CN109707555B

CN109707555B - A near-shore reflection type wave energy gathering power generation device

Info

Publication number: CN109707555B
Application number: CN201910191032.7A
Authority: CN
Inventors: 何广华; 张志刚; 栾政晓; 刘双
Original assignee: Harbin Institute of Technology Weihai
Current assignee: Harbin Institute of Technology Weihai
Priority date: 2019-03-12
Filing date: 2019-03-12
Publication date: 2020-04-28
Anticipated expiration: 2039-03-12
Also published as: CN109707555A

Abstract

A near-shore reflection type wave energy-gathering power generation device belongs to the field of wave power generation and ocean engineering equipment. The invention solves the technical problems of low power generation power and low conversion efficiency of a single point suction type power generation device in the prior art. The technical points are as follows: the energy-gathering arc-shaped wall comprises an energy-gathering arc-shaped wall, a rigid arm connecting rod, a floater and a hydraulic power generation system; the bottom of the energy-gathering arc-shaped wall is fixed on the sea bottom, and the height above the water surface is higher than the height of the wave surface after energy gathering; the floater is movably connected with the inner wall of the energy-gathering arc-shaped wall by two rigid arm connecting rods; each set of rigid arm connecting rod comprises two parallel rigid arms, and a parallelogram moving mechanism is formed among the two parallel rigid arms, the energy-gathering arc-shaped wall and the floater; the two sets of hydraulic power generation systems are respectively connected with the two sets of rigid arm connecting rods in a one-to-one correspondence manner. The invention is used for near shore power generation, fundamentally improves the power generation power, reduces the power generation cost, has simple design and long service life, and is easy for modular application.

Description

Near-shore reflection type wave energy-gathering power generation device

Technical Field

The invention relates to a wave energy-gathering power generation device, in particular to a near-shore reflection type wave energy-gathering power generation device, and belongs to the field of wave energy power generation and ocean engineering equipment.

Background

Waves are one of the important environmental elements in the ocean and can provide inexhaustible green energy for human beings. With the increasing difficulty of land energy development, mankind accelerates the footsteps for developing and utilizing wave energy. The near-shore wave energy has the characteristics of low development difficulty and low early investment, and can be used as a supplementary energy for the development of coastal cities. The main way for human beings to develop and utilize wave energy is to convert the potential energy or kinetic energy of waves into electric energy by using a wave energy power generation device. Among a plurality of wave energy conversion devices, the point-suction type wave energy power generation device is a wave energy power generation device with higher conversion efficiency, low construction difficulty and low investment cost, and utilizes the heave motion of a floater to capture wave energy.

However, in the prior art, the power generation power of a single floater is limited by the size of the floater and the wave amplitude, so that the power generation cost is high, and the large-scale market application is difficult to realize. Aiming at the problem of low power generation of a single floater, people only increase the total power generation by increasing the number of power generation devices and do not fundamentally increase the power generation of the single floater. In addition, the floater generates pitching motion in addition to heaving motion in the waves, and the buoyancy of the floater is lost, so that the wave energy conversion efficiency is reduced.

Patent document CN103939271A entitled "combined oscillating floater wave energy power generation device" discloses an oscillating floater type power generation system including a plurality of floaters, which mainly comprises a submerged floater, a fixed frame, a plurality of floaters, a hydraulic motor and a hydraulic transmission mechanism. The device increases the total generating power by increasing the number of the floaters, but the generating efficiency of the single floater is not fundamentally increased, and the generating cost is not reduced.

In patent document CN106948998A entitled "a hybrid wave energy capturing device", a wave energy power generation device combining an oscillating water column and an oscillating floater is disclosed, which mainly comprises a main cavity, a floater, a pneumatic energy capturing system, a hydraulic wave energy capturing system and an anchoring system. The floater in the oscillating floater power generation module is connected with the main cavity through the single rigid arm, and the floater inevitably has a certain pitching angle during the heave movement, so that the amplitude of the heave movement is reduced, and the energy conversion efficiency is reduced.

Therefore, how to fundamentally improve the power and the wave energy conversion efficiency of the point-suction type wave energy power generation device so as to reduce the power generation cost is an urgent engineering problem to be solved at present.

Disclosure of Invention

The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to determine the key or critical elements of the present invention, nor is it intended to limit the scope of the present invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.

In view of the above, the invention aims to solve the technical problems of low power generation and low conversion efficiency of a single point suction type power generation device in the prior art, and further designs a near-shore reflection type wave energy-gathering power generation device, so that the power and the wave energy conversion efficiency of the point suction type wave energy power generation device are fundamentally improved, and the power generation cost is reduced.

