NO344544B1 - Multi ratio accumulator system. - Google Patents

Multi ratio accumulator system. Download PDF

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Publication number
NO344544B1
NO344544B1 NO20181493A NO20181493A NO344544B1 NO 344544 B1 NO344544 B1 NO 344544B1 NO 20181493 A NO20181493 A NO 20181493A NO 20181493 A NO20181493 A NO 20181493A NO 344544 B1 NO344544 B1 NO 344544B1
Authority
NO
Norway
Prior art keywords
gas
piston
chamber
piston rod
gas chamber
Prior art date
Application number
NO20181493A
Other languages
Norwegian (no)
Inventor
Jo-Einar Emblemsvåg
Rune S Austbø
Original Assignee
Kongsberg Maritime CM AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kongsberg Maritime CM AS filed Critical Kongsberg Maritime CM AS
Priority to NO20181493A priority Critical patent/NO344544B1/en
Priority to PCT/NO2019/050258 priority patent/WO2020106163A1/en
Publication of NO344544B1 publication Critical patent/NO344544B1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/002—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling
    • E21B19/004—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling supporting a riser from a drilling or production platform
    • E21B19/006—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling supporting a riser from a drilling or production platform including heave compensators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/24—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with rigid separating means, e.g. pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/072—Combined pneumatic-hydraulic systems
    • F15B11/0725—Combined pneumatic-hydraulic systems with the driving energy being derived from a pneumatic system, a subsequent hydraulic system displacing or controlling the output element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/32—Accumulator separating means having multiple separating means, e.g. with an auxiliary piston sliding within a main piston, multiple membranes or combinations thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F15B2201/413—Liquid ports having multiple liquid ports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/415—Gas ports
    • F15B2201/4155—Gas ports having valve means

Landscapes

  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Debugging And Monitoring (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)

