WO2000068578A1 - Vorrichtung zur umwandlung von pneumatischer energie in hydraulische energie - Google Patents
Vorrichtung zur umwandlung von pneumatischer energie in hydraulische energie Download PDFInfo
- Publication number
- WO2000068578A1 WO2000068578A1 PCT/AT2000/000119 AT0000119W WO0068578A1 WO 2000068578 A1 WO2000068578 A1 WO 2000068578A1 AT 0000119 W AT0000119 W AT 0000119W WO 0068578 A1 WO0068578 A1 WO 0068578A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pneumatic
- hydraulic
- piston
- pressure
- cylinder
- Prior art date
Links
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
- F15B11/06—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
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
- F04B9/129—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers
- F04B9/131—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers with two mechanically connected pumping members
- F04B9/135—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers with two mechanically connected pumping members reciprocating movement of the pumping members being obtained by two single-acting elastic-fluid motors, each acting in one direction
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/216—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being pneumatic-to-hydraulic converters
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
Definitions
- the present invention relates to a device for converting pneumatic energy into hydraulic energy according to the preamble of claim 1.
- Piston machines which are designed to relax the compressed air and to convey a hydraulic medium in order to supply a corresponding drive.
- the pressure of the compressed air drops continuously during a single working stroke.
- constant pressure is required in the hydraulic circuit. If, therefore, the cross-sectional area of the pistons and the mechanical transmission ratio between them are set up in such a way that the pressure force applied to the pneumatic piston is still sufficient at the end of the working stroke of the pneumatic piston to move the hydraulic piston, then the corresponding one at the beginning of the working stroke depends on the one used Pressure levels many times larger. This excess pressure is basically unusable and ultimately lost.
- circuits and devices described above are complex and yet can only increase the efficiency within certain limits, since losses also occur when pressure multipliers are used, which are caused by the differences between the pressure levels and the pressures actually present.
- the object of the present invention is to avoid these disadvantages and to provide a device of the type described above which has a high degree of efficiency with a simple structure.
- the gear arrangement Has gear ratio, which is different depending on the position of the pistons. It is essential to the present invention that the pneumatic piston and the hydraulic piston are not directly coupled to one another, but are connected by a gear arrangement which has a variable transmission ratio. This means that a displacement of the pneumatic piston by a certain distance depending on the position of the pneumatic piston causes a displacement of the hydraulic piston to a different extent.
- the transmission ratio is determined as possible so that the pressure falling during the expansion of the pneumatic medium is compensated.
- the transmission ratio decreases continuously with increasing working stroke of the pneumatic piston, it being large in the area of the top dead center of the pneumatic piston and small in the area of the bottom dead center of the pneumatic piston. In this way it can be ensured that during the entire working stroke the force exerted on the hydraulic piston via the gear arrangement is greater than the counterforce exerted on it by the hydraulic medium under the system pressure, so that the device can function continuously. On the other hand, the difference between these forces is kept as small as possible in order to minimize the losses.
- an adjusting device is provided for changing the gear ratio of the gear arrangement.
- the falling system pressure in the pneumatic circuit can also be taken into account when pneumatic medium such as compressed air is increasingly removed.
- the gear arrangement comprises a lever which is connected on the one hand to the pneumatic piston and on the other hand to the hydraulic piston.
- a particularly good adaptation to the pressure curve is possible in that the lever is connected to the pneumatic piston via a sliding guide.
- the effective lever arms that determine the transmission ratio are determined by the design of the geometry of the sliding surface.
- a roller guide can also be used, in which a rolling element, which is fastened to the piston rod, rolls on a corresponding surface on the lever.
- a rolling movement of the lever on a correspondingly shaped counter surface is also possible if the pressures that occur are mastered.
- a pneumatic piston is connected to two levers, each of which is connected to a hydraulic piston.
- the stability is particularly increased in that the levers are interlocked in the area of the sliding surfaces.
- an adjusting device which is designed as a mechanism for displacing the pivot point of the lever. det. In this W ⁇ else also adapting to the falling pressure can be easily made in the pneumatic system.
- FIG. 1 schematically shows the basic structure of the present invention
- FIG. 2 shows a diagram for explaining the pressure curve and the gear ratio in a first embodiment of the invention
- FIGS. 3 and 4 show an embodiment of the invention in a partial side section
- Fig. 5 is a view of the embodiment of Fig. 3 and 4
- Fig. 6 is a circuit diagram of a device according to the invention
- Fig. 7 is a diagram for explaining the pressure curve and the gear ratio in such an embodiment of the invention
- Fig. 8 is a schematic diagram the structure of this embodiment variant
- FIG. 9 schematically shows a further embodiment variant of the invention.
