• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    SUMMARY Wave energy converter (200), comprising a (201) and an acceleration tube (202) with a working cylinder (203) and a movable working piston floating body (205) therein, a mooring system and at least one energy absorbing device (207) comprising a hydraulic pump in the form of a hydraulic cylinder (212) with one-man | and an internal pump piston (213) connected to at least one piston rod (215, 220) which creates a mechanical connection between the floating body (201) and the working piston (205) in the working cylinder (203), wherein at least one float body (216) having a buoyancy force in the water mass wherein the wave energy converter (200) is operatively coupled to the working piston (205), and wherein the buoyancy of the float body (216) is adapted to retain the working piston (205) within a desired working area vertically in the working cylinder (203) when the wave energy converter (200) operates. (Figure s)
    公开号:SE1530115A1
    申请号:SE1530115
    申请日:2015-08-10
    公开日:2017-02-11
    发明作者:Alm Filip
    申请人:W4P Waves4Power Ab；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION The present invention relates to a wave energy converter comprising a floating body, an acceleration tube which hangs in and is attached to the floating body and forms a working cylinder between an upper and a lower end of the working tube. which is movable back and forth in the working cylinder, an energy conversion arrangement comprising at least one energy absorbing device which absorbs energy movements of the working piston relative to the floating body due to said wave motions, arranged to hold and a mooring system which is the wave energy converter within a desired anchoring area.
    BACKGROUND OF THE INVENTION Wave motions in oceans and large lakes are a significant source of energy that can be utilized by extracting energy from the waves using wave power generators, also called wave energy converters, which are placed or anchored in places with suitable wave conditions.
    A number of different types of wave energy converters for the extraction and conversion of wave energy into electrical energy are already known. A previously known type of wave energy converter is based on relative movement between, on the one hand, a floating body and a so-called acceleration tube attached to it and, on the other hand, a working piston which is reciprocated in the acceleration tube, the relative movement being caused by wave motions in the water mass. where the wave energy converter is anchored by means of one or more mooring lines, in order to extract wave energy. The movement of the work piston can be used to drive, for example, a pump unit, such as a double-acting hydraulic pump or single-hose pump, a hydraulic motor and / or a hydraulic turbine of an energy conversion system arranged in or adjacent to the float to generate electricity that can be transferred to an energy storage or power grid. .
    A problem that can arise with previously known wave energy converters which have an acceleration tube with a working cylinder and a reciprocating working piston in the working cylinder is that the working piston eventually slides away from the optimal working area in the working cylinder, so that the working position of the working piston is no longer centered at the working cylinder. in the longitudinal direction thereof, but is offset upwards or downwards in the acceleration tube. Such sliding or displacement of the working piston working area can lead to a reduced efficiency of the wave energy converter and also cause other operational disturbances, which is of course not desirable.
    Another problem with previously known wave energy converters with acceleration tubes and a hydraulic pump driven by the reciprocating motion of the work piston relative to the acceleration tube has been shown to be an outgrowth of barnacles and other marine organisms if a single piston rod of the hydraulic pump is extended and exposed to water. the wave energy converter does not work, e.g. in case of weak winds or other outages. Such growth of e.g. sea urchins on a piston rod are desirable, as the growth can lead to malfunctions of the wave energy converter and is also difficult and time consuming to remove. Another problem with prior art wave energy converters can give rise to a risk of leakage of hydraulic fluid to the body of water in which the wave energy converter is located, both in the event of breakdowns and in connection with service or replacement of various components of the hydraulic pump and / or hydraulic system. Such leakage of hydraulic fluid is of course not desirable.
    Additional problems solved by the present invention will become apparent from the following description.
    SUMMARY OF THE INVENTION A first object of the present invention is to provide single-wave energy converters with acceleration tubes where the risk of the working area of the reciprocating working piston in the acceleration tube being gradually displaced from its optimum position has been considerably reduced.