Description

Multi ratio accumulator system
Field of the invention
The present invention relates to a multi ratio accumulator system comprising an accumulator with a hydraulic fluid chamber with a first displaceable piston and at least a first gas chamber with a second displaceable piston, and the first piston of the hydraulic fluid chamber and the second piston of the first gas chamber are connected to a mutual and axially slidable piston rod.
Disclosure of the state of art
WO16133400A1 disclose a seawater assisted accumulator where the environmental pressure reinforces available hydraulic energy. The accumulator has a first piston exposed to environmental pressure on one side and low pressure on the other side, and a second piston exposed to pre-charged gas pressure on one side and hydraulic work fluid on the other side. The first piston is axially connected to the second piston with a rigid tension rod and has a larger diameter than the second piston.
US2013236272A relates to a hydraulic system for a crane with at least one hydraulic circuit, which comprises at least one hydraulic consumer, and a constant pressure network, wherein the at least one hydraulic circuit is coupled with the constant pressure network via at least one pressure reducer, whereby a higher volume flow with low pressure as compared to the constant pressure network can be generated in the hydraulic circuit.
US2013220960A relates to a heave compensated crane, comprising a lower vertical beam and an upper horizontal beam which are mutually connected via an articulated piece, as the vertical beam is connected at the bottom to a base which in turn comprises a slew ring for rotation of the crane about a vertical axis, and a strut is arranged between the base and the articulated piece at a distance from the vertical beam and largely in parallel with this in a normal position for the crane, and that the vertical beam is driven by, at least, one cylinder and the upper crane beam in its movement in relation to the lower beam is driven by an intermediate cylinder arrangement, where the cylinder arrangement comprises, at least, one single working cylinder and, at least, one double working cylinder.
WO2010017200 A2 discloses an accumulator for a subsea blowout preventer unit including a blowout preventer includes a body. The body includes a hydraulic fluid chamber and a gas chamber. The hydraulic fluid chamber has a smaller inner diameter than the gas chamber. The accumulator further includes a hydraulic fluid port in fluid communication between the hydraulic fluid chamber and the subsea blowout preventer, a hydraulic piston slidably and sealingly mounted in the hydraulic fluid chamber, and a charge piston slidably and sealingly mounted in the gas chamber. A pressure port receives pressure to provide a force on the opposite side of the charge piston from the hydraulic piston.
NO338537 B1 discloses a heave compensation system comprising at least one compensation cell arranged to be activated automatically in response to the load exceeding pre-set values, in the case of a primary heave compensation system being inactive, and the compensation cell comprising at least one first hydraulic cylinder. The invention is characterized in that said first hydraulic cylinder is operatively coupled via hydraulic lines to at least one first hydraulic accumulator and to one or more other hydraulic accumulators either in a fluid manner or through one or more hydraulic cylinders, said first hydraulic accumulator will be pre-loaded to a first predetermined pressure and said second hydraulic accumulator will be preloaded to a second predetermined pressure, the level of the first predetermined pressure being lower than the level of the second predetermined pressure.
US 2003/0037544 A1 provides a hydraulic pressure compensation system for valve actuator assemblies. The system has particular application for subsea wellhead installations. The compensation system includes at least one valve actuator assembly having a housing that retains a reciprocable piston therewithin. The piston is spring biased into its fail safe configuration. The valve actuator assembly is hydraulically associated with an accumulator reservoir that defines a closed fluid reservoir and an open fluid reservoir that is exposed to ambient pressures. The two chambers are separated by a membrane. The valve actuator assembly is also operationally associated with a fluid pressure intensifier that boosts the ambient pressure of the accumulator so that an increased fluid pressure may be transmitted to the actuator assembly to bias the actuated valve toward its fail safe configuration.
US 4761118 A discloses positive displacement reciprocating compressors of the type featuring hydraulic drive. Four coaxial bulkheads are adopted, set apart one from the next by three cylinder barrels, and three pistons which are mounted to a common rod and reciprocated thus, each in its respective barrel; the central piston and barrel are of either greater or smaller diameter than the remainder. Hydraulic oil from a power pack driving the compressor flows alternately into chambers which are occupied by the rod, and bounded at one end by one of the pistons of smaller or greater diameter.
Objects of the present invention
In an ideal accumulator system, the hydraulic fluid pressure should be continuously adapted to the pressure from the load, but which is very difficult to achieve within reason.
When conventional piston accumulator systems are set to work with a constant pressure as possible, the only possibility for changing working pressure is to change the gas pressure. With the present invention, it is possible to have two or more working pressures without changing gas pressure.
The present invention approaches optimization of the hydraulic fluid pressure by utilizing two or more ratio steps between gas pressure and hydraulic fluid pressure, by changing between different areas or spaces on the gas side.
Hence, an object of the invention is to provide a multi ratio accumulator system that can provide several different pressures on the hydraulic fluid side, without changing pressure on the gas side.
The accumulator system of the present invention will also cost less to produce compared to installing a double set of conventional accumulators having different ratios, or installing several sets of gas tanks for change of hydraulic fluid pressure.
