• 专利附录
  • 专利说明
  • 权利要求
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    • 专利摘要:
    ABSTRACT Apparatus comprising a floating platform (2), a cylinder (1) connected thereto, and a piston (5)having a piston rod (6) connected to a mooring (10) at the sea floor. At least one penstock tube (13)is in fluid connection at its lower end with a lower portion of the cylinder, below the piston. Thepenstock tube being provided along the cylinder and has an opening at the upper end arranged sothat water pumped upwards in the at least one penstock tube will hit a water turbine (4) arrangedabove the cylinder. The water turbine being in connection with a generator (15). Alternatively the piston is connected to a floating platform and the cylinder is connected to a mooring at the sea floor.
    公开号:SE1650826A1
    申请号:SE1650826
    申请日:2016-06-13
    公开日:2017-12-14
    发明作者:Skjoldhammer Jan
    申请人:Novige Ab；
    IPC主号:
    专利说明:

    APPARATUS AND l/IETHOD FOR HARVESTING ENERGY FROM WAVES The present invention concerns the power take-off system to be used in a Wave Energy Converter(WEC) of the point absorber type. The floating platform/buoy/lifting device may be of several designs, shapes and sizes. We will hereafter refer to it as a floating platform.
    The tremendous forces in sea waves as a potential for extracting electrical energy, is well known.The weight of water in relation to air is 830/1, which shows that in a much lesser area, the same orbetter effect as wind power can be extracted. This also applies even as the wind velocity in average is higher than the vertical wave speed of waves.
    The best numbers for cost/efficiency of existing wave power systems are today about 80% higherthan wind power. The wave power converters that exist give an average power per unit of less than100KW. This combination explains the very moderate interest among commercial investors. Severalinvestors and developers have burnt their fingers trying to make these other systems economicallyviable. Time and time again they have been coming short because of structural and reliabilityproblems in harsh weather, complex systems with many parts rising costs, as well as fundamentallywrong theories from the start. A system giving only 100 I/IW still requires planning, installation,service hours and monitoring. A much stronger performing unit will proportionally have muchlower cost per I/IW in these aspects. This is the reason wind power units have grown from 1 I/IW rated power to 8 I/IW rated power. lt seems that the reason other wave power system can give so low power output is twofold. Firstly,many previously known systems do not have an attachment to the sea floor. Then they have tobase the power output only on gravity and Newton's Law, without the latching effect one can havewith a point absorber. The previously known point absorbers having a latching solution are toosmall, combined with complex and costly machinery, which make them economically less efficient than wind power.
    The aim is to provide a concept that will be a major achievement towards reducing C02 emissions,as it will be able to compete at large with fossil fuel costs. ln the best of worlds, this means energyproducing companies can replace even coal energy plants with this system, at similar costs, and thereby contribute on a large scale in this very important challenge for mankind.
    SUMMARY OF THE INVENTION According to a first aspect of the present invention, an apparatus for harvesting energy from waves,of the wave energy converter of the point absorber type, is provided. The apparatus comprises afloating platform, a cylinder connected thereto, and a piston having a piston rod connected to amooring at the sea floor. At least one penstock tube is in fluid connection at its lower end with alower portion of the cylinder, below the piston. The at least one penstock tube is provided along thecylinder and has an opening at the upper end arranged so that water pumped upwards in the atleast one penstock tube will hit a water turbine arranged above the cylinder and the water turbine being in connection with a generator. lt is also possible to arrange the cylinder and piston vice versa, i.e. so that a piston rod is connectedto a floating platform and a cylinder connected to a mooring at the sea floor. ln this case, at leastone penstock tube is in fluid connection at its lower end with an upper portion ofthe cylinder, abovethe piston. The at least one penstock tube being provided along the cylinder and has an opening atthe upper end arranged so that water pumped upwards in the at least one penstock tube will hit awater turbine arranged above the cylinder and the water turbine being in connection with a geHeFatOF.
    According to an embodiment the cylinder is connected via a swivel coupling to the floating platform or in the vice versa case to the mooring.
    According to an embodiment the piston is movable up and down from a middle position in thecylinder. Preferably, the cylinder has at least one opening in fluid connection with the surrounding water in an upper portion and in the lower portion thereof, respectively.
    According to an embodiment the at least one opening in fluid connection with the surrounding wateris provided with a one-way valve allowing water into the lower portion of the cylinder while the cylinder moves downwards and thus the piston moves upwards relative the cylinder.
