A non-contact force-induced galloping piezoelectric fluid self-powered sensor

Abstract

The application relates to a non-contact force-induced galloping piezoelectric fluid self-powered sensor, belonging to the technical field of piezoelectric power generation. The non-contact force-induced galloping piezoelectric fluid self-powered sensor comprises a pipeline, a honeycomb aluminum core, a prism structure, a spring structure, a fixing structure, a piezoelectric multi-beam structure and an L-shaped connecting piece; the honeycomb aluminum core is fixed to the front end of the pipeline; the prism structure is fixedly connected with the spring structure and is fixed to the middle end of the pipeline through the fixing structure; and the piezoelectric multi-beam structure is fixedly connected to the inside of the prism structure through the L-shaped connecting piece. Advantages and features: the prism structure with the built-in piezoelectric multi-beam structure isolates the self-powered sensing device from the fluid environment; the air damping in the prism cavity is smaller than the fluid damping, so that the galloping piezoelectric fluid sensor has a smaller cutting speed; the piezoelectric multi-beam structure has clear division of labor; the vice-beam piezoelectric sheet serves as an energy collector to collect energy for power supply, the main-beam piezoelectric sheet serves as a sensor to collect and transmit information, and the vice-beam piezoelectric sheet provides energy for the main-beam piezoelectric sheet, so that the self-powered sensing technology is realized.

Description

Technical Field

[0001] This invention relates to a piezoelectric self-powered sensor, and more particularly to a non-contact force-induced galloping type piezoelectric self-powered sensor. Background Technology

[0002] In recent years, with the continuous expansion of social automation and the increasing penetration of wireless sensors in various automation fields, the issue of power supply for wireless sensors to maintain operation has become apparent. Common methods for powering wireless sensors in the market include wires, batteries, and radio frequency (RF) power. However, each of these methods has its own drawbacks: difficulty in adapting to harsh environments, challenges in battery replacement, and significant electromagnetic interference. Therefore, the market urgently needs a new type of self-powered sensing technology that eliminates the need for traditional power supplies, enables energy harvesting and utilization, has a long lifespan, and is energy-efficient and environmentally friendly.

[0003] This paper proposes a galloping piezoelectric self-powered sensor. Galloping is an unstable vibration of an elastic structure caused by internal turbulence and initial disturbance of a fluid. The galloping piezoelectric sensor is a device in which the prism vibrates perpendicular to the direction of fluid flow when fluid passes through it, thus becoming the vibration source. The vibration causes the piezoelectric layer inside the device to expand and contract with strain. This strain outputs electrical energy using the positive piezoelectric effect, thereby realizing the conversion of mechanical energy into electrical energy and then using the output electrical energy to infer the flow velocity. It has the characteristics of single degree of freedom and strong correlation between amplitude and flow velocity.

[0004] In view of the above conditions, this invention proposes a non-contact force-induced piezoelectric fluid self-powered sensor. This sensor employs a prismatic structure with a built-in piezoelectric multi-beam structure to isolate the self-powered sensing device from the fluid environment. The air damping within the prismatic cavity is less than the damping of the fluid, resulting in a smaller cut-in speed for the galloping piezoelectric fluid sensor. The piezoelectric multi-beam structure has a clear division of labor: the secondary beam piezoelectric element acts as an energy harvester to collect energy and provide power, while the main beam piezoelectric element acts as a sensor to collect and transmit information. The secondary beam piezoelectric element provides energy to the main beam piezoelectric element, thereby realizing self-powered sensing technology. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to solve the problem of continuous self-powering and information sensing of the galloping piezoelectric fluid self-powered sensor by adopting a prism structure with built-in non-contact piezoelectric multi-beam structure and a self-powered electronic control structure designed based on the piezoelectric multi-beam structure.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A non-contact force-induced galloping piezoelectric fluid self-powered sensor includes a pipe, a honeycomb aluminum core, a prism structure, a spring structure, a fixing structure, a piezoelectric multi-beam structure, and an L-shaped connector; the honeycomb aluminum core is fixed to the front end of the pipe; the prism structure is fixed to the spring structure and to the middle end of the pipe through a fixed connection with the fixing structure; the piezoelectric multi-beam structure is fixed to the inside of the prism structure through the L-shaped connector.

[0008] The prism structure includes a prism cover plate, a waterproof gasket, and a prism shell; the prism cover plate is fixed to the prism cavity by bolts and nuts; the waterproof gasket is placed between the prism cover plate and the prism cavity by the screw tightening force between the two.

[0009] The spring structure includes a spring, a spring connector, and a spring retainer; the spring is tightly connected to the spring connector and the spring retainer through grooves on the spring connector and the spring retainer.

[0010] The fixing structure includes a fixing baffle and a retaining spring; the fixing baffle is embedded in the groove at the middle end of the pipe, and the retaining spring is tightly located at the rear end of the fixing baffle for fixing.

