CN113864102B - Vortex-induced vibration power generation device in underwater suspension state - Google Patents

Abstract

The invention provides a vortex-induced vibration power generation device in an underwater suspension state, which is skillfully combined with a submerged buoy, and when ocean current flows through a cylindrical acting body of the device, vortex-induced vibration is generated, so that the cylindrical acting body moves back and forth along a guide rail, thereby driving a rack and a gear to be meshed and driven to generate electric energy, the generated electric energy can be directly transmitted to the submerged buoy, the submerged buoy is provided with electric power working for a long time, and the device can be self-adapted to the ocean current direction to carry out position adjustment, so that the ocean current energy conversion efficiency is improved. In addition, the device can be grafted at any depth position of the submerged buoy cable, a group of devices can be respectively grafted at the positions of a plurality of cables with different depths, generated electric energy can be directly transmitted to equipment installed on the nearby cables, and in addition, the electric energy generated by the devices can be stored to supply power for passing submarines or underwater vehicles.

Description

A vortex-induced vibration power generation device in an underwater suspended state

Technical Field

The invention belongs to the technical field of development and utilization of marine renewable energy, and in particular relates to a vortex-induced vibration power generation device in an underwater suspension state.

Background technique

A submerged buoy is a device that is connected to an anchor body on the seabed by a cable and suspended in the seawater. It is used to detect ocean data in the three-dimensional space of the seawater. It completes the corresponding tasks by installing hydroacoustic, water pressure, water temperature, water quality and other detection equipment at the cable position at different seawater depths. Submerged buoys are usually anchored for a long time in the sea area at a depth of hundreds or even thousands of meters underwater. All the installed equipment requires electricity to maintain operation. The power of these equipment comes from the battery that the submerged buoy carries. However, the battery is limited by factors such as volume, quality, and cost. Therefore, the capacity of the submerged buoy battery is limited. Usually, the submerged buoy works underwater for 8 to 20 months. When the power of the battery is exhausted, the equipment carried by the submerged buoy will not work properly due to the exhaustion of power. Since the cost of deploying submerged buoys is very high, the failure of the battery to continuously supply power will cause great losses. Therefore, how to make the submerged buoy have the power to work for a long time is one of the problems that need to be solved urgently.

As we all know, there are many renewable energy sources in the ocean, such as ocean current energy, wave energy, tidal energy, etc. Among them, wave energy is most abundant in the underwater near-sea area. When the water depth exceeds 10 meters, the fluctuation speed of the sea water is slow, and the effect of the waves is small. In addition, the energy of tidal energy only acts on the surface area of the sea water. Therefore, for the submerged buoy anchored hundreds of meters or even thousands of meters under the water, wave energy and tidal energy are difficult to use. Ocean current energy is a renewable energy source that is active underwater for a long time and exists at any depth. When the submerged buoy is deployed in a specific sea area, it is always affected by the ocean current, so the submerged buoy has a unique advantage in using ocean current energy.

For example, a Chinese patent with the patent number CN 107733285 A discloses an underwater omnidirectional vortex-induced vibration power generation device, which uses the vortex-induced vibration effect of a cylindrical rod to capture the kinetic energy of the tide, and uses four circumferentially evenly distributed piezoelectric ceramics to generate electricity through the cylindrical rod. When the direction of the ocean current is parallel to the four circumferential directions, the cylindrical rod is positively extruding the piezoelectric ceramic, and the device achieves the optimal power generation effect. However, in fact, the direction of the ocean current is non-directional, so in most cases, the direction of the ocean current always has an angle with the positive extrusion direction of the piezoelectric ceramic, that is, the component force of the cylindrical rod produces an extrusion effect on the piezoelectric ceramic, and this component force is required. The pressure is smaller than the positive extrusion pressure, so the utilization rate of the device for the ocean current is low; for example, the Chinese patent with patent number CN107834903A discloses a vortex-induced vibration power generation device for an underwater moored platform, which uses the alternating vortex generated by the ocean current passing through the moored platform, and then acts on the lightweight flat plate to squeeze the piezoelectric ceramics for power generation. When the direction of the ocean current is parallel to the lightweight flat plate, the device achieves the optimal power generation effect, but in most cases, the direction of the ocean current is always not parallel to the lightweight flat plate, and the device cannot adjust its position as the direction of the ocean current changes, so the utilization rate of the device for the ocean current is low. Such patents currently propose to fix the device at a fixed point on the seabed for energy recovery. If such a device is used to power detection equipment in different water depths, the problem of long-distance power transmission must be solved first. Since the working conditions on the seabed are relatively complex and the requirements for cables are particularly high, it is very difficult to solve. In addition, for the deep sea, since the water pressure on the deep seabed is very high, this requires a particularly high pressure resistance of the device. Therefore, this method of installing the device on the seabed has prominent disadvantages and has obvious shortcomings in implementation.

