A piezoelectric-triboelectric hybrid micro fingertip energy harvester

Abstract

The present invention discloses a piezoelectric-triboelectric hybrid micro fingertip energy harvester, which relates to the fields of triboelectric nanogeneration technology and piezoelectric power generation technology. It includes a rotating wing, a piezoelectric housing, piezoelectric sheets, a friction base, a rubber ring, a roller, a first electrode layer, a second electrode layer, and a friction layer; the rotating wing is rotatably connected to the piezoelectric housing, the piezoelectric sheets and the rubber ring are both arranged on the piezoelectric housing, the friction base is connected to the rotating wing, the friction base and the rubber ring rotate relative to each other, the roller is arranged on the friction base and can rotate around its axis, the first electrode layer is arranged on the roller, and the second electrode layer and the friction layer are arranged on the friction base; when the rotating wing and the piezoelectric housing rotate relative to each other, the rotating wing can contact the piezoelectric sheets, and when the roller rotates, the first electrode layer can contact the rubber ring and the friction layer. The present invention can utilize the triboelectrification effect and the piezoelectric effect to collect the energy during finger shaking, so as to realize small-scale and continuous power supply for micro-devices.

Description

Technical Field

[0001] The present invention relates to the technical fields of triboelectric nanogeneration technology and piezoelectric power generation technology, and particularly relates to a piezoelectric-triboelectric hybrid micro fingertip energy harvester. Background Art

[0002] Since the industrial revolution began in the 1870s, due to the invention and use of generators and motors, the application of electricity has become increasingly widespread, and human history has entered the "electrical age". In recent years, with the development of technology, the Internet of Things technology has been widely popularized, and most of the micro-devices in life are connected to electricity. Therefore, powering these devices has become an urgent problem to be solved. However, most of the current generators are large in size and cannot achieve small-scale and sustainable power supply. With the gradual research on triboelectric nanogenerators by relevant personnel, the trouble of powering micro-devices has been gradually solved. Triboelectric nanogenerators are generators that are environmentally friendly, sustainable, and low in manufacturing cost, and have excellent application prospects. It can achieve continuous power supply for micro-devices, and the research in this field has received much attention in recent years. Summary of the Invention

[0003] The purpose of the present invention is to provide a piezoelectric-triboelectric hybrid micro fingertip energy harvester to solve the problems existing in the above-mentioned prior art, and be able to collect the energy generated when the finger shakes by using the triboelectrification effect and piezoelectric effect, so as to achieve small-scale and continuous power supply for micro-devices.

[0004] To achieve the above purpose, the present invention provides the following solution:

[0005] The present invention provides a piezoelectric-triboelectric hybrid micro fingertip energy harvester, including a rotating wing, a piezoelectric housing, a piezoelectric sheet, a friction base, a rubber ring, a roller, a first electrode layer, a second electrode layer, and a friction layer; the rotating wing is rotatably connected to the piezoelectric housing, the piezoelectric sheet and the rubber ring are both arranged on the piezoelectric housing, the friction base is connected to the rotating wing, the friction base and the rubber ring rotate relative to each other, the roller is arranged on the friction base, the roller can rotate around its axis, the first electrode layer is arranged on the roller, and the second electrode layer and the friction layer are arranged on the friction base; when the rotating wing and the piezoelectric housing rotate relative to each other, the rotating wing can contact the piezoelectric sheet, and when the roller rotates, the first electrode layer can contact the rubber ring and the friction layer.

[0006] Preferably, the piezoelectric housing includes a first piezoelectric housing and a second piezoelectric housing, which are respectively located on both sides of the rotary wing. A plurality of piezoelectric sheets are circumferentially arranged on both the first piezoelectric housing and the second piezoelectric housing. One end of each piezoelectric sheet is connected to the first piezoelectric housing or the second piezoelectric housing, and the other end of each piezoelectric sheet is used to contact the rotary wing.

[0007] Preferably, the friction base is located outside the rotary wing; rubber rings are provided on the outer sides of both the first piezoelectric housing and the second piezoelectric housing, and each rubber ring is respectively located inside the friction base.

[0008] Preferably, the friction base and the rotary wing are connected by a plurality of support rods. Each support rod respectively passes through the gap between the first piezoelectric housing and the second piezoelectric housing. One end of each support rod is connected to the rotary wing, and the other end of each support rod is located in the strip-shaped groove of the friction base.

