WO2012143614A1 - Circuit hydraulique et son procédé de fonctionnement - Google Patents

Circuit hydraulique et son procédé de fonctionnement Download PDF

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Publication number
WO2012143614A1
WO2012143614A1 PCT/FI2012/050388 FI2012050388W WO2012143614A1 WO 2012143614 A1 WO2012143614 A1 WO 2012143614A1 FI 2012050388 W FI2012050388 W FI 2012050388W WO 2012143614 A1 WO2012143614 A1 WO 2012143614A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
chamber
intensifier
plunger
pressure intensifier
Prior art date
Application number
PCT/FI2012/050388
Other languages
English (en)
Inventor
Ilari Kallio
Johan Lillhannus
Sami Jussila
Original Assignee
Wärtsilä Finland Oy
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 Wärtsilä Finland Oy filed Critical Wärtsilä Finland Oy
Priority to EP12721884.0A priority Critical patent/EP2699805B1/fr
Priority to KR1020137030707A priority patent/KR101941723B1/ko
Priority to CN201280019299.4A priority patent/CN103477088B/zh
Publication of WO2012143614A1 publication Critical patent/WO2012143614A1/fr

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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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/032—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
    • F02M57/026—Construction details of pressure amplifiers, e.g. fuel passages or check valves arranged in the intensifier piston or head, particular diameter relationships, stop members, arrangement of ports or conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/01—Absolute values
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically

Definitions

  • the present invention relates to a hydraulic system according to the preamble of claim 1.
  • the invention also concerns a method for operating a hydraulic system.
  • An object of the present invention is to provide an improved hydraulic system.
  • the characterizing features of the system according to the present invention are given in the characterizing part of claim 1.
  • Another object of the invention is to provide an improved method for operating a hydraulic system.
  • the characterizing features of the method are given in the characterizing part of the other independent claim.
  • a hydraulic system according to the present invention comprises at least a first subsystem working within a first pressure range and a second subsystem working within a second pressure range.
  • the upper limit of the second pressure range is higher than the upper limit of the first pressure range.
  • the hydraulic system further comprises a pump for supplying hydraulic fluid into the system at a first pressure level, and two pressure intensifiers for increasing the pressure in the second subsystem to a second pressure level.
  • the pressure intensifiers are piston-type pressure intensifiers with at least two alternative intensification ratios.
  • the same pump can be used for supplying hydraulic fluid into two subsystems that have different pressure requirements.
  • the maximum output pressure of the pump can be chosen according to the lower pressure requirement, which reduces the costs of the system. Due to two pressure intensifiers with alternative intensification ratios, the second subsystem can be supplied with steady flow at different pressures.
  • the method according to the present invention concerns operation of a hydraulic system, which comprises at least a first subsystem working within a first pressure range, and a second subsystem working within a second pressure range, where the upper limit of the second pressure range is higher than the upper limit of the first pressure range.
  • the method comprises at least a first operating mode comprising a first phase, in which first phase hydraulic fluid is introduced into a first chamber of a first pressure intensifier for moving a plunger of the pressure intensifier and pressurizing fluid in a second chamber of the pressure intensifier and supplying it to the second subsystem, and hydraulic fluid is introduced into a second chamber of a second pressure intensifier for moving a plunger of the pressure intensifier for emptying a first chamber and a third chamber of the pressure intensifier.
  • the first operating mode further comprises a second phase, in which second phase hydraulic fluid is introduced into the first chamber of the second pressure intensifier for moving the plunger of the pressure intensifier and pressurizing fluid in the second chamber of the pressure intensifier and supplying it to the second subsystem, and hydraulic fluid is introduced into the second chamber of the first pressure intensifier for moving the plunger of the pressure intensifier for emptying the first chamber and a third chamber of the pressure intensifier.
  • steady flow at a constant pressure can be sup- plied to the second subsystem, since one of the plungers of the two pressure intensifiers is always used for supplying fluid to the second subsystem unless the pressure intensifiers are in a by-pass mode.
  • the emptying phase of the first and third chambers can be used either for reloading the pressure intensifier or for supplying fluid from the third chamber to the second subsystem.
  • each pressure intensifier of the system comprises a plunger comprising a first pressure surface, a second pressure surface, and a third pressure surface.
