Electromechanical coupling spiral generator

Abstract

The invention provides an electromechanical coupling spiral generator, which comprises a plurality of spiral piezoelectric patches with the same structure, the plurality of spiral piezoelectric patches are overlapped to form a coaxial multi-spiral form, the plurality of spiral piezoelectric patches are close to each other and insulated from each other, the plurality of spiral piezoelectric patches respectively form an inductor, and the plurality of spiral piezoelectric patches are arranged in the coaxial multi-spiral form. The multiple spiral piezoelectric plates are overlapped to form a capacitor, and the inductor and the capacitor form an LC oscillating circuit. The electromechanical coupling spiral generator provided by the invention can enlarge the power generation area, prolong the power generation time, increase the amplitude of alternating current signals and improve the power generation efficiency. The electromechanical coupling spiral generator can be applied to an environment capable of providing continuous vibration, vibration energy is continuously absorbed, electric energy is generated, and electric energy conversion output is achieved.

Description

Technical Field

[0001] The invention relates to a generator, and in particular provides an electromechanical coupling spiral generator. Background Art

[0002] The research on piezoelectric power generation devices has always been the direction of continuous efforts of scientific and technological workers. Piezoelectricity has many forms and wide applications, but it also has some shortcomings. Generally, the effective area of ​​piezoelectric power generation is small, the thickness is large, it is difficult to deform, the vibration time is short, no electromechanical coupling relationship is generated, and the power generation is small. Even if there is a vehicle vibration impact under the roadway, the general piezoelectric power generation device still needs circuit coordination to improve the power generation efficiency and amplitude.

[0003] Therefore, providing a generator with high power generation, high power generation efficiency and large amplitude has become an urgent problem to be solved. Summary of the invention

[0004] In view of this, the present invention provides an electromechanically coupled spiral generator to solve the problems of low power generation, low power generation efficiency and small amplitude of existing generators.

[0005] The present invention provides an electromechanical coupling spiral generator, comprising a plurality of spiral piezoelectric sheets with the same structure, wherein the plurality of spiral piezoelectric sheets overlap to form a coaxial multi-spiral form, the plurality of spiral piezoelectric sheets are close to each other and insulated from each other, the plurality of spiral piezoelectric sheets respectively constitute inductors, the plurality of spiral piezoelectric sheets overlap to form capacitors, and the inductors and capacitors constitute an LC oscillation circuit.

[0006] Preferably, the spiral piezoelectric sheets are all copper spiral piezoelectric sheets with a layer of ceramic power generation material covering the surface.

[0007] Further preferably, the natural frequency of the electromechanically coupled spiral generator coincides with the frequency range of the vibration source.

[0008] The electromechanical coupling spiral generator provided by the present invention, when the spiral piezoelectric sheet resonates under the action of external force vibration, not only generates electric charge, but also realizes capacitance and inductance coupling into an oscillation circuit. The structural characteristics of the spiral piezoelectric sheet can expand the power generation area, extend the power generation time, increase the AC signal amplitude, and improve the power generation efficiency. The electromechanical coupling spiral generator provided by the present invention can be used in an environment that can provide continuous vibration, continuously absorb vibration energy, generate electrical energy, and realize electrical energy conversion output. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a front view of the electromechanical coupling spiral generator provided by the present invention;

[0010] Figure 2 is a top view of the electromechanically coupled spiral generator provided by the present invention;

[0011] Figure 3 It is a schematic diagram of the structure of a single spiral piezoelectric piece;

[0012] Figure 4 It is a circuit principle diagram of the electromechanical coupling spiral generator provided by the present invention;

[0013] Figure 5 It is a schematic diagram of pulse vibration generated by the electromechanical coupling spiral generator provided by the present invention under the action of impact load;

[0014] Figure 6 This is a diagram showing the process of parasitic waves caused by shock waves. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with specific embodiments.