    According to an embodiment the at least one opening in fluid connection with the surrounding water is provided with a screen or filter.
    According to an embodiment the fluid connection between the cylinder and the at least onepenstock tube comprises at least one one-way valve allowing water to flow from the cylinder to the penstock tube.
    According to an embodiment at least two penstock tubes are provided on opposite sides of thecylinder. Preferably, the upper openings of the at least two penstock tubes are provided at differentlevels so that water from at least one first opening at a first side of the water turbine will hit bucketsat the top of the water turbine and water from at least one second opening at a second side of the water turbine will hit buckets at the bottom of the water turbine, or vice versa.
    According to an embodiment the at least one penstock tube has a spear valve in its upper opening.
    Thus it is possible to regulate the water flow and pressure out ofthe upper opening ofthe penstock.
    According to an embodiment the at least one penstock tube has a pressure valve in its upper opening.
    Preferably, the valve will open at a determined pressure letting water in the penstock out. lt is preferred to have a pressure valve that is of a one-way type.
    According to an embodiment the water turbine is a Pelton turbine.
    According to an embodiment a coupling is provided between the water turbine and the generator.
    Preferably, a flywheel is provided between the water turbine and the generator.
    According to an embodiment the floating platform is at least 1 meter x 20 cm for private use. Forcommercial deployment, sizes up to 140 meters length and a lifting force of more than 2000 tons is possible with today's materials. This will be increased with time. ln short one might describe the invention as a cylinder pump where the piston rod is attached to aweight standing on the sea floor, the cylinder is attached to the floating platform, the pressurizedwater being streamed upwards to a turbine, driving a generator. The water flow is being regulatedvia check valves on the cylinder, as well as one or more nozzles facing the turbine, regulating thepressure and subsequently the speed ofthe water hitting the turbine. The pressure may range from 0 to 200 bar, ideally from 50-100 bar in the lifting phase, being reduced to zero in the 4 descending phase. lt is possible to think of it as an inverted waterfall, since it pressurizes water in apenstock/tube, on a scale similar to Hydro Power stations having a fall ranging from 50 to severalhundred meters, thereafter running a water turbine, (10 bars being about equal to 100 meters waterfall).
    As the principle will work in any size, this invention is relevant from half a meter cylinder's lengthand can actually be used in a bay outside a summer cabin. Like ways, cylinder lengths of 40 metersat 60 meters' depth or more, lifting 2000 tons, will be conceivable, too, since the principle is thesame. The attachment to the sea floor may be a weight or an arrangement drilled into the sea floor structure.
    The material in the cylinder, penstock as well as the piston, may be of several materials,composites though being of preference. One or more cylinders may be used for each floatingplatform. The cylinder may be attached to the platform either fixed or with a flexible joint, thelatter being of preference, to be able to adjust to the rolling wave movement.
    The check valves and nozzle(s) may be opened or closed with the direction of water flow and/orfixed pressure settings, but may also be controlled electrically through sensors as well as computer controlled.
    The water turbine is ideally a Pelton turbine, but the concept will also work with other waterturbines. The size ofthe turbine wheel as well as the number of buckets and the control systems,may vary. A flywheel is desirable but not required. This, as well as the size of the flywheel, dependson the generator type, grid voltage and size plus number of units installed in the same area.
    The generator and control systems will vary, depending upon the size ofthe system, the user, aswell as the grid connection. A variable speed induction generator with power converter is one relevant option.
    The piston rod is connected to the mooring weight, inside a hollow strut, by thread or a clamshellsolution, for example, which is favourable both for installation and decoupling due largermaintenance/service. There will be filters or screens around various water openings to avoid contamination ofthe system.
    According to a specific embodiment a small electrical water pump, combined with a check valve,may supply constant water supply at the highest points on the penstock(s). A supply line may runalong the penstock down to below sea level. As the spear valve and/or pressure valve at the upperopening towards the water turbine does not close completely airtight, the electrical water pump will avoid air pockets to form during return stroke.
    Depending on the floating platform layout, size and whether the cylinder is flexibly or fixedlyattached to it, a prop shaft between the water turbine and the generator (via the flywheel if present), is desirable, but not a must. The prop shaft may have a spline coupling, too.