[0011] The piezoelectric multi-beam structure includes piezoelectric sheet ①, piezoelectric sheet ②, piezoelectric sheet ③, a connecting plate, a long strip mass block, and a square mass block. One side of piezoelectric sheet ② is fixed to the middle of the connecting plate by bolts and nuts. Piezoelectric sheet ① and piezoelectric sheet ③ are fixed to both ends of the connecting plate in the same direction by bolts and nuts. The other side of piezoelectric sheet ① and piezoelectric sheet ③ is used to mount the square mass block by bolts and nuts. At the same time, the long strip mass block is mounted at the fixed point of piezoelectric sheet ② in the middle of the connecting plate. The mass of the square mass block and the long strip mass block can be adjusted.

[0012] The advantages of this invention are: the use of a prismatic structure with a built-in piezoelectric multi-beam structure isolates the self-powered sensing device from the fluid environment; the air damping inside the prismatic cavity is smaller than the damping of the fluid, resulting in a smaller cut-in speed for the galloping piezoelectric fluid sensor; the piezoelectric multi-beam structure has a clear division of labor, with the secondary beam piezoelectric sheet acting as an energy harvester to collect energy for power supply, the main beam piezoelectric sheet acting as a sensor to collect and transmit information, and the secondary beam piezoelectric sheet providing energy to the main beam piezoelectric sheet, thereby realizing self-powered sensing technology. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the invention and form part of this application. The illustrative examples and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention.

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the prism structure in the overall structure of the present invention;

[0016] Figure 3 This is a schematic diagram of the spring structure in the overall structure of the present invention;

[0017] Figure 4 This is a schematic diagram of the fixed structure in the overall structure of the present invention;

[0018] Figure 5 This is a schematic diagram of the piezoelectric multi-beam structure in the overall structure of the present invention;

[0019] Figure 6 This is a schematic diagram of the L-shaped connector in the overall structure of the present invention;

[0020] Figure 7 This is a schematic diagram of the motion process of one working cycle of the present invention;

[0021] Figure 8 This is a structural block diagram of the self-powered sensing principle of the present invention.

[0022] In the picture:

[0023] 1. Pipeline; 2. Honeycomb aluminum core; 3. Prismatic structure;

[0024] 4. Spring structure; 5. Fixed structure; 6. Piezoelectric multi-beam structure;

[0025] 7. L-shaped connector; 3-1. Prismatic cover plate; 3-2. Waterproof gasket;

[0026] 3-3. Prismatic shell; 4-1. Spring; 4-2. Spring connector;

[0027] 4-3. Spring fixing component; 5-1. Fixing baffle; 5-2. Snap ring;

[0028] 6-1. Piezoelectric element ①; 6-2. Piezoelectric element ②; 6-3. Piezoelectric element ③;

[0029] 6-4. Connecting plate; 6-5. Long strip mass block; 6-6. Square mass block. Detailed Implementation

[0030] The following description, in conjunction with the accompanying drawings, further illustrates the detailed content of the present invention and its specific embodiments.

[0031] See Figures 1 to 6As shown, a non-contact force-induced galloping piezoelectric fluid self-powered sensor includes a pipe (1), a honeycomb aluminum core (2), a prism structure (3), a spring structure (4), a fixing structure (5), a piezoelectric multi-beam structure (6), and an L-shaped connector (7); the honeycomb aluminum core (2) is fixed to the front end of the pipe (1) through the inner diameter difference of the pipe (1); the prism structure (3) is fixed to the spring structure (4) and fixed to the middle end of the pipe (1) through the fixing structure (5); the piezoelectric multi-beam structure (6) is fixed to the inside of the prism structure (3) through the L-shaped connector (7).

[0032] The prism structure (3) includes a prism cover plate (3-1), a waterproof gasket (3-2), and a prism shell (3-3); the prism cover plate (3-1) is fixed to the prism shell (3-3) by screws and nuts; the waterproof gasket (3-2), the prism cover plate (3-1), and the prism shell (3-3) are fixed together by bolts.

[0033] The spring structure (4) includes a spring (4-1), a spring connector (4-2), and a spring fixing member (4-3); the spring (4-1) is tightly connected to the spring connector (4-2) and the spring fixing member (4-3) through grooves on the spring connector (4-2) and the spring fixing member (4-3).

[0034] The fixing structure (5) includes a fixing baffle (5-1) and a retaining ring (5-2); the fixing baffle is embedded in the groove at the middle end of the pipe (1), and the retaining ring (5-2) is tightly located at the rear end of the fixing baffle (5-1) for fixing.

[0035] The piezoelectric multi-beam structure (6) includes piezoelectric sheet ① (6-1), piezoelectric sheet ② (6-2), piezoelectric sheet ③ (6-3), connecting plate (6-4), elongated mass block (6-5), and square mass block (6-6). The connecting plate (6-4) is fixed to the middle of one side of piezoelectric sheet ② (6-2) by bolts and nuts. Piezoelectric sheet ① (6-1) and piezoelectric sheet ③ (6-3) are fixed to the two ends of the connecting plate (6-4) in the same direction and parallel by bolts and nuts. The elongated mass block (6-5) is placed at the fixed point of piezoelectric sheet ② (6-2) in the middle of the connecting plate (6-4). At the same time, the square mass block (6-6) is placed on the other side of piezoelectric sheet ① (6-1) and piezoelectric sheet ③ (6-3) by bolts and nuts. The mass of the elongated mass block (6-5) and the square mass block (6-6) can be adjusted.