The scheme adopted by the invention is as follows: a near-shore reflection type wave energy-gathering power generation device comprises an energy-gathering arc wall, a rigid arm connecting rod, a floater and a hydraulic power generation system; the bottom of the energy-gathering arc-shaped wall is fixed on the sea bottom, and the height above the water surface is higher than the height of the wave surface after energy gathering; the floater is movably connected with the inner wall of the energy-gathering arc-shaped wall by two rigid arm connecting rods; each set of rigid arm connecting rod comprises two parallel rigid arms, and a parallelogram moving mechanism is formed among the two parallel rigid arms, the energy-gathering arc-shaped wall and the floater; the two sets of hydraulic power generation systems are respectively connected with the two sets of rigid arm connecting rods in a one-to-one correspondence manner.

Further: the energy-gathering arc-shaped wall is of an energy-gathering structure, is made of concrete or metal, and has a semicircular cross section; the inner diameter of the semicircular ring is determined by comprehensively considering the size of the whole power generation device and the wavelength of the sea area where the power generation device is located; the thickness of the energy-gathering arc-shaped wall is selected in consideration of the wave force so as to ensure enough strength; the energy-gathering arc-shaped wall is arranged on the seabed, and the installation depth is enough to resist the impact of waves.

Further: the floater is in a round cake shape, the size of the floater is determined according to the size of an energy gathering area, and the center of the floater is located at the position with the maximum wave energy density. The floater generates heave motion along with the fluctuation of waves to capture the wave energy and convert the potential energy of the waves into the potential energy of the floater.

Further: each set of rigid arm connecting rod comprises two parallel rigid arms, the rigid arms are connected with the floater through rigid arm connecting rod revolute pairs, and the rigid arms are connected with the energy-gathering arc-shaped wall through rigid arm connecting rod spherical hinges.

Further: each set of hydraulic power generation system comprises a hydraulic transmission mechanism, an oil delivery pipe and a power generation unit, the hydraulic transmission mechanism is connected with the energy-gathering arc-shaped wall through a hydraulic transmission mechanism spherical hinge, and the hydraulic transmission mechanism is connected with the upper rigid arm of the rigid arm connecting rod through a hydraulic transmission mechanism revolute pair; the oil delivery pipe is used for connecting the hydraulic transmission mechanism and the power generation unit.

Further: the power generation unit is arranged on the top surface of the energy-gathering arc-shaped wall.

Further: the two sets of rigid arm connecting rods and the two sets of hydraulic power generation systems are symmetrically distributed about the central plane of the energy-gathering arc-shaped wall.

Further: the hydraulic transmission mechanism comprises a hydraulic cylinder, a piston connecting rod and a sealing ring, the piston is installed on the piston connecting rod, the sealing ring is arranged between the piston connecting rod and the inner wall of the hydraulic cylinder, the hydraulic cylinder is connected with the energy-gathering arc-shaped wall through a spherical hinge of the hydraulic transmission mechanism, hydraulic oil is filled in the hydraulic cylinder, and the piston connecting rod in the hydraulic cylinder is connected with the rigid arm through a revolute pair of the hydraulic transmission mechanism.

Further: the hydraulic transmission mechanism spherical hinge is arranged on the inner wall of the energy-gathering arc-shaped wall, and the hydraulic transmission mechanism spherical hinge is inclined downwards by a certain angle, so that the hydraulic transmission mechanism spherical hinge, the hydraulic cylinder and the piston connecting rod in the initial state are positioned on the same straight line.

Further: and two oil delivery pipes of each set of hydraulic power generation system are arranged, and each hydraulic cylinder is connected with the power generation unit through two oil delivery pipes. Each oil conveying pipe can be used for oil outlet and oil inlet.

The invention achieves the following effects:

1. according to the invention, wave energy can be gathered at the floater through the reflection and convergence action of the energy gathering arc-shaped wall, so that the oscillation amplitude of the floater can be obviously improved, and the power generation power is fundamentally increased.

2. The two rigid arms in the rigid arm connecting rod system, the floater and the energy-gathering arc-shaped wall form a parallelogram moving mechanism, so that the floater can only do heave motion without generating pitching motion, and the conversion efficiency is improved.

3. In the invention, two rigid arm connecting rod systems and two hydraulic power generation systems are symmetrically distributed on two sides of the central plane of the energy-gathering arc-shaped wall, so that the floater is always positioned at the position with the maximum wave energy density without position deviation.

4. The power generation unit of the hydraulic power generation system is positioned above the water surface, cannot be corroded by seawater and has long service life.

