Ocean current power generation floating offshore platform and method of operation thereof

Abstract

The application discloses a kind of ocean current power generation floating offshore platforms and its working method, platform includes support assembly, lifting assembly, anti-rolling assembly, ocean current generator set and water supply and drainage assembly, anti-rolling assembly is fixed to the bottom of support assembly, and both constitute triangular frame structure, three conic curve columns at three vertices of support assembly are barbarian waist hollow column body, the bottom of each conic curve column is respectively provided with an ocean current generator set, and the ocean current generator set is connected with anti-rolling assembly, lifting assembly is set in anti-rolling assembly and is connected with three conic curve columns respectively, water supply and drainage assembly is from the inside of one conic curve column, passes through the inside of lifting assembly and extends to the inside of another conic curve column.The special linear structure of the conic curve column used as pontoon has better wind and wave flow resistance than circle and hexagon.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ocean engineering, in particular to a current power generation floating offshore platform and a working method thereof. BACKGROUND

[0002] With the advent of the industrial era, pollution problems have attracted more and more attention, and clean energy has gradually been valued. Wind power, ocean current and other power generation devices are increasingly developed. In order to adapt to different working environments, a large number of clean energy power generation devices have been developed, and ocean current power generation devices are one of them. China has a vast territory and rich marine resources. Compared with the near shore, the development of the open sea needs to be further explored. The offshore platform is mostly a bottom-sitting platform, while the open sea is mostly deep sea, and the bottom-sitting platform requires a large amount of capital investment and has a huge construction difficulty, so it is necessary to consider a floating platform.

[0003] In the past, the research on the platform was relatively single. For example, the structure of the floating platform was studied. The patent "floating offshore platform (CN115151481A)" forms a tensioning effect by designing the mutual cooperation of the peripheral column and the center column, but this patent does not consider the influence of the column shape and the heaving plate on the hydrodynamic performance of the offshore platform. The patent "offshore wind power platform semi-submersible platform and its lower float (CN114776514A)" studies the swing of the floating ball driven by the wave to drive the generator set to generate electricity and the scalable float to control the displacement of the platform. The function of the float in this patent is similar to the function of the lifting float in this patent, which is to control the lifting of the platform. However, the lifting function of this patent is to avoid danger, while the lifting function of this patent can not only avoid danger in special wind and wave conditions, but also control the power generation efficiency of the platform. The patent "a semi-submersible offshore wind turbine device (CN217348169U)" studies a conical curve column structure floating platform, the middle diameter is the largest, and the diameter of the column gradually decreases upwards and downwards. The effect is that the constraint of upward movement can be offset by the buoyancy effect of the deep diving structure. This patent needs to use anchor chains to moor the platform to the seabed, which increases the difficulty of the entire platform in the actual application scenario. However, this patent does not need to be moored by anchor chains, and the platform itself has good stability. There are many related researches on floating offshore platforms, but there are few researches on the shape of the floating column and the comprehensive performance of the generator set. It may be possible to better achieve the optimization of comprehensive performance through the implementation of a performance, which is a problem worth exploring. The sea conditions in the open sea are variable, and the flow velocities of different ocean current layers are also different, which has certain requirements for the wind resistance and turbulence resistance of the floating platform. SUMMARY

[0004] The purpose of the present application is to provide a current power generation floating offshore platform that can resist complex marine environments and effectively generate electricity with tidal energy to ensure stable power generation of the power generation device. And its working method is provided.

[0005] Technical solution: a current power generation floating ocean platform, including support assembly, lifting assembly, anti-rolling assembly, ocean current generator set and water supply and drainage assembly, the anti-rolling assembly is fixed to the bottom of the support assembly, and the two constitute a triangular frame structure, three conic curve columns on the support assembly are located at the three vertices of the triangle, each conic curve column is a hollow column, each conic curve column is provided with an ocean current generator set at the bottom, the ocean current generator set is connected with the anti-rolling assembly, the lifting assembly is arranged in the anti-rolling assembly and connected with the three conic curve columns, the water supply and drainage assembly extends from the inside of one conic curve column through the inside of the lifting assembly to the inside of another conic curve column.

