Tidal current energy and buoyancy energy combined power generation equipment and working method thereof

Abstract

The invention discloses tidal current energy and buoyancy energy combined power generation equipment and a working method thereof.The tidal current energy and buoyancy energy combined power generation equipment comprises a water turbine, a power generator, a rotating transmission assembly and a control mechanism, the water turbine comprises a rack and a blade mechanism, the blade mechanism comprises a plurality of blade sets and a plurality of sets of driving parts, and the driving parts are arranged on the rack; the control mechanism comprises a controller and a position measuring component, the position measuring component comprises a flood tide position measuring assembly and an ebb tide position measuring assembly, the flood tide position measuring assembly comprises a plurality of forward rotation position measuring pieces and a forward rotation position measuring indicating piece, and the ebb tide position measuring assembly comprises a plurality of reverse rotation position measuring pieces and a reverse rotation position measuring indicating piece. Based on utilization of tidal current energy, buoyancy is utilized to enable the blade sets in the negative energy state to obtain kinetic energy again so as to promote the water turbine to rotate, combined power generation of the tidal current energy and the buoyancy energy is achieved, compared with only utilization of the tidal current energy, consumption of the tidal current energy is reduced, and the power generation efficiency is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation devices, and particularly to a device for combined power generation of tidal energy and buoyancy energy and its working method. Background Art

[0002] With the improvement of people's living standards and the development of technology, the demand for energy by people has also increased accordingly. At the present stage, the consumption of non-renewable resources such as oil and coal has led to an increasingly serious problem of energy depletion, and humans have begun to use renewable energy such as wind energy and solar energy to generate electricity. Since wind energy and solar energy power generation have many requirements for wind speed, site, and sunlight, the conversion rate is low and unpredictable, and the converted electricity accounts for a low share of the total power generation. To further optimize the energy structure, it is of great significance to develop ocean tidal energy. A tidal energy turbine is a device that utilizes tidal energy. It first converts tidal energy into the kinetic energy of the turbine, and then outputs mechanical energy to the generator through a transmission device, and the generator converts the mechanical energy into electrical energy.

[0003] When designing some tidal energy turbines, their rotating shafts are parallel to the tidal current direction, and the tidal current is used to drive the impeller propeller to rotate to output mechanical energy and drive the generator to generate electricity. This horizontal-axis tidal energy turbine has tidal energy utilization value only in waters with a sea depth of more than 40 meters. Since the average ocean depth in the coastal areas of our country does not exceed 20 meters, more than 90% of the waters cannot meet the use requirements.

[0004] In addition, along with the ebb and flow of the tide, the direction of the tidal current will change. Since most horizontal-axis tidal energy turbines use one-way blades, they can only generate electricity using the ebb or flow of the tide, and the power generation efficiency is extremely low. In order to make full use of the energy generated by the ebb and flow of the tide, prior art personnel usually choose to install two sets of power generation systems. One set of power generation system has the impeller facing the flood direction, and the other set of power generation system has the impeller facing the ebb direction. Although it seems that the energy generated by the ebb and flow of the tide is fully utilized, during the ebb or flow of the tide, there will always be a set of power generation system idle, and adding a set of power generation system doubles the production cost, while the increase in the generated electric power is far less than the increase in cost, which greatly limits the popularization and application of this device.

[0005] When designing some other tidal energy turbines, their rotating shafts are transverse to the tidal current direction to utilize the tidal current to drive the blades to rotate to output mechanical energy and drive the generator to generate electricity. When this horizontal-axis tidal energy turbine is in use, there is a situation where the blades are vertically facing the seabed. At this time, the actual rotation direction of the corresponding blades is opposite to the pushing rotation direction of the tidal current acting on the corresponding blades, so that the corresponding blades are in a negative energy state. The tidal current needs to impact other blades to drive the corresponding blades to rotate. During this process, part of the tidal energy is consumed, resulting in a decrease in the mechanical energy output by the turbine, and thus a decrease in the power generation efficiency. Summary of the Invention

[0006] One advantage of the present invention is that it provides a device for generating electricity by combining tidal energy and buoyancy energy and a working method thereof. The present invention is based on the utilization of tidal energy and utilizes buoyancy to enable a blade group in a negative energy state to regain kinetic energy to promote the rotation of the turbine, thereby realizing the combined power generation of tidal energy and buoyancy energy. Compared with the utilization of tidal energy alone, the consumption of tidal energy is reduced, so that the power generation efficiency is guaranteed.

[0007] One advantage of the present invention is that it provides a device for generating electricity by combining tidal energy and buoyancy energy and a working method thereof. The present invention can generate electricity in a forward direction during high tide and in a reverse direction during low tide, thereby effectively improving the power generation efficiency.

[0008] One advantage of the present invention is that it provides a device for generating electricity by combining tidal energy and buoyancy energy and a working method thereof. The present invention can convert buoyancy energy into mechanical energy and finally into electrical energy, thus overcoming the defect that electricity cannot be generated during low tide, achieving 24-hour uninterrupted power generation with higher power generation efficiency.

[0009] One advantage of the present invention is that it provides a device for generating electricity by combining tidal energy and buoyancy energy and a working method thereof. The present invention controls the buoyancy exerted on the corresponding blade group by compressing or expanding the airbag, and during use, the gas in the compressed airbag is introduced into the expanded inner bag, without the need to introduce an additional air source, and the operation is convenient.

[0010] One advantage of the present invention is that it provides equipment for generating electricity by combining tidal energy and buoyancy energy and a working method thereof. The height of the turbine of the present invention can be adjusted, and the rotation speed of the turbine can be increased or decreased by increasing or decreasing the contact area between the turbine and the tidal flow, so that the rotation speed of the turbine is maintained within a certain range, thereby ensuring the stability of the power generation of the generator connected to the turbine in transmission, and effectively avoiding the situation where the power generation is affected by the unstable speed of the tidal current.

