Energy converter driven by seawater pressure

Abstract

The utility model discloses an energy converter driven by seawater pressure, which comprises a wave collecting hollow floating ball, the outer surface of the wave collecting hollow floating ball is provided with a piezoelectric laminated structure for collecting the mechanical stress of the seawater pressure on the wave collecting hollow floating ball, and the piezoelectric laminated structure wraps the wave collecting hollow floating ball. A structural waterproof film is arranged on the outer surface of the piezoelectric laminated structure; a small solid ball and a piezoelectric pull type structure are arranged in the wave collecting hollow floating ball, the piezoelectric pull type structure is arranged on a motion path of the small solid ball, and the small solid ball can freely move in the wave collecting hollow floating ball; the piezoelectric pull-type structures are covered with piezoelectric PVDF films, and the wave collecting hollow floating ball is driven by waves to move to drive the solid small ball to generate pressing force on the piezoelectric pull-type structures and the piezoelectric PVDF films, so that electric power is generated. The provided energy converter has high sensitivity and broadband response, and can efficiently convert tiny mechanical vibration or pressure change into electric energy.

Description

TECHNICAL FIELD

[0001] The utility model relates to ocean energy clean utilization technical field, concretely relates to a seawater pressure drive's energy converter. BACKGROUND

[0002] At present, ocean energy utilization mainly includes the utilization of tidal energy, wave energy, temperature difference energy, salinity difference energy and ocean current energy. Tidal energy utilizes the rise and fall of tides to drive turbine generators, wave energy utilizes the movement of sea surface waves to generate electricity, temperature difference energy utilizes the temperature difference between the surface layer and the deep layer of the ocean to generate electricity, salinity difference energy utilizes the salinity difference between seawater and freshwater to generate electricity, and ocean current energy utilizes the water flow in the ocean to drive turbine generators. These energy forms are not only renewable, but also almost do not produce greenhouse gases and other pollutants in the conversion process, with the characteristics of being clean and sustainable. In recent years, with the rapid development of science and technology, the development technology of ocean energy has made remarkable progress. In particular, the application of ocean piezoelectric power generation device opens up a new path for the efficient utilization of ocean energy. Ocean piezoelectric power generation device utilizes the charge effect of piezoelectric material under mechanical stress to convert the kinetic energy of waves, tides and other in the ocean into electrical energy. This technology is not only environmentally friendly and pollution-free, but also has the characteristics of high efficiency and long service life. With the progress of nanotechnology and material science, high-performance piezoelectric materials are emerging, which greatly improves the performance of ocean piezoelectric power generation device, gradually reduces the cost, and enhances the feasibility of commercial application.

[0003] At present, the traditional ocean wave energy collection method mainly includes two types; One is a buoy-PTO device, which is composed of a floating object, a PTO unit, a control system, power electronic equipment, etc. Among them; PTO includes hydraulic motor, mechanical drive, etc. This type of power generation method has the problems of low energy conversion efficiency, environmental pollution caused by hydraulic leakage, etc. The other is an oscillating water column (OWC) device, which includes pneumatic air turbine, water turbine transmission, etc. This type of power generation method has certain energy threshold, large device, and power generation noise pollution. UTILITY MODEL CONTENT

[0004] The utility model aims at: in view of the problems of low energy conversion efficiency, environmental pollution, energy threshold, large device, noise pollution and other problems existing in the current ocean energy conversion device, provides a seawater pressure drive's energy converter.

[0005] The technical scheme of the utility model is as follows:

[0006] The application discloses a seawater pressure driven energy converter, which comprises a wave collecting hollow floating ball, the outer surface of the wave collecting hollow floating ball is provided with at least two piezoelectric laminated structures for collecting the mechanical stress of seawater pressure on the wave collecting hollow floating ball, the at least two piezoelectric laminated structures wrap the whole wave collecting hollow floating ball, and the outer surface of the piezoelectric laminated structure is provided with a structural waterproof film; the inside of the wave collecting hollow floating ball is provided with at least one solid small ball and at least two piezoelectric pull type structures, the at least two piezoelectric pull type structures are arranged on the movement path of the solid small ball, and the solid small ball can freely move in the wave collecting hollow floating ball; the at least two piezoelectric pull type structures are each covered with a piezoelectric PVDF film, and the movement of the wave collecting hollow floating ball caused by waves drives the solid small ball to generate a compression force on the piezoelectric pull type structure and the piezoelectric PVDF film, so as to generate electric power.