[0006] Further, the ocean current generator set includes a power generation assembly, a fixing assembly and a forward and reverse rotation assembly, the fixing assembly includes a support connecting rod, a support base, an upper end planetary wheel positioning support, a lower end planetary wheel positioning support and a fixing seat, the support connecting rod is connected with the support base perpendicularly to form an L-shaped structure, and the support connecting rod is connected with the anti-rolling assembly, the forward and reverse rotation assembly is arranged at the bottom of the conic curve column, the lower part of the forward and reverse rotation assembly is connected with the support base through the lower end planetary wheel positioning support, the upper part of the forward and reverse rotation assembly is connected with the fixing seat through the upper end planetary wheel positioning support, the fixing seat is connected with the power generation assembly, and the power generation assembly is arranged in the conic curve column and connected with the forward and reverse rotation assembly.

[0007] Further, the forward and reverse rotation assembly includes an impeller, an inner shaft, an upper end outer shaft, a lower end outer shaft, an inner shaft ratchet, an upper outer shaft ratchet, a lower outer shaft ratchet, an upper end impeller sealing bearing, a lower end impeller sealing bearing, an inner outer shaft positioning bearing, a column sealing bearing, a base sealing bearing, an upper planetary wheel set and a lower planetary wheel set, the impeller is connected with the outer periphery of the inner shaft through the inner shaft ratchet, the upper end outer shaft and the lower end outer shaft are arranged on the inner shaft on the opposite sides of the inner shaft ratchet, one end of the upper end outer shaft and the lower end outer shaft is connected with the inner shaft through an inner outer shaft positioning bearing, the other end of the upper end outer shaft and the inner shaft is provided with the upper planetary wheel set, the upper planetary wheel set is connected with the upper end planetary wheel positioning support, the other end of the lower end outer shaft and the inner shaft is provided with the lower planetary wheel set, the lower planetary wheel set is connected with the lower end planetary wheel positioning support, the upper end outer shaft and the impeller are connected through the upper end impeller sealing bearing, and the upper end outer shaft and the impeller are further provided with the upper outer shaft ratchet, the lower end outer shaft and the impeller are connected through the lower end impeller sealing bearing, and the lower end outer shaft and the impeller are further provided with the lower outer shaft ratchet, the support base and the lower end outer shaft are connected through the base sealing bearing, and the conic curve column and the upper end outer shaft are connected through the column sealing bearing.

[0008] The upper planetary gear set and the lower planetary gear set are identical in structure and each comprises a gear ring, planetary gears, a sun gear and planetary gear bearings. The sun gear is coaxially arranged in the gear ring. The outer ring of the sun gear is connected with the inner ring of the gear ring through a plurality of circumferentially spaced planetary gears. Each planetary gear is connected with the upper end planetary gear positioning support or the lower end planetary gear positioning support through a planetary gear bearing. The inner ring of the sun gear is connected with the outer circumferential surface of the inner shaft. The outer ring of the gear ring is connected with the inner circumferential surface of the upper end outer shaft or the lower end outer shaft.

[0009] Further, the water supply and drainage assembly comprises a water supply pump, a drainage pump, an inlet water supply pipe, an outlet water supply pipe, an inlet drainage pipe, an outlet drainage pipe and an air pipe. The water supply pump is installed inside one of the conic curve-shaped columns. One end of the inlet water supply pipe is connected with the water supply pump and the other end leads to the outside of the conic curve-shaped column. One end of the outlet water supply pipe is connected with the water supply pump and the other end leads to the center of the lifting assembly. The drainage pump is installed inside the other conic curve-shaped column. One end of the inlet drainage pipe is connected with the drainage pump and the other end leads to the center of the lifting assembly. One end of the outlet drainage pipe is connected with the drainage pump and the other end leads to the outside of the corresponding conic curve-shaped column. The air pipe penetrates through one of the conic curve-shaped columns and the inside of the lifting assembly. One end of the air pipe leads to the outside of the corresponding conic curve-shaped column and the other end leads to the center of the lifting assembly.

[0010] The water supply pump is used to pump seawater into the lifting crossbars and the lifting floating balls. The drainage pump is used to pump seawater out of the lifting crossbars and the lifting floating balls.

[0011] Further, the lifting assembly comprises lifting crossbars and lifting floating balls. The inside of each lifting crossbar is provided with a through cavity. The lower part of each conic curve-shaped column is provided with one lifting crossbar. One end of each lifting crossbar is connected with the inner side surface of the bottom of the corresponding conic curve-shaped column and the other end is connected with the outer circumferential surface of the corresponding lifting floating ball, so that the lifting floating ball is located in the center of the three lifting crossbars. The outlet water supply pipe, the inlet drainage pipe and the air pipe penetrate through the inside of the corresponding lifting crossbar to the inside of the lifting floating ball.