In response to the above problems, a vortex-induced vibration power generation device in an underwater suspended state is proposed. The device is cleverly combined with a submerged buoy and can be grafted at any depth of the submerged buoy cable. In addition, the position of the device can be adjusted according to the direction of the ocean current. Compared with other existing invented devices, the energy conversion rate and practical application value of the device are higher.

Summary of the invention

The purpose of the present invention is to address the above-mentioned problems and to propose a vortex-induced vibration power generation device in an underwater suspended state. The device is cleverly combined with a marine buoy and can be grafted at any depth of the buoy cable. The device is suspended underwater, with one end connected to the marine buoy through an upper cable and the other end connected to the underwater anchor body through a lower cable. When the ocean current flows through the cylindrical acting body of the device, vortex-induced vibrations will be generated, resulting in alternating vortices, which will cause the cylindrical acting body to move back and forth in a direction perpendicular to the ocean current, and finally generate electrical energy through the meshing transmission of gears and racks.

The device of the present invention comprises: an upper base, a lower base, a bracket, a guide rail connecting plate, a guide rail, a cylindrical acting body, an upper slider, a lower slider, a generator, a shaft seal, a gear, a rack, a spring, an upper inflatable float, an upper damping plate, an upper wake plate, a lower inflatable float, a lower damping plate, a lower wake plate, a rotating buckle and a rotating groove.

The frame of the device is composed of an upper base and a lower base connected by three groups of brackets; the upper base and the lower base are both cylinders with a certain thickness, the thickness of the upper base is greater than that of the lower base, and the diameters of the upper and lower bases are equal and coaxial; there are three groups of brackets, all of which are round rods made of lightweight materials, and the three groups of brackets are evenly distributed between the upper and lower bases and tangent to the outer edges of the bases.

There are four guide rail connecting plates in total, two of which are relatively installed at the lower plane edge of the upper base, and the other two guide rail connecting plates are relatively installed at the upper plane edge of the lower base; the guide rail is a cylindrical rod, and there are two of them in total, one is fixed between the two guide rail connecting plates of the upper base, and the other is fixed between the two guide rail connecting plates of the lower base.

The generator is installed inside the upper base. A through hole is preset at the bottom of the upper base so that the generator output shaft can pass through. A gear is installed on the generator output shaft. The shaft seal is arranged at the preset through hole of the upper base.

The cylindrical body is made of a lightweight material with the same density as seawater; the upper slider is a rectangular block structure, with a through hole equal to the diameter of the guide rail opened on the upper slider, and the upper slider is fixed to the upper bottom surface of the cylindrical body; the lower slider is the same as the upper slider and is fixed to the lower bottom surface of the cylindrical body. During installation, the guide rail on the upper base is passed through the through hole of the upper slider, and the guide rail on the lower base is passed through the through hole of the lower slider, so that the cylindrical body can move back and forth along the guide rail.

The springs are used to connect the slider and the guide rail connecting plate. The upper slider needs two springs to be connected to the two guide rail connecting plates of the upper base, and the lower slider needs two springs to be connected to the two guide rail connecting plates of the lower base.

