Pneumatic buffering and energy recycling mechanism and control method thereof

Abstract

The application relates to a kind of pneumatic buffering and energy recycling mechanism and its control method, it includes wave energy conversion device, oscillating buoy, pneumatic cylinder, gas interaction device, gas storage tank and for control system, wave energy conversion device is arranged on offshore platform, the upper end of oscillating buoy is fixedly connected with the lower end of wave energy conversion device, the upper end of wave energy conversion device is connected with pneumatic cylinder, gas interaction device is arranged between pneumatic cylinder and gas storage tank, gas interaction device is communicated with pneumatic cylinder and gas storage tank.The application in actual use, oscillating buoy oscillates up and down under the action of wave, wave energy conversion device converts the mechanical energy of oscillating buoy into electric energy;Control gas interaction device adjusts airflow direction, when wave is too large, gas storage tank and pneumatic cylinder provide force in the opposite direction of oscillating buoy movement, realize the function of buffering, when small wave, give oscillating buoy the same force in the direction of movement, improve power generation efficiency, help to solve the problem of unstable energy recovery efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy power generation, in particular to a pneumatic buffering and energy recycling mechanism and a control method thereof. BACKGROUND

[0002] Wave energy has a very broad development and utilization potential due to its huge reserves. Since the 1960s, there have been many related researches carried out. According to the statistical data of the European Marine Energy Center, there are more than 200 types of wave energy devices, which can be divided into 9 categories. Most of the wave energy devices are to capture wave energy through the oscillation movement of rigid floating bodies. For this type of wave energy device with oscillation movement of rigid floating bodies, the motion response of the energy capturing mechanism as the first link directly affects the energy capturing effect. Most of the current energy capturing mechanisms have a motion stroke limit. In extreme sea conditions, the wave force acting on the energy capturing mechanism is large. Even if it moves to the maximum stroke, it still has a large impact force. The end of the energy capturing mechanism and the PTO will produce a certain impact damage. The safety cannot be guaranteed in the long run. In addition, under smaller waves, the wave force acting on the energy capturing mechanism is small, the power generation is low, and even the power generation conditions cannot be met. Therefore, the existing energy capturing mechanisms generally have the problem of unstable energy recovery, and there is room for improvement. SUMMARY

[0003] In order to solve the problem of unstable energy recovery efficiency, the present application provides a pneumatic buffering and energy recycling mechanism and a control method thereof.

[0004] The pneumatic buffering and energy recycling mechanism provided by the present application adopts the following technical scheme:

[0005] A pneumatic buffering and energy recycling mechanism, comprising

[0006] An oscillating floating body for placing on a water body and floating up and down with the water body waves;

[0007] A wave energy conversion device connected with the oscillating floating body, and the wave energy conversion device is used to convert the mechanical energy of the oscillating floating body into electrical energy; characterized in that it further comprises

[0008] A gas storage tank for storing or releasing gas

[0009] A pneumatic cylinder comprising a cylinder body and a piston assembly, the piston assembly is connected with the oscillating floating body and moves up and down in the interior of the cylinder body of the pneumatic cylinder, and the piston assembly divides the interior of the cylinder body into an upper cavity and a lower cavity;

[0010] A gas interaction device, which is connected to a gas storage tank and a pressure cylinder, and is used to connect the upper cavity to the gas storage tank or the external environment, and to connect the lower cavity to the gas storage tank or the external environment.

[0011] A control system for controlling the gas interaction device.

[0012] By adopting the above technical solution, in actual use, the oscillating float oscillates up and down relative to the offshore platform under the action of waves. The mechanical energy of the oscillating float is converted into other forms of energy through the wave energy conversion device, and finally converted into electrical energy output. The control system controls the gas interaction device to adjust the airflow direction. When the waves are large, the gas storage tank is connected to the pressure cylinder. The gas storage tank is filled with air and provides a force in the opposite direction of the oscillating float's movement, realizing the buffering function. When the waves are small, the gas storage tank is depressurized, the pressure cylinder is filled with air and provides a force in the same direction as the oscillating float's movement, improving the power generation efficiency of the wave energy conversion device and helping to solve the problem of unstable energy recovery efficiency.

[0013] Preferably, the wave energy conversion device includes a sliding component and a fixed component that moves relative to the sliding component. The fixed component is installed on a sea platform. The upper end of the sliding component is connected to a pneumatic cylinder, and the lower end of the sliding component is connected to an oscillating float.

[0014] By adopting the above technical solution, in actual use, the oscillating float oscillates up and down relative to the offshore platform under the action of waves, and the oscillating float drives the sliding component to move relative to the fixed component, and converts the mechanical energy of the sliding component into other energy, thus realizing the energy conversion function of this device.

