Quasi-zero stiffness vibration isolation energy harvesting device based on dual-mode friction nanometer power generation

Abstract

The utility model relates to the technical field of energy harvesting, and particularly discloses a quasi-zero stiffness vibration isolation energy harvesting device based on dual-mode friction nanometer power generation, which comprises a quasi-zero stiffness module and a friction nanometer power generation module embedded in the inner side of the quasi-zero stiffness module. The friction nanometer power generation module is composed of a contact-separation type friction nanometer power generation module and a sliding type friction nanometer power generation module, and the contact-separation type friction nanometer power generation module is composed of a first electrode layer, a first friction layer, a second electrode layer and a second friction layer. The sliding type friction nanometer power generation module is composed of a third electrode layer, a third friction layer, a fourth electrode layer and a fourth friction layer. The low-frequency vibration isolator is simple and compact in structural design, good in stability, long in service life, high in energy conversion efficiency, good in output performance, low in cost, friendly to use environment, high in adaptability, wide in use range and beneficial to energy conservation and emission reduction, and has low-frequency vibration isolation performance on the basis of guaranteeing the bearing capacity.

Description

Technical Field

[0001] The utility model relates to the technical field of energy harvesting, in particular to a quasi-zero stiffness vibration isolation energy harvesting device based on dual-mode triboelectric nanogenerator. Background Art

[0002] Vibration refers to the reciprocating, undulating, repetitive, small or finite motion of an object passing through its equilibrium position. There are many types and forms of vibration, which are widespread in nature, engineering and daily life; in most cases, vibration is harmful, which will damage human production and bring many inconveniences and even great harms to life.

[0003] It is very necessary to take vibration isolation measures to reduce or eliminate the adverse effects of vibration; classified according to vibration frequency, vibration can be divided into low-frequency vibration less than 10Hz, medium-frequency vibration of 10-1000Hz and high-frequency vibration above 1000Hz. According to statistics, mechanical vibration is mainly medium-low frequency forced vibration; the stiffness characteristics of traditional linear vibration isolation technology limit the contradiction between vibration isolation frequency and load-bearing capacity, making it inapplicable to low-frequency vibration isolation; the quasi-zero stiffness vibration isolator is a non-linear vibration isolation system that uses the parallel connection of positive and negative stiffness to obtain high static stiffness and low dynamic stiffness; in the static equilibrium state, the system has a large static stiffness, providing good load-bearing capacity; when making small-amplitude vibrations near the static equilibrium position, the dynamic stiffness of the system approaches zero, achieving a lower vibration isolation starting frequency; therefore, the quasi-zero stiffness vibration isolator is a non-linear vibration isolation system with good low-frequency vibration isolation performance on the basis of ensuring load-bearing capacity; it is of great value to study vibration energy harvesting technology to convert harmful vibration energy into usable electrical energy; since almost all machinery and equipment generate vibration during operation, although the single-point energy generated by these vibrations is small, its energy input is stable and widely distributed. Compared with traditional environmental energy such as solar energy and wind energy, vibration energy has a higher power density; at present, vibration energy harvesting methods mainly include electromagnetic, electrostatic, piezoelectric and triboelectric nanogenerator forms, etc.

[0004] However, in the prior art, the structure design of the quasi-zero stiffness vibration isolator is complex, and there is a problem of short service life due to fatigue wear, and there are many deficiencies in electromagnetic and piezoelectric vibration energy harvesting methods. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a quasi-zero stiffness vibration isolation energy harvesting device based on dual-mode triboelectric nanogenerator, aiming to solve the technical problems that the structure design of the quasi-zero stiffness vibration isolator in the prior art is complex, there is a problem of short service life due to fatigue wear, and there are many deficiencies in electromagnetic and piezoelectric vibration energy harvesting methods.

[0006] To achieve the above object, a quasi-zero stiffness vibration isolation and energy harvesting device based on dual-mode triboelectric nanogeneration of the present utility model includes a quasi-zero stiffness module and a triboelectric nanogeneration module. The triboelectric nanogeneration module is embedded inside the quasi-zero stiffness module. The triboelectric nanogeneration module is composed of a contact-separation type triboelectric nanogeneration module and a sliding type triboelectric nanogeneration module, and the ends of the contact-separation type triboelectric nanogeneration module and the sliding type triboelectric nanogeneration module are connected. The contact-separation type triboelectric nanogeneration module is composed of a first electrode layer, a first friction layer, a second electrode layer and a second friction layer, and the first friction layer is in contact with the second friction layer. The sliding type triboelectric nanogeneration module is composed of a third electrode layer, a third friction layer, a fourth electrode layer and a fourth friction layer, and the third friction layer is in contact with the fourth friction layer.

