CN105281603B - A generator cylinder using a piezoelectric cantilever beam structure - Google Patents

Abstract

The invention discloses a power generation cylinder adopting a piezoelectric cantilever beam structure to solve the problems of the current pneumatic piezoelectric power generation device with complex structure, low energy utilization rate and high noise. The invention includes two parts, a cylinder body and a piezoelectric power generation device, and the power generation device is connected with the rear end of the cylinder through a thread pair. The piezoelectric power generation device is composed of a cavity end cover, a power generation cavity, an edge fixed power generation component or a middle fixed power generation component. The power generation component is mechanically deformed under the impact of compressed air and unstable gas pressure, based on The piezoelectric effect generates electric energy, and resets under the restoring force of the metal substrate, and generates electric energy again based on the piezoelectric effect. The invention has technical advantages such as simple structure, high energy utilization rate, low noise and low cost, and can collect and organize the generated electric energy through a rectification energy storage circuit to supply energy for the nodes of the Internet of Things. The invention has broad application prospects in the field of pneumatic technology.

Description

A generator cylinder using a piezoelectric cantilever beam structure

technical field

The invention relates to a power generation cylinder adopting a piezoelectric cantilever beam structure, which belongs to the field of pneumatic technology.

Background technique

Pneumatic technology is an engineering technology that uses air compressors as the power source and compressed air as the working medium for energy and signal transmission. It is one of the important means to realize automatic production and industrial control. And other advantages are widely used in processing, manufacturing, automobile production and other fields. With the continuous development of pneumatic technology, people have higher and higher requirements for the intelligentization of pneumatic systems. The application of Internet of Things technology in pneumatic systems is one of the main ways to realize the intelligentization of pneumatic technology. At present, the Internet of Things nodes in the pneumatic system are usually composed of sensors and wireless communication modules. The power supply mode is generally powered by external circuits and batteries. Power supply by external circuits will make the power supply lines of the pneumatic system complicated, increasing the cost and difficulty of system maintenance; For power supply, there are problems such as large battery size, short service life, and frequent replacement. It is difficult to meet the continuous operation requirements of sensors and wireless communication modules. At the same time, batteries contain heavy metals, and improper disposal of used batteries will cause serious environmental pollution.

Due to the large energy of the pneumatic system itself, capturing the energy of the pneumatic system to supply energy for the nodes of the Internet of Things has a good development prospect. The existing Chinese utility model patent "Pneumatic Power Generation Device", the authorized announcement number is CN 201898457 U, and the authorized announcement date is 2011.07.13, discloses a pneumatic power generation device, including an inflatable device, a sealed container, a control device and a piezoelectric crystal. The device communicates with the airtight container and inflates the airtight container. The control device is connected with the airtight container. The control device is installed close to the piezoelectric crystal. The control device forms an airflow from the compressed air in the airtight container and transmits the force of the airflow to the piezoelectric crystal. The piezoelectric crystal converts mechanical energy into electrical energy for use by electrical appliances connected to the piezoelectric crystal. Chinese invention patent "A Piezoelectric Generating Device Excited Based on Jet Micro-Oscillator", the application publication number is CN 102594202 A, and the application publication date is 2012.07.18, which discloses a piezoelectric generating device based on jet micro-oscillator excitation. The device includes a housing, a bistable jet element, a first oscillation chamber, a second oscillation chamber and an output circuit; the first oscillation chamber and the second oscillation chamber are arranged symmetrically on the left and right sides of the bistable jet element; in the first oscillation chamber Diaphragms are respectively arranged on the second oscillation cavity and a piezoelectric sheet, and the air inlet of the bistable jet element communicates with the air outlet of the pneumatic equipment. Due to the wall attachment effect of the bistable jet element, the gas circulates repeatedly to form oscillating gas in the oscillating cavity on both sides. The oscillating air flow in the oscillating cavity drives the diaphragm on the chamber to vibrate, and the vibration of the diaphragm drives the vibration deformation of the piezoelectric sheet on it. Generate charge. The above-mentioned prior art has problems such as complex structure of the power generation device, large space occupation, and difficulty in realizing integration and miniaturization; at the same time, since the power generation device disclosed in the above-mentioned technical solution adopts airflow shock energy harvesting in an open environment, there is an energy utilization rate Low, high noise and other issues.

