Continuous vibration energy harvesting device

Abstract

The present invention relates to the technical field of energy harvesting equipment, and provides a continuous vibration energy harvesting device. The continuous vibration energy harvesting device comprises a shell, a coil skeleton is provided inside the shell, and the two ends of the coil skeleton are elastically connected to the shell by springs. A magnet is provided in the coil skeleton, and the two ends of the magnet are fixedly connected to the shell. A first coil and a second coil are wound around the outer sides of the two ends of the coil skeleton, and two piezoelectric film assemblies are provided on opposite sides of the coil skeleton. Each piezoelectric film assembly includes two piezoelectric films arranged at intervals, and the two piezoelectric films are electrically connected to the first coil and the second coil respectively. The continuous vibration energy harvesting device provided by the present invention can combine the piezoelectric effect and the electromagnetic effect to perform vibration energy harvesting, effectively improving the energy conversion efficiency and the power output efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of energy harvesting equipment, and in particular to a continuous vibration energy harvesting device. Background Art

[0002] Currently, there are essentially three main energy sources used for energy harvesting: electromagnetic radiation, thermal energy, and vibration-mechanical energy. Vibration-mechanical energy is the most readily available energy source from the surrounding environment and serves as the primary energy source for ambient energy harvesting. Vibration energy harvesters, as sustainable micropower sources, can convert the widespread mechanical vibration energy present in the system into electrical energy, thereby powering a variety of low-power sensors around the clock.

[0003] Vibration sources in industrial environments primarily originate from motors, including coal miners, tunnel boring machines, loaders, scraper conveyors, emulsion pumps, fans, rock drills, and coal drills. When these motors are operating, they can generate impact vibrations and continuous vibrations due to load fluctuations or manual operation. However, existing continuous vibration energy harvesters can only harvest vibration energy through the piezoelectric effect or the electromagnetic effect, resulting in low energy conversion efficiency and, consequently, low electrical energy output efficiency. Summary of the Invention

[0004] The present invention provides a continuous vibration energy harvesting device that can combine piezoelectric effect and electromagnetic effect to harvest vibration energy, thereby effectively improving energy conversion efficiency and electrical energy output efficiency.

[0005] The present invention provides a continuous vibration energy harvesting device, comprising a shell, wherein a coil skeleton is provided inside the shell, and the two ends of the coil skeleton are elastically connected to the shell through springs; a magnet is provided in the coil skeleton, and the two ends of the magnet are fixedly connected to the shell; a first coil and a second coil are wound around the outer sides of the two ends of the coil skeleton respectively; two piezoelectric film assemblies are provided on opposite sides of the coil skeleton, each of the piezoelectric film assemblies includes two piezoelectric films arranged at intervals, and the two piezoelectric films are electrically connected to the first coil and the second coil respectively.

[0006] According to a continuous vibration energy harvesting device provided by the present invention, the coil skeleton is a hollow cylindrical structure with openings at both ends, and the two ends of the magnetic steel extend to the outside of the coil skeleton through the two openings and are fixedly connected to the inner wall of the shell.

[0007] According to a continuous vibration energy harvesting device provided by the present invention, the spring includes two first springs arranged at the first end of the coil skeleton and two second springs arranged at the second end of the coil skeleton; one end of the two first springs is respectively fixedly connected to the end face of the first end of the coil skeleton, and the other end of the two first springs is respectively fixedly connected to the inner side wall of the shell, and the two first springs are located on opposite sides of the coil skeleton; one end of the two second springs is respectively fixedly connected to the end face of the second end of the coil skeleton, and the other end of the two second springs is respectively fixedly connected to the inner side wall of the shell, and the two second springs are located on opposite sides of the coil skeleton.

[0008] According to a continuous vibration energy harvesting device provided by the present invention, a first coil mounting groove is provided on the outer wall of the coil skeleton at a position close to the first spring, and the first coil is wound and arranged in the first coil mounting groove; a second coil mounting groove is provided on the outer wall of the coil skeleton at a position close to the second spring, and the second coil is wound and arranged in the second coil mounting groove.

