• 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:
    Unidirectional valve for a device for collecting energy from the waves, which allows the passage of air in a single direction and comprising a cover (2) hinged to a support (7), the cover (2) being configured to close against a valve seat (3) preventing the passage of air, and said cover (2) being pivotable with respect to the support (7) around a pivot axis. The valve comprises at least one joint (9) that joins the cover (2) to the support (7), each joint (9) comprising elastic and/or magnetic joining means (10) that allow the pivot axis to pivot with with respect to the support (7) during the opening and closing of the lid (2), the pivoting axis of the coplanar lid (2) being arranged to the valve seat (3) in a closed position of the unidirectional valve (1)). (Machine-translation by Google Translate, not legally binding)
    公开号:ES2677256A1
    申请号:ES201730105
    申请日:2017-01-31
    公开日:2018-07-31
    发明作者:Eduardo Villarroel Pinedo
    申请人:Sener Ingenieria y Sistemas SA；
    IPC主号:
    专利说明:

    Unidirectional valve for a wave energy capture device
    SECTOR OF THE TECHNIQUE
    The present invention relates to a unidirectional valve for a wave energy capture device.
    PREVIOUS STATE OF THE TECHNIQUE
    In the field of wave energy or energy generated from the waves, the oscillating water column (also called Oscilating Water Column or OWC) is known, which consists of a structure partially submerged in the sea that allows the movement of the Sea compress / decompress the air enclosed in the structure. When a wave enters the OWC, the movement of the water presses and pushes the air that is in an air chamber of the structure, upwards and makes it pass through a turbine specially designed for this purpose. Once the water is removed, the air in the column is decompressed and sucked through the turbine. A generator coupled to the turbine converts the latter's rotational mechanical energy into electricity.
    Due to the upward-downward movement of the wave's water sheet, the movement of the air is bidirectional inside the column, so, in order to use unidirectional turbines, an alternative flow conversion into unidirectional flow must be performed.
    Unidirectional or non-return valves can be used to achieve the rectification of the flow, which manage the direction of the air flow by conveniently isolating some chambers of the device from others.
    Currently, unidirectional flow control valves are widely known, both conceptually and industrially, and are used in different applications, both for liquids and gases.
    The unidirectional valves currently proposed for use in OWC devices for power generation from waves are currently underdeveloped and
    5 even less experienced, on the one hand, because the vast majority of devices employ two-way turbines and therefore do not need to rectify the flow, and on the other, the short development of OWC technology with the use of unidirectional turbines.
    The periods of movement of the waves vary depending on locations, state of the sea
    10 and even between the different waves of a series, which determines that the process of opening and closing the valve is automatic and caused by the action of the wave itself. Likewise, the variation in the height of the water column is also a variable of the sea conditions at each moment.
    15 There are multiple possible implementations on actions for the opening and closing of unidirectional valves, as well as their designs to operate in a marine environment.
    Document TW200825276A refers to an energy collection system
    20 wave in which, among many other elements, it comprises a unidirectional valve for air ducts that includes a lid that closes against a valve seat and a sealing system, the valve being inserted in the air duct.
    The document JP2013133842A describes a unidirectional valve comprising a seat arranged in the middle of the flow path, a pivot arm articulated to an axis disposed in the upper part of the valve seat, said arm being adapted to rotate with respect to the axis, and a closure element disposed at the end of the arm. The closing element closes against the seat due to its own weight and comprises a part that closes against the seat
    30 and a part that extends radially outward from the part that closes against the valve seat.
    Finally, document W02016093511A1 discloses a unidirectional valve for
    water pipes comprising a cover with two arms and articulation means that couple the turning arms with a support structure of the water pipe, and which allow the rotation of said arms and therefore of the cover with respect to the support . The valve also includes shock absorbers whose objective is the suppression of vibration and noise generated during the opening and closing of the valve.
    EXHIBITION OF THE INVENTION
    The object of the invention is to provide a unidirectional valve for a wave energy capture device, as defined in the claims.
    The unidirectional valve of the invention comprises a cover articulated to a support, the cover being configured to close against a valve seat preventing the flow of air, and said cover being pivotable with respect to the support around a geometric pivot axis.
