Wave energy power generation device based on multi-floater common air pressure cabin

Abstract

The invention discloses a wave power generation device based on a multi-floater common air pressure cabin, which comprises a plurality of floater assemblies and a periodic circulation system, the periodic circulation system comprises an external cylinder, a plurality of internal air pressure cylinders mounted in the external cylinder, a common air pressure cabin and a power generation fan, and a mounting plate is arranged in the external cylinder. The internal air pressure cylinders are mounted on the mounting plate, and the number of the internal air pressure cylinders is equal to that of the floater assemblies; a closed cavity is formed in the lower part of the outer barrel through the mounting plate; the floater assemblies surround the outer side of the outer cylinder and are independent of one another, one end of each floater assembly is connected with a piston, the pistons extend into the inner air pressure cylinder, and the floater assemblies drive the pistons to move so as to change the air pressure in the inner air pressure cylinder. When the piston moves upwards or downwards, the airflow can drive the power generation fan to generate power. Through cooperation of the floater assembly and the periodic circulation system, utilization of a complete wave period is achieved, and the conversion and utilization efficiency of wave energy is improved.

Description

Technical Field

[0001] This invention relates to the field of wave energy resource utilization technology, and in particular to a wave energy power generation device based on a multi-buoy shared pressure chamber. Background Technology

[0002] Research by the International Renewable Energy Agency (IRENA) also shows that ocean energy holds enormous potential to drive the development of the global blue economy. Among various forms of ocean energy resources, wave energy, due to its high energy density, long sustainable power generation time, clean and pollution-free operation, and minimal environmental impact, has become an important choice for global energy structure transformation and sustainable development.

[0003] To develop and utilize wave energy, researchers and engineers worldwide have developed a series of wave energy conversion devices. The main wave energy technologies can be categorized into three types: oscillating water column technology, oscillating float (point absorption) technology, and wave-gathering and wave-crossing technology. The oscillating float wave energy device is a conversion device that utilizes ocean wave energy. It captures wave energy through the movement of a floating body and converts it into electrical energy. This type of device is currently the most valued and widely used wave energy device due to its small footprint, simple structure, ease of installation, disassembly, and maintenance, and suitability for transportation and integrated development. Oscillating float wave energy generation technology is mainly divided into single-float and multi-float technologies. Multi-float technology uses the relative motion between the floating body and the supporting platform to achieve wave energy conversion; this type of technology is currently the most researched. For example, in 2014, Southeast University developed an oscillating float wave energy conversion device with an installed capacity of 1kW. This device employs a dual-buoy structure design. The outer float achieves resonance by adjusting its draft and the incident wave, while the inner float is equipped with a damping plate that enhances damping under the influence of the surrounding water. The vertical relative motion of the inner and outer floats drives a permanent magnet linear generator. This device represents a further improvement in energy capture and conversion. Sweden has introduced the L9 oscillating float device. This device uses a flat cylindrical body as a float to absorb energy, and its core feature is that the generator is fixed and sealed on the seabed. The float is connected to the generator via tensioned cables, and a linear motor is used as the energy conversion device. It is evident that both domestic and international research and development in oscillating float-type wave energy generation devices have reached varying degrees.

[0004] However, although existing oscillating float-type wave energy generation devices can effectively increase the power generation of the device by having multiple oscillating floats simultaneously absorbing wave energy, their energy conversion efficiency is low under long-period wave conditions, which increases the operating cost of the project to some extent. In addition, the use of hydraulic transmission systems to achieve energy conversion cannot fully utilize the complete wave cycle, resulting in low wave energy conversion efficiency.

[0005] Therefore, based on the above, how to make full use of the complete wave cycle and improve the energy conversion efficiency of the device is an urgent problem that needs to be solved for the further improvement and development of oscillating float-type wave energy conversion devices. Summary of the Invention

[0006] Purpose of the invention: To address the shortcomings of existing technologies, such as the inability to fully utilize the complete wave cycle and low wave energy conversion efficiency, this invention provides a wave energy power generation device based on a multi-buoy shared pressure chamber.

[0007] Technical Solution: To solve the above problems, this invention employs a wave energy generation device based on a multi-buoy shared pressure chamber, comprising multiple float assemblies and a periodic circulation system. The periodic circulation system includes an outer cylinder, multiple internal pressure cylinders installed within the outer cylinder, a shared pressure chamber, and a power generation fan. An installation plate is provided inside the outer cylinder, and the internal pressure cylinders are installed on the installation plate, with the number of internal pressure cylinders equal to the number of float assemblies. The installation plate forms a sealed cavity at the bottom of the outer cylinder. The float assemblies surround the outer side of the outer cylinder, and each float assembly interacts with... The device is independent, with a piston connected to one end of the float assembly. The piston extends into the internal pressure cylinder, and the float assembly drives the piston to move, thereby changing the internal air pressure of the internal pressure cylinder. The internal pressure cylinder is equipped with a connecting pipe for connecting to the atmosphere. A one-way valve is provided at the connection between the connecting pipe and the internal pressure cylinder, allowing gas to flow from the connecting pipe to the internal pressure cylinder. The internal pressure cylinder is connected to one side of the common pressure chamber through a first guide pipe, and a second guide pipe is connected to the other side of the common pressure chamber. The generator fan is installed in the second guide pipe, which is connected to the sealed cavity.

