CN110529330B - Wave energy power generation system - Google Patents
Wave energy power generation system Download PDFInfo
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- CN110529330B CN110529330B CN201910833378.2A CN201910833378A CN110529330B CN 110529330 B CN110529330 B CN 110529330B CN 201910833378 A CN201910833378 A CN 201910833378A CN 110529330 B CN110529330 B CN 110529330B
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- 238000010248 power generation Methods 0.000 title claims abstract description 60
- 230000033001 locomotion Effects 0.000 claims abstract description 65
- 238000013016 damping Methods 0.000 claims abstract description 53
- 238000007667 floating Methods 0.000 claims abstract description 51
- 230000007246 mechanism Effects 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 230000009471 action Effects 0.000 claims abstract description 16
- 238000013461 design Methods 0.000 claims abstract description 7
- 230000003068 static effect Effects 0.000 claims abstract description 6
- 230000002195 synergetic effect Effects 0.000 claims abstract description 3
- 230000005484 gravity Effects 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000012423 maintenance Methods 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 239000013535 sea water Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000002079 cooperative effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 241000271901 Pelamis Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
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- 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
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
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- 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"
- F03B13/20—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" wherein both members, i.e. wom and rem are movable relative to the sea bed or shore
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- 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
- Y02E10/20—Hydro energy
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- 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)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
The invention discloses a wave energy power generation system which comprises a wave energy absorbing and converting device and a power generation mechanism. The wave energy absorbing and converting device comprises a floating body, a damping disc, a guide shaft and a counterbalance mechanism. The counter force of the counter mechanism is opposite to the natural motion direction of the damping disc, so that the damping disc keeps a relatively static state in water under the synergistic effect of the counter mechanism, and the counter force is not contacted with a limiting structure or a floating body or a part integrally moving with the floating body in the wave height range of the system design. When the floating body is driven to move up and down together with the guide shaft under the action of waves, relative motion is generated between the floating body and the damping disc, and the power generation mechanism receives power output by the relative motion and converts wave energy into electric energy. The invention has the advantages of high wave energy utilization rate, simple structure, reliable operation, strong wind and wave resistance, strong corrosion resistance, simple maintenance and the like, and can reduce the power generation cost of wave energy.
Description
Technical Field
The invention relates to a power generation technology, in particular to a wave energy power generation technology.
Background
Currently, wave energy power generation devices generally adopt the following modes:
1. Wave energy is converted into hydraulic energy, so that a turbine connected with the generator is pushed to rotate, and the generator is further enabled to rotate to generate electricity. Such as scotch Pelamis wave energy power plants and the american Ocean Power Technology (OPT) OPT wave power plants. However, the wave energy power generation device adopting the structure has relatively complex design, high manufacturing cost and high maintenance cost, and has no cost advantage compared with the prior dominant thermal power generation and hydroelectric power generation.
2. The wave energy is converted into flowing compressed air to drive the turbine to rotate, so that the generator rotates to generate electricity, namely oscillating water column type electricity generation. The power generation facility mainly takes the shore type as a main part, and has the advantages of simple structure, reliable performance and low maintenance cost. But the energy conversion efficiency is lower, the construction is greatly limited by geographical positions, and the popularization is not facilitated. The offshore floating oscillating water column power generation equipment is most typical of megawhales which are practically used in Japan, avoids the geographical limitation of shore-type facilities, but has relatively high manufacturing cost and still has no cost advantage compared with thermal power and hydroelectric power.
3. The wave energy is converted into mechanical energy, and the generator is directly pushed to rotate for power generation. In theory, the mode avoids energy loss in the conversion process because of no multiple conversion in the energy transmission form, and the energy conversion rate is higher than that of the wave energy power generation device in the two forms. However, due to the complexity of wave motion and the impact of billows caused by extreme weather, the reliability of the system is greatly reduced, so that the wave power generation device is difficult to cope with extreme ocean conditions, and thus no fully mature equipment application exists.
