A self-excited bidirectional frequency modulation energy harvesting device and a portable electrical appliance

Abstract

The present invention provides a self-excited two-way frequency modulation energy harvesting device and a portable electrical appliance, relating to the technical field of energy harvesting and power generation. The device includes a vertical guide rail, a self-excited driving component, and a two-way cantilever frequency modulation component. The self-excited driving component is slidably disposed on the vertical guide rail along the vertical direction. The two-way cantilever frequency modulation component includes a main frequency modulation cantilever beam and a secondary frequency modulation cantilever beam. The main frequency modulation cantilever beam and the secondary frequency modulation cantilever beam are respectively fixedly disposed on the self-excited driving component and extend towards opposite sides of the self-excited driving component. During the process of the self-excited driving component sliding downward, self-excited vibration can occur. Power generation components are provided on both the main frequency modulation cantilever beam and the secondary frequency modulation cantilever beam, and the power generation components can generate electricity when the main frequency modulation cantilever beam and the secondary frequency modulation cantilever beam vibrate self-excitedly. The device provided by the present invention has a simple structure, stable power generation, can realize self-excited vibration frequency up-conversion, and improves the power generation efficiency through two-way power generation.

Description

Technical Field

[0001] The present invention relates to the technical field of energy harvesting and power generation, and particularly to a self-excited bidirectional frequency modulation energy harvesting device and a portable electrical appliance. Background Art

[0002] Currently, the energy issue has attracted increasing attention from all walks of life. With the emergence of various problems in fossil fuels such as oil and coal, and the rapid development of electronic devices, it has become an urgent task to develop alternative energy sources. Electronic devices being able to function as portable devices independently and having the requirement of self-driving and self-power supply has become the main development trend of electronic devices. Obtaining energy from the environment such as wind, light, and vibration has become an increasingly common method. However, using the energy in wind and light for power generation is neither stable nor efficient. Based on this, it is urgent to use vibration for stable and efficient power generation. Summary of the Invention

[0003] The purpose of the present invention is to provide a self-excited bidirectional frequency modulation energy harvesting device and a portable electrical appliance to solve the problems existing in the above-mentioned prior art, with a simple structure, stable power generation, capable of achieving self-excited vibration frequency up-conversion, and improving the power generation efficiency through bidirectional power generation.

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

[0005] The present invention provides a self-excited bidirectional frequency modulation energy harvesting device, including a vertical guide rail, a self-excited driving component, and a bidirectional cantilever frequency modulation component. The self-excited driving component is slidably arranged on the vertical guide rail along the vertical direction; the bidirectional cantilever frequency modulation component includes a main frequency modulation cantilever beam and a secondary frequency modulation cantilever beam. The main frequency modulation cantilever beam and the secondary frequency modulation cantilever beam are respectively fixedly arranged on the self-excited driving component and extend towards opposite sides of the self-excited driving component. During the process of the self-excited driving component sliding downward, self-excited vibration can occur. Power generation components are arranged on both the main frequency modulation cantilever beam and the secondary frequency modulation cantilever beam, and the power generation components can generate electricity when the main frequency modulation cantilever beam and the secondary frequency modulation cantilever beam vibrate self-excitedly.

[0006] Preferably, the two power generation components are respectively a sliding friction power generation component and a piezoelectric power generation component, and the sliding friction power generation component is arranged on the main frequency modulation cantilever beam.

[0007] Preferably, the self-excited driving component includes a sliding sleeve. A first sliding hole that penetrates up and down is arranged on the sliding sleeve. The diameter of the first sliding hole is 105% - 110% of the diameter of the vertical guide rail. The sliding sleeve is slidably connected to the vertical guide rail through the first sliding hole, and the main frequency modulation cantilever beam and the secondary frequency modulation cantilever beam are respectively fixedly arranged on the sliding sleeve.

[0008] Preferably, both the main frequency-modulating cantilever beam and the secondary frequency-modulating cantilever beam are sheet-shaped. The sliding sleeve includes an upper sleeve and a lower sleeve. The ends of the main frequency-modulating cantilever beam and the secondary frequency-modulating cantilever beam are clamped and fixed by the upper sleeve and the lower sleeve. Second sliding holes with the same size and coaxiality as the first sliding hole are provided on both the main frequency-modulating cantilever beam and the secondary frequency-modulating cantilever beam. The main frequency-modulating cantilever beam and the secondary frequency-modulating cantilever beam are slidably arranged on the vertical guide rail through the second sliding holes.