[0009] Preferably, a friction end cover is provided on one side of the friction base, and the strip-shaped protrusions of each friction end cover are respectively located in the corresponding strip-shaped grooves.

[0010] Preferably, a plurality of installation grooves are circumferentially formed on the inner side of the friction base. A protrusion shaft is provided in each installation groove. Each roller is respectively sleeved outside one of the protrusion shafts, and the roller is rotatably connected to the protrusion shaft. A first electrode layer is respectively provided in the groove of each roller. A second electrode layer and a friction layer are provided in each installation groove. The friction layer is provided inside the second electrode layer and contacts the second electrode layer.

[0011] Preferably, the first electrode layer is made of aluminum; the second electrode layer is made of gold; the friction layer is made of polyimide.

[0012] Preferably, the rotary wing and the piezoelectric housing are rotatably connected by a bearing. The rotary wing is connected to the outer ring of the bearing, and the piezoelectric housing is connected to the inner ring of the bearing.

[0013] Preferably, the rotary wing, the piezoelectric housing, the friction base and the rubber ring are coaxially arranged.

[0014] Preferably, the surface of the friction layer is provided with a nano-structure or a micro-structure.

[0015] The present invention has achieved the following technical effects compared with the prior art:

[0016] When the piezoelectric-triboelectric hybrid micro fingertip energy collector of the present invention is used, the rotation of the rotating wing is driven by the shaking of the fingertips, and then the piezoelectric sheet of the piezoelectric shell is moved to vibrate. The dielectric in the piezoelectric sheet is deformed by the external force in a certain direction, and polarization occurs inside the piezoelectric sheet. At the same time, positive and negative charges appear on the two opposite surfaces of the piezoelectric sheet, thereby generating a voltage. When the rotating wing rotates, the rotation of the friction base is driven, and the roller located on the friction base rotates along with the rotating wing. Because the roller is in contact and friction with the rubber ring, the roller itself rotates while the roller rotates, and the first electrode layer on the roller and the friction layer on the friction base are periodically in friction contact, generating charges. When the first electrode layer rotates in and begins to contact and rub with the friction layer, positive charges flow from the second electrode layer to the first electrode layer, forming a current. Subsequently, the first electrode layer rotates out, and the positive charges on the first electrode layer begin to flow to the second electrode layer, forming a reverse current. The piezoelectric-triboelectric hybrid micro fingertip energy harvester of the present invention can solve the self-power supply problem of micro-sized devices, and can convert the mechanical energy generated by the human body into electrical energy for use by micro-sized devices, further expanding the application field of the friction nanogenerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is an axonometric diagram of the main three-dimensional structure of a piezoelectric-triboelectric hybrid micro-fingertip energy harvester according to the present invention;

[0019] Figure 2 It is an exploded diagram of the main three-dimensional structure of a piezoelectric-triboelectric hybrid micro-fingertip energy harvester involved in the present invention;

[0020] Figure 3 It is a right view of the main three-dimensional structure of a piezoelectric-triboelectric hybrid micro-fingertip energy harvester according to the present invention;

[0021] Figure 4 A half-section view of the main three-dimensional structure of a piezoelectric-triboelectric hybrid micro-fingertip energy harvester according to the present invention;

[0022] Figure 5 A stepped cross-sectional view of the main three-dimensional structure of a piezoelectric-triboelectric hybrid micro-fingertip energy collector according to the present invention;

[0023] Figure 6 Isometric view of the three-dimensional structure of the triboelectric power generation device of a piezoelectric-triboelectric hybrid micro fingertip energy harvester according to the present invention;

[0024] Wherein: 1 - bearing, 2 - first piezoelectric housing, 3 - second piezoelectric housing, 4 - piezoelectric sheet, 5 - rotating wing, 6 - support rod, 7 - friction base, 8 - roller, 9 - first electrode layer, 10 - second electrode layer, 11 - friction layer, 12 - rubber ring, 13 - friction end cap. Detailed implementation manners

[0025] 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.

[0026] The object of the present invention is to provide a piezoelectric-triboelectric hybrid micro fingertip energy harvester to solve the problems existing in the above-mentioned prior art, and be able to collect the energy generated when the finger shakes by using the triboelectric effect and the piezoelectric effect, so as to realize small-scale and continuous power supply for micro devices.