[0011] In order to achieve at least one of the above advantages of the present invention, the present invention provides a device for generating electricity by combining tidal energy and buoyancy energy, the device for generating electricity by combining tidal energy and buoyancy energy comprising:

[0012] A water turbine, comprising:

[0013] A frame, the frame comprising a rotating shaft and two mounting members, the two mounting members are both mounted on the rotating shaft and are spaced apart from each other;

[0014] A blade mechanism, the blade mechanism comprising:

[0015] A plurality of blade groups, the blade groups are installed between the two mounting members, and the plurality of blade groups are distributed at intervals around the circumferential side of the rotating shaft. The rotating shaft of the water turbine is horizontally arranged in the tidal current movement direction and part of the blade groups are submerged in the water. The blade group includes a fixed blade, a movable blade and an airbag. The fixed blade is installed on the mounting member, the fixed blade and the movable blade are arranged oppositely, the airbag is installed between the fixed blade and the movable blade, the movable blade can be driven to approach or move away from the fixed blade to compress or expand the airbag, the airbag has at least one through port, and the airbag is inflated and deflated through the through port to be deflated or inflated when it is compressed or expanded. During the process that the tidal current impacts the blade group at flood tide and drives the frame to rotate through the blade group, the azimuth angle when the end of the blade group away from the rotating shaft faces upward is defined as 0°, the azimuth angle when the blade group rotates away from 0° and keeps horizontal is defined as 90°, the azimuth angle when the blade group rotates in the same direction to rotate away from 90° and the end away from the rotating shaft faces downward is defined as 180°, and the azimuth angle when the blade group rotates in the same direction to rotate away from 180° and keeps horizontal again is defined as 270°. The direction in which the tidal current impacts the blade group at flood tide to make the water turbine rotate is defined as the positive direction, and the direction in which the tidal current impacts the blade group at ebb tide to make the water turbine rotate is defined as the negative direction;

[0016] Multiple groups of displacement driving members, each movable blade is installed at one end of a group of displacement driving members, and the movable blade can be driven by the displacement driving members to approach or move away from the fixed blade to compress or expand the airbag;

[0017] A generator,

[0018] A rotational transmission assembly, the rotational transmission assembly includes a first rotational transmission member and a second rotational transmission member. The first rotational transmission member and the second rotational transmission member are respectively installed on the rotating shaft and the generator. The first rotational transmission member is matched with the second rotational transmission member and can drive the second rotational transmission member to rotate. When the rotating shaft rotates, the rotating shaft drives the generator to operate and generate electricity through the cooperation of the first rotational transmission member and the second rotational transmission member;

[0019] A control mechanism, the control mechanism includes:

[0020] A controller, the displacement driving members are controllably connected to the controller;

[0021] A positioning member, the positioning member includes a rising tide positioning assembly and a ebbing tide positioning assembly. The rising tide positioning assembly includes a plurality of forward rotation positioning members and a forward rotation positioning indicator. The ebbing tide positioning assembly includes a plurality of reverse rotation positioning members and a reverse rotation positioning indicator. The forward rotation positioning members and the reverse rotation positioning members are both communicatively connected to the controller. The number of the forward rotation positioning members and the reverse rotation positioning members provided is the same as the number of the blade groups. Each of the forward rotation positioning members and each of the reverse rotation positioning members are respectively used to detect the position when a corresponding blade group rotates forward and backward. The forward rotation positioning members are arranged on the same side as the forward rotation positioning indicator and can be driven to rotate relative to the forward rotation positioning indicator. The reverse rotation positioning members are arranged on the same side as the reverse rotation positioning indicator and can be driven to rotate relative to the reverse rotation positioning indicator. A forward rotation indication structure is formed on a part of the forward rotation positioning indicator with an azimuth between 180° and 270°. The forward rotation indication structure corresponds to a part of the rotation path of the forward rotation positioning member driven to rotate. The forward rotation positioning member can radiate signals to the forward rotation positioning indicator and receive reflected signals. The controller controls the corresponding displacement member to operate according to the feedback of the forward rotation positioning member to drive the movable blade to approach or move away from the fixed blade. A reverse rotation indication structure is formed on a part of the reverse rotation positioning indicator with an azimuth between 180° and 90°. The reverse rotation indication structure corresponds to a part of the rotation path of the reverse rotation positioning member driven to rotate. The reverse rotation positioning member can radiate signals to the reverse rotation positioning indicator and receive reflected signals. The controller controls the corresponding displacement member to operate according to the feedback of the reverse rotation positioning member to drive the movable blade to approach or move away from the fixed blade.

[0022] According to an embodiment of the present invention, two through ports are provided for each of the air bags. The blade mechanism further includes a communication pipe group. The communication pipe group has a plurality of interfaces. Each through port of each air bag is communicated with an interface through a pipeline. When at least two sets of the displacement members are controlled to operate so that the movable blades of at least two corresponding blade groups move, at least one movable blade approaches the corresponding fixed blade to compress the corresponding air bag, and at least one movable blade moves away from the corresponding fixed blade to expand the corresponding air bag. The gas in the compressed air bag is introduced into the expanded air bag through the communication pipe group.

[0023] According to an embodiment of the present invention, the connecting pipe group includes a plurality of connecting pipes and a plurality of communicating pipes. The plurality of connecting pipes are spaced apart and arranged on the circumferential side of the rotating shaft. At least one of the communicating pipes is arranged between two adjacent connecting pipes and is connected through the communicating pipe. Every two of the interfaces form a pair, and at least one pair of the interfaces are formed on the connecting pipes. Each pair of the interfaces is docked with the two ports of an airbag through pipelines. One of the connecting pipes has an inflation port, and the inflation port can be communicated with an external air source to introduce a predetermined amount of gas into the connecting pipe group.

[0024] According to an embodiment of the present invention, it is characterized in that both the forward rotation positioning member and the reverse rotation positioning member are implemented as ultrasonic sensors, and both the forward rotation indication structure and the reverse rotation indication structure are implemented as arc grooves.

[0025] According to an embodiment of the present invention, the device for generating electricity by combining tidal energy and buoyancy energy further includes two mounting seats. The mounting seats are fixed to the seabed soil layer. The two mounting seats are arranged opposite to each other. The two end portions of the rotating shaft are rotatably mounted on the two mounting seats, and the water turbine is supported by the mounting seats and kept in the water.

[0026] According to an embodiment of the present invention, the mounting seat includes a mounting main body. The mounting main body includes a fixed support leg and a lifting part. The bottom of the fixed support leg is fixedly mounted on the seabed soil layer. The two end portions of the rotating shaft are respectively rotatably mounted on the two lifting parts. The lifting part is vertically liftably connected to the fixed support leg. The lifting support column further includes a plurality of lifting transmission components and a plurality of driving components. The lifting transmission component includes a transmission gear and a transmission rack. The transmission rack extends vertically and meshes with the transmission gear. The transmission gear is mounted on the driving component. The driving component is used to drive the transmission gear to rotate. Either the transmission rack or the transmission gear is mounted on the lifting part and the other is mounted on the fixed support leg. When the transmission gear is driven by the driving component to rotate, the lifting part can vertically move under the cooperation of the transmission gear and the transmission rack to drive the water turbine to lift.