[0009] Preferably, the sliding friction power generation assembly includes a support slide and a friction block. The support slide is fixedly arranged at one end of the main frequency-modulating cantilever beam away from the self-excited driving component. The friction block is slidably arranged on the support slide along the direction away from and close to the self-excited driving component. A first electrode surface is arranged on one side of the support slide facing the friction block. A second electrode surface is arranged on one side of the friction block facing the support slide. The first electrode surface and the second electrode surface are in sliding contact, and the friction block drives the second electrode surface to slide on the first electrode surface.

[0010] Preferably, it further includes a transverse guide rail. The transverse guide rail is fixedly arranged on the main frequency-modulating cantilever beam. The friction block is slidably connected to the transverse guide rail.

[0011] It further includes two limit blocks and two springs. The two limit blocks are respectively fixedly arranged on both sides of the sliding direction of the friction block. The two springs are respectively sleeved on the transverse guide rail and are respectively located on both sides of the friction block. The two springs are respectively located between the two limit blocks and the friction block.

[0012] Preferably, a mass block is fixedly connected to one end of the secondary frequency-modulating cantilever beam away from the self-excited driving component. The mass of the mass block is not greater than one-third of the total mass of the sliding friction power generation assembly. The piezoelectric power generation assembly is arranged on the secondary frequency-modulating cantilever beam between the mass block and the self-excited driving component. The piezoelectric power generation assembly is made of piezoelectric material.

[0013] Preferably, the main frequency-modulating cantilever beam and the secondary frequency-modulating cantilever beam have the same stiffness.

[0014] The present invention also provides a portable electrical appliance, which is characterized in that it includes the self-excited bidirectional frequency-modulating energy harvesting device as described above.

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

[0016] 1. The self-excited bidirectional frequency-modulating energy harvesting device has two power generation components and has high power generation efficiency.

[0017] 2. The natural frequencies of the upper cantilever beams of the two main frequency-modulating cantilever beams and the secondary frequency-modulating cantilever beam are the same. Under the action of gravity, different loads can cause the device to achieve asynchronous self-excited resonance, thereby achieving frequency up-conversion.

[0018] 3. Simple structure and easy adjustment of dimensions.

[0019] 4. Hybrid power generation is carried out using a sliding friction power generation component and a piezoelectric power generation component, achieving double power generation efficiency.

[0020] 5. Facilitates charging the battery of portable electrical appliances. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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 embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 FIG. is a three-dimensional structural schematic diagram of a self-excited bidirectional frequency-modulating energy harvesting device provided for Embodiment 1;

[0023] Figure 2 FIG. is a structural schematic diagram of a sliding friction power generation component and two limit blocks;

[0024] Figure 3 FIG. is an exploded view of the sliding friction power generation component;

[0025] Figure 4 FIG. is a structural schematic diagram of a piezoelectric power generation component disposed on a secondary frequency-modulating cantilever beam;

[0026] In the figure: 1 - self-excited bidirectional frequency-modulating energy harvesting device; 2 - stable frame; 3 - self-excited driving component; 4 - bidirectional cantilever frequency-modulating component; 5 - connecting plate; 6 - mass block; 7 - secondary frequency-modulating cantilever beam; 8 - vertical guide rail; 9 - upper sleeve; 10 - lower sleeve; 11 - main frequency-modulating cantilever beam; 12 - limit block; 13 - friction block; 14 - support slide; 15 - spring; 16 - transverse guide rail; 17 - second electrode surface; 18 - first electrode surface; 20 - piezoelectric power generation component. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0028] The object of the present invention is to provide a self-excited two-way frequency modulation energy harvesting device and a portable electrical appliance, so as to solve the problems existing in the above-mentioned prior art, with a simple structure, stable power generation, capable of realizing self-excited vibration frequency up-conversion, and improving the power generation efficiency through two-way power generation.

[0029] 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 embodiments.