    The platform should preferably be held in an approximate position by mooring lines and anchorson the sea floor, but will also function with the cylinder and piston rod as the only attachment. ln contrast to other existing systems, the present invention concept, combined with larger floatingplatforms, can with today's newer composite materials, give incredible average performancefigures up to 9 I/IW per unit, 90 times more than the more common systems and many times more than the best performing competition.
    The world's largest offshore wind power units, being the most economical, rages 220 meter-highand has a turbine diameter of 165 meter, giving at most an average of 3.3 I/IW output. The totalweight is about 6000 tons whereof 1900 tons is based 140 meters above sea. A system accordingto the present invention having similar performance, weighs about 1700 tons, whereof 1500 tonsconsist of a simple sea floor weight, chains and anchors. Only 220 tons comes from the platformand machinery, a fraction of a wind power plant. lnstalling the wind power unit is extremely morecomplex than the present inventive system. Since the height is so much lower than wind power,the concept will be invisible from shore at a distance of 7 km, much shorter than the 52 kmneeded for wind power to be the earth's curvature. This explains the often 30-50 km distance fromland they are normally located. Combined with the fact that the concept is so much simpler to install and remove in the future, the number of permissible locations are of a far better magnitude.
    The cost for a wind power unit this size, installed, is roughly 200 M SEK. The cost for the presentinventive system combined with a larger floating platform is estimated to be 60-35% of above mentioned wind power units, calculated in relation to cost per produced MW. The percentage cost 6 drops with increasing size. The numbers are even more favourable when compared to rated power.Running cost should at most be similar to wind power per produced MW.The above statements are made to show the importance of getting this under-way, as well as to show differences as to what else is available today.
    SHORT DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail by means of exemplifying embodiments underreferral to the drawings, in which: Fig. 1 shows an embodiment ofthe inventive apparatus, combined with a floating platform, in aview showing the platform's long side, the one facing the waves.
    Fig. 2 shows the inventive apparatus of Fig. 1, combined with the platform, in a view showing theplatform's short side.
    Fig. 3 shows an embodiment of a swivel arrangement from above.
    Fig. 4 shows an embodiment of a lower portion of a piston rod and its connection to a mooringweight.
    Fig. 5 shows an embodiment of a lower portion of a piston rod and its connection to a mooringweight, with the addition of a strut between the piston rod and the U-joint.
    Fig. 6 shows a connection to the mooring as well as the installation principle with a wire rope winch. This view is turned 90 degrees from the view of Fig. 4.
    DETAILED DESCRIPTION OF THE INVENTION All illustrations of the drawings are for the purpose of describing selected embodiments of the present invention and are not intended to limit the scope ofthe present invention.
    The present invention concerns a power take-off apparatus to be used in a Wave Energy Converter(WEC) of the point absorber type. ln Fig. 1 and 2 an embodiment is shown having a cylinder 1which is attached to a floating platform 2, either fixed, or preferably, hanging in a free swivelarrangement 3, see also Fig 3. The length of the cylinder 1 can be from V2 meter, up to more than40 meters for areas with high waves and occasional monster waves. The diameter of the cylinder 1should preferably be around 1/10-1/15 of the length, ifthe very occasional monster waves are tobe accounted for, but will work perfectly with other ratios as well. As a general rule, monster waves can be up to ten times the normal wave height, meaning in practical life that on the Atlantic 7 coastline, the available stroke length should be 15 meters in each direction, 30 meters total.Cylinder total length should then be 35-40 meters. The piston rod length will be of similar length, or more in deeper water.
    The material of the cylinder 1, piston 5, piston rod 6 and strut 8, can be of several options, such asmetal or polymer composite material comprising reinforcing fibres, for example. Sandwichcomposites are one good alternative, since it is extremely strong and thin in relation to weight,does not corrode or break down in salt water, is easy to produce in various shapes and strengths, as well as being price-worthy. Installation is also easier due to the lower weight.
    Above the cylinder 1, a water turbine 4 is mounted, preferably ofthe Pelton type or similarprinciple. The Pelton Turbine has the advantage of being able to work out of water, as well asgiving excellent performance under a relatively wide range of pressure and flow rate. The lifetimein regular hydro power stations are more than thirty years. For salt water use, a slightly differentgrade of stainless steel should be used, to avoid pitting of the buckets and other parts of the turbine 4. Otherwise an off the shelf turbine concept may be used.
    The reason for mounting the turbine 4 directly above ofthe cylinder 1, is to avoid having anyflexible tubes with a more limited lifetime and to directly use the power ofthe water pressure in order to decrease power losses.