  • the first pressure surface and the third pressure surface are on the same side of the plunger in the moving direction of the plunger.
  • the walls of the pressure intensifier define a first chamber with the first pressure surface, a second chamber with the second pressure surface, and a third chamber with the third pressure surface.
  • Each of the chambers is connectable to the outlet of the pump for receiving hydraulic fluid.
  • the second chamber and the third chamber are further connected to the second subsystem for supplying hydraulic fluid into it.
  • the ratio between the area of the first pressure surface and the area of the second pressure surface differs from the ratio between the area of the second pressure surface and the area of the third pressure surface two percent at most.
  • the movement of the plunger in both directions can be used to produce flow at an essentially same pressure level.
  • the ratio between the combined area of the first pressure surface and the third pressure surface and the area of the second pressure surface differs from the ratio between the area of the second pressure surface and the area of the third pressure surface two percent at most.
  • the system comprises means for opening and closing the flow communication between the pump and the first chamber of the pressure intensifier, and means for opening and closing the flow communication between the pump and the third chamber.
  • the first and second subsystems comprise components of an internal combustion engine.
  • the first subsystem comprises gas-exchange valves of the engine and the second subsystem comprises fuel injectors of the engine.
  • the pump is a variable displacement pump.
  • the method comprises a second operating mode.
  • the second operating mode comprises a first phase, in which first phase hydraulic fluid is introduced into the first chamber and the third chamber of the first pressure intensifier for moving the plunger of the pressure intensifier and pressurizing fluid in the second chamber of the pressure intensifier and supplying it to the second subsystem at a higher pressure than in the first operating mode, and hydraulic fluid is introduced into the second chamber of the second pressure intensifier for moving the plunger of the pressure intensifier for emptying the first chamber and the third chamber of the pressure intensifier.
  • the second operating mode further comprises a second phase, in which second phase hydraulic fluid is introduced into the first chamber and the third chamber of the second pressure intensifier for moving the plunger of the pressure intensifier and pressurizing fluid in the second chamber of the pressure intensifier and supplying it to the second subsystem at a higher pressure than in the first operating mode, and hydraulic fluid is introduced into the second chamber of the first pressure intensifier for moving the plunger of the pressure intensifier for emptying the first chamber and the third chamber of the pressure intensifier.
  • the third chamber in the second operating mode is emptied and filled through the same line.
  • the energy stored by the fluid in the third chamber can be recovered.
  • Fig. 1 shows a hydraulic system according to an embodiment of the invention.
  • Figs. 2a-2e show part of the system of Fig. 1 at different stages of the working cycle.
  • Fig. 3 shows a hydraulic system according to another embodiment of the invention. Detailed description of the invention
  • FIG. 1 a hydraulic system according to an embodiment of the invention.
  • the hydraulic system is used for operating fuel injectors and gas exchange valves of a large internal combustion engine, such as an engine that is used as a main or auxiliary engine of a ship or for producing electricity at a power plant.
  • the hydraulic system comprises a tank 1 for storing hydraulic fluid and a pump 2 for pressurizing the hydrau- lie fluid and supplying it into the hydraulic circuit.
  • the pump 2 is a variable displacement pump that allows adjustment of the flow.
  • the system is also provided with a first pressure accumulator 4 for reducing pressure fluctuations in the circuit and helping thus in maintaining a stable pressure in the system.
  • the gas exchange valves form a first subsystem 23 that requires a first pressure range that is 235 to 350 bar. The required flow may then be approximately 64 1/min.
  • the fuel injectors form a second subsystem 24 that requires a second pressure range that is 250 to 700 bar. The upper limit of the pressure range required by the second subsystem 24 is thus higher than the upper limit of the pressure range required by the first subsystem 23.
  • the average flow needed in the second subsystem 24 may be approximately 36 1/min.
  • the pump 2 is chosen to fulfill the pressure requirement of the first subsystem 23 and the flow requirement of the whole hydraulic system. For increasing the pressure of the hydraulic fluid that goes to the second subsystem 24, the system is provided with a first pressure intensifier 10 and a second pressure intensi- fier 10' .
  • Each pressure intensifier 10, 10' comprises a reciprocating plunger 11, I V .
  • the walls of the pressure intensifier 10, 10' and the plunger 11, 11 ' define a first cham- ber 12a, 12a', a second chamber 12b, 12b' , and a third chamber 12c, 12c' .