[0027] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0028] As Figures 1-6As shown: This embodiment provides a piezoelectric-triboelectric hybrid micro-fingertip energy collector, including a rotating wing 5, a piezoelectric shell, a piezoelectric sheet 4, a friction base 7, a rubber ring 12, a roller 8, a first electrode layer 9, a second electrode layer 10 and a friction layer 11; the rotating wing 5 and the piezoelectric shell are rotatably connected through a bearing 1, the rotating wing 5 and the outer ring of the bearing 1 are connected through an interference fit, the piezoelectric shell and the inner ring of the bearing 1 are connected through an interference fit, the bearing 1, the rotating wing 5, the piezoelectric shell, the friction base 7 and the rubber ring 12 are coaxially arranged, the piezoelectric sheet 4 and the rubber ring 12 are both arranged on the piezoelectric shell, and the friction The base 7 is connected to the rotating wing 5, the friction base 7 and the rubber ring 12 rotate relative to each other, the roller 8 is arranged on the friction base 7, the roller 8 can rotate around its axis, the first electrode layer 9 is arranged on the roller 8, and the second electrode layer 10 and the friction layer 11 are arranged on the friction base 7; when the rotating wing 5 and the piezoelectric shell rotate relative to each other, the rotating wing 5 can contact the piezoelectric sheet 4, when the roller 8 rotates, the first electrode layer 9 can contact the rubber ring 12 and the friction layer 11, the piezoelectric shell and the piezoelectric sheet 4 form a piezoelectric power generation device, and the roller 8, the first electrode layer 9, the second electrode layer 10 and the friction layer 11 form a friction power generation device. When the piezoelectric-triboelectric hybrid micro fingertip energy collector of this embodiment is used, the rotating wing 5 is driven to rotate by shaking the fingertips, and then the piezoelectric sheet 4 of the piezoelectric shell is moved to vibrate, and the dielectric in the piezoelectric sheet 4 is deformed by the external force in a certain direction, and polarization occurs inside the piezoelectric sheet 4, and at the same time, positive and negative opposite charges appear on the two opposite surfaces of the piezoelectric sheet 4, thereby generating a voltage. When the rotating wing 5 rotates, the friction base 7 is driven to rotate, and the roller 8 located on the friction base 7 rotates along with the rotating wing 5. Since the roller 8 contacts and rubs with the rubber ring 12 on the piezoelectric shell, the roller 8 itself also rotates while the roller 8 rotates, and the first electrode layer 9 located on the roller 8 and the friction layer 11 located on the friction base 7 are periodically frictionally contacted to generate electric charge. When the first electrode layer 9 rotates in and begins to contact and rub with the friction layer 11, positive charges flow from the second electrode layer 10 to the first electrode layer 9 to form a current. Subsequently, the first electrode layer 9 rotates out, and the positive charges located on the first electrode layer 9 begin to flow to the second electrode layer 10, forming a reverse current. This embodiment uses a ring array to install the piezoelectric sheet 4 and the friction power generation device to achieve more electrical energy conversion at a lower speed. This embodiment can solve the self-power supply problem of micro-sized devices, and can convert the mechanical energy generated by the human body into electrical energy for use by micro-sized devices, further expanding the application field of the friction nanogenerator.

[0029] Specifically, in this embodiment, the piezoelectric housing includes a first piezoelectric housing 2 and a second piezoelectric housing 3. The first piezoelectric housing 2 and the second piezoelectric housing 3 are respectively located on both sides of the rotating wing 5 to axially fix the rotating wing 5. A plurality of piezoelectric sheets 4 are circumferentially arranged on both the first piezoelectric housing 2 and the second piezoelectric housing 3. One end of each piezoelectric sheet 4 is fixed to the first piezoelectric housing 2 or the second piezoelectric housing 3 by industrial glue, and the other end of each piezoelectric sheet 4 is used to contact the rotating wing 5.

[0030] In this embodiment, the friction base 7 is located outside the rotating wing 5; rubber rings 12 are provided on the outer sides of both the first piezoelectric housing 2 and the second piezoelectric housing 3, and each rubber ring 12 is respectively located inside the friction base 7.

[0031] In this embodiment, the friction base 7 is connected to the rotating wing 5 by a plurality of support rods 6. Each support rod 6 passes through the gap between the first piezoelectric housing 2 and the second piezoelectric housing 3. One end of each support rod 6 is inserted into the mounting hole of the rotating wing 5, and the other end of each support rod 6 is located in the strip-shaped groove of the friction base 7.