[0027] According to an embodiment of the present invention, the transmission rack is mounted on the lifting part, and both the transmission gear and the driving component are mounted on the upper end portion of the fixed support leg. The lifting part can be driven by the transmission gear to lift together with the transmission rack.

[0028] According to an embodiment of the present invention, the lifting transmission component further includes a driven gear. The driven gear is rotatably mounted on the fixed support leg. When the lifting part moves up and down, the driven gear is driven by the transmission rack to rotate.

[0029] According to an embodiment of the present invention, the lifting strut further includes at least one set of positioning components. The positioning components include a positioning member, at least one positioning hole, and at least one insertion hole. A plurality of the positioning holes and the insertion holes are arbitrarily provided. The positioning holes and the insertion holes are respectively formed on the fixed leg and the lifting part. When the lifting part is lifted or lowered so that a positioning hole corresponds to an insertion hole, the positioning member fixes the lifting part at the lifted or lowered position by simultaneously inserting into the positioning hole and the insertion hole.

[0030] To achieve at least one of the above advantages of the present invention, the present invention provides a working method for a device that combines tidal energy and buoyancy energy for power generation, including the following steps:

[0031] During high tide, the tidal current impacts the blade groups to cause the water turbine to rotate forward. During this process, each blade group sequentially rotates to 0°, 90°, 180°, and 270° and then returns to 0°. When the fixed blade of a blade group rotates away from 90° and rotates to 180°, the corresponding forward rotation positioning member corresponds to the forward rotation indicating structure. The forward rotation positioning member radiates a signal to the forward rotation indicating structure, receives the reflected signal, and feeds it back to the controller. The controller controls the corresponding displacement member to operate to drive the moving blade of the blade group to move away from the fixed blade to expand the airbag. At the same time, when the fixed blade of a blade group rotates away from 180° and rotates to 270°, the corresponding forward rotation positioning member radiates a signal to the area other than the forward rotation indicating structure of the forward rotation positioning indicator and receives the reflected signal and feeds it back to the controller. The controller controls the corresponding displacement member to move to drive the moving blade to move closer to the fixed blade to compress the airbag. At this time, the compressed airbag is deflated, and the expanded airbag is inflated to cause the corresponding blade group to rotate and float, so as to convert buoyancy into the mechanical energy of the water turbine;

[0032] At low tide, the tidal current impacts the blade groups to reverse the water turbine. During this process, each blade group turns to 0°, 270°, 180°, and 90° in sequence and then returns to 0°. When the fixed blade of a blade group turns away from 270° and turns to 180°, the corresponding reverse positioning member corresponds to the reverse indication structure. The reverse positioning member radiates a signal to the reverse indication structure, receives the reflected signal, and feeds it back to the controller. The controller controls the corresponding displacement member to operate to drive the movable blade to move away from the fixed blade to expand the airbag. At the same time, when the fixed blade of a blade group turns away from 180° and turns to 90°, the corresponding reverse positioning member radiates a signal to the area other than the reverse indication structure of the reverse positioning indicator, receives the reflected signal, and feeds it back to the controller. The controller controls the corresponding displacement member to move to drive the movable blade to move closer to the fixed blade to compress the airbag. At this time, the compressed airbag is deflated, and the expanded airbag is inflated to cause the corresponding blade group to rotate and float, so as to convert the buoyancy into the mechanical energy of the water turbine;

[0033] The water turbine drives the generator to operate and generate electricity through the cooperative action of the first rotating transmission member and the second rotating transmission member. Description of the Drawings

[0034] Figure 1 Shows a schematic structural diagram of the device for combined power generation of tidal energy and buoyancy energy according to the present invention.

[0035] Figure 2 Shows a schematic structural diagram of the blade mechanism of the device for combined power generation of tidal energy and buoyancy energy according to the present invention.

[0036] Figure 3 Shows a three-dimensional view of a partial structure of the water turbine of the device for combined power generation of tidal energy and buoyancy energy according to the present invention.

[0037] Figure 4 Shows a three-dimensional view of a partial structure of the water turbine of the device for combined power generation of tidal energy and buoyancy energy according to the present invention in another state.

[0038] Figure 5 Shows a schematic structural diagram of the positioning member of the device for combined power generation of tidal energy and buoyancy energy according to the present invention.

[0039] Figure 6 Shows a cross-sectional view of a partial structure of the device for combined power generation of tidal energy and buoyancy energy according to the present invention.

[0040] Figure 7 Shows a cross-sectional view of the mounting seat of the device for combined power generation of tidal energy and buoyancy energy according to the present invention.

[0041] Figure 8 The partial structural explosion diagram of the mounting base of the device for combined power generation of tidal current energy and buoyancy energy according to the present invention is shown. Specific embodiments

[0042] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and other obvious variations can be conceived by those skilled in the art. The basic principles defined in the following description of the present invention can be applied to other implementation schemes, variant schemes, improvement schemes, equivalent schemes, and other technical schemes without departing from the spirit and scope of the present invention.

[0043] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present invention.

[0044] It can be understood that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "a" should not be construed as limiting the quantity.

[0045] Reference Figure 1 , the device for combined power generation of tidal current energy and buoyancy energy according to a preferred embodiment of the present invention will be elaborated in detail below. The device for combined power generation of tidal current energy and buoyancy energy includes a water turbine 10. The water turbine 10 includes a frame 11. The frame 11 includes a rotating shaft 111 and two mounting members 112. Both of the two mounting members 112 are mounted on the rotating shaft 111 and are arranged at intervals relatively. The water turbine 10 further includes a blade mechanism 12. The blade mechanism 12 includes a plurality of blade groups 121. The blade groups 121 are mounted between the two mounting members 112, and the plurality of blade groups 121 are distributed at intervals around the circumference of the rotating shaft 111. The rotating shaft 111 of the water turbine 10 is horizontally placed in the direction of tidal current movement and part of the blade groups 121 are submerged in water. The plurality of blade groups 121 can be pushed in sequence by the action of tidal current and buoyancy to drive the frame 11 to rotate with the rotating shaft 111 as the rotation axis.

[0046] In this way, due to the arrangement of the horizontal axis of the water turbine 10, the resistance generated by the water turbine 10 to the tidal current is increased to increase the potential energy and kinetic energy of the tidal current energy, and the swept area is increased by arranging the blade group 121 horizontally between the two mounting members 112, so as to obtain more tidal current energy and convert it into mechanical energy.