    The unidirectional valve comprises at least one joint that joins the cover to the support. The joint comprises elastic and / or magnetic joining means, said joining means allowing the geometric pivot axis to swing with respect to the support during opening and closing of the lid. The geometric pivot axis of the cover is arranged coplanar to the valve seat in a closed position of the unidirectional valve.
    In this way, the cover is attached to the support in a floating way through said joining means, that is to say, there is no physical axis that couples the cover to the support and on which the cover pivots with respect to the support, but rather The elastic and / or magnetic joining means allow the cover to be coupled to the support without friction between said cover and said support, and without sliding contact, or rolling between the cover and the support. The lid has six degrees of freedom of movement with respect to the support thanks to said joining means. Said elastic and / or magnetic joining means allow the geometric pivot axis of the cover to swing with respect to the support and to keep the valve seat copied in the closed position of the unidirectional valve, so that a Uniform distribution of cover pressures against the valve seat.
    The elastic and / or magnetic joining means are sized so that they compensate the torque of the lid's own weight mainly, compensating the static and dynamic loads to which the unidirectional valve is subjected, so as to facilitate the opening of the opening
    5 of the lid, and help the braking of the lid at the end of its extreme opening movement.
    The elastic and / or magnetic joining means prevent friction and contact between the lid and the support during opening and closing, eliminating wear and possible seizures and, in addition, have a controlled lorsional stiffness and sufficient flexural stiffness to
    10 withstand static and dynamic loads in the rotation of the valve cover.
    These and other advantages and features of the invention will become apparent in view of the figures and the detailed description of the invention.
    DESCRIPTION OF THE DRAWINGS
    Figure 1 schematically shows a wave energy capture device comprising two unidirectional valves according to the invention.
    Figure 2 shows in detail a first embodiment of the unidirectional valve of the invention in a closed position.
    Figure 3 shows a longitudinal section of the unidirectional valve shown in detail 25 in Figure 2.
    Figure 4 shows another section of the unidirectional valve shown in detail in the figure
    2.
    Figure 5 shows in detail a second embodiment of the unidirectional valve of the invention in a closed position.
    Figure 6 shows a section of the unidirectional valve shown in detail in the figure
    5.
    Figure 7 shows in detail a third embodiment of the unidirectional valve of the invention in a closed position.
    Figure 8 shows a section of the unidirectional valve shown in detail in the figure
    7.
    Figure 9 shows in detail a fourth embodiment of the unidirectional valve of the invention in a closed position.
    Figure 10 shows a section of the unidirectional valve shown in detail in the figure
    9.
    Figure 11 shows in detail a fifth embodiment of the unidirectional valve of the invention in a closed position.
    Figure 12 shows a section of the unidirectional valve shown in detail in the figure
    eleven.
    Figure 13 shows in detail a sixth embodiment of the unidirectional valve of the invention in a closed position.
    Figure 14 shows a section of the unidirectional valve shown in detail in Figure 25 13.
    Figure 15 shows a detail of the unidirectional valve shown in Figure 2.
    Figure 16 partially shows an embodiment of the unidirectional valve of Figure 2, 30 further comprising damping means.
    DETAILED EXHIBITION OF THE INVENTION
    Figure 1 shows a device for collecting energy from waves 40, also
    5 known as an oscillating water column or OWC, comprising an air chamber 44, a pneumatic pressure lung 41, a pneumatic depression lung 42 and two unidirectional turbines 45a and 45b each of which is arranged coupled to the pressure lung 41 and 42 corresponding. The wave capture device 40 further comprises a unidirectional valve 1 at the inlet of the pressure lung 41 and a unidirectional valve 1
    10 at the exit of the depression lung 42.
    The wave has an upward and downward movement that causes the ascent and descent of the water column 46 schematically represented in Figure 1 by means of the continuous arrows B and discontinuous C respectively. When the water column 46 rises (shown 15 with the arrow B in Figure 1), the pressure created in the air chamber 44 causes an air flow that passes through the unidirectional valve 1 disposed at the inlet of the lung of pressure 41 and enters pressure lung 41 creating an overpressure. The air concentrated in the pressure lung 41 has sufficient pressure to move the corresponding unidirectional turbine 45a and exit into the atmosphere. This stage will also be
    20 referred to throughout the description as a flow stage.