[0008] Furthermore, the float assembly includes a float and a connecting rod. The connecting rod includes a first connecting rod connected to the float, a second connecting rod connected to the piston, and a crossbar connecting the first and second connecting rods. The axes of the first connecting rod, the second connecting rod, the internal air pressure cylinder, and the external cylinder are parallel to each other.

[0009] Furthermore, the bottom surface of the float has a parabolic shape.

[0010] Furthermore, a float partition is provided between adjacent floats, the float partition is installed on the outer wall of the outer cylinder, and a float limiting plate is provided on the top of the float partition.

[0011] Furthermore, the length of the float partition along the axis of the outer cylinder is greater than the length of the first connecting rod, and the float limiting plate is flush with the top surface of the outer cylinder.

[0012] Furthermore, the connecting pipe is L-shaped, and the connection point between the connecting pipe and the internal air pressure cylinder is lower than the lowest movement position of the piston.

[0013] Furthermore, the cross-sectional area of ​​the second guide tube is smaller than the cross-sectional area of ​​the common pressure chamber.

[0014] Furthermore, the power generation wind turbine is a vertical axis Darrieux model power generation wind turbine, comprising three blades and a rotating shaft, wherein the blades are curved and rotate around the rotating shaft to generate electricity.

[0015] Furthermore, the tail end of the second guide tube is connected to an airflow inlet / outlet device, which is horn-shaped and has its small-diameter end connected to the second guide tube.

[0016] Furthermore, it also includes a base fixing device, which includes a column and a base plate. The column is installed on the base plate, and a periodic circulation system is installed on the column.

[0017] Beneficial effects: Compared with the prior art, the significant advantages of this invention are: (1) By cooperating with the float assembly and the periodic circulation system, a complete wave cycle can be utilized, which improves the efficiency of wave energy conversion and utilization; (2) By setting up multiple independent float assemblies and internal pneumatic cylinders, the wave can be captured in different directions, overcoming the defect of the prior art that captures waves in a single direction and improving the wave capture efficiency; (3) The pneumatic circulation drive method has a higher wave energy conversion efficiency than the hydraulic system, which improves the wave energy utilization efficiency; (4) Multiple float assemblies share an external cylinder, and the centralized structure improves the stability of operation and saves sea space; (5) The vertical axis Darrieux model generator can capture the kinetic energy generated by the airflow in all directions, which further improves the energy capture and conversion efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the wave energy generation device based on a multi-buoy shared-pressure chamber according to the present invention.

[0019] Figure 2 This is a cross-sectional view of the wave energy generation device based on a multi-buoy shared-pressure chamber according to the present invention;

[0020] Figure 3 This is a top view of the wave energy generation device based on a multi-buoy shared-pressure chamber according to the present invention;

[0021] Figure 4 This is a schematic diagram of the external cylindrical structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the wind turbine structure of the present invention. Detailed Implementation

[0023] like Figures 1 to 3As shown, this embodiment of a wave energy generation device based on a multi-buoy shared pressure chamber includes three float assemblies 1, a periodic circulation system 2, and a base fixing device 3. The periodic circulation system 2 includes an outer cylinder 6 and three internal pressure cylinders 7, a shared pressure chamber 8, and a generator fan 9 installed inside the outer cylinder 6. An mounting plate 11 is provided inside the outer cylinder 6, with its outer diameter equal to the inner diameter of the outer cylinder 6. Three circular holes are opened on the mounting plate 11, through which the internal pressure cylinders 7 are fixedly installed on the mounting plate 11. The three internal pressure cylinders 7 are arranged in a circumferentially spaced manner. A sealed cavity is formed below the mounting plate 11, and the lower parts of the internal pressure cylinders 7, the shared pressure chamber 8, and the generator fan 9 are all located within this sealed cavity. The base fixing device 3 includes a column 17 and a base plate 18. The column 17 is installed on the base plate 18, and the outer cylinders 6 are fixedly connected to the column 17.

[0024] The float assembly 1 includes floats 4 and connecting rods 5. Three floats 4 surround the outer side of the outer cylinder 6, each float occupying a 120° range on the outer wall of the outer cylinder 6. The bottom surface of the float 4 is parabolic in shape. When waves propagate to the float 4, the progressively parabolic surface evenly disperses the force, reducing local stress concentration and improving the durability of the float. Figure 4 As shown, a float partition 12 is provided between adjacent floats 4. The float partition 12 is installed on the outer wall of the outer cylinder 6. A float limiting plate 13 is provided on the top of the float partition 12. The float limiting plate 13 is flush with the top surface of the outer cylinder 6 and is used to limit the highest position of the float 4.