[0030] Embodiment 1

[0031] This embodiment provides a self-excited two-way frequency modulation energy harvesting device 1, as Figures 1 to 4 shown, which includes a vertical guide rail 8, a self-excited driving component 3 and a two-way cantilever frequency modulation component 4. In order to facilitate the vertical setting of the vertical guide rail 8, the vertical guide rail 8 is fixedly arranged in a stable frame 2. The stable frame 2 includes a top plate, a bottom plate and a connecting plate 5. The vertical guide rail 8 is fixedly arranged on the top plate and the bottom plate. The connecting plate 5 is used to connect the top plate and the bottom plate. The vertical guide rail 8 is fixed at both ends of the stable frame 2 through nuts respectively. The bottom plate maintains the stability of the device and prevents the device from shaking due to vibration during the self-excited vibration process. The self-excited driving component 3 is slidably arranged on the vertical guide rail 8 along the vertical direction; the two-way cantilever frequency modulation component 4 includes a main frequency modulation cantilever beam 11 and a secondary frequency modulation cantilever beam 7. The main frequency modulation cantilever beam 11 and the secondary frequency modulation cantilever beam 7 are respectively fixedly arranged on the self-excited driving component 3 and extend towards the opposite sides of the self-excited driving component 3. During the downward sliding process of the self-excited driving component 3, self-excited vibration can occur. Power generation components are arranged on both the main frequency modulation cantilever beam 11 and the secondary frequency modulation cantilever beam 7. The power generation components can be sliding friction power generation components and piezoelectric power generation components 20; when the main frequency modulation cantilever beam 11 and the secondary frequency modulation cantilever beam 7 vibrate self-excitedly, the power generation components can generate electricity.

[0032] When power generation is required, the self-excited driving component 3 and the main frequency modulation cantilever beam 11 and the secondary frequency modulation cantilever beam 7 thereon are lifted to the top of the vertical guide rail 8 and released. Then, the self-excited driving component 3 drives the main frequency modulation cantilever beam 11 and the secondary frequency modulation cantilever beam 7 to perform self-excited vibration and make the power generation components generate electricity. The self-excited two-way frequency modulation energy harvesting device 1 provided in this embodiment has two power generation components and has a high power generation efficiency.

[0033] In a specific embodiment, the two power generation components are respectively a sliding friction power generation component and a piezoelectric power generation component 20. The sliding friction power generation component and the piezoelectric power generation component 20 can generate electricity when vibrating. The sliding friction power generation component is arranged on the main frequency modulation cantilever beam 11.

[0034] In a specific embodiment, the self-excitation driving component 3 includes a sliding sleeve. A first sliding hole penetrating vertically is provided on the sliding sleeve. The diameter of the first sliding hole is 105% to 110% of the diameter of the vertical guide rail 8 to achieve self-excited vibration. The sliding sleeve is slidably connected to the vertical guide rail 8 through the first sliding hole. The main frequency-modulating cantilever beam 11 and the secondary frequency-modulating cantilever beam 7 are respectively fixedly arranged on the sliding sleeve, so that the self-excitation driving component 3 can be inclined and attached to the vertical guide rail 8 due to different weights on both sides to generate self-excited vibration.

[0035] In a specific embodiment, both the main frequency-modulating cantilever beam 11 and the secondary frequency-modulating cantilever beam 7 are sheet-shaped. The sliding sleeve includes an upper sleeve 9 and a lower sleeve 10. The ends of the main frequency-modulating cantilever beam 11 and the secondary frequency-modulating cantilever beam 7 are clamped and fixed by the upper sleeve 9 and the lower sleeve 10. Second sliding holes having the same size and the same axis as the first sliding hole are provided on both the main frequency-modulating cantilever beam 11 and the secondary frequency-modulating cantilever beam 7. The main frequency-modulating cantilever beam 11 and the secondary frequency-modulating cantilever beam 7 are slidably arranged on the vertical guide rail 8 through the second sliding holes.

[0036] In a specific embodiment, the sliding friction power generation assembly includes a support slide 14 and a friction block 13. The support slide 14 is fixedly arranged at one end of the main frequency-modulating cantilever beam 11 away from the self-excitation driving component 3. The friction block 13 is slidably arranged on the support slide 14 along the direction away from and close to the self-excitation driving component 3. A first electrode surface 18 is provided on one side of the support slide 14 facing the friction block 13. A second electrode surface 17 is provided on one side of the friction block 13 facing the support slide 14. The first electrode surface 18 and the second electrode surface 17 are in sliding contact, and the friction block 13 drives the second electrode surface 17 to slide on the first electrode surface 18.