Among the three modes, the direct utilization of the seawater impulse turbine for power generation is a theoretical ideal mode, the intermediate links of energy absorption and transmission can be reduced, and the utilization rate of wave energy is improved. In a common method, sea water is injected into a water reservoir on the shore by pushing a hydraulic pump or a piston by waves, and the water turbine generates electricity by using the formed fall. Or the wave is introduced into a higher place by utilizing a shrinkage water channel mode, the fall is formed, and the water turbine is utilized for generating electricity. The disadvantage of the former two approaches is that the collection of wave energy is very close offshore, which is greatly affected by geographical location.
There is also a floating power generation device at sea, such as WaveEL wave power generation device in sweden, which adopts a tubular body of about 20m length connected with a floating body and extends vertically into the sea, so that the sea water level inside the tubular body is kept at a relatively stable level without being influenced by the wave outside the pipe, a water turbine is connected with the tubular body and moves up and down along with the floating body along with the wave, and the blades of the water turbine rotate in the sea water inside the tubular body to drive a generator to generate power. The device has the advantages of simple structure, strong reliability, full sealing state, strong wind and wave resistance and corrosion resistance because most structures are underwater, and low utilization rate of wave energy because the device only uses the inertia of the internal seawater to do work and is related to the size of the blades of the water turbine.
The present inventors have previously invented two wave power generation devices, see chinese patent documents CN103939270B and CN103939269a, whose structures are seen in fig. 1 and 2, which include a generator mounted in a floating body, and a water turbine connected to the generator in the floating body through an energy output shaft. The piston supercharging device is arranged below the floating body, when the floating body drives the piston sleeve and the central guide shaft to move up and down along with waves, the piston keeps a relatively static state in water due to inertia and resistance, so that the piston and the piston sleeve form relative movement, alternating positive pressure and negative pressure are formed on the seawater in the inner cavity of the piston sleeve, the seawater flows back and forth in the running water channel, the back and forth impact on the blades of the water turbine in the running water channel is realized, and the rotating blades drive the generator to generate electricity. The power generation device solves the problems of complex structure, high manufacturing cost and maintenance cost and low reliability of long-term operation of the existing wave power generation device.
This device is possible in principle, but does have problems in practical operation: since the device is designed with the resistance disc under water, according to the design scheme, the buoyancy of the resistance disc is equal to the gravity to ensure that the resistance disc floats in the middle of a movement interval, but the device is only ideal, and in fact, the resistance disc with the buoyancy equal to the gravity cannot be manufactured, and the position of the resistance disc under water is uncontrollable even if the buoyancy of the resistance disc is equal to the gravity. Therefore, in practical situations, the resistance disc always has a tendency to move upwards or downwards due to self gravity or buoyancy, the resistance disc cannot move to one end of a movement section automatically at a designed middle position, so that when waves drive the floating body to move up and down, the resistance disc cannot avoid contact and collision with the limiting structure or the lower end of the piston cylinder in each movement period, the contact causes that the piston and the cylinder lose relative movement for a period of time, wave energy cannot be absorbed, and the effect of capturing wave energy is lost. In practical operation experiments, the applicant finds that each wave motion period is about 7 seconds, and the time for losing the relative motion due to the contact of the resistance disc and the limiting structure is about 3 seconds, so that the repeated stopping and starting of the generator is caused, and the power generation efficiency of the device is greatly reduced. The applicant has found that, compared with the theoretical design state, the efficiency of the device is reduced by about 80%, the measured voltage output is shown in fig. 3, and the voltage output from the device is from 0 to 648.2V, which is intermittent and discontinuous, so that the rectification inversion is difficult to carry out, and therefore, the electric energy obtained by the device is difficult to use, and the device is difficult to be practically applied.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a wave energy power generation system which improves the utilization rate of wave energy.
The technical scheme adopted for realizing the aim of the invention is as follows:
The invention provides a wave energy power generation system which comprises a wave energy absorbing and converting device and a power generation mechanism. The wave energy absorbing and converting device comprises a floating body, a resistance disc and a guide shaft. The guide shaft is connected to the bottom of the floating body, the resistance disc is sleeved on the guide shaft in a relatively movable manner, and a limiting structure is arranged above and/or below the resistance disc to limit the movement range of the resistance disc; when the floating body is under the action of waves, the guide shaft is driven to move up and down together, so that relative movement is generated between the guide shaft and the resistance disc, and mechanical kinetic energy is output to the power generation mechanism.