5. The invention can be easily copied in a modularized way, and an array formed by a plurality of power generation device modules can generate larger generated power.

Drawings

FIG. 1 is a diagram illustrating the overall effect of an embodiment of the present invention;

FIG. 2 is an effect diagram of the power generation device of FIG. 1 after being modularly duplicated;

FIG. 3 is a schematic view of the connection of the rigid arm linkage and the hydraulic power generation system of FIG. 1;

FIG. 4 is a cross-sectional view of the rigid arm linkage system of FIG. 3;

FIG. 5 is a cross-sectional view of the hydraulic transmission mechanism and oil delivery tube of FIG. 3;

FIG. 6 is a graph showing a time-varying wave surface at the center of the float after wave focusing;

FIG. 7 is a top view of the instantaneous waves after wave focusing;

fig. 8 is a side view of the instantaneous waves after wave focusing.

In the figure: 1-energy-gathering arc-shaped wall, 2-floater, 3-rigid arm connecting rod, 4-hydraulic power generation system, 31-rigid arm connecting rod spherical hinge, 32-rigid arm, 33-rigid arm connecting rod revolute pair, 41-power generation unit, 42-hydraulic transmission mechanism spherical hinge, 43-oil pipeline, 44-hydraulic cylinder, 45-piston, 46-sealing ring, 47-piston connecting rod, 48-hydraulic transmission mechanism revolute pair, 311-rigid arm connecting rod spherical hinge base, 312-rigid arm connecting rod spherical hinge head, 331-rigid arm connecting rod revolute pair ear ring, 332-rigid arm connecting rod revolute pair pin shaft, 421-hydraulic transmission mechanism spherical hinge base, 422-hydraulic transmission mechanism spherical hinge head, 431-upper oil pipeline, 432-lower oil pipeline, 481-hydraulic transmission mechanism revolute pair ear ring, 482-hydraulic drive mechanism revolute pair pin.

Detailed Description

In the interest of clarity and conciseness, not all features of an actual implementation are described in the specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.

It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the device structures and/or processing steps closely related to the solution according to the present invention are shown in the application document, and other details not closely related to the present invention are omitted.

Example (b): with reference to fig. 1 to 8, a near-shore reflective wave energy gathering power generation device of the present embodiment is further described:

a near-shore reflection type wave energy-gathering power generation device is disclosed, and referring to fig. 1, the device comprises an energy-gathering arc-shaped wall 1, a rigid arm connecting rod 3, a floater 2 and a hydraulic power generation system 4; the energy-gathering arc-shaped wall 1 is used for gathering waves, the floater 2 moves up and down along with the waves to capture potential energy of the waves, and the floater 2 is movably connected with the energy-gathering arc-shaped wall 1 through the rigid arm connecting rod 3. The power generation device comprises two rigid arm connecting rods 3 and two hydraulic power generation systems 4. The two sets of connecting rod systems 3 are symmetrically distributed, so that the position of the floater 2 can be always positioned at an energy concentration position. The hydraulic power generation system 4 converts the potential of the float 2 into hydraulic energy and further into electric energy.

An offshore reflective wave energy gathering power generation device can be easily copied in a modularized mode, and an array formed by a plurality of power generation device modules can generate larger generated power. See fig. 2.

Preferably, the top view of the energy-gathering arc-shaped wall 1 is a semi-annular shape, and the size of the inner diameter of the energy-gathering arc-shaped wall 1 is determined by comprehensively considering the size of the device and the wavelength of the sea area. Incident waves are reflected on the inner surface of the energy-gathering arc-shaped wall 1, and due to the convergence effect of the arc surfaces, the waves are gathered in a certain area, so that the wave energy density is improved.

Preferably, the floater 2 is in a round cake shape, the size of the floater 2 is determined according to the size of an energy gathering area, and the center of the floater is positioned at the position with the maximum wave energy density. The float 2 will generate a heave motion as the waves fluctuate, converting the potential energy of the waves into the potential energy of the float 2.

Preferably, referring to fig. 1 and 3, each set of rigid arm connecting rod 3 comprises 2 rigid arms 32, the rigid arms 32 are connected with the energy-gathering arc-shaped wall 1 through rigid arm connecting rod spherical hinges 31, and the rigid arms 32 are connected with the floats 2 through rigid arm connecting rod revolute pairs 33. When the floater moves up and down, the floater 2 rotates with the rigid arm 32, and the rigid arm 32 rotates around the rigid arm connecting rod ball joint 31.