    Once the flow stage is finished, when the water column 46 begins its descent (shown with arrow C in Figure 1), the air from the atmosphere passes through the other unidirectional turbine45b into the depression lung 42 filling it , and from that lung
    25 of depression 42 the air is poured, through the unidirectional valve 1 coupled to said depression lung 42, into the air chamber 44. This stage will also be referred to throughout the description as a counterflow stage.
    Unidirectional valves 1 open and close alternately in each pressure lung
    30 41 Y of depression 42 allowing overpressure in the pressure lung 41 and vacuum in the depression lung 42.
    Each unidirectional valve 1 according to the invention comprises a lid 2 articulated to a
    support 7 of the corresponding lung 41 and 42, the lid 2 being configured to close
    against a valve seat 3 preventing the passage of air flow in one direction. The cover 2 is pivotable with respect to the support 7 around a geometric pivot axis A.
    5 Each one-way valve 1 comprises at least one joint 9 that joins the cover 2 to thesupport 7. Each joint 9 comprises elastic and / or magnetic joining means 10,said joining means 10 allowing the geometric pivot axis A to swing withwith respect to the support 7 during the opening and closing of the cover 2, the shaft being arrangedgeometric pivot A of the cover 2 copies the valve seat 3 in a position of
    10 one-way valve closure.
    In this way, the cover 2 is attached to the support 7 in a floating manner through said joining means 10, that is to say there is no physical axis that holds the cover 2 attached to the support 7 and on which the cover 2 pivots with with respect to the support 7, but the elastic 15 and / or magnetic joining means 10 are those that hold the cover 2 attached to the support 7 without a contact by direct sliding, rolling or friction between the cover 2 and the support 7. The cover 2 is attached
    to the support 7 so that it has six degrees of freedom with respect to said support 7. In addition, a uniform distribution of pressures is achieved while the cover 2 closes against the valve seat 3.
    20 The joining means 10 are radially and axially elastic, that is, when they are removed from their equilibrium position, corresponding to the minimum energy position, they try to return to said minimum energy position, the minimum energy position being their center geometric
    25 On the other hand, the unidirectional valve 1 comprises sealing means 30, shown in Figure 3, configured to obtain the sealing of the closure of the cover 2 against the valve seat 3.
    Thanks to the fact that the geometric pivot axis A of the cover 2 is arranged coplanar to the seat
    30 of valve 3 in the closed position, a uniform distribution of pressures in the sealing means 30 is achieved during the closing of the cover 2 against the valve seat 3, reducing the wear of the sealing means 30. In this way , the sealing means 30 are prevented from moving (even slightly) in each of the
    opening and closing operations and that said sealing means 30 are deformed asymmetrically.
    In the embodiments of the unidirectional valve 1 shown in Figures 2 to 14, the valve seat 3 forms an angle with the vertical plane between approximately 10 ° and approximately 15 °. In this way, the cover 2 exerts a pressure on the valve seat 3 which establishes the seal during the counterflow stage, keeping the unidirectional valve 1 closed, but allows the opening of the cover 2 with a minimum pressure in the flow direction. from air. The pressure exerted by the cover 2 on the valve seat 3 is mainly due to the horizontal component of the weight of the cover 2.
    In other embodiments not shown, the unidirectional valve 1 can take another position with respect to the vertical plane.
    On the other hand, the joining means 10 have a controlled torsional stiffness and a sufficient flexural stiffness to support the loads during the opening and closing movement of the cover 2. The joining means 10 prevent friction and contact between the cover 2 and support 7 during opening and closing, eliminating wear and possible seizures.
    The preload torque is defined as the preload to which the joining means 10 are subjected to withstand the torque due to the weight of the cover 2 and which allows the unidirectional valve 1 to open exerting minimal pressure in the direction of the air flow.
    The elastic joining means 10 are designed so as to favor the opening of the unidirectional valve 1 from the closed position, at the beginning of the flow or counterflow stage, with a minimum pressure. As the unidirectional valve 1 is opened, the torsional force of the joining means 10 decreases by collaborating said joining means 10 less and less in the opening of the cover 2. From a given preload pair of the joining means 10, the torsional force changes sign, which allows even stopping the lid 2 towards positions of maximum opening of the lid 2 compensating the aerodynamic thrust of the air flow.
    In a preferred embodiment, as in the embodiments shown in Figures 2 to 14, the unidirectional valve 1 comprises two joints 9 that connect the cover 2 to the support 7, the joints 9 being aligned on the geometric pivot axis A in the closed position of the unidirectional valve 1.