The invention is improved in that a counterbalance mechanism is arranged at or near the middle position of the resistance disc movement section to counterbalance the upward or downward movement trend of the resistance disc; the counter force of the counter-balancing mechanism is the gravity of the counter weight or the buoyancy of the buoyancy tank, and the counter-balancing force is opposite to the natural movement direction of the resistance disc. When the resistance disc is in contact with the counter balancing mechanism upwards or downwards, the resistance disc stays at the position just contacted with the counter balancing mechanism under the action of no external force, the resistance disc can not automatically move upwards and downwards, under the action of waves, the floating body drives the guide shaft to move together with the resistance disc to generate relative motion, the motion interval of the resistance disc is between the upper limiting structure and the lower limiting structure, the resistance disc keeps a relatively static state in water under the cooperative action of the counter balancing mechanism through the self resistance action, and in the designed working wave height range, the damping disc moves in the area taking the contact point as the core, and the upper part and the lower part are prevented from touching the limiting structure or the floating body or the part integrally moving along with the floating body.
In the invention, the power generation mechanism is an oil pump hydraulic motor power generation device and comprises a hydraulic pump, a hydraulic motor and a power generator which are arranged in a floating body. The push rod of the hydraulic pump is connected with the damping disc through the transmission part, under the action of waves, the floating body and the damping disc generate relative motion, and the generated power pushes the internal piston of the hydraulic pump to move through the transmission part and the push rod, so that the liquid in the hydraulic pump pushes the hydraulic motor, and the generator is driven to generate electricity.
In this solution, when the buoyancy of the resistance disc is designed to be greater than its own and the weight that it carries (here, the weight of all the structures that are connected to the damping disc), the weight is loaded on the resistance disc such that the sum of the weights carried by the resistance disc plus the weight is greater than the sum of their buoyancy. After the resistance disc moves from the lower end to the upper end of the movement section to the middle area of the movement section and is combined with the counterweight, the combination is not firm and only close together, if no external force acts, the combination stays at the original combination position, and under the action of the external force, the combination body can continuously move upwards, but because the gravity of the combination body is larger than the buoyancy, the natural movement trend of the combination body becomes downward, the rising kinetic energy of the combination body is weakened, the contact of the resistance disc with the upper limit structure or the floating body or the part integrally moving with the floating body is avoided in a certain wave range, the downward movement is started before the contact, and when the combination body moves downwards to the original combination position, the resistance disc and the counterweight are naturally separated.
In this solution, when the weight of the load of the resistance disc is designed to be greater than its buoyancy, the buoyancy tanks are loaded on the resistance disc such that the sum of the buoyancy forces of the resistance disc plus the buoyancy tanks is greater than the sum of the weight forces of them. When the resistance disc moves from the upper end to the lower end of the movement section to the middle area, the resistance disc is combined with the buoyancy tank, and if no external force acts, the combined body stays at the initial combined position. Under the action of external force, the combined body can continuously move downwards together, but because the buoyancy of the combined body is larger than the gravity, the natural movement trend of the combined body is changed into upwards, the kinetic energy of the downward movement of the combined body is weakened, and in a certain wave range, the damping disc avoids the contact of the resistance disc below and the lower limiting structure or the part integrally moving along with the floating body, and the combined body can start to move upwards before being contacted. When the combined body moves upwards to the initial combined position, the resistance disc is naturally separated from the buoyancy tank.
Further, in the present invention, when the weight is loaded on the resistance disc, the weight is suspended above the resistance disc by a soft chain, which is connected to the guide shaft or a part which moves integrally with the guide shaft, in the middle region of the movement section of the resistance disc. The flexible chain may be of any length, preferably of a length such that the counterweight is in a position intermediate the resistance disc movement zones. This counterweight connection is one of the options of the present invention and is not the only option.
When the buoyancy tank is configured for the resistance disc, the buoyancy tank is connected below the resistance disc by soft chain traction, and the buoyancy tank is suspended below the resistance disc under the downward traction action of the soft chain, and the soft chain is connected to the guide shaft or a part which is integrated with the guide shaft and moves together. The flexible chain may be of any length, preferably of a length such that the buoyancy tank is in a position intermediate the resistance disc movement zones. The buoyancy tank connection mode is one of the choices of the invention and is not the only choice.