[0012] The inside of the conic curve-shaped column is an independent sealed cabin. The lifting crossbars and the lifting floating balls are hollow bodies and are in communication with each other. The lifting crossbars and the bottom ends of the conic curve-shaped columns are not in communication.

[0013] Optimally, the height of the conic curve-shaped column is 3-3.5 times the outer diameter of the lifting floating ball.

[0014] Further, the anti-rolling assembly comprises a rolling plate, a rib plate and a reinforcing rib, the bottoms of two adjacent conical curve-shaped columns are connected by a rolling plate respectively, each rolling plate is fixed with a rib plate respectively, the two ends of each rib plate are fixed with the side faces of the corresponding two conical curve-shaped columns respectively, and the reinforcing rib is arranged between the rolling plate and the rib plate.

[0015] Further, the support assembly further comprises a crossbar, the upper parts of two adjacent conical curve-shaped columns are connected by a crossbar respectively, and the connecting lines of the three crossbars form an equilateral triangle structure.

[0016] During work, the three conical curve-shaped columns are semi-submerged in seawater, the three crossbars are located above the sea level, and the rolling plate, the rib plate, the reinforcing rib, the lifting crossbar, the lifting floating ball and the ocean current generator set are located below the sea level.

[0017] A working method of the ocean current power generation floating offshore platform, comprising the following steps:

[0018] Step one: towing operation;

[0019] The dock gate is opened to put into seawater, the ocean current power generation floating offshore platform is floated under the action of its own buoyancy, the whole platform is towed out of the dock and to the designated sea area by a tugboat, and during the towing process, the water surface line is higher than the plane where the minimum diameter of the conical curve-shaped column is located;

[0020] Step two: mooring operation;

[0021] The ocean current power generation floating offshore platform is sunk to the designed draft, and then the whole device is moored to the seabed by a mooring device, and the connecting point of the mooring device on the platform is located on the outer side of the bottoms of the three conical curve-shaped columns;

[0022] Step three: starting the platform;

[0023] Step four: controlling the platform to rise and fall, so that the ocean current generator set reaches the highest flow speed layer;

[0024] Step five: when the flow speed reaches the set threshold value, the platform starts to work.

[0025] Beneficial effects: compared with the prior art, the advantages of the present application are:

[0026] 1. The conical curve-shaped column is adopted as the float in the present application, and the special linear structure has better wind and wave flow resistance than the circular and hexagonal structures.

[0027] 2. The lifting crossbar and the lifting floating ball are designed at the bottom of the platform, the hollow structure design can pump in or pump out seawater to realize the lifting of the platform according to the actual situation, so that the impeller of the ocean current generator set stays in the flow layer with faster ocean current speed as much as possible, and the efficiency of the platform power generation is ensured.

[0028] 3. The ocean current generator set is provided with two inner and outer shafts in the impeller power transmission part, so that the shaft output can be turned to the same direction no matter the impeller is rotated forward or reversely, and the stability of the ocean current generator set is improved.

[0029] 4. The anti-heeling assembly has a certain anti-heeling ability, and the rib plate and the reinforcing rib structure on the anti-heeling plate strengthen the rigidity of the anti-heeling plate. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic view of the three-dimensional structure of the present application;

[0031] Figure 2 is a front view of the structure of the present application;

[0032] Figure 3 is a schematic view of the three-dimensional structure of the ocean current generator set;

[0033] Figure 4 is a front view of the ocean current generator set;

[0034] Figure 5 is a front view of the ocean current generator set; Figure 4 is an enlarged view of A in the front view;

[0035] Figure 6 is an enlarged view of B in the front view; Figure 4

[0036] Figure 7 is a schematic view of the three-dimensional structure of the present application when pumping seawater;

[0037] Figure 8 is a schematic view of the three-dimensional structure of the present application when pumping seawater;

[0038] Figure 9 is a comparison diagram of the conic curve shape, circular shape and hexagonal shape of the column of the present application;

[0039] Figure 10 is a roll excitation moment diagram of the conic curve shape, circular shape and hexagonal shape of the column;

[0040] Figure 11 is a heave excitation force diagram of the conic curve shape, circular shape and hexagonal shape of the column. DETAILED DESCRIPTION

[0041] The present application will be further illustrated below in combination with the drawings and specific embodiments, and it should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application.