[0025] The connecting rod 5 includes a first connecting rod, a second connecting rod, and a crossbar connecting the first and second connecting rods. The first connecting rod is connected to the float 4, and one end of the second connecting rod is connected to a piston 10, which extends into the internal pneumatic cylinder 7. The axes of the first connecting rod, the second connecting rod, the internal pneumatic cylinder 7, and the external cylinder 6 are parallel to each other. The length of the second connecting rod is greater than the length of the first connecting rod to ensure that the piston 10 is always located inside the internal pneumatic cylinder 7. The length of the float partition 12 along the axis of the external cylinder 6 is greater than the length of the first connecting rod to ensure that adjacent floats 4 are always within the length of the float partition 12 when floating up and down, and are separated by the float partition 12 so as not to affect each other.

[0026] The internal pneumatic cylinder 7 has a piston limiting plate 15 at its top to prevent the piston 10 from detaching from the internal pneumatic cylinder 7 during movement. The length of the internal pneumatic cylinder 7 is greater than the length of the second connecting rod, and when the piston 10 moves to its lowest position, there is still a distance between the piston 10 and the bottom of the internal pneumatic cylinder 7. The internal pneumatic cylinder 7 has a connecting pipe 14 for connecting to the atmosphere. The connecting pipe 14 is L-shaped, and the connection point between the connecting pipe 14 and the internal pneumatic cylinder 7 is lower than the lowest movement position of the piston 10. The other end of the connecting pipe 14 is flush with the top surface of the outer cylinder 6. A one-way valve 21 is provided at the connection point between the connecting pipe 14 and the internal pneumatic cylinder 7, allowing gas to flow from the connecting pipe 14 to the internal pneumatic cylinder 7.

[0027] The common pressure chamber 8 is a cylindrical chamber. The bottoms of the three internal pressure cylinders 7 are all connected to the top of the common pressure chamber 8 through the first guide pipe 19 to collect the air pressure inside the three internal pressure cylinders 7. The bottom of the common pressure chamber 8 is connected to a second guide pipe 20, which is an L-shaped bend pipe. The second guide pipe 20 is connected to the sealed cavity, and its diameter is smaller than that of the common pressure chamber 8. The tail of the second guide pipe 20 is also connected to an airflow inlet / outlet device 16, which is funnel-shaped, and its smaller diameter end is connected to the second guide pipe 20.

[0028] The generator fan 9 is vertically installed at the tail end of the second guide pipe 20, such as... Figure 5 As shown, the wind turbine 9 is a vertical-axis Darrieux model wind turbine, consisting of three blades and a shaft. The axis of the shaft is parallel to the outer casing 6. The blades are curved and rotate around the shaft to generate electricity. According to the independent variable pitch control theory, each blade has its own specific control law to independently change the pitch angle flow. Throughout the complete operating cycle of the device, it can capture the kinetic energy generated by the airflow from all directions and multiple angles, resulting in a high wind energy utilization coefficient and further improving the energy conversion efficiency.

[0029] The working principle of this invention is as follows: In use, the entire device is fixed at a suitable water depth by the base fixing device 3. During a complete wave cycle, as the wave propagates from the crest to the trough, the float 4 moves downward, thereby driving the piston 10, which is connected to it via the connecting rod 5, to move downward. During this process, the one-way valve 21 closes, and the piston 10 compresses the gas in the internal pressure cylinder 7, causing it to flow into the common pressure chamber 8 through the first guide pipe 19, achieving the first acceleration of the gas. Subsequently, as the gas is forced from the common pressure chamber 8 into the second guide pipe 20, according to the flow rate theorem, with a constant flow rate and a smaller pipe diameter, the flow velocity increases, achieving the second acceleration of the gas. Finally, the kinetic energy generated by the superposition of the two accelerations is captured by the generator fan 9 located at the tail end of the second guide pipe 20. At this time, the inside of the device is under high pressure, completing the first power generation of the first half of the wave cycle. As the wave propagates from the trough to the crest, the float 4 moves upward, driving the piston 10 upward. The one-way valve 21 opens, and through the L-shaped connecting pipe 14, the pressure is balanced. Gas, previously under high pressure in the internal sealed chamber, is accelerated into the common pressure chamber 8 through the funnel-shaped airflow inlet / outlet device 16. During this process, the airflow again drives the rotation of the generator fan 9, achieving a second power generation in the latter half of the wave cycle. Through this periodic cycle, the device can effectively utilize the complete wave motion cycle, improving the efficiency of wave energy utilization.

