A wave energy self-charging system based on bilge keel

Abstract

The application discloses a wave energy self-charging system based on bilge keel, and belongs to the technical field of new energy and stability control of ships. The system comprises a composite function bilge keel (1), a transmission module, a power generation module and an energy storage module. The composite function bilge keel has double working modes: in the sailing stability mode, the bilge keel is close to the ship body to suppress rolling; in the berthing power generation mode, the bilge keel is driven to swing by waves to capture energy. The transmission module is composed of an L-shaped force arm (2) and a speed increasing gear set (3), and converts the low-frequency high-torque swing of the bilge keel into high-frequency rotation suitable for a permanent magnet generator (4); the power generation module outputs direct current through a rectifier (5), and lithium battery groups (6) of the energy storage module preferentially supply power to a propulsion system and lighting. Through the structure reform of the bilge keel and the design of the mechanical speed increasing transmission path, the application realizes efficient collection of wave energy and self-sufficiency of energy of the ship in all working conditions, breaks through the limitation of the single function of the traditional bilge keel, has the functions of wave resistance stability improvement and power generation self-supporting capacity, and is suitable for small and medium-sized ships such as ocean fishing boats, coastal patrol boats and sightseeing yachts.

Description

Technical Field

[0001] This invention relates to the field of new energy ships and wave energy utilization technology, specifically to a wave energy self-charging system based on a bilge keel structure, which is suitable for energy replenishment and stability control of small rural electric ships (such as inland river ferries, fishing vessels, short-distance passenger ships, etc.). Background Technology

[0002] Traditional small boats have the following technical drawbacks:

[0003] Energy dependence: Traditional internal combustion engine ships rely on fuel oil, and electric ships need to be charged frequently, neither of which can utilize surface wave energy;

[0004] Insufficient utilization of wave energy: Existing wave energy generation devices are mostly installed independently of the hull (such as float type and oscillating plate type), which disrupts the streamlined shape of the hull and increases navigation resistance;

[0005] Structural and functional disconnect: The bilge keel serves only as a stabilizing component and is not integrated with the energy system, so the energy generated by the hull rolling is not recovered;

[0006] Application limitations: Large ships cannot effectively store and use energy due to continuous navigation, while the intermittent berthing characteristics of small ships have not been specifically utilized.

[0007] Current technology has the following problems:

[0008] Electric boats have short ranges, and charging facilities have low coverage in rural waterways.

[0009] Independent wave energy devices occupy space in the hull and are inefficient;

[0010] Wave energy is not converted into usable energy when ships are anchored;

[0011] Traditional bilge keels only suppress swaying but do not achieve energy recovery. Summary of the Invention

[0012] To address the aforementioned problems, this invention proposes a wave energy self-charging system integrated into the bilge keel, which realizes the dual functions of ship stability control and wave energy power generation, thus solving the energy replenishment problem for small electric ships.

[0013] To achieve the above objectives, the present invention adopts the following technical solution: a wave energy self-charging system based on a bilge keel, comprising:

[0014] Composite functional bilge keel (1): replacing the traditional bilge keel, distributed along the entire length of the bilge section of the hull, and covered with an anti-corrosion layer;

[0015] Transmission module: L-shaped lever arm (2): hinged to the inside of the composite function bilge keel (1); speed-increasing gear set (3): the large gear (31) is connected to the lever arm (2), and the small gear (32) drives the generator (4);

[0016] Power generation module: permanent magnet generator (4) and rectifier (5) to convert mechanical energy into direct current;

[0017] Energy storage module: lithium battery pack (6) and MCU controller (7), the MCU adjusts the charging and discharging strategy in real time, giving priority to the ship's lighting and propulsion system;

[0018] Furthermore, the buoyancy cavity volume of the composite functional bilge keel (1) is matched with the ship's displacement, and the buoyancy block swing amplitude is positively correlated with wave energy. Furthermore, the hinge point of the L-shaped lever arm (2) is made of corrosion-resistant alloy material, allowing the buoyancy block to swing freely within a range of ±25°. Furthermore, the gear ratio of the speed-increasing gear set (3) is 1:10, and when the input speed is 5-15 RPM, the output speed is increased to 50-150 RPM, meeting the minimum starting torque requirement of the generator (4).

[0019] The beneficial effects of this invention are as follows:

[0020] 1. High efficiency in capturing wave energy: The buoyancy design of the composite bilge keel (1) causes it to rise and fall periodically with the action of waves, directly capturing wave kinetic energy; the swing amplitude of the buoyancy block is positively correlated with the wave height, which can amplify the wave energy input by up to 30%, significantly improving the energy collection density;

[0021] 2. Mechanical energy conversion in stages: The L-shaped lever arm (2) converts the oscillation of the buoyancy block into rotational motion. Combined with the 1:10 gear ratio of the speed-increasing gear set (3), it converts low-frequency waves (0.1-0.5 Hz) into high-frequency rotation (50-150 RPM) adapted to the generator, breaking through the bottleneck of low-frequency energy utilization; the mechanical efficiency of the transmission system reaches 85%, which is 40% higher than that of the traditional hinge-hydraulic structure;

[0022] 3. Stable power output: The permanent magnet generator (4) can generate electricity stably at a speed of 50 RPM or more. The output power of the single-sided bilge keel is ≥200 W in sea state 2. The rectifier (5) converts the fluctuating AC power into DC power with a voltage fluctuation rate of <5%, which meets the continuous power supply requirements of the shipboard equipment.

