NO346449B1 - Sea level compensation system for wave energy compensators - Google Patents
Sea level compensation system for wave energy compensators Download PDFInfo
- Publication number
- NO346449B1 NO346449B1 NO20210522A NO20210522A NO346449B1 NO 346449 B1 NO346449 B1 NO 346449B1 NO 20210522 A NO20210522 A NO 20210522A NO 20210522 A NO20210522 A NO 20210522A NO 346449 B1 NO346449 B1 NO 346449B1
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- Prior art keywords
- chain wheel
- arm
- level compensation
- jacking
- level
- Prior art date
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- 238000000034 method Methods 0.000 claims description 24
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
- F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
- F03B13/16—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem"
- F03B13/18—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore
- F03B13/1885—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom is tied to the rem
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/08—Tide or wave power plants
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
Description
SEA LEVEL COMPENSATION SYSTEM FOR WAVE ENERGY COMPENSATORS
Technical Field
The invention relates to a sea level compensation system for wave power generators, especially a sea level compensation system that compensate for tidal period and the level of the sea at the different tidal.
Background Art
One of the challenges with sea level compensation of wave power generators is that there is a difference in the sea level caused by tidal periods. This has a great influence on the effect of a wave power generator.
Calculations have proved that the tidal difference could affect the output of the sea level compensation systems considerable.
It is also these areas where it is most interesting to install the sea level compensation systems.
There exist two types of compensators for tidal difference:
a screw type and a cabelar with direct gearbox drive.
There are some characteristics with the known types of compensators.
The screw drive has a stroke length that is limited to the length of the screw. The level is compensated by running the screw up and down.
There are also some challenges with the screw drive. These types are often influenced by wear, growth and corrosion of the screw. This system needs also fine tolerancing of the parts.
There could also be challenges in the load capacity with the screw type system, with challenge due to excessive wave forces.
The cabelar with gearbox system has on the other hand a chain that may be very long where the chain is running up and down.
In this type the wear is not a big issue, but the gearbox and drive need to be calculated according to maximum wave forces. This could again lead to excessive drive units.
The invention is advantage in that it uses a chain jack with mechanical position stopper for sea level compensation.
An object of the present invention is that the drive mechanism is only used for level compensation and does not see the permanent wave loads resulting in less fatigue in the drive mechanism.
Summary of invention
The invention relates to a sea level compensation system for wave power generator comprising a chain wheel. Said system comprises
- a jacking arm arrangement adapted to bear against a periphery of the chain wheel, said jacking arm arrangement further comprises an actuator adapted to move the chain wheel in a first rotational direction and an opposite, second rotational direction,
- a level position stopper adapted to bear against the chain wheel at a different position on the chain wheel than the jacking arm arrangement for preventing rotational movement of the chain wheel.
Preferable embodiments are set out in the dependent claims.
The system may preferably have a base frame where the chain wheel is rotationally connected. This may be a separate frame. However it may also be a part of a larger device to which the compensation system is attached.
The level compensation arm and the level position stopper may be fixedly connected respectively to a first and second actuation arm which may be in direct contact with the respective first and second release mechanism for movement of the level compensation arm and the level position stopper.
The level position stopper may also have a self-closing device or part that enables the level position stopper back into contact with the chain wheel in a self-closing manner.
The invention further relates to the method for paying out the connection line by the sea level compensation. The method comprises the sequential steps of a) moving the jacking arm arrangement away from bearing against the chain wheel,
b) extending the jacking arm arrangement freely from an initial position to an outermost position a distance from of the initial position on the periphery of the chain wheel and moving the jacking arm arrangement into contact with the periphery of the chain wheel,
c) moving the level position stopper away from bearing against the periphery of the chain wheel,
d) retracting the jacking arm arrangement towards the initial position and at the same time allow rotation of the chain wheel in a second rotational direction, allowing the level position stopper to bear against the chain wheel and prevent further rotation of the chain wheel when the jacking arm arrangement has reached the initial position.
Preferably the method comprises a repetition of the steps a) – d) until a suitable amount of the connection line is paid out. A suitable amount typically when the correct height of the buoy is reached as indicated in figure 0.
The invention further relates to a method for pull-in the connection line by a sea level compensation system. The method comprising the steps of
a) moving the chain wheel a distance in a first direction by extending the jacking arm arrangement from an initial position to an outermost position while bearing against the chain wheel,
b) retracting the jacking arm arrangement back to the initial position while preventing the chain wheel from movement in the opposite second direction by the level position stopper.
Preferably the method comprises the repetition of the steps a) – b) until a suitable amount of the connection line (3) is pulled in. As indicated in figure 0 and similar to the payout process, a suitably amount is when the correct height is reached for the buoy.
The invention also relates to a use of the sea level compensation system as a level adjusting device to compensate different tide levels.
Brief description of drawings
The invention is now described by way of example with reference to the accompanying drawings, in which;
Figure 0 shows a principal sketch of a seal level compensation system influenced by different level of tide,
Figure 1 shows the sea level compensation system according to the invention, viewed from the side,
Figure 2a shows a sectional view the sea level compensation system from fig 1, viewed without the pay-out mechanism,
Figure 2b shows a sectional view the sea level compensation system from fig 1, viewed without the pay-out mechanism, but shows the rotational arm,
Figure 3 shows a detailed view of the sea level compensation system from fig 1 and 2, illustrating both the outer and interior parts of the system,
Figure 4a and 4b shows a detailed view of the sea level compensation system according to the invention in a first step of the payout sequence,
Figure 5a and 5b shows the sea level compensation system according to the invention in a second step of the payout sequence,
Figure 6a and 6b shows the sea level compensation system according to the invention in a third step of the payout sequence,
Figure 7a and 7b shows the sea level compensation system according to the invention in a fourth step of the payout sequence,
Figure 8a and 8b shows the sea level compensation system according to the invention in a fifth step of the payout sequence,
Figure 9a and 9b shows the sea level compensation system according to the invention in a sixth step of the payout sequence,
Figure 10 shows the sea level compensation system according to the invention in a first step of the pull-in sequence,
Figure 11 shows the sea level compensation system according to the invention in a second step of the pull-in sequence,
Figure 12 shows the sea level compensation system according to the invention in a third step of the pull-in sequence,
Figure 13 shows the sea level compensation system according to the invention in a fourth step of the pull-in sequence,
Detailed description of the invention
Figure 0 shows a principal sketch of wave energy converters 1 which influenced by different level of tides. The sketch is included here to illustrate the purpose of the present invention as a device that pull in and pay out a chain or connecting line 3 to compensate for different heights of the sea level.
