adjustable throttle valve for controlling a pressure in the pressure line connected in said pressure line on an input side or output side of said first hydraulic motor, said additional hydraulic motor and/or said at least one consumer.

9. The hydrostatic system according to claim 1 , wherein the propulsive connection between said additional hydraulic motor and said hydraulic pump is exclusively a mechanical connection.

10. The hydrostatic system according to claim 1 , wherein the propulsive connection between said additional hydraulic motor and said hydraulic pump is a rigid coupling.

11. The hydrostatic system according to claim 10 , wherein said rigid coupling is a shaft that carries impellers of said additional hydraulic motor and of said hydraulic pump and/or is torsionally rigidly connected to said impellers.

12. The hydrostatic system according to claim 1 , wherein said additional hydraulic motor is a displacement motor and/or said hydraulic pump is a variable displacement pump with a variably adjustable delivery volume per revolution.

13. The hydrostatic system according to claim 1 , further comprising a transmission gearing having a variable speed ratio connected in the propulsive connection between said additional hydraulic motor and said hydraulic pump.

14. The hydrostatic system according to claim 1 , further comprising an electric generator or electric motor-generator connected to said hydraulic motor/pump unit for energy storage, for reversible energy storage and/or for providing electrical energy.

15. The hydrostatic system according to claim 1 , wherein said additional hydraulic motor is configured for operation as a hydraulic pump with or without reversal of a flow direction of the hydraulic medium.

16. The hydrostatic system according to claim 1 , wherein said hydraulic pump is driven by a motor.

17. A pumping station for an oil or gas pipeline, the pumping station comprising:
a hydrostatic system according to claim 1 ;
at least one feed pump for conveying oil or gas through the pipeline;
at least one internal combustion engine connected to said hydrostatic system and configured for driving said at least one feed pump;
wherein said internal combustion engine is in, or configured to be switched into, a propulsive connection with the first hydraulic motor for starting up said internal combustion engine, or said internal combustion engine is a consumer that is provided with pressurized hydraulic medium from the hydraulic pump.

18. A hydrostatic system, comprising:
a hydraulic pressure source;
at least one first hydraulic motor and/or consumer acted upon by pressurized hydraulic medium;
a hydraulic motor/pump unit including an additional hydraulic motor and a hydraulic pump that are in a propulsive connection with each other, enabling said hydraulic pump to be propelled by said additional hydraulic motor;
a pressure line connecting said additional hydraulic motor to said pressure source for its own propulsion; and
said first hydraulic motor being connected to a pressure side of said hydraulic pump, for its own propulsion and/or for pressurizing the hydraulic medium for said consumer.

19. The hydrostatic system according to claim 18 , further comprising a hydraulic reservoir, being a hydraulic tank or a hydraulic sump, and at least one charge pump for supplying said hydraulic pressure source from said hydraulic reservoir.

20. The hydrostatic system according to claim 19 , wherein said hydraulic pressure source comprises at least one pressure accumulator connected to a charge pump pressure side of said charge pump, for supplying hydraulic medium into said pressure accumulator.

21. The hydrostatic system according to claim 20 , wherein said hydraulic pressure source comprises a plurality of pressure accumulators.

22. The hydrostatic system according to claim 20 , wherein said additional hydraulic motor is connected to said hydraulic reservoir for feeding hydraulic medium from said pressure line into the hydraulic reservoir.

23. The hydrostatic system according to claim 19 , wherein said hydraulic pressure source comprises at least one pressure accumulator and a gas accumulator connected to said pressure accumulator, which is in a flow-conducting connection with a gas side of the pressure accumulator, or configured to be switched into a flow-conducting connection.

24. The hydrostatic system according to claim 19 , further comprising a suction line connecting a suction side of said hydraulic pump to said hydraulic reservoir.

25. The hydrostatic system according to claim 18 , further comprising a variably adjustable throttle valve for controlling a pressure in the pressure line connected in said pressure line on an input side or output side of said first hydraulic motor, said additional hydraulic motor and/or said at least one consumer.

26. The hydrostatic system according to claim 18 , wherein the propulsive connection between said additional hydraulic motor and said hydraulic pump is exclusively a mechanic

Assignees

• Voith Patent Gmbh

Inventors

• Rommel Matthias
• Brahmer Bert

Classifications

• F02N15/022

  the starter comprising an intermediate clutch · CPC title

• F04B23/00

  Pumping installations or systems (pumps characterised by combination with, or adaptation to, specific driving engines or motors F04B17/00) · CPC title

• F04B17/05 Primary

  driven by internal-combustion engines · CPC title

• F02N7/06

  the engines being of reciprocating-piston type (of internal-combustion type F02N7/10) · CPC title

• F15B1/02

  Installations or systems with accumulators · CPC title