- the 1 shows a pneumatic cylinder 1 with a pneumatic piston 2 arranged movably therein.
- the pneumatic cylinder 1 is supported on a joint 3.
- the piston rod 4 of the pneumatic piston 2 is connected to a two-armed lever 6 via a joint 5.
- a hydraulic cylinder 7 with a hydraulic piston 8 movably arranged therein is supported in an analogous manner via a joint 9.
- a piston rod 10 of the hydraulic piston 8 is connected to the lever 6 via a joint 11.
- the pressure of the pneumatic medium in the pneumatic cylinder 1 exerts a force on the left lever arm 6a of the lever 6 which essentially corresponds to the product of the pressure and the cross-sectional area of the pneumatic piston 2.
- a moment is generated on the lever 6, which is supported at point 13, which corresponds to the product of this force with the effective distance a.
- the second lever arm 6b of the lever 6 is inclined relative to the imaginary extension of the lever arm 6a by an angle ⁇ which is approximately 20 ° to 30 °.
- a force is exerted on the hydraulic piston 8 in the joint 11 which corresponds to the torque described above broken by the effective length b of the lever arm 6b.
- the pressure exerted on the hydraulic medium in the hydraulic cylinder 7 corresponds to this force broken by the cross-sectional area of the hydraulic piston 8.
- Fig. 1 the lever arrangement is shown approximately in a central position. It is clear that at the beginning of the working stroke of the pneumatic piston 2 the lever arm 6b is approximately horizontal, and thus the transmission ratio i, which is proportional to b / a, is large. In the course of the working stroke of the pneumatic piston 2 from top dead center to bottom dead center, the effective length b of the lever arm 6b becomes increasingly smaller, while the effective length a is only subjected to a slight change. In the area of bottom dead center, the effective length b becomes very small, so that the transmission ratio i also becomes very small.
- the mode of operation of the invention is explained in the simplest case of a one-stage relaxation using a diagram.
- the piston is on the horizontal axis applied s of the pneumatic piston 2.
- the pressure p in the pneumatic cylinder 1 or the transmission ratio i are plotted on the vertical axis, wherein i, as explained above, is defined as a differential change in the path of the hydraulic piston 8 broken by a differential change in the position of the pneumatic piston 2.
- the upper curve drawn in solid lines in FIG. 2 is labeled 100 and represents the pressure curve in the pneumatic piston 2 during the working cycle.
- a valve (not shown) is opened and the pneumatic cylinder 1 is connected to a compressed air source which has a first working pressure p t provides.
- This connection remains in a first section of the work cycle until the pneumatic piston 2 is at a point s. Therefore, between the top dead center and s, the working pressure pl is in the pneumatic cylinder 1. In the case of a compressed air powered vehicle, this could be the maximum pressure of the pressure vessel of 300 bar.
- the connection to the pressure vessel is interrupted and the pneumatic medium is further expanded.
- the point S 1 is chosen so that the pressure p e is present in the bottom dead center UT of the pneumatic piston 2, which corresponds to a lower system pressure of, for example, 15 bar.
- the lower curve 110 drawn in solid lines represents the pressure curve when the pressure p in the pressure vessel has dropped to the pressure p 2 .
- the connection of the pneumatic cylinder 1 to the pressure vessel is maintained longer, namely up to point s 2 .
- This point is selected such that the pressure p e is also reached in the bottom dead center UT during the subsequent relaxation.
- the transmission ratio i is plotted over the path s of the pneumatic piston 2.
- the scale is chosen so that the required pressure in the hydraulic cylinder 7 is reached when the respective point on the curve 120 lies above the corresponding point on the curve 100. It can be seen from the illustration in FIG. 2 that the course of the transmission ratio i (curve 120) is adapted to the pressure course corresponding to curve 100 so that the hydraulic pressure is always reached or exceeded, but the extent of the exceeding remains limited.
- a further curve 130 for the transmission ratio i is plotted below curve 120, which curve is designed for the pressure curve in accordance with curve 110.
- This transmission ratio can be realized by displacing the pivot point 13 of the lever 6 in such a way that the lever arm 6a becomes longer and the lever arm 6b becomes shorter.