In the invention, the limiting structure can be a structure arranged at the upper part and/or the lower part of the guide shaft, or a part of a part integrally connected and fixed with the guide shaft or the floating body is used as the limiting structure, and the structure and the part are positioned above and/or below the damping disc to limit the movement range of the damping disc in the state of not loading the counter balancing mechanism.
As can be seen from the above description, the invention designs a power generation system with high wave energy utilization rate, wherein a force which is opposite to the buoyancy or gravity of the resistance disc is loaded at the middle position of the motion of the resistance disc, so that when the resistance disc moves to the position due to the buoyancy or gravity of the resistance disc, the opposite force is loaded to prevent the resistance disc from moving by itself, and hovers at the place where the opposite force is loaded, wherein the place is usually at the middle area of the motion interval. Because the counter balance mechanism exists, the resistance disc loses the natural power of moving towards the two ends of the movement interval, so when waves drive the floating body and the guide shaft to move, as long as the wave height is within the designed range, the damping disc can move up and down around the core by taking the contact point with the counter balance mechanism as the core, and the collision and contact between the resistance disc and the limiting structure can be avoided, so that the relative movement between the floating body and the resistance disc is always kept, and the wave energy is not intermittently absorbed to convert the wave energy.
The invention has the advantages of high wave energy utilization rate, simple structure, reliable operation, strong wind and wave resistance, strong corrosion resistance, simple maintenance and the like, can reduce the power generation cost of wave energy, increase the competitiveness of the wave energy with the traditional energy production, and can solve the power supply of offshore remote island reefs and the power consumption requirements of sea water desalination.
Drawings
FIG. 1 is a diagram of a wave power plant of the prior art (CN 103939270A)
FIG. 2 is a diagram of a wave power plant of the prior art (CN 103939269B)
FIG. 3 is a graph of the voltage output of a wave energy power plant of the prior art (CN 103939270A);
FIG. 4 is a voltage output graph of the wave energy absorbing and conversion device of the present invention;
FIG. 5 is a schematic diagram of one embodiment of the present invention;
FIG. 6 is a schematic diagram of the structural principle of the present invention employing a multi-stage counterbalance mechanism;
FIG. 7 is a schematic diagram of the structural principle of the present invention employing a hybrid multi-stage counterbalance mechanism.
In the figure: 1. the hydraulic power generation device comprises a floating body, 2, a generator, 3, a transmission rod, 4, a water turbine, 5, a guide shaft, 9, a resistance disc, 10, a central shaft sleeve, 11a, an upper limiting structure, 11b, a lower limiting structure, 12, a guide groove, 13, a power generation mechanism, 14a, a counterweight, 14b, a buoyancy tank, 15, a push rod, 16, a hydraulic pump, 17 and a hydraulic motor.
Detailed Description
The invention will be further illustrated by the following, in connection with the accompanying drawings and a number of non-limiting examples:
example 1:
Referring to fig. 5, in the present embodiment, the wave power generation system is constituted by a wave energy absorbing and converting device and a power generation mechanism.
In this embodiment, the wave energy absorbing and converting device comprises a floating body 1, a resistance disc 9, a guide shaft 5, a counterbalance mechanism and other components. The guide shaft 5 is connected to the bottom of the floating body 1, the guide shaft 5 vertically penetrates through the center of the resistance disc 9, and the resistance disc can freely slide on the guide shaft 5. The upper and lower parts of the guide shaft 5 are provided with limiting structures 11a and 11b, and the movement range of the limiting resistance disc 9 is between the two limiting structures 11a and 11 b. When the floating body 1 is under the wave action, the guiding shaft 5 is driven to move up and down together, so that relative movement is generated between the guiding shaft and the resistance disc 9, and mechanical kinetic energy is output to the power generation mechanism.