[0042] An ocean current power generation floating offshore platform, as shown in Figures 1-11 , comprises a support assembly, a lifting assembly, an anti-heeling assembly, an ocean current generator set 4 and a water supply and drainage assembly.​

[0043] The anti-rolling assembly is fixed to the bottom of the support assembly, and the two constitute a triangular frame structure. The three conic curve-shaped columns 11 at the three vertices of the triangle are hollow columns with a horse's jaw shape. The lifting assembly is arranged in the anti-rolling assembly and is connected with the three conic curve-shaped columns 11 respectively.

[0044] As shown in Figure 1 , the support assembly includes three conic curve-shaped columns 11 and three crossbars 12. The lifting assembly includes three lifting crossbars 21 and one lifting floating ball 22. The anti-rolling assembly includes three anti-rolling plates 31, three rib plates 32, and twelve reinforcing ribs 33. The three crossbars 12 are connected with the three conic curve-shaped columns 11 respectively. The three conic curve-shaped columns 11 are distributed in an equilateral triangle. The bottom ends of the conic curve-shaped columns 11 are connected with the three anti-rolling plates 31 respectively. The rib plates 32 and the reinforcing ribs 33 are fixed on the anti-rolling plates 31. The lifting crossbars 21 are connected with the bottom ends of the conic curve-shaped columns 11 at the front ends and are connected with the lifting floating ball 22 at the tail ends. The three anti-rolling plates 31 are fixed with the rib plates 32 respectively. The rib plates 32 are connected with the anti-rolling plates 31 perpendicularly. Two reinforcing ribs 33 are fixed on the two sides of each rib plate 32 connected with the anti-rolling plate 31. The reinforcing ribs 33 separate the rib plate 32 and the anti-rolling plate 31 into three segments with equal lengths.

[0045] The bottom of each conic curve-shaped column 11 is provided with an ocean current generator set. The ocean current generator set is connected with the anti-rolling assembly. The water supply and drainage assembly passes through the inside of the lifting assembly from the inside of one conic curve-shaped column 11 to the inside of another conic curve-shaped column 11.

[0046] The ocean current generator set 4 includes a power generation assembly 41, a fixing assembly, and a forward and reverse rotation assembly. The fixing assembly includes a support connecting rod 421, a support base 422, an upper end planetary gear positioning support 423, a lower end planetary gear positioning support 424, and a fixing seat 425. The forward and reverse rotation assembly further includes an impeller 431, an inner shaft 432, an upper end outer shaft 433, a lower end outer shaft 434, an inner shaft ratchet 435, an upper outer shaft ratchet 436, a lower outer shaft ratchet 437, an impeller upper end sealing bearing 438, an impeller lower end sealing bearing 439, an inner and outer shaft positioning bearing 440, a column sealing bearing 441, a base sealing bearing 442, an upper planetary gear set 443, and a lower planetary gear set 444. The upper planetary gear set 443 and the lower planetary gear set 444 are the same in structure and each include a gear ring 451, a planetary gear 452, a sun gear 453, and a planetary gear bearing 454.

[0047] As shown in Figure 2As shown, the power generation assembly 41 of the ocean current generator set 4 is fixed inside the conic curve-shaped stand 11, and the impeller 431 and its assembly of the ocean current generator set 4 are connected with the power generation assembly 41 and placed in seawater.

[0048] The support connecting rod 421 is connected with the support base 422 perpendicularly to form an L-shaped structure, the support connecting rod 421 is connected with the anti-rolling assembly, the forward and reverse rotation assembly is arranged at the bottom of the conic curve-shaped stand 11, the lower part of the forward and reverse rotation assembly is connected with the support base 422 through the lower end planetary gear positioning bracket 424, and the upper part of the forward and reverse rotation assembly is connected with the fixed seat 425 through the upper end planetary gear positioning bracket 423, the fixed seat 425 is connected with the power generation assembly 41, and the power generation assembly 41 is installed inside the conic curve-shaped stand 11 and connected with the forward and reverse rotation assembly.

[0049] The impeller 431 is connected with the outer periphery of the inner shaft 432 through the inner shaft ratchet wheel 435, the upper end outer shaft 433 and the lower end outer shaft 434 are respectively sleeved on the inner shaft 432 on the opposite sides of the inner shaft ratchet wheel 435, one end of the upper end outer shaft 433 and the lower end outer shaft 434 is respectively connected with the inner shaft 432 through an inner-outer shaft positioning bearing 440, the other end of the upper end outer shaft 433 and the inner shaft 432 is provided with the upper planetary gear set 443, the upper planetary gear set 443 is connected with the upper end planetary gear positioning bracket 423, the other end of the lower end outer shaft 434 and the inner shaft 432 is provided with the lower planetary gear set 444, the lower planetary gear set 444 is connected with the lower end planetary gear positioning bracket 424, the upper end outer shaft 433 and the impeller 431 are connected through the impeller upper end sealing bearing 438, and the upper end outer shaft 433 and the impeller 431 are further provided with the upper outer shaft ratchet wheel 436, the lower end outer shaft 434 and the impeller 431 are connected through the impeller lower end sealing bearing 439, and the lower end outer shaft 434 and the impeller 431 are further provided with the lower outer shaft ratchet wheel 437, the support base 422 and the lower end outer shaft 434 are connected through the base sealing bearing 442, and the conic curve-shaped stand 11 and the upper end outer shaft 433 are connected through the stand sealing bearing 441.