The accumulator system according to the invention can be used together with external equipment working with hydraulic fluid. The accumulator system according to the invention can for instance be used with AHC (active heave compensation) systems.
Summary of the invention
According to the invention, a multi ratio accumulator system is provided, comprising an accumulator with a hydraulic fluid chamber with a first displaceable piston and at least a first gas chamber with a second displaceable piston, and the first piston of the hydraulic fluid chamber and the second piston of the first gas chamber are connected to a mutual and axially slidable piston rod. The hydraulic fluid chamber is divided by the first displaceable piston into a pressure side and a return side, and the first gas chamber is divided by the second displaceable piston into a piston rod side and a piston side. The piston side in the first gas chamber is via a first line connected to a gas tank supplying pressurized gas, wherein the piston rod side of the first gas chamber is via a second line connected to a first changeover valve for selective supply of pressurized gas from the gas tank or from one or more external gas sources.
The first changeover valve can be switching between being open to the gas tank or being open to atmospheric pressure.
The first gas line can be running between the piston side of the first gas chamber and the gas tank supplying pressurized gas, and the first changeover valve is connected to said first gas line and to the second gas line running to the piston rod side of the first gas chamber.
The pressure side of the hydraulic fluid chamber can be connected to a pressure line for supply of pressurized hydraulic fluid to external equipment, and the return side of the hydraulic fluid chamber can be connected to a return line for return of hydraulic fluid from the external equipment.
The accumulator according to the invention may comprise a second gas chamber, said second gas chamber is divided by a third displaceable piston into a piston rod side and a piston side.
The third displaceable piston can be connected to a second piston rod, which is mutual and axially slidable with the first piston rod.
The piston side in the second gas chamber can be connected to the gas tank supplying pressurized gas, and the piston rod side of the second gas chamber can be connected to a second changeover valve for selective supply of pressurized gas from the gas tank or from one or more external gas sources.
The second changeover valve can be switching between being open to the gas tank or being open to atmospheric pressure.
A third gas line can be running between the piston rod side of the second gas chamber and the second changeover valve, and the second changeover valve can be connected to the second gas line running from the gas tank supplying pressurized gas.
According to the invention, the accumulator may comprise a third gas chamber connected to the second gas chamber, said third gas chamber having a piston rod with a displaceable piston and a piston rod side connected to a third changeover valve and a piston side connected to the gas tank.
The accumulator system according to the invention may comprise even further subsequent gas chambers and changeover valves.
Description of the figures
Embodiments of the present invention shall now be described, by way of example only, with reference to the following figures, wherein:
Figure 1 shows a first embodiment of an accumulator system according to the invention, with a first changeover valve in a first position.
Figure 2 shows the accumulator system according to the first embodiment of the invention, with the first changeover valve in a second position.
Figure 3 shows second embodiment of an accumulator system according to the invention, with the first changeover valve in the first position and a second changeover valve in a first position.
Figure 4 shows the accumulator system according to the second embodiment of the invention, with the first changeover valve in the first position and the second changeover valve in a second position.
Figure 5 shows the accumulator system according to the second embodiment of the invention, with the first changeover valve in the second position and the second changeover valve in the first position.
Figure 6 shows the accumulator system according to the second embodiment of the invention, with the first changeover valve in the second position and the second changeover valve in the second position.
Description of preferred embodiments of the invention
A multi ratio accumulator system according to the invention comprises an accumulator 1 with a hydraulic fluid side and a gas side, such as a hydraulic fluid chamber 10 and a first gas chamber 20, and possible subsequent gas chambers 30. The hydraulic fluid can for instance be oil and the gas can for instance be nitrogen.
In a first embodiment of the invention, as shown particularly in figures 1-2, the hydraulic fluid chamber 10 and the first gas chamber 20 are combined and provides an accumulator housing with a piston rod 18 running from the hydraulic fluid chamber 10 and into the gas chamber 20. In the hydraulic fluid chamber 10, the piston rod 18 is equipped with a first piston 12 dividing the hydraulic fluid chamber 10 into a hydraulic fluid pressure side 14 (P-Oil) and a hydraulic fluid return side 16 (R-Oil). In the first gas chamber 20, the piston rod 18 is equipped with a second piston 22 dividing the first gas chamber 20 into a piston rod side 24 and a piston side 26. The piston rod 18 is mutual for both the first piston 12 and the second piston 22, and the piston rod is axially slidably in the accumulator 1.
The first gas chamber 20 may have a smaller diameter than the hydraulic fluid chamber 10. Hence, the second piston 22 in the first gas chamber 20 can have a smaller diameter than the first piston 12 in the hydraulic fluid chamber 10.
Subsequent gas chambers may have less diameter than previous gas chambers.
The accumulator system according to the invention comprises an external gas tank 3, filled with for instance nitrogen. The gas tank 3 is via a first gas line 44 connected to a port at the piston side 26 of the gas chamber 20.
The accumulator system according to the invention further comprises a first changeover valve 2. The first changeover valve 2 is connected to the first gas line 44 running from the gas tank 3, and the first changeover valve 2 is via a second gas line 46 connected to a port at the piston rod side 24 of the first gas chamber 20.