In this embodiment, the power generation mechanism is an oil pump hydraulic motor power generation device including a hydraulic pump 16, a hydraulic motor 17 and a generator 2 mounted in the floating body 1. The push rod 15 of the hydraulic pump 16 is connected with the damping disk 9 through the transmission rod 3, under the action of waves, the floating body 1 and the damping disk 9 generate relative motion, the transmission rod 3 and the push rod 15 push the internal piston of the hydraulic pump 16 to move, and the liquid in the hydraulic pump flows through the hydraulic motor 17 to drive the generator 2 to generate electricity
In this embodiment, a counter-balancing mechanism is provided at or near the middle position of the movement section of the resistance disc 9 to counter the upward or downward movement tendency of the resistance disc. The counter force of the counter mechanism is derived from the weight of the specifically provided counterweight 14a or the buoyancy of the buoyancy tank 14 b. In this embodiment, since the buoyancy force of the resistance disc 9 added with the load (such as the pushing rod 15) is about less than the sum of gravity, the buoyancy tank 14b is configured below the resistance disc 9, and the counter force is opposite to the natural motion direction of the resistance disc 9, so that the resistance disc 9 keeps a relatively static state in water under the synergistic effect of the counter mechanism by the self damping action, so as to avoid touching the lower limit structure 11b or touching the component moving integrally with the floating body 1 within the designed wave height range, and avoid motion stagnation failure.
In this embodiment, the buoyancy tank 14b is connected under the resistance disc 9 by soft chain traction, and the buoyancy tank 14b is suspended under the resistance disc 9 under the action of downward traction of the soft chain. The length of the flexible chain is such that the buoyancy tank 14b is in the middle of the range of motion of the resistance disc 9. When the resistance disc 9 moves from the upper end to the lower end of the movement section to the middle section, it is combined with the buoyancy tank 14b, and if no external force acts, the combined body stays at the initial combined position. Under the action of external force, the combined body can continuously move downwards together, but because the buoyancy of the combined body is larger than the gravity, the natural movement trend of the combined body is changed into upwards, the kinetic energy of the downward movement of the combined body is weakened, and in the wave height range set by the system, the resistance disc 9 is prevented from touching the lower limit structure 11b or touching a part which moves integrally with the floating body 1, and the combined body can start to move upwards before touching. When the combined body moves upward to the original combined position, the resistance disc is naturally separated from the buoyancy tank 14b, so that continuous reciprocating motion is obtained, and stable wave energy is output to the power generation mechanism.
Of course, when the power generation system is designed such that the sum of the buoyancy force of the resistance disc 9 plus its load (such as the push rod 15, etc.) is greater than the sum of the gravity forces, it is necessary to dispose the weight 14a above the resistance disc 9 with the weight 14a at or near the middle position of the movement range of the resistance disc 9. The gravity of the counterweight 14a and the natural upward movement force of the resistance disc 9 are balanced, so that the resistance disc 9 can be kept in a relatively static state in water under the cooperative action of the balancing mechanism, the condition that the resistance disc cannot touch the upper limit structure 11a and the lower limit structure 11b or the floating body 1 or other parts integrally moving along with the floating body 1 in the designed wave height range (the relative movement range of the floating body and the resistance disc is matched with the normal wave height of the sea area to which the device is applied when the device is designed) is met, the relative movement failure is avoided, and the energy conversion efficiency is improved.
Referring to fig. 4, experiments show that the output voltage can be stabilized in the range of 260-400V by connecting the kinetic energy obtained by converting the wave energy absorbing and converting device in the system with the electric energy converting device, and the waveform is continuous and stable, which shows that compared with the technology invented by the inventor before, the power generation continuity is good, and the power generation efficiency is obviously improved.
The manner of setting the counter mechanism used in the present embodiment is one of the choices of the present invention, and is not a limitation of the present invention.
Example 2:
For the system of example 1, there is still a possibility that the resistance disc 9 will touch the limit structure when the wave height greatly exceeds the ideal working wave height range of the system design, and therefore, in this case, a further improved counter-balancing mechanism scheme can be adopted, as shown in fig. 6, which adopts a structure of multiple stages of loading weights 14a, one (or a plurality of weights as the case may be) is added, and soft chain connection is adopted between the weights 14 a. This further reduces the likelihood of the resistance disc touching the limit structure.
