Low-flow-velocity ocean current energy piezoelectric and electromagnetic composite power generation device

Abstract

The invention discloses a low-flow-velocity ocean current energy piezoelectric and electromagnetic composite power generation device which comprises a support, a driving plate, a liquid barrel and a transduction barrel, the support is fixedly installed on the side, away from the ocean current impact direction, of the seabed, the transduction barrel is connected to the support, and a piezoelectric film is sealed at an end opening of the transduction barrel; the liquid barrel is coaxially connected to the side, away from the support, of the transduction barrel, the piezoelectric film is located between the transduction barrel and the liquid barrel, built-in liquid is injected into a liquid cavity in the liquid barrel, and the driving plate is coaxially and slidably connected with a synchronous rod on the side, away from the support, of the liquid barrel. One end of the synchronous rod is arranged in the liquid cavity and coaxially connected with the liquid driving plate, and the other end is integrally connected with the driving plate; when the driving plate is impacted by ocean current, the liquid driving plate is driven by the synchronizing rod to push the built-in liquid, so that the built-in liquid impacts the piezoelectric film; the device can adapt to low-flow-speed ocean currents and sea area environments with algae, can greatly improve the conversion rate from ocean current energy to electric energy, and does not threaten marine organisms.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy development, and more specifically, it is a low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device. Background Art

[0002] As a renewable energy source, ocean current energy has the characteristics of being clean and having a high energy density, and has good development potential. Existing ocean current energy is mainly generated by vane-type ocean current energy power generation devices. However, vane-type ocean current energy power generation devices require relatively stable ocean currents with relatively high flow rates in the sea area due to their specific mechanical transmission requirements, and have a low utilization rate of ocean current energy. They are not suitable for sea areas with algae, and there is a risk of strangling marine organisms during the rotation of the vanes. Summary of the Invention

[0003] Object of the Invention: In order to overcome the deficiencies in the prior art, the present invention provides a low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device, which can not only convert the kinetic energy of low-flow ocean currents into the impact force of the internal liquid on the piezoelectric film, so as to adapt to the low-flow ocean current environment; but also can greatly improve the conversion rate of ocean current energy into electrical energy, and can resist the risk of transverse stress caused by changes in the ocean current direction, and does not pose a threat to marine organisms, and can well protect the ecological environment of the working sea area.

[0004] Technical Solution: To achieve the above object, a low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device of the present invention includes a bracket, a driving plate, a liquid barrel and a transducer barrel. The bracket is fixedly installed on one side of the seabed away from the direction of ocean current impact. The bottom end of the transducer barrel is connected to the bracket. A piezoelectric film is hermetically arranged at the port of the transducer barrel. The liquid barrel is coaxially connected to the side of the transducer barrel away from the bracket. The piezoelectric film is between the transducer barrel and the liquid barrel. An internal liquid is injected into the closed liquid cavity inside the liquid barrel. The driving plate is located on the side of the liquid barrel away from the bracket. A synchronous rod is hermetically slidably connected coaxially on the side of the liquid barrel away from the bracket. One end of the synchronous rod is located inside the liquid cavity and is coaxially connected to a liquid driving plate, and the other end is integrally connected to the driving plate. When the side of the driving plate away from the bracket is impacted by the ocean current, the liquid driving plate pushes the internal liquid under the drive of the synchronous rod, so that the internal liquid impacts the piezoelectric film.

[0005] Furthermore, it further includes a motor and a generator. The motor and the generator are installed on the side of the bracket away from the transducer barrel, and the motor is electrically connected to the transducer barrel through a wire. A driving pulley is coaxially arranged on the rotating shaft of the motor, and a driven pulley is coaxially arranged on the rotating shaft of the generator. The driving pulley is synchronously connected to the driven pulley through a synchronous belt.

[0006] Further, it further includes a guiding slide rail, the guiding slide rail is located below the transducer barrel, the liquid barrel and the synchronous rod along the axial direction of the transducer barrel, and one end of the guiding slide rail is fixedly connected to the bracket. One end of the synchronous rod close to the driving plate is vertically connected with a connecting rod, and one end of the connecting rod far away from the synchronous rod is integrally connected with a second slider. The second slider is slidably fitted in the guiding chute of the guiding slide rail, and the sliding fit between the second slider and the guiding slide rail can guide the relative sliding between the synchronous rod and the liquid barrel.

[0007] Further, a guiding rod is arranged in the guiding chute of the guiding slide rail, a guiding hole matched with the guiding rod is formed in the second slider, a return spring is sleeved outside the guiding rod, and one end of the return spring is connected to the bracket and the other end is connected to the second slider. When the driving plate is impacted by ocean currents, the return spring can make the second slider have a tendency to move away from the bracket.

[0008] Further, the piezoelectric film includes an elastic sealing rubber layer and a piezoelectric layer. An enclosed piezoelectric space is formed inside the two overlapped sealing rubber layers, and the piezoelectric layer is in the piezoelectric space. One end of the wire passes through the sealing rubber layer and is hermetically electrically connected to the piezoelectric layer, and the sealing rubber layer can form a sealing protective layer on the surface of the piezoelectric layer.

[0009] Further, a spiral coil and a U-shaped magnet are also arranged in the transducer barrel. The two coil heads of the spiral coil are located at the same end of the coil. A magnet installation groove is formed at the bottom of the transducer barrel, and the magnet is fixedly installed in the magnet installation groove. The two magnetic pole ends of the magnet face the piezoelectric film at the port of the transducer barrel. The two coils are respectively sleeved outside the two magnetic pole ends of the magnet, and the coils are fixedly connected to the side of the piezoelectric film close to the transducer barrel. The elastic deformation of the piezoelectric film can make the two coils move relative to the two magnetic pole ends of the magnet.