The rack is installed on the upper bottom surface of the cylindrical actuator. The module and pressure angle of the rack are the same as those of the gear, and the rack is meshed with the gear when installed.

The upper inflatable float is arranged on the upper plane of the upper base, and the top surface of the upper inflatable float is made into an inclined surface with an inclination degree between 2° and 5°; the lower inflatable float is arranged on the lower plane of the lower base, and the bottom surface of the lower inflatable float is made into an inclined surface with an inclination degree between 2° and 5°. The top surface of the upper inflatable float is kept parallel to the bottom surface of the lower inflatable float, and the upper inflatable float and the lower inflatable float are filled with air. The gas volume in the lower inflatable float is greater than the gas volume in the upper inflatable float. The swivel buckle is fixed on the top surface of the upper inflatable float and the bottom surface of the lower inflatable float respectively; the swivel groove is respectively arranged at the bottom end of the upper cable and the top end of the lower cable, and the swivel buckle in the upper inflatable float cooperates with the swivel groove in the upper cable to realize mutual rotation. Similarly, the swivel buckle in the lower inflatable float and the swivel groove in the lower cable can also rotate with each other. When designing the top surface of the upper inflatable float and the bottom surface of the lower inflatable float, it should be ensured that the upper cable and the lower cable are kept in the same straight line when tensioned.

The upper wake plate is rigidly welded to the upper base via a connecting rod; and the lower wake plate is rigidly welded to the lower base via a connecting rod.

The upper damping plate is arranged in the middle of the upper plane of the upper base, and is cleverly combined with the upper inflatable float at the beginning of the structural design; the lower damping plate is arranged in the middle of the lower plane of the lower base, and is cleverly combined with the lower inflatable float at the beginning of the structural design. The plate surfaces of the upper and lower damping plates are on the same plane as the plate surfaces of the upper and lower wake plates.

When a current flows through the device, the current will produce a vortex-induced vibration effect on the cylindrical acting body, and alternating vortices will appear on both sides of the cylindrical acting body, which will cause the cylindrical acting body to move back and forth along the guide rail, thereby driving the rack and gear to engage and transmit, and finally generate electricity through the generator; if the direction of the current is not parallel to the wake board of the device, the wake board will be pushed to rotate under the action of the current, and then the turnbuckles on the upper and lower inflatable floats of the device will rotate relative to the turning grooves on the cable until the wake board rotates to be parallel to the water flow direction, and then stops rotating.

Beneficial effects of the present invention:

1. The present invention is cleverly combined with an ocean buoy. The device is suspended in the water. When the ocean current flows, the device can adjust its position according to the direction of the ocean current to ensure that the cylindrical acting body always has the maximum oscillation amplitude, thereby improving the efficiency of the device in utilizing ocean current energy.

2. This device can be grafted at any depth of the submerged buoy cable. Compared with the existing power generation devices, this device does not need to be installed on the seabed. Therefore, the device does not need to have excessive pressure bearing capacity and long-distance power transmission problems.

3. The device can also be grafted with a group of devices at the positions of multiple cables at different depths. The generated electric energy can be directly transmitted to the equipment installed on the nearest cable. In addition, the electric energy generated by the device can also be stored to power passing submersibles or underwater vehicles.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the present invention;

Fig. 2 is a schematic diagram of the composition of the framework of the present invention;

FIG3 is a schematic diagram of the connection between the guide rail connecting plate and the guide rail of the present invention;

Fig. 4 is a schematic diagram of the installation position of the generator of the present invention;

FIG5 is a schematic diagram of the connection between the cylindrical actuator and the slider of the present invention;

Fig. 6 is a schematic diagram of the installation position of the spring of the present invention;

FIG7 is a schematic diagram of the installation position of the rack of the present invention;

FIG8 is a schematic diagram of the meshing of a gear and a rack according to the present invention;

