A buoyancy pendulum for a wave power generation device and a wave power generation device

Abstract

The present invention relates to a buoyancy pendulum for a wave power generation device and a wave power generation device, comprising a pendulum body rotatably connected to a shaft, the shaft being fixedly arranged, a first cylinder body and a second cylinder body being arranged in the pendulum body, the first cylinder body being fixed to the pendulum body, the second cylinder body being fixed to the shaft, a plurality of plunger barrels being arranged in the first cylinder body, plungers being slidably connected in the plunger barrels, the spaces in the plunger barrels on both sides of the plungers being fixed to an air compressor, a water pump and the second cylinder body through pipeline assemblies so that water or air can flow into the spaces on both sides of the plungers, the air compressor and the water pump being fixed to the second cylinder body, the water inlet end of the water pump being connected to the water outlet of the second cylinder body through a pipeline, the buoyancy pendulum adopting the present invention has a simple structure and a short maintenance cycle.

Description

Technical Field

[0001] This invention relates to the field of power generation equipment technology, specifically to a buoyancy pendulum for wave power generation and a wave power generation device. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] The buoyancy pendulum wave energy generator works by using the pendulum to swing back and forth under the action of wave force to capture wave energy. The kinetic and potential energy of the pendulum is converted into mechanical or hydraulic energy through a mechanical structure or hydraulic system connected to the pendulum, and then into electrical energy.

[0004] Patent application CN115143021A discloses a buoyancy pendulum wave power generation device, including a column and a pendulum support. The column passes through a support platform. A rotating ring is located at the top of the pendulum support, and the rotating ring is rotatably connected to a fixed cone at its top. A main cable, fixedly connected to the top of the fixed cone, passes through the column and is connected to a main cable tensioning mechanism on the support platform. The main cable drives the pendulum support to move, thereby engaging the pendulum support with a chuck at the bottom of the column. The main cable tensioning mechanism is connected to a control cabinet on the support platform. The inventors discovered that this technology cannot adjust the natural frequency of the pendulum. When the natural frequency of the pendulum is inconsistent with the wave frequency, it will affect the power generation efficiency. Patent CN109973288... Patent B discloses an active resonant C-type buoyancy pendulum wave energy generation device. It adjusts the center of mass of the pendulum body by means of a center of mass adjustment motor, a stabilizing guide rod, a center of mass adjustment screw, and a counterweight, thereby adjusting the resonant frequency. However, the inventors found that in this method, the adjustment motor, adjustment screw, and other components will swing periodically with the pendulum body, which will affect the service life of the adjustment motor, adjustment screw, and other components, resulting in frequent maintenance and increased workload. Moreover, the inventors also found that if the solution in this patent is applied to patent CN115143021A, a special cable channel needs to be set up for the control cable of the adjustment motor to avoid the corrosion of the cable by seawater, which increases the design difficulty of the structure. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a buoyancy pendulum for wave power generation devices, which overcomes the shortcomings of the existing buoyancy pendulum body inherent frequency adjustment technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] In a first aspect, embodiments of the present invention provide a buoyancy pendulum for a wave power generation device, comprising a pendulum body rotatably connected to a shaft, the shaft being fixedly installed, a first cylinder and a second cylinder being installed inside the pendulum body, the first cylinder being fixed to the pendulum body, the second cylinder being fixed to the shaft, a plurality of plunger cylinders being installed inside the first cylinder, a plunger being slidably connected inside the plunger cylinders, and the spaces inside the plunger cylinders on both sides of the plunger being fixed to an air compressor, a water pump and the second cylinder body through a pipeline assembly to allow water or air to be introduced into the spaces on both sides of the plunger, the air compressor and the water pump being fixed to the second cylinder body, and the water inlet of the water pump being connected to the water outlet of the second cylinder body through a pipeline.

[0008] Optionally, a low liquid level sensor and a high liquid level sensor are installed in the second cylinder body. Both the low liquid level sensor and the high liquid level sensor are connected to the controller in the control cabinet, and the control cabinet is fixed to the second cylinder body.

[0009] Optionally, a position detection element is provided inside the plunger cylinder to detect the position information of the plunger. The position detection element is connected to the controller in the control cabinet, and the control cabinet is fixed to the second cylinder body.

[0010] Optionally, the piping assembly is equipped with an electrically controlled switching valve to control the opening and closing of the corresponding piping.