A hydraulic supply line 40 is connected to a port at the pressure side 14 of the hydraulic fluid chamber 10, and is supplying pressurized hydraulic fluid to external equipment. A hydraulic return line 42 is connected to a port at the return side 16 of the hydraulic fluid chamber 10, for return of used hydraulic fluid from the external equipment to the accumulator 1.
The first changeover valve 2 acts as a normal switchover valve, and is a valve for selecting for instance gas with atmospheric pressure 50 or gas pressure from the mutual gas source (gas tank 3) to the piston rod side 24 of the first gas chamber 20.
Figure 1 and 2 shows an embodiment with a two-step ratio using one changeover valve.
When the piston side 26 of the first gas chamber 20 is pressurized from the gas tank 3 and the piston rod side 24 of the first gas chamber 20 is open to atmospheric pressure 50, this will give a determinant ratio between active area on the hydraulic fluid side and active area on the gas side.
Figure 1 shows that the first changeover valve 2 has closed between the piston rod side 24 of the first gas chamber 20 and the gas tank 3, and that the piston rod side 24 of the first gas chamber 20 is open to atmospheric pressure 50. This will be pressure ratio one, which gives the highest hydraulic fluid pressure.
When the piston side 26 and the piston rod side 24 of the first gas chamber 20 are pressurized from the same source (gas tank 3), this will give a different ratio between active area on the hydraulic fluid side and active area on the gas side.
Figure 2 shows that the first changeover valve 2 has opened for communication between the piston rod side 24 of the first gas chamber 20 and the gas tank 3, and is closed to atmospheric pressure 50. This will be pressure ratio two, which gives the lowest hydraulic pressure.
The switching of the first changeover valve 2 will normally be done when the accumulator 1 is in position "Min", in order to minimize loss of pressurized gas to the surrounding. Figure 2 indicates "Min" and "Max" positions of the accumulator 1.
Figure 1 and 2 show two different ratios (pressure levels), i.e. that the piston rod side 24 of the first gas chamber 20 is either communicating with the gas tank 3 or to the atmospheric pressure 50. However, the first changeover valve 2 can also be connected to other gas sources, and thus provide atmospheric pressure or gas with different pressures to the piston rod side 24 of the first gas chamber 20.
In a second embodiment of the invention, as shown particularly in figures 3-6, the hydraulic fluid chamber 10, the first gas chamber 20 and a second gas chamber 30 are combined and provides an accumulator housing with a mutual piston rod 18,28 running from the hydraulic fluid chamber 10, through the first gas chamber 20 and into the second gas chamber 30.
The second embodiment comprises all features of the first embodiment, as disclosed above.
The third gas chamber 30 is connected to the piston side 26 of the first gas chamber 20 by the piston rod 28, and the third gas chamber 30 is divided into a piston rod side 34 and a piston side 36 by a piston 32 mounted to the piston rod 28. The piston rod side 34 of the third gas chamber 30 is connected to a second changeover valve 4 via a third gas line 48.
The second changeover valve 4 is connected to the first gas line 44 supplying pressurized gas from the gas tank 3.
The first gas line 44 running from the gas tank 3 is in the second embodiment of the invention connected to the piston side 26 of the first gas chamber 20, the piston side 36 of the second gas chamber 30, the first changeover valve 2 and the second changeover valve 4.
The second changeover valve 4 also acts as a normal switchover valve, and is a valve for selecting for instance gas with atmospheric pressure 50 or gas pressure from the mutual gas source (gas tank 3) to the piston rod side 34 of the second gas chamber 30.
Figure 3-6 shows an embodiment with a four-step ratio using two changeover valves.
In figure 3, both the first and second changeover valves 2,4 are closed to the gas tank 3 and open to atmospheric pressure 50. The piston side 26 of the first gas chamber 20 and the piston side 36 of the second gas chamber 30 are connected to the gas tank 3 to receive pressurized gas. This ratio provides the highest oil pressure.
The piston side 26 of the first gas chamber 20 and the piston side 36 of the second gas chamber 30 will always be connected to the gas tank 3 to receive pressurized gas.
In figure 4, the first changeover valve 2 is closed to the gas tank 3 and open to atmospheric pressure 50, while the second changeover valve 4 is open to the gas tank 3. Hence, the piston rod side 34 of the second gas chamber 30 is receiving pressurized gas from the gas tank 3, as well as the piston side 26 of the first gas chamber 20 and the piston side 36 of the second gas chamber 30. Such a ratio provides a reduced oil pressure, compared to the configuration in figure 3.
In figure 5, the second changeover valve 4 is closed to the gas tank 3 and open to atmospheric pressure 50, while the first changeover valve 2 is open to the gas tank 3. Hence, the piston rod side 24 of the first gas chamber 20 is receiving pressurized gas from the gas tank 3, as well as the piston side 26 of the first gas chamber 20 and the piston side 36 of the second gas chamber 30. Such a ratio provides a further reduced oil pressure, compared to the configuration in figure 3 and 4.
In figure 6, the first changeover valve 2 and the second changeover valve 4 are open to the gas tank 3. Hence, the piston rod side 24 of the first gas chamber 20 and the piston rod side 34 of the second gas chamber 30 are receiving pressurized gas from the gas tank 3, as well as the piston side 26 of the first gas chamber 20 and the piston side 36 of the second gas chamber 30. Such a ratio provides the lowest oil pressure, compared to the configuration in figures 3-5.
The second changeover valve 4 can also be connected to other gas sources, and thus provide atmospheric pressure or gas with different pressures to the piston rod side 34 of the second gas chamber 30.
The switching of the second changeover valve 4 will normally be done when the accumulator 1 is in position "Min", in order to minimize loss of pressurized gas to the surrounding. Figure 2 indicates "Min" and "Max" positions of the accumulator 1.