[0009] According to the continuous vibration energy harvesting device provided by the present invention, the axis of the magnetic steel coincides with the axis of the coil skeleton; and the expansion and contraction directions of the springs are respectively parallel to the axis directions of the magnetic steel.

[0010] According to a continuous vibration energy harvesting device provided by the present invention, each piezoelectric film assembly is respectively located between the first coil and the second coil; the two piezoelectric films are parallel to each other, and the length extension direction of each piezoelectric film is respectively perpendicular to the axial direction of the magnetic steel.

[0011] According to the continuous vibration energy harvesting device provided by the present invention, the shell is respectively provided with a through hole for each piezoelectric film to pass through.

[0012] According to a continuous vibration energy harvesting device provided by the present invention, the first ends of the two piezoelectric membranes are respectively fixedly connected to the coil skeleton, the second ends of the two piezoelectric membranes respectively extend through the through holes to the outside of the shell, and mass blocks are respectively provided on the side walls facing the second ends of the two piezoelectric membranes.

[0013] According to the continuous vibration energy harvesting device provided by the present invention, the two piezoelectric films are electrically connected to the first coil and the second coil respectively through the first copper wire.

[0014] According to the continuous vibration energy harvesting device provided by the present invention, the housing is further provided with a terminal, and the terminal is electrically connected to the first coil and the second coil respectively through a second copper wire.

[0015] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0016] The continuous vibration energy harvester provided by the present invention comprises a coil bobbin disposed inside a housing, wherein both ends of the coil bobbin are elastically connected to the housing via springs, a magnet is disposed in the coil bobbin, wherein both ends of the magnet extend outside the coil bobbin and are fixedly connected to the housing, a first coil and a second coil are respectively wound around the outer sides of both ends of the coil bobbin, and two piezoelectric film assemblies are disposed on opposite sides of the coil bobbin, each piezoelectric film assembly comprising two spaced-apart piezoelectric films, which are electrically connected to the first coil and the second coil, respectively. When the continuous vibration energy harvester as a whole receives continuous vibration, the magnet moves synchronously with the housing, and since the coil bobbin is elastically connected to the housing via the spring, relative motion occurs between the coil bobbin and the magnet, thereby generating induced currents in the first coil and the second coil, respectively. Simultaneously, since one end of each piezoelectric film is connected to the coil bobbin, each piezoelectric film moves synchronously with the coil bobbin, thereby generating piezoelectric currents in each piezoelectric film. Furthermore, since the piezoelectric film and the coil are connected in series, the continuous vibration energy harvester can output electrical energy. Therefore, the continuous vibration energy harvesting device provided by the present invention has a simple structure and is easy to use. It can meet the needs of use in a continuous vibration environment and can combine the piezoelectric effect and the electromagnetic effect to harvest vibration energy, thereby converting the continuous vibration energy in the environment into electrical energy output. Not only is the electrical energy output stable and reliable, but it also effectively improves the energy conversion efficiency and electrical energy output efficiency.

[0017] When the continuous vibration energy harvesting device provided by the present invention is electrically connected to a low-power sensor, it can provide stable power supply for the low-power sensor, especially meeting the demand of wireless sensors to work for a long time without battery replacement, solving the problem that wireless sensors carry limited battery energy and require a long working cycle, effectively improving the efficiency of wireless sensors in long-term on-site work, and greatly reducing the operation and maintenance costs of wireless sensors. Moreover, since there is no need to use chemical batteries, the environmental pollution problem of batteries is solved, which has important environmental significance.

[0018] The continuous vibration energy harvesting device provided by the present invention can not only be used in environments such as mines and tunnels, but can also be widely used in various industries such as forestry, fire protection, security, smart homes, etc., and has broad market prospects.

[0019] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a structural schematic diagram of the continuous vibration energy harvesting device provided by the present invention.