[0010] Further, a conductive layer is also arranged on the side of the piezoelectric film close to the transducer barrel. Embedded wires are arranged in the conductive layer. The two coil heads of the two coils are fixedly connected to the conductive layer and are electrically connected to the embedded wires. One end of the wire electrically connected to the piezoelectric layer is electrically connected to the coil through the embedded circuit in the conductive layer.

[0011] Further, the diameter of the liquid driving plate is smaller than the diameter of the inner wall of the liquid cavity, and an annular internal liquid flow through gap is formed between the liquid driving plate and the liquid cavity. The internal liquid can flow from the side of the liquid driving plate close to the bracket to the side of the liquid driving plate far away from the bracket through the internal liquid flow through gap.

[0012] Further, a guiding and limiting cylinder is integrally and hermetically arranged coaxially at one end of the liquid barrel close to the driving plate. The inner diameter of the guiding and limiting cylinder is equal to the rod diameter of the synchronous rod. The synchronous rod is hermetically and coaxially slidably fitted in the guiding and limiting cylinder. One end of the guiding and limiting cylinder close to the driving plate is in limiting contact with the connecting rod, so that the synchronous rod can no longer move relative to the liquid barrel in the direction close to the bracket. Moreover, the guiding and limiting cylinder can guide the sliding of the synchronous rod relative to the liquid barrel.

[0013] Further, it further includes an adjusting plate. The liquid barrel and the transducer barrel are both connected to the bracket through the adjusting plate. One end of each adjusting plate is provided with an annular buckle. A first locking member is arranged at one end of the buckle away from the adjusting plate. When the buckles on the two adjusting plates are respectively sleeved on the circumferences of the liquid barrel and the transducer barrel, the two first locking members can lock the liquid barrel and the transducer barrel on the two adjusting plates respectively.

[0014] Further, the bracket includes a bottom plate and side plates. The two side plates are integrally connected to both sides of the bottom plate, and the two side plates are perpendicular to the bottom plate. A first adjusting groove is opened at the center of the bottom plate. A first slider is integrally connected to one end of the transducer barrel close to the bracket. The transducer barrel is slidably fitted in the first adjusting groove through the first slider. Sliding grooves are opened on the corresponding side plates for the adjusting plates. One end of each adjusting plate away from the buckle is slidably fitted in the sliding groove. A second adjusting groove is opened on each adjusting plate. A second fastener is slidably fitted in the second adjusting groove. The second fastener can lock the two adjusting plates on the same side plate on the side plate.

[0015] Further, the power generation principle of a low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device: When the driving plate is impacted by the ocean current, the driving plate moves in the direction close to the bracket under the action of the ocean current. The synchronous rod slides relative to the liquid barrel in the direction close to the bracket under the action of the driving plate. The second slider moves in the direction close to the bracket relative to the guiding slide rail under the action of the connecting rod and compresses the return spring until the force of the return spring on the second slider is equal to the force of the ocean current on the driving plate. During this process, the liquid driving plate connected to one end of the synchronous rod in the liquid barrel pushes the internal liquid under the action of the synchronous rod, so that the internal liquid surges along the axis of the liquid barrel and impacts the piezoelectric film. After being impacted, the piezoelectric film bends and deforms and generates an instantaneous current. During the bending deformation process of the piezoelectric film, the coil in the transducer barrel moves relative to the two magnetic pole ends of the magnet along the length direction of the two magnetic pole ends of the magnet under the drive of the piezoelectric film, so that the coil cuts the magnetic induction lines of the magnet and generates an instantaneous current. The instantaneous currents generated in the piezoelectric film and the coil are conducted to the motor through wires and drive the driving pulley to rotate. The driven pulley rotates together with the driving pulley under the drive of the synchronous belt, so that the generator transmits stable current to the power station through the submarine cable.

[0016] Beneficial effects: A low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device of the present invention combines mechanical transmission of a driving plate and surging of an internal liquid fluid, converting the kinetic energy of low-flow ocean currents into the impact force of the internal liquid on a piezoelectric film, and can adapt to low-flow ocean current environments. By adopting a dual power generation mechanism of piezoelectric effect and electromagnetic induction, the conversion rate of ocean current energy into electrical energy can be greatly improved. Through a guiding slide rail and a limiting mechanism, the axial movement accuracy of a synchronous rod is ensured, and the risk of lateral stress caused by changes in the ocean current direction is reduced. The modular design of the power generation component can match different power generation requirements, and the installation and maintenance costs are relatively low. During operation, it poses no threat to marine organisms and can well protect the ecological environment of the working sea area. Description of the drawings

[0017] Figure 1 It is a schematic structural diagram of a low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device of the present invention;

[0018] Figure 2 It is a top view of a low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device of the present invention;

[0019] Figure 3 It is a sectional view taken along line A;

[0020] Figure 4 It is a sectional view taken along line B;

[0021] Figure 5 It is a schematic structural diagram of a guiding slide rail;

[0022] Figure 6 It is a schematic structural diagram of a bracket;

[0023] Figure 7 It is a schematic structural diagram of a piezoelectric film;

[0024] Figure 8 It is a partial enlarged view C;

[0025] Figure 9 It is a schematic structural diagram of a coil. Detailed implementation manners