Contents of the invention

In order to solve the problems of the above-mentioned pneumatic piezoelectric power generation device with complex structure, low energy utilization rate and high noise, the present invention discloses a power generation cylinder adopting a piezoelectric cantilever beam structure.

The technical solution adopted in the present invention is: the power generation cylinder adopting the piezoelectric cantilever structure is composed of a cylinder and a piezoelectric power generation device; the cylinder is an ordinary cylinder, and the power generation cylinder adopting a piezoelectric cantilever structure The cylinder is composed of a cylinder and a piezoelectric power generation device. The central position of the rear end cover of the cylinder is provided with an internal thread one. Assemblies, one end of one side of the end cover of the cavity is provided with an external thread one, which is used for screwing connection with the internal thread one at the center of the rear end cover of the cylinder, so as to realize the fast connection between the cylinder and the piezoelectric power generation device. The outer thread one center of the end cover of the cavity is provided with a through hole, which is used to realize the gas circulation between the cylinder and the piezoelectric power generation device, and the other end of the end cover of the cavity is provided with an external thread two, which It is used to screw and connect with the internal thread two of the power generation cavity to realize the fast connection between the end cover of the cavity and the power generation cavity; the open end of the power generation cavity is provided with a second internal thread, which is used for The two external threads are screwed together, the inner center of the power generation cavity is provided with an internal cavity, the side wall of the internal cavity of the power generation cavity is provided with an internal thread three, and the inner bottom of the power generation cavity is provided with a wire hole.

The edge-fixed power generation component is composed of a threaded ring, a metal substrate and a piezoelectric sheet. The outer circumference of the threaded ring is provided with an external thread three, which is used to connect with the internal thread three provided on the inner cavity side wall of the power generation cavity. The side wall of the inner circumference of the threaded ring is provided with an annular groove to realize the installation and fixation of the metal substrate. The upper and lower planes are respectively glued to the piezoelectric sheet, and the piezoelectric sheet is bonded to the upper and lower planes of the metal substrate. The edge-fixed power generation components can be m, and m is a positive integer greater than or equal to 1. It is used to cooperate with the power generation cavity to realize the power generation process.

The intermediate fixed power generation assembly is composed of a fixed plate, screws, a square base plate and a piezoelectric element. The outer circumference of the fixed plate is provided with four external threads, which are used to connect with the three internal threads provided on the side wall of the inner cavity of the power generation cavity, and the fixed plate is provided with n square grooves, where n is greater than or equal to 1 is a positive integer, which is used to realize the installation of a square substrate, and the center of the fixed plate is provided with n threaded holes, and n is a positive integer greater than or equal to 1, which is used for screwing connection with a screw to realize the installation of a square substrate fixed, the fixed plate is provided with bosses for the setting of threaded holes, the fixed plate is provided with round holes for wires, which are used for the arrangement of piezoelectric element wires, and the screws are used to set The threaded holes of the square substrate are screwed together to realize the fixing of the square substrate. The square substrate is installed in the square groove provided on the fixing plate. One end of the square substrate is provided with a circular through hole for the installation and fixing of the square substrate. The piezoelectric element is bonded on the upper and lower planes of the square substrate, and the intermediate fixed power generation components can be p, where p is a positive integer greater than or equal to 1, and is used to cooperate with the power generation cavity to realize the power generation process.