[0011] Optionally, the piping assembly includes a water injection pipe, an air injection pipe, and a vent pipe, wherein the space on one side of the plunger is connected to a water pump through the water injection pipe, to an air compressor through the air injection pipe, and to a second cabinet through the vent pipe; the space on the other side of the plunger is connected to a water pump through the water injection pipe, to an air compressor through the air injection pipe, and to a second cabinet through the vent pipe.

[0012] Optionally, the water injection pipe, air injection pipe, and vent pipe are all equipped with electrically controlled switching valves.

[0013] Optionally, a one-way valve is installed on both the water injection pipe and the air injection pipe.

[0014] Optionally, a flow meter is installed at the outlet of the water pump.

[0015] Optionally, a base is fixed inside the swing body, the base is located above the shaft, and the first cylinder is fixed on the base.

[0016] Secondly, embodiments of the present invention provide a wave power generation device, which is equipped with a buoyancy pendulum for wave power generation as described in the first aspect.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The buoyancy pendulum of the present invention has a plunger cylinder installed in the first cabinet, and a plunger is installed inside the plunger cylinder. The spaces on both sides of the plunger are connected to an air compressor and a water pump, thereby enabling the adjustment of the amount of water and gas in the plunger cylinder. Through the coordinated adjustment of different plunger cylinders, the position of the pendulum's center of mass can be adjusted, thereby adjusting the natural frequency of the pendulum, so that the natural frequency of the buoyancy pendulum is consistent with the wave frequency. Compared with the traditional method of adjusting the position of the pendulum's center of mass by adjusting the lead screw and counterweight, the air compressor, water pump, and second cabinet are all fixed to the shaft and are fixed components, which do not perform periodic oscillation, have a long service life, and extend the maintenance cycle.

[0019] 2. In the buoyancy pendulum of the present invention, the water pump, air compressor, and control cabinet are all fixed to the second cabinet and set inside the cavity of the pendulum body. The corresponding pipelines are protected by the pendulum body and will not be corroded by seawater and the external environment. There is no need to set up pipeline channels for water, air and cables, which reduces the complexity of the structure and the design difficulty. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is a schematic diagram of the overall structure in the initial state of Embodiment 1 of the present invention;

[0022] Figure 2 This is a schematic diagram of the overall structure of the swing state in Embodiment 1 of the present invention;

[0023] Figure 3 This is a schematic diagram of the internal structure of the pendulum body in Embodiment 1 of the present invention;

[0024] Figure 4 This is a schematic diagram of the controller control principle of Embodiment 1 of the present invention;

[0025] Among them, 1. First cylinder body, 2. Second cylinder body, 3. Electrical control cabinet, 4. Air compressor, 5. Water pump, 6. Solenoid valve assembly, 7. Detection assembly, 8. Water inlet pipe, 9. Air outlet pipe, 10. Lower drain pipe, 11. Upper drain pipe; 12. Shaft, 13. Base, 14. Swing body;

[0026] 6_1. Solenoid valve; 6_2. Solenoid valve, 6_3. Solenoid valve, 6_4. Solenoid valve, 6_5. Solenoid valve, 6_6. Solenoid valve, 6_7. Solenoid valve, 6_8. Solenoid valve, 6_9. Solenoid valve, 6_10. Solenoid valve, 6_11. Solenoid valve, 6_12. Solenoid valve, 6_13. Solenoid valve, 6_14. Solenoid valve, 6_15. Solenoid valve, 6_16. Solenoid valve, 6_17. Solenoid valve, 6_18. Solenoid valve, 6_19. Solenoid valve, 6_20. Solenoid valve, 6_21. Solenoid valve, 6_22. Solenoid valve;

[0027] 7_1. Flow meter, 7_2. High liquid level sensor, 7_3. Low liquid level sensor, 7_4. First position detection element, 7_5. Second position detection element, 7_6. Third position detection element;

[0028] 8_1. Water pipe, 8_1_1. Water injection pipe, 8_1_2. Water injection pipe, 8_1_3. Water injection pipe, 8_2. Water pipe, 8_2_1. Water injection pipe, 8_2_2. Water injection pipe, 8_2_3. Water injection pipe;

[0029] 9_1. Trachea, 9_1_1. Inflation tube, 9_1_2. Inflation tube, 9_1_3. Inflation tube, 9_2. Trachea, 9_2_1. Inflation tube, 9_2_2. Inflation tube, 9_2_3. Inflation tube;