[0047] Reference Figure 2 , the blade group 121 includes a fixed blade 1211, a movable blade 1212 and an airbag 1213. The fixed blade 1211 is installed on the mounting member 112. The fixed blade 1211 and the movable blade 1212 are arranged opposite to each other. The airbag 1213 is installed between the fixed blade 1211 and the movable blade 1212. The movable blade 1212 can be driven to approach or move away from the fixed blade 1211 to compress or expand the airbag 1213. The airbag 1213 has at least one through port 121301, and the airbag 1213 is inflated and deflated through the through port 121301, so as to be deflated or inflated when it is compressed or expanded.

[0048] The blade mechanism 12 further includes multiple groups of displacement driving members 122. Each movable blade 1212 is installed at one end of a group of displacement driving members 122. The movable blade 1212 can be driven by the displacement driving members 122 to approach or move away from the fixed blade 1211 to compress or expand the airbag 1213, so that the airbag 1213 can be quickly inflated and deflated.

[0049] Preferably, each group of displacement driving members 122 is provided with four, and every two displacement driving members 122 are in a group. The two displacement driving members 122 in each group are arranged at intervals. The two groups of displacement driving members 122 are respectively located at the positions corresponding to the fixed blade 1211 and the two mounting members 112, so that the movable blade 1212 can move stably under the driving action of the two groups of displacement driving members 122.

[0050] Preferably, the displacement driving member 122 is implemented as an electric telescopic cylinder.

[0051] Reference Figures 3 to 4, preferably, each of the air bags 1213 is provided with two of the through ports 121301, the vane mechanism 12 further includes a connecting pipe group 123, the connecting pipe group 123 has a plurality of interfaces 12301, and each of the through ports 121301 of each of the air bags 1213 is communicated with one of the interfaces 12301 through a pipeline. When at least two sets of the driving members 122 are controlled to operate so that the moving vanes 1212 of the corresponding at least two vane groups 121 move, at least one of the moving vanes 1212 approaches the corresponding fixed vane 1211 to compress the corresponding air bag 1213, and at least one of the moving vanes 1212 moves away from the corresponding fixed vane 1211 to expand the corresponding air bag 1213. The gas in the compressed air bag 1213 is introduced into the expanded air bag 1213 through the connecting pipe group 123. During this process, the gas circulates in the air bags 1213 of the vane group 121 and the connecting pipe group 123, without the need to additionally introduce a gas source, the operation is convenient, and the equipment is simplified.

[0052] Preferably, the connecting pipe group 123 includes a plurality of connecting pipes 1231 and a plurality of communicating pipes 1232. The plurality of connecting pipes 1231 are spaced apart from the periphery of the rotating shaft 111, and at least one of the communicating pipes 1232 is arranged between two adjacent connecting pipes 1231 and is communicated through the communicating pipe 1232. Every two of the interfaces 12301 form a pair, at least one pair of the interfaces 12301 is formed on the connecting pipe 1231, and each pair of the interfaces 12301 is docked with the two through ports 121301 of an air bag 1213 through a pipeline. One of the connecting pipes 1231 has an inflation port 123101, and the inflation port 123101 can be communicated with an external gas source to introduce a predetermined amount of gas into the connecting pipe group 123.

[0053] Reference Figure 1 , the device for generating electricity by combining tidal energy and buoyancy energy further includes a rotational transmission assembly 20 and a generator 30. The rotational transmission assembly 20 includes a first rotational transmission member 21 and a second rotational transmission member 22. The first rotational transmission member 21 and the second rotational transmission member 22 are respectively installed on the rotating shaft 111 and the generator 30. The first rotational transmission member 21 cooperates with the second rotational transmission member 22 and can drive the second rotational transmission member 22 to rotate. When the rotating shaft 111 rotates, the rotating shaft 111 drives the generator 30 to operate to generate electricity through the cooperation of the first rotational transmission member 21 and the second rotational transmission member 22.

[0054] Preferably, the size of the second rotational transmission member 22 is smaller than the size of the first rotational transmission member 21 to increase the rotation speed of the generator 30 so that the generator 30 can generate electricity normally.

[0055] Preferably, both the first rotating transmission member 21 and the second rotating transmission member 22 are implemented as helical gears, and the two helical gears are meshed with each other. The rotating shaft 111 drives the generator 30 to operate through the tooth transmission effect.

[0056] It is worth mentioning that the generator 30 is held above the water surface, and based on the semi-submersible design of the water turbine 10, the convenience of overall maintenance and repair is increased.

[0057] Reference Figure 1 、 Figure 5 and Figure 6 During the process that the tidal current at flood tide impacts the blade group 121 and drives the frame 11 to rotate through the blade group 121, the azimuth angle when the end of the blade group 121 away from the rotating shaft 111 faces upward is defined as 0°, the azimuth angle when the blade group 121 rotates away from 0° and keeps horizontal is defined as 90°, the azimuth angle when the blade group 121 rotates in the same direction to rotate away from 90° and the end of the blade group 121 away from the rotating shaft 111 faces downward is defined as 180°, and the azimuth angle when the blade group 121 rotates in the same direction to rotate away from 180° and keeps horizontal again is defined as 270°. The direction in which the tidal current at flood tide impacts the blade group 121 to make the water turbine 10 rotate is defined as the positive direction, and the direction in which the tidal current at ebb tide impacts the blade group 121 to make the water turbine 10 rotate is defined as the negative direction.

[0058] The device for combined power generation of tidal energy and buoyancy energy further includes a control mechanism 40. The control mechanism 40 includes a position measuring member 41 and a controller 42. The displacement member 122 is controllably connected to the controller 42. The position measuring member 41 includes a flood tide position measuring assembly 411 and an ebb tide position measuring assembly 412. The flood tide position measuring assembly 411 includes a plurality of forward rotation position measuring members 4111 and a forward rotation position measuring indicator 4112. The ebb tide position measuring assembly 412 includes a plurality of reverse rotation position measuring members 4121 and a reverse rotation position measuring indicator 4122. The forward rotation position measuring members 4111 and the reverse rotation position measuring members 4121 are both communicatively connected to the controller 42. The number of the forward rotation position measuring members 4111 and the reverse rotation position measuring members 4121 is the same as the number of the blade groups 121. Each forward rotation position measuring member 4111 and each reverse rotation position measuring member 4121 are respectively used to detect the position of a blade group 121 when it rotates in the positive direction and the negative direction. The forward rotation position measuring members 4111 and the forward rotation position measuring indicator 4112 are arranged on the same side and can be driven to rotate relative to the forward rotation position measuring indicator 4112. The reverse rotation position measuring members 4121 and the reverse rotation position measuring indicator 4122 are arranged on the same side and can be driven to rotate relative to the reverse rotation position measuring indicator 4122.