- a double-acting pneumatic cylinder la is connected as a low-pressure cylinder to two high-pressure cylinders lb and lc.
- the pneumatic cylinder la is with a piston 2a Mistake. which has a piston rod 4, via which it is connected to pistons 2b and 2c, not shown in FIG. 3.
- sliding blocks 15 are pivotally arranged.
- the sliding blocks 15 are supported on sliding surfaces 17 of two levers 16.
- a hydraulic cylinder 7 is attached to each of the levers 16.
- 3 shows the state of the device at the top dead center of the pneumatic pistons 2a, 2b, 2c. It can be seen that the effective length a on the pneumatic side is small compared to the effective length b on the hydraulic side. Therefore, the gear ratio i is large.
- 4 shows the state at the bottom dead center of the pneumatic pistons 2a, 2b, 2c.
- the sliding blocks 15 are already at the end of the sliding surface 17, so that the effective length a on the pneumatic side is large. As a result, the transmission ratio i is small.
- the characteristic shown in FIG. 2 is achieved in this way.
- the course of the transmission ratio can be optimally adapted to the respective circumstances by a corresponding curvature of the sliding surface and the other design of the geometry of the lever 16.
- an adjusting device 18 is shown with an adjusting motor 18a, with which the pivot point 13 of the lever 16 can be moved. In this way, it is possible to change the course of the transmission ratio i, for example to get from curve 120 in FIG. 2 to curve 130.
- FIG. 6 shows a basic circuit diagram for the device according to the invention.
- Compressed air is taken from a compressed air tank 20 and supplied to the pneumatic cylinders 1b and 1c and subsequently also to la via pneumatic control valves (not shown).
- the hydraulic cylinders 7 are actuated via the arrangement of the levers 16 already described above. These are connected via hydraulic lines 21 to a rectifier circuit 22, which consists of four check valves 23. Minor pressure fluctuations are collected in a high-pressure expansion tank 24 and a low-pressure expansion tank 25.
- a hydraulic working machine such as e.g. a hydraulic motor.
- Fig. 8 the circuit of the above embodiment is shown in more detail on the pneumatic side.
- Compressed air is alternately applied to first spaces 32b, 32c of the high-pressure cylinders 1b and 1c via connections 30b and 30c, which have switching valves (not shown).
- a further space 31b of the cylinder 1b behind the piston 2b communicates with the first space 32c of the high-pressure cylinder 1c via a connection (not shown) in the piston rod 4.
- the same applies to a space 31c behind the piston 2c which is only indicated in FIG. 8 and which is connected to the first space 32b of the cylinder 1b. 8 shows a position in which the movement of the pistons 2a, 2b, 2c to the right begins.
- Compressed air is introduced into the first space 32b of the cylinder 1b and flow into the space 31c of the cylinder lc via the piston rod 4. This pushes the pistons 2b and 2c to the right.
- the further space 31b of the cylinder 1b is connected to the cylinder 1a via a valve 33b which is actuated via a switching element 34b.
- there is compressed air in this space 31b which is under an average pressure of, for example, 80 bar.
- the piston 2a is pressed to the right, as a result of which an additional force is exerted on the piston rod 4.
- the cylinder 2a is designed so that its contents have a predetermined minimum pressure of, for example, 15 bar at the end of a working stroke.
- the relaxed compressed air is pushed out via valves 35b, 35c, which are actuated via switching elements 36b, 36c.
- FIG. 7 shows the force F exerted on the piston rod 4 in a diagram.
- the force F is the sum of the forces exerted on the pistons 2a, 2b, 2c, which in turn can be derived from the product of the respective cross-sectional area and the applied pressure.
- Curve 200 represents the course of the force at full storage pressure. Up to point s, the curve runs flat, since a constant pressure is present on the high-pressure side of piston 3b or 3c, as has been explained in connection with FIG. 2 . Overall, however, the force k decreases since the force exerted on the piston 2a decreases in proportion to the pressure in the cylinder la. Between point s and UT, curve 200 initially falls more steeply. The curve 210 applies to a lower outlet pressure and meets the curve 200 at the point s 2 and from there runs essentially the same to UT.
- lever 6 has a rolling surface 41 which rolls on a fixed surface 40.
- the effective lever arms can be changed so that the corresponding transmission ratios are achieved.
