A 3D-printed flexible book page structure triboelectric nanogenerator

Abstract

The present invention discloses a 3D-printed flexible book page structure triboelectric nanogenerator, which includes a support base mechanism, a flexible book page mechanism, a page swinging mechanism, a crank-rocker mechanism and a fan blade mechanism. The main body of the support base mechanism is two symmetrical quadrangular prisms with trapezoidal bottoms. The flexible book page mechanism is placed above the symmetrical quadrangular prisms of the support base mechanism. Opposite first friction units and second friction units are sequentially arranged on the pages of the flexible book page mechanism. The page swinging mechanism shares a connecting shaft with the flexible book page mechanism and is fixed above the middle of the flexible book page mechanism, and is connected to the rocker of the crank-rocker mechanism through the connecting shaft. The fan blade mechanism is connected to the crank of the crank-rocker mechanism through the connecting shaft. The present invention can realize the integration of multiple friction layers, thereby increasing the friction contact area and improving the output power. The flexible book pages can automatically recover their deformation when the external force disappears, increasing the durability of the triboelectric nanogenerator and expanding its application scope.

Description

Technical Field

[0001] The present invention relates to the technical field of triboelectric nanogenerators, and particularly to a 3D-printed flexible book page structure triboelectric nanogenerator. Background Art

[0002] Traditional energy sources mainly based on fossil fuels have caused many irreversible environmental problems while promoting the progress of human society. Moreover, the reserves of fossil fuels are limited and the extraction costs are becoming increasingly high. Therefore, developing green, inexpensive, and sustainable energy supply methods has become the focus of new energy research. Currently, there are many types of new energy sources. As one of them, triboelectric nanogenerators have a wide range of application scenarios, can effectively convert the scattered mechanical energy in the environment into electrical energy, and have unique advantages especially under low-frequency excitation, which is of great significance for the multi-dimensional and three-dimensional development of new energy.

[0003] Triboelectric nanogenerators have both energy supply and sensing dual properties and have currently been applied in many fields. The structures of past triboelectric nanogenerators often used subtractive manufacturing methods such as turning and laser cutting for processing, resulting in a large amount of waste of raw materials and being unable to process special structures. 3D printing technology is known for zero waste of raw materials, high precision, and high degree of freedom. Using 3D printing technology to manufacture triboelectric nanogenerators can effectively realize the construction of their complex structures and reduce the waste of raw materials. At the same time, a rich variety of raw materials effectively improve the physical properties of triboelectric nanogenerators, thereby enhancing their environmental adaptability.

[0004] However, existing triboelectric nanogenerators still have some technical deficiencies. It is difficult for them to integrate multiple friction layers, and the output performance is positively correlated with the number of friction layers. In addition, they are usually made by subtractive manufacturing of acrylic plates, lack flexibility and are difficult to form, which limits the output power and large-scale use of triboelectric nanogenerators to a certain extent. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a 3D-printed flexible book page structure triboelectric nanogenerator. The overall structure is compact and the design is novel. It can realize the integration of multiple friction layers of the triboelectric nanogenerator, thereby increasing the friction contact area, improving the output power, being able to automatically recover the deformation when the external force disappears, increasing the durability of the triboelectric nanogenerator, and expanding its application range. It can effectively solve the problems in the background art.

[0006] To achieve the above object, the present invention provides the following technical solution: a 3D-printed flexible book page structure triboelectric nanogenerator, including a support base mechanism, a flexible book page mechanism, a fixed shaft, a swing shaft and a drive shaft. The main body of the support base mechanism is two symmetric quadrangular prisms with trapezoidal bottoms, and a V-shaped groove is formed above the two symmetric trapezoidal quadrangular prisms. Fixed frames are provided at the front and rear ends of the support base mechanism. The flexible book page mechanism is arranged in the V-shaped groove above the support base mechanism. A first friction unit and a second friction unit are sequentially arranged opposite to each other on the page of the flexible book page mechanism. A page swing mechanism is arranged above the middle of the flexible book page mechanism. The fixed shaft sequentially passes through the through holes on the fixed frames, the fixed shaft hole II on the page swing mechanism and the fixed shaft hole I on the flexible book page mechanism. A crank is arranged on the drive shaft, and the other end of the crank is connected with a rocker through a bolt and a nut. The page swing mechanism is provided with a swing shaft hole, and one end of the swing shaft sequentially passes through the rocker and the swing shaft hole.

