Bistable friction nanometer generator

Abstract

The utility model discloses a bistable friction nanometer generator, which comprises a prism, the prism is fixed at the central position of a bottom plate, a sliding mass block is sleeved on the prism in a sliding manner, a friction film is arranged between the sliding mass block and the prism, and a plurality of flexible copper beams are uniformly distributed in the circumferential direction of the bottom plate. The top of each flexible copper beam is hinged to one end of one rigid beam, the other ends of all the rigid beams are hinged to the sliding mass block, and the rigid beams, the flexible copper beams, the sliding mass block and the prism jointly form a cantilever beam-swing arm structure. According to the utility model, an octopus-like negative stiffness mechanism (cantilever beam-swing arm structure) is designed to obtain a bistable structure, the bistable structure and friction nanometer power generation are combined to obtain a bistable friction nanometer power generator, and the bistable friction nanometer power generator can convert small-amplitude low-speed vibration into large-amplitude high-speed motion response, so that the power generation efficiency is improved. And the low-frequency vibration energy collection efficiency of the friction nano-generator is obviously improved.

Description

Technical Field

[0001] The utility model relates to a nanogenerator, in particular to a bistable friction nanogenerator. Background Art

[0002] With the rapid development of modern science and technology, human life has been greatly facilitated, and the demand for energy has also increased. However, the amount of fossil energy on the earth is limited. As humans continue to exploit and utilize it, the reserves of fossil energy are gradually decreasing. In addition, the uncontrolled and inefficient use of fossil energy has brought about problems such as environmental pollution and global warming. Therefore, people's demand for safe, environmentally clean energy and renewable energy is increasing day by day.

[0003] Compared with non-renewable fossil energy that causes great environmental pollution, green and pollution-free environmental energy has gradually entered people's field of vision. Environmental energy usually includes solar energy, wind energy, water energy, and vibration energy, which have the advantages of large reserves and sustainability. Therefore, the development of new energy supply methods using environmental energy is of great significance to further promote the development of new energy fields.

[0004] Vibration energy is widely distributed in the environment and is an ideal green environmental energy source. Friction nanogenerators convert environmental energy into electrical energy by driving charge transfer through the relative movement of friction layers to form a potential difference. Environmental vibrations can drive the relative movement of friction layers, so friction nanogenerators have excellent prospects in the field of vibration energy capture. However, environmental vibrations have low-frequency characteristics, and traditional friction nanogenerators are difficult to achieve efficient capture of vibration energy under low-frequency excitation. Therefore, how to develop friction nanogenerators with low-frequency vibration energy capture capabilities is still a major challenge in the field of vibration energy capture research. Summary of the invention

[0005] In order to solve the above technical problems, the utility model provides a bistable friction nanogenerator with simple structure and high energy collection efficiency.

[0006] The technical solution of the utility model for solving the above-mentioned problem is: a bistable friction nanogenerator, comprising a prism, a base plate, a rigid beam, a flexible copper beam, a sliding mass block and a friction film, wherein the prism is vertically arranged and its bottom is fixed at the center position of the base plate, the sliding mass block can be slidably mounted on the prism, a friction film is arranged between the sliding mass block and the prism, a plurality of flexible copper beams are evenly distributed around the base plate, the top of each flexible copper beam is hinged to one end of a rigid beam, and the other ends of all the rigid beams are hinged to the sliding mass block, and the rigid beam, the flexible copper beam, the sliding mass block and the prism together constitute a cantilever beam-swing arm structure.

[0007] In the above-mentioned bistable friction nanogenerator, the friction film includes a first copper film, a second copper film and a FEP film, the first copper film is pasted on the inner wall of the sliding mass block, the second copper film is pasted on the outer wall of the prism, and the FEP film is pasted on the second copper film and is located between the first copper film and the second copper film.

[0008] In the above-mentioned bistable friction nanogenerator, an L-shaped base is arranged on the inner side of each flexible copper beam, the horizontal side of the L-shaped base is fixed on the bottom plate, and the vertical side of the L-shaped base is closely attached to the inner side of the flexible copper beam.

[0009] The above-mentioned bistable friction nanogenerator has a groove on the bottom plate for installing the L-shaped base.

[0010] In the above-mentioned bistable friction nanogenerator, the prism is an octagonal prism.

[0011] In the above-mentioned bistable friction nanogenerator, the number of the rigid beams and the number of the flexible copper beams are both eight.

[0012] In the above-mentioned bistable friction nanogenerator, the two ends of the rigid beam are respectively connected to the flexible copper beam and the sliding mass block through hinges.

[0013] The beneficial effects of the utility model are:

[0014] 1. Based on the principle of kinetic energy and potential energy conversion during octopus movement, the utility model designs an octopus-like negative stiffness mechanism (cantilever beam-swing arm structure) to obtain a bistable structure. The bistable structure is combined with friction nanopower generation to obtain a bistable friction nanogenerator, which can convert small-amplitude and low-speed vibrations into large-amplitude and high-speed motion responses, significantly improving the low-frequency vibration energy collection efficiency of the friction nanogenerator.