[0015] Preferably, the control system includes a controller, a wave prediction device for acquiring wave height, a displacement sensor for acquiring piston assembly position, and a drive circuit. The wave prediction device and displacement sensor are connected to the input terminal of the controller, the input terminal of the drive circuit is connected to the output terminal of the controller, and the gas interaction device is connected to the output terminal of the drive circuit.

[0016] By adopting the above technical solution, in practical use, the wave prediction device, displacement sensor and drive circuit are used to realize the functions of automatically collecting wave height, collecting piston position and controlling gas interaction device, which greatly improves the automation of the device.

[0017] A pneumatic buffering and energy recovery and reuse method, characterized in that when the oscillating buoy moves upward, it includes the following steps:

[0018] S1. The wave prediction device analyzes and compares wave heights;

[0019] If the wave height is greater than the upper limit of wave height, proceed to step S2;

[0020] If the wave height is less than the lower limit of wave height, proceed to step S3;

[0021] When the wave height is within the specified range, proceed to step S4;

[0022] S2. The upper chamber of the pneumatic cylinder is connected to the air storage tank, and the lower chamber is connected to the external environment. The oscillating float outputs power to the wave energy conversion device and the pneumatic cylinder. The gas in the upper chamber of the pneumatic cylinder is compressed into the air storage tank.

[0023] S3. The lower chamber of the pneumatic cylinder is connected to the air storage tank, and the upper chamber is connected to the external environment. The gas in the air storage tank applies an upward force to the piston assembly. The piston assembly and the oscillating float jointly output power to the wave energy conversion device.

[0024] S4. Both the upper and lower chambers of the pneumatic cylinder are connected to the external environment, while the air storage tank is in a non-conductive state.

[0025] S5. Repeat the above steps in the next wave.

[0026] By adopting the above technical solution, in actual use, when the wave height is greater than the upper limit and the piston moves upward, the upper chamber of the pneumatic cylinder is connected to the air tank, and the air tank is filled with air and plays a buffering role; when the wave height is less than the lower limit and the piston moves upward, the lower chamber of the pneumatic cylinder is connected to the air tank, and the air tank is released to assist the movement of the oscillating float; when the wave height is within a suitable range, regardless of whether the piston moves upward or downward, the pneumatic cylinder is connected to the outside world, and the air tank is not connected. This process ensures the power generation function under normal conditions on the one hand, and realizes the functions of filling and buffering when the wave height exceeds the upper limit and assisting in power generation when the wave height is less than the lower limit on the other hand.

[0027] Preferably, when the oscillating buoy moves downward, the following steps are included:

[0028] S11. The wave prediction device analyzes and compares wave heights;

[0029] When the wave height is greater than the upper limit of wave height, proceed to step S12;

[0030] When the wave height is less than the lower limit of wave height, proceed to step S13;

[0031] When the wave height is within the specified range, proceed to step S14;

[0032] S12. The lower chamber of the pneumatic cylinder is connected to the air storage tank, and the upper chamber is connected to the external environment. The oscillating float outputs power to the wave energy conversion device and the pneumatic cylinder. The gas in the lower chamber of the pneumatic cylinder is compressed into the air storage tank.

[0033] S13. The upper chamber of the pneumatic cylinder is connected to the air storage tank, and the lower chamber is connected to the external environment. The gas in the air storage tank applies a downward force to the piston assembly. The piston assembly and the oscillating float jointly output power to the wave energy conversion device.

[0034] S14. The upper and lower chambers of the pneumatic cylinder are both connected to the external environment, while the air storage tank is in a non-conductive state.

[0035] S15. Repeat the above steps in the next wave.

[0036] By adopting the above technical solution, in actual use, when the wave height is greater than the upper limit and the piston moves downward, the lower chamber of the pneumatic cylinder is connected to the air tank, and the air tank is filled with air and plays a buffering role; when the wave height is less than the lower limit and the piston moves downward, the upper chamber of the pneumatic cylinder is connected to the air tank, and the air tank is released to assist the movement of the oscillating float; when the wave height is within a suitable range, regardless of whether the piston moves upward or downward, the pneumatic cylinder is connected to the outside world, and the air tank is not connected. This process ensures the power generation function under normal conditions on the one hand, and realizes the functions of filling and buffering when the wave height exceeds the upper limit and assisting in power generation when the wave height is less than the lower limit on the other hand.

[0037] Preferably, the wave prediction device collects wave information for a future period of time and transmits it to the controller, while the displacement sensor collects the position and direction of movement information of the piston and transmits it to the controller.

[0038] By adopting the above technical solution, in practical use, the wave prediction device and displacement sensor are used to realize the functions of automatically collecting wave height, collecting piston position and controlling gas interaction device, which greatly improves the automation of the device.

[0039] Preferably, in step S2 or S12, when the pressure of the gas storage tank reaches the upper limit of safety pressure, the gas in the pneumatic cylinder is connected to the external environment.