[0059] A forward rotation position measuring indicator 4112 forms a forward rotation indicating structure 41121 at a portion where the azimuth is between 180° and 270°. The forward rotation indicating structure 41121 corresponds to a part of the rotation path of the forward rotation position measuring member 4111 driven to rotate. The forward rotation position measuring member 4111 can radiate signals to the forward rotation position measuring indicator 4112 and receive reflected signals. The controller 42 controls the corresponding displacement member 122 to operate according to the feedback of the forward rotation position measuring member 4111 to drive the moving blade 1212 to approach or move away from the fixed blade 1211.

[0060] During the process that the tidal current at flood tide impacts the blade group 121 to cause the water turbine 10 to rotate forward, the fixed blade 1211 of one blade group 121 rotates away from 90° and rotates to 180°. At this time, the corresponding forward rotation position measuring member 4111 corresponds to the forward rotation indicating structure 41121. The forward rotation position measuring member 4111 radiates signals to the forward rotation indicating structure 41121, receives the reflected signals and feeds back to the controller 42. The controller 42 controls the corresponding displacement member 122 to operate to drive the moving blade 1212 to move away from the fixed blade 1211 to expand the airbag 1213. At this time, the expanded airbag 1213 is inflated to generate buoyancy, so that the corresponding blade group 121 rotates from 180° to 270° to promote the rotation of the water turbine 10, realizing the conversion of buoyancy into the mechanical energy of the water turbine 10. At the same time, the fixed blade 1211 of one blade group 121 rotates away from 180° and rotates to 270°. The corresponding forward rotation position measuring member 4111 radiates signals to an area of the forward rotation position measuring indicator 4112 other than the forward rotation indicating structure 41121, receives the reflected signals and feeds back to the controller 42. The controller 42 controls the corresponding displacement member 122 to move to drive the moving blade 1212 to move close to the fixed blade 1211 to compress the airbag 1213. At this time, the compressed airbag 1213 is deflated, and the corresponding blade group 121 rotates from 270° to 90°, preventing the corresponding blade group 121 from being hindered in movement by the buoyancy force when rotating from 90° to 180° subsequently.

[0061] A reverse rotation position measuring indicator 4122 forms a reverse rotation indicating structure 41221 at a portion where the azimuth is between 180° and 90°. The reverse rotation indicating structure 41221 corresponds to a part of the rotation path of the reverse rotation position measuring member 4121 driven to rotate. The reverse rotation position measuring member 4121 can radiate signals to the reverse rotation position measuring indicator 4122 and receive reflected signals. The controller 42 controls the corresponding displacement member 122 to operate according to the feedback of the reverse rotation position measuring member 4121 to drive the moving blade 1212 to approach or move away from the fixed blade 1211.

[0062] During the process of the ebb tide current impacting the blade group 121 to reverse the water turbine 10, the fixed blade 1211 of one blade group 121 rotates away from 270° and rotates to 180°. At this time, the corresponding reverse position measuring member 4121 corresponds to the reverse indication structure 41221. The reverse position measuring member 4121 radiates a signal to the reverse indication structure 41221, receives the reflected signal, and feeds it back to the controller 42. The controller 42 controls the corresponding displacement member 122 to operate to drive the movable blade 1212 to move away from the fixed blade 1211 to expand the airbag 1213. At this time, the expanded airbag 1213 is inflated to generate buoyancy, so that the corresponding blade group 121 rotates from 180° to 90°, to promote the rotation of the water turbine 10 and realize the conversion of buoyancy into the mechanical energy of the water turbine 10. At the same time, the fixed blade 1211 of one blade group 121 rotates away from 180° and rotates to 90°. The corresponding reverse position measuring member 4121 radiates a signal to the area of the reverse position measuring indicator 4122 other than the reverse indication structure 41221, receives the reflected signal, and feeds it back to the controller 42. The controller 42 controls the corresponding displacement member 122 to move to drive the movable blade 1212 to move close to the fixed blade 1211 to compress the airbag 1213. At this time, the compressed airbag 1213 is deflated, and the corresponding blade group 121 rotates from 90° to 270°, to prevent the corresponding blade group 121 from being hindered in movement by the buoyancy force when it rotates from 270° to 180° later.

[0063] It is worth mentioning that whether it is high tide or low tide, the actual rotation direction of the blade group 121 maintained at 180° is opposite to the pushing rotation direction of the tide current acting on the corresponding blade group 121. At this time, the blade group 121 is in a negative energy state. By inflating the airbag 1213 of the corresponding blade group 121 to make it obtain kinetic energy again, the water turbine 10 is kept rotating to realize the conversion of buoyancy energy into the mechanical energy of the water turbine 10.

[0064] During this process, based on the utilization of tidal current energy, buoyancy is used to make the blade group 121 in a negative energy state obtain kinetic energy again to promote the rotation of the water turbine 10, realizing the combined power generation of tidal current energy and buoyancy energy. Compared with only using tidal current energy, the consumption of tidal current energy is reduced, and the power generation efficiency is guaranteed. In addition, the water turbine 10 can rotate forward during high tide and reverse during low tide. Furthermore, the generator 30 can be driven to rotate forward or reverse to generate electricity, effectively improving the power generation efficiency.

[0065] It should be noted that the air bags 1213 of the multiple blade groups 121 are alternately inflated and deflated to drive the rotation of the water turbine 10 by buoyancy, convert the buoyancy energy into mechanical energy and finally into electrical energy, overcome the defect that power cannot be generated during the slack tide of the tidal current, achieve 24-hour uninterrupted power generation, and have a higher power generation efficiency.

[0066] Preferably, the forward rotation positioning member 4111 and the reverse rotation positioning member 4121 are both implemented as ultrasonic sensors, and the forward rotation indication structure 41121 and the reverse rotation indication structure 41221 are both implemented as arc grooves. When the water turbine 10 rotates forward, the forward rotation positioning member 4111 can emit ultrasonic waves to the forward rotation positioning indicator 4112 and receive the reflected ultrasonic waves, and detect the position of the fixed blade 1211 of the corresponding blade group 121 by measuring the distances between it and different regions of the forward rotation positioning indicator 4112. When the water turbine 10 rotates in reverse, the reverse rotation positioning member 4121 can emit ultrasonic waves to the reverse rotation positioning indicator 4122 and receive the reflected ultrasonic waves, and detect the position of the fixed blade 1211 of the corresponding blade group 121 by measuring the distances between it and different regions of the reverse rotation positioning indicator 4122.