- the device according to the invention it is possible to convert the pressure of a pneumatic medium in a piston machine in such a way that a constant working pressure can be achieved in a corresponding hydraulic circuit. Losses can be largely avoided by optimally adapting the gear ratio and the corresponding pressures. The use of pressure multipliers and the like is not necessary. It is obvious that the device of the type described above can also be used for a multi-stage expansion of the hydraulic medium. As a result, the pressure levels can be reduced and heat can be added to the pneumatic medium between the levels in order to reduce the losses due to non-isothermal expansion.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00929009A EP1175565A1 (de) | 1999-05-06 | 2000-05-04 | Vorrichtung zur umwandlung von pneumatischer energie in hydraulische energie |
AU47234/00A AU4723400A (en) | 1999-05-06 | 2000-05-04 | Device for converting pneumatic energy into hydraulic energy |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA816/99 | 1999-05-06 | ||
AT81699A AT408023B (de) | 1999-05-06 | 1999-05-06 | Vorrichtung zur umwandlung von pneumatischer energie in hydraulische energie |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000068578A1 true WO2000068578A1 (de) | 2000-11-16 |
Family
ID=3500410
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AT2000/000119 WO2000068578A1 (de) | 1999-05-06 | 2000-05-04 | Vorrichtung zur umwandlung von pneumatischer energie in hydraulische energie |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1175565A1 (de) |
AT (1) | AT408023B (de) |
AU (1) | AU4723400A (de) |
WO (1) | WO2000068578A1 (de) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002040872A1 (fr) * | 2000-11-17 | 2002-05-23 | Nansheng Wu | Procede d'amplification dynamique |
WO2009107059A1 (en) * | 2008-02-25 | 2009-09-03 | Giancarlo Cioffi | Actuator for power transmission |
WO2009126784A2 (en) * | 2008-04-09 | 2009-10-15 | Sustainx, Inc. | Systems and methods for energy storage and recovery using compressed gas |
WO2009152141A2 (en) * | 2008-06-09 | 2009-12-17 | Sustainx, Inc. | System and method for rapid isothermal gas expansion and compression for energy storage |
CN103742352A (zh) * | 2014-01-16 | 2014-04-23 | 毛永波 | 螺杆式活塞气压转液压能源循环动力系统 |
US20150322976A1 (en) * | 2014-05-12 | 2015-11-12 | Vianney Rabhi | Travel end expansion valve for piston type pressure converter |
CN106762981A (zh) * | 2016-12-27 | 2017-05-31 | 重庆维庆液压机械有限公司 | 用于液压缸的检测装置 |
CN106762982A (zh) * | 2016-12-27 | 2017-05-31 | 重庆维庆液压机械有限公司 | 液压缸缸体的检测方法 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH63194A (de) * | 1913-01-31 | 1914-01-16 | Richard Heindl | Hydrauliche Treibvorrichtung |
DE2322284A1 (de) * | 1972-05-05 | 1973-11-22 | Inst Francais Du Petrol | Vorrichtung, um ein arbeitsfluid unter einem bestimmten druck zu halten |
DE2447799A1 (de) * | 1973-10-12 | 1975-04-17 | Edgard Jacques Maillet | Hydropneumatische oder oel-pneumatische steuervorrichtung |
US4347701A (en) * | 1980-04-03 | 1982-09-07 | Tokyo Electric Co., Ltd. | Power system for land vehicles |
GB2205369A (en) * | 1987-06-05 | 1988-12-07 | Teves Gmbh Alfred | Braking pressure modulator |
EP0711927A2 (de) * | 1994-10-11 | 1996-05-15 | Pneumatic Energy, Inc. | Pneumatischer Druckübersetzer |
WO1998017492A1 (de) * | 1996-10-18 | 1998-04-30 | Tcg Unitech Aktiengesellschaft | Antriebssystem für ein kraftfahrzeug |
EP0857877A2 (de) * | 1997-02-08 | 1998-08-12 | Mannesmann Rexroth AG | Pneumatisch-hydraulischer Wandler |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI47694B (de) * | 1970-10-21 | 1973-10-31 | Finnhydraulic Ab Oy | |