The wave energy converter comprises a buoy 2, a connecting line 3 or chain, a funnel 4, an upper end stop 8, a stator 5, a translator 6, a lower end stop 7 and a sea level compensation system 10. The connection line 3 may also be a combination of a chain and a line.
The sea level compensation system 10 is attached to the buoy 2 to adjust the level of the buoy 2. This is performed by paying out and pulling in the connection line 3 and will be described further in the following figures.
Figure 1-3 shows the sea level compensation system 10 according to the invention.
Figure 1 shows the sea level compensation system 10 with a base frame 26 with a first and second release mechanism 14, 17, and a first and second actuation arm 24, 25.
Figure 2 shows the compensation system 10 from figure 1 without a front part of the base frame 26 and a front part of a rotational arm 23. The figure illustrating a level compensation arm 13 and level position stopper 20 in greater detail.
Figure 3 shows both the interior features and the features arranged at the outside of the compensation system 10. The figure also indicates the connection line or chain parts 2 extending around a chain wheel 21.
The sea level compensation system 10 according to the figures 1-3 comprises a chain wheel 21 and a base frame 26. The chain wheel 21 is rotationally connected to the base frame 26. It is further adapted to receive a part of the connection line or chain 3 for movement of the connection line or chain 3 as will be further explained. The sea level compensation system 10 may further comprise a rotational arm 23. The rotational arm 23 and the chain wheel 21 have the same rotational center axis, indicated by C in figure 2b.
Figure 2b shows the sea level compensation system 10 with the rotational arm 23. In this figure a rotational center axis C of the chain wheel and rotational arm 23 is illustrated. It is further clearly shown that both the level compensation arm 13 and the second guide 19 are rotationally connected to the rotational arm 23. This is illustrated by the rotational points 13c and the end 19b.
The chain wheel 21 may comprise a plurality of notches 22 formed as hatches with one side inwardly sloping into the chain wheel 21. The distance between each notch 22 defines the steps of the sea level compensation. The plurality of notches may further have a shoulder 22a disposed in one end. The plurality of notches 22 may be evenly disposed around the periphery of the chain wheel 21. The notches 22 may however be designed differently as long as it provides a part of a stop function on the chain wheel 21 to prevent the chain wheel 21 from rotate in an unwanted direction.
The sea level compensation system 10 further comprises a jacking arm arrangement 11. The jacking arm arrangement 11 may comprise a jacking arm actuator 12 and a level compensation arm 13 rotationally connected together in the respective ends 13b, 12b of the jacking arm actuator 12 and the level compensation arm 13, as shown in the figure 1-3.
The jacking arm arrangement 11 is in an opposite second end 12a rotationally connected to the base frame 26. The opposite contact end 13a of the level compensation arm 13 is adapted to bear against the periphery of the chain wheel 21.
This will result in that the chain wheel 21 is prevented from moving in one direction when the level compensation arm 13 bear against the notch 22 or shoulder 22a of the chain wheel 21.
The level compensation arm 13 may further be fixedly attached to a first actuation arm 24. The first actuation arm 24 may be is arranged on the outside of the rotational arm 23. The rotational arm 23 connecting various part of the sea level compensation system 10, together. The rotational arm 23 may be arranged between the level compensation arm 13 and the first actuation arm 24.
The arrangement with the level compensation arm 13 and the first actuation arm 24 is further rotationally connected to the rotational arm 23. This may be through the a rotational point 13c as indicated in the figure 2.
The first actuation arm 24 has further a free end 24b adapted to be rotated by a first release mechanism 14. The free end 24b has preferably a rounded or curved end surface as shown in the figure. This will be described in greater detail in relation to the functioning of the invention.
A level position stopper 20 is arranged separately from the jacking arm arrangement 11. The level position stopper 20 has a contacting end 20a adapted to bear against the chain wheel 21 at a different notch 22 position than the level compensation arm 13. This is illustrated in the figures where the level compensation arm 13 is arranged on one side of the chain wheel 21, while the level position stopper 20 is arranged at the bottom part of the chain wheel 21.
The main function of the level position stopper 20 is as a permanent stopper for the rotation of the chain wheel 21 in order to maintain the desired level of the buoy 2. The level position stopper 20 has a contact end 20a adapted to bear against the shoulder 22a to prevent the chain 3 from moving in the direction indicated by the arrow A in figure 1. The chain wheel 21 may thus be prevented from movement in this direction by the level position stopper 20.
The level position stopper 20 is further rotatable connected to the inside of the base frame 26 as shown in the figure. The connection part is referred to with reference number 20b and illustrated as a circle in figure 2. At the outside of the base frame 26, there is arranged a second actuation arm 25. The second actuation arm 25 is fixedly attached to the level position stopper 20 and consequently rotatable connected to the base frame 26. The second actuation arm 25 has further a free end 25b adapted to be rotated by a second release mechanism 17. This will be described in greater detail in relation to the functioning.
The level position stopper 20 has further a self-closing device 20c acting to move the contact end 20a into contact with the chain wheel 21 when no force from the second release mechanism 17 is acting. This may for instance be a portion of the level position stopper 20 with increased weight so that the gravitational weight moving the self-closing device 20c downwardly and consequently the contact point 20a upwardly.
A first release mechanism 14 may be arranged on the outside surface of the base frame 26. The first release mechanism 14 may comprise a first release actuator 15 and a first guide 16. The first release actuator 15 and the first guide16 are rotationally connected through a first end 15b of the first release actuator 15 and a point 16b on the first guide16.
The first release mechanism 14 may in one end 15a be rotationally connected to the base frame 26 and in the opposite end 16a rotationally connected to the base frame 26 at a different location. Other arrangement may however be possible as long as the first release mechanism is arranged in a position where it may operate a movement of the jacking arrangement 11 away from the periphery of the chain wheel 21.
In the embodiment show in the figures, the first release actuator 15 is adapted to extend in order to move the first guide 16. The first guide 16 is thus adapted to rotate around an axis in the center position of the end 16a. The positioning of the first release mechanism 14 is further so that the first guide 16 is able to contact and move the first actuation arm 24 when the first actuator 15 extends and consequently the first guide 16 rotates towards the first actuation arm 24. The first guide 16 has preferably a curved surface 16c on the part adapted to contact with the first actuation arm 24.
A second release mechanism 17 is functioning in a similar way as the first release mechanism 14. The second release mechanism 17 is positioned so that it may move or release the level position stopper 20 from the chain wheel 21.