[0032] In this embodiment, a friction end cap 13 is provided on one side of the friction base 7. The strip-shaped protrusions of each friction end cap 13 are located in the corresponding strip-shaped grooves to axially fix the drum 8 and the support rod 6.

[0033] In this embodiment, a plurality of mounting grooves are circumferentially formed on the inner side of the friction base 7. A protruding shaft is provided in each mounting groove. Each drum 8 is respectively sleeved outside a protruding shaft, and the drum 8 and the protruding shaft are rotationally connected by clearance fit, so that the drum 8 can rotate around its axis. A first electrode layer 9 is respectively provided in the groove of each drum 8. A second electrode layer 10 and a friction layer 11 are provided in each mounting groove. The friction layer 11 is provided inside the second electrode layer 10 and one side of the friction layer 11 contacts the second electrode layer 10. The surface of the friction layer 11 in contact with the second electrode layer 10 is provided with a nanostructure or a micro-structure. The nanostructure is a nano-particle or a nano-groove, and the micro-structure is a micro-particle or a micro-groove. The nanostructure or the micro-structure can increase the contact area between the friction layer 11 and the second electrode layer 10, thereby generating more frictional charges on the surface and enhancing the output electric energy.

[0034] In this embodiment, the first electrode layer 9 is made of an aluminum thin film; the second electrode layer 10 is made of a gold thin film; the friction layer 11 is made of polyimide.

[0035] When the user's thumb and middle finger respectively press on the central positions of the first piezoelectric housing 2 and the second piezoelectric housing 3 and shake the piezoelectric-triboelectric hybrid micro fingertip energy harvester of this embodiment, due to the action of gravity, the rotating wing 5 starts to drive the outer ring of the bearing 1 to rotate relative to the inner ring of the bearing 1; when the rotating wing 5 rotates, it toggles the piezoelectric sheets 4 located in the first piezoelectric housing 2 and the second piezoelectric housing 3 to bend and vibrate; the dielectrics inside the piezoelectric sheets 4 are deformed under the action of an external force in a certain direction, polarization occurs inside the piezoelectric sheets 4, and at the same time, positive and negative charges appear on two opposite surfaces of the piezoelectric sheets 4, thus generating a voltage; the rotating wing 5 transfers the rotation to the friction base 7 through the support rod 6, and the roller 8 located on the friction base 7 starts to rotate around the axis of the rotating wing 5 along with the rotating wing 5; the outer side of the roller 8 contacts the rubber ring 12, and during the process of the roller 8 rotating around the axis of the rotating wing 5, a frictional force is generated between the outer side of the roller 8 and the rubber ring 12, prompting the roller 8 to rotate around the protruding shaft on the friction base 7; the first electrode layer 9 located on the roller 8 starts to periodically contact and rub against the friction layer 11, and due to the triboelectric effect, charges are generated; when the first electrode layer 9 rotates in and starts to contact and rub against the friction layer 11, positive charges flow from the second electrode layer 10 to the first electrode layer 9, forming a current; subsequently, the first electrode layer 9 rotates out, and the positive charges located on the first electrode layer 9 start to flow to the second electrode layer 10, forming a reverse current.

[0036] This embodiment is based on the triboelectric effect, the charge separation in the plane period caused by the relative rotational motion between the first electrode layer 9 and the friction layer 11, and the piezoelectric effect, to absorb the mechanical energy generated when the finger is shaken and convert it into electrical energy for subsequent use in micro-devices; this embodiment has a compact structure and a certain degree of adaptability. The faster the finger shakes and the faster the rotating wing 5 rotates, the stronger the electromechanical conversion ability of the triboelectric power generation device and the piezoelectric power generation device will be, and the more electrical energy it outputs and the better the power generation capacity will be, further expanding the application range of the energy collector; this embodiment utilizes the triboelectric effect. When two different materials are rubbed, due to the different electron-accepting abilities of the two materials, equal amounts of opposite charges are generated on their surfaces. As the first electrode layer 9 moves, a potential difference is formed between the first electrode layer 9 and the second electrode layer 10 , the potential difference will drive the charges inside the first electrode layer 9 and the second electrode layer 10 to move in a directional manner, thereby generating current; this embodiment utilizes the piezoelectric effect, when the piezoelectric sheet 4 is moved by the rotating wing 5, the dielectric inside the piezoelectric sheet 4 is deformed by the external force in a certain direction, polarization occurs inside the piezoelectric sheet 4, and at the same time, opposite positive and negative charges appear on the two opposite surfaces of the piezoelectric sheet 4, thereby generating voltage; the surface of the friction layer 11 in contact with the first electrode layer 9 is processed with a nanostructure or a microstructure to increase the contact area, thereby generating more friction charges on the surface and enhancing the output electrical energy; both the friction power generation device and the piezoelectric power generation device adopt a ring array method to achieve more rollers 8 rotating and more piezoelectric sheets 4 vibrating in a unit period when the rotation speed is low, thereby improving the power generation efficiency.