Fig. 9 is a schematic diagram of the upper and lower inflatable floats of the present invention;

FIG10 is a schematic diagram of the installation position of the rotating buckle and the rotating groove of the present invention;

FIG11 is a schematic diagram of the installation position of the damping plate of the present invention;

Fig. 12 is a schematic diagram of the present invention under the action of ocean current;

FIG13 is a schematic diagram of a cylindrical acting body of the present invention under the action of alternating vortices;

FIG14 is a schematic diagram of a cylindrical acting body of the present invention moving left and right under the action of alternating vortices;

Fig. 15 is a schematic diagram of the cylindrical acting body of the present invention moving to the left;

FIG16 is a schematic diagram of the present invention being grafted to a buoy cable at any depth;

In the attached figure: 1. upper base; 2. lower base; 3. bracket; 4. guide rail connecting plate 5. guide rail; 6. cylindrical actuator; 7. upper slider; 8. lower slider; 9. generator; 10. shaft seal; 11. gear; 12. rack; 13. spring 14. upper inflatable float; 15. upper damping plate; 16. upper wake plate; 17. lower inflatable float; 18. lower damping plate; 19. lower wake plate; 20. turn buckle; 21. turn slot.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

A vortex-induced vibration power generation device in an underwater suspended state, the overall schematic diagram of the device is shown in FIG1, and the schematic diagrams of the installation positions and connection methods of the various components of the device are shown in FIG2, FIG3, FIG4, FIG5, FIG6, FIG7, FIG8, FIG9, FIG10 and FIG11. The device includes: an upper base 1, a lower base 2, a bracket 3, a guide rail connecting plate 4, a guide rail 5, a cylindrical acting body 6, an upper slider 7, a lower slider 8, a generator 9, a shaft seal 10, a gear 11, a rack 12, a spring 13, an upper inflatable float 14, an upper damping plate 15, an upper wake plate 16, a lower inflatable float 17, a lower damping plate 18, a lower wake plate 19, a turn buckle 20 and a turn slot 21.

The frame of the device is composed of an upper base 1 and a lower base 2 connected by three groups of brackets, as shown in Figure 2, the upper base 1 and the lower base 2 are both cylinders with a certain thickness, the thickness of the upper base 1 is greater than the thickness of the lower base 2, and the diameters of the upper and lower bases are equal and coaxial; there are three groups of brackets 3, all of which are round rods made of lightweight materials. The three groups of brackets are evenly distributed between the upper and lower bases and are tangent to the outer edges of the bases.

As shown in Figure 3, there are four guide rail connecting plates 4, two of which are relatively installed at the lower plane edge of the upper base 1, and the other two guide rail connecting plates are relatively installed at the upper plane edge of the lower base 2; the guide rail 5 is a cylindrical rod, and there are two of them, one is fixed between the two guide rail connecting plates of the upper base 1, and the other is fixed between the two guide rail connecting plates of the lower base 2.

As shown in FIG4 , the generator 9 is installed inside the upper base 1. A through hole is preset at the bottom of the upper base 1 so that the output shaft of the generator 9 can just pass through. A gear 11 is installed on the output shaft of the generator 9. The shaft seal 10 is arranged at the preset through hole of the upper base 1 to prevent seawater from entering the interior of the upper base 1 through the through hole.

As shown in FIG5 , the cylindrical body 6 is a cylindrical body made of a light material with the same density as seawater; the upper slider 7 is a rectangular block structure, and a through hole with the same diameter as the guide rail 5 is opened on the upper slider 7, and the upper slider 7 is fixed to the upper bottom surface of the cylindrical body 6; the lower slider 8 is the same as the upper slider 7 and is fixed to the lower bottom surface of the cylindrical body 6. During installation, the guide rail 5 fixed to the upper base 1 is passed through the through hole of the upper slider 7, and the guide rail 5 fixed to the lower base 2 is passed through the through hole of the lower slider 8, so that the cylindrical body 6 can move back and forth along the guide rail 5.