[0040] By adopting the above technical solution, in actual use, the overflow valve allows the gas in the pressure cylinder to be released to the outside when the pressure of the gas storage tank reaches the safe upper limit pressure. This helps to prevent safety accidents caused by excessive pressure and improves the safety of the device.

[0041] Preferably, in step S3 or S13, when the pressure of the gas storage tank reaches the lower safety limit pressure or the piston passes the middle position of the pneumatic cylinder, step S4 or S14 is executed.

[0042] By adopting the above technical solution, in actual use, when the pressure of the gas storage tank reaches the lower safety limit pressure, the gas storage tank will not conduct electricity, preventing safety accidents caused by insufficient pressure in the gas storage tank and helping to improve the safety of this device.

[0043] In summary, this application includes at least one of the following beneficial technical effects:

[0044] 1. In practical use, the oscillating float oscillates relative to the offshore platform under the action of waves. The mechanical energy of the oscillating float is converted into other forms of energy through a wave energy conversion device, and finally into electrical energy output. The control system controls the gas interaction device to adjust the airflow direction. When the waves are large, the gas tank is connected to the pressure cylinder. The gas tank is filled with air and provides a force in the opposite direction of the oscillating float's movement, realizing a buffering function. When the waves are small, the gas tank is depressurized, the pressure cylinder is filled with air and provides a force in the same direction as the oscillating float's movement, improving the power generation efficiency of the wave energy conversion device and helping to solve the problem of unstable energy recovery efficiency.

[0045] 2. By using the overflow valve, steps S4 and S14, the gas storage tank can maintain a relatively safe pressure state when the pressure is too high or too low, preventing safety accidents caused by excessive or insufficient pressure in the gas storage tank. This helps to improve the service life of the device, as well as its practicality and safety. Attached Figure Description

[0046] Figure 1 This is a schematic diagram illustrating a pneumatic buffer and energy recovery and reuse mechanism, which is a key feature of this application.

[0047] Figure 2 This is a schematic diagram illustrating a pneumatic buffer and energy recovery and reuse mechanism, which is a key feature of this application.

[0048] Figure 3 This is a flowchart illustrating a control method for pneumatic buffering and energy recovery and reuse, which is the main embodiment of this application.

[0049] Figure 4 The main embodiment of this application is shown in the power generation waveform diagram.

[0050] Reference numerals: 1. Oscillating float; 2. Wave energy conversion device; 21. Sliding component; 22. Fixed component; 3. Pneumatic cylinder; 31. Piston assembly; 311. Piston; 312. Upper cavity; 313. Lower cavity; 32. Upper connecting rod; 33. Lower connecting rod; 4. Gas interaction device; 41. First electromagnetic air exchange valve; 411. First transition air inlet; 412. Second transition air inlet; 413. First transition air outlet; 414. Second transition air outlet; 42. Second electromagnetic air exchange valve; 421. First air inlet; 422. First air outlet; 423. Second air outlet; 43. Third electromagnetic air exchange valve; 431. Second air inlet; 432. Third air outlet; 433. Fourth air outlet; 44. Overflow valve; 45. Inflation check valve; 46. Deflation check valve; 5. Gas storage tank. Detailed Implementation

[0051] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0052] This application discloses a pneumatic buffer and energy recovery and reuse mechanism.

[0053] Reference Figure 1 and Figure 2 The pneumatic buffer and energy recovery and reuse mechanism includes a wave energy conversion device 2 for converting wave energy into electrical energy, an oscillating float 1 that oscillates up and down relative to the wave energy conversion device 2, a pneumatic cylinder 3, a gas interaction device 4 for adjusting the airflow direction, a gas storage tank 5 for storing or releasing pressurized gas, and a control system for collecting various data. The wave energy conversion device 2 includes a sliding component 21 and a fixed component 22 that moves relative to the sliding component 21. The fixed component 22 is installed on the offshore platform. The upper end of the sliding component 21 is connected to the pneumatic cylinder 3, and the lower end of the sliding component 21 is connected to the oscillating float 1. A piston assembly 31 is provided inside the pneumatic cylinder 3. The piston assembly 31 includes a piston 311 that moves up and down inside the pneumatic cylinder 3. The piston 311 divides the interior of the pneumatic cylinder 3. The system comprises an upper cavity 312 and a lower cavity 313. An upper connecting rod 32 and a lower connecting rod 33 are fixedly mounted at both ends of the piston 311 in the height direction. The upper connecting rod 32 and the lower connecting rod 33 pass through the upper cavity 312 and the lower cavity 313, respectively. The lower connecting rod 33 of the pneumatic cylinder 3 is connected to the sliding component 21. A gas interaction device 4 is located between the pneumatic cylinder 3 and the gas storage tank 5, and is connected to both the pneumatic cylinder 3 and the gas storage tank 5. The control system includes a controller, a wave prediction device for acquiring wave height, a displacement sensor for acquiring the position of the piston 311, and a drive circuit. The wave prediction device and the displacement sensor are connected to the input terminal of the controller, the input terminal of the drive circuit is connected to the output terminal of the controller, and the gas interaction device 4 is connected to the output terminal of the drive circuit.