The release mechanism 17 may also be arranged on the outside surface of the base frame 26. The second release mechanism17 comprises in the shown embodiment a second guide 19 and a second release actuator 18.
The second release mechanism 17 is in one end 18a rotationally connected to the base frame 26 and in an opposite end 19a rotationally connected to the rotational arm 23. This will result in that this opposite end 19a will move together with the rotational art 23 when the rotational arm 23 rotates as will be described in further detail under the functioning of the invention.
Another possibility for the movement of the respective first and second actuation arm 24, 25 than by the first and second release mechanism 14, 17, is to provide a hydraulic cylinder between the base frame 26 and the free end 24b, 25b of the first and second actuation arm 24, 25, respectively. In this way the hydraulic cylinder is attached between the base frame 26 and each of the actuation arms 24, 25 to exert a force directly on the actuation arm 24, 25. This embodiment is not shown in the figure.
A possible further embodiment is to attach the an actuator directly between the free end 24b and the rotational arm 23.
The jacking arm actuator 12, the first and second release actuators 15, 19 may be hydraulic cylinders as indicated in the figures. However other actuators for exerting the movement is possible.
Similar as described for the first guide 16, the second guide 19 may have a curved surface 19c in the area that is configured to contacting the second actuation arm 25.
The second release actuator 18 and the second guide 19 are rotationally connected through an end point 18b of the second release actuator 18 and a point 19b on the second guide 19.
The second release actuator 18 is adapted to extend in order to move the second guide 19. The second guide19 is thus adapted to rotate around an axis in the center position of the end 19a.
Figure 4a-11b shows the different steps of the paying out sequence of the sea level compensation system 10 according to the invention.
The figures illustrates one cycle of the paying out sequences. It is of course possible to repeat the sequential steps in a number of cycles until the required amount of the chain or connection line 3 is paid out.
A free end of the contact end 13a of the level compensation arm 13 is adapted to bear against a shoulder 22a in different subsequent positions of the chain wheel 21.
Likewise the contact point 20a of the level position stopper 20 is also adapted to bear against a shoulder 22a in subsequent positions of the chain wheel. This result in that first level compensation arm 13 and the level position stopper 20 may interact with a notch 22 and shoulders of the chain wheel 21 at several position to both move the chain wheel 21 in one direction and also block the movement of the chain wheel 21 in an opposite direction. The movement is described by the following sequential steps.
Figs 4a, 5a, 6a, 7a, 8a, 9a shows the different sequence steps in a cycle without the base frame 26 and the rotational arm 23 similar to the figure 2.
Figure 4b, 5b, 6b, 7b, 8b, 9b shows the correspondent sequence with the base frame 26 and rotational arm 23 similar to the figure 1.
For simplicity, the set of figures a and b with same numbering is positioned in the same sequential step.
Figure 4a, 4b defines the first or initial step. This position corresponds to the position illustrated in figure 1-3. In this position it is the level position stopper 20 that prevents the movement of the chain wheel 21. This is the normal parked position.
In the illustrating example in the figure 4a, 4b, the level compensation arm 13 and the level position stopper 20 are both bearing against the surface of the chain wheel 21.
The level position stopper 20 is bearing against a notch 22 in the chain wheel 21. More specifically the contact point 20a is bearing against the shoulder 22a of the notch 22 to prevent any movement of the chain wheel 21 in the direction indicated by arrow A.
The jacking arm arrangement 11 is in this position in contact with the chain wheel 21 at the surface of the chain wheel 21 at a first position on the periphery of the chain wheel 21. As shown in the figure 4a, 4b the first position is a distance away from the notch 22 and shoulder 22a where the level position stopper 20 is positioned. The jacking arm arrangement 11 is in this position in a retracted position.
Figure 5a, 5b defines a second step. In this step the first release mechanism 14 is moving the jacking arrangement 11 away from the chain wheel 21, while the level position stopper 20 still bear against the shoulder 22a and prevents movement of the chain wheel 21 in the direction indicated by arrow A.
In the example embodiment in the figure, this is performed by extending the first release actuator 15 so that the first guide 16 rotates towards the first actuation arm 24. The first actuation arm 24 will consequently rotate together with the level compensation arm 13 away from the chain wheel 21.
As best shown in figure 5a, the level compensation arm 13 is now free from the chain wheel 21.
Figure 6a, 6b defines a third step where the jacking arrangement 11 is extended and moved to a second position on the periphery of the chain wheel 21, while the level position stopper 20 still bear against the shoulder 22a and prevents movement of the chain wheel 21 in the direction indicated by arrow A.
In the example embodiment of the figures 6a, 6b, this means that the level compensation arm 13 is moved to a subsequently arranged notch 22. This may be performed by the extending the jacking arm actuator 12. The first release mechanism 14 is kept in the extended position from step two. The jacking arrangement 11 is however allowed to move in relation to the first release mechanism 14.
Figure 7a, 7b defines a fourth step where the jacking arm arrangement 11 has reached a shoulder 22a in the subsequent notch 22. In this position feature that prevent the chain wheel 21 from moving in the direction of the arrow A shifts from the level position stopper 20 to the level compensation arm 13.
In the example embodiment of fig 7a, 7b, the jacking arm actuator 12 is moving the contact end 13a of the level compensation arm 13 to a position bearing against the shoulder 22a in the subsequent notch 22. This is defined as the outermost position of the jacking arm arrangement 11.
The chain wheel 21 will be moved slightly in the direction indicated by the arrow B to release the second level position stopper 20 from the shoulder 22a as indicated in the figure 7a.
In addition, as a consequence of the movement of the jacking arrangement 11, the rotational arm 23 rotates around the center axis C. When the jacking arrangement 11 extends to an outermost extended position, the rotational arm 23 results in that the level compensation arm 13 is forced back into contact with the chain wheel 21 as illustrated in figure 7a and 7b.
The end 19a that is connected to the rotational arm 23 will consequently also be moved. The second release mechanism 17 is then brought to a position where the second release actuator 18 is adopted to extend substantially downwardly as illustrated by the figure 7b.
Figure 8a, 8b defines a fifth step where the jacking arrangement 11 is kept in the extended positing and prevent the chain wheel 21 from moving in the direction of the arrow A. The level position stopper 20 is now moved away from the chain wheel 21 by the second release mechanism 17.
This is illustrated in the example embodiment of figure 8a, 8b in that the second release actuator 18 is extended and consequently moves or rotates the second guide 19 and further the second actuation arm 25. The second actuation arm 25 is fixedly connected to the level position stopper 20 and consequently also moves when the second actuation arm 25 moves. As indicated by figure 8a, the level position stopper 20 is now free from the chain wheel 21.