    This first object is achieved with a wave energy converter according to claim 1, which comprises a floating body, an acceleration tube which hangs in and is attached to the floating body and has an upper end adjacent the floating body and a lower end spaced from the floating body, a section of the accelerating tube forming a working cylinder the upper end and the lower end, upper and lower openings of the acceleration tube to allow substantially unobstructed water flow between the working cylinder and a body of water in which the acceleration tube is at least partially immersed when the wave energy converter operates due to wave motions, a working piston and a reciprocating piston energy conversion means at least one energy absorbing device which absorbs the movements of the energy working piston relative to the floating body as a result of said wave movements and a mooring system which is arranged to hold the wave energy converter within a desired anchoring area and comprises at least a fastening device mounted on the wave energy converter for fixing a mooring line to the wave energy converter, the energy absorbing device comprising a hydraulic pump in the form of a hydraulic cylinder with a jacket and an internal pump piston connected to at least one piston rod. a buoyancy force in the body of water where the wave energy converter works is connected to the working piston, and wherein the buoyancy force of the float body is adapted to keep the working piston within a desired working area vertically in the working cylinder when the wave energy converter works.
    By providing such a float body, preferably on a piston rod below or in the vicinity of the pump piston of the hydraulic pump, the advantage is achieved that the average position of the working piston in vertical direction in the acceleration tube is communicated and will be controlled by the mean water surface of the water mass. an effective method prevents the working area of the work piston from slipping away or being displaced from the optimum position in the acceleration tube.
    A second object of the present invention is to provide single-wave energy converters with acceleration tubes and a hydraulic pump where the risk of pre-growth of barnacles and other marine organisms on a piston rod of the hydraulic pump has been considerably reduced.
    This second object is achieved with a wave energy converter according to claim 4, in which the hydraulic cylinder of the hydraulic pump has a piston rod connected to the internal pump piston which via an opening with enclosing sealing means is intended to move back and forth between a partially hydraulic cylinder and a partially shielded hydraulic cylinder. and exposed position when the wave energy converter operates, and wherein the piston rod interconnected with the internal pump piston is arranged to have in the partially extended and exposed position an exposed part which under normal conditions is above the average water surface of the water mass in which the acceleration tube is at least partially submerged.
    Because the piston rod of the hydraulic cylinder, at least in light winds or still winds and relatively small wave motions of the water mass, will exhibit an exposed part which is above the water surface when the piston rod is in the partially extended and exposed position, the living conditions will grow on marine tulips. and the risk of growth of such marine organisms is significantly reduced.
    A third object of the present invention is to provide single-wave energy converters with acceleration tubes and a hydraulic pump in which any leakage of hydraulic fluid from the hydraulic system belonging to the hydraulic pump of the hydraulic pump can be monitored continuously and the risk of leakage of hydraulic fluid from the hydraulic system during operation can be significantly reduced.
    This third object is achieved with a wave energy converter according to claim 5, in which the associated hydraulic system of the hydraulic cylinder is substantially housed in a pressurized volume inside or constitutes a demountable cassette mounted in the floating body or acceleration tube.
    Because the hydraulic cylinder's associated hydraulic system is mainly housed in a pressurized volume inside or constitutes the cassette, any leakage of hydraulic fluid from the hydraulic system can be captured inside the cassette and any leakage can be detected by in-line pressure measurement, which makes it possible to stop the hydraulic system immediately upon detection. pressure drop, which reduces the risk of leakage of hydraulic fluid from the hydraulic system underrun. Since measures to check and, if necessary, repair the hydraulic system can be taken without any unnecessary delay, the risk of any major discharges of hydraulic fluid also occurs.
    Additional objects and advantages of the invention and the features which make it possible to achieve these objects and advantages will become apparent from the following description.
    BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in the following by a number of different embodiments with reference to the accompanying drawings, in which part of a wave energy converter according to an embodiment of the invention retained in Figure 1 is a schematic side view, section, of a within a desired anchoring area of a mooring system while the wave energy converter operates due to wave motions in a body of water in which the wave energy converter's acceleration tube is partially submerged, Figure 2 is an enlarged schematic view illustrating how the energy conversion arrangement is arranged relative to the float body and the accelerator tube. Figure 3 is an enlarged schematic view illustrating how the energy conversion arrangement is arranged relative to the floating body and acceleration tube of a wave energy converter according to a particularly preferred embodiment of the invention.