[0007] Further, it further includes a bearing seat. The bearing seat is fixed in the screw hole of the support base mechanism through a bolt. One end of the drive shaft sequentially passes through the bearing seat and the drive shaft hole on the support base mechanism, and the other end of the drive shaft is connected with a fan blade mechanism.

[0008] Further, the first friction unit is a metal conductive layer with weak electron-binding ability. The material of the first friction unit is aluminum, copper or copper-aluminum alloy. The second friction unit is a non-metal insulating layer with strong electron-binding ability. The material of the second friction unit is polytetrafluoroethylene or polyimide film. A back electrode is pasted on the surface of the second friction unit.

[0009] Further, the second friction unit tends to gain electrons, and the first friction unit tends to lose electrons, so as to form a potential difference between the first friction unit and the second friction unit. When an external circuit is connected, a current is formed to balance the potential.

[0010] Further, the thickness of both the first friction unit and the second friction unit is 50μm - 1mm.

[0011] Further, the material of the back electrode is aluminum or copper.

[0012] Further, the flexible book page mechanism is printed using flexible TPU and TPE materials, and the support base mechanism, the page swing mechanism, the crank, the rocker and the fan blade mechanism are printed using rigid PLA materials.

[0013] Further, the thickness of each book page in the flexible book page mechanism is 2mm - 5mm.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The present invention can achieve the integration of multiple friction layers of the triboelectric nanogenerator, thereby increasing the frictional contact area and improving the output power. The triboelectric nanogenerator is fabricated using 3D printing technology. The support base mechanism, swing leaf mechanism, crank, rocker, and fan blade mechanism are made of rigid PLA material, while the flexible page mechanism is made of TPU and TPE materials, which can self-recover deformation when the external force disappears, increasing the durability of the triboelectric nanogenerator and expanding its application scope. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the split structure of the present invention;

[0017] Figure 2 is a schematic diagram of the assembled structure of the present invention;

[0018] Figure 3 is a schematic diagram of the leftward swing working structure of the present invention;

[0019] Figure 4 is a schematic diagram of the frictional contact structure of the flexible page mechanism of the present invention;

[0020] Figure 5 is a data graph of the short-circuit current of the present invention;

[0021] Figure 6 is a data graph of the open-circuit voltage of the present invention.

[0022] In the figure: 1 support base mechanism, 2 flexible page mechanism, 3 swing leaf mechanism, 4 crank, 5 rocker, 6 fan blade mechanism, 7 first friction unit, 8 second friction unit, 9 bearing seat, 10 fixed shaft, 11 swing shaft, 12 drive shaft, 13 fixed frame, 14 drive shaft hole, 15 screw hole, 16 nut, 17 bolt, 21 fixed shaft hole Ⅰ, 31 swing shaft hole, 32 fixed shaft hole Ⅱ, 81 back electrode. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] Embodiment 1