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] As shown in the attached Figures 1 to 4As shown in the figure, a low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device includes a support 1, a driving plate 2, a liquid barrel 3 and a transducer barrel 4. The support 1 is fixedly installed on one side of the seabed away from the direction of ocean current impact. The bottom end of the transducer barrel 4 is connected to the support 1. A piezoelectric film 5 is hermetically arranged at the port of the transducer barrel 4. The piezoelectric film 5 is a polyvinylidene fluoride piezoelectric film, which is a film material with piezoelectric effect and good elasticity at the same time. The liquid barrel 3 is coaxially connected to the side of the transducer barrel 4 away from the support 1. The piezoelectric film 5 is between the transducer barrel 4 and the liquid barrel 3. An internal liquid is injected into the closed liquid chamber 34 inside the liquid barrel 3. The volume of the internal liquid is less than the volume of the liquid chamber 34, that is, the internal liquid does not fill the liquid chamber 34. The driving plate 2 is located on the side of the liquid barrel 3 away from the support 1. The side of the driving plate 2 away from the support 1 is the stress surface, and the stress surface faces the direction of ocean current impact. A synchronous rod 6 is hermetically and slidably connected coaxially to the side of the liquid barrel 3 away from the support 1. One end of the synchronous rod 6 is located inside the liquid chamber 34 and is coaxially connected to a liquid driving plate 35, and the other end is integrally connected to the driving plate 2. The diameter of the liquid driving plate 35 is smaller than the diameter of the inner wall of the liquid chamber 34, and an annular internal liquid flow gap is formed between the liquid driving plate 35 and the liquid chamber 34. When the driving plate 2 is impacted by the ocean current, the synchronous rod 6 and the driving plate 2 move relative to the liquid barrel 3 in the direction close to the support 1 at the same time. During this process, the liquid driving plate 35 and the synchronous rod 6 inside the liquid barrel 3 move synchronously, and the liquid driving plate 35 drives the internal liquid under the drive of the synchronous rod 6, so that the internal liquid surges along the axis of the liquid barrel 3 and impacts the piezoelectric film 5. After being impacted by the internal liquid, the piezoelectric film 5 undergoes elastic deformation and generates an instantaneous current.

[0028] Since there is an annular internal liquid flow gap between the liquid driving plate 35 and the liquid chamber 34, the internal liquid can flow from the side of the liquid driving plate 35 close to the support 1 to the side away from the support 1 through the internal liquid flow gap. Therefore, no matter where the liquid driving plate 35 is located in the liquid chamber 34, the pressure in the liquid chamber 34 on both sides of the liquid driving plate 35 is always the same and will not change due to the movement of the liquid driving plate 35 relative to the liquid barrel 3. And because the internal liquid is injected into the liquid chamber 34 and the volume of the internal liquid is less than the volume of the liquid chamber 34, after being pushed by the liquid driving plate 35, the internal liquid will surge repeatedly in the closed liquid chamber 34 under the action of inertia and impact the piezoelectric film 5 repeatedly. Each impact of the internal liquid on the piezoelectric film 5 can cause the piezoelectric film 5 to generate an instantaneous current.

[0029] The liquid barrel 3, the transducer barrel 4, the piezoelectric film 5, the synchronous rod 6, and the liquid driving plate 35 can be regarded as a set of power generation components, so that the power generation components in the present invention are modularly designed. Therefore, several sets of power generation components can be arranged in parallel on the bracket 1 according to the designed power generation demand and the power generation efficiency of a single power generation component. During the assembly process, the transducer barrels 4 in each power generation component are simultaneously connected to the bracket 1, and the synchronous rods 6 are simultaneously connected to the driving plate 2, so that the driving plate 2 can simultaneously drive the synchronous rods 6 in each power generation component to slide synchronously relative to their corresponding liquid barrels 3.

[0030] Since the current generated by the piezoelectric film 5 is an instantaneous current, it can only be transmitted in and out over a short distance and is not easy to store. Therefore, it is necessary to convert the instantaneous current generated by the piezoelectric film 5 into a continuously output stable current through a suitable method. In this solution, a motor 14 and a generator 15 are also included. The motor 14 and the generator 15 are installed on the side of the bracket 1 away from the transducer barrel 4. The motor 14 is electrically connected to the transducer barrel 4 through a wire 16. A wire through hole 26 is provided on the bracket 1 corresponding to the wire 16. One end of the wire 16 is sealingly and electrically connected to the input end that drives the rotation of the shaft of the motor 14, and the other end is sealingly and electrically connected to the output end of the piezoelectric film 5. A driving pulley 28 is coaxially arranged on the shaft of the motor 14, and a driven pulley 29 is coaxially arranged on the shaft of the generator 15. The driving pulley 28 is synchronously connected to the driven pulley 29 through a synchronous belt 27. When installing the motor 14 and the generator 15, the axis of the shaft of the motor 14 and the axis of the shaft of the generator should be in the same horizontal plane to ensure the stability of the belt drive between the driving pulley 28 and the driven pulley 29.

[0031] Since the characteristic of ocean current flow is that its flow velocity varies dynamically within a specific range under the influence of various factors, the impact force of the ocean current on the driving plate 2 changes constantly. Since the liquid in the liquid barrel 3 drives the driving plate 2 to move synchronously through the synchronous rod 6, when the impact force on the driving plate 2 changes constantly, the impact force of the built-in liquid in the liquid barrel 3 on the piezoelectric film 5 under the push of the liquid driving plate 2 also changes constantly. The piezoelectric film 5 generates an instantaneous current only when it is externally impacted and deformed, and the built-in liquid in the liquid barrel 3 can only intermittently impact the piezoelectric film 5. Therefore, the current transmitted by the energy conversion barrel 4 to the motor 14 through the wire 16 is an instantaneous current, and the magnitude of the instantaneous current also changes constantly, rather than a stable current. Therefore, if the wire 16 is directly connected to the generator 15, the rotational speed of the shaft of the generator 15 will change constantly, resulting in the current transmitted by the generator 15 to the power station through the submarine cable being fluctuating rather than a stable current. An unstable current is not conducive to the transmission and storage of electricity. Therefore, it is necessary to use the motor 14 as a conversion device to convert the unstable instantaneous current transmitted by the energy conversion barrel 4 into stable mechanical energy, and drive the shaft of the generator 15 to rotate through the stable mechanical energy, so that the generator 15 can transmit a stable current to the power station through the submarine cable.