    In the embodiments of the unidirectional valve 1 shown in Figures 2, 3, 4 and 7 to 14, the cover 2 comprises two arms 5 through which said cover 2 is coupled to the support 7 in a pivotable manner, while in the embodiment shown in figures 5 and 6, the cover 2 comprises a single arm 5.
    Regardless of the number of arms 5 as well as the number of joints 9, the features that will be described below can be implemented in all the unidirectional valves 1 shown in Figures 2 to 14.
    Each joint 9 included in the unidirectional valves 1 shown in Figures 2 to 14, comprises a first part 11 fixed to the support 7 and a second part 12 fixed to the cover 2, in particular to the corresponding arm 5, and aligned with the geometric axis of pivot A, with the elastic and / or magnetic attachment means 10 fixed to the first part 11 and the second part 12. In other embodiments not shown the first part 11 and / or the second part 12 could be integrated in the support 7 and in the cover 2 respectively, forming a single piece with the support 7 and the cover 2 respectively.
    In a first embodiment of the invention shown in Figures 2 to 4, the joining means 10 are elastic and comprise a helical spring13. One end of the coil spring 13 is fixed to the first part 11 of the joint 9 and the other end to the second part 12 of the joint 9. In addition, the joints 9 comprise a rod 17 that passes through the cover 2, in particular the arms 5 of the cover 2, and which fixes the first part 11 of each joint 9 to the corresponding support 7.
    In a second embodiment of the invention shown in Figures 5 and 6, the joining means 10 are also elastic and comprise a biconic spring 15. An end 15a of the biconic spring 15 is fixed to the first part 11 of the joint 9, and the opposite end 15b to the second part 12 of the joint 9. In this embodiment, the diameter of the central part 15c of said biconic spring 15 is greater than the diameter of each end 15a and 15b of the spring
    15. In other embodiments not shown, the diameter of the central part of the biconic spring 15 may be smaller than the diameter of each end of the spring 15.
    In a third embodiment of the invention shown in Figures 7 and 8, the joining means 10 comprise a plurality of elastic slats 16 extending between the first part 11 and the second part 12 of the corresponding joint 9. One end of each blade 16 is fixed to the first part 11 of the joint 9 and the end opposite to the second part 12 of the joint 9. This geometry of axial slats 11 between the disks 11 and 12 very well supports bending.
    In this embodiment, the first part 11 and the second part 12 have a disk shape. In addition, in this embodiment. The joints 9 comprise a rod 17 that crosses the lid 2, in particular the arms 5 of the lid 2, and an elastomeric element 22 coupled to the rod 17 next to the first part 11. The rod 17 fixes the first part 11 of each joint 9 to the corresponding support 7, while the elastomeric element 22 absorbs the axial displacements of the axial slats 16 and the second part 12 that occur during the opening and closing of the cover 2.
    In another embodiment shown in Figures 9 and 10, the joining means 10 comprise an elastomer plug 14. One end of the elastomer plug 14 is fixed to the first part 11 of the joint 9 and the opposite end, to the second part 12 of the joint 9. The joints 9 further comprise a rod 17 that crosses the lid 2 in particular the arms 5 of the lid 2 and the elastomer plug 14, and which fixes the first part 11 of each joint 9 to the corresponding support 7 .
    In another embodiment shown in Figures 11 and 12, the joining means 10 comprise a magnetic bearing 18. The magnetic bearing 18 comprises a plurality of magnets 19 respectively coupled to the first part 11 and the second part 12 of the respective joint 9, the magnets 19 being arranged so that they face the same polarity.
    The joints 9 further comprise a rod 17 that passes through the cover 2 and fixes the first part 11 to the support 7. The magnetic bearing 18 has an air gap e in the entire circumference of, at most, approximately 5 mm and, thanks to which, keeps the cover 2 of the rod 17 apart. Thanks to the radial and axial direction repulsion between the magnets 19 facing the same polarity, the contact is kept separate, without contact,
    cover 2 and the stem 17.
    The magnets 19 are preferably neodymium, although they can be made of any other material that provides the desired characteristics. In order to adjust air gaps and thereby balancing forces, the section profile of each pair of magnets facing can be between cylindrical and conical. The elastic effect in the rotation, not used in applications of magnetic axes, is achieved by interleaving the polarities sectorially.
