CN108258934A - A kind of bistable state piezoelectricity-electromagnetic power generation apparatus using fluids within pipes kinetic energy - Google Patents

Abstract

The invention discloses a kind of bistable state piezoelectricity electromagnetic power generation apparatus using fluids within pipes kinetic energy, structure mainly includes：Fluid line, shell, bistable state piezoelectric element, coil, impeller assembly, fixing axle, prisoner's energy circuit.Impeller is equipped among fluid line, impeller is fixed on fluid line inner wall by fixed link, and impeller is equipped with 4 magnet pieces.Fluid line outer surface is equipped with multiturn wire coil, and coil both sides are connect with prisoner's energy circuit；Shell, to be fixedly connected, is equipped with upper and lower two bistable state piezoelectric elements with fluid line between fluid line and shell, flexible piezoelectric member MFC, MFC the two poles of the earth are connect with prisoner's energy circuit, and piezoelectric element is fixedly mounted on the boss of housing；The kinetic energy of pipeline fluid is converted into electric energy by the present invention using piezoelectric element and electromagnetic component, and pipeline is without trepanning, electrification component and fluid isolation, no leakage, danger of hazardous electrical discharges；It is simple in structure, generating effect is good with reference to two kinds of generation modes of piezoelectricity and electromagnetism.

Description

A Bistable Piezoelectric-Electromagnetic Power Generation Device Using Fluid Kinetic Energy in Pipeline

Technical field:

The invention relates to the technical fields of energy recovery and new energy, in particular to a bistable piezoelectric-electromagnetic power generation device utilizing fluid kinetic energy in a pipeline.

Background technique:

In recent years, with the rapid progress of science and technology and the rapid development of society and economy, the problem of energy shortage has gradually become prominent. At the same time, environmental pollution caused by energy application has become a common problem that plagues the world. For this reason, relevant scientific researchers are constantly exploring clean new energy sources. For example, the power generation and utilization of wind energy and the power generation and utilization of vibration energy have been explored. In terms of power generation and utilization of vibration energy, there are currently three main types of piezoelectric vibration power generation technology, electromagnetic vibration power generation technology and electrostatic vibration power generation technology. Outstanding features such as continuous energy supply under conditions and easy integration with modern micro-electromechanical products have attracted attention from all walks of life.

Fluid is a general term for gas and liquid, and air and water are the most common fluids. In daily life and production activities, fluids are transported and used in various pipelines. It is of great practical significance to rationally recycle the kinetic energy of the fluid to generate power for low-power electronic components. Some pipeline power generation devices that have appeared at present, such as the "common water inlet pipe water flow power generation device" invented by Song Qiuhong of Shanghai Ocean University with application number 201320309273.5, and the "power generation water pipe" invented by Zhang Li with application number 201410793559.4. Both adopt the method of punching holes in the side wall of the pipeline to derive the motion of the impeller rotating shaft, and then drive the electromagnetic generator to generate electricity, destroying the integrity of the original pipeline. It is easy to cause the danger of fluid leakage or even electric leakage, so this structure cannot be applied to situations where the fluid is flammable, toxic or has strict requirements on airtightness. Application No. 201610748586.9 "A bistable piezoelectric multi-directional fluid energy collection device" proposed by Deng Huaxia of Hefei University of Technology and others uses a bistable flexible piezoelectric sheet to collect fluid kinetic energy, with a simple structure and good power generation effect. However, due to the limitation of its flexible cantilever beam power generation structure, the frequency of the output voltage signal is low, and the phenomenon of "lockup" may occur when the fluid velocity is fast: the piezoelectric sheet is locked by the pressure of the fluid flow and cannot move, and stable power generation cannot be performed.

Invention content:

In view of the above problems, the present invention proposes a bistable piezoelectric-electromagnetic power generation device utilizing the kinetic energy of the fluid in the pipeline, which is used to collect the kinetic energy of the fluid in the pipeline in production and life. Improve the existing pipeline fluid power generation device, which destroys the original pipeline, and has the defects of leakage of liquid and electricity, and uses the combination of bistable piezoelectric power generation components and coils to improve the power generation effect. The power generating device can supply power for low-power detection and monitoring electronic components that are not convenient to replace the power supply.