[0015] 2. Under low-frequency environmental vibration, the system parameters such as the length of the rigid beam and the horizontal spacing of the flexible copper beam can be changed to adjust the height of the potential energy barrier of the bistable structure, thereby broadening the bandwidth of the low-frequency vibration energy collection and enhancing the environmental applicability of the bistable friction nanogenerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 It is a potential energy-displacement curve diagram of the utility model. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] like Figure 1As shown, a bistable friction nanogenerator comprises an octagonal prism 1, a base plate 6, a rigid beam 3, a flexible copper beam 5, a sliding mass block 4 and a friction film, wherein the octagonal prism 1 is vertically arranged and its bottom is fixed at the center of the base plate 6, the sliding mass block 4 can be slidably mounted on the octagonal prism 1, and a friction film is arranged between the sliding mass block 4 and the octagonal prism 1, and 8 flexible copper beams 5 are evenly distributed circumferentially on the base plate 6, the top of each flexible copper beam 5 is hinged to one end of a rigid beam 3, and the other ends of all rigid beams 3 are hinged to the sliding mass block 4, and the two ends of the rigid beam 3 are respectively connected to the flexible copper beam 5 and the sliding mass block 4 by hinges; the rigid beam 3, the flexible copper beam 5, the sliding mass block 4 and the octagonal prism 1 together constitute a cantilever beam-swing arm structure.

[0020] The friction film includes a first copper film, a second copper film and a FEP film, wherein the first copper film is pasted on the inner wall of the sliding mass block 4, the second copper film is pasted on the outer wall of the octagonal prism 1, and the FEP film is pasted on the second copper film and located between the first copper film and the second copper film.

[0021] An L-shaped base 7 is arranged inside each flexible copper beam 5, the horizontal side of the L-shaped base 7 is fixed on the bottom plate 6, and the vertical side of the L-shaped base 7 is close to the inside of the flexible copper beam 5. The bottom plate 6 is provided with a groove for installing the L-shaped base 7.

[0022] The beneficial effect of the utility model is that under low-frequency environmental vibration (small amplitude and low speed), since the bistable mechanical structure has two stable equilibrium points (potential energy wells) and one unstable equilibrium point (potential energy barrier), when the system sliding mass block 4 can cross the unstable equilibrium point, it will make a large-value and high-speed well-to-well motion between the two stable equilibrium points (along the octagonal prism 1), and a large potential difference will be generated between the first copper film and the FEP film, thereby generating a large output voltage. Therefore, the bistable friction nanogenerator can convert small-amplitude and low-speed vibration into a large-scale and high-speed motion response, thereby efficiently collecting low-frequency vibration energy.

[0023] like Figure 2 As shown, Figure 2 is the potential energy-displacement curve of the bistable friction nanogenerator. Figure 2 It can be seen that the generator system has two stable equilibrium points and one unstable equilibrium point. The potential energy difference between the stable equilibrium point and the unstable equilibrium point is the potential energy barrier. When the system can cross the unstable equilibrium point, its motion is a large-scale high-speed well-to-well motion.

[0024] It should be noted that by reducing or increasing the number of flexible copper beams 5, the bistable mechanical mechanism can also be used to achieve efficient collection of low-frequency vibration energy; in addition, a rigid structure is used to replace the flexible copper beam 5, and a flexible structure is used to replace the rigid beam 3, which can also realize the bistable mechanical mechanism and collect low-frequency vibration energy.

Claims

1. A bistable friction nanogenerator, Features: It includes a prism, a base plate, a rigid beam, a flexible copper beam, a sliding mass block and a friction film. The prism is vertically arranged and its bottom is fixed at the center of the base plate. The sliding mass block can be slidably mounted on the prism. A friction film is arranged between the sliding mass block and the prism. A plurality of flexible copper beams are evenly distributed around the base plate. The top of each flexible copper beam is hinged to one end of a rigid beam, and the other ends of all the rigid beams are hinged to the sliding mass block. The rigid beam, the flexible copper beam, the sliding mass block and the prism together constitute a cantilever beam-swing arm structure.

2. The bistable triboelectric nanogenerator according to claim 1, Features: The friction film includes a first copper film, a second copper film and an FEP film, wherein the first copper film is pasted on the inner wall of the sliding mass block, the second copper film is pasted on the outer wall of the prism, and the FEP film is pasted on the second copper film and located between the first copper film and the second copper film.

3. The bistable friction nanogenerator according to claim 1, Features: An L-shaped base is arranged on the inner side of each flexible copper beam, the horizontal side of the L-shaped base is fixed on the bottom plate, and the vertical side of the L-shaped base is closely attached to the inner side of the flexible copper beam.

4. The bistable triboelectric nanogenerator according to claim 3, Features: The bottom plate is provided with a groove for installing the L-shaped base.

5. The bistable triboelectric nanogenerator according to claim 1, Features: The prism is an octagonal prism.

6. The bistable triboelectric nanogenerator according to claim 5, Features: The number of the rigid beams and the number of the flexible copper beams are both eight.

7. The bistable triboelectric nanogenerator according to claim 1, Features: The two ends of the rigid beam are respectively connected to the flexible copper beam and the sliding mass block through hinges.

Images