  • the first chamber 12a, 12a' and the third chamber 12c, 12c' are on the same side of the plunger 11, 11 ' in the moving direction of the plunger 11 , I V .
  • the second chamber 12b, 12' is on the opposite side.
  • Each chamber 12a, 12a' , 12b, 12b' , 12c, 12c' is provided with a fluid port 10a, 10a', 10b, 10b', 10c, 10c' for introducing fluid into the chamber and out of it.
  • a first pressure line 18, 18' that is provided with a first on-off valve 6, 6' connects the first chamber 12a, 12a' to the pump 2.
  • the first chamber 12a, 12a' is also connected to the tank 1 with a first return line 19, 19' that is provided with a second on-off valve 7, 7' .
  • the second chamber 12b, 12b' is connected to the pump 2 with a second pressure line 20, 20', which is provided with a first check valve 13, 13'.
  • the third chamber 12c, 12c' is connected to the pump 2 with a third pressure line 21, 2 that comprises a third on-off valve 8, 8'.
  • a third return line 22, 22' connects the third chamber 12c, 12c' to the tank 1.
  • the pressure intensifier 10, 10' also comprises a fourth chamber 12d, 12d', which is opposite to the first chamber 12a, 12a' .
  • the fourth chamber 12d, 12d' is not used for pressure intensification.
  • the fourth chamber 12d, 12d' could be provided with a pressure line, if more alternative intensification ratios were needed.
  • a leak line 17, 17' connects the fourth chamber 12d, 12d' to the tank 1.
  • a second check valve 14, 14' is arranged in the line 28, 28' leading from the second chamber 12b, 12b' to the fuel injectors and a third check valve 15, 15' is arranged in the line 29, 29' leading from the third chamber 12c, 12c' to the fuel injectors.
  • a fourth check valve 16, 16' is arranged between the third chamber 12c, 12c' and the third on-off valve 8, 8'.
  • the plunger 11, 11' has three separate pressure surfaces.
  • the first pressure surface Al, ⁇ is in contact with the fluid in the first chamber 12a, 12a' .
  • the second pressure surface A2, A2' is in contact with the fluid in the second chamber 12b, 12b', and the third pressure surface A3, A3' is in contact with the fluid in the third chamber 12c, 12c'.
  • the allowable difference depends on the applica- tion.
  • the difference between ratios A1/A2 and A2/A3 should be two percent at most, more preferably less than one percent, and most preferably less than 0.5 percent.
  • FIG 2a is shown a situation where the plunger 11 of the first pressure intensifier 10 is moving upwards, i.e. towards the second fluid port 10b.
  • the term “upwards” refers here only to the figures, the real pressure intensifier 10 can be arranged to work in any direction.
  • the pump 2 supplies at a constant pressure hydraulic fluid from the tank 1 into the hydraulic circuit. In this example, the pressure is in the range of 235 to 350 bar.
  • the first on-off valve 6 in the pressure line 18 of the first chamber 12a is open allowing flow to the pressure intensifier 10. The fluid enters the first chamber 12a of the pressure intensifier 10 through the first fluid port 10a.
  • the second on-off valve 7 that is arranged in the return line 19 of the first chamber 12a is kept closed for preventing the fluid from flowing directly into the tank 1.
  • the third on-off valve 8 in the pressure line 21 of the third chamber 12c is kept closed.
  • the fourth on-off valve 9 in the return line 22 of the third chamber 12c is open for allowing fluid being sucked from the tank 1 into the third chamber 12c to fill the void space created by the upwards motion of the plunger 11.
  • the fluid source from which the fluid is supplied into the third chamber 12c can also be other than the tank 1.
  • the source of fluid can be a fluid line connected to a lubrication pump.
  • the pressurized hydraulic fluid in the first chamber 12a pushes the plunger 11 upwards. Consequently, the pressure in the second chamber 12b increases.
  • the ratio between the pressures of the first chamber 12a and the second chamber 12b is inversely proportional to the ratio between the area of the first pressure surface Al and the area of the second pressure surface A2. In this ex- ample, the pressure is theoretically raised to a level of 341-508 bar.
  • the first check valve 13 prevents the fluid that is at higher pressure than the pressure produced by the pump 2 from flowing to the pump 2.