[0025] Please refer to Figure 1-6, the present invention provides a technical solution: a 3D-printed flexible page structure triboelectric nanogenerator, which includes a support base mechanism 1, a flexible page mechanism 2, a fixed shaft 10, a swing shaft 11 and a drive shaft 12. The main body of the support base mechanism 1 is two symmetric quadrangular prisms with trapezoidal bottoms, and a V-shaped groove is formed above the two symmetric trapezoidal quadrangular prisms. Fixed frames 13 are provided at the front and rear ends of the support base mechanism 1. The flexible page mechanism 2 is arranged in the V-shaped groove above the support base mechanism 1. Opposite first friction units 7 and second friction units 8 are sequentially arranged on the pages of the flexible page mechanism 2. The thicknesses of both the first friction unit 7 and the second friction unit 8 are 50μm - 1mm. The first friction unit 7 is a metal conductive layer with weak electron-binding ability, and the material of the first friction unit 7 is aluminum, copper or copper-aluminum alloy. The second friction unit 8 is a non-metal insulating layer with strong electron-binding ability, and the material of the second friction unit 8 is polytetrafluoroethylene or polyimide film. A back electrode 81 is pasted on the surface of the second friction unit 8, and the material of the back electrode 81 is aluminum or copper. The second friction unit 8 tends to gain electrons, and the first friction unit 7 tends to lose electrons, thereby forming a potential difference between the first friction unit 7 and the second friction unit 8. When an external circuit is connected, in order to balance the potential, a current is formed. The thickness of each page in the flexible page mechanism 2 is 2mm - 5mm. A page swinging mechanism 3 is arranged above the middle of the flexible page mechanism 2. The fixed shaft 10 sequentially passes through the through holes on the fixed frames 13, the fixed shaft hole II 32 on the page swinging mechanism 3 and the fixed shaft hole I 21 on the flexible page mechanism 2. It also includes a bearing seat 9, and the bearing seat 9 is fixed in the screw hole 15 of the support base mechanism 1 through a bolt 17. One end of the drive shaft 12 sequentially passes through the bearing seat 9 and the drive shaft hole 14 on the support base mechanism 1. The other end of the drive shaft 12 is connected with a fan blade mechanism 6. A crank 4 is arranged on the drive shaft 12, and the other end of the crank 4 is connected with a rocker 5 through a bolt 17 and a nut 16. The page swinging mechanism 3 is provided with a swing shaft hole 31, and one end of the swing shaft 11 sequentially passes through the rocker 5 and the swing shaft hole 31. The flexible page mechanism 2 is printed using flexible TPU and TPE materials, and the support base mechanism 1, the page swinging mechanism 3, the crank 4, the rocker 5 and the fan blade mechanism 6 are printed using rigid PLA materials.

[0026] The specific preparation process of the 3D-printed flexible page structure triboelectric nanogenerator proposed by the present invention is as follows: Import the three-dimensional model data of the support base mechanism 1, the flexible page mechanism 2, the page swinging mechanism 3, the crank 4, the rocker 5 and the fan blade mechanism 6 designed with 3D software into the slicing software. After slicing by the slicing software, the gcode file is exported and transferred to a fused deposition modeling 3D printer, and the designed model is obtained by layer-by-layer forming. The flexible page structure 2 is printed using flexible TPU and TPE materials, and the remaining components are printed using rigid PLA materials.

[0027] As Figure 3As shown, under the action of external wind force, the rotation of the fan blade mechanism 6 drives the linkage rotation of the front and rear cranks 4. The rocker 5 connected to the crank 4 reciprocates to drive the swing page mechanism 3 to swing left and right reciprocally, realizing the periodic contact and separation between the first friction unit 7 and the second friction unit 8 on the pages of the flexible page mechanism 2; as Figure 4 shown, when the first friction unit 7 and the second friction unit 8 are in close contact, due to the triboelectric effect, their inner surfaces will carry static charges with equal amounts and opposite signs. The inner surface of the first friction unit 7 carries positive charges, and the inner surface of the second friction unit 8 carries negative charges. When the swing page mechanism 3 leaves one side and presses on the other side, the first friction unit 7 and the second friction unit 8 on the leaving side are separated from each other, and an induced potential difference will be generated between the two electrodes. The induced potential difference drives the electrons between the two electrodes to move in the external circuit to form a current. The side being pressed repeats the process from triboelectricity generation to current generation by electrostatic induction. In this way, a periodic loop is formed.

[0028] The material of the first friction unit 7 is aluminum, copper, or a copper-aluminum alloy in any proportion. The thickness of the first friction unit 7 is 50μm - 1mm. The material of the second friction unit 8 is polytetrafluoroethylene or polyimide film. The thickness of the second friction unit 8 is 50μm - 1mm; the second friction unit 8 is subjected to charge injection pretreatment; the first friction unit 7 and the second friction unit 8 are distributed in an array on the flexible page mechanism 2.

[0029] According to the above description of the working principle of the 3D-printed flexible page structure triboelectric nanogenerator, the number of friction units of the 3D-printed flexible page structure triboelectric nanogenerator manufactured according to the above preferred scheme is 12. The friction layers of the 12 first friction units 7 are evenly arranged in an array on the pages of the flexible page mechanism 2; they alternately contact and separate with the second friction units, 6 second friction units each time, among the second friction units distributed in an array on the pages of the flexible page mechanism 2. The electrode plates in each same friction unit are connected in parallel with wires; when the fan blade rotates, then as Figure 5 and 6 shown, the maximum short-circuit current and open-circuit voltage of the 3D-printed flexible page structure triboelectric nanogenerator are 350μA and 600V respectively. When the 3D-printed flexible page structure triboelectric nanogenerator works, it can simultaneously drive 300 LED lights to emit light.