The first release mechanism 14 is at the same time retracted into a initial position.
Figure 9a, 9b defines a sixth step where the jacking arm arrangement 11 being retracted allowing the chain wheel 21 to move along with the jacking arm arrangement 11 in the rotational direction indicated by arrow A.
The jacking arrangement 11 moves the chain wheel 21 a distance when retracting back into the retracted position.
The second release mechanism 17 is then further moved away allowing the level position stopper 20 to move into contact with the chain wheel 21 and provide a stopper for further movement in the direction indicated by arrow A when the jacking arm arrangement 11 is fully retracted.
In the example embodiment, this is performed by moving the jacking arm actuator 12 into a retracted position. The rotational arm 23 is at the same time moved together with the jacking arrangement 11. The second release mechanism 17 will consequently rotate as this is connected to the rotational arm 23 at one end. At the same time the second release actuator 18 is retracted and the second guide 19 is moved away from the second actuation arm 25.
The level position stopper 20 will as a consequence move into contact with the chain wheel 21. The chain wheel 21 will rotate until it bear against the shoulder 22a of the contacting notch 22.
The sea level compensation system 10 has now reached the initial position for repetition of the steps.
Figure 10-14 shows the different steps of the pulling in sequence of the sea level compensation system 10 according to the invention. The figures shows one cycle that may be repeated.
The figures illustrates the sea level compensation system 10 without the rotational arm 23 and the base part 26 on the front side of the chain wheel 21. In these sequential steps the first and second release mechanism 14, 17 are not in use to pull in the connection line or chain 3.
Figure 10 shows the first, initial step of the pulling in sequence. This position resembles the initial position of the payout sequency where the level position stopper 20 bear against the shoulder 22a in the notch 22 to prevent the chain wheel 21 from moving in the direction illustrated by the arrow A.
The first level compensation arm 13 is in in this position contacting the chain wheel 21. The jacking arm arrangement 11 is in a rest position fully retracted.
Figure 11 shows the second sequential step where the jacking arm arrangement 11 is extended. The level compensation arm 13 is in this position moved to a position bearing against the nearby shoulder 22a. The further extension of the jacking arm arrangement 11 rotates the chain wheel 21 further in a direction B as indicated by the arrow B.
Figure 12 shows the third step of the pulling in sequence where the jacking arm arrangement 11 is extended to the maximum possible extension. The chain wheel 21 is also rotated a maximum rotational distance possible performed by one step. The jacking arm arrangement 11 is thus in the outermost position.
Figure 13 shows the fourth step of the pulling in sequence. In this step, the jacking arm arrangement 11 is retracted allowing the chain wheel 21 to rotate slightly in the opposite rotational direction indicated by arrow A. The chain wheel 21 rotation will stop when the level position stopper 20 contacts and bear against a shoulder 22a in a notch 22.
The jacking arrangement 11 moves back into the fully retracted position as illustrated in figure 10.
It is to be noted that the both the pay out and pulling in sequential steps are a continuous procedure that may be repeated as many times as required to pay out or pull in the connection line 3.
Figure list:
10 sea level compensation system
11 jacking arm arrangement
12 jacking arm actuator
12a second end.
12b, 13b first ends
13 level compensation arm
13a contact end.
13c rotational point
14 first release mechanism
15 first release actuator
15, 15b ends
16 first guide
16b rotational point
16a end point
17 second release mechanism
18 second release actuator
19 second guide
19a, 19b ends
19c curved surface
20 level position stopper
20a contact end
20b rotational point
20c self-closing device
21 chain wheel
22 notch in the chain wheel
22a shoulder in notch
23 rotational arm
24 first actuation arm
25 second actuation arm
26 base frame
Technical Field
The invention relates to a sea level compensation system for wave power generators, especially a sea level compensation system that compensate for tidal period and the level of the sea at the different tidal.
Background Art
One of the challenges with sea level compensation of wave power generators is that there is a difference in the sea level caused by tidal periods. This has a great influence on the effect of a wave power generator.
Calculations have proved that the tidal difference could affect the output of the sea level compensation systems considerable.
It is also these areas where it is most interesting to install the sea level compensation systems.
There exist two types of compensators for tidal difference:
a screw type and a cabelar with direct gearbox drive.
There are some characteristics with the known types of compensators.
The screw drive has a stroke length that is limited to the length of the screw. The level is compensated by running the screw up and down.
There are also some challenges with the screw drive. These types are often influenced by wear, growth and corrosion of the screw. This system needs also fine tolerancing of the parts.
There could also be challenges in the load capacity with the screw type system, with challenge due to excessive wave forces.
The cabelar with gearbox system has on the other hand a chain that may be very long where the chain is running up and down.
In this type the wear is not a big issue, but the gearbox and drive need to be calculated according to maximum wave forces. This could again lead to excessive drive units.
The invention is advantage in that it uses a chain jack with mechanical position stopper for sea level compensation.
An object of the present invention is that the drive mechanism is only used for level compensation and does not see the permanent wave loads resulting in less fatigue in the drive mechanism.
Summary of invention
The invention relates to a sea level compensation system for wave power generator comprising a chain wheel. Said system comprises
- a jacking arm arrangement adapted to bear against a periphery of the chain wheel, said jacking arm arrangement further comprises an actuator adapted to move the chain wheel in a first rotational direction and an opposite, second rotational direction,
- a level position stopper adapted to bear against the chain wheel at a different position on the chain wheel than the jacking arm arrangement for preventing rotational movement of the chain wheel.
Preferable embodiments are set out in the dependent claims.
The system may preferably have a base frame where the chain wheel is rotationally connected. This may be a separate frame. However it may also be a part of a larger device to which the compensation system is attached.
The level compensation arm and the level position stopper may be fixedly connected respectively to a first and second actuation arm which may be in direct contact with the respective first and second release mechanism for movement of the level compensation arm and the level position stopper.
The level position stopper may also have a self-closing device or part that enables the level position stopper back into contact with the chain wheel in a self-closing manner.
The invention further relates to the method for paying out the connection line by the sea level compensation. The method comprises the sequential steps of a) moving the jacking arm arrangement away from bearing against the chain wheel,
b) extending the jacking arm arrangement freely from an initial position to an outermost position a distance from of the initial position on the periphery of the chain wheel and moving the jacking arm arrangement into contact with the periphery of the chain wheel,
c) moving the level position stopper away from bearing against the periphery of the chain wheel,
d) retracting the jacking arm arrangement towards the initial position and at the same time allow rotation of the chain wheel in a second rotational direction, allowing the level position stopper to bear against the chain wheel and prevent further rotation of the chain wheel when the jacking arm arrangement has reached the initial position.