    In another embodiment shown in Figures 13 and 14, the joining means 10 are elastic and magnetic. Said joining means 10 comprise a helical spring 13 and a magnetic bearing 18 comprising a plurality of magnets 19. The plurality of magnets 19 are respectively fixed to the first part 11 and the second part 12 of the respective joint, the magnets 19 being arranged so that they face the same polarity.
    The joints 9 further comprise a rod 17 that passes through the cover 2 and fixes the first part to the support 7. The magnetic bearing 18 includes an air gap an air gap e in the entire circumference of, at most, approximately 5 mm, thanks to which it is maintained separate, without contact, the cover 2 of the stem 17.
    In the embodiment shown in Figures 13 and 14, the helical spring 13 is arranged concentric to the magnetic bearing 18. One end of the helical spring 13 is arranged fixed to the arm 5 of the cover 2 while the other end is arranged fixed to the support 7 through the first part 11.
    Although in the embodiment shown in Figures 13 and 14, the joining means 10 comprise a helical spring 13 combined with a magnetic bearing 17, in other embodiments not shown, the joining means could include any of the elastic means described in the embodiments. shown in figures 2 to 10.
    On the other hand, to achieve rapid opening and closing of the unidirectional valve 1, in a preferred embodiment, as in the embodiments shown in Figures 2 to 14, the cover 2 has a specific geometry and includes a flat base 4 which extends perimeter to the cap and closes against the valve seat 3. This aerodynamic geometry of the cap in addition to optimizing the use of the material used, optimizes the aerodynamic coefficients of flows, generating aerodynamic supports that reduce losses and, therefore, a performance greater in the complete operation of the unidirectional valve.
    This cap geometry of the lid 2 produces an upward thrust of the lid 2 similar to the lift of the aircraft wing. This effect accelerates the opening of the lid 2 by displacing it from the flow itself, reducing aerodynamic losses and stabilizing the unidirectional valve 1 in a nominal equilibrium position, the equilibrium position being that in which the opening torque of the lid 2, exerted by the flow on the cover 2 equals the closing torque of the cover 2 due to the weight thereof and the residual torque of the joining means in said position. In this way, violent openings of the cover 2 that exceed a maximum opening angle, greater than that corresponding to the nominal equilibrium position, are avoided. Also, the lowering of the cover 2 from the maximum opening position to the closing position is smoothed minimizing violent impacts against the closing seat 3.
    In addition, the unidirectional valve 1 is fixed to the corresponding support 7 of the wave energy capture device 40 through fixing means 20. In the embodiments described throughout the description, each support 7 shown in detail in the Figure 15 includes a groove 21 that passes through the support 7 and inside which the rod is housed
    17. The geometry of the groove 21 is such that it only allows the rod 17 to be housed in a certain position. Once the rod 17 is inserted into the groove 21 and the unidirectional valve 1 is released to go to its closed position (in which it closes against the valve seat 3), the connecting means 10 are preloaded. The fixing means 20 comprise a closing element 22 arranged coupled to the support 7 and closing the opening of the groove 21 once the rod 17 is housed in the groove 21. The closing element 22 is coupled to the support 7 so which can pivot with respect to a pin 26 parallel to the rod 17 between a mounting position that allows the rod 17 to be housed in the support 7 and a closed position, shown in Figure 15, in which the closing element 22 blocks the disassembly of the rod 17. The fixing means 20 further comprise clamping means 23 that fix the closing element 22 to the support 7 keeping the connecting means 10 preloaded in the groove 21 in the closed position.
    The closure element 22 shown in Fig. 15 has an embracing shape so that the free ends 22b are pivotally coupled to the support 7 and the clamping means23
    5 comprise a washer 24 that rests on the closing element 22 and a screw 25 that passes through the washer 24 and the closing element 22, being screwed to the support 7 so that the rod 17 is prevented from rotating or leaving the slot 21 of support 7, canceling any slack or wear that may have occurred.