[0007] The wave collecting hollow floating ball is connected with a seabed structure through a rope, and the seabed structure is internally provided with a control system, a sensor, a controller and a protection device.

[0008] Further, the piezoelectric laminated structure is alternately stacked by at least two electrode layers and at least two piezoelectric PZT material layers, the number of stacked layers of the piezoelectric PZT material layer is 20-50 layers; the electrode layer comprises a battery positive electrode and a battery negative electrode, and the electrode layer and the piezoelectric PZT material layer are wrapped by an encapsulating material layer.

[0009] Further, the electrode layer and the piezoelectric PZT material layer are connected by sintering or bonding, the sintering temperature is 1100-1300 DEG C, and the sintering time is 2-4 hours.

[0010] Further, the battery positive electrode and the battery negative electrode are made of silver material, and the encapsulating material layer is polyurethane or epoxy resin.

[0011] Further, the thickness of the piezoelectric PZT material layer is 30-50 mu m.

[0012] Further, the piezoelectric pull type structure comprises a metal shell and a piezoelectric pull type structure PZT piezoelectric material layer, and the metal shell is an aluminum shell.

[0013] Further, the piezoelectric pull type structure PZT piezoelectric material layer and the piezoelectric PZT material layer are both PZT-5H.

[0014] Further, the diameter of the wave collecting hollow floating ball is 0.5-1.5 m, and the wave collecting hollow floating ball is made of aluminum alloy material.

[0015] Further, the diameter of the solid small ball is 0.1-0.5 m, the material of the solid small ball is stainless steel or aluminum alloy, and the outer surface of the solid small ball is wrapped by rubber.

[0016] Further, the rope is provided with a power transmission line, and the material of the rope is nylon or polyester fiber; the sensor and the controller control the floating range of the floating ball, and the protection device includes a rectifier and a voltage stabilizer, and the voltage and the current of the output power are controlled.

[0017] Compared with the prior art, the utility model has the advantages of:

[0018] 1. A seawater pressure driven energy converter, the provided piezoelectric energy converter has high sensitivity and wide band response, and can efficiently convert small mechanical vibration or pressure change into electric energy;

[0019] 2. A seawater pressure driven energy converter, the piezoelectric energy converter of the device is designed to be light and compact, without complex mechanical moving parts, reducing maintenance cost and prolonging service life;

[0020] 3. A seawater pressure driven energy converter, the device is environmentally friendly, does not produce harmful substances, uses clean and renewable ocean wave energy or flow energy, helps to reduce dependence on fossil fuels and reduce carbon emissions;

[0021] 4. A seawater pressure driven energy converter, the piezoelectric energy converter of the device also has strong adaptability, suitable for various marine environments and different wave conditions, and can be used for energy collection, sensors and monitoring equipment and other applications;

[0022] 5. A seawater pressure driven energy converter, the device has low material cost, low installation cost, stable and reliable structure, strong corrosion resistance, modular design makes it easy to expand and upgrade, and high overall cost benefit. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the structural schematic diagram of the application.

[0024] Figure 2 It is the structural schematic diagram of the application.

[0025] Figure 3 It is the piezoelectric laminated structure schematic diagram of the application.

[0026] Figure 4 It is the piezoelectric pull type structure schematic diagram of the application.

[0027] Reference signs: 1-structural waterproof film, 2-piezoelectric laminated structure, 3-wave collection hollow floating ball, 4-piezoelectric pull type structure, 5-piezoelectric PVDF film, 6-solid small ball, 7-rope, 8-sea bottom structure, 31-battery positive electrode, 32-battery negative electrode, 33-piezoelectric PZT material layer, 34-encapsulation material layer, 41-metal shell, 42-piezoelectric pull type structure PZT piezoelectric material layer. DETAILED DESCRIPTION

[0028] It should be noted that the relational terms herein, such as first and second, and the like, are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0029] The features and performances of the present application will be further described in detail below in conjunction with the embodiments.