[0050] As shown in Figure 5 , 6 The upper planetary gear set 443 and the lower planetary gear set 444 are the same in structure and each include a gear ring 451, a planetary gear 452, a sun gear 453 and a planetary gear bearing 454, the sun gear 453 is coaxially arranged in the gear ring 451, the outer ring of the sun gear 453 is connected with the inner ring of the gear ring 451 through a plurality of planetary gears 452 which are arranged in a circumferential interval, each planetary gear 452 is connected with the upper end planetary gear positioning bracket 423 or the lower end planetary gear positioning bracket 424 through a planetary gear bearing 454, the inner ring of the sun gear 453 is connected with the outer periphery of the inner shaft 432, and the outer ring of the gear ring 451 is connected with the inner periphery of the upper end outer shaft 433 or the lower end outer shaft 434. The number of the planetary gears 452 of the upper planetary gear set 443 and the lower planetary gear set 444 can be three.

[0051] AsFigure 7 The platform cross-sectional view of the application, the inside of the conic curve column 11 is an independent sealed cabin, the lifting crossbar 21 and the lifting floating ball 22 are hollow bodies and are connected with each other, and the lifting crossbar 21 is not connected with the bottom end of the conic curve column 11.

[0052] The height of the conic curve column 11 is about 3-3.5 times of the outer diameter of the lifting floating ball 22. The whole structure is distributed in an equilateral triangle, and each bottom end of the three conic curve columns 11 is provided with an ocean current generator set 4. The lifting floating ball 22, the lifting crossbar 21 and the ocean current generator set 4 are located at the bottom of the platform.

[0053] The water supply and drainage assembly comprises a water supply pump 51, a drainage pump 52, an inlet water supply pipe 53, an outlet water supply pipe 54, an inlet drainage pipe 55, an outlet drainage pipe 56 and an air pipe 57. The water supply pump 51 is installed in the inside of one of the conic curve columns 11. One end of the inlet water supply pipe 53 is connected with the water supply pump 51, and the other end is connected with the outside of the conic curve column 11. One end of the outlet water supply pipe 54 is connected with the water supply pump 51, and the other end is connected with the center of the lifting assembly. The drainage pump 52 is installed in the inside of another conic curve column 11. One end of the inlet drainage pipe 55 is connected with the drainage pump 52, and the other end is connected with the center of the lifting assembly. One end of the outlet drainage pipe 56 is connected with the drainage pump 52, and the other end is connected with the outside of the corresponding conic curve column 11. The air pipe 57 penetrates through one of the conic curve columns 11 and the inside of the lifting assembly. One end of the air pipe 57 is connected with the outside of the corresponding conic curve column 11, and the other end is connected with the center of the lifting assembly.

[0054] The main body fixing assembly of the ocean current power generation floating ocean platform of the application is distributed according to the equilateral triangle rule. As shown in the figure, the influence of the shape of the column on the performance is studied before the platform structure is designed, the conic curve column (a), the circular column (b) and the hexagonal column (c) are selected for comparative analysis, and finally the conic curve column (a) is selected as the reference for the platform design. Figure 9 As shown in the figures, the roll excitation moment and the heave excitation force of the conic curve column, the circular column and the hexagonal column are compared and analyzed by controlling the height, diameter and other variables in the AQWA software. According to the software calculation data, the roll excitation moment of the conic curve column is smaller than that of the circular column and the hexagonal column, and the heave excitation force of the conic curve column is also smaller than that of the circular column and the hexagonal column, which indicates that the wind resistance of the part above the sea level of the conic curve column is smaller than that of the circular column and the hexagonal column, and the wave and current resistance of the part below the sea level of the conic curve column is also smaller than that of the circular column and the hexagonal column, that is, the ability of the conic curve column to resist wind, wave and current is superior to that of the circular column and the hexagonal column. Figure 10 Figure 11 As shown in the figures, the roll excitation moment and the heave excitation force of the conic curve column, the circular column and the hexagonal column are compared and analyzed by controlling the height, diameter and other variables in the AQWA software. According to the software calculation data, the roll excitation moment of the conic curve column is smaller than that of the circular column and the hexagonal column, and the heave excitation force of the conic curve column is also smaller than that of the circular column and the hexagonal column, which indicates that the wind resistance of the part above the sea level of the conic curve column is smaller than that of the circular column and the hexagonal column, and the wave and current resistance of the part below the sea level of the conic curve column is also smaller than that of the circular column and the hexagonal column, that is, the ability of the conic curve column to resist wind, wave and current is superior to that of the circular column and the hexagonal column.