[0032] To make the rotational speed of the generator 15 more stable, the diameter of the driving pulley 28 should be much larger than the diameter of the driven pulley 29. Let the diameter of the driving pulley 28 be D1 and the diameter of the driven pulley 29 be D2. According to the belt drive relationship: n2 / n1 = D1 / D2 (n1 is the rotational speed of the driving wheel, n2 is the rotational speed of the driven wheel). Therefore, when D1 > D2, the rotational speed n2 of the driven pulley 29 > n1. Since the current transmitted by the energy conversion barrel 4 to the motor 14 through the wire 16 periodically and instantaneously is an instantaneous current, the rotation of the motor 14 is intermittent. By increasing the rotational speed n1 of the driven pulley, the rotational inertia of the shaft of the generator 15 can be amplified, enabling it to maintain a relatively stable rotation by inertia during the short pause of the motor 14, thereby generating a stable current. The motor 14 can be selected as a brushless DC motor, a permanent magnet synchronous motor, or other motors that can operate stably in an environment of periodic instantaneous current according to different requirements.

[0033] As Figure 1 and 5As shown, due to the relatively complex marine environment, although the force-receiving surface of the driving plate 2 faces the direction of the ocean current when installing the power generation device of the present invention, when the marine environment changes, the direction of the ocean current may deflect, resulting in an angle between the direction of the ocean current and the force-receiving surface of the driving plate 2, thus causing the synchronous rod 6 to be subjected to lateral offset stress, and there is a risk that core components such as the liquid barrel 3 and the transducer barrel 4 may deform or shift due to uneven force. Therefore, it is necessary to guide the sliding of the synchronous rod 6 relative to the liquid barrel 3. Therefore, the present invention further includes a guiding slide rail 10. The guiding slide rail 10 is located below the transducer barrel 4, the liquid barrel 3 and the synchronous rod 6 along the axial direction of the transducer barrel 4, and one end of the guiding slide rail 10 is fixedly connected to the bracket 1. One end of the synchronous rod 6 close to the driving plate 2 is vertically connected with a connecting rod 7, and the end of the connecting rod 7 far from the synchronous rod 6 is integrally connected with a second slider 8. The second slider 8 is slidably fitted in the guiding chute 11 of the guiding slide rail 10. Through the sliding fit between the guiding slide rail 10 and the second slider 8, the purpose that the synchronous rod 6 always slides relative to the liquid barrel 3 along the axial direction of the liquid barrel 3 can be achieved.

[0034] In order to further guide the sliding of the synchronization rod 6 relative to the liquid barrel 3 and prevent the liquid driving plate 35 of the synchronization rod 6 located inside the liquid barrel 3 from hitting the piezoelectric film 5 and causing damage to the piezoelectric film 5, a guiding and limiting cylinder 9 is integrally and sealingly arranged coaxially at one end of the liquid barrel 3 close to the driving plate 2. The inner diameter of the guiding and limiting cylinder 9 is equal to the rod diameter of the synchronization rod 6, and the synchronization rod 6 is slidably and coaxially fitted in the guiding and limiting cylinder 9 in a sealed manner. The guiding and limiting cylinder 9 can guide the sliding of the synchronization rod 6 relative to the liquid barrel 3, and further realize that the synchronization rod 6 always slides relative to the liquid barrel 3 along the axis direction of the liquid barrel 3. A sealing ring can be arranged at the port of the guiding and limiting cylinder 9 close to the driving plate 2. The sealing ring is closely attached to the circumferential surface of the synchronization rod 6. When the synchronization rod 6 slides relative to the liquid barrel 3, the sealing ring can prevent seawater from flowing into the liquid barrel 3. At the same time, a sealing ring can also be arranged at the joint of the liquid barrel 3 and the synchronization rod 6 to further enhance the sealing performance of the liquid barrel 3. During the process that the synchronization rod 6 always slides relative to the liquid barrel 3 along the axis direction of the liquid barrel 3, one end of the guiding and limiting cylinder 9 close to the driving plate 2 is in limit contact with the connecting rod 7, so that the synchronization rod 6 can no longer move relative to the liquid barrel 3 in the direction close to the bracket 1. Specifically, let the distance between one end of the guiding and limiting cylinder 9 close to the driving plate 2 and the driving plate 2 be L1, and the distance between the liquid driving plate 35 and the piezoelectric film 5 be L2. When assembling the power generation device of the present invention, it should be ensured that L1 < L2. Therefore, when the sea current velocity in the installation sea area suddenly increases due to extreme weather or other unexpected situations, the limiting effect of the guiding and limiting cylinder 9 on the connecting rod 7 can make the synchronization rod 6 no longer move relative to the liquid barrel 3 in the direction close to the bracket 1. And in the state where the guiding and limiting cylinder 9 is in limit contact with the connecting rod 7, there is still enough buffer distance between the liquid driving plate 35 and the piezoelectric film 5.