[0054] In practical use, the oscillating float 1 oscillates relative to the offshore platform under the action of waves. The mechanical energy of the oscillating float 1 is converted into other forms of energy through the wave energy conversion device 2, and finally converted into electrical energy output. The control system adjusts the airflow direction by controlling the gas interaction device 4 according to the wave height. When the wave is large and the piston 311 moves upward, the airflow direction is adjusted by controlling the gas interaction device 4. The air tank 5 is connected to the pressure cylinder 3, and the upper cavity 312 of the pressure cylinder 3 is compressed. The air tank 5 is filled with air and provides a force to the piston 311 in the opposite direction of movement. When the wave is large and the piston 311 moves upward, the airflow direction is adjusted by controlling the gas interaction device 4. During downward movement, the airflow direction is adjusted by controlling the gas interaction device 4. The gas storage tank 5 is connected to the pressure cylinder 3, and the lower chamber 313 of the pressure cylinder 3 is compressed. The gas storage tank 5 is filled with air and achieves a buffering function. When the waves are small and the piston 311 moves upward, the gas storage tank 5 releases air to fill the lower chamber 313 of the pressure cylinder 3. When the waves are small and the piston 311 moves downward, the gas storage tank 5 releases air to fill the upper chamber 312 of the pressure cylinder 3, thereby providing a force to the piston 311 in the same direction of movement. This specifically realizes the function of improving the power generation efficiency of the wave energy conversion device 2 and helps to solve the problem of unstable energy recovery efficiency.

[0055] refer to Figure 1 and Figure 2The gas interaction device 4 includes a first electromagnetic air exchange valve 41, a second electromagnetic air exchange valve 42, a third electromagnetic air exchange valve 43, an inflation check valve 45, an venting check valve 46, and an overflow valve 44. The first electromagnetic air exchange valve 41, the second electromagnetic air exchange valve 42, and the third electromagnetic air exchange valve 43 are all connected to the output terminal of the drive circuit. The first electromagnetic air exchange valve 41 is configured as a two-position four-way electromagnetic air exchange valve. The first electromagnetic air exchange valve 41 has a first transition inlet 411, a second transition inlet 412, a first transition outlet 413, and a second transition outlet 414. When the first electromagnetic air exchange valve 41 is not energized, the first transition inlet 411 and the first transition outlet... 413 is connected, the second transition air inlet 412 and the second transition air outlet 414 are connected, when the first electromagnetic air exchange valve 41 is energized, the first transition air inlet 411 and the second transition air outlet 414 are connected, the second transition air inlet 412 and the first transition air outlet 413 are connected, the second electromagnetic air exchange valve 42 and the third electromagnetic air exchange valve 43 are both set as two-position three-way electromagnetic air exchange valves, the second electromagnetic air exchange valve 42 has a first air inlet 421, a first air outlet 422 and a second air outlet 423, when the second electromagnetic air exchange valve 42 is not energized, the first air inlet 421 and the second air outlet 423 are connected, the second electromagnetic air exchange valve 42 When energized, the first air inlet 421 is connected to the first air outlet 422. The third electromagnetic air exchange valve 43 has a second air inlet 431, a third air outlet 432, and a fourth air outlet 433. When the third electromagnetic air exchange valve 43 is not energized, the second air inlet 431 and the fourth air outlet 433 are connected. When the third electromagnetic air exchange valve 43 is energized, the second air inlet 431 and the third air outlet 432 are connected. The first transition air inlet 411 and the second transition air inlet 412 on the first electromagnetic air exchange valve 41 are connected to the upper cavity 312 and the lower cavity 313 of the pneumatic cylinder 3, respectively. The first transition air outlet 413 and the second transition air outlet 422 on the first electromagnetic air exchange valve 41 are connected to the upper cavity 312 and the lower cavity 313 of the pneumatic cylinder 3, respectively. The second transition outlet 414 is connected to the first inlet 421 of the second electromagnetic air exchange valve 42 and the second inlet 431 of the third electromagnetic valve, respectively. The first outlet 422 of the second electromagnetic air exchange valve 42 is connected to the venting check valve 46 and the second outlet 423 of the second electromagnetic air exchange valve 42 is connected to the outside. The third outlet 432 of the third electromagnetic air exchange valve 43 is connected to the inflation check valve 45 and the fourth outlet 433 of the third electromagnetic air exchange valve 43 is connected to the outside. Both the inflation check valve 45 and the venting check valve 46 are connected to the air storage tank 5. The overflow valve 44 is connected to the air storage tank 5 and is arranged in parallel with the inflation check valve 45 and the venting check valve 46.