[0030] 10_1. Drain pipe, 10_2. Drain pipe, 10_3. Drain pipe;

[0031] 11_1. Drain pipe, 11_2. Drain pipe, 11_3. Drain pipe. Detailed Implementation

[0032] For ease of description, the words "upper" and "lower" appearing in this invention only indicate that they are consistent with the upper and lower directions of the accompanying drawings and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] Example 1

[0034] This embodiment provides a buoyancy pendulum for a wave power generation device, such as... Figure 1-Figure 4 As shown, it includes a pendulum body 14, the bottom of which is rotatably connected to a shaft 12, and can rotate around the axis of the shaft 12. The shaft 12 is fixedly set. The connection method between the pendulum body 14 and the shaft 12 can be achieved using the existing technology of a buoyancy pendulum wave generator, which will not be described in detail here. This embodiment improves the pendulum body.

[0035] The pendulum 14 includes an outer shell, and a base 13 is fixed inside the outer shell. The base 13 is located above the shaft 12 and divides the inner cavity of the outer shell into a first cavity and a second cavity.

[0036] The base 13 has a first cylinder 1 fixed on its upper surface. The first cylinder 1 is located in the first chamber and can move with the rotation of the pendulum 14. The second chamber has a second cylinder 2. The top of the second cylinder 2 is fixed to the shaft 12. Therefore, the second cylinder 2 is fixed and does not move with the rotation of the pendulum 14.

[0037] The first cylinder 1 has a plurality of plunger cylinders 1_1 fixed inside. The axes of the plurality of plunger cylinders 1_1 are parallel to each other, and the axes of the plunger cylinders 1_1 are perpendicular to the base 13. In this embodiment, three plunger cylinders 1_1 are provided, namely the first plunger cylinder, the second plunger cylinder and the third plunger cylinder.

[0038] The plunger cylinder is provided with a plunger 1_2, which is slidably connected to the plunger cylinder 1_1 and can move along the axial direction of the plunger cylinder 1_2.

[0039] The plunger 1_2 divides the space inside the plunger cylinder 1_1 into a first space and a second space. Both the first space and the second space are connected to the air compressor 4, the water pump 5 and the second cylinder 2 through a pipeline assembly, thereby enabling the injection of water or gas into the first space and the second space inside the plunger cylinder 1_1, thereby adjusting the height of the water column inside the plunger cylinder 1_1. Through the coordinated adjustment of multiple plunger cylinders 1_1, the position of the center of mass of the first cylinder 1 can be adjusted, thereby adjusting the position of the center of mass of the entire swing body 14.

[0040] The piping assembly includes a water injection pipe, an air injection pipe, and a venting pipe.

[0041] In the first plunger cylinder:

[0042] The first space of the first plunger cylinder is connected to the water pipe 8_1 through the water injection pipe 8_1_1. The water pipe 8_1 is connected to the water outlet of the water pump. An electrically controlled switch valve is installed on the water injection pipe 8_1_1. The electrically controlled switch valve is a solenoid valve 6_7.

[0043] The first space is connected to the air pipe 9_1 via the air injection pipe 9_1_2. The air pipe 9_1 is connected to the air outlet of the air compressor 4. An electrically controlled switch valve is installed on the air injection pipe 9_1_2. The electrically controlled switch valve is a solenoid valve 6_2.

[0044] The first space is connected to the upper drain pipe 11 via the drain pipe 11_1. The upper drain pipe 11 is connected to the second cylinder. An electrically controlled switch valve is installed on the drain pipe 11_1. The electrically controlled switch valve is a solenoid valve 6_4.

[0045] The second space of the first plunger cylinder is connected to the water pipe 8_2 via the water injection pipe 8_2_3. The water pipe 8_2 is connected to the outlet of the water pump 5 after being connected in parallel with the water pipe 8_1. An electrically controlled switch valve is installed on the water injection pipe 8_2_3. The electrically controlled switch valve is a solenoid valve 6_18.

[0046] The second space is connected to the air pipe 9_2 via the air injection pipe 9_2_3, and the air pipe 9_2 is connected to the air outlet of the air compressor 4. An electrically controlled switch valve is installed on the air injection pipe 9_2_3, and the electrically controlled switch valve is a solenoid valve 6_12.