    DESCRIPTION OF EMBODIMENTS OF THE INVENTION In the following, a number of embodiments of a wave energy converter according to the invention will be described in more detail with reference to the appended figures 1 - 3.
    The wave energy converter 100; 200 includes a float 101; 201 which may be of any type and design suitable for the purpose. Single acceleration tube 102; 202 hangs in and is attached to the float body 101; 201 and has an upper end adjacent the float and a lower end spaced from the float, a section of the acceleration tube 102; 202 forms a single working cylinder 103; 203 between the upper end and the lower end. Wave energy converters with acceleration tubes are well known to a person skilled in the art, for example from the patents SE 508 307 and SE 508 308. Upper and lower openings of the acceleration tube 102; 202 allows substantially unobstructed water flow between the working cylinder 103; 203 and a body of water 104 in which the acceleration tube 102; 202 is at least partially submerged when the wave energy converter operates due to wave motions. Working cylinders 103; 203, a working piston 105 is provided; 205, which is reciprocated in the working cylinder 103; 203. 202 are provided in different ways depending on the embodiment. In an advantageous The upper and lower openings of the acceleration tube 102; embodiment of the wave energy converter 100; 200, an upper opening is provided in the form of the acceleration tube 102; 202 open end at the top which opens into the atmosphere above the top of the float, while a lower opening is provided in the form of the acceleration tube 102; 202 open end at the bottom which preferably opens approximately 20 meters below the water surface in the body of water therefrom the acceleration tube 102; 202 is partially submerged. However, it is also possible to consider sealing embodiments of the invention in which one or both of the upper or lower openings are provided in the form of one or more suitably dimensioned holes which are arranged through the outer surface of the acceleration tube in suitable places.
    It is advantageous that the wave energy converter 100 according to the invention further includes an arrangement for so-called maximum force relief, in order to reduce the risk that the working piston 105, the energy absorbing device 107 or other components of the wave energy converter 100 are damaged by the forces from excessive wave motions. Such an arrangement can, as indicated in Fig. 1, be advantageously provided in that the working cylinder 103 is arranged in the acceleration tube 102 and formed with a shorter length and smaller inner diameter than the acceleration tube 102, and that the working piston 105 is formed with an outer diameter fitting inside the working diameter and inner diameter of the working cylinder 103. to have a maximum stroke which is longer than the length of the working cylinder 103 and shorter than the length of the acceleration tube 102. In order to have less material return and simpler manufacture, the working cylinder in an advantageous embodiment of the invention can also be given a smaller outer diameter than the inner diameter of the acceleration tube.
    In embodiments where the wave energy converter 100 is provided with a suitably designed and dimensioned arrangement for maximum power relief as described above, an excessive wave peak or wave valley passing the wave energy converter 100 will cause the working piston 105 to be forced to an end position outside the working cylinder 103. inside the acceleration tube 102 is formed between the smaller outer diameter of the working piston 105 and the larger inner diameter of the acceleration tube 102 outside the working cylinder 103 and is kept open to let water through until the excessive wave peak or wave valley has passed.
    The wave energy converter 100 further comprises a mooring system 108 which is arranged to hold the wave energy converter 100 within a desired anchoring area 109 and comprises at least one fastening device 110 mounted on the wave energy converter 100 for fixing a mooring line 111 to the wave energy converter 100.
    The mooring system of the wave energy converter according to the invention may thus comprise one or more mooring lines, but preferably comprises at least two mooring lines, of which at least one and preferably all are provided with at least one elastic portion or at least one floating body which post-tensioning the line (s) can also hold. when large waves pass by the float. The mooring system of the wave energy converter according to the invention may also comprise one or more fastening devices for fixing the mooring line (s), but preferably comprises at least two fastening devices, of which at least one and preferably all comprise a winch or a rotationally fixed winding device mounted on the floating body. a gentle and non-slip fixation of the mooring line to the floating body. In addition, a wave energy converter 100 according to energy conversion 106 comprises the invention of arrangements for comprising at least one energy absorbing device 107: 207 which absorbs energy from the working piston 105; 205 movements relative to the float 101; 201 as a result of said wave motions.