Preferably the method comprises a repetition of the steps a) – d) until a suitable amount of the connection line is paid out. A suitable amount typically when the correct height of the buoy is reached as indicated in figure 0.
The invention further relates to a method for pull-in the connection line by a sea level compensation system. The method comprising the steps of
a) moving the chain wheel a distance in a first direction by extending the jacking arm arrangement from an initial position to an outermost position while bearing against the chain wheel,
b) retracting the jacking arm arrangement back to the initial position while preventing the chain wheel from movement in the opposite second direction by the level position stopper.
Preferably the method comprises the repetition of the steps a) – b) until a suitable amount of the connection line (3) is pulled in. As indicated in figure 0 and similar to the payout process, a suitably amount is when the correct height is reached for the buoy.
The invention also relates to a use of the sea level compensation system as a level adjusting device to compensate different tide levels.
Brief description of drawings
The invention is now described by way of example with reference to the accompanying drawings, in which;
Figure 0 shows a principal sketch of a seal level compensation system influenced by different level of tide,
Figure 1 shows the sea level compensation system according to the invention, viewed from the side,
Figure 2a shows a sectional view the sea level compensation system from fig 1, viewed without the pay-out mechanism,
Figure 2b shows a sectional view the sea level compensation system from fig 1, viewed without the pay-out mechanism, but shows the rotational arm, Figure 3 shows a detailed view of the sea level compensation system from fig 1 and 2, illustrating both the outer and interior parts of the system,
Figure 4a and 4b shows a detailed view of the sea level compensation system according to the invention in a first step of the payout sequence,
Figure 5a and 5b shows the sea level compensation system according to the invention in a second step of the payout sequence,
Figure 6a and 6b shows the sea level compensation system according to the invention in a third step of the payout sequence,
Figure 7a and 7b shows the sea level compensation system according to the invention in a fourth step of the payout sequence,
Figure 8a and 8b shows the sea level compensation system according to the invention in a fifth step of the payout sequence,
Figure 9a and 9b shows the sea level compensation system according to the invention in a sixth step of the payout sequence,
Figure 10 shows the sea level compensation system according to the invention in a first step of the pull-in sequence,
Figure 11 shows the sea level compensation system according to the invention in a second step of the pull-in sequence,
Figure 12 shows the sea level compensation system according to the invention in a third step of the pull-in sequence,
Figure 13 shows the sea level compensation system according to the invention in a fourth step of the pull-in sequence,
Detailed description of the invention
Figure 0 shows a principal sketch of wave energy converters 1 which influenced by different level of tides. The sketch is included here to illustrate the purpose of the present invention as a device that pull in and pay out a chain or connecting line 3 to compensate for different heights of the sea level.
The wave energy converter comprises a buoy 2, a connecting line 3 or chain, a funnel 4, an upper end stop 8, a stator 5, a translator 6, a lower end stop 7 and a sea level compensation system 10. The connection line 3 may also be a combination of a chain and a line.
The sea level compensation system 10 is attached to the buoy 2 to adjust the level of the buoy 2. This is performed by paying out and pulling in the connection line 3 and will be described further in the following figures.
Figure 1-3 shows the sea level compensation system 10 according to the invention.
Figure 1 shows the sea level compensation system 10 with a base frame 26 with a first and second release mechanism 14, 17, and a first and second actuation arm 24, 25.
Figure 2 shows the compensation system 10 from figure 1 without a front part of the base frame 26 and a front part of a rotational arm 23. The figure illustrating a level compensation arm 13 and level position stopper 20 in greater detail.
Figure 3 shows both the interior features and the features arranged at the outside of the compensation system 10. The figure also indicates the connection line or chain parts 2 extending around a chain wheel 21.
The sea level compensation system 10 according to the figures 1-3 comprises a chain wheel 21 and a base frame 26. The chain wheel 21 is rotationally connected to the base frame 26. It is further adapted to receive a part of the connection line or chain 3 for movement of the connection line or chain 3 as will be further explained. The sea level compensation system 10 may further comprise a rotational arm 23. The rotational arm 23 and the chain wheel 21 have the same rotational center axis, indicated by C in figure 2b.
Figure 2b shows the sea level compensation system 10 with the rotational arm 23. In this figure a rotational center axis C of the chain wheel and rotational arm 23 is illustrated. It is further clearly shown that both the level compensation arm 13 and the second guide 19 are rotationally connected to the rotational arm 23. This is illustrated by the rotational points 13c and the end 19b.
The chain wheel 21 may comprise a plurality of notches 22 formed as hatches with one side inwardly sloping into the chain wheel 21. The distance between each notch 22 defines the steps of the sea level compensation. The plurality of notches may further have a shoulder 22a disposed in one end. The plurality of notches 22 may be evenly disposed around the periphery of the chain wheel 21. The notches 22 may however be designed differently as long as it provides a part of a stop function on the chain wheel 21 to prevent the chain wheel 21 from rotate in an unwanted direction.
The sea level compensation system 10 further comprises a jacking arm arrangement 11. The jacking arm arrangement 11 may comprise a jacking arm actuator 12 and a level compensation arm 13 rotationally connected together in the respective ends 13b, 12b of the jacking arm actuator 12 and the level compensation arm 13, as shown in the figure 1-3.
The jacking arm arrangement 11 is in an opposite second end 12a rotationally connected to the base frame 26. The opposite contact end 13a of the level compensation arm 13 is adapted to bear against the periphery of the chain wheel 21.
This will result in that the chain wheel 21 is prevented from moving in one direction when the level compensation arm 13 bear against the notch 22 or shoulder 22a of the chain wheel 21.
The level compensation arm 13 may further be fixedly attached to a first actuation arm 24. The first actuation arm 24 may be is arranged on the outside of the rotational arm 23. The rotational arm 23 connecting various part of the sea level compensation system 10, together. The rotational arm 23 may be arranged between the level compensation arm 13 and the first actuation arm 24.
The arrangement with the level compensation arm 13 and the first actuation arm 24 is further rotationally connected to the rotational arm 23. This may be through the a rotational point 13c as indicated in the figure 2.
The first actuation arm 24 has further a free end 24b adapted to be rotated by a first release mechanism 14. The free end 24b has preferably a rounded or curved end surface as shown in the figure. This will be described in greater detail in relation to the functioning of the invention.