[0055] ​The application discloses a working method of a current power generation floating offshore platform.

[0056] Step one: towing operation

[0057] After the whole device is completed, the dock gate is opened to put into seawater, the current power generation floating offshore platform is floated under the action of self buoyancy, the whole device is towed out of the dock and towed to a designated sea area by a tugboat. During the towing process, the water surface line should be lower than the lower end of the cross rod 12 and higher than the plane where the minimum diameter of the conical curve-shaped column 11 is located, so that the towing resistance is small, and the completion of the towing work is facilitated.

[0058] Step two: mooring operation

[0059] The current power generation floating offshore platform is sunk to the designed draft, and then the whole device is moored on the seabed by a mooring device, and the connecting point of the mooring device on the platform is located at the outer side of the bottom of the three conical curve-shaped columns 11. Since the installation work is completed in the dock in advance, a large amount of time for offshore operation is saved, and the danger of work is reduced.

[0060] Step three: starting the platform

[0061] Step four: controlling the platform to sink and make the impeller reach the highest flow speed layer

[0062] The platform is provided with a lifting control system, ten flow speed sensors A1, A2, A3, …, A 10 Each flow speed sensor can detect the flow speed of a corresponding flow layer, and the distances between the flow speed sensors A1, A2, A 3, …, A 10 and the impeller 431 are recorded as S1, S2, S3, …, S 10 respectively, and the values are input into a computer, wherein the value of S6 is 0, that is, the flow speed sensor A6 is in the same flow layer as the impeller 431.

[0063] 4.1 When the flow speed below the impeller 431 is fast, the sensor feeds back the data information to the computer, the computer judges the sinking distance S n of the platform, and the control system controls the water pump 51 to work at this moment, the water pump 51 pumps seawater outside the platform into the lifting floating ball 22 and the lifting cross rod 21 from the inlet water pipe 53 and the outlet water pipe 54, and as the water level in the lifting floating ball 22 and the lifting cross rod 23 gradually increases, the platform gradually sinks, and when the platform sinks to the distance S nWhen the flow velocity sensor A6 in the same flow layer as the impeller 431 senses that the fastest flow layer has been reached and feeds back the data information to the computer, the control system of the computer controls the water pump 51 to stop working. The air pipe 57 is used to connect the outside air to the lifting float ball 22 and the lifting horizontal rod 21, so that the lifting float ball 22 and the lifting horizontal rod 21 do not form a vacuum environment during the whole process.

[0064] 4.2 When the flow velocity above the impeller 431 is fast, the sensor feeds back the data information to the computer, and the computer judges the distance S that the platform needs to sink n At this time, the control system controls the water pump 52 to work, and the water pump 52 pumps the seawater in the lifting float ball 22 and the lifting horizontal rod 21 from the inlet drain pipe 55 into and out of the outlet drain pipe 56 to the outside of the platform. As the water level in the lifting float ball 22 and the lifting horizontal rod 21 gradually decreases, the platform gradually floats up. When the platform floats up to the distance S n that the computer predicts, the flow velocity sensor A6 in the same flow layer as the impeller 431 senses that the fastest flow layer has been reached and feeds back the data information to the computer, and the control system of the computer controls the water pump 52 to stop working.