[0037] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A piezoelectric-triboelectric hybrid micro fingertip energy harvester, characterized in that: It includes a rotary wing, a piezoelectric housing, piezoelectric sheets, a friction base, rubber rings, rollers, a first electrode layer, a second electrode layer, and a friction layer; the rotary wing is rotatably connected to the piezoelectric housing, the piezoelectric sheets and the rubber rings are both arranged on the piezoelectric housing, the friction base is connected to the rotary wing, the friction base and the rubber rings rotate relative to each other, the rollers are arranged on the friction base, the rollers can rotate around their axes, the first electrode layer is arranged on the rollers, and the second electrode layer and the friction layer are arranged on the friction base; when the rotary wing and the piezoelectric housing rotate relative to each other, the rotary wing can contact the piezoelectric sheets, and when the rollers rotate, the first electrode layer can contact the rubber rings and the friction layer.

2. The piezoelectric-triboelectric hybrid micro fingertip energy harvester according to claim 1, wherein: The piezoelectric housing includes a first piezoelectric housing and a second piezoelectric housing, the first piezoelectric housing and the second piezoelectric housing are respectively located on both sides of the rotary wing, a plurality of the piezoelectric sheets are arranged along the circumferential direction on both the first piezoelectric housing and the second piezoelectric housing, one end of each piezoelectric sheet is connected to the first piezoelectric housing or the second piezoelectric housing, and the other end of each piezoelectric sheet is used to contact the rotary wing.

3. The piezoelectric-triboelectric hybrid micro fingertip energy harvester according to claim 2, wherein: The friction base is located outside the rotary wing; rubber rings are arranged on the outside of both the first piezoelectric housing and the second piezoelectric housing, and each rubber ring is respectively located inside the friction base.

4. The piezoelectric-triboelectric hybrid micro fingertip energy harvester according to claim 3, wherein: The friction base and the rotary wing are connected by a plurality of support rods, each support rod respectively passes through the gap between the first piezoelectric housing and the second piezoelectric housing, one end of each support rod is connected to the rotary wing, and the other end of each support rod is located in the strip-shaped groove of the friction base.

5. The piezoelectric-triboelectric hybrid micro fingertip energy harvester according to claim 4, characterized in that: A friction end cover is arranged on one side of the friction base, and the strip-shaped protrusions of each friction end cover are respectively located in the corresponding strip-shaped grooves.

6. The piezoelectric-triboelectric hybrid micro fingertip energy harvester according to claim 1, wherein: A plurality of installation grooves are formed along the circumferential direction on the inner side of the friction base, a protruding shaft is arranged in each installation groove, each roller is respectively sleeved outside a protruding shaft, and the roller is rotatably connected to the protruding shaft. A first electrode layer is respectively arranged in the groove of each roller, a second electrode layer and a friction layer are arranged in each installation groove, and the friction layer is arranged inside the second electrode layer and contacts the second electrode layer.

7. The piezoelectric-triboelectric hybrid micro fingertip energy harvester according to claim 1, wherein: The first electrode layer is made of aluminum; the second electrode layer is made of gold; the friction layer is made of polyimide.

8. The piezoelectric-triboelectric hybrid micro fingertip energy harvester according to claim 1, characterized in that: The rotary wing and the piezoelectric housing are rotatably connected by a bearing, the rotary wing is connected to the outer ring of the bearing, and the piezoelectric housing is connected to the inner ring of the bearing.

9. The piezoelectric-triboelectric hybrid micro fingertip energy harvester according to claim 1, wherein: The rotary wing, the piezoelectric housing, the friction base, and the rubber rings are coaxially arranged.

10. The piezoelectric-triboelectric hybrid micro fingertip energy harvester according to claim 1, characterized in that: The surface of the friction layer is provided with a nanostructure or a micro-structure.

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