Preferably, referring to fig. 3, the power generating unit 41 is placed on the upper surface of the energy concentrating curved wall 1. The hydraulic cylinder 44 is connected with the energy-gathering arc-shaped wall 1 through a hydraulic transmission mechanism spherical hinge 42. The power generation unit 41 is connected with the hydraulic cylinder 44 by an oil pipeline 43. The piston connecting rod 47 is connected with the rigid arm 32 by a hydraulic transmission mechanism rotating pair 48. When the rigid arm 32 rotates, the piston rod 47 rotates about the hydraulic transmission revolute pair 48 and the hydraulic cylinder 44 rotates about the hydraulic transmission spherical hinge 42.

Fig. 4 is a cross-sectional view of a rigid arm link. One end of the rigid arm 32 is connected with the energy-gathering arc-shaped wall 1 through a rigid arm connecting rod spherical hinge head 312 and a rigid arm connecting rod spherical hinge seat 311, and the other end is connected with the floater 2 through a rigid arm connecting rod revolute pair earring 331 and a rigid arm connecting rod revolute pair pin shaft 332.

Preferably, a parallelogram moving mechanism is formed between the two rigid arms 32 in each set of rigid arm connecting rods 3 and the energy-gathering arc-shaped wall 1 and the floater 2 respectively, so that the floater 2 can only do heave motion and does not generate pitching motion.

Fig. 5 is a sectional view of the hydraulic transmission mechanism. The hydraulic cylinder 44 is movably connected with the energy-gathering arc-shaped wall 1 through a hydraulic transmission mechanism ball hinge head 422 and a hydraulic transmission mechanism ball hinge seat 421, and the piston connecting rod 47 is connected with the rigid arm 32 through a hydraulic transmission mechanism revolute pair lug ring 481 and a hydraulic transmission mechanism revolute pair pin shaft 482. The upper flow pipe 431 and the lower flow pipe 432 are used to connect the hydraulic cylinder 44 and the power generation unit 41. When the floater 2 moves upwards, the piston 45 moves towards the direction of the lower oil delivery pipe 432, at the moment, the lower oil delivery pipe 432 produces oil, and the upper oil delivery pipe 431 takes oil; when the float moves downwards, the piston 45 moves towards the upper oil delivery pipe 431, the lower oil delivery pipe 432 takes oil in at the moment, and the upper oil delivery pipe 431 takes oil out. And then the power generation unit is driven to generate electric energy.

To prove the energy gathering effect of the device, the wave surface of the wave gathering area of the device is subjected to computational analysis.

The selected wave conditions are: the incident wavelength is 15 meters, and the wave height is 0.3 meter. The inner diameter of the energy-gathering arc-shaped wall 1 is set to be 3 meters. As shown in fig. 6, it can be found that the wave amplitude at the center of the float can reach more than 2.5 times of the incident wave height for the process curve of the change with time T after the wave surface at the center of the float 2 is dimensionless by the incident wave height, which shows that the wave-gathering effect is obvious.

Fig. 7 is a top view of the instantaneous dimensionless wave surface when T is 11.1s in fig. 6, that is, when the wave surface is highest at the center of the float, it can be found that not only the wave surface at the center of the float is enlarged, but also the wave height in the whole wave-focusing region can be more than twice of the incident wave height, which illustrates that the present invention has a strong regional wave-focusing capability.

Fig. 8 is a side view of the instantaneous wave surface when T is 11.1s in fig. 6, that is, when the wave surface at the center of the float is the highest, it can be found that the wave surface on one side of the incident wave direction of the energy-concentrating arc-shaped wall is obviously lifted, and the energy-concentrating effect of the invention is verified.

The near-shore reflection type wave energy-gathering power generation device can fundamentally improve the power generation power and the conversion efficiency, reduces the power generation cost, and is simple in design, long in service life and easy to modularize and apply.

It should be noted that the number of the rigid arm connecting rods and the number of the hydraulic power generation systems in the present invention are not limited to this embodiment, and in order to ensure that the horizontal position of the float is not changed, more than two rigid arm connecting rod systems and hydraulic power generation systems may be adopted. The number of the rigid arms in each rigid arm connecting rod system is not limited by the embodiment, and in order to ensure that the rigid arms, the energy-gathering arc-shaped wall and the floater form a parallelogram moving mechanism, the number of the rigid arms is more than 2. The specific structural design of the hydraulic power generation system is not limited to this embodiment, as long as the energy of the up-and-down movement of the float can be converted into electric energy. Also, the shape and size of the float are not limited to this embodiment as long as the float is ensured. The working sea state of the invention is not limited by numerical calculation examples, and the invention can play a role in energy collection in a large wave frequency range.