[0067] Reference Figure 1 、 Figure 7 and Figure 8 The device for generating electricity by combining tidal current energy and buoyancy energy further includes two mounting seats 50. The mounting seats 50 are fixed to the seabed soil layer, and the two mounting seats 50 are arranged opposite to each other. The two end portions of the rotating shaft 111 are rotatably mounted on the two mounting seats 50. The water turbine 10 is supported by the mounting seats 50 and is kept in the water.

[0068] The mounting seat 50 includes a mounting main body 51. The mounting main body 51 includes a fixed leg 511 and a lifting part 512. The bottom of the fixed leg 511 is fixedly mounted on the seabed soil layer, and the two end portions of the rotating shaft 111 are respectively rotatably mounted on the two lifting parts 512. The lifting part 512 is vertically liftably connected to the fixed leg 511.

[0069] The mounting base 50 further includes a plurality of lifting transmission components 52 and a plurality of driving components 53. The lifting transmission component 52 includes a transmission gear 521 and a transmission rack 522. The transmission rack 522 extends vertically and meshes with the transmission gear 521. The transmission gear 521 is installed on the driving component 53, and the driving component 53 is used to drive the transmission gear 521 to rotate. Either the transmission rack 522 or the transmission gear 521 is installed on the lifting part 512 and the other is installed on the fixed leg 511. When the transmission gear 521 is driven by the driving component 53 to rotate, the lifting part 512 can move vertically under the cooperation of the transmission gear 521 and the transmission rack 522 to drive the water turbine 10 to lift, so as to adjust the height of the water turbine 10, and to increase or decrease the rotation speed of the water turbine 10 by increasing or decreasing the contact surface between the water turbine 10 and the tidal current, so that the rotation speed of the water turbine 10 is maintained within a certain range, ensuring the stable power generation of the generator 30 and effectively avoiding the situation that the power generation is affected due to the unstable speed of the tidal current.

[0070] In addition, when the plurality of lifting transmission components 52 transmit driving force to the lifting part 512, they also limit the moving direction of the lifting part 512, so that the lifting part 512 moves smoothly.

[0071] Preferably, the transmission rack 522 is installed on the lifting part 512. The transmission gear 521 and the driving component 53 are both installed on the upper end of the fixed leg 511, and the lifting part 512 can be driven by the transmission gear 521 to lift together with the transmission rack 522.

[0072] Preferably, the driving component 53 is implemented as a hydraulic motor.

[0073] Furthermore, the lifting transmission component 52 further includes a driven gear 523, and the driven gear 523 is rotatably installed on the fixed leg 511. When the lifting part 512 moves up and down, the driven gear 523 is driven by the transmission rack 522 to rotate. The driven gear 523 is used to limit the moving direction of the lifting part 512 and increase the stability of the lifting of the lifting part 512.

[0074] Reference Figure 2, Further, the mounting base 50 further includes at least one set of positioning components 54. The positioning components 54 include a positioning member 541, at least one positioning hole 542, and at least one insertion hole 543. A plurality of the positioning holes 542 and the insertion holes 543 are arbitrarily provided. The positioning holes 542 and the insertion holes 543 are respectively formed in the fixed leg 511 and the lifting part 512. When the lifting part 512 is lifted so that one of the positioning holes 542 corresponds to one of the insertion holes 543, the positioning member 541 fixes the lifting part 512 at the lifted position by simultaneously inserting into the positioning hole 542 and the insertion hole 543.

[0075] Preferably, one positioning hole 542 is provided, and a plurality of the insertion holes 543 are provided and the plurality of insertion holes 543 are vertically spaced apart. One of the insertion holes 543 can correspond to the positioning hole 542 formed in the fixed leg 511 when the lifting part 512 moves to a predetermined height. At this time, the positioning member 541 can penetrate through the positioning hole 542 and insert into the corresponding insertion hole 543 to fix the lifting part 512 at the predetermined height.

[0076] Alternatively, a plurality of the positioning holes 542 are provided and the plurality of positioning holes 542 are vertically spaced apart, and one insertion hole 543 is provided. One of the positioning holes 542 can correspond to the insertion hole 543 when the lifting part 512 moves to a preset height. At this time, the positioning member 541 can penetrate through the corresponding insertion hole 543 and insert into the positioning hole 542 to fix the lifting part 512 at the predetermined height.

[0077] Preferably, the mounting body 51 further includes a bearing 513. The bearing 513 is installed between the lifting part 512 and the rotating shaft 111. The bearing 513 is used to support the rotating shaft 111 and reduce the friction when the rotating shaft 111 rotates.

[0078] Now, a working method of the device for combining tidal energy and buoyancy energy for power generation is proposed, including the following steps:

[0079] During high tide, the tidal current impacts the blade group 121 to rotate the water turbine 10 forward. During this process, each blade group 121 rotates to 0°, 90°, 180°, and 270° in sequence and then returns to 0°. When the fixed blade 1211 of a blade group 121 rotates away from 90° and rotates to 180°, the corresponding forward rotation positioning member 4111 corresponds to the forward rotation indicating structure 41121. The forward rotation positioning member 4111 radiates a signal to the forward rotation indicating structure 41121, receives the reflected signal, and feeds it back to the controller 42. The controller 42 controls the corresponding displacement member 122 to operate to drive the movable blade 1212 of the blade group 121 to move away from the fixed blade 1211 to expand the airbag 1213. At the same time, when the fixed blade 1211 of a blade group 121 rotates away from 180° and rotates to 270°, the corresponding forward rotation positioning member 4111 radiates a signal to the area of the forward rotation positioning indicator 4112 other than the forward rotation indicating structure 41121, receives the reflected signal, and feeds it back to the controller 42. The controller 42 controls the corresponding displacement member 122 to move to drive the movable blade 1212 to move closer to the fixed blade 1211 to compress the airbag 1213. At this time, the compressed airbag 1213 is deflated, and the expanded airbag 1213 is inflated to make the corresponding blade group 121 rotate and float, so as to convert the buoyancy into the mechanical energy of the water turbine 10;