FR2266004B1 (de) * | 1974-03-27 | 1976-10-08 | Dba | |
JPS54108906A (en) * | 1978-02-14 | 1979-08-27 | Ishikawajima Harima Heavy Ind Co Ltd | Fluid pressure rotary machine |
-
1999
- 1999-05-06 AT AT81699A patent/AT408023B/de not_active IP Right Cessation
-
2000
- 2000-05-04 AU AU47234/00A patent/AU4723400A/en not_active Abandoned
- 2000-05-04 WO PCT/AT2000/000119 patent/WO2000068578A1/de not_active Application Discontinuation
- 2000-05-04 EP EP00929009A patent/EP1175565A1/de not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH63194A (de) * | 1913-01-31 | 1914-01-16 | Richard Heindl | Hydrauliche Treibvorrichtung |
DE2322284A1 (de) * | 1972-05-05 | 1973-11-22 | Inst Francais Du Petrol | Vorrichtung, um ein arbeitsfluid unter einem bestimmten druck zu halten |
DE2447799A1 (de) * | 1973-10-12 | 1975-04-17 | Edgard Jacques Maillet | Hydropneumatische oder oel-pneumatische steuervorrichtung |
US4347701A (en) * | 1980-04-03 | 1982-09-07 | Tokyo Electric Co., Ltd. | Power system for land vehicles |
GB2205369A (en) * | 1987-06-05 | 1988-12-07 | Teves Gmbh Alfred | Braking pressure modulator |
EP0711927A2 (de) * | 1994-10-11 | 1996-05-15 | Pneumatic Energy, Inc. | Pneumatischer Druckübersetzer |
WO1998017492A1 (de) * | 1996-10-18 | 1998-04-30 | Tcg Unitech Aktiengesellschaft | Antriebssystem für ein kraftfahrzeug |
EP0857877A2 (de) * | 1997-02-08 | 1998-08-12 | Mannesmann Rexroth AG | Pneumatisch-hydraulischer Wandler |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002040872A1 (fr) * | 2000-11-17 | 2002-05-23 | Nansheng Wu | Procede d'amplification dynamique |
WO2009107059A1 (en) * | 2008-02-25 | 2009-09-03 | Giancarlo Cioffi | Actuator for power transmission |
WO2009126784A2 (en) * | 2008-04-09 | 2009-10-15 | Sustainx, Inc. | Systems and methods for energy storage and recovery using compressed gas |
WO2009126784A3 (en) * | 2008-04-09 | 2009-12-03 | Sustainx, Inc. | Systems and methods for energy storage and recovery using compressed gas |
WO2009152141A2 (en) * | 2008-06-09 | 2009-12-17 | Sustainx, Inc. | System and method for rapid isothermal gas expansion and compression for energy storage |
WO2009152141A3 (en) * | 2008-06-09 | 2010-02-04 | Sustainx, Inc. | System and method for rapid isothermal gas expansion and compression for energy storage |
CN103742352A (zh) * | 2014-01-16 | 2014-04-23 | 毛永波 | 螺杆式活塞气压转液压能源循环动力系统 |
FR3020840A1 (fr) * | 2014-05-12 | 2015-11-13 | Vianney Rabhi | Detendeur de fin de course pour convertisseur de pression a pistons |
US20150322976A1 (en) * | 2014-05-12 | 2015-11-12 | Vianney Rabhi | Travel end expansion valve for piston type pressure converter |
FR3020841A1 (fr) * | 2014-05-12 | 2015-11-13 | Vianney Rabhi | Detenteur de fin de course pour convertisseur de pression a pistons |
WO2015173495A1 (fr) * | 2014-05-12 | 2015-11-19 | Vianney Rabhi | Détendeur de fin de course pour convertisseur de pression a pistons |
CN106662082A (zh) * | 2014-05-12 | 2017-05-10 | V·拉比 | 用于活塞型压力转换器的行程末端膨胀阀 |
JP2017520725A (ja) * | 2014-05-12 | 2017-07-27 | ラビー, ヴィアニーRABHI Vianney | ピストン型圧力変換用のエンドストローク拡張機 |
US9856891B2 (en) * | 2014-05-12 | 2018-01-02 | Vianney Rabhi | Travel end expansion valve for piston type pressure converter |
AU2015261366B2 (en) * | 2014-05-12 | 2018-08-23 | Vianney Rabhi | End-of-stroke expander for piston-type pressure converter |
CN106762981A (zh) * | 2016-12-27 | 2017-05-31 | 重庆维庆液压机械有限公司 | 用于液压缸的检测装置 |
CN106762982A (zh) * | 2016-12-27 | 2017-05-31 | 重庆维庆液压机械有限公司 | 液压缸缸体的检测方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1175565A1 (de) | 2002-01-30 |
AT408023B (de) | 2001-08-27 |
ATA81699A (de) | 2000-12-15 |
AU4723400A (en) | 2000-11-21 |
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