[0016] In order to solve the problems of low power generation, low power generation efficiency and small amplitude of existing generators, such as Figures 1 to 3 As shown, the present invention provides a spiral generator with a large area, a long strain duration, easy to generate resonance and couple mechanical vibration with an oscillation circuit. The spiral generator includes: a plurality of spiral piezoelectric sheets 1 with the same structure, wherein the plurality of spiral piezoelectric sheets 1 overlap to form a coaxial multi-spiral form, the plurality of spiral piezoelectric sheets 1 are close to each other and insulated from each other, the plurality of spiral piezoelectric sheets 1 respectively constitute an inductor L, and the plurality of spiral piezoelectric sheets 1 overlap to form a capacitor C (two large-area metal sheets with a small spacing and insulation constitute a capacitor), and the inductor and the capacitor constitute an LC oscillation circuit (the circuit principle diagram is shown in FIG. 1 ). Figure 4 shown), where Figure 1 A schematic diagram of two spiral piezoelectric sheets is given.

[0017] Preferably, the spiral piezoelectric sheets 1 are all copper spiral piezoelectric sheets with a layer of ceramic power generation material on the surface. Further preferably, the natural frequency of the electromechanically coupled spiral generator coincides with the frequency range of the vibration source, so that the spiral piezoelectric sheets can easily resonate within the frequency range of vibration sources such as wheel loads.

[0018] The spiral generator increases the power generation area (S) by designing the piezoelectric sheet into a spiral form; the spiral piezoelectric sheet is a spiral spring structure, and the vibration force causes the piezoelectric sheet to generate strain and generate electricity. The spiral piezoelectric sheet generates parasitic waves under the action of impact loads, and the parasitic waves reciprocate up and down along the spiral axis, so that the continuous vibration time of the spiral spring is extended, which can increase the single impact force power generation working time (T); when the natural frequency of the spiral generator coincides with the frequency range of the vibration source (such as a vehicle traveling on a road or a bridge) and generates resonance, the strain of the spiral generator increases under the resonance (F), which can increase the power generation capacity; the LC oscillation circuit can generate alternating current under the action of vehicle vibration and further amplify the output signal amplitude at the same time, thereby improving the power generation efficiency.

[0019] Among them, the natural frequency of the spiral piezoelectric sheet can be changed by adjusting the thickness, diameter, pitch, length and other structural parameters of the spiral piezoelectric sheet. By making the natural frequency of the spiral piezoelectric sheet coincide with the vibration frequency band of the vehicle, resonance is easily generated, thereby increasing the strain of the generator sheet.

[0020] Among them, the vibration frequency of the LC oscillation circuit can be changed by adjusting the single-piece area of ​​the spiral piezoelectric film, the number of spiral turns and the pitch. By making the vibration frequency of the LC oscillation circuit and the mechanical vibration frequency in the same range, the amplitude of the AC signal can be amplified, thereby increasing the power generation capacity.

[0021] When the electromechanically coupled spiral generator is subjected to the impact load of the vibration source (vehicle), the spiral generator is instantly subjected to compressive deformation. The pitch of the upper part of the spiral piezoelectric sheet is reduced due to the force. During the elastic force recovery process of the spring, the deformation of the spiral piezoelectric sheet moves from the position with high stiffness to the direction with low stiffness, that is, the compressed pitch segment first moves from top to bottom. When it moves to the bottom of the spiral, since the upper and lower ends of the spiral piezoelectric sheet are fixed to the base and the stiffness of the end is the largest, the compressed pitch segment (parasitic wave) reverses upward at the bottom, and the cycle repeats until the deformation energy is exhausted and gradually stops. During the up and down reciprocating motion of the parasitic wave, the surface of multiple spiral piezoelectric sheets is covered with a layer of ceramic power generation material, and each generates an alternating current due to strain. Since the multiple spiral piezoelectric sheets (inductors) are coaxial, close and insulated, the large-area metal sheets with small spacing and insulation have formed capacitors. The combination of inductance and capacitance forms a typical LC oscillation circuit, which amplifies the amplitude of the AC signal. In this way, AC can be generated and the amplitude can be amplified at the same time under the action of vehicle vibration.