A level position stopper 20 is arranged separately from the jacking arm arrangement 11. The level position stopper 20 has a contacting end 20a adapted to bear against the chain wheel 21 at a different notch 22 position than the level compensation arm 13. This is illustrated in the figures where the level compensation arm 13 is arranged on one side of the chain wheel 21, while the level position stopper 20 is arranged at the bottom part of the chain wheel 21.
The main function of the level position stopper 20 is as a permanent stopper for the rotation of the chain wheel 21 in order to maintain the desired level of the buoy 2. The level position stopper 20 has a contact end 20a adapted to bear against the shoulder 22a to prevent the chain 3 from moving in the direction indicated by the arrow A in figure 1. The chain wheel 21 may thus be prevented from movement in this direction by the level position stopper 20.
The level position stopper 20 is further rotatable connected to the inside of the base frame 26 as shown in the figure. The connection part is referred to with reference number 20b and illustrated as a circle in figure 2. At the outside of the base frame 26, there is arranged a second actuation arm 25. The second actuation arm 25 is fixedly attached to the level position stopper 20 and consequently rotatable connected to the base frame 26. The second actuation arm 25 has further a free end 25b adapted to be rotated by a second release mechanism 17. This will be described in greater detail in relation to the functioning.
The level position stopper 20 has further a self-closing device 20c acting to move the contact end 20a into contact with the chain wheel 21 when no force from the second release mechanism 17 is acting. This may for instance be a portion of the level position stopper 20 with increased weight so that the gravitational weight moving the self-closing device 20c downwardly and consequently the contact point 20a upwardly.
A first release mechanism 14 may be arranged on the outside surface of the base frame 26. The first release mechanism 14 may comprise a first release actuator 15 and a first guide 16. The first release actuator 15 and the first guide16 are rotationally connected through a first end 15b of the first release actuator 15 and a point 16b on the first guide16.
The first release mechanism 14 may in one end 15a be rotationally connected to the base frame 26 and in the opposite end 16a rotationally connected to the base frame 26 at a different location. Other arrangement may however be possible as long as the first release mechanism is arranged in a position where it may operate a movement of the jacking arrangement 11 away from the periphery of the chain wheel 21.
In the embodiment show in the figures, the first release actuator 15 is adapted to extend in order to move the first guide 16. The first guide 16 is thus adapted to rotate around an axis in the center position of the end 16a. The positioning of the first release mechanism 14 is further so that the first guide 16 is able to contact and move the first actuation arm 24 when the first actuator 15 extends and consequently the first guide 16 rotates towards the first actuation arm 24. The first guide 16 has preferably a curved surface 16c on the part adapted to contact with the first actuation arm 24.
A second release mechanism 17 is functioning in a similar way as the first release mechanism 14. The second release mechanism 17 is positioned so that it may move or release the level position stopper 20 from the chain wheel 21.
The release mechanism 17 may also be arranged on the outside surface of the base frame 26. The second release mechanism17 comprises in the shown embodiment a second guide 19 and a second release actuator 18.
The second release mechanism 17 is in one end 18a rotationally connected to the base frame 26 and in an opposite end 19a rotationally connected to the rotational arm 23. This will result in that this opposite end 19a will move together with the rotational art 23 when the rotational arm 23 rotates as will be described in further detail under the functioning of the invention.
Another possibility for the movement of the respective first and second actuation arm 24, 25 than by the first and second release mechanism 14, 17, is to provide a hydraulic cylinder between the base frame 26 and the free end 24b, 25b of the first and second actuation arm 24, 25, respectively. In this way the hydraulic cylinder is attached between the base frame 26 and each of the actuation arms 24, 25 to exert a force directly on the actuation arm 24, 25. This embodiment is not shown in the figure.
A possible further embodiment is to attach the an actuator directly between the free end 24b and the rotational arm 23.
The jacking arm actuator 12, the first and second release actuators 15, 19 may be hydraulic cylinders as indicated in the figures. However other actuators for exerting the movement is possible.
Similar as described for the first guide 16, the second guide 19 may have a curved surface 19c in the area that is configured to contacting the second actuation arm 25.
The second release actuator 18 and the second guide 19 are rotationally connected through an end point 18b of the second release actuator 18 and a point 19b on the second guide 19.
The second release actuator 18 is adapted to extend in order to move the second guide 19. The second guide19 is thus adapted to rotate around an axis in the center position of the end 19a.
Figure 4a-11b shows the different steps of the paying out sequence of the sea level compensation system 10 according to the invention.
The figures illustrates one cycle of the paying out sequences. It is of course possible to repeat the sequential steps in a number of cycles until the required amount of the chain or connection line 3 is paid out.
A free end of the contact end 13a of the level compensation arm 13 is adapted to bear against a shoulder 22a in different subsequent positions of the chain wheel 21.
Likewise the contact point 20a of the level position stopper 20 is also adapted to bear against a shoulder 22a in subsequent positions of the chain wheel. This result in that first level compensation arm 13 and the level position stopper 20 may interact with a notch 22 and shoulders of the chain wheel 21 at several position to both move the chain wheel 21 in one direction and also block the movement of the chain wheel 21 in an opposite direction. The movement is described by the following sequential steps.
Figs 4a, 5a, 6a, 7a, 8a, 9a shows the different sequence steps in a cycle without the base frame 26 and the rotational arm 23 similar to the figure 2.
Figure 4b, 5b, 6b, 7b, 8b, 9b shows the correspondent sequence with the base frame 26 and rotational arm 23 similar to the figure 1.
For simplicity, the set of figures a and b with same numbering is positioned in the same sequential step.
Figure 4a, 4b defines the first or initial step. This position corresponds to the position illustrated in figure 1-3. In this position it is the level position stopper 20 that prevents the movement of the chain wheel 21. This is the normal parked position.
In the illustrating example in the figure 4a, 4b, the level compensation arm 13 and the level position stopper 20 are both bearing against the surface of the chain wheel 21.
The level position stopper 20 is bearing against a notch 22 in the chain wheel 21. More specifically the contact point 20a is bearing against the shoulder 22a of the notch 22 to prevent any movement of the chain wheel 21 in the direction indicated by arrow A.
The jacking arm arrangement 11 is in this position in contact with the chain wheel 21 at the surface of the chain wheel 21 at a first position on the periphery of the chain wheel 21. As shown in the figure 4a, 4b the first position is a distance away from the notch 22 and shoulder 22a where the level position stopper 20 is positioned. The jacking arm arrangement 11 is in this position in a retracted position.
Figure 5a, 5b defines a second step. In this step the first release mechanism 14 is moving the jacking arrangement 11 away from the chain wheel 21, while the level position stopper 20 still bear against the shoulder 22a and prevents movement of the chain wheel 21 in the direction indicated by arrow A.