Claims (10)

Claims
1. Multi ratio accumulator system, comprising an accumulator (1) with a hydraulic fluid chamber (10) with a first displaceable piston (12) and at least a first gas chamber (20) with a second displaceable piston (22), and the first piston (12) of the hydraulic fluid chamber (10) and the second piston (22) of the first gas chamber (20) are connected to a mutual and axially slidable piston rod (18), characterized in that
said hydraulic fluid chamber (10) is divided by the first displaceable piston (12) into a pressure side (14) and a return side (16),
said first gas chamber (20) is divided by the second displaceable piston (22) into a piston rod side (24) and a piston side (26), and
the piston side (26) in the first gas chamber (20) is via a first line (44) connected to a gas tank (3) supplying pressurized gas, wherein
the piston rod side (24) of the first gas chamber (20) is via a second line (46) connected to a first changeover valve (2) for selective supply of pressurized gas from the gas tank (3) or from one or more external gas sources.
2. Accumulator system according to claim 1, wherein the first changeover valve (2) is switching between being open to the gas tank (3) or being open to atmospheric pressure (50).
3. Accumulator system according to claim 1, wherein the first gas line (44) is running between the piston side (26) of the first gas chamber (20) and the gas tank (3) supplying pressurized gas, and the first changeover valve (2) is connected to said first gas line (44) and to the second gas line (46) running to the piston rod side (24) of the first gas chamber (20).
4. Accumulator system according to claim 1, wherein the pressure side (14) of the hydraulic fluid chamber (10) is connected to a pressure line (40) for supply of pressurized hydraulic fluid to external equipment, and the return side (16) of the hydraulic fluid chamber (10) is connected to a return line (42) for return of hydraulic fluid from the external equipment.
5. Accumulator system according to claim 1, wherein said accumulator (1) comprises a second gas chamber (30), said second gas chamber (30) is divided by a third displaceable piston (32) into a piston rod side (34) and a piston side (36).
6. Accumulator system according to claim 5, wherein the third displaceable piston (32) is connected to a second piston rod (28), which is mutual and axially slidable with the first piston rod (18).
7. Accumulator system according to claim 5, wherein the piston side (36) in the second gas chamber (30) is connected to the gas tank (3) supplying pressurized gas, and the piston rod side (34) of the second gas chamber (30) is connected to a second changeover valve (4) for selective supply of pressurized gas from the gas tank (3) or from one or more external gas sources.
8. Accumulator system according to claim 7, wherein the second changeover valve (4) is switching between being open to the gas tank (3) or being open to atmospheric pressure (50).
9. Accumulator system according to claim 5, wherein a third gas line (48) is running between the piston rod side (34) of the second gas chamber (30) and the second changeover valve (4), and the second changeover valve (4) is connected to the second gas line (44) running from the gas tank (3) supplying pressurized gas.
10. Accumulator system according to claim 5-9, wherein the system comprises a third gas chamber connected to the second gas chamber (30), said third gas chamber having a piston rod with a displaceable piston and a piston rod side connected to a third changeover valve and a piston side connected to the gas tank (3).
NO20181493A 2018-11-22 2018-11-22 Multi ratio accumulator system. NO344544B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NO20181493A NO344544B1 (en) 2018-11-22 2018-11-22 Multi ratio accumulator system.
PCT/NO2019/050258 WO2020106163A1 (en) 2018-11-22 2019-11-21 Multi ratio accumulator system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO20181493A NO344544B1 (en) 2018-11-22 2018-11-22 Multi ratio accumulator system.

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WO (1) WO2020106163A1 (en)

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WO2016133400A1 (en) * 2015-02-18 2016-08-25 Optime Subsea Services As Seawater assisted accumulator

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