    The energy absorbing device 107; 207 of the wave energy converter according to the invention comprises a hydraulic pump in the form of a hydraulic cylinder 112; 212with an internal pump piston 113; 213 connected to at least one hydraulic piston rod 114, 115; cylinder shell or piston rod, are mechanically connected to the working piston 105; 215, 220. One of the main parts of the hydraulic cylinder, i.e. 205 while the other is connected to the floating body 101; 201 of the wave energy converter. The piston rod may in one embodiment, illustrated in Figures 1 and 2, comprise two piston rod parts, a piston rod part 114 which enters and exits the hydraulic cylinder 112 and is fixed in the pump piston 113, and another piston rod part 115 which is fixed in the working piston 105. In another embodiment, illustrated in Figure 3, the hydraulic cylinder 212 is provided with a hydraulic piston rod 220 extending upwardly from the hydraulic cylinder 212 (when the floating body 201 is in its normal floating position) and is mechanically coupled to the floating body 201. In such an embodiment, the cylinder shell 20 is mechanically coupled to the hydraulic cylinder 212. the above-mentioned embodiments are the working piston 105; 205 normally disposed below the pump piston 113; 213 in the vertical direction, i.e. hydraulic cylinders112; 212 is arranged at a higher level in the wave energy converter 100; 200 even work piston 105; 205 inside the acceleration tube 102; 202 is.
    In the wave energy converter 100; 200 according to the invention is at least one float body 116; 216, which has a buoyancy force in the body of water where the wave energy converter 100; 200 operates, coupled to the working piston 105; 205 and preferably arranged on the at least one piston rod 114, 115; 215 below or near the pump piston 113; 213. In the embodiment illustrated in Figures 1 and 2, 116 is a piston rod 114. The float body 116 is typically about half a meter above the body and the float body below the pump piston 113 at the end of the hydraulic cylinder 112, this embodiment floats approximately one meter below the mean surface of the accelerator tube 2. In the embodiment illustrated in Figure 3, the float body 216 is integrated with the cassette / pressure vessel as will be described in more detail below. In the embodiment according to Fig. 3, the upwardly directed piston rod of the hydraulic cylinder 212 will typically reach about 1 meter below the mean water surface in the acceleration tube 3, i.e. 213 the length of the piston rod length is below the mean water surface. In the embodiment according to Fig. 3, that is to say, the pump piston is smaller than the entire hydraulic system integrated in the float body 216, which must therefore have a larger volume in order to be able to support the larger mass. In the embodiment according to Fig. 3, therefore, the float body 216 floating at the mean water surface will typically extend from about 1 meter above the water surface to about 3 meters below the mean water surface. The mean water surface, or calm water surface, refers to the level at which the water surface would be in calm weather without waves. Under such conditions, both the floating body of the wave energy converter101; 201 and the float body 116; construction water lines flush with the water surface outside and inside 216, respectively, to flow with their respective acceleration tubes 102; 202. The buoyancy of the float body 116; 216 retain the work piston 105; 205 within a desired vertical joint in adapted to work area in the working cylinder 103; 203 when the wave energy converter 100; 200 working. Thanks to the provision of such a float body, with a suitably adapted volume, shape, weight, buoyancy and location on the piston rod, the advantage is obtained that the average position of the working piston in the acceleration tube is made to communicate with and will be controlled by the average level of water surface. sunken. This effectively prevents the working area of the work piston from sliding away or shifting from the optimum position in the acceleration tube.