    Inside the cylinder 1, a piston 5 is present, preferably having piston rings suitable to work with thechosen cylinder material. As the up and down strokes mostly will shift direction every 2-4 seconds,plus the speed being 0,5-1,5 meters per second, the piston rings do not have to seal perfectly. Thisbecause the volume and speed ofthe water will be little affected by a minor compression leakage.The piston 5 is connected to a piston rod 6, which slides in a bushing 7, at the lower end of thecylinder 1. The purpose ofthis bushing 7 is to keep the piston rod steady in the centre of thecylinder 1. The piston rod 6 is connected at the lower end to a hollow strut 8 or directly to theupper portion of a U-joint 29. The piston rod 6 is locked to the strut 8 or U-joint 29 with treads 31and a locking nut 30, as in figure 4 and 5, or by a clamshell concept, indicated in figure 1 and 2. lf a strut 8 and treads 31 is used, it goes inside the upper portion of the U-joint 29 as depicted in figure , see more in below description. Other solutions, as long as they can be adjusted to relevant location depths and to a U-joint, are also possible.
    The piston rod 6 or strut 8 is in turn connected to a mooring weight 10 standing on the sea floor,alternatively a screw or rod may be drilled and cemented into the sea floor rock. A flexible U-joint23 is mounted between the weight 10 and the strut 8. The principle ofthe U-joint being the same as in any socket wrench set or auto-mobile prop shaft.
    As the platform 1 moves upwards with a wave, the cylinder 1 moves with it, while the piston 5stands still. The water mass around the piston 5 also stands still. The only water that moves is thewater being compressed and squeezed out of at least one one-way valve 11 in the lower portion ofthe cylinder 1, as well as mainly horizontal refill in the upper portion ofthe cylinder 1 through atleast one opening 19. ln other words, the overwhelming majority ofthe water is standing still inrelation to the surrounding water, meaning that there will only be minor energy drawn for this work. There can be one or more one-way valves 11.
    The pressurized water will flow through the at least one one-way valve 11 into and upwards in atleast one penstock tube 13, in the shown embodiment two penstock tubes arranged on oppositesides outside the cylinder 1, parallel with the cylinder 1. lt is conceivable to arrange at least onepenstock tube 13 inside the cylinder, too, although the piston 5 must be redesigned. At least onespear valve 12 is arranged in an upper opening ofthe penstock tube 13, possibly in combinationwith a separate pressure valve, and they will open when a specific pressure is obtained. Thus thewater will flow out of the spear valves 13 at high speed, hitting the buckets of the water turbine 4,driving the turbine at an optimum speed. The spear valve, which controls the pressure and flow ofwater hitting the buckets, might have to be slightly strengthened, as the number of movementswill be higher than in regular use. A separate pressure valve just before the spear valve might be an option to relieve a standard spear valve of wear and tear.
    The water turbine 4 is connected to a generator 15. The connection may preferably be a prop shaft16. An optionalflywheel14 may be arranged between the water turbine 4 and the generator 15.
    The optimum pressure of the water coming from the penstock 13 will depend upon the size and 9 lifting force ofthe floating platform 2, the wave height and wave speed, the cylinder diameter as well as the resistance in the flywheel 14 and the generator 15.
    As the platform 2 might be moving in a different pattern than the cylinder 1, a flexible connectionto the generator 15 is needed. This is done by the prop shaft 16, having U-joints 17 in both ends ornear the ends. Preferably a sp|ine 18 is provided in the middle area. ln this way, the U-joints 17 willtake care ofthe frequent and larger movements of the waves hitting the long side of a rectangularplatform 2, while the sp|ine 18 will handle the smaller movements when waves move the platformfrom the short side. The generator 15 should preferably be placed in a lower section oftheplatform 2. lt is also possible to mount the generator 15 directly attached to the turbine, givenenough room and the extra weight accounted for. As the strain on the swivel arrangement 3 is so large due to the lift resistance, the extra weight of a generator will make a small impact.