In the present embodiment, the power generation mechanism composed of the hydraulic pump 16, the hydraulic motor 17 and the power generator 2 is schematically shown in the drawing and is simplified to the part shown by the broken line in the drawing, namely, the power generation mechanism 13, and it should be noted that this is schematically shown and does not reflect the actual structural connection relationship, and the actual arrangement structure may adopt the structure of embodiment 1 or other structures that will be easily understood by those skilled in the art.
Example 3:
in addition, referring again to fig. 7, for a more complex scenario of application, to apply reasonable counter-force to the damping disk 9, a hybrid and multi-stage loading configuration may be employed, with both the counterweight 14a and the buoyancy tank 14b being loaded, and both the counterweight and buoyancy tank being multi-stage, as shown with two stages of counterweight.
The power generation system shown in the above embodiments can transmit power through a power output line or a facility with similar functions after obtaining the power, and these power transmission technologies are all conventional technologies, which are not further shown in the drawings.
As can be seen from the above embodiments, most of the structures of the power generation system disclosed by the invention are below the horizontal plane, and have good wind and wave resistance, so that the reliability is strong; the power generation equipment and the control part are sealed in the floating body, so that the corrosion of seawater can be effectively avoided, and the maintenance cost is reduced.
In conclusion, the system provided by the invention has the advantages of simple structure, low manufacturing cost and maintenance cost, improves the utilization rate of wave energy, and increases the reliability of long-term operation.
The foregoing has been presented for purposes of illustrating the concepts of the invention and it is apparent that the foregoing description of all embodiments is a partial, but not complete, embodiment of the invention. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
Claims (8)
1. A wave energy power generation system comprises a wave energy absorbing and converting device and a power generation mechanism (13); the wave energy absorbing and converting device comprises a floating body (1), a damping disc (9) and a guide shaft (5); the guide shaft (5) is connected to the bottom of the floating body (1), the damping disc (9) is sleeved on the guide shaft (5) relatively movably, and a limiting structure is arranged above and/or below the damping disc (9) to limit the movement range of the damping disc (9); the floating body (1) drives the guide shaft (5) to move up and down together under the action of waves, so that relative motion is generated between the floating body and the damping disc (9), and the power generation mechanism (13) receives the power output by the relative motion and converts wave energy into electric energy;
the damping disc is characterized in that a counterbalance mechanism (14) is arranged at or near the middle position of the movement section of the damping disc to counterbalance the upward or downward movement trend of the damping disc (9); the counter force of the counter mechanism (14) is the gravity of the counterweight (14 a) or the buoyancy of the buoyancy tank (14 b), and the counter force is opposite to the natural motion direction of the damping disc (9), so that the damping disc (9) keeps a relatively static state in water under the synergistic effect of the counter mechanism (14), and the counter mechanism is not contacted with the limiting structure or the floating body (1) or a part integrally moving with the floating body in the upper and lower directions within the wave height range of the system design;
The power generation mechanism (13) is an oil pump hydraulic motor power generation device and comprises a hydraulic pump (16), a hydraulic motor (17) and a power generator (2) which are arranged in the floating body (1); the pushing rod (15) of the hydraulic pump (16) is connected with the damping disc (9) through the transmission part (3), the floating body (1) and the damping disc (9) generate relative motion under the action of waves, the driving part (3) and the pushing rod (15) push the internal piston of the hydraulic pump (16) to move, and liquid in the hydraulic pump pushes the hydraulic motor (17), so that the generator (2) is driven to generate electricity;
When the buoyancy of the damping disc (9) is designed to be larger than the gravity borne by the damping disc, in order to counter the upward movement trend of the damping disc, a counterweight (14 a) is loaded above the damping disc, so that the sum of the gravity borne by the damping disc (9) and the counterweight (14 a) is larger than the sum of the buoyancy of the damping disc and the counterweight; when the damping disc (9) moves from the lower end to the upper end of the movement section to the middle area, the damping disc is combined with the counterweight (14 a) to weaken the rising kinetic energy of the resistance disc, so that the combined body stays at or near the initial combined position, and the damping disc (9) is prevented from touching the upper limiting structure (11 a) or the floating body (1) or a part which moves integrally with the floating body in the designed wave range;
When the bearing gravity of the damping disc (9) is designed to be greater than the buoyancy of the damping disc, in order to counter the downward movement trend of the damping disc, a buoyancy tank (14 b) is loaded below the damping disc (9), so that the sum of the buoyancy of the damping disc (9) and the buoyancy tank (14 b) is greater than the sum of the gravity borne by the damping disc and the buoyancy tank; when the damping disc (9) moves from the upper end to the lower end of the movement section to the middle area, the damping disc is combined with the buoyancy tank (14 b) to weaken the descending kinetic energy of the damping disc, so that the combined body stays at or near the initial combined position, and the damping disc (9) is prevented from touching the lower limiting structure (11 b) or a part which moves integrally with the buoyancy body in the designed wave range.