    The float body 116, seen vertically, preferably has a cross-sectional area A1 which is at least 8%, even more advantageously more than 16%, of an internal acceleration tube 102. Thanks to such a buoyancy force for providing a restoring force which ensures that the float body 116 has a cross-sectional area a sufficiently large return to its intended floating position and that the work piston 105 is thereby moved back to its intended working area after a disturbance. Such a disturbance may, for example, consist in that an unusually large wave has displaced the working piston 105 to the sitting end position so that water has flowed past the working piston or that an unusually large wave has struck the acceleration tube 102 from above. When the working piston 105 is to be returned to its intended working area inside the working cylinder 103 after such a disturbance, a relatively large force is needed to force the water past the narrow gap between the working piston 105 and the inner walls of the working cylinder 103, which means that the float body 116 should be dimensioned to provide sufficient restraint. force.
    In more detail, during normal operation, the working piston 105 is always inside the working cylinder 103. Under such conditions, only a limited amount of water passes through the narrow gap around the working piston 105, which means that the amount of water in the acceleration tube 102 above the working piston 105 is substantially constant. The float body 116 therefore floats at all times in its normal floating position. If the working piston 105 is forced outside the working cylinder 103, e.g. of a large wave, opens a larger passage for water past the work piston. The purpose of this is to reduce the force on the work piston and thus the maximum forces that the wave energy converter must withstand, which enables the wave energy converter to be given a lighter and cheaper construction. At times when such a maximum force relief occurs, the amount of water in the acceleration tube 102 of the working piston 105 will increase if the working piston above is forced out of the working cylinder 103 in the upward direction and decrease if the working piston 105 is forced out of the working cylinder 103 in the downward direction. Because the water level around the float body 116 also changes in such cases, the float body 116 will then apply a force to the working piston 105 which keeps it in its end position outside the working cylinder 103 until the level of the scale has changed so that the normal amount of water in the acceleration tube 102 above the working piston 105 is restored. 100 can start working normally again. To ensure such a function, the float body 116 should be dimensioned to provide a force large enough so that the working piston 105 does not start moving prematurely due to the force of the overflowing water on the working piston 105 when it is in its end position outside the working cylinder103. The force change that the float body 116 applies to the work piston 105 is directly proportional to the float body cutting area's change in height of the floating water surface relative to the float body 116. Experiments have shown that the float body 116 waterline cutting area is larger than 8% of the work piston 105 area and the float also remains floating. the level in the acceleration tube 102 long enough in most cases.
    Another case that may occur is that a wave strikes over the edge of the buoyancy body 101 and into the acceleration tube 102 so that the amount of water inside the acceleration tube 102 above the working piston 105 is increased. In such a case, the water surface around the float body 116 will rise so as to exert a lifting force on the working piston 105. This can happen when the working piston 105 is inside the working cylinder 103. Because the lifting force from the floating body 116 is large enough, water is forced through the narrow gap between the water piston and the working cylinder. fast so that the amount of water inside the acceleration tube 102 above the work piston 105 is quickly restored to its normal level.
    In an advantageous embodiment of the wave energy converter 100; 200 according to the invention is upper 117; 217 and lower 118, respectively; 218 buffer means arranged inside the acceleration tube 102; 202 to limit the work piston105; 205 maximum deflection in the vertical direction when the wave energy converter 100; 200workers. Buffer means 117; 118; 217, 218 are preferably of rubber. It is advantageous if both the upper and lower buffer members act directly on the working piston (not shown in the figures), since the forces which strive to displace the working piston come from the water movement in the acceleration tube and act on the working piston. The power paths then become shorter and the material consumption can be reduced with sufficient strength. However, in an embodiment illustrated in Figure 3, where the float body 216 is integrated with a demountable hydraulic cassette 219, as will be described in more detail below, it is more advantageous if the upper buffer members 217 act on the top of the float body 216. This is because it then becomes easier to loosen the upper buffer members 217 to lift out the entire hydraulic cartridge 219 together with the work piston 205. Thanks to buffer means, e.g. suitably arranged rubber blocks, the risk of the provision of such preferably resilient damage to the working piston and / or the float body in case of excessive wave movements is minimized.