In the example embodiment in the figure, this is performed by extending the first release actuator 15 so that the first guide 16 rotates towards the first actuation arm 24. The first actuation arm 24 will consequently rotate together with the level compensation arm 13 away from the chain wheel 21.
As best shown in figure 5a, the level compensation arm 13 is now free from the chain wheel 21.
Figure 6a, 6b defines a third step where the jacking arrangement 11 is extended and moved to a second position on the periphery of the chain wheel 21, while the level position stopper 20 still bear against the shoulder 22a and prevents movement of the chain wheel 21 in the direction indicated by arrow A.
In the example embodiment of the figures 6a, 6b, this means that the level compensation arm 13 is moved to a subsequently arranged notch 22. This may be performed by the extending the jacking arm actuator 12. The first release mechanism 14 is kept in the extended position from step two. The jacking arrangement 11 is however allowed to move in relation to the first release mechanism 14.
Figure 7a, 7b defines a fourth step where the jacking arm arrangement 11 has reached a shoulder 22a in the subsequent notch 22. In this position feature that prevent the chain wheel 21 from moving in the direction of the arrow A shifts from the level position stopper 20 to the level compensation arm 13.
In the example embodiment of fig 7a, 7b, the jacking arm actuator 12 is moving the contact end 13a of the level compensation arm 13 to a position bearing against the shoulder 22a in the subsequent notch 22. This is defined as the outermost position of the jacking arm arrangement 11.
The chain wheel 21 will be moved slightly in the direction indicated by the arrow B to release the second level position stopper 20 from the shoulder 22a as indicated in the figure 7a.
In addition, as a consequence of the movement of the jacking arrangement 11, the rotational arm 23 rotates around the center axis C. When the jacking arrangement 11 extends to an outermost extended position, the rotational arm 23 results in that the level compensation arm 13 is forced back into contact with the chain wheel 21 as illustrated in figure 7a and 7b.
The end 19a that is connected to the rotational arm 23 will consequently also be moved. The second release mechanism 17 is then brought to a position where the second release actuator 18 is adopted to extend substantially downwardly as illustrated by the figure 7b.
Figure 8a, 8b defines a fifth step where the jacking arrangement 11 is kept in the extended positing and prevent the chain wheel 21 from moving in the direction of the arrow A. The level position stopper 20 is now moved away from the chain wheel 21 by the second release mechanism 17.
This is illustrated in the example embodiment of figure 8a, 8b in that the second release actuator 18 is extended and consequently moves or rotates the second guide 19 and further the second actuation arm 25. The second actuation arm 25 is fixedly connected to the level position stopper 20 and consequently also moves when the second actuation arm 25 moves. As indicated by figure 8a, the level position stopper 20 is now free from the chain wheel 21.
The first release mechanism 14 is at the same time retracted into a initial position.
Figure 9a, 9b defines a sixth step where the jacking arm arrangement 11 being retracted allowing the chain wheel 21 to move along with the jacking arm arrangement 11 in the rotational direction indicated by arrow A.
The jacking arrangement 11 moves the chain wheel 21 a distance when retracting back into the retracted position.
The second release mechanism 17 is then further moved away allowing the level position stopper 20 to move into contact with the chain wheel 21 and provide a stopper for further movement in the direction indicated by arrow A when the jacking arm arrangement 11 is fully retracted.
In the example embodiment, this is performed by moving the jacking arm actuator 12 into a retracted position. The rotational arm 23 is at the same time moved together with the jacking arrangement 11. The second release mechanism 17 will consequently rotate as this is connected to the rotational arm 23 at one end. At the same time the second release actuator 18 is retracted and the second guide 19 is moved away from the second actuation arm 25.
The level position stopper 20 will as a consequence move into contact with the chain wheel 21. The chain wheel 21 will rotate until it bear against the shoulder 22a of the contacting notch 22.
The sea level compensation system 10 has now reached the initial position for repetition of the steps.
Figure 10-14 shows the different steps of the pulling in sequence of the sea level compensation system 10 according to the invention. The figures shows one cycle that may be repeated.
The figures illustrates the sea level compensation system 10 without the rotational arm 23 and the base part 26 on the front side of the chain wheel 21. In these sequential steps the first and second release mechanism 14, 17 are not in use to pull in the connection line or chain 3.
Figure 10 shows the first, initial step of the pulling in sequence. This position resembles the initial position of the payout sequency where the level position stopper 20 bear against the shoulder 22a in the notch 22 to prevent the chain wheel 21 from moving in the direction illustrated by the arrow A.
The first level compensation arm 13 is in in this position contacting the chain wheel 21. The jacking arm arrangement 11 is in a rest position fully retracted.
Figure 11 shows the second sequential step where the jacking arm arrangement 11 is extended. The level compensation arm 13 is in this position moved to a position bearing against the nearby shoulder 22a. The further extension of the jacking arm arrangement 11 rotates the chain wheel 21 further in a direction B as indicated by the arrow B.
Figure 12 shows the third step of the pulling in sequence where the jacking arm arrangement 11 is extended to the maximum possible extension. The chain wheel 21 is also rotated a maximum rotational distance possible performed by one step. The jacking arm arrangement 11 is thus in the outermost position.
Figure 13 shows the fourth step of the pulling in sequence. In this step, the jacking arm arrangement 11 is retracted allowing the chain wheel 21 to rotate slightly in the opposite rotational direction indicated by arrow A. The chain wheel 21 rotation will stop when the level position stopper 20 contacts and bear against a shoulder 22a in a notch 22.
The jacking arrangement 11 moves back into the fully retracted position as illustrated in figure 10.
It is to be noted that the both the pay out and pulling in sequential steps are a continuous procedure that may be repeated as many times as required to pay out or pull in the connection line 3.
Figure list:
10 sea level compensation system 11 jacking arm arrangement 12 jacking arm actuator
12a second end.
12b, 13b first ends
13 level compensation arm
13a contact end.
13c rotational point
14 first release mechanism
15 first release actuator
15, 15b ends
16 first guide
16b rotational point
16a end point
17 second release mechanism 18 second release actuator
19 second guide
19a, 19b ends
19c curved surface
20 level position stopper
20a contact end
20b rotational point
20c self-closing device
21 chain wheel
22 notch in the chain wheel 22a shoulder in notch 23 rotational arm
24 first actuation arm 25 second actuation arm 26 base frame
Claims (14)
1. 1. A sea level compensation system for wave power generator (10) comprising a chain wheel (21), characterised in that said system comprises
- a jacking arm arrangement (11) adapted to bear against a periphery of the chain wheel (21), said jacking arm arrangement (11) further comprises an actuator (12) adapted to move the chain wheel (21) in a first rotational direction (B) and an opposite, second rotational direction (A),
- a level position stopper (20) adapted to bear against the chain wheel (21) at a different position on the chain wheel (21) than the jacking arm arrangement (11) for preventing rotational movement of the chain wheel (21).