[0035] In order to enable the power generation device described in the present invention to continuously generate electricity, the driving plate 2 should be automatically reset when it is not affected by the ocean current impact or when the ocean current impact force decreases. Therefore, a guide rod 12 is provided in the guide chute 11 of the guide slide rail 10. A guide hole 36 matching the guide rod 12 is provided on the second slider 8. The cooperation between the guide rod 12 and the guide hole 36 can further realize that the synchronous rod 6 always slides relative to the liquid barrel 3 along the axis direction of the liquid barrel 3. A return spring 13 is sleeved around the outer periphery of the guide rod 12. The inner diameter of the return spring 13 is larger than the aperture of the guide hole 36. One end of the return spring 13 is connected to the bracket 1, and the other end is connected to the second slider 8. When the driving plate 2 is affected by the ocean current impact, the synchronous rod 6 slides relative to the liquid barrel 3 along its own axis in the direction close to the bracket 1. The second slider 8 slidably matched in the guide slide rail 10 moves synchronously with the synchronous rod 6 under the action of the connecting rod 7, that is, the second slider 8 slides in the guide chute 11 in the direction close to the bracket 1 relative to the guide slide rail 10 under the action of the connecting rod 7 and compresses the return spring 13 until the acting force of the return spring 13 on the second slider 8 is equal to the acting force of the ocean current on the driving plate 2. At this time, if the acting force of the ocean current on the driving plate 2 decreases or disappears, the acting force of the return spring 13 on the second slider 8 will drive the second slider 8, the connecting rod 7, the synchronous rod 6, the driving plate 2 and the liquid driving plate 35 to move synchronously along their respective movement paths in the direction away from the bracket 1 until the liquid driving plate 35 is in limit contact with the end of the liquid barrel 3 close to the driving plate 2.

[0036] It can be determined according to actual needs whether a sealing device needs to be provided outside the guide slide rail 10 to prevent impurities in the sea area from entering the guide slide rail 10 and having an adverse effect on the sliding fit between the second slider 8 and the guide slide rail 10. The sealing device can be a sealed corrugated tube sleeved outside the guide slide rail 10 or other sealing devices that can enable the connecting rod 7 and the second slider 8 to move synchronously under the premise of sealing.

[0037] Such as Figures 7 to 9As shown, the piezoelectric film 5 includes an elastic sealing rubber layer 37 and a piezoelectric layer 38. An enclosed piezoelectric space 43 is formed inside the superposed sealing rubber layer 37. The piezoelectric layer 38 is located in the piezoelectric space 43. One end of the wire 16 passes through the sealing rubber layer 37 and is hermetically electrically connected to the piezoelectric layer 38. Since one end of the wire 16 is electrically connected to the piezoelectric film 5 before the sealing rubber layer 37 is processed to the surface of the piezoelectric film 5, when the sealing rubber layer 37 is processed to the surface of the piezoelectric film 5 to form a sealing protective layer, the piezoelectric space 43 is an enclosed space, so that the sealing rubber layer 37 can prevent seawater from entering the piezoelectric space 43 and eroding the piezoelectric layer 38. In order to prevent the pressure in the inner cavity of the energy conversion barrel 4 from increasing due to space squeezing when the piezoelectric film 5 undergoes elastic deformation, thus hindering the deformation process of the piezoelectric film 5, the energy conversion barrel 4 can be connected to the external marine environment through a seawater purification device, and the pressure in the enclosed liquid cavity 34 in the liquid barrel 3 can be increased to be consistent with the seawater pressure in the installation area before assembly.

[0038] To further improve the power generation efficiency of the power generation device of the present invention, a spiral coil 32 and a U-shaped magnet 33 are further arranged in the energy conversion barrel 4. Both coil heads 41 of the spiral coil 32 are arranged at the end of one end of the coil. A magnet installation groove 42 is opened at the bottom of the energy conversion barrel 4, and the magnet 33 is fixedly installed in the magnet installation groove 42. When the magnet 33 is installed in the magnet installation groove 42, the two magnetic pole ends of the magnet 33 face the piezoelectric film 5 at the port of the energy conversion barrel 4. The two coils 32 are respectively sleeved outside the two magnetic pole ends of the magnet 33. One end where the two coil heads 41 of the coil 32 are located is fixedly connected to the side of the piezoelectric film 5 close to the energy conversion barrel 4. When the liquid driving plate 35 in the liquid barrel 3 pushes the internal liquid, the internal liquid impacts on the piezoelectric film 5, so that the piezoelectric film 5 undergoes elastic deformation. The elastic deformation of the piezoelectric film 5 can make the two coils 32 move relative to the two magnetic pole ends of the magnet 33. Since the magnetic induction lines in the magnetic field formed by the U-shaped magnet 33 are straight lines located between the two magnetic pole ends and directly point from one magnetic pole end to the other magnetic pole end, when the two coils 32 move relative to the two magnetic pole ends of the magnet 33, the two coils 32 simultaneously cut the magnetic induction lines of the magnet 33 and generate an instantaneous current. When the piezoelectric film 5 returns to its original state, the two coils 32 can also move relative to the two magnetic pole ends of the magnet 33 and cut the magnetic induction lines of the magnet 33 to generate an instantaneous current.

[0039] On one side of the piezoelectric film 5 close to the transducer barrel 4, a conductive layer 39 is further provided. An embedded wire 40 is arranged in the conductive layer 39. The two coil heads 41 of the two coils 32 are fixedly connected to the conductive layer 39 and are electrically connected to the embedded wire 40. One end of the wire 16 electrically connected to the piezoelectric layer 38 is electrically connected to the two coils 32 through the embedded circuit 40 in the conductive layer 39. When the two coils 32 move relative to the two magnetic pole ends of the magnet 33, the two coils 32 simultaneously cut the magnetic induction lines of the magnet 33 and generate an instantaneous current. The instantaneous current generated by the two coils 32 will be transmitted to the wire 16 through the embedded wire 40 and finally transmitted to the motor 14.