The beneficial effects of the present invention are: the present invention can capture the kinetic energy of airflow impact and the pressure energy of compressed gas, and the power generation process is divided into three stages: power generation during the impact process, power generation during the gas pressure fluctuation process and reset power generation. In the stage of impact power generation, part of the gas flowing into the cylinder through the air hole of the rear end cover enters the piezoelectric power generation device through the through hole at one end of the end cover of the cavity, and the other part stays in the cylinder, and the airflow entering the power generation device directly impacts the metal substrate so that The piezoelectric sheet is deformed, thereby generating electric energy; during the gas pressure fluctuation power generation stage, as the amount of gas entering the cylinder increases, the compressed air pushes the piston to make the cylinder move normally. When the piston moves, unstable gas will be generated in the cylinder and the piezoelectric power generation device. Fluctuation, constantly exerting alternating force on the power generation component, causing it to produce repeated deformation, so that the piezoelectric sheet continues to output electric energy; reset the power generation process, the metal substrate is reset due to its own restoring force after deformation, and the reset process The metal base plate will produce a reciprocating vibration with gradually weakening amplitude, and the piezoelectric sheet will continue to output electric energy along with the vibration process of the metal base plate until the vibration stops, and the invention completes a cycle of power generation process. The invention has technical advantages such as simple structure, high energy utilization rate, low noise and low cost, and at the same time, the generated electric energy can be collected and sorted through the rectification energy storage circuit to supply energy for the nodes of the Internet of Things. The invention has broad application prospects in the field of pneumatic technology.

Description of drawings

Fig. 1 is a schematic diagram of the structure of a power generating cylinder that adopts a piezoelectric cantilever beam structure proposed by the present invention;

Fig. 2 shows a schematic structural view of the cylinder in a power generating cylinder that adopts a piezoelectric cantilever beam structure proposed by the present invention;

Fig. 3 is a cross-sectional view of a piezoelectric generating device in a generating cylinder that adopts a piezoelectric cantilever beam structure proposed by the present invention;

Fig. 4 shows a sectional view of a cavity end cover in a generator cylinder adopting a piezoelectric cantilever beam structure proposed by the present invention;

Fig. 5 is a cross-sectional view of a power generation cavity in a power generation cylinder using a piezoelectric cantilever beam structure proposed by the present invention;

Fig. 6 is a cross-sectional view of an edge-fixed power generation component in a power generation cylinder adopting a piezoelectric cantilever beam structure proposed by the present invention;

Fig. 7 is a side view of an edge-fixed power generation assembly in a power generation cylinder using a piezoelectric cantilever beam structure proposed by the present invention;

Fig. 8 is a cross-sectional view of an intermediate fixed power generation component in a power generation cylinder adopting a piezoelectric cantilever beam structure proposed by the present invention;

Fig. 9 is a side view of a middle fixed power generation component in a power generation cylinder using a piezoelectric cantilever beam structure proposed by the present invention.

detailed description

Specific implementation manner 1: This implementation manner will be described with reference to FIG. 1 to FIG. 7 .

This implementation mode provides a specific implementation scheme of a power generation cylinder adopting a piezoelectric cantilever beam structure. The power generating cylinder adopting piezoelectric cantilever beam structure is composed of a cylinder 1 and a piezoelectric generating device 2 .

The cylinder 1 can be a double-acting cylinder (MBB50-100 cylinder of SMC Company); the central position of the rear end cover of the cylinder 1 is provided with an internal thread 1-1; the piezoelectric generating device 2 includes a cavity end cover 2- 1. Power generation cavity 2-2, edge-fixed power generation components 2-3.

The end of one side of the cavity end cover 2-1 is provided with an external thread-2-1-2, which is used for screwing connection with the internal thread-1-1 at the center of the rear end cover of the cylinder 1, so as to realize the cylinder 1 Fastened connection with the piezoelectric generating device 2; the external thread-2-1-2 center of the cavity end cover 2-1 is provided with a through hole 2-1-1, which is used to realize the connection between the cylinder 1 and the piezoelectric generator. The gas circulation between the power generation devices 2; the other end of the cavity end cover 2-1 is provided with an external thread 2-1-3, which is used to connect with the internal thread 2-2 of the power generation cavity 2-2 2-1 is screwed together to realize the fast connection between the cavity end cover 2-1 and the power generation cavity 2-2.