[0080] During low tide, the tidal current impacts the blade group 121 to rotate the water turbine 10 in reverse. During this process, each blade group 121 rotates to 0°, 270°, 180°, and 90° in sequence and then returns to 0°. When the fixed blade 1211 of a blade group 121 rotates away from 270° and rotates to 180°, the corresponding reverse rotation positioning member 4121 corresponds to the reverse rotation indicating structure 41221. The reverse rotation positioning member 4121 radiates a signal to the reverse rotation indicating structure 41221, receives the reflected signal, and feeds it back to the controller 42. The controller 42 controls the corresponding displacement member 122 to operate to drive the movable blade 1212 of the blade group 121 to move away from the fixed blade 1211 to expand the airbag 1213. At the same time, when the fixed blade 1211 of a blade group 121 rotates away from 180° and rotates to 90°, the corresponding reverse rotation positioning member 4121 radiates a signal to the area of the reverse rotation positioning indicator 4122 other than the reverse rotation indicating structure 41221, receives the reflected signal, and feeds it back to the controller 42. The controller 42 controls the corresponding displacement member 122 to move to drive the movable blade 1212 to move closer to the fixed blade 1211 to compress the airbag 1213. At this time, the compressed airbag 1213 is deflated, and the expanded airbag 1213 is inflated to make the corresponding blade group 121 rotate and float, so as to convert the buoyancy into the mechanical energy of the water turbine 10;

[0081] The water turbine 10 drives the generator 30 to operate and generate electricity through the cooperative action of the first rotating transmission member 21 and the second rotating transmission member 22.

[0082] Preferably, the working method of the device for generating electricity by combining tidal energy and buoyancy energy further includes the following steps:

[0083] The driving assembly 53 rotates through the driving transmission gear 521, and the lifting part 512 is driven to move up and down relative to the fixed leg 511 through the meshing action of the transmission gear 521 and the transmission rack 522, so as to adjust the position of the water turbine 10 installed on the lifting part 512 in water, and increase or decrease the contact surface between the water turbine 10 and the tidal current to increase or decrease the rotation speed of the water turbine 10, so that the rotation speed of the water turbine 10 is maintained within a certain range, ensuring the stable power generation of the generator 30.

[0084] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention can have any deformation or modification without departing from the above principles.

Claims

1. Equipment for combined power generation of tidal current energy and buoyancy energy, characterized in that, The device for combining tidal energy and buoyancy energy to generate electricity includes: A water turbine, and the water turbine includes: A frame, and the frame includes a rotating shaft and two mounting members. Both of the two mounting members are mounted on the rotating shaft and are arranged at a relative interval; A blade mechanism, and the blade mechanism includes: Multiple blade groups. The blade groups are mounted between the two mounting members, and the multiple blade groups are distributed at intervals on the circumference of the rotating shaft. The rotating shaft of the water turbine is horizontally placed in the tidal current movement direction and part of the blade groups are submerged in water. The blade group includes a fixed blade, a movable blade and an airbag. The fixed blade is mounted on the mounting member. The fixed blade and the movable blade are arranged oppositely. The airbag is mounted between the fixed blade and the movable blade. The movable blade can be driven to approach or move away from the fixed blade to compress or expand the airbag. The airbag has at least one through port. The airbag is inflated and deflated through the through port to be deflated or inflated when it is compressed or expanded. During the process that the tidal current at flood tide impacts the blade group and drives the frame to rotate through the blade group, the azimuth angle when the end of the blade group away from the rotating shaft faces upward is defined as 0°. The azimuth angle when the blade group rotates away from 0° and keeps horizontal is defined as 90°. The azimuth angle when the blade group rotates in the same direction away from 90° and the end of the blade group away from the rotating shaft faces downward is defined as 180°. The azimuth angle when the blade group rotates in the same direction away from 180° and keeps horizontal again is defined as 270°. The direction in which the tidal current at flood tide impacts the blade group to make the water turbine rotate is defined as the positive direction, and the direction in which the tidal current at ebb tide impacts the blade group to make the water turbine rotate is defined as the negative direction; Multiple groups of displacement driving members. Each movable blade is mounted on one end of a group of the displacement driving members. The movable blade can be driven by the displacement driving members to approach or move away from the fixed blade to compress or expand the airbag; A generator, A rotation transmission assembly, and the rotation transmission assembly includes a first rotation transmission member and a second rotation transmission member. The first rotation transmission member and the second rotation transmission member are respectively mounted on the rotating shaft and the generator. The first rotation transmission member is matched with the second rotation transmission member and can drive the second rotation transmission member to rotate. When the rotating shaft rotates, the rotating shaft drives the generator to operate to generate electricity through the cooperation of the first rotation transmission member and the second rotation transmission member; A control mechanism, and the control mechanism includes: A controller, and the displacement driving members are controllably connected to the controller; A positioning member, the positioning member includes a rising tide positioning component and a ebbing tide positioning component. The rising tide positioning component includes a plurality of forward rotation positioning members and a forward rotation positioning indicator. The ebbing tide positioning component includes a plurality of reverse rotation positioning members and a reverse rotation positioning indicator. The forward rotation positioning members and the reverse rotation positioning members are both communicatively connected to the controller. The number of the forward rotation positioning members and the reverse rotation positioning members provided is the same as the number of the blade groups. Each of the forward rotation positioning members and each of the reverse rotation positioning members are respectively used to detect the positions when a corresponding blade group rotates forward and reversely. The forward rotation positioning members are arranged on the same side as the forward rotation positioning indicator and can be driven to rotate relative to the forward rotation positioning indicator. The reverse rotation positioning members are arranged on the same side as the reverse rotation positioning indicator and can be driven to rotate relative to the reverse rotation positioning indicator. A forward rotation indicating structure is formed on a part of the forward rotation positioning indicator with an azimuth between 180° and 270°. The forward rotation indicating structure corresponds to a part of the rotation path of the driven forward rotation positioning members. The forward rotation positioning members can radiate signals to the forward rotation positioning indicator and receive reflected signals. The controller controls the corresponding displacement members to operate according to the feedback of the forward rotation positioning members to drive the movable blade to approach or move away from the fixed blade. A reverse rotation indicating structure is formed on a part of the reverse rotation positioning indicator with an azimuth between 180° and 90°. The reverse rotation indicating structure corresponds to a part of the rotation path of the driven reverse rotation positioning members. The reverse rotation positioning members can radiate signals to the reverse rotation positioning indicator and receive reflected signals. The controller controls the corresponding displacement members to operate according to the feedback of the reverse rotation positioning members to drive the movable blade to approach or move away from the fixed blade.