[0022] Reference numerals:

[0023] 1: Shell; 2: Coil skeleton; 3: Magnetic steel;

[0024] 4: First coil; 5: Second coil; 6: Piezoelectric film assembly;

[0025] 61: first piezoelectric film; 62: second piezoelectric film; 7: first spring;

[0026] 8: Second spring; 9: Mass block. DETAILED DESCRIPTION

[0027] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0028] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0029] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0030] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0031] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0032] The following combination Figure 1 A specific embodiment of the continuous vibration energy harvesting device of the present invention is described.

[0033] The continuous vibration energy harvesting device according to an embodiment of the present invention includes a housing 1, a coil bobbin 2, a magnet 3, a first coil 4, a second coil 5, and two piezoelectric film assemblies 6. The coil bobbin 2 is disposed within the housing 1, and its two ends are elastically connected to the housing 1 via springs. That is, the coil bobbin 2 is capable of moving within the housing 1. The first coil 4 and the second coil 5 are wound around the outside of the two ends of the coil bobbin 2, respectively.

[0034] The magnet 3 is disposed inside the coil bobbin 2 and is not connected to the coil bobbin 2. Both ends of the magnet 3 pass through the coil bobbin 2 and are fixedly connected to the housing 1. In other words, the coil bobbin 2 can move relative to the outside of the magnet 3.

[0035] Two piezoelectric film assemblies 6 are provided on opposite sides of the coil skeleton 2 . Each piezoelectric film assembly 6 includes two piezoelectric films spaced apart from each other. The two piezoelectric films are electrically connected to the first coil 4 and the second coil 5 , respectively.

[0036] During use, when continuous vibration is applied to the continuous vibration energy harvesting device as a whole, the magnet 3 will move synchronously with the shell 1. Since the coil skeleton 2 is elastically connected to the shell 1 through a spring, under the action of the elastic force of the spring, relative movement occurs between the coil skeleton 2 and the magnet 3, thereby generating induced current in the first coil 4 and the second coil 5 respectively; at the same time, since one end of each piezoelectric film is connected to the coil skeleton 2, each piezoelectric film can move synchronously with the coil skeleton 2, thereby generating piezoelectric current in each piezoelectric film; and since the two piezoelectric films in each piezoelectric film assembly 6 are respectively connected in series with the first coil 4 and the second coil 5, the continuous vibration energy harvesting device can output electrical energy.

[0037] Therefore, the continuous vibration energy harvesting device of the embodiment of the present invention has a simple structure and is easy to use. It can meet the needs of use in a continuous vibration environment and can combine the piezoelectric effect and the electromagnetic effect to harvest vibration energy, thereby converting the continuous vibration energy of the environment into electrical energy output. Not only is the electrical energy output stable and reliable, but it also effectively improves the energy conversion efficiency and electrical energy output efficiency.

[0038] Mine environmental monitoring requires sensors. While wireless sensors are available on industrial sites, they are primarily used for short-term monitoring and cannot meet the needs of long-term field monitoring. Battery-powered wireless sensors require periodic battery replacement for extended monitoring. If the sensors are installed in locations that are difficult to replace or move, they will not function properly for extended periods. Furthermore, battery replacement increases operational costs and causes environmental pollution.

[0039] Therefore, when the continuous vibration energy harvesting device of the embodiment of the present invention is electrically connected to a low-power sensor, it can provide stable power supply for the low-power sensor, especially meeting the demand of wireless sensors to work for a long time without replacing batteries, solving the problem that wireless sensors carry limited battery energy and require a long working cycle, effectively improving the work efficiency of wireless sensors in long-term on-site work, and greatly reducing the operation and maintenance costs of wireless sensors. Moreover, since there is no need to use chemical batteries, the environmental pollution problem of batteries is solved, which has important environmental significance.

[0040] Of course, the continuous vibration energy harvesting device according to the embodiment of the present invention may also be electrically connected to other types of low-power electronic components to provide power for the other types of low-power electronic components.