[0047] The second space is connected to the lower drain pipe 10 via the drain pipe 10_1. The lower drain pipe 10 is connected to the second cylinder 2. An electrically controlled switch valve is installed on the drain pipe 10_1. The electrically controlled switch valve is a solenoid valve 6_13.

[0048] In the second plunger cylinder:

[0049] The first space of the second plunger cylinder is connected to the water pipe 8_1 via the water injection pipe 8_1_2. The water pipe 8_1 is connected to the outlet of the water pump 5. An electrically controlled switch valve is installed on the water injection pipe 8_1_2. The electrically controlled switch valve is a solenoid valve 6_8.

[0050] The first space is connected to the air pipe 9_1 via the air injection pipe 9_1_3. The air pipe 9_1 is connected to the air outlet of the air compressor 4. An electrically controlled switch valve is installed on the air injection pipe 9_1_3. The electrically controlled switch valve is a solenoid valve 6_1.

[0051] The first space is connected to the upper drain pipe 11 via the drain pipe 11_2. The upper drain pipe 11 is connected to the second cylinder. An electrically controlled switch valve is installed on the drain pipe 11_2. The electrically controlled switch valve is a solenoid valve 6_5.

[0052] The second space of the first plunger cylinder is connected to the water pipe 8_2 via the water injection pipe 8_2_2. The water pipe 8_2 is connected to the outlet of the water pump 5 after being connected in parallel with the water pipe 8_1. An electrically controlled switch valve is installed on the water injection pipe 8_2_2. The electrically controlled switch valve is a solenoid valve 6_17.

[0053] The second space is connected to the air pipe 9_2_2 via the air injection pipe 9_2_2, which in turn is connected to the air outlet of the air compressor 4. An electrically controlled switch valve, specifically a solenoid valve 6_11, is installed on the air injection pipe 9_2_2.

[0054] The second space is connected to the lower drain pipe 10 via the drain pipe 10_2. The lower drain pipe 10 is connected to the second cylinder 2. An electrically controlled switch valve is installed on the drain pipe 10_2. The electrically controlled switch valve is a solenoid valve 6_14.

[0055] In the third plunger cylinder:

[0056] The first space of the third plunger cylinder is connected to the water pipe 8_1 via the water injection pipe 8_1_3. The water pipe 8_1 is connected to the outlet of the water pump 5. An electrically controlled switch valve is installed on the water injection pipe 8_1_3. The electrically controlled switch valve is a solenoid valve 6_9.

[0057] The first space is connected to the air pipe 9_1 through the air injection pipe 9_1_1. The air pipe 9_1 is connected to the air outlet of the air compressor 4. An electrically controlled switch valve is installed on the air injection pipe 9_1_1. The electrically controlled switch valve is a solenoid valve 6_3.

[0058] The first space is connected to the upper drain pipe 11 via the drain pipe 11_3. The upper drain pipe 11 is connected to the second cylinder. An electrically controlled switch valve is installed on the drain pipe 11_3. The electrically controlled switch valve is a solenoid valve 6_6.

[0059] The second space of the first plunger cylinder is connected to the water pipe 8_2 via the water injection pipe 8_2_1. The water pipe 8_2 and the water pipe 8_1 are connected in parallel and then connected to the outlet of the water pump 5. An electrically controlled switch valve is installed on the water injection pipe 8_2_1. The electrically controlled switch valve is a solenoid valve 6_16.

[0060] The second space is connected to the air pipe 9_2 via the air injection pipe 9_2_1, and the air pipe 9_2 is connected to the air outlet of the air compressor 4. An electrically controlled switch valve is installed on the air injection pipe 9_2_1, and the electrically controlled switch valve is a solenoid valve 6_10.

[0061] The second space is connected to the lower drain pipe 10 via the drain pipe 10_3. The lower drain pipe 10 is connected to the second cylinder 2. An electrically controlled switch valve is installed on the drain pipe 10_3. The electrically controlled switch valve is a solenoid valve 6_15.

[0062] All water and air injection pipes are equipped with one-way valves to control the flow of gas and water to ensure they flow only in the required direction.

[0063] An electrically controlled switch valve is installed on water pipe 8_1, which is a solenoid valve 6_19. An electrically controlled switch valve is installed on water pipe 8_2, which is a solenoid valve 6_20.

[0064] An electrically controlled switch valve is installed on the trachea 9_1, which is a solenoid valve 6_21. An electrically controlled switch valve is installed on the trachea 9_2, which is a solenoid valve 6_22.