[0040] As Figure 1 shown, it further includes an adjusting plate 19. The liquid barrel 3 and the transducer barrel 4 are both connected to the bracket 1 through the adjusting plate 19. One end of each adjusting plate 19 is provided with an annular buckle 20. A first locking member 21 is arranged on the locking end of the buckle 20 away from the adjusting plate 19 with a gap. When the buckles 20 on the two adjusting plates 19 are respectively sleeved on the circumferences of the liquid barrel 3 and the transducer barrel 4, the two first locking members 21 can lock the liquid barrel 3 and the transducer barrel 4 on the two adjusting plates 19 respectively.

[0041] As Figure 6 shown, the bracket 1 includes a bottom plate 30 and side plates 31. The two side plates 31 are integrally connected to both sides of the bottom plate 30, and the two side plates 31 are perpendicular to the bottom plate 30. A first adjusting groove 17 is opened at the center of the bottom plate 30. The bottom end of the transducer barrel 4 is integrally connected with a first slider 18. The transducer barrel 4 is slidably fitted in the first adjusting groove 17 through the first slider 18. The first adjusting groove 17 is a sliding groove with a "T" - shaped cross - section, and the first slider 18 is a "T" - shaped slider with a cross - section adapted to the first adjusting groove 17. The first adjusting groove 17 and the first slider 18 arranged in this way can ensure the stability of the first slider 18 sliding relative to the first adjusting groove 17. A sliding groove 25 is opened on each side plate 31 corresponding to the adjusting plate 19. One end of each adjusting plate 19 away from the buckle 20 is slidably fitted in the sliding groove 25. A second adjusting groove 22 is opened on each adjusting plate 19. A second fastener 23 is slidably fitted in the second adjusting groove 22. The threaded fit of the bolt and nut of the second fastener 23 can lock the two adjusting plates 19 on the same side plate 31 to the side plate 31.

[0042] The energy of the ocean current is proportional to the square of the flow velocity and the flow rate, and the flow rate is the product of the flow velocity and the cross-sectional area. Therefore, the energy of the ocean current is proportional to the cube of the flow velocity and the cross-sectional area. In this solution, the cross-sectional area of the ocean current is the area of the driving plate 2. Since the flow velocity of the ocean current in the same sea area is almost constant, to improve the power generation efficiency of the power generation device, it is necessary to increase the area of the driving plate 2; when the area of the driving plate 2 increases, the axes of the liquid barrel 3 and the energy conversion barrel 4 can be adjusted to the optimal installation position directly facing the driving plate 2 through the sliding fit of the first adjustment groove 17 and the first slider 18, the sliding fit of the adjustment plate 19 and the sliding groove 25, and the sliding fit of the second adjustment groove 22 and the second fastener 23, so that the axis of the synchronous rod 6 is in the optimal installation position directly facing the driving plate 2, so that when the driving plate 2 is impacted by the ocean current, the driving plate 2 can stably drive the synchronous rod 6 to slide relative to the liquid barrel 3.

[0043] For the guiding slide rail 10, a number of mounting columns 24 are provided on one side of the bottom plate 30 and the side plate 31 close to the seabed. By changing the height of the mounting columns 24, the distance between the driving plate 2 and the seabed is changed, so that the stress surface of the driving plate 2 faces the area with the fastest ocean current flow velocity in the installation sea area.

[0044] Since the impact of the ocean current on the driving plate 2 is continuous, but the process of generating an instantaneous current in the piezoelectric film 5 and the coil 32 is the same every time the driving plate 2 is impacted by the ocean current, the following takes an independent impact process during the impact of the ocean current on the driving plate 2 as an example to introduce the power generation principle of a low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device of the present invention;

[0045] Principle of power generation of a low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device: When the driving plate 2 is impacted by the ocean current, the driving plate 2 moves towards the bracket 1 under the action of the ocean current. The synchronous rod 6 slides towards the bracket 1 relative to the liquid barrel 3 under the action of the driving plate 2. The second slider 8 moves towards the bracket 1 relative to the guiding slide rail 10 under the action of the connecting rod 7 and compresses the return spring 13 until the force exerted by the return spring 13 on the second slider 8 is equal to the force exerted by the ocean current on the driving plate 2. During this process, the liquid driving plate 35 connected to one end of the synchronous rod 6 located in the liquid barrel 3 pushes the internal liquid under the action of the synchronous rod 6, causing the internal liquid to surge axially along the liquid barrel 3 and impact the piezoelectric film 5. After being impacted, the piezoelectric film 5 bends and deforms, generating an instantaneous current. Since the internal liquid in the liquid barrel 3 will surge repeatedly in the closed liquid chamber 34 under the action of inertia after being pushed by the liquid driving plate 35 and impact the piezoelectric film 5 repeatedly, each impact of the internal liquid on the piezoelectric film 5 can cause the piezoelectric film 5 to generate an instantaneous current. During the bending deformation process of the piezoelectric film 5, the coil 32 in the energy conversion barrel 4 moves relative to the two magnetic pole tips of the magnet 33 along the length direction of the two magnetic pole tips of the magnet 33 under the drive of the piezoelectric film 5, causing the coil 32 to cut the magnetic induction lines of the magnet 33 and generating an instantaneous current. The instantaneous currents generated in the piezoelectric film 5 and the coil 32 are conducted to the motor 14 through the wire 16, driving the active pulley 28 to rotate. The driven pulley 29 rotates together with the active pulley 28 under the drive of the synchronous belt 27, so that the generator 15 transmits a stable current to the power station through the submarine cable;