[0041] Specifically, the two piezoelectric films in each piezoelectric film assembly 6 are a first piezoelectric film 61 and a second piezoelectric film 62, wherein the first piezoelectric film 61 is arranged near the first coil 4, and the second piezoelectric film 62 is arranged near the second coil 5. The first piezoelectric film 61 and the second piezoelectric film 62 are electrically connected to the first coil 4 and the second coil 5, respectively, via a first copper wire. That is, the two first piezoelectric films 61 are connected in series with the first coil 4, and the two second piezoelectric films 62 are connected in series with the second coil 5.

[0042] In some embodiments of the present invention, the coil bobbin 2 is a hollow cylindrical structure with two openings at each end. The two ends of the magnet 3 extend through the two openings to the outside of the coil bobbin 2 and are fixedly connected to the inner wall of the housing 1. In other words, the magnet 3 can move synchronously with the housing 1, while the coil bobbin 2 can move relative to the outside of the magnet 3.

[0043] In some embodiments of the present invention, the spring includes two first springs 7 disposed at a first end of the coil bobbin 2 and two second springs 8 disposed at a second end of the coil bobbin 2 .

[0044] One end of the two first springs 7 is fixedly connected to the end surface of the first end of the coil bobbin 2, and the other ends of the two first springs 7 are fixedly connected to the inner side wall of the housing 1. The two first springs 7 are located on opposite sides of the coil bobbin 2. In other words, by providing two first springs 7 at the first end of the coil bobbin 2, the elastic force applied to the first end of the coil bobbin 2 can be made more uniform, ensuring that the coil bobbin 2 is more stable and reliable when moving inside the housing 1.

[0045] One end of each of the two second springs 8 is fixedly connected to the end surface of the second end of the coil bobbin 2, and the other end of each of the two second springs 8 is fixedly connected to the inner wall of the housing 1. The two second springs 8 are located on opposite sides of the coil bobbin 2. In other words, by providing two second springs 8 at the second end of the coil bobbin 2, the elastic force applied to the second end of the coil bobbin 2 is made more uniform, ensuring that the coil bobbin 2 is more stable and reliable when moving inside the housing 1.

[0046] In some embodiments of the present invention, a first coil mounting groove is provided on the outer wall of the coil bobbin 2 near the first spring 7, and the first coil 4 is wound and arranged in the first coil mounting groove, thereby achieving stable and reliable installation of the first coil 4 on the outer side of the coil bobbin 2. A second coil mounting groove is provided on the outer wall of the coil bobbin 2 near the second spring 8, and the second coil 5 is wound and arranged in the second coil mounting groove, thereby achieving stable and reliable installation of the second coil 5 on the outer side of the coil bobbin 2.

[0047] In some embodiments of the present invention, the axis of the magnet 3 coincides with the axis of the coil bobbin 2. The expansion and contraction directions of the springs are parallel to the axis of the magnet 3, thereby ensuring that when the continuous vibration energy harvester as a whole receives continuous vibration, the coil bobbin 2 can achieve relative movement with the magnet 3 under the elastic force of the springs.

[0048] In some embodiments of the present invention, each piezoelectric film assembly 6 is located between the first coil 4 and the second coil 5. The two piezoelectric films in each piezoelectric film assembly 6 are parallel to each other, and the length extension direction of each piezoelectric film is perpendicular to the axis direction of the magnetic steel 3.

[0049] Specifically, the housing 1 is provided with through-holes for each piezoelectric membrane to pass through. The first ends of the two piezoelectric membranes in each piezoelectric membrane assembly 6 are fixedly connected to the coil bobbin 2, and the second ends of the two piezoelectric membranes extend through the through-holes to the outside of the housing 1. Mass blocks 9 are provided on the sidewalls facing the second ends of the two piezoelectric membranes, ensuring that each piezoelectric membrane can move relative to the magnetic steel 3 under the drive of the coil bobbin 2, thereby generating piezoelectric current in each piezoelectric membrane.