[0030] This invention utilizes a combination of float components and a cyclic circulation system to achieve the utilization of a complete wave cycle, thereby improving the efficiency of wave energy conversion and utilization. By setting up multiple independent float components and an internal pneumatic cylinder, it achieves the capture of incident waves from different directions, overcoming the shortcomings of existing technologies that capture waves in only one direction and improving wave capture efficiency. The pneumatic circulation drive method has a higher wave energy conversion efficiency compared to hydraulic systems, thus improving wave energy utilization efficiency. Multiple float components share a single external cylinder, and the centralized structure improves operational stability and saves marine space. The use of a vertical-axis Darrieux model wind turbine can capture the kinetic energy generated by airflow from all directions, further improving energy capture and conversion efficiency.

Claims

1. A wave energy generation device based on a multi-buoy shared-pressure chamber, characterized in that, The system includes multiple float assemblies (1) and a periodic circulation system (2). The periodic circulation system (2) includes an outer cylinder (6), multiple internal pressure cylinders (7) installed inside the outer cylinder (6), a common pressure chamber (8), and a generator fan (9). An installation plate (11) is provided inside the outer cylinder (6), and the internal pressure cylinders (7) are installed on the installation plate (11). The number of internal pressure cylinders (7) is equal to the number of float assemblies (1). The installation plate (11) forms a sealed cavity at the bottom of the outer cylinder (6). The float assemblies (1) surround the outer side of the outer cylinder (6), and each float assembly (1) is independent of the others. One end of each float assembly (1) is connected to a piston (10), which extends into the outer cylinder. An internal pressure cylinder (7) is provided with a float assembly (1) that drives a piston (10) to move and change the internal pressure of the internal pressure cylinder (7). The internal pressure cylinder (7) is provided with a connecting pipe (14) for connecting to the atmosphere. A one-way valve (21) is provided at the connection between the connecting pipe (14) and the internal pressure cylinder (7). The one-way valve (21) allows gas to flow from the connecting pipe (14) to the internal pressure cylinder (7). The internal pressure cylinder (7) is connected to one side of the common pressure chamber (8) through a first guide pipe (19). A second guide pipe (20) is connected to the other side of the common pressure chamber (8). A generator fan (9) is installed in the second guide pipe (20). The second guide pipe (20) is connected to the sealed cavity.

2. The wave energy generation device based on a multi-buoy shared-pressure chamber as described in claim 1, characterized in that, The float assembly (1) includes a float (4) and a connecting rod (5). The connecting rod (5) includes a first connecting rod connected to the float (4), a second connecting rod connected to the piston (10), and a crossbar connecting the first connecting rod and the second connecting rod. The axes of the first connecting rod, the second connecting rod, the internal air pressure cylinder (7), and the external cylinder (6) are parallel to each other.

3. The wave energy generation device based on a multi-buoy shared-pressure chamber as described in claim 2, characterized in that, The bottom surface of the float (4) is parabolic.

4. The wave energy generation device based on a multi-buoy shared-pressure chamber as described in claim 2, characterized in that, A float partition (12) is provided between adjacent floats (4). The float partition (12) is installed on the outer wall of the outer cylinder (6). A float limiting plate (13) is provided on the top of the float partition (12).

5. The wave energy generation device based on a multi-buoy shared-pressure chamber as described in claim 4, characterized in that, The length of the float partition (12) along the axis of the outer cylinder (6) is greater than the length of the first connecting rod, and the float limiting plate (13) is flush with the top surface of the outer cylinder (6).

6. The wave energy generation device based on a multi-buoy shared-pressure chamber as described in claim 1, characterized in that, The connecting pipe (14) is L-shaped, and the connection between the connecting pipe (14) and the internal air pressure cylinder (7) is lower than the lowest movement position of the piston (10).

7. The wave energy generation device based on a multi-buoy shared-pressure chamber as described in claim 1, characterized in that, The cross-sectional area of ​​the second guide pipe (20) is smaller than the cross-sectional area of ​​the common pressure chamber (8).

8. The wave energy generation device based on a multi-buoy shared-pressure chamber as described in claim 1, characterized in that, The power generation wind turbine (9) is a vertical axis Darrieux model power generation wind turbine, which includes three blades and a rotating shaft. The blades are curved and rotate around the rotating shaft to generate electricity.

9. The wave energy generation device based on a multi-buoy shared-pressure chamber as described in claim 1, characterized in that, The tail end of the second guide tube (20) is connected to an airflow inlet / outlet device (16), which is horn-shaped and has its small diameter end connected to the second guide tube (20).

10. The wave energy generation device based on a multi-buoy shared-pressure chamber as described in claim 1, characterized in that, It also includes a base fixing device (3), which includes a column (17) and a base plate (18). The column (17) is installed on the base plate (18), and the periodic circulation system (2) is installed on the column (17).

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