[0065] Step five: when the flow velocity reaches the threshold value x m / s, the platform starts to work;

[0066] 5.1 When the impeller 431 rotates clockwise, the inner shaft ratchet 435 drives the inner shaft 432 to be tensioned, and the inner shaft 432 rotates clockwise at the same time. At this time, the clockwise rotation of the inner shaft 432 drives the upper end outer shaft 433 and the lower end outer shaft 434 to rotate counterclockwise through the upper planetary gear set 443 and the lower planetary gear set 444, and the counterclockwise rotation of the upper end outer shaft 433 and the lower end outer shaft 434 drives the upper outer shaft ratchet 436 and the lower outer shaft ratchet 437 to idle, so as not to be tensioned and not to conflict with the rotation of the inner shaft ratchet 435;

[0067] 5.2 When the impeller 431 rotates counterclockwise, the upper outer shaft ratchet 436 and the lower outer shaft ratchet 437 drive the upper end outer shaft 433 and the lower end outer shaft 434 to be tensioned at the same time, and the upper end outer shaft 433 and the lower end outer shaft 434 rotate counterclockwise at the same time. At this time, the counterclockwise rotation of the upper end outer shaft 433 and the lower end outer shaft 434 drives the inner shaft 432 to rotate clockwise through the upper planetary gear set 443 and the lower planetary gear set 444, and the clockwise rotation of the inner shaft 432 drives the inner shaft ratchet 435 to idle, so as not to be tensioned and not to conflict with the rotation of the upper outer shaft ratchet 436 and the lower outer shaft ratchet 437. Finally, no matter whether the impeller 431 rotates clockwise or counterclockwise, it will drive the inner shaft 432 to rotate clockwise, so as to transmit the power of the ocean current to the power generation assembly 41 in the same direction.

Claims

1. A floating offshore platform for ocean current power generation, characterized in that: It includes a support assembly, a lifting assembly, an anti-sag assembly, an ocean current generator set (4), and a water supply and drainage assembly. The anti-sag assembly is fixed to the bottom of the support assembly, and the two form a triangular frame structure. The three conical columns (11) located at the three vertices of the triangle on the support assembly are hollow columns with a waist shape. Each conical column (11) has an ocean current generator set (4) at its bottom. The ocean current generator set (4) is connected to the anti-sag assembly. The lifting assembly is set in the anti-sag assembly and is connected to the three conical columns (11) respectively. The water supply and drainage assembly extends from the inside of one of the conical columns (11), through the inside of the lifting assembly, and into the inside of another conical column (11). The ocean current generator set (4) includes a power generation component (41), a fixed component, and a forward and reverse rotation component. The fixed component includes a support link (421), a support base (422), an upper planetary gear positioning bracket (423), a lower planetary gear positioning bracket (424), and a fixed seat (425). The support link (421) is vertically connected to the support base (422) to form an L-shaped structure. The support link (421) is connected to the anti-sag component. The forward and reverse rotation component is installed at the bottom of the conical column (11). Its lower part is connected to the support base (422) through the lower planetary gear positioning bracket (424), and its upper part is connected to the fixed seat (425) through the upper planetary gear positioning bracket (423). The fixed seat (425) is connected to the power generation component (41). The power generation component (41) is installed inside the conical column (11) and connected to the forward and reverse rotation component. The forward and reverse rotation assembly includes an impeller (431), an inner shaft (432), an upper outer shaft (433), a lower outer shaft (434), an inner shaft ratchet (435), an upper outer shaft ratchet (436), a lower outer shaft ratchet (437), an upper impeller sealing bearing (438), a lower impeller sealing bearing (439), inner and outer shaft positioning bearings (440), a column sealing bearing (441), a base sealing bearing (442), an upper planetary gear set (443), and a lower... The planetary gear set (444) has an impeller (431) connected to the outer circumference of the inner shaft (432) via an inner shaft ratchet (435). An upper outer shaft (433) and a lower outer shaft (434) are respectively fitted onto the inner shaft (432) on opposite sides of the inner shaft ratchet (435). One end of the upper outer shaft (433) and the lower outer shaft (434) are respectively connected to the inner shaft (432) via an inner and outer shaft positioning bearing (440). The upper outer shaft (433)... An upper planetary gear set (443) is provided between the other end and the inner shaft (432), and the upper planetary gear set (443) is connected to the upper planetary gear positioning bracket (423). A lower planetary gear set (444) is provided between the other end of the lower outer shaft (434) and the inner shaft (432), and the lower planetary gear set (444) is connected to the lower planetary gear positioning bracket (424). The upper outer shaft (433) and the impeller (431) are connected by a sealing bearing (438) at the upper end of the impeller. The two are connected by an upper outer shaft ratchet (436), and the lower outer shaft (434) is connected to the impeller (431) through the impeller lower end sealing bearing (439). The two are also connected by a lower outer shaft ratchet (437). The support base (422) is connected to the lower outer shaft (434) through the base sealing bearing (442). The conical column (11) is connected to the upper outer shaft (433) through the column sealing bearing (441).