[0046] When the force exerted by the ocean current on the driving plate 2 decreases or disappears, that is, when the force exerted by the return spring 13 on the second slider 8 is greater than the force exerted by the ocean current on the driving plate 2, the force exerted by the return spring 13 on the second slider 8 will drive the second slider 8 to move away from the bracket 1 along the length direction of the guiding slide rail 10. The synchronous rod 6 moves away from the bracket 1 synchronously with the second slider 8 along the axial direction of the liquid barrel 3 under the drive of the connecting rod 7. The driving plate 2 and the liquid driving plate 35 move away from the bracket 1 synchronously with the second slider 8 along the axial direction of the synchronous rod 6 under the action of the synchronous rod 6 until the liquid driving plate 35 is in limit contact with one end of the liquid barrel 3 close to the driving plate 2. During this process, the liquid driving plate 35 can also push the internal liquid in the liquid chamber 34, causing the internal liquid to surge axially along the liquid barrel 3 and impact the piezoelectric film 5. After being impacted, the piezoelectric film 5 bends and deforms, generating an instantaneous current. During the bending deformation process of the piezoelectric film 5, the coil 32 in the energy conversion barrel 4 moves relative to the two magnetic pole tips of the magnet 33 along the length direction of the two magnetic pole tips of the magnet 33 under the drive of the piezoelectric film 5, causing the coil 32 to cut the magnetic induction lines of the magnet 33 and generating an instantaneous current.

[0047] Therefore, for the low-flow ocean current energy piezoelectric and electromagnetic composite power generation device described in the present invention, every impact of the ocean current on the driving plate 2 can cause the piezoelectric film 5 and the coil 32 to generate instantaneous current multiple times, which can greatly improve the conversion rate of ocean current energy into electrical energy.

[0048] The above is the preferred embodiment described in the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A low-flow ocean current energy piezoelectric and electromagnetic composite power generation device, characterized in that: It includes a bracket (1), a drive plate (2), a liquid barrel (3) and a transducer barrel (4). The bracket (1) is fixedly installed on one side of the seabed away from the direction of ocean current impact. The bottom end of the transducer barrel (4) is connected to the bracket (1). A piezoelectric film (5) is hermetically arranged at the port of the transducer barrel (4). The liquid barrel (3) is coaxially connected to the side of the transducer barrel (4) away from the bracket (1). The piezoelectric film (5) is between the transducer barrel (4) and the liquid barrel (3). An internal liquid is injected into the closed liquid cavity (34) inside the liquid barrel (3). The drive plate (2) is located on the side of the liquid barrel (3) away from the bracket (1). A synchronous rod (6) is hermetically and slidably connected coaxially on the side of the liquid barrel (3) away from the bracket (1). One end of the synchronous rod (6) is located inside the liquid cavity (34) and is coaxially connected to a liquid drive plate (35), and the other end is integrally connected to the drive plate (2). When the side of the drive plate (2) away from the bracket (1) is impacted by the ocean current, the liquid drive plate (35) pushes the internal liquid under the drive of the synchronous rod (6), so that the internal liquid impacts the piezoelectric film (5).

2. The low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device according to claim 1, characterized in that: It further includes a motor (14) and a generator (15). The motor (14) and the generator (15) are installed on the side of the bracket (1) away from the transducer barrel (4). And the motor (14) is electrically connected to the transducer barrel (4) through a wire (16). A driving pulley (28) is coaxially arranged on the rotating shaft of the motor (14). A driven pulley (29) is coaxially arranged on the rotating shaft of the generator (15). The driving pulley (28) is synchronously connected to the driven pulley (29) through a synchronous belt (27).

3. The low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device according to claim 1, wherein: It further includes a guiding slide rail (10). The guiding slide rail (10) is below the transducer barrel (4), the liquid barrel (3) and the synchronous rod (6) along the axial direction of the transducer barrel (4). And one end of the guiding slide rail (10) is fixedly connected to the bracket (1). One end of the synchronous rod (6) close to the drive plate (2) is vertically connected to a connecting rod (7). One end of the connecting rod (7) away from the synchronous rod (6) is integrally connected to a second slider (8). The second slider (8) is slidably fitted in the guiding chute (11) of the guiding slide rail (10). The sliding fit between the second slider (8) and the guiding slide rail (10) can guide the relative sliding between the synchronous rod (6) and the liquid barrel (3).

4. A low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device according to claim 3, characterized in that: A guiding rod (12) is arranged in the guiding chute (11) of the guiding slide rail (10). A guiding hole (36) matched with the guiding rod (12) is formed on the second slider (8). A return spring (13) is sleeved on the periphery of the guiding rod (12). And one end of the return spring (13) is connected to the bracket (1), and the other end is connected to the second slider (8). When the drive plate (2) is impacted by the ocean current, the return spring (13) can make the second slider (8) tend to move away from the bracket (1).

5. The piezoelectric and electromagnetic hybrid power generation device for low-flow ocean current energy according to claim 1, characterized in that: The piezoelectric film (5) includes an elastic sealing rubber layer (37) and a piezoelectric layer (38). A sealed piezoelectric space (43) is formed inside the superposed sealing rubber layer (37). The piezoelectric layer (38) is located in the piezoelectric space (43). One end of the wire (16) passes through the sealing rubber layer (37) and is hermetically electrically connected to the piezoelectric layer (38). The sealing rubber layer (37) can form a sealing protective layer on the surface of the piezoelectric layer (38).