    When the platform rises, water will need to be refilled in the upper section ofthe cylinder 1. This isdone through large openings 19 in the upper portion. To avoid fish and other sea organisms, aswell as debris floating in the ocean, filters or screens 20 are installed outside these openings. Thesize of the filters masking 20 will depend on the local area. Most likely the filter 20 will be largerthan depicted, as the depicted filter area will slow the water speed. A more cage-like deviceprovided outside the openings would thereby allow smaller holes, but still allow sufficient flow ofwater due to the increased surface size, which again will allow less fragments into the cylinder. Aone-way flapper valve is an additional option, so that there is no filter when blowing outwards.The position of the holes 19 are relatively high up in the cylinder 1. The position should be so thatmore than 95% or so of the wave heights are not affected by the holes 19. When the waves atseldom time cause the piston to go past these, efficiency is lost only in this area, while normal performance will be available below.
    When the platform 2 sinks down towards the wave trough, water must be refilled in the lowerportion of the cylinder 1. This is done by water first passing at least one filter or screen 21, thenpassing at least one check valve 22. There can be one or more check valves 22. The direction offlow is shown by small arrows in all check valves. Also here the filters 21 may be larger in size thandepicted, i.e. the total area of the screen being larger, not to slow down the water and thereby allowing smaller size masking. This means basically that as long as the masking is of less size than the spear valve opening, any debris coming into the cylinder, will be blown out through the spearvalve orifice. Most non organic pollutant of any size is normally floating on the surface or sinking tothe bottom, meaning that at typically 20-40 meters' depth, there will be mostly organicsubstances, which not will be trapped for long inside the cylinder 1 or penstock 13. The outside ofthe cylinder 1 and platform 2 may be coated by antifouling paint. The dark inside of the cylinderwill not attract much organic life to grow. Competent consultant in this field states that this will be of no problem, as the organic life is attracted to lighter areas. lt is possible to provide overpressure relief valves 24 both in the lower section of the cylinder 1, as well as in the top section ofthe penstock 13.
    The swivel arrangement 3, as depicted in Fig. 3, is ofthe same principle as in a boat compass or agyro. ln the platform 2, there is a wet room with walls 25 depicted in Fig 1. Large bolts withbearings will be installed in the walls ofthe wet room 25. These will be bolted to the frame 3Awhich then is free to swivel in one direction. Bolts and bearing 3C will be mounted between theframe 3A and the cylinder 1 as well. The bearings can be on both sides or either side of the bolt,the principle is the same. ln this way, the cylinder 1 is free to move both back and forth plus sideways.
    The wet room »vill have drainage from the water flow hitting the buckets, by an open area outsidethe cylinder 1. As some water might leak into the platform 2 from where the prop shaft goesthrough the wet room wall 25, a drainage and possšbåy a bilge pump is preferred in this area. Acircular deflector plate/disc 40 mounted directly on the prop shaft, between the pump and thewall 25, will stop most of the water splash initially. Three walls 28 in sequence with a commonlower outlet, behind the plate/disc 29, will further minimise water coming into the inside oftheplatform 2. Due to gravity and the consequent curve ofthe water spray, water splash will often hit one of the three walls.
    As the water depths in the areas relevant for installation will vary, the length of the piston rod orstrut or both needs to be variable. The location depth should preferably be more than 1.3 times the highest probable monster wave in the relevant area, as one then will avoid damaging breaking 11 waves, and the water instead will have so called deep water wave character, at the location. 50 meters or more will be a conservative figure for the Atlantic coastline. lt is preferred to have a flexible system for adjusting the length of the piston rod 6, the target beingto have the piston 5 approximately in the centre position in low waves/average wave height. Thiscan be done in several ways. One is by having a selection of different piston rod 6 lengths available,and mounting the piston rod directly into an upper portion 29 of a U-joint 23, see Fig. 4. With thisconcept, the threaded 31 lower end of the piston rod 6, goes into the upper portion 29 of the U- joint. A locknut 30 keeps the position static so as not to wear out the treads.