[0056] In practical use, when the waves are large and the piston 311 moves upward, the first electromagnetic air exchange valve 41 and the third electromagnetic air exchange valve 43 are energized, compressing the upper chamber 312 of the pneumatic cylinder 3. The gas in the upper chamber 312 then passes through the first electromagnetic air exchange valve 41, the third electromagnetic air exchange valve 43, and the inflation check valve 45, thereby inflating the air tank 5. Simultaneously, the air in the upper chamber 312 experiences increasing pressure during compression, providing a force opposite to the direction of piston 311's movement. When the waves are large and the piston 311 moves downward, energizing the third electromagnetic air exchange valve 43 connects the air tank 5 to the lower chamber 313 of the pneumatic cylinder 3. 13 is compressed to achieve a buffering function; when the waves are small and the piston 311 moves upward, the first electromagnetic air exchange valve 41 and the second electromagnetic air exchange valve 42 are energized, and the gas in the gas storage tank 5 is vented through the venting check valve 46, the second electromagnetic air exchange valve 42 and the first electromagnetic air exchange valve 41 to fill the lower chamber 313 of the pneumatic cylinder 3 with air and provide upward power. When the waves are small and the piston 311 moves downward, the second electromagnetic air exchange valve 42 is energized, and the gas in the gas storage tank 5 fills the upper chamber 312 of the pneumatic cylinder 3 with air and provides a force to the piston 311 in the same direction of movement, thereby achieving the function of auxiliary power generation and specifically realizing the function of improving the power generation efficiency of the wave energy conversion device 2.

[0057] The controller includes a comparison unit and a main control unit. The comparison unit is used to compare the wave height collected by the wave prediction device with the set upper and lower limits of the wave height and the position of the piston 311 collected by the sensor with the middle position of the pneumatic cylinder 3, and output the comparison result. The main control unit is used to drive the circuit to control the state of the first electromagnetic air exchange valve 41, the second electromagnetic air exchange valve 42 and the third electromagnetic air exchange valve 43. The output terminal of the wave prediction device and the output terminal of the displacement sensor are both connected to the input terminal of the comparison unit. The output terminal of the comparison unit is connected to the input terminal of the main control unit. The input terminal of the drive circuit is connected to the output terminal of the main control unit.

[0058] In practical use, the comparison unit specifically implements the function of comparing the wave height collected by the wave prediction device with the set upper and lower limits of the wave height and the position of the piston 311 collected by the sensor with the middle position of the pneumatic cylinder 3, and outputting the comparison result. The output result is transmitted to the drive circuit through the main control unit to change the state of the gas interaction device 4, thereby completing the functions of buffering and auxiliary power generation.

[0059] The implementation principle of the pneumatic buffer and energy recovery and reuse mechanism in this application embodiment is as follows: In actual use, the oscillating float 1 oscillates up and down relative to the offshore platform under the action of waves. The mechanical energy of the oscillating float 1 is converted into other forms of energy through the wave energy conversion device 2, and finally converted into electrical energy output. The control system adjusts the airflow direction by controlling the gas interaction device 4 according to the size of the wave height. When the wave is large and the piston 311 moves upward, the first electromagnetic air exchange valve 41 and the third electromagnetic air exchange valve 43 are energized, the upper cavity 312 of the pneumatic cylinder 3 is compressed, and the gas in the upper cavity 312 passes through the first electromagnetic air exchange valve 41, the third electromagnetic air exchange valve 43 and the inflation check valve 45, thereby filling the air storage tank 5. At the same time, the air in the upper cavity 312 increases in pressure during the compression process, thereby providing a force to the piston 311 in the opposite direction of movement. When the waves are large and the piston 311 moves downward, the third electromagnetic air exchange valve 43 is energized, connecting the air tank 5 to the lower chamber 313 of the pneumatic cylinder 3. The lower chamber 313 of the pneumatic cylinder 3 is compressed, achieving a buffering function. When the waves are small and the piston 311 moves upward, the first electromagnetic air exchange valve 41 and the second electromagnetic air exchange valve 42 are energized. The gas in the air tank 5 is then vented through the venting check valve 46, the second electromagnetic air exchange valve 42, and the first electromagnetic air exchange valve 41 to inflate the lower chamber 313 of the pneumatic cylinder 3, providing upward power. When the waves are small and the piston 311 moves downward, the second electromagnetic air exchange valve 42 is energized, and the gas in the air tank 5 inflates the upper chamber 312 of the pneumatic cylinder 3, thus providing a force to the piston 311 in the same direction of movement. This specifically improves the power generation efficiency of the wave energy conversion device 2 and helps solve the problem of unstable energy recovery efficiency.