  • the second check valve 14 allows fluid flow to the fuel injectors.
  • Figure 2b shows a situation where the plunger 11 is moving downwards, i.e. towards the third fluid port 10c.
  • the first on-off valve 6 is closed preventing flow in the pressure line 18 of the first chamber 12a.
  • the third on-off valve 8 is closed preventing flow in the pressure line 21 of the third chamber 12c.
  • the first check valve 13 allows fluid flow through the second pressure line 20 and the second fluid port 10b into the second chamber 12b.
  • the fluid in the second chamber 12b pushes the plunger 11 downwards.
  • the second on-off valve 7 in the return line 19 of the first chamber 12a is kept open for allowing the fluid to flow freely from the first chamber 12a into the tank 1. Pressure level in the first chamber 12a is thus the same as the pressure in the tank 1, i.e.
  • the fourth on-off valve 9 in the return line 22 of the third chamber 12c is closed for preventing fluid flow from the third chamber 12c into the tank 1.
  • the fluid in the third chamber 12c thus flows through the third check valve 15 to the fuel injectors.
  • the fourth check valve 16 protects the third on-off valve 8 from the high-pressure of the pressure intensifier 10.
  • the third on-off valve 9 can thus have lower allowed maximum pressure, which reduces costs of the hydraulic system. Since the ratio between the areas of the first and second pressure surfaces Al, A2 equals the ratio between the areas of the second and third pressure surfaces A2, A3, the pressure at the fuel injectors is the same as in the situation of figure 2a.
  • the pres- sure intensifier 10 works in a medium-pressure mode. In the medium-pressure mode, the pressure intensifiers 10, 10' work as two-way intensifiers, which supply pressurized fluid to the system in their both moving directions.
  • FIG 2c is shown a situation where the plunger 11 is moving upwards.
  • both the first on-off valve 6 in the pressure line 18 of the first chamber 12a and the third on-off valve 8 in the pressure line 21 of the third chamber 12c are open. Hydraulic fluid from the pump 2 can thus flow into the first chamber 12a and the third chamber 12c.
  • the second on-off valve 7 in the return line 19 of the first chamber 12a and the fourth on-off valve 9 in the return line 22 of the third chamber 12c are closed for preventing the fluid from flowing directly into the tank 1.
  • the fluid in the first chamber 12a and the third chamber 12c pushes the plunger 11 upwards.
  • the pressure in the second chamber 12b is thus increased.
  • the pressure increase is proportional to the ratio between the combined area of the first and third pressure surfaces Al, A3 and the area of the second pressure surface A2.
  • the pressure is thus higher than in the situations of figures 2a and 2b, in this example 503-749 bar.
  • the first check valve 13 prevents flow from the second chamber 12b to the pump 2, and the fluid thus flows through the second check valve 14 to the fuel injectors.
  • Figure 2d shows a situation where the plunger 11 is moving downwards.
  • the first on- off valve 6 in the pressure line 18 of the first chamber 12a and the third on-off valve 8 in the pressure line 21 of the third chamber 12c are closed. The fluid thus flows from the pump 2 into the second chamber 12b and pushes the plunger 11 downwards.
  • the second on-off valve 7 in the return line 19 of the first chamber 12 and the fourth on-off valve 9 in the return line 22 of the third chamber are kept open, and the fluid can thus flow freely from the first chamber 12a and the third chamber 12b into the tank 1.
  • This a reloading phase in which phase the pressure intensifier 10 does not produce any pressure for the fuel injectors.
  • the operation of the pressure intensifier 10 in figures 2c and 2d form a high-pressure mode.
  • the pressure intensifiers 10, 10' work as one-way intensifiers, which supply pressurized fluid to the system in one moving direction only, and the other moving direction of the plunger 11, 11 ' is used for reloading the pressure intensifiers 10, 10'.
  • the plunger 11 is at its bottom position, i.e. at the end where the third fluid port 10c is located.
  • the first on-off valve 6 is closed for preventing flow into the first chamber 12a.
  • the third on-off valve 8 is open and would allow flow into the third chamber 12c, but since the fluid can also flow through the first check valve 13 into the second chamber 12b and the area of the second pressure surface A2 is larger than the area of the third pressure surface A3, the plunger 11 does not move upwards.