2. The floating offshore platform for ocean current power generation according to claim 1, characterized in that: The upper planetary gear set (443) and the lower planetary gear set (444) have the same structure, both including a gear ring (451), planetary gears (452), a sun gear (453) and a planetary gear bearing (454). The sun gear (453) is coaxially arranged inside the gear ring (451). The outer ring of the sun gear (453) is connected to the inner ring of the gear ring (451) through multiple planetary gears (452) arranged circumferentially. Each planetary gear (452) is connected to the upper planetary gear positioning bracket (423) or the lower planetary gear positioning bracket (424) through a planetary gear bearing (454). The inner ring of the sun gear (453) is connected to the outer circumferential surface of the inner shaft (432), and the outer ring of the gear ring (451) is connected to the inner circumferential surface of the upper outer shaft (433) or the lower outer shaft (434).

3. The floating offshore platform for ocean current power generation according to claim 1, characterized in that: The water supply and drainage assembly includes a water supply pump (51), a drainage pump (52), an inlet water supply pipe (53), an outlet water supply pipe (54), an inlet drainage pipe (55), an outlet drainage pipe (56), and a vent pipe (57). The water supply pump (51) is installed inside one of the conical columns (11). One end of the inlet water supply pipe (53) is connected to the water supply pump (51), and the other end leads to the outside of the conical column (11). One end of the outlet water supply pipe (54) is connected to the water supply pump (51), and the other end leads to the center of the lifting assembly. The drainage pump... (52) Installed inside another conical column (11), one end of the inlet drain pipe (55) is connected to the drain pump (52), and the other end leads to the center of the lifting assembly. One end of the outlet drain pipe (56) is connected to the drain pump (52), and the other end leads to the outside of the corresponding conical column (11). The vent pipe (57) passes through one of the conical columns (11) and the inside of the lifting assembly. One end of the vent pipe (57) leads to the outside of the corresponding conical column (11), and the other end leads to the center of the lifting assembly.

4. The floating offshore platform for ocean current power generation according to claim 3, characterized in that: The lifting assembly includes a lifting crossbar (21) and a lifting float (22). The lifting crossbar (21) has a cavity inside. Each conical column (11) has a lifting crossbar (21) at its lower part. One end of the lifting crossbar (21) is connected to the inner side of the bottom of the corresponding conical column (11), and the other end is connected to the outer circumference of the lifting float (22), so that the lifting float (22) is located in the center of the three lifting crossbars (21). The outlet water supply pipe (54), the inlet drain pipe (55), and the vent pipe (57) pass through the interior of the corresponding lifting crossbar (21) and lead to the interior of the lifting float (22) at one end.

5. A floating offshore platform for ocean current power generation according to claim 4, characterized in that: The height of the conical column (11) is 3 to 3.5 times the outer diameter of the lifting float (22).

6. The ocean current power generation floating offshore platform according to claim 1, characterized in that: The anti-sag assembly includes a sag plate (31), a rib plate (32), and a reinforcing rib (33). The bottoms of two adjacent conical columns (11) are connected by a sag plate (31). A rib plate (32) is fixed on each sag plate (31). The two ends of each rib plate (32) are fixed to the sides of the corresponding two conical columns (11). A reinforcing rib (33) is also provided between the sag plate (31) and the rib plate (32).

7. The floating offshore platform for ocean current power generation according to claim 1, characterized in that: The support assembly also includes a crossbar (12), and the upper parts of two adjacent conical columns (11) are connected by a crossbar (12). The first line connecting the three crossbars (12) forms an equilateral triangle structure.

8. A method for operating a floating offshore platform for ocean current power generation as described in any one of claims 1 to 7, characterized in that... Includes the following steps: Step 1: Towing operation; Open the dock gate and let in seawater. The ocean current power generation floating marine platform floats up under its own buoyancy. Use a tugboat to tow the entire platform out of the dock and tow it to the designated sea area. During the towing process, make the water level line higher than the plane where the diameter of the conic column (11) is the smallest. Step Two: Mooring Operations; The ocean current power generation floating offshore platform is lowered to its design draft, and then the entire device is moored to the seabed using a mooring device. The connection point of the mooring device on the platform is located on the outer side of the bottom of three conical columns (11). Step 3: Start the platform; Step 4: Control the platform to raise and lower, so that the ocean current generator unit reaches the highest current velocity layer; Step 5: When the flow rate reaches the set threshold, the platform starts working.

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