[0060] This application discloses a pneumatic buffering and energy recovery and reuse method, referring to... Figure 2 , Figure 3 and Figure 4 When the oscillating float 1 moves upward, the control method is as follows:

[0061] S1. The controller analyzes and compares the wave height and the direction of motion of the oscillating float 1.

[0062] If the wave height is greater than the upper limit of wave height, proceed to step S2;

[0063] If the wave height is less than the lower limit of wave height, proceed to step S3;

[0064] When the wave height is within the specified range, proceed to step S4;

[0065] S2, the upper chamber 312 of the pneumatic cylinder 3 is connected to the air storage tank 5, and the lower chamber 313 is connected to the external environment. The oscillating float 1 outputs power to the wave energy conversion device 2 and the pneumatic cylinder 3. The gas in the upper chamber 312 of the pneumatic cylinder 3 is compressed into the air storage tank 5.

[0066] S3, the lower chamber 313 of the pneumatic cylinder 3 is connected to the air storage tank 5, and the upper chamber 312 is connected to the external environment. The gas in the air storage tank 5 exerts an upward force on the piston assembly 31. The piston assembly 31 and the oscillating float 1 jointly output power to the wave energy conversion device 2.

[0067] S4. The upper cavity 312 and lower cavity 313 of the pneumatic cylinder 3 are both connected to the external environment, while the air storage tank 5 is in a non-conductive state.

[0068] S5. Repeat the above steps in the next wave.

[0069] In practical use, when the wave height is greater than the upper limit and the piston moves upward, the upper chamber of the pneumatic cylinder is connected to the air tank, which inflates and acts as a buffer. When the wave height is less than the lower limit and the piston moves upward, the lower chamber of the pneumatic cylinder is connected to the air tank, which deflates and assists the movement of the oscillating float. When the wave height is within a suitable range, the pneumatic cylinder is connected to the outside world regardless of whether the piston moves upward or downward, while the air tank is not connected. This process ensures the power generation function under normal conditions and also realizes the functions of inflation and buffering when the wave height exceeds the upper limit and auxiliary power generation when the wave height is less than the lower limit.

[0070] Reference Figure 2 , Figure 3 and Figure 4 When the oscillating float 1 moves downward, the control method is as follows:

[0071] S11. The controller analyzes and compares the wave height and the direction of motion of the oscillating float 1.

[0072] When the wave height is greater than the lower limit of wave height, proceed to step S12;

[0073] When the wave height is less than the lower limit of wave height, proceed to step S13;

[0074] When the wave height is within the specified range, proceed to step S14;

[0075] S12, the lower chamber 313 of the pneumatic cylinder 3 is connected to the air storage tank 5, and the upper chamber 312 is connected to the external environment. The oscillating float 1 outputs power to the wave energy conversion device 2 and the pneumatic cylinder 3. The gas in the lower chamber 313 of the pneumatic cylinder 3 is compressed into the air storage tank 5.

[0076] S13, the upper chamber 312 of the pneumatic cylinder 3 is connected to the air storage tank 5, and the lower chamber 313 is connected to the external environment. The gas in the air storage tank 5 exerts a downward force on the piston assembly 31. The piston assembly 31 and the oscillating float 1 jointly output power to the wave energy conversion device 2.

[0077] S14. The upper cavity 312 and lower cavity 313 of the pneumatic cylinder 3 are both connected to the external environment, while the air storage tank 5 is in a non-conductive state.

[0078] S15. Repeat the above steps in the next wave.

[0079] In practical use, when the wave height is greater than the upper limit and the piston moves downward, the lower chamber of the pneumatic cylinder is connected to the air tank, which inflates and acts as a buffer. When the wave height is less than the lower limit and the piston moves downward, the upper chamber of the pneumatic cylinder is connected to the air tank, which deflates and assists the movement of the oscillating float. When the wave height is within a suitable range, the pneumatic cylinder is connected to the outside world regardless of whether the piston moves upward or downward, while the air tank is not connected. This process ensures the power generation function under normal conditions and also realizes the functions of inflation and buffering when the wave height exceeds the upper limit and auxiliary power generation when the wave height is less than the lower limit.

[0080] In addition, in step S2 or S12, when the pressure of the gas tank 5 reaches the upper limit of safety pressure, the gas in the pneumatic cylinder is vented to the external environment; in step S3 or S13, when the pressure of the gas tank 5 reaches the lower limit of safety pressure or the piston 311 passes the middle position of the pneumatic cylinder 3, step S4 or S14 is executed.