[0036] See Figure 7 As shown, the motion process of one working cycle of the present invention is as follows:

[0037] Under the action of continuous and uniform incoming flow, when the fluid passes through the prism structure (3), the prism structure (3) will generate a single degree of freedom vibration perpendicular to the direction of fluid flow; due to the fixation of the fixed structure (5), the prism structure (3) will undergo periodic, cyclic, forced coupling up and down vibration within the extension range of the spring structure (4); the vibration of the prism structure (3) causes the forced vibration of the built-in piezoelectric multi-beam structure (6); which in turn causes the piezoelectric layer to stretch and strain, which uses the piezoelectric positive effect to output electrical energy to the outside, and at the same time can undertake the responsibility of collecting and transmitting information.

[0038] See Figure 8 As shown, the working process of the self-powered sensing principle of the present invention is as follows: the piezoelectric sheet ① (6-1) and piezoelectric sheet ③ (6-3) of the secondary beam act as energy harvesters, which transmit the collected energy to the rectifier circuit for rectification and voltage regulation; then it is transmitted to the energy storage device for energy storage; there is an intermittent power supply control switch circuit at the lower end of the energy storage device as a judgment signal, and a circuit will be formed when the energy collected in the energy storage device is greater than a certain voltage; then the collected energy is transmitted to the amplifier circuit; the piezoelectric sheet ② (6-2) of the main beam acts as a sensor, which transmits the detected signal data to the external digital signal acquisition system through the amplifier circuit, completing one information transmission interaction with the outside world.

[0039] The present invention relates to a non-contact force-induced galloping piezoelectric self-powered sensor, which adopts a prism structure (3) with a built-in piezoelectric multi-beam structure (6) to isolate the self-powered sensing device from the fluid environment; the air damping in the prism cavity is smaller than the damping of the fluid, so that the galloping piezoelectric self-powered sensor has a smaller cut-in speed; the piezoelectric multi-beam structure (6) has a clear division of labor, the secondary beam piezoelectric plates (6-1, 6-3) act as energy harvesters to collect energy for power supply, the main beam piezoelectric plate (6-2) acts as a sensor to collect and transmit information, and the secondary beam piezoelectric plates (6-1, 6-3) provide energy to the main beam piezoelectric plate (6-2), thereby realizing the self-powered sensing technology.

Claims

1. A non-contact force-induced galloping piezoelectric fluid self-powered sensor, comprising a pipeline, a honeycomb aluminum core, a prism structure, a spring structure, a fixed structure, a piezoelectric multi-beam structure, and an L-shaped connector; the honeycomb aluminum core is fixed to the front end of the pipeline; the prism structure is fixedly connected with the spring structure and is fixed in the middle end of the pipeline through the fixed structure; the piezoelectric multi-beam structure is fixedly connected inside the prism structure through the L-shaped connector, forming a non-contact structure isolated from the fluid environment and the self-powered sensing device, and the air damping in the prism cavity is smaller than the fluid damping, so that the cutting speed of the sensor is smaller; wherein, The prismatic structure comprises a prismatic cover plate, a waterproof gasket and a prismatic shell, the prismatic cover plate is fixedly connected with the prismatic shell through a screw nut, the waterproof gasket, the prismatic cover plate and the prismatic shell are fixedly connected through a bolt series connection, the spring structure comprises a spring, a spring connecting piece and a spring fixing piece, the spring is tightly connected with the spring connecting piece and the spring fixing piece through a groove on the spring connecting piece and the spring fixing piece, the fixing structure comprises a fixing baffle and a clasp spring, the fixing baffle is embedded in a groove at the middle end of the pipeline, the clasp spring is tightly located at the rear end of the fixing baffle and is used for fixing, the piezoelectric multi-beam structure comprises three piezoelectric sheets, a connecting plate, a long strip mass block and a square mass block, one side of the piezoelectric sheet 2 is fixedly connected to the prismatic structure through an L-shaped connecting piece, the other side is fixedly connected to the connecting plate to form a main beam, the piezoelectric sheets 1 and 3 are fixedly connected to both ends of the connecting plate in the same direction to form symmetrical auxiliary beams, the square mass blocks are installed on the outer sides of the piezoelectric sheets 1 and 3, the long strip mass block is installed in the middle of the connecting plate, the piezoelectric multi-beam structure has clear division of labor, the auxiliary beam piezoelectric sheet captures energy to supply energy, the main beam piezoelectric sheet is responsible for sensing, and the auxiliary beam supplies energy for the main beam to realize self-powered sensing.

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