2. The device for combined power generation of tidal current energy and buoyancy energy according to claim 1, wherein Each of the air bags is provided with two through openings. The blade mechanism further includes a communication pipe group. The communication pipe group has a plurality of interfaces. Each of the through openings of each of the air bags is communicated with an interface through a pipeline. When at least two displacement members are controlled to operate so that the movable blades of at least two corresponding blade groups move, at least one movable blade approaches the corresponding fixed blade to compress the corresponding air bag, and at least one movable blade moves away from the corresponding fixed blade to expand the corresponding air bag. The gas in the compressed air bag is introduced into the expanded air bag through the communication pipe group.

3. The device for generating electricity by combining tidal current energy and buoyancy energy according to claim 2, characterized in that, The communication pipe group includes a plurality of connecting pipes and a plurality of communicating pipes. The plurality of connecting pipes are spaced apart from each other on the circumference of the rotating shaft. At least one communicating pipe is arranged between adjacent two connecting pipes and is communicated through the communicating pipe. Every two interfaces form a pair. At least one pair of interfaces are formed on the connecting pipes. And each pair of interfaces is docked with the two through openings of an air bag through a pipeline. One of the connecting pipes has an inflation port. The inflation port can be communicated with an external air source to introduce a predetermined amount of gas into the communication pipe group.

4. The device for generating electricity by combining tidal current energy and buoyancy energy according to any one of claims 1 to 3, characterized in that, The forward rotation positioning member and the reverse rotation positioning member are both implemented as ultrasonic sensors, and the forward rotation indication structure and the reverse rotation indication structure are both implemented as arc grooves.

5. The device for generating electricity by combining tidal current energy and buoyancy energy according to claim 1, characterized in that, The device for generating electricity by combining tidal energy and buoyancy energy further includes two mounting seats, the mounting seats are fixed to the seabed soil layer, the two mounting seats are arranged oppositely, the two end portions of the rotating shaft are rotatably mounted on the two mounting seats, and the water turbine is supported by the mounting seats and kept in the water.

6. The device for combined power generation of tidal current energy and buoyancy energy according to claim 5, wherein The mounting seat includes a mounting main body, the mounting main body includes a fixed leg and a lifting part, the bottom of the fixed leg is fixedly mounted on the seabed soil layer, the two end portions of the rotating shaft are respectively rotatably mounted on the two lifting parts, the lifting part is vertically liftably connected to the fixed leg, the lifting support column further includes a plurality of lifting transmission components and a plurality of driving components, the lifting transmission component includes a transmission gear and a transmission rack, the transmission rack extends vertically and meshes with the transmission gear, the transmission gear is mounted on the driving component, the driving component is used for driving the transmission gear to rotate, either the transmission rack or the transmission gear is mounted on the lifting part and the other is mounted on the fixed leg, when the transmission gear is driven by the driving component to rotate, the lifting part can vertically move under the cooperation of the transmission gear and the transmission rack to drive the water turbine to lift.

7. The device for combined power generation of tidal current energy and buoyancy energy according to claim 6, characterized in that, The transmission rack is mounted on the lifting part, the transmission gear and the driving component are both mounted on the upper end portion of the fixed leg, and the lifting part can be driven by the transmission gear to lift together with the transmission rack.

8. The device for generating electricity by combining tidal current energy and buoyancy energy according to claim 7, characterized in that, The lifting transmission component further includes a driven gear, the driven gear is rotatably mounted on the fixed leg, and when the lifting part moves up and down, the driven gear is driven by the transmission rack to rotate.

9. The device for combined power generation of tidal current energy and buoyancy energy according to claim 6, characterized in that, The lifting support column further includes at least one set of positioning components, the positioning component includes a positioning member, at least one positioning hole and at least one insertion hole, the positioning hole and the insertion hole are arbitrarily provided with a plurality of, the positioning hole and the insertion hole are respectively formed on the fixed leg and the lifting part, when the lifting part lifts to make a positioning hole correspond to an insertion hole, the positioning member fixes the lifting part at the lifted position by simultaneously inserting the positioning hole and the insertion hole.

10. Working method of a device for combined power generation of tidal energy and buoyancy energy, characterized in that, Including the following steps: During high tide, the tidal current impacts the blade groups to rotate the water turbine forward. During this process, each of the said blade groups sequentially rotates to 0°, 90°, 180°, and 270° and then returns to 0°. When the fixed blade of a said blade group rotates away from 90° and rotates to 180°, the corresponding forward rotation positioning member corresponds to the forward rotation indicating structure. The forward rotation positioning member radiates signals to the forward rotation indicating structure, receives the reflected signals, and feeds them back to the controller. The controller controls the operation of the corresponding displacement member to drive the moving blade of the blade group to move away from the fixed blade to expand the airbag. At the same time, when the fixed blade of a said blade group rotates away from 180° and rotates to 270°, the corresponding forward rotation positioning member radiates signals to the area of the forward rotation positioning indicator other than the forward rotation indicating structure, receives the reflected signals, and feeds them back to the controller. The controller controls the movement of the corresponding displacement member to drive the moving blade to move closer to the fixed blade to compress the airbag. At this time, the compressed airbag is deflated, and the expanded airbag is inflated to cause the corresponding blade group to rotate and float, so as to convert buoyancy into the mechanical energy of the water turbine; During low tide, the tidal current impacts the blade groups to rotate the water turbine backward. During this process, each of the said blade groups sequentially rotates to 0°, 270°, 180°, and 90° and then returns to 0°. When the fixed blade of a said blade group rotates away from 270° and rotates to 180°, the corresponding reverse rotation positioning member corresponds to the reverse rotation indicating structure. The reverse rotation positioning member radiates signals to the reverse rotation indicating structure, receives the reflected signals, and feeds them back to the controller. The controller controls the operation of the corresponding displacement member to drive the moving blade of the blade group to move away from the fixed blade to expand the airbag. At the same time, when the fixed blade of a said blade group rotates away from 180° and rotates to 90°, the corresponding reverse rotation positioning member radiates signals to the area of the reverse rotation positioning indicator other than the reverse rotation indicating structure, receives the reflected signals, and feeds them back to the controller. The controller controls the movement of the corresponding displacement member to drive the moving blade to move closer to the fixed blade to compress the airbag. At this time, the compressed airbag is deflated, and the expanded airbag is inflated to cause the corresponding blade group to rotate and float, so as to convert buoyancy into the mechanical energy of the water turbine; The water turbine drives the generator to operate and generate electricity through the cooperative action of the first rotating transmission member and the second rotating transmission member.

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