[0081] The implementation principle of a pneumatic buffering and energy recovery and reuse mechanism method according to an embodiment of this application is as follows: In actual use, when the wave height is greater than the upper limit and the piston 311 moves upward, the first electromagnetic air exchange valve 41 and the third electromagnetic air exchange valve 43 are energized, and the air tank 5 is filled with air; when the wave height is greater than the upper limit and the piston 311 moves downward, the third electromagnetic air exchange valve 43 is energized, and the air tank 5 is filled with air; when the wave height is less than the lower limit and the piston 311 moves upward, the first electromagnetic air exchange valve 41 and the second electromagnetic air exchange valve 42 are energized, and the air tank 5 is released; when the wave height is less than the lower limit and the piston 311 moves downward, the second electromagnetic air exchange valve 42 is energized, and the air tank 5 is released; when the wave height is within a suitable range, regardless of the piston... When 311 moves upward or downward, the first electromagnetic air exchange valve 41, the second electromagnetic air exchange valve 42, and the third electromagnetic air exchange valve 43 are all de-energized, and the gas storage tank 5 is not conductive. This process ensures the power generation function under normal conditions and realizes the functions of air filling and buffering when the wave exceeds the upper limit and auxiliary power generation when the wave is below the lower limit. In addition, the overflow valve 44 is used to release the gas in the pressure bar to the outside when the pressure of the gas storage tank 5 reaches the upper limit of safety pressure; and when the pressure of the gas storage tank 5 reaches the lower limit of safety pressure, the first electromagnetic air exchange valve 41, the second electromagnetic air exchange valve 42, and the third electromagnetic air exchange valve 43 are all de-energized, which helps to prevent safety accidents caused by excessive or insufficient pressure and helps to improve the safety of this device.

[0082] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pneumatic buffer and energy recovery and reuse mechanism, comprising: An oscillating float (1) is placed on a body of water and floats up and down with the waves; a wave energy conversion device (2) is connected to the oscillating float (1) and is used to convert the mechanical energy of the oscillating float (1) into electrical energy; characterized in that it further includes: Gas storage tank (5), used for storing or releasing gas; The pneumatic cylinder (3) includes a cylinder body and a piston assembly (31). The piston assembly (31) is connected to the oscillating float (1) and moves up and down along the inside of the cylinder body of the pneumatic cylinder (3). The piston assembly (31) divides the inside of the cylinder body into an upper cavity (312) and a lower cavity (313). Gas interaction device (4), the gas interaction device (4) is connected to gas storage tank (5) and pressure cylinder (3), and the gas interaction device (4) is used to connect the upper cavity (312) to gas storage tank (5) or external environment, and to connect the lower cavity (313) to gas storage tank (5) or external environment. A control system for controlling the gas interaction device (4); The wave energy conversion device (2) includes a sliding component (21) and a fixed component (22) that moves relative to the sliding component (21). The fixed component (22) is installed on a sea platform. The upper end of the sliding component (21) is connected to a pneumatic cylinder (3), and the lower end of the sliding component (21) is connected to an oscillating float (1). The control system includes a controller, a wave prediction device for acquiring wave height, a displacement sensor for acquiring the position of piston assembly (31), and a drive circuit. The wave prediction device and the displacement sensor are connected to the input terminal of the controller, the input terminal of the drive circuit is connected to the output terminal of the controller, and the gas interaction device (4) is connected to the output terminal of the drive circuit. The gas interaction device (4) includes a first electromagnetic air exchange valve (41), a second electromagnetic air exchange valve (42), a third electromagnetic air exchange valve (43), an inflation check valve (45), an venting check valve (46), and an overflow valve (44). The first electromagnetic air exchange valve (41), the second electromagnetic air exchange valve (42), and the third electromagnetic air exchange valve (43) are all connected to the output terminal of the drive circuit. The first electromagnetic air exchange valve (41) is configured as a two-position four-way electromagnetic air exchange valve. The first electromagnetic air exchange valve (41) has a first transition air inlet (411), a second transition air inlet (412), a first transition air outlet (413), and a second transition air outlet (414). When the first electromagnetic air exchange valve (41) is not energized, the first transition air inlet (411) is open. The first transition air outlet (413) is connected to the second transition air inlet (412) and the second transition air outlet (414). When the first electromagnetic air exchange valve (41) is energized, the first transition air inlet (411) and the second transition air outlet (414) are connected. The second transition air inlet (412) and the first transition air outlet (413) are connected. The second electromagnetic air exchange valve (42) and the third electromagnetic air exchange valve (43) are both set as two-position three-way electromagnetic air exchange valves. The second electromagnetic air exchange valve (42) has a first air inlet (421), a first air outlet (422) and a second air outlet (423). When the second electromagnetic air exchange valve (42) is not energized, the first air inlet (421) and the second air outlet (423) are connected. When the second electromagnetic air exchange valve (42) is energized, the first air inlet (421) and the first air outlet (422) are connected. The third electromagnetic air exchange valve (43) has a second air inlet (431), a third air outlet (432) and a fourth air outlet (433). When the third electromagnetic air exchange valve (43) is not energized, the second air inlet (431) and the fourth air outlet (433) are connected. When the third electromagnetic air exchange valve (43) is energized, the second air inlet (431) and the third air outlet (432) are connected. The first transition air inlet (411) and the second transition air inlet (412) on the first electromagnetic air exchange valve (41) are respectively connected to the upper cavity (312) and the lower cavity (313) of the pneumatic cylinder (3). The first transition outlet (413) and the second transition outlet (414) of the first electromagnetic air exchange valve (41) are connected to the first inlet (421) of the second electromagnetic air exchange valve (42) and the second inlet (431) of the third electromagnetic valve, respectively. The first outlet (422) of the second electromagnetic air exchange valve (42) is connected to the venting check valve (46), and the second outlet (423) of the second electromagnetic air exchange valve (42) is connected to the outside. The third outlet (432) of the third electromagnetic air exchange valve (43) is connected to the charging check valve (45), and the fourth outlet (433) of the third electromagnetic air exchange valve (43) is connected to the outside. Both the charging check valve (45) and the venting check valve (46) are connected to the air storage tank (5).The overflow valve (44) is connected to the gas storage tank (5) and is arranged in parallel with the filling check valve (45) and the venting check valve (46).