[0030] Please refer to Figures 1-4 , a seawater pressure driven energy converter, as shown in Figure 1 and Figure 2 , comprising a wave collecting hollow floating ball 3, the outer surface of the wave collecting hollow floating ball 3 is provided with at least two piezoelectric laminated structures 2 collecting the mechanical stress of the wave collecting hollow floating ball 3 by seawater pressure, at least two piezoelectric laminated structures 2 wrap the whole wave collecting hollow floating ball 3, the outer surface of the piezoelectric laminated structure 2 is provided with a structural waterproof film 1; the inside of the wave collecting hollow floating ball 3 is provided with at least one solid small ball 6 and at least two piezoelectric pull type structures 4, at least two piezoelectric pull type structures 4 are arranged on the movement path of the solid small ball 6, the solid small ball 6 can move freely inside the wave collecting hollow floating ball 3; the piezoelectric pull type structure 4 is covered with a piezoelectric PVDF film 5 to improve the power generation efficiency; the movement of the wave collecting hollow floating ball 3 caused by the wave drives the solid small ball 6 to generate compression force on the piezoelectric pull type structure 4 and the piezoelectric PVDF film 5, thereby generating electricity;

[0031] The wave collecting hollow floating ball 3 is connected with a seabed structure 8 through a rope 7, the seabed structure 8 is provided with a control system, a sensor, a controller and a protection device.

[0032] As shown in Figure 3 , the piezoelectric laminated structure 2 is alternately stacked by at least two electrode layers and at least two piezoelectric PZT material layers 33, forming an efficient energy conversion unit. The stacking number of the piezoelectric PZT material layer 33 is 20 to 50 layers, and the overall performance is optimal within this range; the electrode layer includes a battery positive electrode 31 and a battery negative electrode 32, and the electrode layer and the piezoelectric PZT material layer 33 are wrapped by a packaging material layer 34.

[0033] The electrode layer and the piezoelectric PZT material layer 33 are connected by sintering or bonding, ensuring the stability and reliability of the structure. The sintering temperature is 1100-1300°C, and the sintering time is 2-4h. Sintering can provide better structural stability and reliability.

[0034] The battery positive electrode 31 and the battery negative electrode 32 are made of silver material, which has good conductivity and adhesion, and relatively low cost. The encapsulation material layer 34 is polyurethane or epoxy resin, which has good waterproof and corrosion-resistant performance. The use of waterproof and corrosion-resistant packaging technology ensures the long-term stable operation of the piezoelectric energy converter in the marine environment.

[0035] The thickness of the piezoelectric PZT material layer 33 is 30-50μm. Within this range, the energy conversion efficiency is the highest.

[0036] As shown in Figure 4 The piezoelectric pull structure 4 includes a metal shell 41 and a piezoelectric pull structure PZT piezoelectric material layer 42, and the metal shell 41 is an aluminum shell.

[0037] The piezoelectric pull structure PZT piezoelectric material layer 42 and the piezoelectric PZT material layer 33 are both PZT-5H, which has a high piezoelectric coefficient and good corrosion resistance.

[0038] The diameter of the wave collection hollow floating ball 3 is 0.5-1.5m, and the wave collection hollow floating ball 3 is made of aluminum alloy material, which has the characteristics of light weight, high strength and corrosion resistance. The wave collection hollow floating ball 3 is a hollow structure, filled with air to ensure that it can float in the ocean.

[0039] The diameter of the solid small ball 6 is 0.1-0.5m, and the material of the solid small ball 6 is stainless steel or aluminum alloy, which has good corrosion resistance and mechanical strength. The outer surface of the solid small ball 6 is wrapped with rubber.

[0040] The rope 7 is provided with a power transmission line to transport and store the generated electric energy. The material of the rope 7 is nylon or polyester fiber, which has good corrosion resistance and strength; the sensor and the controller control the floating range of the floating ball to ensure the efficient and safe operation of the system, and the protection device includes a rectifier and a voltage stabilizer to control the voltage and current of the output power, avoiding the destruction of the power system. Installed inside the seabed structure 8, ensuring the compactness and reliability of the system. The seabed structure 8 is simpler than the traditional mechanical structure, and is suitable for various marine environments, including shallow and deep sea areas.