[0065] The water pump is equipped with a flow meter 7_1 at its outlet end to detect the water pump's injection flow rate. The water pump's inlet end is connected to the bottom end of the second cylinder via an inlet pipe 8, enabling water to be pumped from the second cylinder.

[0066] The air compressor has an air outlet pipe 9 at its outlet end, which is connected to two air pipes.

[0067] The flow meter 7_1 is connected to the controller in the electrical control cabinet 3 and can transmit the detected flow information to the controller.

[0068] All electrically controlled switching valves are connected to the controller in electrical control cabinet 3 and can operate by receiving instructions from the controller.

[0069] A first position detection element 7_4 is installed at the bottom of the first plunger cylinder to detect the position of the plunger inside. A second position detection element 7_5 is installed at the bottom of the second plunger cylinder to detect the position of the plunger inside. A third position detection element 7_6 is installed at the bottom of the third plunger cylinder to detect the position of the plunger inside.

[0070] In this embodiment, the first position detection element 7_4, the second position detection element 7_5, and the third position detection element 7_6 are laser rangefinders or other types of distance detection sensors. Those skilled in the art can set them according to actual needs.

[0071] All three position detection elements are connected to the controller and can transmit the detected plunger 1_2 position information to the controller.

[0072] The second cylinder 2 is equipped with a low liquid level sensor 7_3 and a high liquid level sensor 7_2. In this embodiment, "low" and "high" are only relative concepts, referring to the installation height of the high liquid level sensor being higher than that of the low liquid level sensor, without limiting their specific installation height.

[0073] Both the low liquid level sensor 7_3 and the high liquid level sensor 7_2 are connected to the controller and can send signals to the controller. When the water level in the second cylinder 2 reaches the low liquid level sensor, the low liquid level sensor 7_3 sends a signal to the controller, and the controller issues a signal that the liquid level in the second cylinder 2 is too low. When the water level in the second cylinder 2 reaches the high liquid level sensor 7_2, the high liquid level sensor 7_2 sends a signal to the controller, and the controller issues a signal that the liquid level in the second cylinder 2 is too high.

[0074] The water pump 5, air compressor 4 and electrical control cabinet 3 are all fixed to the outer side of the second cylinder 2. They are fixed in place and do not swing with the swing body 14. They do not swing periodically, have a long service life, and basically do not need to consider lubrication and mechanical wear issues. They also have a long maintenance cycle.

[0075] In this embodiment, a flexible hose section is provided on the water pipe, the air pipe, the upper drain pipe, and the lower drain pipe to prevent the corresponding pipes from being broken during the swinging motion. The hose is made of flexible materials such as rubber or silicone, and those skilled in the art can set it according to actual needs.

[0076] Moreover, in this embodiment, the buoyancy pendulum, water pump 5, air compressor 4, and electrical control cabinet 3 are all fixed to the second cabinet 2 and set inside the cavity of the pendulum body. The corresponding pipelines are protected by the pendulum body and will not be corroded by seawater and the external environment. There is no need to set up pipeline channels for water, air and cables, which reduces the complexity of the structure and the design difficulty.

[0077] In this embodiment, multiple solenoid valves together constitute the solenoid valve group 6 of the entire pendulum body. The flow meter 7_1, the low liquid level sensor 7_3, the high liquid level sensor 7_2, the first position detection element 7_4, the second position detection element 7_5, and the third position detection element 7_6 together constitute the detection component 7 of the entire pendulum body. Both the solenoid valve group 6 and the detection component 7 are connected to the controller in the electrical control cabinet 3.

[0078] The working method of the buoyancy pendulum in this embodiment is as follows:

[0079] (1) Ensure that the buoyancy pendulum resonates with the waves under normal sea conditions.