The above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A near-shore reflection type wave energy-concentrating power generation device, characterized in that it comprises an energy-concentrating arc wall (1), a rigid arm connecting rod (3), a float (2) and a hydraulic power generation system (4); the described The bottom of the energy-concentrating arc wall (1) is fixed on the seabed, and the height of the upper part of the energy-concentrating arc wall protruding from the water surface is higher than the height of the wave surface after the energy-concentration; between the float (2) and the inner wall of the energy-concentrating arc wall (1), two A set of rigid arm links (3) are movably connected; each set of rigid arm links (3) includes two parallel rigid arms, between the two parallel rigid arms and the energy-gathering arc wall (1) and the float (2) A parallelogram movable mechanism is formed; two sets of hydraulic power generation systems (4) are respectively connected with two sets of rigid arm connecting rods in one-to-one correspondence.

2. A near-shore reflection type wave energy-concentrating power generation device according to claim 1, characterized in that: the energy-concentrating arc wall (1) is an energy-concentrating structure, and its material is concrete or metal, and its cross-section is It is a semi-circle; the inner diameter of the semi-circle is determined by comprehensively considering the size of the entire power generation device and the wavelength of the sea area where it is located; the thickness of the energy-concentrating arc wall should consider the wave force to ensure sufficient strength; the energy-concentrating arc wall The wall is installed on the seabed, and the installation depth should be sufficient to resist the impact of waves.

3. A near-shore reflection type wave energy gathering power generation device according to claim 1 or 2, characterized in that: the float (2) is in the shape of a round cake, and the size of the float (2) is determined according to the size of the energy gathering area , the center of the float is located where the wave energy density is maximum.

4. A near-shore reflection type wave energy concentrating power generation device according to claim 3, characterized in that: each set of rigid arm connecting rods (3) comprises two parallel rigid arms (32), the rigid arms (32 ) and the float (2) are connected by a rigid arm link rotating pair (33), and the rigid arm (32) and the energy-gathering arc wall are connected by a rigid arm link ball joint (31).

5. A near-shore reflection type wave energy gathering power generation device according to claim 4, characterized in that: each hydraulic power generation system (4) comprises a hydraulic transmission mechanism, an oil pipeline (43) and a power generation unit (41), A hydraulic transmission mechanism ball joint (42) is used for connection between the hydraulic transmission mechanism and the energy-gathering arc wall (1), and a hydraulic transmission mechanism rotating pair (48) is used between the hydraulic transmission mechanism and the upper rigid arm of the rigid arm link (3). ) connection; the oil pipeline (43) is used to connect the hydraulic transmission mechanism and the power generation unit (41).

6 . The nearshore reflection type wave energy-concentrating power generation device according to claim 5 , wherein the power generating unit ( 41 ) is placed on the top surface of the energy-concentrating arc wall ( 1 ). 7 .

7. A near-shore reflection type wave energy-concentrating power generation device according to claim 6, characterized in that: the two sets of rigid arm connecting rods (3) and the two sets of hydraulic power generation systems (4) are about the energy-concentrating arc shape The center plane of the wall (1) is symmetrically distributed.

8 . The near-shore reflection type wave energy gathering power generation device according to claim 7 , wherein the hydraulic transmission mechanism comprises a hydraulic cylinder ( 44 ), a piston ( 45 ), a piston connecting rod ( 47 ) and The sealing ring (46), the piston (45) is installed on the piston connecting rod (47), the sealing ring (46) is arranged between the piston connecting rod (47) and the inner wall of the hydraulic cylinder (44), and the hydraulic cylinder (44) passes through the hydraulic transmission mechanism The ball hinge (42) is connected with the energy-gathering arc wall (1), the hydraulic cylinder (44) is filled with hydraulic oil, and the piston connecting rod (47) in the hydraulic cylinder (44) rotates the pair (48) and the rigidity through the hydraulic transmission mechanism. The arms are connected together.

9. A near-shore reflection type wave energy-concentrating power generation device according to claim 8, characterized in that: the hydraulic transmission mechanism spherical hinge (42) is arranged on the inner wall of the energy-concentrating arc wall (1), and The ball joint (42) of the hydraulic transmission mechanism is inclined downward at a certain angle so that the ball joint (42), the hydraulic cylinder (44) and the piston connecting rod (47) of the hydraulic transmission mechanism in the initial state are in a straight line.

10. A near-shore reflection type wave energy gathering power generation device according to claim 9, characterized in that: each hydraulic power generation system (4) has two oil pipes (43), and each hydraulic cylinder (44) It is connected with the power generation unit (41) through two oil pipelines (43).