[0030] Therefore, it can be known that the 3D-printed flexible book page structure triboelectric nanogenerator of the present invention can achieve the integration of multiple friction layers of the triboelectric nanogenerator, thereby increasing the friction contact area and improving the output power. At the same time, the 3D-printed flexible book page structure triboelectric nanogenerator is made by 3D printing technology. The support base mechanism 1, the swing page mechanism 3, the crank 4, the rocker 5 and the fan blade mechanism 6 use rigid PLA material, and the flexible book page mechanism 2 uses TPU and TPE materials, which can automatically recover the deformation when the external force disappears, increasing the durability of the triboelectric nanogenerator and expanding its application scope. In addition, the multi-contact layer swinging triboelectric nanogenerator of the present invention has low requirements for the vibration frequency and can convert the energy of low-frequency vibrations in nature into electrical energy.

[0031] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A 3D-printed flexible book page structure triboelectric nanogenerator, comprising a support base mechanism (1), a flexible book page mechanism (2), a fixed shaft (10), a swing shaft (11) and a drive shaft (12), characterized in that: The main body of the support base mechanism (1) is two symmetric quadrangular prisms with trapezoidal bases, and a V-shaped groove is formed above the two symmetric trapezoidal quadrangular prisms. Fixed frames (13) are provided at the front and rear ends of the support base mechanism (1). The flexible page mechanism (2) is arranged in the V-shaped groove above the support base mechanism (1). Opposite first friction units (7) and second friction units (8) are sequentially arranged on the pages of the flexible page mechanism (2). A page swinging mechanism (3) is arranged above the middle of the flexible page mechanism (2). A fixed shaft (10) sequentially passes through the through holes on the fixed frames (13), the fixed shaft hole II (32) on the page swinging mechanism (3), and the fixed shaft hole I (21) on the flexible page mechanism (2). A crank (4) is arranged on the drive shaft (12), and the other end of the crank (4) is connected with a rocker (5) through a bolt (17) and a nut (16). The page swinging mechanism (3) is provided with a swinging shaft hole (31), and one end of a swinging shaft (11) sequentially passes through the rocker (5) and the swinging shaft hole (31). It further includes a bearing seat (9). The bearing seat (9) is fixed in the screw hole (15) of the support base mechanism (1) through a bolt (17). One end of the drive shaft (12) sequentially passes through the bearing seat (9) and the drive shaft hole (14) on the support base mechanism (1), and the other end of the drive shaft (12) is connected with a fan blade mechanism (6).

2. The triboelectric nanogenerator with a flexible book page structure fabricated by 3D printing according to claim 1, wherein: The first friction unit (7) is a metal conductive layer with weak electron-binding ability. The material of the first friction unit (7) is aluminum, copper, or copper-aluminum alloy. The second friction unit (8) is a non-metal insulating layer with strong electron-binding ability. The material of the second friction unit (8) is polytetrafluoroethylene or polyimide film, and a back electrode (81) is pasted on the surface of the second friction unit (8).

3. A 3D-printed flexible book page structure triboelectric nanogenerator according to claim 1, characterized in that: The second friction unit (8) tends to gain electrons, and the first friction unit (7) tends to lose electrons, thereby forming a potential difference between the first friction unit (7) and the second friction unit (8). When an external circuit is connected, a current is formed to balance the potential.

4. A 3D-printed flexible book page structure triboelectric nanogenerator according to claim 1, characterized in that: The thicknesses of both the first friction unit (7) and the second friction unit (8) are 50 μm - 1 mm.

5. A 3D printed flexible book page structure triboelectric nanogenerator according to claim 2, characterized in that: The material of the back electrode (81) is aluminum or copper.

6. A 3D printed flexible book page structure triboelectric nanogenerator according to claim 2, characterized in that: The flexible page mechanism (2) is printed using flexible TPU or TPE materials, and the support base mechanism (1), the page swinging mechanism (3), the crank (4), the rocker (5), and the fan blade mechanism (6) are printed using rigid PLA materials.

7. A 3D printed flexible book page structure triboelectric nanogenerator according to claim 6, characterized in that: The thickness of each page in the flexible page mechanism (2) is 2 mm - 5 mm.

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