The present invention is realized through the following technical solutions:

A bistable piezoelectric-electromagnetic power generation device using fluid kinetic energy in a pipeline, characterized in that the structure includes: a fluid pipeline, a casing, a bistable piezoelectric assembly, a coil, an impeller assembly, a fixed rod, and an energy harvesting circuit. The outer surface of the fluid pipeline is also provided with a multi-turn metal coil, and the two ends of the coil are connected to the energy harvesting circuit; the inner center of the fluid pipeline is provided with an impeller, and the impeller is pressed against the inner wall of the fluid pipeline through a fixed shaft. With an even number of magnet blocks, the impeller can rotate freely around a fixed shaft under the push of the fluid; the casing and the fluid pipeline are fixedly connected, and two bistable piezoelectric components are arranged between the fluid pipeline and the casing, and the flexible piezoelectric element For the MFC, the two poles of the MFC are connected to the energy harvesting circuit, and the piezoelectric component is fixedly installed on the boss of the housing. When the impeller rotates, the magnet block arranged on the outer periphery of the impeller rotates accordingly to cause a change in the magnetic field, the coil cuts the magnetic induction line to generate current, and at the same time the bistable piezoelectric component switches between the first and second stable states, and the MFC deforms to generate electric energy; Threads are provided at the front and rear interfaces of the fluid pipeline, which can be tightly connected with external pipelines;

The impeller adjusts the tightening knob on the fixed shaft so that the fixed shaft presses both ends of the inner wall of the fluid pipeline, thereby fixing the impeller at the center position inside the fluid pipeline without opening holes on the side wall of the fluid pipeline.

The impeller is evenly arranged with an even number of magnet blocks along the outer circumference, and the directions of magnetic poles of adjacent magnet blocks are opposite.

The bistable piezoelectric assemblies are arranged one above and below the fluid pipeline, and the magnetic poles of the magnet blocks on the piezoelectric assemblies are in the same direction, with N poles facing the impeller.

The interior of the fluid pipeline of the present invention is the space where the actual fluid flows. The piezoelectric power generation component and the metal coil are arranged in the space between the casing and the fluid pipeline, and are isolated from the fluid inside the fluid pipeline, so that no fluid leakage or electric leakage occurs. The substrates at both ends of the bistable piezoelectric component are fixed by the bumps on the casing, and the magnet blocks on the piezoelectric component and the magnet blocks of the impeller are kept at a proper distance to ensure that the piezoelectric component can be in the first stable state and the second stable state. Smooth switching between two stable states. The impeller is provided with a fixed shaft through the middle position, and the length of the fixed shaft is adjusted by rotating the tightening knob on the fixed shaft, so that both ends of the fixed shaft are pressed against the inner wall of the fluid pipeline, and then the impeller is fixed without damaging the pipeline.

Beneficial effects of the present invention:

The invention proposes a bistable piezoelectric-electromagnetic power generation device that utilizes fluid kinetic energy in the pipeline. The impeller is fixed to the inner wall of the pipeline by adjusting the tightening knob to change the length of the fixed shaft, without destroying the structure of the original pipeline and without fluid leakage. Or leakage phenomenon, which can be applied to energy harvesting and utilization under special circumstances such as fluid poisonous, volatile, flammable, etc.; the combination of two power generation methods of bistable piezoelectric components and metal coils improves the energy harvesting capacity and the power generation effect is good.

Description of drawings:

Fig. 1 is three-dimensional axonometric drawing of the present invention

Fig. 2 is the front view of the present invention along the pipeline direction

Fig. 3 is the three-dimensional axonometric view of the piezoelectric-electromagnetic power generation assembly of the present invention

1-fluid pipeline, 2-housing, 3-bistable piezoelectric assembly, 4-coil, 5-impeller assembly, 6-fixed rod, 7-energy harvesting circuit

Detailed ways:

In order to make the purpose and technical solution of the present invention clearer, the present invention will now be further described in detail in conjunction with the accompanying drawings.

As shown in accompanying drawing 1, a bistable piezoelectric-electromagnetic power generation device utilizing fluid kinetic energy in the pipeline according to the present invention, the main structure includes: a fluid pipeline (1), a casing (2), a bistable piezoelectric Assembly (3), coil (4), impeller assembly (5), fixed rod (6), energy harvesting circuit (7). The inner center of the fluid pipeline (1) is provided with an impeller (5), and the impeller (5) is fixed on the inner wall of the fluid pipeline (1) through a fixed shaft (6). An even number of magnet blocks is arranged on the impeller (5). (5) Under the impetus of the fluid, it can rotate freely around the fixed shaft (4); the outer surface of the fluid pipeline (1) is provided with a multi-turn metal coil (4), and the two ends of the coil (4) are connected to the energy harvesting circuit (7) connection, the winding length of the metal coil slightly exceeds the diameter of the impeller (5), which can make full use of the magnetic field change generated by the rotation of the impeller magnet, and the electric energy generated by the coil cutting the magnetic induction line is stored in the capacitor in the energy harvesting circuit through the wire; the shell (2) It is fixedly connected with the fluid pipeline (1), and there are two upper and lower bistable piezoelectric components (3) between the fluid pipeline (1) and the casing (2). The flexible piezoelectric element is MFC, and the two poles of the MFC are connected to The energy harvesting circuit is connected, and the piezoelectric component is fixedly installed on the boss of the housing. When the impeller rotates, the magnet block arranged on the periphery of the impeller (5) rotates accordingly to cause a change in the magnetic field, and the coil (4) cuts the magnetic induction line to generate current, and at the same time the bistable piezoelectric component switches between the first and second stable states, The MFC is deformed to generate electric energy; the front and rear interfaces of the fluid pipeline (1) are provided with threads, which can be tightly connected with external pipelines;

Further, the impeller (5) described in accompanying drawing 1 adjusts the length of the fixed shaft (6) by adjusting the tightening knob on the fixed shaft (6), so that the fixed shaft presses the two ends of the inner wall of the fluid pipeline, so that the impeller ( 5) It is fixed at the center position inside the fluid pipeline (1), and no hole is opened on the side wall of the fluid pipeline, which ensures the integrity of the pipeline.