    In another advantageous embodiment of the wave energy converter 100; 200 according to the invention has the hydraulic cylinder 112; 212 one with the internal pump piston 113; 213 interconnected piston rod 114; 220 which reciprocates via an opening with enclosing sealing means (not shown in the figures), partly in the hydraulic cylinder 112; 212 retracted and protected position and a partially original hydraulic cylinder 112, respectively; 212wave energy converter 100; 200 operates, with the piston rod 114 connected interconnected with the inner or displaced relative to the jacket of the hydraulic cylinder, between an extended and exposed position near the pump piston 114; 220 is arranged to, in the partially extended and exposed position, have an exposed part which subnormal conditions are above the mean water surface of the body of water in which the acceleration tube 102; 202 is at least partially submerged. Thanks to the atten with the internal pump piston 113; 213 interconnected piston rod 114; 220 is arranged so that in the partially extended and exposed position sub-normal conditions are above the mean water surface, the risk of pre-growth of barnacles and other marine organisms is significantly reduced, which reduces operational disturbances and downtime for cleaning work.
    In a preferred embodiment of the wave energy converter 100; 200 according to the invention is the hydraulic cylinder 112; 212 associated hydraulic system substantially housed in a pressurized volume within or constituting a disassembly bar cassette 119; 219 mounted in the buoyancy body 101 or the acceleration tube 202 when the wave energy converter 100; 200 working. Hydraulic cylinder 112; 212 associated hydraulic systems preferably comprise at least hydraulic fluid lines for connecting at least one pump chamber of the hydraulic cylinder to a hydraulic pressure accumulator and further to a hydraulic motor in drive connection with a generator (not shown in the figures) in operation of the wave energy converter, at least the hydraulic engine enclosed in the hydraulic engine. This eliminates the need for a seal for a rotating shaft. This is because the inside of the hydraulic motor is normally given the same pressure as the pressurized volume. If then everything that is connected to the rotating shaft of the hydraulic motor is housed in the pressurized volume, no shaft seal is needed. It is particularly advantageous if also other hydraulic components such as valve blocks, the pressure accumulator and any filters are all housed inside the demountable cassette 119; 219, which is provided with at least one electric current bushing input to or produced by the wave energy converter 100; 200.
    Due to the fact that the hydraulic cylinder's associated hydraulic system is mainly housed in a pressurized volume inside or constitutes the cassette, any leakage of hydraulic fluid from the hydraulic system can be captured inside the cassette and any leakage can be detected in-line operation of the wave energy converter. immediately upon detection of a pressure drop in that pressurized volume inside the cassette. Alternatively or in addition, the piston rod seals of the hydraulic cylinder 112; 212 can be provided with an additional seal outside the ordinary fluid seal (not shown in the figures) with a gossip space in between. By checking whether hydraulic fluid leaked into the gossip space, an indication is obtained before the piston rod seal begins to become fluid. the surroundings. Thanks to such a cassette construction, the risk of leakage of hydraulic fluid from the hydraulic system during operation is reduced and since measures to check and if necessary repair the hydraulic system can be taken without any unnecessary delay, the risk of any major emissions of hydraulic fluid occurs in the water mass where the wave energy converter operates.
    In a particularly preferred embodiment of the invention, illustrated in Figure 3, the hydraulic cylinder 212 is also housed inside the demountable cassette 219. By also arranging the hydraulic cylinder 212 inside the demountable cassette, an integrated energy absorbing and energy converting unit can be maintained in which the hydraulic hearing pump with the entire hydraulic pump The hydraulic motor and generator are enclosed, which minimizes the risk of hydraulic fluid leakage and also facilitates servicing in the event of a malfunction of the components inside the cassette, as the faulty cassette has a design that makes it easy to disassemble and replace with a new fault-free cassette. The faulty cassette can then be inspected and repaired in a workshop, which is much simpler and more reliable than performing the repair on site. In an advantageous embodiment of the invention, illustrated in Figure 3, a fluid tank 219 pre-hydraulic system is formed to form the demountable cassette. By hydraulic fluid of the associated cylinder 212 of the hydraulic cylinder 212 forming the fluid tank 219 itself, the housing of the demountable cassette can be made lighter and more compact. The fluid lines of the hydraulic system can also be made shorter so that a lower pressure drop is achieved, which enables no overpressure in the cassette to be needed. However, it is advantageous to have an overpressure in the cassette because a lowering of the pressure will immediately indicate that a leak has occurred in the hydraulic system, so that measures can be taken in good time before any hydraulic fluid has time to leak to the environment. The pressure in the cassette can be kept lower than 0.5 bar so that the cassette does not need to be certified as a pressure vessel.