The opening end of the power generation cavity 2-2 is provided with an internal thread 2-2-1, which is used for screwing connection with the external thread 2-1-3 of the cavity end cover 2-1; the power generation cavity 2-2 is provided with an internal cavity 2-2-2 at the center of the interior, which is used for the installation and arrangement of the edge-fixed power generation component 2-3; the side wall of the internal cavity 2-2-2 of the power generation cavity 2-2 is provided with Internal thread three 2-2-3, which is used for screwing connection with the external thread three 2-3-1-1 on the edge-fixed power generation component 2-3, so as to realize the fixation of the edge-fixed power generation component 2-3; power generation cavity The inner bottom of the body 2-2 is provided with a wire hole 2-2-4, which is used to lead out the wires of the edge-fixed power generation assembly 2-3.

The edge-fixed power generation component 2-3 is composed of a threaded ring 2-3-1, a metal substrate 2-3-2 and a piezoelectric sheet 2-3-3, and the outer circumference of the threaded ring 2-3-1 is provided with The external thread three 2-3-1-1 is used for screwing connection with the inner cavity 2-2-2 side wall of the power generation cavity 2-2, which is provided with the internal thread three 2-2-3; the threaded ring 2 -3-1 The inner peripheral side wall is provided with an annular groove 2-3-1-2 to realize the installation and fixation of the metal substrate 2-3-2; one end of the metal substrate 2-3-2 is installed on the threaded ring 2- 3-1 An annular groove 2-3-1-2 is provided at the center of the inner circumference, and is glued and connected with epoxy resin; the upper and lower planes of the metal substrate 2-3-2 are respectively connected to the piezoelectric sheet 2-3 -3 is glued and connected by epoxy resin; the piezoelectric sheet 2-3-3 is glued on the upper and lower planes of the metal substrate 2-3-2 by epoxy resin; the edge-fixed power generation component 2 -3 can be m, and m is a positive integer greater than or equal to 1, which is used to cooperate with the power generation cavity 2-2 to realize the power generation process.

The specific power generation principle of this embodiment: the airflow generated by pneumatic compressed air acts on the metal substrate 2-3-2 in the power generation component 2-3 to cause bending deformation, thereby exciting the piezoelectric sheet 2-3-3 to generate electric energy. The compressed air can push the piston to make the cylinder 1 work normally. During the movement of the cylinder 1, the internal volume of the cylinder 1 changes, which causes the compressed gas to fluctuate. This fluctuation characteristic can make the unsteady compressed air continuously generate electricity. The component 2-3 exerts an alternating force to make it deform repeatedly. This process effectively increases the waveform bandwidth and thus increases the power generation of the power generating component 2-3. The metal substrate 2-3-2 is reset under the action of its restoring force. During the reset process, the metal substrate 2-3-2 will generate a reciprocating vibration with a gradually weakening amplitude. During this process, the piezoelectric sheet 2-3-3 can sustain output power. The power generation process of a power generation cylinder adopting a piezoelectric cantilever beam structure proposed by the present invention can be divided into three stages: power generation during the impact process, power generation during the gas pressure fluctuation process and power generation during the reset process. The specific power generation process is as follows: In the impact power generation stage, the gas flowing in from the air hole of the rear end cover of the cylinder 1, part of it enters the piezoelectric power generation device 2 through the through hole 2-1-1 at the end of the end cover 2-1 of the cavity, and the other part Staying in the cylinder 1, the airflow entering the power generation device 2 directly hits the metal substrate 2-3-2 to deform the piezoelectric sheet 2-3-3, thereby generating electric energy; the gas pressure fluctuates during the power generation stage, as the gas volume entering the cylinder 1 The compressed air pushes the piston to make the cylinder 1 move normally. When the piston moves, unstable gas fluctuations will be generated in the cylinder 1 and the piezoelectric power generation device 2, and the alternating force is continuously applied to the power generation component 2-3, making it Repeated deformations are generated, so that the piezoelectric sheet 2-3-3 continues to output electric energy; in the reset power generation stage, the metal substrate 2-3-2 resets due to its own restoring force after deformation, and the metal substrate 2-3 -2 will produce a reciprocating vibration with gradually weakening amplitude, and the piezoelectric sheet 2-3-3 can continuously output electric energy along with the vibration process of the metal substrate 2-3-2 until the vibration stops, and the present invention completes a cycle of power generation process. Repeating the above working process can realize the continuous power generation of the present invention.