[0022] Figure 5 The schematic diagram of the pulse vibration generated by the electromechanical coupling spiral generator when hit by a hammer is given. The impact force of the spiral generator when hit by a hammer (vibration source) is shown in Figure 5 .1; The spiral generator under the impact force is compressed and deformed, and the pitch of the upper part of the spiral piezoelectric piece is reduced due to the force. Figure 5 .2; During the recovery process of the spring's elastic force, the deformation of the spiral piezoelectric piece moves from the position with greater stiffness to the direction with weaker stiffness, that is, the compressed pitch segment first moves from top to bottom. Figure 5 .3, 5.4; When it moves to the bottom of the spiral, the upper and lower ends of the spiral piezoelectric sheet are fixed to the base and have the maximum rigidity, so the compressed pitch segment (parasitic wave) turns back in the opposite direction at the bottom. Figure 5.5, 5.6. This reciprocating cycle continues until the deformation energy is exhausted and then gradually stops. Under the action of the shock wave generated by the hammer vibration and the parasitic wave caused by it, the reciprocating motion of the spiral generator lasts much longer than the vibration impact caused by the instantaneous blow of the hammer. Therefore, extending the working time of the spiral generator is a factor in improving the power generation efficiency. The two spiral piezoelectric sheets covered with ceramic power generation materials reciprocate under the action of shock waves and parasitic waves, each generating an alternating current due to strain, and the two spiral piezoelectric sheets (inductors) are in a coaxial, close and insulated state to form a capacitor. The combination of inductance and capacitance forms a typical LC oscillation circuit, which amplifies the amplitude of the AC signal, so that AC can be generated and the power can be amplified at the same time under the action of a vibration source.

[0023] Figure 6 The process diagram of the parasitic wave caused by the shock wave is given, such as Figure 6 As shown in Figure 6.1, the amplitude and period of the generator under natural state without vibration source are equal, see Figure 6.1; the upper part of the spiral generator under vibration impact is compressed and deformed after being stressed. It can be seen that after being stressed, the period of the amplitude generated by the upper part becomes smaller, that is, the frequency becomes faster, the number of reciprocating times is large, and the process is short, see Figure 6 .2; After the force is applied, the deformation of the spiral generator moves from the position with greater stiffness to the direction with weaker stiffness, and the amplitude also changes. The spiral generator at the position with greater stiffness gradually returns to its original state, and the amplitude also returns to its original state. When the force gradually moves to the direction with weaker stiffness, the short-period amplitude also moves from top to bottom under the action of the parasitic wave. Figure 6 .3, 6.4; when the force moves to the bottom of the spiral, since the upper and lower ends of the spiral are fixed to the base, the stiffness is the largest. Therefore, the pitch of the compressed section is reversed from the bottom under the action of the parasitic wave, and the short-period amplitude gradually moves upward, as shown in Figure 6 .5.

[0024] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0025] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present application. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An electromechanically coupled spiral generator, characterized in that: include: A plurality of spiral piezoelectric sheets (1) having the same structure, wherein the plurality of spiral piezoelectric sheets (1) overlap to form a coaxial multi-spiral form, the plurality of spiral piezoelectric sheets (1) are close to each other and insulated from each other, the plurality of spiral piezoelectric sheets (1) respectively constitute an inductor, the plurality of spiral piezoelectric sheets (1) overlap to form a capacitor, and the inductor and the capacitor constitute an LC oscillation circuit.

2. The electromechanically coupled spiral generator according to claim 1, characterized in that: The spiral piezoelectric sheets (1) are all copper spiral piezoelectric sheets with a layer of ceramic power generation material covering the surface.

3. The electromechanically coupled spiral generator according to claim 1, characterized in that: The natural frequency of the electromechanically coupled spiral generator coincides with the frequency range of the vibration source.

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