    10 On the other hand, as a result of variations in the flow conditions, flutters or vibrations of the lid 2 are usually produced during the opening thereof due to the thrust of the air flow that forces the lid 2 to open even more in relation to The nominal equilibrium position. Once the nominal equilibrium position of the cover 2 has been exceeded, said cover 2 tends to fall, again being in the air flow. This flutter phenomenon is repeated so
    15 more or less cyclic, depending on the frequency and amplitude of this flutter to a large extent on the inertia the lid 2 and its geometry. To minimize this effect, the unidirectional valve 1 may include a damper 35 as shown in Figure 16, configured to minimize or absorb energy when the cover 2 passes from the open position to the closed position, reducing the impact of the cover 2 against the valve seat 3 in addition to
    20 minimize flutter. The shock absorber 35 is fixed to the support 7 of the energy collection device 40 and to the cover 2 so as to reduce the impact of the cover 2 against the valve seat 3, in addition to minimizing the flutter. The shock absorber can be viscous or friction type.
    Finally, the unidirectional valves 1 described can also be used in other applications such as gas pipelines, where said unidirectional valves 1 have the function of flame extinguishing.
    权利要求:
    Claims (9)
    [1]
    1. Unidirectional valve for a wave energy capture device, which allows the passage of air flow in a single direction and blocks it in the opposite direction, 5 comprising the unidirectional valve (1) a cover (2) articulated to a support (7), the cover (2) being configured to close against a valve seat (3) preventing the passage of air flow, and said cover (2) being pivotable with respect to the support (7) about an axis geometric pivot (A), characterized in that it comprises at least one joint (9) that joins the cover (2) to the support (7), each comprising
    10 articulation (9) elastic and / or magnetic joining means (10) that allow the geometric pivot axis (A) to swing with respect to the support (7) during the opening and closing of the cover (2), providing the Pivot geometric axis (A) of the cover (2) coplanar to the valve seat (3) in a closed position of the unidirectional valve (1).
    [2]
    2. Unidirectional valve according to claim 1, wherein the joint (9) is aligned on the geometric pivot axis (A) in the closed position of the unidirectional valve (1).
    3. A unidirectional valve according to claim 2, comprising two joints (9) joining the cover (2) to the support (7), the joints (9) being aligned on the geometric pivot axis (A) in the position of one way valve closure
    (one )
    4. Unidirectional valve according to any of the preceding claims, wherein the joining means (10) are radially and axially elastic.
    [5]
    5. Unidirectional valve according to any of the preceding claims, wherein
    The cover (2) comprises at least one arm (5) where the corresponding joint (9) 30 is fixed.
    [6]
    6. Unidirectional valve according to any of the preceding claims, wherein each joint (9) comprises a first part (11) fixed to the support (7) and a second part (12) fixed to the cover (2) and aligned with the shaft geometric pivot
    (A), the joining means (10) being fixed to the first part (11) and to the second part (12).
    5. Unidirectional valve according to claim 6, wherein the joining means (10)they comprise a coil spring (13).
    [8]
    8. Unidirectional valve according to claim 6, wherein the joining means (10)
    they comprise an elastomer block (14). 10
    [9]
    9. Unidirectional valve according to claim 6, wherein the joining means (10) comprise a biconic spring (15).
    [10]
    10. Unidirectional valve according to claim 6, wherein the joining means (10)
    Elastic 15 comprise a plurality of elastic slats (16) extending between the first part (11) and the second part (12) of the corresponding joint (9).
    [11 ]
    eleven . Unidirectional valve according to any of the preceding claims, wherein the joining means (10) comprise a magnetic bearing (18) comprising a
    20 plurality of magnets (19) respectively coupled to the first part (11) and to the second part (12) of the corresponding joint (9), the magnets being arranged
    (19) so that they face the same polarity.
    [12]
    12. One way valve according to any of the preceding claims, which
    25 comprises fixing means (20) that fix said unidirectional valve (1) to the support (7), said fixing means (20) including a groove (21) in the support (7) where at least partially the corresponding coupling (9), a closing element (22) coupled to the support (7) that prevents disassembly of the unidirectional valve (1) from the groove (21), and a clamping means (23) that fix the element
    30 (22) to the support (7) keeping the connection means (10) preloaded in the groove (21) in the closed position.
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    同族专利:
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    ES2677256B1|2019-05-27|
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    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201730105A|ES2677256B1|2017-01-31|2017-01-31|Unidirectional valve for a device for capturing wave energy|ES201730105A| ES2677256B1|2017-01-31|2017-01-31|Unidirectional valve for a device for capturing wave energy|
    PCT/ES2018/070049| WO2018142005A2|2017-01-31|2018-01-22|Check valve for a wave energy harvesting device|
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