[0037] In a specific embodiment, a transverse guide rail 16 is further included. The transverse guide rail 16 is fixedly arranged on the main frequency-modulating cantilever beam 11. The friction block 13 is slidably connected to the transverse guide rail 16.

[0038] Two limit blocks 12 and two springs 15 are further included. The two limit blocks 12 are respectively fixedly arranged on both sides of the sliding direction of the friction block 13. The two springs 15 are respectively sleeved on the transverse guide rail 16 and are respectively located on both sides of the friction block 13. The two springs 15 are respectively located between the two limit blocks 12 and the friction block 13. Setting the springs 15 can improve the frequency and stability of frictional sliding.

[0039] U-shaped grooves are provided on both the two limit blocks 12. Both sides of the transverse guide rail 16 are fixed in the U-shaped grooves by nuts. The two electrode surfaces are respectively a friction cathode and a friction anode. After the two electrode surfaces generate frictional charges, polarization generates an electrostatic field.

[0040] In a specific embodiment, a mass block 6 is fixedly connected to one end of the secondary frequency modulation cantilever beam 7 away from the self-excited driving component 3. The mass of the mass block 6 is not greater than one-third of the total mass of the sliding friction power generation assembly, ensuring that the main frequency modulation and the secondary frequency modulation have different weights and do not affect the occurrence of self-excited vibration. A piezoelectric power generation assembly 20 is arranged on the secondary frequency modulation cantilever beam 7 between the mass block 6 and the self-excited driving component 3. The piezoelectric power generation assembly 20 is made of piezoelectric material, and the piezoelectric material will generate electricity due to internal deformation caused by high-frequency pitching vibration.

[0041] In a specific embodiment, the main frequency modulation cantilever beam 11 and the secondary frequency modulation cantilever beam 7 have the same stiffness. Setting the same stiffness can ensure that both ends have the same natural frequency, enabling the entire device to resonate at the same natural frequency and maximizing the utilization of self-excited resonance vibration in frequency up-conversion.

[0042] The usage process of this device is as follows:

[0043] The starting position of the self-excited driving component 3 is at the top of the vertical guide rail 8. The self-excited driving component 3 will be deflected to one side of the main frequency modulation cantilever beam 11. After being externally excited, the self-excited driving component 3 will continuously perform repeated motions of sliding - adhering - free falling under the induction of gravity. The bidirectional cantilever frequency modulation component 4 will reach its natural frequency and oscillate at a high frequency, and the entire device will resonate. The friction block 13 will slide with high-frequency pitching vibration after the frequency up-conversion of the main frequency modulation cantilever beam 11. The piezoelectric material on the secondary frequency modulation cantilever beam 7 will generate electricity due to its high-frequency pitching vibration, and the device will achieve bidirectional frequency modulation hybrid power generation.

[0044] In this embodiment, the gravity of the power generation assembly itself is used as the continuous energy source for the vibration of the device. The bidirectional frequency up-conversion is completed through the cantilever beam. The frequency up-conversion frequency depends on the natural frequency of the cantilever beam. In the present invention, the main frequency modulation cantilever beam 11 utilizes the sliding contact friction between the friction cathode and the friction anode materials. After friction charges are generated on the two surfaces, polarization occurs to generate an electrostatic field; the secondary frequency modulation cantilever beam 7 generates electricity by using the internal deformation of the piezoelectric material. The device size and the power generation stroke can be adjusted according to the application scenario, which is simple and convenient. The bidirectional frequency up-conversion makes full use of the high-frequency vibration of self-excited oscillation, and the hybrid power generation can produce stable and high-power power generation output.

[0045] Embodiment 2

[0046] This embodiment also provides a portable electrical appliance, which is characterized in that it includes the self-excited bidirectional frequency modulation energy harvesting device 1 described in Embodiment 1.

[0047] The self-excited bidirectional frequency modulation energy harvesting device 1 is used to charge the battery in the portable electrical appliance and is suitable for outdoor occasions.

[0048] The portable electrical appliance provided in this embodiment has all the advantages of Embodiment 1 and will not be elaborated here.