2. The wave energy power generation system according to claim 1, characterized in that: the counterweight (14 a) is suspended above the damping disk (9) by a soft chain, and the soft chain is connected with the guide shaft (5) or a part which is integrated with the guide shaft (5) and moves together; the soft chain is of any length.
3. The wave energy power generation system according to claim 2, characterized in that: the length is such that the counterweight (14 a) is located at a position intermediate the movement sections of the damping disk (9).
4. The wave energy power generation system according to claim 1, characterized in that: the buoyancy tank (14 b) is suspended below the damping disc (9) by traction of a soft chain, and the soft chain is connected to the guide shaft (5) or a part which is integrated with the guide shaft (5) and moves together; the soft chain is of any length.
5. The wave energy power generation system according to claim 2, characterized in that: the length is the length of the buoyancy tank (14 b) at the middle position of the movement section of the damping disk (9).
6. The wave energy power generation system according to claim 2 or 4, characterized in that: the counter balance mechanism (14) adopts a multistage loading mode, namely a plurality of counterweights (14 a) or a plurality of buoyancy tanks (14 b) are loaded, and each counterweight or each buoyancy tank is connected together in sequence through a soft chain.
7. The wave energy power generation system according to claim 2 or 4, characterized in that: the counter balance mechanism (14) adopts a mixed and multistage loading mode, namely one or more counter weights (14 a) are loaded, one or more buoyancy tanks (14 b) are loaded at the same time, and each counter weight or each buoyancy tank is connected together in sequence through a soft chain.
8. The wave energy power generation system according to any of claims 1-5, characterized in that: the limiting structure is arranged at the upper part and/or the lower part of the guide shaft, and is positioned above and/or below the damping disc to limit the movement interval of the resistance disc in the state of not loading the counter balancing mechanism;
Or the limiting structure takes one part of a part integrally connected and fixed with the guide shaft or the floating body as the limiting structure, and the part is positioned above and/or below the damping disk to limit the movement range of the resistance disk in the state of not loading the counter balance mechanism.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910833378.2A CN110529330B (en) | 2019-09-04 | 2019-09-04 | Wave energy power generation system |
| EP20861218.4A EP4027004A4 (en) | 2019-09-04 | 2020-08-27 | Wave energy absorbing and converting device and power generation system |
| PCT/CN2020/111557 WO2021043049A1 (en) | 2019-09-04 | 2020-08-27 | Wave energy absorbing and converting device and power generation system |
| US17/640,780 US20220333571A1 (en) | 2019-09-04 | 2020-08-27 | Wave energy absorbing and converting device and power generation system |
| KR1020227010932A KR102591408B1 (en) | 2019-09-04 | 2020-08-27 | Wave absorption conversion device and power generation system |
| JP2022514742A JP2022551226A (en) | 2019-09-04 | 2020-08-27 | Wave energy absorption converter and power generation system |
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| CN201910833378.2A CN110529330B (en) | 2019-09-04 | 2019-09-04 | Wave energy power generation system |
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| CN110529330B true CN110529330B (en) | 2024-05-07 |
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| EP4027004A4 (en) * | 2019-09-04 | 2022-11-02 | Academy of Systems Engineering, PLA Academy of Military Sciences | Wave energy absorbing and converting device and power generation system |
| CN112610394A (en) * | 2020-12-18 | 2021-04-06 | 中国人民解放军军事科学院系统工程研究院 | Hydraulic mass transfer floating type wave power generation device |
| CN113294281B (en) * | 2021-05-13 | 2022-04-15 | 浙江大学 | Wave energy power generation device and amplification mechanism under low energy current density |
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