As shown in FIG6 , the spring 13 is used to connect the slider and the guide rail connecting plate 4. The upper slider 7 needs two springs to be connected to the two guide rail connecting plates of the upper base 1, and the lower slider 8 needs two springs to be connected to the two guide rail connecting plates of the lower base 2. The purpose of setting the spring 13 is to prevent the upper and lower sliders from colliding with the guide rail connecting plate 4 during movement. As shown in FIG7 and FIG8 , the rack 12 is installed on the upper bottom surface of the cylindrical actuator 6. The module and pressure angle of the rack 12 are the same as those of the gear 11, and the rack 12 is meshed with the gear 11 when it is installed.

As shown in Figures 9 and 10, the upper inflatable float 14 is arranged on the upper plane of the upper base 1, and the top surface of the upper inflatable float 14 is made into an inclined surface with an inclination degree between 2° and 5°; the lower inflatable float 17 is arranged on the lower plane of the lower base 2, and the bottom surface of the lower inflatable float 17 is made into an inclined surface with an inclination degree between 2° and 5°; the top surface of the upper inflatable float 14 is kept parallel to the bottom surface of the lower inflatable float 17, and a turn buckle 20 is fixed on the top surface of the upper inflatable float 14 and the bottom surface of the lower inflatable float 17 respectively; the turning groove 21 is respectively arranged at the bottom end of the upper cable and the top end of the lower cable, and the turn buckle 20 in the upper inflatable float 14 cooperates with the turning groove 21 in the upper cable to realize mutual rotation. Similarly, the turn buckle 20 in the lower inflatable float 17 and the turning groove 21 in the lower cable can also rotate with each other. When designing the top surface of the upper inflatable float 14 and the bottom surface of the lower inflatable float 17, it should be ensured that the upper cable and the lower cable remain in the same straight line when tensioned. The upper inflatable float 14 and the lower inflatable float 17 are filled with air, and the gas volume in the upper inflatable float 14 is greater than the gas volume in the lower inflatable float 17. In this way, when the device is suspended in the water, the upper inflatable float 14 and the lower inflatable float 17 will have a buoyancy difference, and the upper inflatable float 14 is always at the top and the lower inflatable float 17 is always at the bottom, so as to avoid the device from tilting too much when the tension of the upper cable of the upper inflatable float 14 is too small, resulting in a poor effect of the device recovering the ocean current energy. When designing the float, it is also necessary to ensure that the total buoyancy generated by the upper and lower inflatable floats is greater than the gravity of the device, so that the device is always in a suspended state underwater.

As shown in FIG11 , the upper wake plate 16 is rigidly welded to the upper base 1 through a connecting rod; the lower wake plate 19 is rigidly welded to the lower base 2 through a connecting rod. The wake plate is used to capture the direction of the water flow. When the direction of the water flow is at an angle to the wake plate, the wake plate will be pushed to rotate the device so that the wake plate is parallel to the direction of the water flow. During the rotation of the device, the turn buckles 20 on the upper and lower inflatable floats rotate relative to the turn slots 21 on the cables, which prevents the cables from being damaged due to excessive twisting.

The upper damping plate 15 is arranged in the middle of the upper plane of the upper base 1, and is cleverly combined with the upper inflatable float 14 at the beginning of the structural design; the lower damping plate 18 is arranged in the middle of the lower plane of the lower base 2, and is cleverly combined with the lower inflatable float 17 at the beginning of the structural design. The purpose of setting the damping plate is as follows: first, the damping plate increases the resistance of the device frame to the left and right movement during the left and right movement of the cylindrical acting body 6, and avoids the cylindrical acting body 6 from driving the frame to move in the same direction during the movement, resulting in a reduction in the actual displacement of the cylindrical acting body 6, resulting in a worse power generation effect of the device; second, when the ocean current flows through the device, the damping plate can guide the ocean current, increase the oscillation amplitude of the cylindrical acting body 6, and thus improve the efficiency of the device in utilizing the ocean current energy.