[0049] In the present invention, specific examples are used to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. A self-excited bidirectional frequency modulation energy harvesting device, characterized in that: It includes a vertical guide rail, a self-excited driving component, and a bidirectional cantilever frequency modulation component. The self-excited driving component is slidably arranged on the vertical guide rail along the vertical direction. The bidirectional cantilever frequency modulation component includes a main frequency modulation cantilever beam and a secondary frequency modulation cantilever beam. The main frequency modulation cantilever beam and the secondary frequency modulation cantilever beam are respectively fixedly arranged on the self-excited driving component and extend towards the opposite sides of the self-excited driving component. During the process of the self-excited driving component sliding downward, self-excited vibration can occur. Power generation components are arranged on both the main frequency modulation cantilever beam and the secondary frequency modulation cantilever beam. When the main frequency modulation cantilever beam and the secondary frequency modulation cantilever beam vibrate self-excitedly, the power generation components can generate electricity.

2. The self-excited bidirectional frequency modulation energy harvesting device according to claim 1, characterized in that: The two power generation components are respectively a sliding friction power generation component and a piezoelectric power generation component. The sliding friction power generation component is arranged on the main frequency modulation cantilever beam.

3. The self-excited bidirectional frequency modulation energy harvesting device according to claim 1, characterized in that: The self-excited driving component includes a sliding sleeve. A first sliding hole that penetrates up and down is arranged on the sliding sleeve. The diameter of the first sliding hole is 105% - 110% of the diameter of the vertical guide rail. The sliding sleeve is slidably connected to the vertical guide rail through the first sliding hole. The main frequency modulation cantilever beam and the secondary frequency modulation cantilever beam are respectively fixedly arranged on the sliding sleeve.

4. The self-excited bidirectional frequency modulation energy harvesting device according to claim 3, characterized in that: Both the main frequency modulation cantilever beam and the secondary frequency modulation cantilever beam are in sheet form. The sliding sleeve includes an upper sleeve and a lower sleeve. The ends of the main frequency modulation cantilever beam and the secondary frequency modulation cantilever beam are clamped and fixed by the upper sleeve and the lower sleeve. Second sliding holes with the same size and coaxial with the first sliding hole are arranged on both the main frequency modulation cantilever beam and the secondary frequency modulation cantilever beam. The main frequency modulation cantilever beam and the secondary frequency modulation cantilever beam are slidably arranged on the vertical guide rail through the second sliding holes.

5. The self-excited bidirectional frequency modulation energy harvesting device according to claim 2, characterized in that: The sliding friction power generation component includes a support slide and a friction block. The support slide is fixedly arranged at one end of the main frequency modulation cantilever beam away from the self-excited driving component. The friction block is slidably arranged on the support slide along the direction away from and towards the self-excited driving component. A first electrode surface is arranged on one side of the support slide facing the friction block. A second electrode surface is arranged on one side of the friction block facing the support slide. The first electrode surface and the second electrode surface are in sliding contact. The friction block drives the second electrode surface to slide on the first electrode surface.

6. The self-excited bidirectional frequency modulation energy harvesting device according to claim 5, characterized in that: It further includes a horizontal guide rail. The horizontal guide rail is fixedly arranged on the main frequency modulation cantilever beam. The friction block is slidably connected to the horizontal guide rail. It further includes two limit blocks and two springs. The two limit blocks are respectively fixedly arranged on both sides of the sliding direction of the friction block. The two springs are respectively sleeved on the horizontal guide rail and are respectively located on both sides of the friction block. The two springs are respectively located between the two limit blocks and the friction block.

7. The self-excited bidirectional frequency modulation energy harvesting device according to claim 5, characterized in that: One end of the secondary frequency modulation cantilever beam away from the self-excited driving component is fixedly connected with a mass block, the mass of the mass block is not greater than one-third of the total mass of the sliding friction power generation assembly, and the piezoelectric power generation assembly is arranged on the secondary frequency modulation cantilever beam between the mass block and the self-excited driving component, and the piezoelectric power generation assembly is made of piezoelectric material.

8. The self-excited bidirectional frequency modulation energy harvesting device according to claim 1, characterized in that: The primary frequency modulation cantilever beam has the same stiffness as the secondary frequency modulation cantilever beam.

9. A portable electrical appliance, characterized in that: It includes the self-excited bidirectional frequency modulation energy harvesting device according to any one of claims 1 to 8.

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