    In another advantageous embodiment of the invention, the demountable bar cassette 219 is integrated with, or constitutes in itself the float body 216, as illustrated in Figure 3. In such an embodiment, the hydraulic cylinder 212 is preferably located in the demountable cassette 219 so that the exposed portion of the piston rod 220 is above average water surface, ie. over the design waterline, in the acceleration pipe 202. Such a design reduces the number of necessary components of the wave energy converter 200 and thus provides a lower weight and bearing manufacturing costs and also enables shorter pipelines and thus lower pressure drops in the hydraulic lines. In this embodiment, it is particularly advantageous to let the pressurized volume constitute the cassette and to provide an additional piston rod seal outside the ordinary fluid seal.
    In yet another advantageous embodiment, the demountable cassette 219 is arranged to be cooled by water moving around the floating body and / or the inside acceleration tube 202 when the wave energy converter 200 is operating. This embodiment is advantageous because it eliminates the need for cooling water pumps and cooling water lines to transport excess heat away from the cassette. Such water cooling can be achieved in a very simple and advantageous manner when the hydraulic cassette 219 is integrated with the float body 216 and placed inside the acceleration tube 202.
    In other embodiments (not shown in the figures), water cooling can also be achieved with the hydraulic cassette placed inside the float itself. In 14 such cases, by means of a suitable arrangement it can be ensured that water from the water mass where the wave energy converter works comes into direct contact with the hydraulic cassette, or the cassette can be placed immersed in a water-filled space in the float which thermally communicates with the water mass outside, e.g. in that the water in the water-filled space is in direct contact with the inside of the hull plate of the floating body.
    The present invention has been described above with the aid of a number of different embodiments and with reference to the accompanying drawings. It must be understood, however, that the invention is not limited to the described embodiments and to what is shown in the drawings, without considering other embodiments. within the scope of the invention as defined by the appended claims.
    权利要求:
    Claims (11)
    [1]
    A wave energy converter (100; 200), comprising a floating body (101; 201), an acceleration tube (102; 202) which hangs in and is attached to the floating body (101; 201) and has an upper end adjacent the floating body and a lower end at a distance the discharge body, a section of the acceleration tube (102; 202) forming a working cylinder (103; 203) between the upper end and the lower end, upper and lower openings of the acceleration tube (102; 202) to allow substantially (103; 203) and a body of water (104) in which the acceleration tube (102; 202) is at least partially unobstructed water flow between the working cylinder immersed when the road energy converter operates due to road movements, a working piston (105; 205) which is movable forward and eats in the working cylinder (103; 203), an arrangement for energy conversion (106) comprising at least one energy absorbing device (107; 207) which absorbs energy from the movements of the working piston (105; 205) relative to the floating body (101; 200) as a result of said road movements and a mooring system (108) arranged to pour the residual energy converter (100) within a desired anchoring area (109) and (110) the path energy converter (100) for fixing a mooring line (111) at comprises at least one fastening device mounted on the path energy converter (100), characterized by that the energy absorbing device (107; 207) comprises a hydraulic pump in the form of a hydraulic cylinder (112; 212) with a jacket and an internal pump piston (113; 213) connected to at least one piston rod (114, 115; 215, 220) which creates a mechanical connection between the floating body (101; 201 ) and the working piston (105; 205) in the working cylinder (103; 203), that at least one float body (116; 216) which has a buoyancy in the water mass where the energy converter (100; 200) works is connected to the working piston (105; 205), and that the buoyancy of the float body (116; 216) is adapted to pour the working piston (105; 205) into the working cylinder (103; 203) when the road energy converter (100; 200) is operating. within a desired vertical working area in