[0080] The natural frequency of the buoyancy pendulum and the corresponding data and adjustment methods for the height and position of the liquid column in plunger cylinder 1_1 have been converted into control program instructions and stored in the controller of electrical control cabinet 3. For example... Figure 3 As shown, the controller in electrical control cabinet 3 receives wave frequency and wave height signals in real time and calculates the wave energy density. The wave frequency and wave height signals are obtained through wave parameter measurement sensors on buoys placed in the working area, which can be achieved using existing technology. The wave energy density is obtained using existing theoretical calculation methods, which will not be described in detail here. If the wave energy density is not greater than the set value, it is considered that the current sea state is normal. Based on the latest wave frequency and the current liquid column height and position data in the plunger cylinder, the controller of the control system automatically adjusts the liquid column height and position in the plunger cylinder at set intervals. Specifically, the typical wave frequency of the sea area where the wave power generation equipment is located is pre-divided into multiple discrete values, and the position of the center of mass when the natural frequency of the entire pendulum reaches the corresponding wave frequency is pre-calculated. The liquid column height value in each plunger cylinder is pre-calculated from the position of the center of mass (selecting a set of reasonable matching values). If the current actual wave frequency is very close to a certain pre-divided wave frequency discrete value, it is considered that the liquid column height in the plunger cylinder should be set using that wave frequency discrete value. If the current liquid column height in the plunger does not deviate significantly from the desired set value, directly adjust the current liquid column height in the plunger to reach the set target value. If the target cannot be achieved through direct adjustment, first empty or fill the plunger cylinder, and then adjust it to the set target value. This completes the adjustment of the center of mass position of the first cylinder 1, allowing the natural frequency of the buoyancy pendulum to match the wave frequency, maintaining a resonant state. Now, let's take... Figure 3 Taking the adjustment of water column height and position as an example, when the plunger in the leftmost first plunger cylinder is at the bottom, the implementation process of the scheme is discussed under different circumstances.

[0081] a. The plunger is located at the bottom of the first plunger cylinder, with air above plunger 1_2. Assuming that a water column of a certain height needs to be formed at the bottom of the first plunger cylinder to achieve buoyancy pendulum resonance with the wave, the controller of the electrical control cabinet 3 issues a command to open solenoid valves 6_20, 6_18, and 6_4, and start water pump 5 to inject a certain amount of water from the second cylinder into the first plunger cylinder through inlet pipe 8, water pipe 8_2, and injection pipe 8_2_3. At the same time, the air above plunger 1_2 is released into the second cylinder 2 through vent pipe 11_1 and upper vent pipe 11. The amount of water injected into the first plunger cylinder is monitored and recorded by flow meter 7_1. When the set value is reached, the water pump stops working, the solenoid valves close, and the first position detection element 7_4 provides feedback and records the plunger position.

[0082] b. Plunger 1_2 is located at the bottom of the plunger cylinder, with water above it. Assuming that a certain height of water column needs to be formed at the bottom of the first plunger cylinder to achieve resonance between the buoyancy pendulum and the wave, the controller of the electrical control cabinet 3 issues a command to open solenoid valves 6_20, 6_18, and 6_4, and start water pump 5 to inject water from water tank 2 into the first plunger cylinder through inlet pipe 8, water pipe 8_2, and injection pipe 8_2_3, until all the water above the plunger is discharged into water tank 2 through drain pipe 11_1 and upper drain pipe 11. Then, water pump 5 stops working and solenoid valves 6_20, 6_18, and 6_4 are closed. Open solenoid valves 6_21, 6_2, and 6_13 to start air compressor 4. Air is injected into the first plunger cylinder through outlet pipe 9, air pipe 9_1, and air injection pipe 9_1_2. Simultaneously, water at the bottom of the plunger is drained into the second cylinder 2 through drain pipe 10_1 and lower drain pipe 10 until the plunger moves to the designated position. Air compressor 4 then stops working and closes solenoid valves 6_21, 6_2, and 6_13. The injected water volume is monitored and recorded by flow meter 7_1, and the first position detection element 7_4 provides feedback and records the current plunger position.

[0083] For a single plunger cylinder, the current plunger position can be categorized into three cases: bottom, top, or some intermediate position. The medium on either side of the plunger may differ in each case, and the target liquid column height and position will also vary depending on the wave frequency. For multiple plunger cylinders, the adjustment conditions become even more numerous. Regardless of the condition, after adjusting the natural frequency of the buoyancy pendulum, the control system records the liquid level height and position of each plunger cylinder. Based on the target liquid column height and position, under the control of the controller in electrical control cabinet 3, through the coordination of the air compressor, water pump, solenoid valve group, sensor group, water pipe, air pipe, water injection pipe, air injection pipe, vent pipe, lower vent pipe, and upper vent pipe, a water column of a certain height and position can be formed in the plunger cylinder, thus completing the adjustment of the buoyancy pendulum's natural frequency. The implementation principles of various conditions are consistent with the examples above and will not be repeated.