As shown in FIG12, when a current flows through the device, the submerged buoy and the device buoy will move along the current direction. Under the restraint of the underwater anchor body, the upper cable connected to the device and the lower cable will tilt. According to experience, the cable inclination angle is about 2° to 5°, which is the same as the inclination degree of the top surface of the upper inflatable float 14 and the bottom surface of the lower inflatable float 17. Therefore, the cylindrical acting body 6 is almost perpendicular to the sea level, thereby ensuring that the cylindrical acting body 6 always has the maximum oscillation amplitude, and the device has a high utilization rate of current energy. As shown in FIG13, the current will produce a vortex-induced vibration effect on the cylindrical acting body 6, and alternating vortices will appear on both sides of the cylindrical acting body 6, thereby causing the cylindrical acting body 6 to move back and forth along the guide rail 5, so that the rack 12 and the gear 11 are meshed and transmitted, and then electricity is generated through the generator 9; if the current direction has an angle with the device wake board, the wake board is driven to rotate under the action of the current, thereby causing the device to rotate, and the wake board stops rotating when it rotates to be parallel to the current direction. During the rotation of the device, the turning buckles 20 on the upper and lower inflatable floats of the device rotate relative to the turning grooves 21 on the cables, thereby achieving optimal utilization of the ocean current energy by the device.

As shown in Figures 14 and 15, when the cylindrical body 6 moves to the left under the action of vortex-induced vibration, the cylindrical body 6 drives the rack 12 to move to the left, so that the rack 12 is meshed with the gear 11 for transmission, and then the generator 9 generates electricity. In the process of the cylindrical body 6 moving to the left, the left spring is compressed and the right spring is stretched. Similarly, when the cylindrical body 6 moves to the left under the action of vortex-induced vibration, the cylindrical body 6 drives the rack 12 to move to the left, so that the rack 12 is meshed with the gear 11 for transmission, and then the generator 9 generates electricity. In the process of the cylindrical body 6 moving to the left, the left spring is compressed and the right spring is stretched.

Since the vortex-induced vibration effect produces alternating vortices, the cylindrical actuator 6 will move back and forth under the action of the alternating vortices, thereby driving the rack 12 and the gear 11 to mesh and transmit back and forth, so that the generator 9 produces a stable power output, and the generated electrical energy can be directly transmitted to the submerged buoy.

The marine buoy is connected to the underwater anchor body by a cable. Usually, many devices for detecting water temperature, water pressure and water quality are installed at different water depths on the cable. Since the total length of the cable can reach hundreds of meters or even thousands of meters, and these devices are not concentrated on the cable and are often spaced far apart, the traditional buoy equipment only uses its own battery to power these carrying devices. It not only has to overcome the problem that the transmission cable is too long and difficult to arrange, but also faces the problem of buoy recovery after the battery power is exhausted. Based on this, as shown in Figure 16, this device can be grafted at any depth position of the buoy cable, or a group of devices can be grafted at different depths such as A, B, C or D. The generated power is transmitted to the equipment installed on the nearby cable, ensuring that the buoy has power for long-term operation, and solving the problem that the traditional buoy cable is too long and difficult to arrange. This method of suspending the device in the water has lower pressure resistance requirements for the device. In addition, the power generated by the device can also be stored to power passing submersibles or underwater vehicles.