    [2]
    Wave energy converter according to claim 1, characterized in that the float body (116), seen in the vertical direction, has a cross-sectional area (A1) of at least 8%, even more advantageously more than 16%, of an internal cross-sectional area (A2) of the acceleration tube (102). ). 16
    [3]
    A wave energy converter according to any one of the preceding claims, in that upper (117; 217) and lower (118; 218) buffer means are arranged inside the acceleration tube (102; 202) to limit (105; 205) the wave energy converter (100; 200) operating , said lower buffer means (118; 218) acting on the working piston (105; 205). characterized the maximum stroke of the working piston vertically when
    [4]
    Wave energy converter according to one of the preceding claims, characterized in that the hydraulic cylinder (112; 212) has a piston rod (114; 220) connected to the internal pump piston (113; 213) which is intended to move forward via an opening with enclosing sealing means. again between a position which is partially inserted into the hydraulic cylinder (112; 212) and a protective position and a position which is partially extended out of the hydraulic cylinder (112; 212) and exposed when the wave energy converter (100; 200) operates, and that the piston rod (114; 220) connected to the internal pump piston is arranged in the partially extended and exposed position to exhibit an exposed part which under normal conditions is above the mean water surface of the body of water in which the acceleration tube (102; 202) is at least partially submerged.
    [5]
    Wave energy converter according to one of the preceding claims, characterized in that the associated hydraulic system of the hydraulic cylinder (112; 212) is substantially housed in a pressurized volume inside or constitutes a detachable cassette (119; 219) mounted in the float (101) or the acceleration tube (20). ).
    [6]
    The wave energy converter according to claim 5, characterized in that the associated hydraulic system of the hydraulic cylinder (112; 212) comprises at least hydraulic fluid lines for connection of at least one pump chamber of the hydraulic cylinder to a hydraulic pressure accumulator and further to a hydraulic motor in drive connection with the generator. , the hydraulic motor and the generator are all housed inside the disassembly bar cassette (119; 219), which is provided with at least one bushing for electric current supplied to or produced by the wave energy converter (100; 200). 17
    [7]
    A wave energy converter according to claim 5 or 6, characterized in that the hydraulic cylinder (212) is also housed inside the demountable cassette (219).
    [8]
    A wave energy converter according to any one of claims 5-7, characterized in that the associated hydraulic system of the hydraulic cylinder (212) occupies a tluid tank (219) dry hydraulic sound which forms the demountable cassette.
    [9]
    A wave energy converter according to any one of claims 5-8, characterized in that the demountable cassette (219) is integrated with, or in itself constitutes the lottery body (216).
    [10]
    A wave energy converter according to any one of claims 5-9, characterized in that the demountable cassette (219) is arranged to be cooled by water moving around the teat body and / or the inside acceleration tube (202) when the wave energy converter (200) is operating.
    [11]
    A wave energy converter according to any one of the dry claims, characterized in that the working cylinder has a smaller outer diameter than the inner diameter of the acceleration tube.
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    同族专利:
    公开号 | 公开日
    US10197039B2|2019-02-05|
    SE539195C2|2017-05-09|
    WO2017026934A1|2017-02-16|
    EP3334926A1|2018-06-20|
    EP3334926A4|2019-01-16|
    EP3334926B1|2020-03-25|
    US20180238294A1|2018-08-23|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1530115A|SE539195C2|2015-08-10|2015-08-10|Wave energy converter including piston rod with float body|SE1530115A| SE539195C2|2015-08-10|2015-08-10|Wave energy converter including piston rod with float body|
    EP16835538.6A| EP3334926B1|2015-08-10|2016-07-30|Wave energy converter comprising a piston rod with a float body|
    PCT/SE2016/000041| WO2017026934A1|2015-08-10|2016-07-30|Wave energy converter comprising a piston rod with a float body|
    US15/751,691| US10197039B2|2015-08-10|2016-07-30|Wave energy converter comprising a piston rod with a float body|
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