6. The low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device according to claim 1, characterized in that: A spiral coil (32) and a U-shaped magnet (33) are further arranged inside the transducer barrel (4). Two coil heads (41) of the spiral coil (32) are located at the same end of the coil (32). A magnet mounting groove (42) is formed at the bottom of the transducer barrel (4). The magnet (33) is fixedly installed in the magnet mounting groove (42). Two magnetic pole ends of the magnet (33) face the piezoelectric film (5) at the port of the transducer barrel (4). The two coils (32) are respectively sleeved outside the two magnetic pole ends of the magnet (33). The coil (32) is fixedly connected to one side of the piezoelectric film (5) close to the transducer barrel (4). The elastic deformation of the piezoelectric film (5) can make the two coils (32) move relative to the two magnetic pole ends of the magnet (33).

7. A low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device according to claim 5, characterized in that: A conductive layer (39) is further arranged on one side of the piezoelectric film (5) close to the transducer barrel (4). An embedded wire (40) is arranged inside the conductive layer (39). The two coil heads (41) of the two coils (32) are fixedly connected to the conductive layer (39) and are electrically connected to the embedded wire (40). One end of the wire (16) electrically connected to the piezoelectric layer (38) is electrically connected to the coil (32) through the embedded circuit (40) inside the conductive layer (39).

8. A low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device according to claim 1, characterized in that: The diameter of the liquid driving plate (35) is smaller than the diameter of the inner wall of the liquid chamber (34), and an annular internal liquid flow gap is formed between the liquid driving plate (35) and the liquid chamber (34). The internal liquid can flow from one side of the liquid driving plate (35) close to the bracket (1) to the other side of the liquid driving plate (35) far from the bracket (1) through the internal liquid flow gap.

9. A low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device according to claim 1, characterized in that: A guiding and limiting cylinder (9) is integrally and hermetically arranged coaxially at one end of the liquid barrel (3) close to the driving plate (2). The inner diameter of the guiding and limiting cylinder (9) is equal to the rod diameter of the synchronous rod (6). The synchronous rod (6) is hermetically and coaxially slidably fitted in the guiding and limiting cylinder (9). One end of the guiding and limiting cylinder (9) close to the driving plate (2) is in limiting contact with the connecting rod (7), so that the synchronous rod (6) cannot move relative to the liquid barrel (3) in the direction close to the bracket (1), and the guiding and limiting cylinder (9) can guide the sliding of the synchronous rod (6) relative to the liquid barrel (3).

10. A low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device according to claim 1, characterized in that: It further includes an adjusting plate (19). Both the liquid barrel (3) and the transducer barrel (4) are connected to the bracket (1) through the adjusting plate (19). One end of each adjusting plate (19) is provided with an annular buckle (20). A first locking member (21) is provided at one end of the buckle (20) away from the adjusting plate (19). When the buckles (20) on the two adjusting plates (19) are respectively sleeved on the circumferences of the liquid barrel (3) and the transducer barrel (4), the two first locking members (21) can lock the liquid barrel (3) and the transducer barrel (4) on the two adjusting plates (19) respectively.

11. A low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device according to claim 1, characterized in that: The bracket (1) includes a bottom plate (30) and side plates (31). The two side plates (31) are integrally connected to both sides of the bottom plate (30), and the two side plates (31) are perpendicular to the bottom plate (30). A first adjusting groove (17) is opened at the center of the bottom plate (30). One end of the transducer barrel (4) close to the bracket (1) is integrally connected with a first slider (18). The transducer barrel (4) is slidably fitted in the first adjusting groove (17) through the first slider (18). Sliding grooves (25) are opened on the corresponding side plates (31) for the adjusting plates (19). One end of each adjusting plate (19) away from the buckle (20) is slidably fitted in the sliding groove (25). A second adjusting groove (22) is opened on each adjusting plate (19). A second fastener (23) is slidably fitted in the second adjusting groove (22). The second fastener (23) can lock the two adjusting plates (19) located on the same side plate (31) on the side plate (31).

12. According to the power generation principle of a low-flow ocean current energy piezoelectric and electromagnetic hybrid power generation device described in claim 1, it is characterized in that: When the drive plate (2) is impacted by ocean currents, the drive plate (2) moves towards the bracket (1) under the action of the ocean currents. The synchronizing rod (6) slides towards the bracket (1) relative to the liquid barrel (3) under the action of the drive plate (2). The second slider (8) moves towards the bracket (1) relative to the guiding slide rail (10) under the action of the connecting rod (7), compressing the return spring (13) until the force exerted by the return spring (13) on the second slider (8) is equal to the force exerted by the ocean currents on the drive plate (2). During this process, the liquid drive plate (35) connected to one end of the synchronizing rod (6) located in the liquid barrel (3) pushes the built-in liquid under the action of the synchronizing rod (6), causing the built-in liquid to surge along the axial direction of the liquid barrel (3) and impact the piezoelectric film (5). After being impacted, the piezoelectric film (5) bends and deforms, generating an instantaneous current. During the bending deformation process of the piezoelectric film (5), the coil (32) in the transducer barrel (4) moves relative to the two magnetic pole ends of the magnet (33) along the length direction of the two magnetic pole ends of the magnet (33) driven by the piezoelectric film (5), causing the coil (32) to cut the magnetic induction lines of the magnet (33) and generating an instantaneous current. The instantaneous currents generated in the piezoelectric film (5) and the coil (32) are conducted to the motor (14) through the wire (16), driving the driving pulley (28) to rotate. The driven pulley (29) rotates together with the driving pulley (28) driven by the synchronous belt (27), enabling the generator (15) to transmit stable current to the power station through the submarine cable.

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