[0050] In some embodiments of the present invention, a terminal is further provided on the housing 1, which is electrically connected to the first coil 4 and the second coil 5 via a second copper wire. The terminal is used to connect the power supply line, thereby enabling the continuous vibration energy harvester to be connected to a low-power sensor that requires power.

[0051] In summary, the continuous vibration energy harvester of the present invention has a simple structure, is easy to use, and can meet the needs of continuous vibration environments. It can combine the piezoelectric effect and the electromagnetic effect to harvest vibration energy, thereby converting the environment's continuous vibration energy into electrical energy output. Not only is the electrical energy output stable and reliable, but it also effectively improves the energy conversion efficiency and electrical energy output efficiency. This continuous vibration energy harvester can be used not only in environments such as mines and tunnels, but also in a wide range of industries such as forestry, fire protection, security, and smart homes, and has broad market prospects.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A continuous vibration energy harvesting device, characterized in that: The invention comprises a shell, a coil skeleton is provided inside the shell, and the two ends of the coil skeleton are elastically connected to the shell via springs; a magnet is provided in the coil skeleton, and the two ends of the magnet are fixedly connected to the shell; a first coil and a second coil are wound around the outer sides of the two ends of the coil skeleton; two piezoelectric film assemblies are provided on opposite sides of the coil skeleton, each of the piezoelectric film assemblies includes two piezoelectric films arranged at intervals, and the two piezoelectric films are electrically connected to the first coil and the second coil respectively; The coil frame is a hollow cylindrical structure with two openings at both ends. The two ends of the magnetic steel extend out of the coil frame through the two openings and are fixedly connected to the inner wall of the shell. The spring includes two first springs arranged at the first end of the coil bobbin and two second springs arranged at the second end of the coil bobbin; one end of the two first springs is respectively fixedly connected to the end surface of the first end of the coil bobbin, and the other end of the two first springs is respectively fixedly connected to the inner side wall of the shell, and the two first springs are located on opposite sides of the coil bobbin; one end of the two second springs is respectively fixedly connected to the end surface of the second end of the coil bobbin, and the other end of the two second springs is respectively fixedly connected to the inner side wall of the shell, and the two second springs are located on opposite sides of the coil bobbin; The coil skeleton moves relative to the magnetic steel along the axis of the magnetic steel under the elastic force of the spring; Each of the piezoelectric film assemblies is located between the first coil and the second coil respectively; The two piezoelectric films are parallel to each other, and the length extension direction of each piezoelectric film is perpendicular to the axis direction of the magnetic steel.

2. The continuous vibration energy harvesting device according to claim 1, characterized in that: A first coil mounting groove is provided on the outer wall of the coil skeleton near the first spring, and the first coil is wound and arranged in the first coil mounting groove; a second coil mounting groove is provided on the outer wall of the coil skeleton near the second spring, and the second coil is wound and arranged in the second coil mounting groove.

3. The continuous vibration energy harvesting device according to claim 1 or 2, characterized in that: The axis of the magnetic steel coincides with the axis of the coil frame; the expansion and contraction directions of the springs are respectively parallel to the axis of the magnetic steel.

4. The continuous vibration energy harvesting device according to claim 1 or 2, characterized in that: The shell is respectively provided with a through hole for each piezoelectric film to pass through.

5. The continuous vibration energy harvesting device according to claim 4, characterized in that: The first ends of the two piezoelectric films are fixedly connected to the coil frame respectively, the second ends of the two piezoelectric films respectively pass through the through holes and extend to the outside of the shell, and mass blocks are respectively provided on the side walls facing the second ends of the two piezoelectric films.

6. The continuous vibration energy harvesting device according to claim 1 or 2, characterized in that: The two piezoelectric films are electrically connected to the first coil and the second coil respectively through a first copper wire.

7. The continuous vibration energy harvesting device according to claim 1 or 2, characterized in that: The housing is further provided with a terminal, and the terminal is electrically connected to the first coil and the second coil respectively through a second copper wire.

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