[0007] Among them, the quasi-zero stiffness module includes a bearing platform, a base, a cylindrical helical spring, a height-adjusting gasket, a flat diaphragm spring clamp and a flat diaphragm spring. The flat diaphragm spring clamp is fixedly connected to the base and embedded inside the base. The flat diaphragm spring is fixedly connected to the flat diaphragm spring clamp and embedded inside the flat diaphragm spring clamp. The height-adjusting gasket is embedded inside the base. The cylindrical helical spring is embedded inside the base and is located above the height-adjusting gasket. The bearing platform is embedded inside the base. The first electrode layer and the third electrode layer are respectively arranged on the outer wall of the bearing platform, and the first friction layer and the third friction layer are respectively arranged on one side of the corresponding first electrode layer and third electrode layer. The second electrode layer and the fourth electrode layer are respectively arranged inside the base, and the second friction layer and the fourth friction layer are respectively arranged on one side of the corresponding second electrode layer and fourth electrode layer.

[0008] Among them, the bearing platform includes a table top, a table wall and a support rod. The table wall is fixedly connected to the table top and is located below the table top. One end of the support rod is fixedly connected to the table top and is located below the table top. The other end of the support rod is fixedly connected to the flat diaphragm spring.

[0009] Among them, the friction electric sequences of the first friction layer and the second friction layer are different, and the friction electric sequences of the third friction layer and the fourth friction layer are different.

[0010] The beneficial effects of the quasi-zero stiffness vibration isolation and energy harvesting device based on dual-mode triboelectric nanogeneration of the present utility model are as follows: Quasi-zero stiffness vibration isolation is achieved through the parallel connection of the cylindrical helical spring and the flat diaphragm spring. The structure design is simple and compact, with good stability and long service life. It has low-frequency vibration isolation performance on the basis of ensuring the bearing capacity.

[0011] Based on the contact-separation type triboelectric nanogenerator module, dual-mode triboelectric nanogenerator vibration energy harvesting is achieved. It has a simple structure, good adaptability to random low-frequency mechanical vibration energy, high energy conversion efficiency, good output performance, low cost, and is environmentally friendly in use.

[0012] By combining a quasi-zero stiffness vibration isolator and vibration energy harvesting technology, the dual goals of low-frequency vibration isolation and vibration energy capture are achieved. It has strong adaptability, a wide range of applications, and is conducive to the realization of energy conservation and emission reduction. Brief Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] Figure 1 It is a cross-sectional view of the internal structure of a quasi-zero stiffness vibration isolation and energy harvesting device based on dual-mode triboelectric nanogeneration of the present invention.

[0015] Figure 2 It is a schematic structural diagram of a flat diaphragm spring fixture and a flat diaphragm spring of the present invention.

[0016] Figure 3 It is a cross-sectional view of the structure of the triboelectric nanogenerator module of the present invention.

[0017] Figure 4 It is a schematic diagram of the vibration process of the support rod and the flat diaphragm spring of the present invention.

[0018] Figure 5 It is a schematic diagram of the vibration process of the triboelectric nanogenerator module of the present invention.

[0019] Figure 6 It is a vibration change data diagram of a quasi-zero stiffness vibration isolation and energy harvesting device based on dual-mode triboelectric nanogeneration of the present invention.

[0020] 1 - bearing platform, 2 - contact-separation type triboelectric nanogenerator module, 3 - sliding type triboelectric nanogenerator module, 4 - base, 5 - cylindrical helical spring, 6 - shim, 7 - flat diaphragm spring fixture, 8 - flat diaphragm spring, 101 - table top, 102 - table wall, 103 - support rod, 201 - first electrode layer, 202 - first friction layer, 203 - second electrode layer, 204 - second friction layer, 301 - third electrode layer, 302 - third friction layer, 303 - fourth electrode layer, 304 - fourth friction layer. Detailed Embodiments