2. A pneumatic buffering and energy recovery and reuse method, characterized in that, When the oscillating float (1) moves upward, the pneumatic buffer and energy recovery and reuse mechanism according to claim 1 includes the following steps: S1. The wave prediction device analyzes and compares wave heights; when the wave height is greater than the upper limit of wave height, step S2 is executed; when the wave height is less than the lower limit of wave height, step S3 is executed; when the wave height is within the specified range, step S4 is executed. S2, the upper cavity (312) of the pneumatic cylinder (3) is connected to the air storage tank (5), the lower cavity (313) is connected to the external environment, the oscillating float (1) outputs power to the wave energy conversion device (2) and the pneumatic cylinder (3), and the gas in the upper cavity (312) of the pneumatic cylinder (3) is compressed into the air storage tank (5); S3. The lower chamber (313) of the pneumatic cylinder (3) is connected to the air storage tank (5), and the upper chamber (312) is connected to the external environment. The gas in the air storage tank (5) applies an upward force to the piston assembly (31). The piston assembly (31) and the oscillating float (1) jointly output power to the wave energy conversion device (2). S4. The upper cavity (312) and lower cavity (313) of the pneumatic cylinder (3) are both connected to the external environment, and the air storage tank (5) is in a non-conductive state. S5. Repeat the above steps in the next wave.

3. The pneumatic buffering and energy recovery and reuse method according to claim 2, characterized in that... When the oscillating float (1) moves downward, the following steps are included: S11. The wave prediction device analyzes and compares the wave height; when the wave height is greater than the upper limit of the wave height, step S12 is executed; when the wave height is less than the lower limit of the wave height, step S13 is executed; when the wave height is within the limited range, step S14 is executed. S12, the lower cavity (313) of the pneumatic cylinder (3) is connected to the air storage tank (5), the upper cavity (312) is connected to the external environment, the oscillating float (1) outputs power to the wave energy conversion device (2) and the pneumatic cylinder (3), and the gas in the lower cavity (313) of the pneumatic cylinder (3) is compressed into the air storage tank (5); S13, the upper cavity (312) of the pneumatic cylinder (3) is connected to the air storage tank (5), and the lower cavity (313) is connected to the external environment. The gas in the air storage tank (5) applies a downward force to the piston assembly (31). The piston assembly (31) and the oscillating float (1) jointly output power to the wave energy conversion device (2). S14. The upper cavity (312) and lower cavity (313) of the pneumatic cylinder (3) are both connected to the external environment, and the air storage tank (5) is in a non-conductive state. S15. Repeat the above steps in the next wave.

4. The pneumatic buffering and energy recovery and reuse method according to claim 3, characterized in that... The wave prediction device collects wave information for a future period of time and transmits it to the controller. At the same time, the displacement sensor collects the position and direction of movement information of the piston (311) and transmits it to the controller.

5. The pneumatic buffering and energy recovery and reuse method according to claim 4, characterized in that... In step S2 or S12, when the pressure of the gas storage tank (5) reaches the upper limit of safety pressure, the gas in the pneumatic cylinder (3) is connected to the external environment.

6. The pneumatic buffering and energy recovery and reuse method according to claim 4, characterized in that... In step S3 or S13, when the pressure of the gas storage tank (5) reaches the lower safety limit pressure or the piston (311) passes the middle position of the pneumatic cylinder (3), step S4 or S14 is executed.

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