[0041] In another specific embodiment, a seawater pressure driven piezoelectric energy converter, as shown in Figure 1 and Figure 2The wave collecting hollow floating ball 3 is made of aluminum with a diameter of 1 meter and filled with air. An energy converter composed of multiple layers of PZT-5H piezoelectric laminated structure 2 is installed outside the wave collecting hollow floating ball 3. The piezoelectric PZT material layer 33 in the piezoelectric laminated structure 2 is 40 μm thick and has 30 layers. In addition, silver metal is selected as the electrode layer of the piezoelectric laminated structure 2, with a thickness of 5 μm. The piezoelectric PZT material layer 33 and silver metal electrode layer are alternately stacked, with 30 layers. Sintering at a temperature of 1200°C for 3 hours ensures the stability and reliability of the interlayer connection. Polyurethane material is used for packaging to ensure long-term stable operation of the structure in the marine environment. The outer side structure of the piezoelectric laminated structure 2 is covered with a waterproof film 1 made of polyester fiber material, achieving the waterproof effect of the entire device.

[0042] A stainless steel solid ball 6 with a diameter of 0.2 meters is placed inside the wave collecting hollow floating ball 3. Multiple PZT piezoelectric dolly structures 4 are installed inside the wave collecting hollow floating ball 3. The piezoelectric dolly structure 4 is an aluminum shell with a thickness of 10 mm, and the shell contains a group of piezoelectric sheets, with each group having 30 layers and each piezoelectric sheet being 40 μm thick. The piezoelectric dolly structure 4 is covered with a piezoelectric PVDF film 5 with a thickness of 5 mm. The solid ball 6 can move freely inside the hollow ball, generating electricity by the compression force of the solid ball 6 on the piezoelectric film caused by the movement of the wave collecting hollow floating ball 3 due to waves. This increases the output efficiency of the piezoelectric energy converter.

[0043] The wave collecting hollow floating ball 3 is connected to the seabed by a polyester fiber rope 7 with a length of 10 meters. The rope 7 is wrapped with power transmission lines of the piezoelectric laminated structure 2 and the piezoelectric dolly structure 4, which are wrapped with waterproof material to transmit the electricity generated by the piezoelectric materials. The seabed structure 8 is equipped with an internal control system, including sensors, controllers and protection devices. The sensors and controllers control the floating range of the floating ball to ensure efficient and safe operation of the system. The protection devices include rectifiers and voltage stabilizers to control the voltage and current of the output power to prevent the power system from being damaged. The system is installed inside the seabed fixing device to ensure compactness and reliability.

[0044] Please refer to Figure 3, an enlarged schematic diagram of the piezoelectric laminated structure 2 of the present application. When external mechanical energy (such as the up-and-down movement of ocean waves or water pressure) acts on the laminated structure, the structure deforms. At this time, when the piezoelectric material layer is subjected to mechanical stress (such as compression or stretching), the internal dipoles rearrange, resulting in charge separation within the material. The charge separation forms opposite charges on the two surfaces of the piezoelectric PZT material layer 33, generating a potential difference. The charges are conducted to the external circuit through the metal electrode and rectified by the rectifier, converting alternating current into direct current. The rectified direct current is stabilized by the voltage stabilizer, ensuring the stability and reliability of the output power. The stabilized power can be stored in a battery or connected to the power grid for subsequent use.

[0045] Please refer to Figure 4 , an enlarged schematic diagram of the piezoelectric plucking structure 4 of the present application. When the internal solid ball 6 moves with the waves or vibrations, it presses the metal shell 41 of the piezoelectric plucking structure 4. When the arch-shaped shell is subjected to vertical pressure, it converts the vertical pressure stress into a horizontal tensile stress. At this time, the piezoelectric plucking structure PZT piezoelectric material layer 42 is fixed to the metal shell 41 of the piezoelectric plucking structure 4 and is subjected to a horizontal tensile stress. The internal dipoles rearrange, resulting in charge separation within the material. The charge separation forms opposite charges on the two surfaces of the piezoelectric plucking structure PZT piezoelectric material layer 42, generating a potential. In addition, the piezoelectric plucking structure 4 is covered with a layer of piezoelectric PVDF film 5. When the PVDF material is subjected to mechanical stress, its molecular chain deforms, resulting in the rearrangement of dipoles. The rearrangement of dipoles produces opposite charges on the two surfaces of the material, forming a potential difference. These charges can be collected and utilized through an external circuit, thereby realizing the conversion of mechanical energy into electrical energy.