[0021] Please refer to Figures 1 to 6 According to the present utility model, a quasi-zero stiffness vibration isolation and energy harvesting device based on dual-mode triboelectric nanogenerator is provided, which includes a quasi-zero stiffness module and a triboelectric nanogenerator module. The triboelectric nanogenerator module is embedded inside the quasi-zero stiffness module. The triboelectric nanogenerator module is composed of a contact-separation type triboelectric nanogenerator module 2 and a sliding type triboelectric nanogenerator module 3, and the ends of the contact-separation type triboelectric nanogenerator module 2 and the sliding type triboelectric nanogenerator module 3 are connected. The contact-separation type triboelectric nanogenerator module 2 is composed of a first electrode layer 201, a first friction layer 202, a second electrode layer 203 and a second friction layer 204, and the first friction layer 202 is in contact with the second friction layer 204. The sliding type triboelectric nanogenerator module 3 is composed of a third electrode layer 301, a third friction layer 302, a fourth electrode layer 303 and a fourth friction layer 304, and the third friction layer 302 is in contact with the fourth friction layer 304.

[0022] Furthermore, the quasi-zero stiffness module includes a bearing platform 1, a base 4, a cylindrical helical spring 5, a shim 6, a flat diaphragm spring fixture 7 and a flat diaphragm spring 8. The flat diaphragm spring fixture 7 is fixedly connected to the base 4 and is embedded inside the base 4. The flat diaphragm spring 8 is fixedly connected to the flat diaphragm spring fixture 7 and is embedded inside the flat diaphragm spring fixture 7. The shim 6 is embedded inside the base 4. The cylindrical helical spring 5 is embedded inside the base 4 and is located above the shim 6. The bearing platform 1 is embedded inside the base 4. The first electrode layer 201 and the third electrode layer 301 are respectively arranged on the outer surface wall of the bearing platform 1, and the first friction layer 202 and the third friction layer 302 are respectively arranged on one side of the corresponding first electrode layer 201 and the third electrode layer 301. The second electrode layer 203 and the fourth electrode layer 303 are respectively arranged inside the base 4, and the second friction layer 204 and the fourth friction layer 304 are respectively arranged on one side of the corresponding second electrode layer 203 and the fourth electrode layer 303.

[0023] Furthermore, the bearing platform 1 includes a table top 101, a table wall 102 and a support rod 103. The table wall 102 is fixedly connected to the table top 101 and is located below the table top 101. One end of the support rod 103 is fixedly connected to the table top 101 and is located below the table top 101. The other end of the support rod 103 is fixedly connected to the flat diaphragm spring 8.

[0024] Furthermore, the triboelectric series of the first friction layer and the second friction layer 204 are different, and the triboelectric series of the third friction layer 302 and the fourth friction layer 304 are different.

[0025] In this embodiment, the first electrode layer 201, the second electrode layer 203, the third electrode layer 301, and the fourth electrode layer 303 are made of copper electrodes. The first friction layer 202 is made of a polyimide film material, the second friction layer 204 is made of a polymethyl methacrylate film material, the third friction layer 302 is made of a polytetrafluoroethylene film material, and the fourth friction layer 304 is made of a nylon film material;

[0026] The implementation process of this embodiment is as Figures 4 to 6 shown;

[0027] The vibration-isolated object mg is placed on the carrier 1, the cylindrical helical spring 5 is compressed, and the support rod 103 moves downward, causing the flat diaphragm spring 8 to undergo a downward concave elastic deformation; the height-adjusting shim 6 is used to adjust the support rod 103 to move upward so that the flat diaphragm spring 8 remains in a horizontal state. At this time, the vibration-isolated object mg is completely supported by the cylindrical helical spring 5, and the system reaches the static equilibrium position x 0 ;

[0028] The system vibrates at the static equilibrium position x 0 to generate a vertical displacement. When a downward vertical displacement x 2 occurs, the support rod 103 moves downward, causing the flat diaphragm spring 8 to undergo a downward concave elastic deformation, and then it returns to the horizontal equilibrium state; when an upward vertical displacement x 1 occurs, the support rod 103 moves upward, causing the flat diaphragm spring 8 to undergo an upward convex elastic deformation, and then it returns to the horizontal equilibrium state. During the vibration process, the dynamic stiffness of the system is close to zero, achieving quasi-zero stiffness vibration isolation;

[0029] The distance between the polyimide film of the first friction layer 202 and the polymethyl methacrylate film of the second friction layer 204 is x 1 in the initial state. During the vibration process, they come into contact and separate. Due to the different electron gain and loss abilities of the two films, the polyimide film generates positive charges and the polymethyl methacrylate film generates negative charges. The potential difference generated in the first electrode layer 201 and the second electrode layer 203 can drive electrons to flow in the external circuit, thereby realizing contact-separation mode triboelectric nanogeneration;