As shown in Figure 2, the impeller (5) has an even number of magnetic blocks uniformly arranged along the outer circumference, and the directions of magnetic poles of adjacent magnet blocks are opposite.

Further, one bistable piezoelectric assembly (3) is provided at the upper and lower positions of the fluid pipeline, and the magnetic poles of the magnet blocks on the piezoelectric assembly are in the same direction, with N poles facing the impeller (5). When the impeller is excited by the fluid and starts to rotate, because the magnetic poles of the adjacent magnetic blocks are in opposite directions, the bistable piezoelectric component is constantly switched between the first stable state and the second stable state under the alternating action of attractive-repulsive magnetic force, and is attached to the substrate The MFC patch is deformed to generate electrical energy, and the electrical energy is stored in the energy harvesting circuit through the wire for use.

The working process of the present invention is: after the installation is completed, when the fluid starts to flow in the pipeline, the impeller (5) is driven by the fluid and starts to rotate. 4. The four magnet blocks arranged alternately in the direction of magnetic poles rotate accordingly, causing changes in the spatial magnetic field, and the induced current is generated in the metal coil (4) wound on the outer wall of the fluid pipeline (1) and stored in the energy harvesting circuit (7); at the same time The bistable piezoelectric component (3) is constantly switching between the first stable state and the second stable state under the action of the alternating magnetic force of attraction and repulsion, and the MFC patch attached to the substrate is deformed to generate electric energy into the trap. capable circuit (7). Using piezoelectric and electromagnetic power generation methods to complete energy recovery and utilization, the fluid flow rate can also continue to generate electricity, and the stored electric energy can be used to power low-power detection and monitoring sensors.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (4)

1. a kind of bistable state piezoelectricity-electromagnetic power generation apparatus using fluids within pipes kinetic energy, it is characterised in that：Structure includes：Stream Body pipeline (1), shell (2), bistable state piezoelectric element (3), coil (4), impeller assembly (5), fixed link (6), prisoner's energy circuit (7)；Interface is equipped with screw thread before and after the fluid line (1), can closely be connect with extraneous pipeline；Fluid line (1) is external Surface is additionally provided with multiturn wire coil (4), and coil (4) both sides are connect with prisoner's energy circuit (7)；The inside of the fluid line (1) Center is equipped with impeller (5), and impeller (5) is pressed on fluid line (1) inner wall by fixing axle (6), and impeller (5) is equipped with even Several magnet pieces, impeller (5) can be freely rotated under the promotion of fluid around fixing axle (4)；The shell (2) and fluid line (1) to be fixedly connected, upper and lower two bistable state piezoelectric elements (3), flexible piezoelectric are equipped between fluid line (1) and shell (2) Element is MFC, and MFC the two poles of the earth are connect with prisoner's energy circuit, and piezoelectric element is fixedly mounted on the boss of housing；The impeller (5) turns When dynamic, the magnet piece for being arranged on impeller (5) periphery rotates therewith and surrounding magnetic field is caused to change, and then make to be arranged on pipeline external Sensing electric current is generated in coil (4), i.e., is produced electricl energy by electromagnetic induction while bistable state piezoelectric element (3) is in magneticaction Under constantly switch between first and second stable state, the MFC on its substrate is forced to deform upon, utilize piezoelectric effect generate electricity Energy.

2. a kind of bistable state piezoelectricity-electromagnetic power generation apparatus using fluids within pipes kinetic energy according to claim 1, special Sign is：The impeller (5) tightens stud by adjusting in fixing axle (6), makes fixed shaft compression fluid line inner wall both ends, So as to which impeller (5) is fixed on fluid line (1) inner hub location, not in fluid line side-wall hole.

3. a kind of bistable state piezoelectricity-electromagnetic power generation apparatus using fluids within pipes kinetic energy according to claim 1, special Sign is：The impeller (5) has been evenly arranged even number magnetic patch along outer circumference, and adjacent magnets block magnetic pole arranged direction is opposite.

4. a kind of bistable state piezoelectricity-electromagnetic power generation apparatus using fluids within pipes kinetic energy according to claim 1, special Sign is：The bistable state piezoelectric element (3) is designed with piezoelectric element (3) in fluid line upper-lower position, on piezoelectric element (3) Magnet piece magnetic pole setting direction it is identical, i.e., the same magnetic pole of all magnet pieces is both facing to impeller axis direction (5).