Specific Embodiment 2: This embodiment will be described with reference to FIG. 8 and FIG. 9 .

This embodiment provides another specific implementation of a generator cylinder using a piezoelectric cantilever beam structure. Its structural composition and connection method are the same as those in Embodiment 1, except that the piezoelectric power generation device 2 includes a cavity end cover 2-1, a power generation cavity 2-2, and an intermediate fixed power generation component 2-4. The intermediate fixed power generation assembly 2-4 is composed of a fixing plate 2-4-1, a screw 2-4-2, a square base plate 2-4-3 and a piezoelectric element 2-4-4. The outer circumference of the fixing plate 2-4-1 is provided with an external thread 4 2-4-1-1, which is used to connect with the inner cavity 2-2-2 of the power generation cavity 2-2 and the side wall is provided with an internal thread 3 2 -2-3 screw connection; the fixed plate 2-4-1 is provided with n square grooves 2-4-1-2, n is a positive integer greater than or equal to 1, which is used to realize the square substrate 2-4- 3; the central position of the fixed plate 2-4-1 is provided with n threaded holes 2-4-1-3, n is a positive integer greater than or equal to 1, which is used for screwing with the screw 2-4-2 joint connection to realize the fixing of the square base plate 2-4-3; the fixing plate 2-4-1 is provided with a boss 2-4-1-4 for the setting of the threaded hole 2-4-1-3; The fixed plate 2-4-1 is provided with a wire hole 2-4-1-5, which is used for the arrangement of the piezoelectric element 2-4-4 wires; the screw 2-4-2 is used for connecting with the fixed plate The threaded hole 2-4-1-3 provided at the center of 2-4-1 is screwed and connected to realize the fixation of the square base plate 2-4-3; the square base plate 2-4-3 is installed on the fixing plate 2- 4-1 is equipped with a square groove 2-4-1-2, and one end of the square substrate 2-4-3 is provided with a circular through hole 2-4-3-1, which is used for the square substrate 2-4-3 Installed and fixed; the piezoelectric element 2-4-4 is bonded to the upper and lower planes of the square substrate 2-4-3 by epoxy resin glue; the intermediate fixed power generation components 2-4 can be p, p It is a positive integer greater than or equal to 1, and is used to cooperate with the power generation cavity 2-2 to realize the power generation process.

The principle of power generation in this embodiment is the same as the principle of power generation in Embodiment 1.

Claims (3)