2. The level compensation system according to claim 1, wherein said system further comprises a first release mechanism (14) operationally connected to the jacking arm arrangement (11) and/or the level position stopper (20) adapted to move the jacking arm arrangement (11) and/or the level position stopper (20) away from the chain wheel (21).
3. The level compensation system according to claim 2, wherein the system comprises a second release mechanism (17) operationally connected to the other of the jacking arm arrangement (11) or the level position stopper (20) for independently movement of the jacking arm arrangement (11) and the level position stopper (20) away from the chain wheel (21)
4. The sea level compensation system according to any of the claims 1-3, wherein the jacking arm arrangement (11) and the level position stopper (20) are respectively adapted to bear against a notch (22) of a plurality of notches (22) formed in the outer periphery of the chain wheel (21), said plurality of notches (22) being designed to prevent movement of the chain wheel (21) in the second rotational direction (A) when said jacking arm arrangement (11) or level positioning stopper (20) is contacting the notch (22) of the plurality of notches (22).
5. The sea level compensation system according to any one of the claims 1-4, wherein the jacking arm arrangement (11) further comprises a level compensation arm (13) attached to the jacking arm actuator (12) in one end and adapted to bear against the chain wheel (21) in the opposite end, said jacking arm actuator (12) is adapted to exert a force on the level compensation arm (13) for movement of the chain wheel (21) a distance in the first rotational direction (B) and/or position the level compensation arm (13) in an adjacently arranged notch (22) of the chain wheel (21) for movement of the chain wheel (21) a distance in the second rotational direction (A).
6. The sea level compensation system according to any one of claims 2-5, wherein the first release mechanism (14) comprises a first guide (16) and a first release actuator (15) rotationally connected to the first guide (16), said first release actuator (15) is adapted to exert a force on the first guide (16) to move the level compensation arm (13) away from a position bearing against the chain wheel (21).
7. The sea level compensation system according to any one of claims 3-6, wherein the second release mechanism (17) comprises a second guide (19) and a second guide actuator (18) rotationally connected to the second guide (19), said second hydraulic actuator (18) is adapted to exert a force on the second guide (19) to move the level position stopper (20) away from a position bearing against the chain wheel (21).
8. The sea level compensation system according to any one of the claims 1-7, wherein the system further comprising a rotational arm (23) arranged to have a same rotational axis (C) as the chain wheel (21), said rotational arm (23) is rotationally connected to the jacking arm arrangement (11) for guiding the jacking arm arrangement (11) towards the chain wheel (21).
9. The sea level compensation system according to any of the claims 2-8, wherein the rotational arm (23) is further rotationally connected to the second release mechanism (17) and/or the first release mechanism (14).
10. A method for paying out the connection line (3) by the sea level compensation system (10) according to any one of the claims 1-9, wherein the method comprises the sequential steps of
a) moving the jacking arm arrangement (11) away from bearing against the chain wheel (21),
b) extending the jacking arm arrangement (11) freely from an initial position to an outermost position a distance from of the initial position on the periphery of the chain wheel (21) and moving the jacking arm arrangement (11) into contact with the periphery of the chain wheel (21),
c) moving the level position stopper (20) away from bearing against the periphery of the chain wheel (21)
d) retracting the jacking arm arrangement (11) towards the initial position and at the same time allow rotation of the chain wheel (21) in a second rotational direction (A),
-allowing the level position stopper (20) to bear against the chain wheel (21) and prevent further rotation of the chain wheel (21) when the jacking arm arrangement (11) has reached the initial position.
11. The method according to claim 10, wherein the method comprises a repetition of the steps a) – d) until a suitable amount of the connection line (3) is paid out.
12. A method for pull-in the connection line by a sea level compensation system according to any one of the claims 1-9, wherein the method comprising the steps of
a) moving the chain wheel (21) a distance in a first direction (B) by extending the jacking arm arrangement (11) from an initial position to an outermost position while bearing against the chain wheel (21), b) retracting the jacking arm arrangement (11) back to the initial position while preventing the chain wheel (21) from movement in the opposite second direction (A) by the level position stopper (20).
13. The method according to claim 12, wherein the method comprises the repetition of the steps a) – b) until a suitable amount of the connection line (3) is pulled in.
14. A use of the sea level compensation system according to any one of the claims 1-9, as a level adjusting device to compensate different tide levels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20210522A NO20210522A1 (en) | 2021-04-28 | 2021-04-28 | Sea level compensation system for wave energy compensators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20210522A NO20210522A1 (en) | 2021-04-28 | 2021-04-28 | Sea level compensation system for wave energy compensators |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NO346449B1 true NO346449B1 (en) | 2022-08-22 |
| NO20210522A1 NO20210522A1 (en) | 2022-08-22 |
Family
ID=83188076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO20210522A NO20210522A1 (en) | 2021-04-28 | 2021-04-28 | Sea level compensation system for wave energy compensators |
Country Status (1)
| Country | Link |
|---|---|
| NO (1) | NO20210522A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4228360A (en) * | 1979-06-08 | 1980-10-14 | Pablo Navarro | Wave motion apparatus |
| WO2010067341A2 (en) * | 2008-12-11 | 2010-06-17 | Fobox As | A wave power plant |
| GB2479348A (en) * | 2010-04-06 | 2011-10-12 | Richard Ainsley Page | Wave power converter with one way clutch |
| US20190085816A1 (en) * | 2016-03-25 | 2019-03-21 | Ingine, Inc. | Uniaxial power converting apparatus |
-
2021
- 2021-04-28 NO NO20210522A patent/NO20210522A1/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4228360A (en) * | 1979-06-08 | 1980-10-14 | Pablo Navarro | Wave motion apparatus |
| WO2010067341A2 (en) * | 2008-12-11 | 2010-06-17 | Fobox As | A wave power plant |
| GB2479348A (en) * | 2010-04-06 | 2011-10-12 | Richard Ainsley Page | Wave power converter with one way clutch |
| US20190085816A1 (en) * | 2016-03-25 | 2019-03-21 | Ingine, Inc. | Uniaxial power converting apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| NO20210522A1 (en) | 2022-08-22 |
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