[0030] The third friction layer 302, made of polytetrafluoroethylene film, and the fourth friction layer 304, made of nylon film, come into contact and slide during vibration. Since the electron gain and loss abilities of the two films are different, the nylon film generates positive charges and the polytetrafluoroethylene film generates negative charges. As the sliding progresses, the contact area between the two decreases. Due to electrostatic induction, the potential difference generated in the third electrode layer 301 and the fourth electrode layer 303 can drive electrons to flow in the external circuit, thus realizing sliding-mode triboelectric nanogeneration;

[0031] Finally, vibration energy harvesting is achieved through the contact-separation triboelectric nanogeneration module 2 and the sliding triboelectric nanogeneration module 3;

[0032] Quasi-zero stiffness vibration isolation is achieved by the parallel connection of the cylindrical helical spring 5 and the flat diaphragm spring 8. The structural design is simple and compact, with good stability and long service life. It has low-frequency vibration isolation performance on the basis of ensuring the load-bearing capacity; Based on the contact-separation triboelectric nanogeneration module 2, dual-mode triboelectric nanogeneration vibration energy harvesting is realized. The structure is simple, it has good adaptability to random low-frequency mechanical vibration energy, high energy conversion efficiency, good output performance, low cost, and is environmentally friendly; Combining the quasi-zero stiffness vibration isolator and the vibration energy harvesting technology achieves the dual goals of low-frequency vibration isolation and vibration energy capture, with strong adaptability, wide application range, and is conducive to the realization of energy conservation and emission reduction.

[0033] The above-disclosed is only a preferred embodiment of the present invention. Of course, it cannot be used to limit the scope of the rights of the present invention. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A quasi-zero stiffness vibration isolation energy harvesting device based on dual-mode friction nano-power generation, characterized in that: It includes a quasi-zero stiffness module and a friction nano power generation module, wherein the friction nano power generation module is embedded in the inner side of the quasi-zero stiffness module, and the friction nano power generation module is composed of a contact-separation friction nano power generation module and a sliding friction nano power generation module, and the ends of the contact-separation friction nano power generation module and the sliding friction nano power generation module are connected, the contact-separation friction nano power generation module is composed of a first electrode layer, a first friction layer, a second electrode layer and a second friction layer, and the first friction layer is in contact with the second friction layer, and the sliding friction nano power generation module is composed of a third electrode layer, a third friction layer, a fourth electrode layer and a fourth friction layer, and the third friction layer is in contact with the fourth friction layer.

2. A quasi-zero stiffness vibration isolation and energy harvesting device based on dual-mode friction nano-power generation as claimed in claim 1, characterized in that: The quasi-zero stiffness module includes a bearing platform, a base, a cylindrical coil spring, a height adjustment gasket, a flat diaphragm spring clamp and a flat diaphragm spring, the flat diaphragm spring clamp is fixedly connected to the base and embedded in the interior of the base, the flat diaphragm spring is fixedly connected to the flat diaphragm spring clamp and embedded in the interior of the flat diaphragm spring clamp, the height adjustment gasket is embedded in the interior of the base, the cylindrical coil spring is embedded in the interior of the base, and the cylindrical coil spring is located at the upper end of the height adjustment gasket, the bearing platform is embedded in the interior of the base, the first electrode layer and the third electrode layer are respectively arranged on the outer wall of the bearing platform, and the first friction layer and the third friction layer are respectively arranged on one side of the corresponding first electrode layer and the third electrode layer, the second electrode layer and the fourth electrode layer are respectively arranged on the inner side of the base, and the second friction layer and the fourth friction layer are respectively arranged on one side of the corresponding second electrode layer and the fourth electrode layer.

3. A quasi-zero stiffness vibration isolation and energy harvesting device based on dual-mode friction nano-power generation as claimed in claim 2, characterized in that: The supporting platform includes a table top, a table wall and a support rod, the table wall is fixedly connected to the table top and is located at the lower end of the table top, one end of the support rod is fixedly connected to the table top and is located at the lower end of the table top, and the other end of the support rod is fixedly connected to the flat diaphragm spring.

4. A quasi-zero stiffness vibration isolation and energy harvesting device based on dual-mode friction nano-power generation as claimed in claim 3, characterized in that: The first friction layer and the second friction layer have different triboelectric sequences, and the third friction layer and the fourth friction layer have different triboelectric sequences.

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