1. A power generation cylinder adopting a piezoelectric cantilever beam structure, characterized in that: the power generation cylinder adopting a piezoelectric cantilever beam structure is composed of a cylinder (1) and a piezoelectric power generation device (2); the cylinder ( 1) An internal thread one (1-1) is provided at the center of the rear end cover, and the piezoelectric power generation device (2) includes a cavity end cover (2-1), a power generation cavity (2-2), an edge-fixed The power generation component (2-3) or the intermediate fixed power generation component (2-4), the end of one side of the cavity end cover (2-1) is provided with an external thread one (2-1-2), which is used for It is screwed and connected with the inner thread one (1-1) at the center of the rear end cover of the cylinder (1) to realize the tight connection between the cylinder (1) and the piezoelectric power generation device (2), and the cavity end cover (2 -1) There is a through hole (2-1-1) at the center of the external thread one (2-1-2), which is used to realize the gas flow between the cylinder (1) and the piezoelectric generator (2), The other end of the cavity end cover (2-1) is provided with external thread two (2-1-3), which is used to connect with the internal thread two (2-2-2) of the power generation cavity (2-2). 1) Screw connection to realize the tight connection between the cavity end cover (2-1) and the power generation cavity (2-2), and the open end of the power generation cavity (2-2) is provided with two internal threads (2- 2-1), which is used for screwing connection with the external thread 2 (2-1-3) of the cavity end cover (2-1), and the inner center of the power generation cavity (2-2) is provided with an internal content cavity (2-2-2), the inner cavity (2-2-2) side wall of the power generation cavity (2-2) is provided with internal thread three (2-2-3), the power generation cavity (2-2 ) There is a wire hole (2-2-4) at the inner bottom. 2. A power generating cylinder using a piezoelectric cantilever beam structure according to claim 1, characterized in that: the edge-fixed power generating component (2-3) consists of a threaded ring (2-3-1), a metal substrate (2-3-2) and piezoelectric sheet (2-3-3), the outer circumference of the threaded ring (2-3-1) is provided with three external threads (2-3-1-1), for The side wall of the internal cavity (2-2-2) of the power generation cavity (2-2) is provided with an internal thread three (2-2-3) screwed connection, and the inner threaded ring (2-3-1) The circumferential side wall is provided with an annular groove (2-3-1-2) to realize the installation and fixation of the metal substrate (2-3-2), and one end of the metal substrate (2-3-2) is connected with the threaded ring (2 -3-1) The annular groove (2-3-1-2) provided on the side wall of the inner circumference is adhesively connected, and the upper and lower planes of the metal substrate (2-3-2) are respectively connected to the piezoelectric sheet (2 -3-3) Adhesive connection, the piezoelectric sheet (2-3-3) is bonded on the upper and lower planes of the metal substrate (2-3-2), and the edge-fixed power generation component (2-3 ) can be m, and m is a positive integer greater than or equal to 1, which is used to cooperate with the power generation cavity (2-2) to realize the power generation process. 3. A power generating cylinder using a piezoelectric cantilever beam structure according to claim 1, characterized in that: the intermediate fixed power generating assembly (2-4) consists of a fixing plate (2-4-1), a screw ( 2-4-2), a square substrate (2-4-3) and a piezoelectric element (2-4-4); the outer circumference of the fixed plate (2-4-1) is provided with four external threads (2- 4-1-1), which is used for screw-in connection with the internal cavity (2-2-2) side wall of the power generation cavity (2-2), and the internal thread three (2-2-3) is provided, and the fixed The plate (2-4-1) is provided with n square grooves (2-4-1-2), n is a positive integer greater than or equal to 1, which is used to realize the installation of the square base plate (2-4-3), so There are n threaded holes (2-4-1-3) at the center of the fixing plate (2-4-1), where n is a positive integer greater than or equal to 1, which is used for connecting with the screw (2-4-2) Screw-in connection to realize the fixation of the square base plate (2-4-3), said fixing plate (2-4-1) is provided with bosses (2-4-1-4) for threaded holes (2- 4-1-3), the fixed plate (2-4-1) is provided with a wire hole (2-4-1-5), which is used for the piezoelectric element (2-4-4) wire Arrangement, the screw (2-4-2) is used for screwing connection with the threaded hole (2-4-1-3) provided in the center of the fixing plate (2-4-1), so as to realize the square base plate (2 -4-3), the square base plate (2-4-3) is installed in the square groove (2-4-1-2) provided on the fixing plate (2-4-1), the square base plate ( 2-4-3) One end is provided with a circular through hole (2-4-3-1), which is used for the installation and fixing of the square substrate (2-4-3), and the piezoelectric element (2-4-4) Adhesive on the upper and lower planes of the square substrate (2-4-3), the middle fixed power generation components (2-4) can be p, p is a positive integer greater than or equal to 1, and is used to connect with the power generation cavity (2-2) cooperate to realize the power generation process.