    A different option is to have a strut 8, as in Fig. 1, 2 and 5, in between the piston rod 6, and theupper portion 29 of the U-joint 23. With this solution one will have for instance only one or twolengths of piston rods 6, but a selection of different lengths of the strut 8. The threads 31 on thepiston rod 6 as well as in the strut 8, may be of several meters, to further adjust exactly to thedesired length. ln this option, the piston rod 6 is screwed to desired position in the strut 8, andtightened with the locknut 30. The same principle apply to the strut 8 and the upper portion 29 ofthe U-joint 23. The U-joint 23 will as a consequence be of a larger diameter in Fig. 5 than in Fig. 4.ln both options, a lower portion 32 of the U-joint 23, will be attached to the mooring weight 10 ina practical manner. All above mentioned parts will be installed before being towed to the finallocation. At location there will some small movements due to waves, but being largely helped byplacing the platform 2 with the short end towards the waves. Divers will be in contact with deckcrew to position the lower portion 32 ofthe U-joint 23, into a block 33, see Fig 6. A wire 34 mayrun through the lower portion 29, with a locking nut 35 on the end. (The nut 35 may instead betwo coned halves pressed together around the wire, then positioned in a fitting cone in the block33). The nut 35 as well as the wire 34 will be removed after installation. A guiding bracket 36, witha wire hole in it, will guide the lower portion 29 towards its final position. A manual wire ropewinch 37 will be used to pull the wire. The slight movement up and down in the waves will furtherhelp to position the parts together. The fitting between the lower portion 29 and block 33 will betight. When in approximate position a bolt 38, which is cone shaped, will be hammered in positionfor the final fixed setting. A locknut 39 will ensure that the bolt 38 stays in position. Figure 4 and 6 are respectively 90 degrees in relation to the other. 12 The above are two options for connecting and installing the system in a practical manner. Othersolutions are possible, for instance clamshell, flexible joints and pulleys. One may also omit thestrut 8 and the U-joint 23 as depicted, and instead directly integrate the upper portion 29 of the U-joint 23 in the lower part ofthe piston rod. The lower part 32 of the U-joint 23 may also be directly integrated in the block 33, so as to have less parts. The principle of the patent remains the same.
    For towing from construction site to final location, depth and drag is a consideration. One option isto transport the cylinder 1 and systems lying flat on top ofthe platform, then having a craneequipped ship lift it into place.
    Another option is to lift the cylinder for instance halfway up for transport, and then, possible withan on-board crane, lower it into position.
    A third option is to have the cylinder 1 floating in the water, at location have it installed frombelow. The Pelton Turbine may or may not be in the water as well, depending of practicality regarding connections for hydraulics and electrics.
    Electricity to run the systems can be tapped from the generator and via converter be led to abattery, supplying the systems. Alternatively, a small simple wind power unit may as well supplythe battery with sufficient power, as the periods with zero winds at sea are quite short.
    Se ln any technical system there are risks of parts failing or shearing. Besides the overpressure valves24 mentioned above, more safety components may or should be installed. These may includeexplosive cartridges or weaker points to break offthe piston rod 6 or the swivel arrangement 3 incase of piston seizing. Similar solutions could be applied to some ofthe mooring chains so as tomove the platform laterally from the location, thereby avoiding parts colliding more thannecessary in the event of a shear or parts being stuck. Likewise control features that dumps thepressure via the overpressure valves 24, either to avoid the maximum bar pressure to beexceeded, or to totally dump the pressure in case of some defined malfunctions. Warning sensorsconnected to fire suppressant systems as well as bilge pumps will be of relevance as well. Withoutlisting all options, similar conservative set- ups as in shipping and aviation is what will be needed, especially in the larger and costlier versions of this platform and power take-off concept.
    权利要求:
    Claims (1)