[0084] (2) Energy input control of buoyancy pendulum under severe sea conditions.

[0085] like Figure 3 As shown, the controller inside control cabinet 3 receives wave frequency and wave height signals in real time and calculates the wave energy density. If the wave energy density is greater than the set value, it is considered that the current sea state is severe. Based on the latest wave frequency and the current liquid column height and position data in the plunger cylinder, the controller automatically adjusts the liquid column height and position in the plunger cylinder at set intervals, that is, it adjusts the position of the center of mass of the first cylinder, so that the natural frequency of the buoyancy pendulum is inconsistent with the wave frequency, deviating from the resonance state. The greater the difference between the pendulum's natural frequency and the wave frequency, the less energy the pendulum absorbs; the smaller the difference, the more energy the pendulum absorbs. By adjusting the height and position of the liquid column in the plunger cylinder, the degree of deviation between the pendulum's natural frequency and the wave frequency can be adjusted, thus controlling the energy input to the pendulum under severe sea conditions, thereby providing a certain degree of protection for the wave power generation device.

[0086] The method and process for adjusting the deviation between the natural frequency of the buoyancy pendulum and the wave frequency are the same as those for ensuring resonance between the pendulum and the waves under normal sea conditions, except that the height and position of the target liquid column to be adjusted in the plunger cylinder are different, and will not be repeated here.

[0087] Example 2

[0088] This embodiment provides another wave power generation device, which is a buoyancy pendulum wave power generation device. It is equipped with the buoyancy pendulum of the wave power generation device shown in Embodiment 1. Other structures of the wave power generation device can be obtained using existing technology, and will not be described in detail here.

[0089] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A buoyancy pendulum for a wave power generation device, comprising a pendulum body rotatably connected to an axis, the axis being fixedly installed, characterized in that, The swing body is equipped with a first cylinder and a second cylinder. The first cylinder is fixed to the swing body, and the second cylinder is fixed to the shaft. The first cylinder is equipped with multiple plunger cylinders, and plungers are slidably connected inside the plunger cylinders. The spaces inside the plunger cylinders on both sides of the plunger are fixed to the air compressor, water pump and the second cylinder through pipeline assemblies so that water or air can be introduced into the spaces on both sides of the plunger. The air compressor and water pump are fixed to the second cylinder, and the water inlet of the water pump is connected to the water outlet of the second cylinder through pipeline. The pipeline assembly includes a water injection pipe, an air injection pipe, and a vent pipe. The space on one side of the plunger is connected to the water pump through the water injection pipe, to the air compressor through the air injection pipe, and to the second cylinder through the vent pipe. The space on the other side of the plunger is connected to the water pump through the water injection pipe, to the air compressor through the air injection pipe, and to the second cylinder through the vent pipe.

2. The buoyancy pendulum for a wave power generation device as described in claim 1, characterized in that, The second cylinder is equipped with a low liquid level sensor and a high liquid level sensor. Both the low liquid level sensor and the high liquid level sensor are connected to the controller in the control cabinet. The control cabinet is fixed to the second cylinder.

3. The buoyancy pendulum for a wave power generation device as described in claim 1, characterized in that, The plunger cylinder is equipped with a position detection element for detecting the position information of the plunger. The position detection element is connected to the controller in the control cabinet, and the control cabinet is fixed to the second cylinder body.

4. A buoyancy pendulum for a wave power generation device as described in claim 1, characterized in that, The piping assembly is equipped with an electrically controlled switching valve to control the opening and closing of the corresponding piping.

5. A buoyancy pendulum for a wave power generation device as described in claim 1, characterized in that, The water injection pipe, air injection pipe, and venting pipe are all equipped with electrically controlled switching valves.

6. A buoyancy pendulum for a wave power generation device as described in claim 1, characterized in that, Both the water injection pipe and the air injection pipe are equipped with one-way valves.

7. A buoyancy pendulum for a wave power generation device as described in claim 1, characterized in that, A flow meter is installed at the outlet of the water pump.

8. A buoyancy pendulum for a wave power generation device as described in claim 1, characterized in that, A base is fixed inside the swing body, and the base is located above the shaft. The first cylinder is fixed on the base.

9. A wave power generation device, characterized in that, The wave power generation device is equipped with a buoyancy pendulum as described in any one of claims 1-8.

Images