[0023] 4. Energy self-sufficiency closed loop: When the ship is at anchor, the system can self-charge by swinging the bilge keel. The daily power generation can support the operation of the lighting system (total power consumption 1 kW) for 4-6 hours. During navigation, excess power is stored in the lithium battery pack (6), reducing the operating time of the fuel generator and reducing the overall fuel consumption by 15%-20%. Attached Figure Description

[0024] Figure 1 : Schematic diagram of the overall structure of the system of this invention;

[0025] Figure 2 Flowchart of the wave energy conversion and electrical energy transfer logic and control path of the system of this invention;

[0026] Figure 3 : Schematic diagram of the speed-increasing gear set structure of the present invention;

[0027] Figure 4 : Application effect diagram of the embodiment of the present invention. Detailed Implementation

[0028] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0029] Example 1: System Structure and Operating Mode

[0030] Please see Figure 1 This invention provides a wave energy self-charging system based on a bilge keel, suitable for ship navigation or mooring scenarios. The system includes a multi-functional bilge keel (1), a transmission module (2-3), a power generation module (4-5), and an energy storage module (6). The connection relationships of each module are as follows: • Composite bilge keel (1): Distributed along the entire length of the bilge section of the hull, with an internal buoyancy cavity and a surface covered with an anti-corrosion layer; • Transmission module: The L-shaped lever arm (2) is hinged to the inside of the bilge keel (1), and the end is connected to the speed-increasing gear set (3); • Power generation module: The permanent magnet generator (4) is driven by the gear set (3), and the output end is connected to the rectifier (5); • Energy storage module: The lithium battery pack (6) is integrated to receive rectified DC power;

[0031] Example 2: Wave Energy Capture and Mechanical Energy Conversion

[0032] Please see Figure 2 This embodiment details the process of converting wave energy into electrical energy, including the following steps: Step S100: Wave energy input and bilge keel oscillation. • When the ship is moored, the composite bilge keel (1) is subjected to wave action and oscillates periodically (amplitude ±25°), and its buoyancy cavity amplifies the wave energy input; • For example, when the wave height H=1m, the angular velocity ω of the bilge keel can reach 0.5 rad / s, and the mechanical energy input power P1=0.5·ρ·H²·ω (ρ is the density of water).

[0033] Step S200: Oscillation-rotational motion conversion • The L-shaped lever arm (2) converts the swing of the bilge keel (1) into rotational motion, with an input speed of 5-15 RPM; • The speed-increasing gear set (3) increases the speed to 50-150 RPM through a 1:10 gear ratio, driving the permanent magnet generator (4). • For example, the gear module m=2, the large gear (31) has 100 teeth, and the small gear (32) has 10 teeth.

[0034] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A wave energy self-charging system based on a bilge keel, characterized in that, include: Composite function bilge keel (1): It replaces the traditional bilge keel and is continuously distributed along the entire length of the bilge of the hull. It has a buoyancy cavity inside and generates periodic oscillation through wave action. Transmission module: includes an L-shaped lever arm (2) hinged to the inside of the composite functional bilge keel (1), and a speed-increasing gear set (3) connected to the L-shaped lever arm (2), the speed-increasing gear set (3) being configured to convert the oscillation of the bilge keel into high-speed rotational motion; The power generation module includes a permanent magnet generator (4) driven by the speed-increasing gear set (3) and a rectifier (5) connected to the permanent magnet generator (4) for converting mechanical energy into DC power. Energy storage module: includes a lithium battery pack (6) for storing DC power, and a dynamic power management unit connected to the lithium battery pack (6).

2. The wave energy self-charging system according to claim 1, characterized in that: The speed-increasing gear set (3) includes a large gear (31) and a small gear (32). The large gear (31) is connected to the L-shaped lever arm (2), and the small gear (32) is coaxially fixed with the input shaft of the permanent magnet generator (4). The gear ratio of the speed-increasing gear set (3) is configured to convert low-frequency oscillation into high-frequency rotation adapted to the permanent magnet generator (4).

3. The wave energy self-charging system according to claim 1, characterized in that: The mass distribution and buoyancy cavity design of the composite functional bilge keel (1) are configured to generate high torque under wave action and drive the speed-increasing gear set (3) through the L-shaped lever arm (2) to output a speed adapted to the generator starting torque.

4. The wave energy self-charging system according to claim 1, characterized in that: The output of the rectifier (5) is connected to the lithium battery pack (6), and the dynamic power management unit is configured to prioritize power supply to the ship propulsion system and core equipment.

5. The wave energy self-charging system according to claim 1, characterized in that: The streamlined cross section of the composite functional bilge keel (1) is configured to interact with the water flow during oscillation, amplifying the mechanical displacement of the wave energy input.

6. The wave energy self-charging system according to claim 1, characterized in that: The volume of the buoyancy cavity of the composite functional bilge keel (1) is matched with the ship's displacement, and its swing amplitude is positively correlated with wave energy; The hinge point of the L-shaped lever arm (2) is made of corrosion-resistant material, allowing the composite functional bilge keel (1) to swing freely within a preset angle range.

Images