[0046] In operation, the seawater pressure on the piezoelectric laminated structure 2 generates mechanical stress and thus generates electricity. The waves caused by the fluctuations of seawater cause the hollow floating ball 3 to move, driving the solid ball 6 to generate pressure on the piezoelectric plucking structure 4 and the piezoelectric PVDF film 5, thereby generating electricity. The electricity is transported through the polyester fiber rope 7 and rectified and stabilized by the internal control system of the seabed structure 8.

[0047] The above-described embodiments only express the specific implementation of the present application, which is described in detail and specifically, but it should not be construed as a limitation on the scope of protection of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the technical concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application.

Claims

1. A sea water pressure driven energy converter, characterized in that, The application relates to a wave collecting hollow floating ball (3) which is provided with at least two piezoelectric laminated structures (2) for collecting the mechanical stress of seawater pressure on the wave collecting hollow floating ball (3) on the outer surface of the wave collecting hollow floating ball (3), the at least two piezoelectric laminated structures (2) wrap the whole wave collecting hollow floating ball (3), and the outer surface of the piezoelectric laminated structure (2) is provided with a structural waterproof film (1); the inside of the wave collecting hollow floating ball (3) is provided with at least one solid small ball (6) and at least two piezoelectric pull structures (4), the at least two piezoelectric pull structures (4) are arranged on the movement path of the solid small ball (6), and the solid small ball (6) can freely move in the wave collecting hollow floating ball (3); the at least two piezoelectric pull structures (4) are each covered with a piezoelectric PVDF film (5), the movement of the wave collecting hollow floating ball (3) caused by waves drives the solid small ball (6) to generate a compression force on the piezoelectric pull structure (4) and the piezoelectric PVDF film (5) to further generate electric power; The wave collecting hollow floating ball (3) is connected with a seabed structure (8) through a rope (7), and the seabed structure (8) is provided with a control system, a sensor, a controller and a protection device.

2. A seawater pressure driven energy converter according to claim 1, characterized in that The piezoelectric laminated structure (2) is alternately stacked by at least two electrode layers and at least two piezoelectric PZT material layers (33), the number of stacked layers of the piezoelectric PZT material layer (33) is 20-50 layers; the electrode layer comprises a battery positive electrode (31) and a battery negative electrode (32), and the electrode layer and the piezoelectric PZT material layer (33) are wrapped by an encapsulating material layer (34).

3. A seawater pressure driven energy converter according to claim 2, characterised in that, The electrode layer and the piezoelectric PZT material layer (33) are connected by sintering or bonding.

4. A seawater pressure driven energy converter according to claim 2, characterised in that, The battery positive electrode (31) and the battery negative electrode (32) are made of silver material, and the encapsulating material layer (34) is polyurethane or epoxy resin.

5. A seawater pressure driven energy converter according to claim 2, characterized in that, The thickness of the piezoelectric PZT material layer (33) is 30-50 mu m.

6. A seawater pressure driven energy converter according to claim 2, characterized in that The piezoelectric pull structure (4) comprises a metal shell (41) and a piezoelectric pull structure PZT piezoelectric material layer (42), and the metal shell (41) is an aluminum shell.

7. A seawater pressure driven energy converter according to claim 6, characterised in that, The piezoelectric pull structure PZT piezoelectric material layer (42) and the piezoelectric PZT material layer (33) are both PZT-5H.

8. A seawater pressure driven energy converter according to claim 1, characterized in that The diameter of the wave collecting hollow floating ball (3) is 0.5-1.5 m, and the wave collecting hollow floating ball (3) is made of aluminum alloy material.

9. A seawater pressure driven energy converter according to claim 8, characterised in that, The diameter of the solid small ball (6) is 0.1-0.5 m, the material of the solid small ball (6) is stainless steel or aluminum alloy, and the outer surface of the solid small ball (6) is wrapped by rubber.

10. A seawater pressure driven energy converter according to claim 1, characterized in that The rope (7) is provided with a power transmission line, and the material of the rope (7) is nylon or polyester fiber; the sensor and the controller control the floating range of the floating ball, the protection device comprises a rectifier and a voltage stabilizer, and the voltage and the current of the control output power are controlled.

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