The above is only a preferred implementation mode of the present invention, but it is not limited to the above embodiments when it is implemented. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims (6)

1. A vortex-induced vibration power generation device in an underwater suspension state, characterized in that: the power generation device is connected to a marine buoy through an upper cable and connected to an underwater anchor body through a lower cable, and the device comprises: an upper base (1), a lower base (2), a bracket (3), a guide rail connecting plate (4), a guide rail (5), a cylindrical actuator (6), an upper slider (7), a lower slider (8), a generator (9), a shaft seal (10), a gear (11), a rack (12), a spring (13), an upper inflatable float (14), an upper damping plate (15), an upper wake plate (16), a lower inflatable float (17), a lower damping plate (18), a lower wake plate (19), a turn buckle (20) and a turn slot (21), The frame of the device is composed of an upper base (1) and a lower base (2) connected by three sets of brackets; The guide rail connecting plate (4) is fixed to the upper base (1) and the lower base (2) respectively; Both ends of the guide rail (5) are connected to the guide rail connecting plates (4); The upper slider (7) and the lower slider (8) are respectively fixed on the upper bottom surface and the lower bottom surface of the cylindrical actuator (6), and the upper slider (7) and the lower slider (8) are respectively slidably matched with the guide rail (5); The spring (13) is used to connect the slider and the guide rail connecting plate (4). The upper slider (7) needs two springs to be connected to the two guide rail connecting plates of the upper base (1) respectively, and the lower slider (8) needs two springs to be connected to the two guide rail connecting plates of the lower base (2) respectively. The rack (12) is fixed on the upper bottom surface of the cylindrical actuator (6); The generator (9) is installed inside the upper base (1), a through hole is preset at the bottom of the upper base (1), the shaft seal (10) is arranged at the preset through hole of the upper base (1), the output shaft of the generator (9) just passes through the preset through hole, the output shaft of the generator (9) is connected to a gear (11), and the gear (11) is meshed with a rack (12); The upper inflatable float (14) is arranged on the upper plane of the upper base (1), and the top surface of the upper inflatable float (14) is made into an inclined surface with an inclination degree between 2° and 5°; the lower inflatable float (17) is arranged on the lower plane of the lower base (2), and the bottom surface of the lower inflatable float (17) is made into an inclined surface with an inclination degree between 2° and 5°; the top surface of the upper inflatable float (14) and the bottom surface of the lower inflatable float (17) are kept parallel; The rotating buckle (20) is respectively arranged on the top surface of the upper inflatable floating body (14) and the bottom surface of the lower inflatable floating body (17), and the rotating groove (21) is respectively arranged on the upper cable and the lower cable, and the rotating buckle (20) and the rotating groove (21) can realize rotational matching; The upper wake plate (16) is rigidly welded to the upper base (1) via a long rod; the lower wake plate (19) is rigidly welded to the lower base (2) via a long rod; The upper damping plate (15) is arranged at a middle position of an upper plane of the upper base (1), and the lower damping plate (18) is arranged at a middle position of a lower plane of the lower base (2). 2. According to claim 1, a vortex-induced vibration power generation device in an underwater suspended state is characterized in that: there are four guide rail connecting plates (4), two of which are relatively installed at the lower plane edge of the upper base (1), and the other two guide rail connecting plates are relatively installed at the upper plane edge of the lower base (2); the guide rail (5) is a cylindrical rod, there are two of them, one is fixed between the two guide rail connecting plates of the upper base (1), and the other is fixed between the two guide rail connecting plates of the lower base (2). 3. According to claim 1, a vortex-induced vibration power generation device in an underwater suspended state is characterized in that: the upper inflatable float (14) and the lower inflatable float (17) are filled with air, and the buoyancy generated by the upper inflatable float (14) and the lower inflatable float (17) is greater than the gravity of the device underwater. 4. According to claim 1, a vortex-induced vibration power generation device in an underwater suspended state is characterized in that: the diameters of the upper base (1) and the lower base (2) are equal and coaxial, and the upper base (1) and the lower base (2) are connected by three groups of evenly arranged brackets. 5. The vortex-induced vibration power generation device in an underwater suspension state according to claim 1 is characterized in that the cylindrical acting body (6) is a cylinder made of a lightweight material with the same density as seawater. 6. A vortex-induced vibration power generation device in an underwater suspended state according to claim 1, characterized in that the plate surfaces of the upper damping plate (15), the lower damping plate (18), the upper wake plate (16) and the lower wake plate (19) are all on the same plane.