  • the fourth on-off valve 9 is closed for preventing the fluid from flowing from the pressure line 21 of the third chamber 12c through the return line 22 of the third chamber 12c into the tank 1.
  • the fluid can thus flow through two routes to the fuel injectors: through the first and second check valves 13, 14 and through the third on-off valve 8 and the fourth and third check- valves 16, 15.
  • the third on-off valve 8 could also be closed. In that case, the fluid would flow through the first and second check valves 13, 14 only.
  • the second on-off valve 7 could also be open. This is a by-pass mode where the pressure at the fuel injectors is the same as the pressure at the pump 2, providing that pressure losses in the system are ignored. If the first on-off valve 6 is not opened after the downward movement of the plunger 11, the upward movement of the plunger 11 is prevented and the pressure intensifier 10 is switched to the by-pass mode. Only the functioning of the first pressure intensifier 10 was described above.
  • the second pressure intensifier 10' works in the same manner, but it is arranged to work in a different phase than the first pressure intensifier 10' . If a medium-high pressure is needed at the fuel injectors, the pressure intensifiers 10, 10' work in the operating mode of figures 2a and 2b. When the pressure line 18 to the first chamber 12a of the first pressure intensifier 10 is open and the plunger 11 is moving upwards, the pressure lines 18' , 2 to the first and third chambers 12a', 12c' of the second pressure intensifier 10' are closed and the plunger 1 1 ' of the second pressure intensifier 10' is moving downwards. Also the return line 22' of the third chamber 12c' of the second pressure intensifier 10' is closed.
  • Both pressure intensifiers 10, 10' supply fluid to the fuel injectors at the same pressure.
  • the second pressure intensifier 10' could also be operated in the way described in figure 2d. In that case, the return line 22' of the third chamber 12c' of the second pressure intensifier 10' would be open, and the second pressure intensifier 10' would not produce any pressure for the fuel injectors.
  • the relevant valves are switched to other positions to change the moving directions of the plungers 11, I V . Because of the second pressure accumulator 5, the plungers 11, 11 ' of the first and the second pressure intensifiers 10, 10' can be in opposite phases and change their moving direction simultaneously.
  • the second pressure accumulator 5 ensures that the fluid supply to the second subsystem 24 is not interrupt- ed.
  • the pressure intensifiers 10, 10' can also be arranged to work so that the plungers 11, 11 ' do not reach their end positions at the same time. This way the interruption in fluid supply that is caused by the change of the moving directions of the plungers 11, 11 ' can be avoided.
  • the pressure intensifiers 10, 10' work in the operating mode of figures 2c and 2d.
  • the second pressure intensifier 10' When the pressure lines 18, 21 to the first and third chambers 12a, 12c of the first pressure intensifier 10 are open and the plunger 11 of the first pressure intensifier 10 is moving upwards for supplying high-pressure fluid to the fuel injectors, the second pressure intensifier 10' is in the reloading phase of figure 2d.
  • the pressure lines 18' , 2 to the first and third chambers 12a', 12c' of the second pressure intensifier 10' are thus closed and the plunger 11 ' of the second pressure intensifier 10' is moving downwards.
  • the positions of the relevant valves are switched, also the moving directions of the plungers 11, 11 ' are changed.
  • the change from the pressure supplying phase into the reloading phase can be done when the plunger 11, 11 ' reaches its end position.
  • the duration of the reloading phase is shorter than the duration of the pressure supplying phase, and therefore the plunger 11, 11 ' can be left in the by-pass mode of figure 2e after the reloading phase until the other plunger 11, 1 , which is in the pressure supplying phase, reaches its end position.
  • the pressure intensifiers 10, 10' can be provided with position sensors that are used for determining appropriate timing for switching the positions of the relevant on-off valves.
  • the plungers 11, 11 ' of the both pressure intensifi- ers 10, 10' can be operated in the by-pass mode of figure 2e.
  • a second pressure accumulator 5 is arranged upstream from the fuel injectors between the first and the second pressure intensifiers 10, 10' .
  • One purpose of the second pressure accumulator 5 is to reduce pressure fluctuations and to prevent interruptions in the fluid supply when the plungers 11, 11 ' of the pressure intensifiers 10, 10' change their moving directions.
  • the embodiment shown in figure 3 works in the same manner as the embodiment shown in figures l-2e.