    [1] 1. 3 CLAll/IS . An apparatus for harvesting energy from waves, of the wave energy converter type being a point absorber, comprising a floating platform (2), a cylinder (1) connected thereto, and apiston (5) having a piston rod (6) connected to a mooring (10) at the sea floor, wherein atleast one penstock tube (13) is in fluid connection (11) at its lower end with a lower portionof the cylinder (1), below the piston (5), the at least one penstock tube (13) being providedalong the cylinder (1) and has an opening at the upper end arranged so that water pumpedupwards in the at least one penstock tube (13) will hit a water turbine (4) arranged abovethe cylinder (1), or a piston (5) connected to a floating platform (2) and a cylinder (1)connected to a mooring (10) at the sea floor, wherein at least one penstock tube (13) is influid connection at its lower end with an upper portion of the cylinder (1), above the piston(5), the at least one penstock tube (13) being provided along the cylinder (1) and has anopening at the upper end arranged so that water pumped upwards in the at least onepenstock tube (13) will hit a water turbine (4) arranged above the cylinder, the water turbine (4) being in connection with a generator (15). . The apparatus according to claim 1, wherein the cylinder (1) is connected via a swivel coupling (3) to the floating platform (2). . The apparatus according to claim 1 or 2, wherein the piston (5) is movable up and down from a middle position in the cylinder (1). . The apparatus according to claim 1, 2 or 3, wherein the cylinder (1) has at least one opening (19, 22) in fluid connection with the surrounding water in an upper portion and in the lower portion thereof. . The apparatus according to claim 4, wherein the at least one opening in fluid connection with the surrounding water is provided with a one-way valve (22) allowing water into the lowerportion of the cylinder (1) while the cylinder moves downwards and thus the piston (5) moves upwards relative the cylinder. . The apparatus according to claim 4 or 5, wherein the at least one opening (19, 22) in fluid connection with the surrounding water is provided with a screen (20, 21). . The apparatus according to any one of the preceding claims, wherein the fluid connection between the cylinder (1) and the at least one penstock tube (13) comprises at least one one- way valve (11) allowing water to flow from the cylinder to the penstock tube. lO. ll. 12. 13 14 14 . The apparatus according to any one of the preceding claims, wherein at least two penstock tubes (13) are provided on opposite sides of the cylinder (1). . The apparatus according to claim 8, wherein the upper openings ofthe at least two penstock tubes (13) are provided at different levels so that water from at least one first opening at afirst side of the water turbine (4) will hit buckets at the top of the water turbine and waterfrom at least one second opening at a second side ofthe water turbine will hit buckets at thebottom of the water turbine, or vice versa. The apparatus according to any one of the preceding claims, wherein the at least onepenstock tube (13) has a spear valve (12) in its upper opening. The apparatus according to any one of the preceding claims, wherein the at least onepenstock tube (13) has a pressure valve in its upper opening. The apparatus according to any one of the preceding claims, wherein the water turbine is a Pelton turbine. . The apparatus according to any one of the preceding claims, wherein a coupling (16) is provided between the water turbine and the generator. . The apparatus according to any one of the preceding claims, wherein a flywheel (14) is provided between the water turbine (4) and the generator (15).
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    AU2017285896A1|2019-01-31|
    WO2017217919A1|2017-12-21|
    JP2019521275A|2019-07-25|
    CN109477452B|2020-10-02|
    CA3027353A1|2017-12-21|
    PT3469208T|2020-01-29|
    RU2019100036A3|2020-08-14|
    EP3469208A1|2019-04-17|
    CN109477452A|2019-03-15|
    CL2018003568A1|2019-03-29|
    PE20190491A1|2019-04-09|
    ZA201900172B|2019-10-30|
    NZ749891A|2021-09-24|
    US10619620B2|2020-04-14|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1650826A|SE540263C2|2016-06-13|2016-06-13|Apparatus for harvesting energy from waves|SE1650826A| SE540263C2|2016-06-13|2016-06-13|Apparatus for harvesting energy from waves|
    ES17813697T| ES2769312T3|2016-06-13|2017-06-12|Apparatus for recovering energy from waves|
    RU2019100036A| RU2734379C2|2016-06-13|2017-06-12|Device for wave energy extraction|
    PT178136974T| PT3469208T|2016-06-13|2017-06-12|Apparatus for harvesting energy from waves|
    PE2018003201A| PE20190491A1|2016-06-13|2017-06-12|APPARATUS TO COLLECT ENERGY FROM THE WAVES|
    CN201780042863.7A| CN109477452B|2016-06-13|2017-06-12|Device for collecting energy from waves|
    JP2018564886A| JP2019521275A|2016-06-13|2017-06-12|A device that gets energy from waves|
    PCT/SE2017/050623| WO2017217919A1|2016-06-13|2017-06-12|Apparatus for harvesting energy from waves|
    CA3027353A| CA3027353A1|2016-06-13|2017-06-12|Wave energy converter with penstock tube and nozzles|
    EP17813697.4A| EP3469208B1|2016-06-13|2017-06-12|Apparatus for harvesting energy from waves|
    AU2017285896A| AU2017285896A1|2016-06-13|2017-06-12|Apparatus for harvesting energy from waves|
    NZ749891A| NZ749891B2|2016-06-13|2017-06-12|Apparatus for harvesting energy from waves|
    CL2018003568A| CL2018003568A1|2016-06-13|2018-12-11|Apparatus for collecting energy from the waves.|
    US16/218,510| US10619620B2|2016-06-13|2018-12-13|Apparatus for harvesting energy from waves|
    ZA201900172A| ZA201900172B|2016-06-13|2019-01-10|Apparatus for harvesting energy from waves|
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