  • the first pressure accumulator 4 and the pressure re- lief valve 3 are not shown, but also this embodiment could be provided with these devices.
  • the main difference between the embodiments is that in the system of figure 3, the return line 22, 22' from the third chamber 12c, 12c' is provided with a fifth check valve 25, 25' that does not allow flow into the tank 1.
  • the return line 22, 22' is thus only used for sucking fluid into the third chamber 12c, 12c' when the plunger 11, 11 ' is driven upwards by introducing fluid into the first chamber 12a. 12a' . There is thus no need for the fourth on-off valve 9, 9' .
  • the third chamber 12c, 12c' is emptied through the third pressure line 21, 21 ' .
  • An advantage of this arrangement is that the energy stored by the fluid in the third chamber 12c, 12c' is recovered. Since the third pressure line 21, 21 must allow flow in both directions, it is not provided with the fourth check valve 16, 16' between the third on-off valve 8, 8' and the pressure intensifier 10, 10' . Instead, there is a sixth check valve 26, 26' on the other side of the third on-off valve 8, 8' . A throttle valve 27, 27' is arranged in parallel with the sixth check valve 26, 26' for equalizing the flow from the pump 2 to both plungers 11, I V .
  • the functionality of the throttle valve 27, 27' prevents a situation where the majority of the pump flow is guided only to one of the plungers 11, I V .
  • the sixth check valve 26, 26' allows flow from the pump 2 to the pressure intensifier 10, 10' , but not in the other direction.
  • the third chamber 12c, 12c' is emptied during the reloading phase, the fluid flows through the throttle valve 27, 27' .
  • the pressure intensifiers 10, 10' can supply high-pressure fluid to the fuel injectors 24 during both the upward and downward movement of the plunger 11, I V .
  • Medium-pressure fluid is supplied to the fuel injectors 24 when fluid is introduced into the first chamber 12a, 12' of the pressure intensifier 10, 10' .
  • Figures 2b and 2c would thus show the high- pressure mode of the pressure intensifier 10 and figures 2a and 2d the medium-pressure mode.
  • the pressure intensifiers 10, 10' work as two-way intensifiers in the high-pressure mode and as one-way intensifiers in the medium-pressure mode.
  • the hydraulic system does not need to be used in an internal combustion engine, but it can be used for operating any hydraulic devices that require different pressure levels. It is also possible to choose the areas of the pressure surfaces differently from the way described above. It is thus possible to obtain more than two different intensification ratios.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

L'invention concerne un circuit hydraulique qui comprend un premier sous-circuit (23) fonctionnant à l'intérieur d'une première gamme de pression et un deuxième sous-circuit (24) fonctionnant à l'intérieur d'une deuxième gamme de pression dont la limite supérieure est plus élevée que la limite supérieure de la première gamme de pression. Le circuit comprend une pompe (2) pour introduire un fluide hydraulique dans le circuit et deux multiplicateurs de pression (10, 10') pour augmenter la pression dans le deuxième sous-circuit. Les multiplicateurs de pression (10, 10') sont des multiplicateurs de pression de type piston avec au moins deux rapports de multiplication alternatifs. L'invention concerne également un procédé de fonctionnement d'un circuit hydraulique.
PCT/FI2012/050388 2011-04-21 2012-04-19 Circuit hydraulique et son procédé de fonctionnement WO2012143614A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP12721884.0A EP2699805B1 (fr) 2011-04-21 2012-04-19 Circuit hydraulique et son procédé de fonctionnement
KR1020137030707A KR101941723B1 (ko) 2011-04-21 2012-04-19 유압 시스템 및 작동 방법
CN201280019299.4A CN103477088B (zh) 2011-04-21 2012-04-19 液压系统及操作方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20115392A FI20115392A0 (fi) 2011-04-21 2011-04-21 Hydraulijärjestelmä ja käyttömenetelmä
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CN110374939B (zh) * 2019-07-19 2020-05-19 南京理工军邦特种智能装备研究院有限公司 一种提供两种不同压强的液压系统及供压方法

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CN103477088B (zh) 2015-12-23
KR101941723B1 (ko) 2019-01-23
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EP2699805A1 (fr) 2014-02-26
FI20115392A0 (fi) 2011-04-21
CN103477088A (zh) 2013-12-25
KR20140034195A (ko) 2014-03-19

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